Neutron Absorbing Stainless Steel
NAS8R10

JISーUNSーDIN/ENー
Made by adding natural boron to austenitic stainless steel, NAS8R10 provides strong shielding action against neutrons for use in nuclear reactors. The primary application of NAS8R10 is storage racks for spent fuel. The continuous casting process results in minute amounts of boron dispersed throughout the structure. The elongation property is improved over conventional stainless steels. Nippon Yakin supplies this product in plate form.

Chemical Composition	–
Product shape	Plate
Applications	Spent fuel storage racks, Spent fuel storage casks, Neutron shielding.

NASNi201 (UNS N02201)
High Corrosion Resistant Pure Nickel

Pure Nickel (NASNi201) offers excellent corrosion resistance against caustic soda, chlorine gas, etc. In particular, it is used as a material for caustic soda manufacturing equipment by diaphragm electrolysis method. Nippon Yakin supplies this product in plate, sheet, and strip form.

Chemical Composition	99Ni
Product shape	Coil	Sheet	Plate
Workability	Because the work hardenability of Pure Nickel is low, it is suitable for severe cold working by methods such as spinning and coining.
Weldability	Possible welding methods include shielded metal arc welding, TIG, MIG, and resistance welding. ENi-1 welding consumable should be used for TIG and MIG welding.

Grade/Standard

Chemical Composition

Mechanical Properties

Mechanical Properties at Room Temperature

Corrosion Resistance

Alkali Resistance

NASNM17
Nonmagnetic Soft Stainless Steel

NASNM17 is a high manganese austenitic stainless steel with a 17Cr-17Mn-7Ni composition. Nippon Yakin developed NASNM17 with improved workability by softening conventional nonmagnetic austenitic stainless steel. Nippon Yakin supplies this product in plate, sheet, and strip forms.

Chemical Composition	17Cr-17Mn-7.3Ni
Product shape	Coil	Sheet	Plate
Heat Treatment	Heat treatment of NASNM17 is similar to that of conventional austenitic stainless steels. Typical heat treatment conditions are as follows: Solution heat treatment: 1100~1150°C; rapid cooling.
Applications	Ornamental metal parts, Electronic components, Components in which a non-magnetic property is required.

Steel Grade/Standard

Chemical Composition

Physical Properties

Mechanical Properties

Mechanical Properties at Room Temperature

Work Hardening

Permeability

Relative permeability of the product will not change after the cold-working and will not be magnetized as well

NASNM15M
Non-Magnetic High-Strength Stainless Steel

Nippon Yakin developed NASNM15M, a high-manganese austenitic stainless steel, with a composition of 17Cr-15Mn-4Ni.A high-manganese austenitic stainless steel, NASNM15M was developed by Nippon Yakin with a composition of 17Cr-15Mn-4Ni. Providing higher strength than conventional non-magnetic austenitic stainless steels, NASNM15M does not magnetize even if cold worked with force. Nippon Yakin supplies this product in plate, sheet, and strip forms.

Chemical Composition	17Cr-15Mn-4Ni-0.3N
Product shape	Coil	Sheet	Plate
Workability	The hot and cold workability of NASNM15M is basically the same as that of standard austenitic stainless steels such as Type 304, Type 316, etc. However, it is important to consider that this is a high-strength material in both cold and hot working processes.
Heat Treatment	The heat treatment is similar to austenitic stainless steels. The typical heat treatment is as follows: Solution heat treatment: 1050~1150°C; rapid cooling.

Steel Grade/Standard

Chemical Composition

Physical Properties

Mechanical Properties

Mechanical Properties at Room Temperature

High Temperatures Strength

Work Hardening

Permeability

Age Hardening Behavior

Corrosion Resistance

Soft Magnetic Alloys
NASPC

NASPB
Soft Magnetic Material

NASPB is an Fe-Ni soft magnetic alloy with about 48% Ni. This alloy features high magnetic permeability and relatively high saturation magnetic flux density. Moreover, Nippon Yakin supplies NASPB in sheet and strip forms, making it ideal for applications requiring strong magnetic properties.

Chemical Makeup	48Ni-Fe
Product shape	Coil	Sheet	Plate
Applications	Current/voltage sensors, Electronic components, Magnetic shields.
Elemental Composition	48Ni-Fe

Chemical Composition

Physical Properties

Mechanical Properties

Mechanical Properties at Room Temperature

Work Hardening Properties

Softening Properties.

DC Magnetic Properties

AC Magnetic Properties

Effect of Magnetic Annealing Conditions on Magnetic Properties

Controlled Expansion Alloys
NAS21-6

Controlled Expansion Alloys

NAS36LG

JISー UNS K93600 DIN/ENー

Chemical Composition	36Ni-Fe
Product shape	Coil	Sheet
Low-temperature ductility	Because of its austenitic structure, the impact value does not vary, ensuring adequate ductility at room temperature and even extremely low temperatures.
Workability	Soft and extendible at room temperature, NAS36LG can be easily worked.

NAS36

Controlled Expansion Material
NAS36 is an alloy with nickel (36%) and iron as its main components. Because it has an extremely low coefficient of thermal expansion, approximately 1/10 that of 18-8 stainless steel, it can minimize thermal stress caused by temperature changes, eliminating the need for complex shapes (such as waves or bellows) that are required by other low-temperature materials.NAS36 also shows high toughness at low temperatures and provides excellent weldability. Nippon Yakin supplies NAS36 in plate, sheet, and strip forms.

Chemical Composition	36Ni-Fe
Product shape	Coil	Sheet	Plate
Weldability	NAS36 has good weldability. Joints of thin sheet materials can be welded by TIG welding without a filler, even in seam welding.
Applications	Molds for airplane body parts, Bimetals, Trimetals, Semiconductor manufacturing equipment.

Steel Grade/Standard

Nippon Yakin Grade	JIS	ASTM	EN
NAS36	—	—	—

Chemical Composition

C	Si	Mn	Ni	Fe
≦0.05	≦0.30	≦0.80	35.0~37.0	Bal.

Physical Properties

Density	[g/cm³]	8.14
Specific heat	[J/kg·K]	-196~20°C: 385
Electrical resistivity	[µΩ·cm at 20°C]	78
Thermal conductivity	[W/m·K at 20°C]	10.5
Thermal conductivity	[W/m·K at 50°C]	5.4
Average coefficient of thermal expansion	[10⁻⁶/°C 25~100°C]	1.5±0.5
Young’s modulus	[MPa]	14.5×10⁴
Curie point	[°C]	240~260
Melting range	[°C]	1415~1465

Coefficient of Thermal Expansion:

Mechanical Properties

Annealed Condition

Example	Thickness	Mechanical Properties
		0.2% proof stress [MPa]	Tensile strength [MPa]	Elongation [%]	Hardness
Hot-rolled plate	22mm	241	430	44	115 (HBW)
Cold-rolled sheet	1.3mm	292	477	37	132 (HV)

Weldability

NAS36 has good weldability. Joints of thin sheet materials can be welded by TIG welding without a filler, even in seam welding.

Applications

Molds for airplane body parts, Bimetals, Trimetals, Semiconductor manufacturing equipment.

 

NASXM-19 (UNS S20910)

High Strength, High Corrosion Resistance Stainless Steel
NASXM-19 is a nitrogen-strengthened austenitic stainless steel with excellent corrosion resistance. In comparison with Type 316L, NASXM-19 provides higher corrosion resistance and higher strength. Nippon Yakin supplies this product in plate, sheet, and strip forms.

Chemical Composition	21Cr-12Ni-5Mn-2Mo-0.2Nb-0.2V-0.3N
Product shape	Coil	Sheet	Plate
Workability	Hot and cold workability are substantially the same as other austenitic stainless steels. However, in both hot working and cold working, the fact that this is a high strength material must be considered.
Weldability	You can weld it using TIG, MIG, and shielded metal arc welding, just as you would with standard austenitic stainless steels. Frequently, use ER209 welding rods, which have the same composition.Not only are ER209 welding rods frequently used, **but they also** have the same composition.
Heat Treatment	Solution annealing of NASXM-19 is normally performed at the temperature range from 1065 to 1120°C followed by being quenched in water or rapidly cooled by other means.
Pickling	A mixture of nitric acid and fluoric acid is used in pickling. However, since descaling is more difficult compared to Type 304, first immerse the material in alkali before acid pickling, and, if possible, use shot blasting for better results.
Applications	Chemical plants, Spent nuclear fuel containers (casks).

Steel Grade/Standard

NAS630 (UNS S17400)
High Strength Stainless Steel

NAS630 is a precipitation hardening type of high strength stainless steel. It has excellent corrosion resistance equivalent to that of 18-8 austenitic stainless steels and also provides high strength equivalent to chromium stainless steels, which have a quench-hardening capacity. NAS630 is used in various parts where high strength is required, such as steel belts, high-strength mechanical parts, etc. Nippon Yakin supplies NAS630 in plate, sheet, and strip forms.

Chemical Composition	17Cr-4Ni-4Cu-0.2Nb
Product shape	Coil	Sheet	Plate
Heat Treatment	NAS630 is normally supplied in a solution treated condition. However, in order to obtain the maximum mechanical properties, it is necessary to perform H900 precipitation hardening heat treatment after working. If ductility is required, we recommend using H1150 precipitation hardening heat treatment. In this case, it is possible to perform precipitation hardening heat treatment of the base material, as working is also possible after precipitation hardening. Heat treatment conditions: H900 precipitation hardening: 470-490°C; air cooling H1150 precipitation hardening: 610-630°C; air cooling
Weldability	Welding of NAS630 can be performed using various welding methods in the same manner as with standard type austenitic stainless steels. Maximum welding efficiency can be obtained by performing normal solution treatment + H900 treatment after welding.
Pickling	In pickling of comparatively thick scale after solution treatment or hot working, the methods used with austenitic stainless steels can be used.
Applications	Springs, Press plates, Steel belts, Cutting blade.

NASHX (UNS N06002)
Heat-Resistant Nickel Alloy

NASHX (UNS N06002) is a nickel-chromium-iron-molybdenum alloy with outstanding strength and oxidation resistance in temperatures reaching as high as 1200°C. With superior workability and weldability as well, it is excellent for use in gas turbine members as well as various heating furnace parts. Nippon Yakin supplies this product in plate, sheet, and strip forms

Chemical Composition	47Ni-22Cr-9Mo-18Fe-1.5Co-0.6W
Product shape	Coil	Sheet	Plate
Workability	We recommend using a range of 982 to 1177°C for hot working NAS-HXK. You can easily cold work NAS-HXK, though it requires greater force compared to standard austenitic stainless steels. Apply solution treatment after working to achieve favorable creep properties.
Weldability	Such techniques as TIG, MIG, and shield metal arc welding can be used for NAS-HXK as with standard austenitic stainless steels. Cleanse the weld surface of oxidizing scales, oil, and dirt before welding.
Heat Treatment	The recommended solution heat treatment temperature is between 1149 and 1177°C, the range stipulated in SAE AMS 5536L. Rapidly cool after heat treatment to prevent the formation of precipitates.
Applications	Gas turbine parts, Furnace parts, Semiconductor manufacturing equipment.

Grade/Standard

NASH38X (UNS N08120)

Heat-Resistant Nickel Alloy

NASH38X (UNS N08120) is a high-nickel heat resistant alloy offering outstanding high-temperature strength and oxidation resistance. With a coarse grain structure controlled by high-temperature heat treatment and C, N, Nb components, NASH38X offers particularly high creep strength.

Nippon Yakin supplies NASH38X in plate form.

Chemical Composition	38Ni-25Cr-0.6Nb-0.2N
Product shape	Plate
Workability	Cold workability is equivalent to standard austenitic stainless steel.
Weldability	NAS-HX is weldable by TIG, MIG, and shielded arc welding processes. AWS A5.9 ER3856 welding electrodes are commonly used.
Heat Treatment	NAS-HX exhibits an austenite structure similar to austenitic stainless steel and is heat treated in the same way. Typical heat treatment is as follows: Solution treatment: 1177-1232°C; Rapid cooling.
Pickling	A mixture of nitric and fluoric acid is used in pickling.

Allowable Stress

Cyclic Oxidation Properties

Workability

Cold workability is equivalent to standard austenitic stainless steel.

Weldability

NASH38X is weldable by TIG, MIG, and shielded arc welding processes. AWS A5.9 ER3556 welding electrodes are commonly used.

Heat Treatment

NASH38X exhibits an austenite structure similar to austenitic stainless steel and is heat-treated in the same way. Typical heat treatment is as follows:

• Solution treatment: 1,177–1,232°C; Rapid cooling.

Pickling

A mixture of nitric and hydrofluoric acid is used in pickling.

Properties

NASH38X provides outstanding high-temperature strength, oxidation resistance, and carburization resistance, as well as excellent creep characteristics in temperatures of 800°C and above.

Applications

• Furnace parts
• Heat treatment fixtures

NAS601 (UNS N06601)
Heat-Resistant Nickel Alloy

NAS601 (NCF601, UNS N06601) is a nickel-chromium alloy with an addition of aluminum that provides high mechanical properties at elevated temperatures and superior resistance to oxidation, carburization, and sulfurization. It excels in descaling resistance during cyclic oxidation with high-temperature variations, making it ideal for use in various parts of heat treatment furnaces, diesel vehicle glow plugs, and similar applications. Nippon Yakin supplies this product in plate, sheet, and strip forms.

Chemical Composition	60Ni-23Cr-1Al-0.7Ti
Product shape	Coil	Sheet	Plate
Workability	Hot working is relatively easy with NAS601.For hot working, maintain the temperature between 1050°C and 1200°C, though light work can be done at temperatures as low as 850°C. Avoid the temperature range between 650°C and 850°C to prevent cracking. After hot working, we also recommend cooling through the temperature range of 500 to 800°C as fast as possible to avoid carbide precipitation. NAS601 has superior cold workability, similar to Type 310S and Alloy 800.
Weldability	Similar to standard austenitic stainless steels, weld NAS601 using techniques such as TIG, MIG, and shield metal arc welding. For edge preparation, mechanical cutting is desirable. Wide U and V groove angles should be used. Care should be taken to ensure its welding portion is clean as NAS601 is sensitive to surface contamination. AWS ERNiCrFe-11, AWS ERNiCrCoMo-3, AWS ENiCrFe-2, or AWS ENiCrFe-3 are commonly used.
Heat Treatment	NAS601 is non-hardenable by thermal treatment. Typical heat treatments are as follows: Annealing: 950°C minimum, rapid cooling. Solution treatment: 1100°C-1200°C, rapid cooling. For applications requiring high strength at elevated temperatures, solution treatment is recommended.
Applications	Heat treatment fixtures, Muffle furnace, Radiant tube, Chemical plants, Automobile glow plug.

Heat Resistance

Continuous Oxidation Properties

Cyclic Oxidation Properties

Cyclic oxidation properties for NAS601 are superior to Type 310S and Alloy 800H. This makes NAS601 optimal for use in environments subjected to repeated heating and cooling.

Workability

Hot working is relatively easy with NAS601. For hot working, temperatures should be between 1050 and 1200°C, although light work may be done at temperatures as low as 850°C. The temperature range between 650 and 850°C should be avoided as cracking may occur. After hot working, we also recommend cooling through the temperature range of 500 to 800°C as fast as possible to avoid carbide precipitation. NAS601 has superior cold workability, similar to Type 310S and Alloy 800.

Weldability

As with standard austenitic stainless steels, NAS601 may be welded using techniques such as TIG, MIG, and shield metal arc welding. For edge preparation, mechanical cutting is desirable. Wide U- and V-groove angles should be used. Care should be taken to ensure its welding portion is clean as NAS601 is sensitive to surface contamination. AWS ERNiCrFe-11, AWS ERNiCrCoMo-1, AWS ENiCrFe-2, or AWS ENiCrCoMo-1 are commonly used.

Heat Treatment

NAS601 is non-hardenable by thermal treatment. Typical heat treatments are as follows:

• Annealing: 950°C minimum, rapid cooling.
• Solution treatment: 1100°C–1200°C, rapid cooling.
  For applications requiring high strength at elevated temperatures, solution treatment is recommended.

Applications

• Heat treatment fixtures
• Muffe furnace
• Radiant tube
• Chemical plants
• Automobile glow plug

 

NAS600 (UNS N06600)
Heat-Resistant Nickel Alloy

NAS600 (NCF600, UNS N06600) is a nickel-chromium alloy that provides excellent resistance to oxidation at high temperatures. Nippon Yakin supplies this product in plate, sheet, and strip forms.

Chemical Composition	77Ni-16Cr-6Fe
Product Shape	Coil	Sheet	Plate
Workability	Hot working is relatively easy with NASH600. For hot working, the temperature should be between 1000°C and 1150°C, although light work may be done at 850°C. Cold workability is easier than austenitic stainless steels, similar to Monel.
Weldability	As with standard austenitic stainless steels, NASH600 may be welded using techniques such as TIG, MIG, and shield metal arc welding. For edge preparation, mechanical cutting is advisable.
Heat Treatment	The following heat treatments may be used: – Annealing: 800–150°C; Air or water cooling.
Machinability	As a high nickel alloy, NASH600 is not as machinable as an austenitic stainless steel. We may use a high-speed cutting tool, though we recommend a sintered carbide tool. The recommended feed speeds are as follows: – High-speed steel tool: 100–135m/min – Sintered carbide tool: 300–250m/min. -You should completely remove lubricants after machining before welding or heat treating.
Properties at High Temperatures	Engineers rely on NASH600 for its particularly superior oxidation resistance at high temperatures, which allows them to use it continuously in air and other environments for extended periods. Additionally, due to its excellent resistance to nitrogen, hydrogen, and carburization, engineers frequently use NASH600 in heat treatment furnaces. However, caution is necessary when dealing with chlorine and bromide, as these substances can cause damage. – Long-term continuous use in air oxidizing environment: 1100°C – Reducing environment of H2 or CO not containing sulfur: 1150°C – Excluding sulfur environment (in air containing sulfuric acid): 815°C – Reducing environment containing hydrogen sulfide: 535°C
Applications	Heat treatment fixtures, Muffle furnace, Chemical plants.

Grade/Standard

Mechanical Properties

Mechanical Properties at Room Temperature

High Temperature Strength

Workability

Hot working is relatively easy with NAS600. Operators should maintain temperatures between 1000 and 1180°C for hot working, although they can perform light work at temperatures as low as 850°C. However, they should avoid the range between 650 and 850°C, as cracking may occur. Cold workability is easier than austenitic stainless steels, similar to Monel.

Weldability

You can weld NAS600 using techniques such as TIG, MIG, and shielded metal arc welding, just like with standard austenitic stainless steels. For edge preparation, it is desirable to use mechanical cutting. Additionally, operators should use wide U- and V-groove angles.Care should be taken to ensure its welding portion is clean as NAS600 is sensitive to surface contamination.

Heat Treatment

You may use the following heat treatment:

• Annealing: 800-1150°C; Air or water cooling.
  Care should be taken at temperatures exceeding 1050°C as there is a strong tendency for the crystal grains to become coarse.

Machinability

As a high-nickel alloy, NAS600 is not as machinable as an austenitic stainless steel. A high-speed steel cutting tool may be used, though a sintered carbide tool is recommended. Also, the feed speed should be somewhat reduced, aiming for deep cutting. The recommended lathe feed speeds are as follows:

• High-speed steel tool: 1050-1350mm/min
• Sintered carbide tool: 3000-5250mm/min
  After machine work, lubricants should be completely removed before welding or heat treating.

Properties at High Temperatures

Exhibiting particularly superior oxidation resistance at high temperatures, NAS600 can be used in air as well as other environments continuously for long periods of time. Because it has excellent resistance to nitrogen, hydrogen, and carburization, NAS600 can be used in heat treatment furnaces. Care is needed with wet chlorine and bromide, however, as they will cause damage.

The maximum temperatures that NAS600 may be used in different environments are as follows:

• Long-term continuous use in air oxidizing environment: 1100°C
• Reducing environment of H₂ or CO not containing sulfur: 1150°C
• Oxidizing sulfur environment (in air containing sulfurous acid): 815°C
• Reducing environment containing hydrogen sulfide: 535°C
• Hydrogen chloride: 540°C
• Chlorine gas: 510°C

Applications

• Heat treatment fixtures
• Muffe furnace
• Chemical plants

NASH880
Heat Resistant Stainless Steel

NASH880 is an austenitic stainless steel developed by Nippon Yakin. It is suitable for use in high-grade sheathed heater tubes and provides excellent corrosion resistance in wet environments such as hot water supply devices. Nippon Yakin supplies NASH880 in sheet and strip forms.

Chemical Composition	25Ni-28.5Cr-1.2Mo-0.3Al-0.3Ti
Product Shape	Coil	Sheet
Weldability	NASH880 welded tube has good formability. There is no crack on the bead after several forming tests.
Blackening Property	Emissivity of NASH880 after blackening heat treatment is the same level as alloy 800 (Low C%).
Heat Treatment	Heat treatment of NASH880 can be performed in the same manner as with other austenitic stainless steels. The heat treatment temperature range is as follows:
	– Solution treatment: 1000–1100°C; water cooling.
Applications	Sheathed heater, Furnace parts.

Steel Grade/Standard

Nippon Yakin Grade	JIS	ASTM	EN
NASH880	—	—	—

Chemical Composition

	C	Si	Mn	P	S	Ni	Cr	Mo	Cu	Al	Ti	Co	N
Specification (NASH880)	≤0.030	0.30–0.50	0.35–0.65	≤0.025	≤0.015	24.50–27.00	22.80–23.90	1.15–1.35	≤0.25	0.20–0.40	0.25–0.45	0.05–1.00	≤0.02

Physical Properties

Density [g/cm³]	7.92
Specific heat [J/kg•K]	462
Electrical resistivity [μΩ•cm]	92.5
Thermal conductivity [W/m•K]	12.3
Average coefficient of thermal expansion [10⁻⁶/°C]	25–200°C 15.6
	25–400°C 16.4
	25–600°C 17.2
	25–800°C 18.0
Young’s modulus [MPa]	19.4 × 10⁴
Magnetism [μ]	None
Melting range [°C]	1380–1407

Mechanical Properties

Mechanical Properties at Room Temperature

	0.2% proof stress [MPa]	Tensile strength [MPa]	Elongation [%]
Specification (NASH880)	≥205	≥520	≥30
Example Cold-rolled sheet 0.5 mm	280	587	42

High Temperature Strength

Corrosion Resistance

1. Crevice Corrosion Resistance

Test condition:

• ① Multicreviece test piece
• ② Test temperature: 80°C
• ③ Test time: 24 hr

NaCl	5%	10%
alloy825	○	○
NASH880	×	×
alloy 800 (Low C%)	×	×

2. Stress Corrosion Cracking Resistance

Test condition:

• ① U-bend test piece
• ② Liquid solution: 10% NaCl
• ③ Test time: 74 hr

Temperature	180°C	200°C	220°C
alloy825	○	○	○
NASH880	×	×	×
alloy 800 (Low C%)	−	−	−

Weldability

NASH880 welded tube has good formability.

There is no crack on the bead after several forming tests.

Flaring test	Flattening test	180° Bending test (R=14mm)

Formability of NASH880 welded tubes (8mmφ × 0.5mm)

Blackening Property

Emissivity of NASH880 after blackening heat treatment is the same level as alloy 800 (Low C%).

Heat Treatment

Heat treatment of NASH880 can be performed in the same manner as with other austenitic stainless steels. The heat treatment temperature range which is normally used is as follows:

• Solution treatment: 1,000-1,100°C; water cooling.

Applications

• Sheathed heater
• Furnace parts.

NASH840
Heat Resistant Stainless Steel

NASH840 is an austenitic stainless steel with excellent oxidation resistance and high temperature corrosion resistance against chlorides. It is suitable for use in high-grade sheathed heater clad tubes. Nippon Yakin supplies NASH840 in sheet and strip forms.

Chemical Composition	19Ni-20Cr-0.4Ti-0.4Al
Product Shape	Coil	Sheet
Weldability	NASH840 has superior weldability. After plasma welding, no cracking occurred in the bending test or 30% tensile test.
Heat Treatment	Heat treatment of NASH840 can be performed in the same manner as with other austenitic stainless steels. The heat treatment temperature range is normally used as follows: – Solution treatment: 1030–1100°C; water cooling.
Applications	Sheathed heater, Furnace parts.

Corrosion Resistance

Weldability

NASH840 has superior weldability. After plasma welding, no cracking occurred in the bending test or 30% tensile test

Bending Test Specimens of NASH840 Plasma Welded Pipe 1. Face bending     2. Root bending   3. Tube expansion

30% Tensile Test of NASH840 Plasma Welded Pipe

Heat Treatment

Heat treatment of NASH840 can be performed in the same manner as with other austenitic stainless steels. The heat treatment temperature range which is normally used is as follows:
-Solution treatment: 1030-1100°C; water cooling.

Applications

• Sheathed heater
• Furnace parts.

Chemical Composition	[NAS800H]32Ni-20Cr-0.7Ti-0.2Al;
	[NAS800T]32Ni-20Cr-0.5Ti-0.5Al
Product shape	Coil	Sheet	Plate
Workability	Whether for hot working or cold working, NAS800H/800T offer workability similar to austenitic stainless steels.Operators should maintain temperatures between 1200 and 1230°C for hot working, although they can perform light work at temperatures as low as 850°C. To prevent cracks, we recommend avoiding the temperature range between 650 and 800°C. Although cold workability is similar to austenitic stainless steels, work hardening tends to be slightly lower.
Weldability	You can weld NAS800H/800T using techniques such as TIG, MIG, and shielded metal arc welding, just as with standard austenitic stainless steels. Welders often use AWS ERNiCr-3/AWS ENiCrFe-2 welding rods.
Heat Treatment	NAS800H/800T exhibit an austenitic structure similar to austenitic stainless steels, and appropriate heat treatment procedures and requirements are similar. Typical heat treatments are as follows: Solution treatment: 1100-1170°C; rapid cooling. For applications requiring creep rupture strength in high temperature environments, the following ASTM B409 heat treatment may be used: Solution treatment: 1121°C minimum (UNS N08810) 1149°C minimum (UNS N08811)
Properties at High Temperatures	Because of its high nickel and chromium content, NAS800H/800T resist oxidation and carburization at high temperatures. NAS800H/800T are superior to Type 310S and approach NAS800 in resistance to oxidation. Engineers widely use NAS800H/800T in applications requiring heat resistance due to their superior high-temperature strength, which is nearly equal to that of NAS800. These materials do not become brittle from sigma phase precipitation during use. While users generally apply NAS800 at temperatures below 600°C, they recommend NAS800H/800T for applicati requiring superior creep properties at higher temperatures
Corrosion resistance	NAS800H/800T offer superior corrosion resistance in oxidizing corrosive environments such as nitric acid or nitric acid sulfuric acid. Likewise, they perform well in sodium salt and other molten salt environments, with stress corrosion cracking resistance surpassing standard austenitic stainless steels.

Grade/Standards

Nippon Yakin Grade	JIS G 4902	ASTM B409	EN 10095
NAS800H	NCF800H	UNS N08810	—
NAS800T	—	UNS N08811	—

Chemical Composition

	C	Si	Mn	P	S	Ni	Cr	Cu	Al	Ti	Fe
Specification (NCF800H)	0.05–0.10	≤1.00	≤1.50	≤0.030	≤0.015	30.00–35.00	19.00–23.00	≤0.75	0.15–0.60	—	Bal.
Specification (UNS N08810)	0.05–0.10	≤1.0	≤1.5	—	≤0.015	30.00–35.00	19.00–23.00	≤0.75	0.15–0.60	—	≥39.5
Specification (UNS N08811)	0.06–0.10	≤1.5	—	≤0.015	—	30.00–35.00	19.00–23.00	≤0.75	0.15–0.60	—	≥39.5
Specification (EN 1.4876)	≤0.12	≤1.00	≤2.00	≤0.030	≤0.015	30.00–34.00	19.00–23.00	—	0.15–0.60	0.15–0.60	—

Physical Properties

Density [g/cm³]	8.03
Specific heat [J/kg•K]	460
Electrical resistivity [μΩ•cm]	99
Thermal conductivity [W/m•K]	12.6
Average coefficient of thermal expansion [10⁻⁶/°C]	25–200°C 15.9
	25–400°C 16.8
	25–600°C 17.3
	25–800°C 18.1
Young’s modulus [MPa]	19.7 × 10⁴
Curie point [°C]	−115
Magnetism [μ]	None
Melting range [°C]	1357–1385

Properties at High Temperatures

High-Temperature Strength

Creep Properties

Heat treatment	Temperature [°C]	Creep rupture strength [MPa]	Creep strength [MPa]
Solution treatment 1150°C	650	228	110
	704	162	54
	816	64	22
100hr	700	—	—
	1000hr	—	—
	10000hr	—	—

Workability

Whether for hot working or cold working, NAS800H/800T offer workability similar to austenitic stainless steels. For hot working, temperatures should be between 1000 and 1230°C, although light work may be done at temperatures as low as 850°C. To prevent cracks, we recommend avoiding the temperature range between 850 and 800°C. Although cold workability is similar to austenitic stainless steels, work hardening tends to be slightly lower.

Weldability

As with standard austenitic stainless steels, NAS800H/800T may be welded using techniques such as TIG, MIG, and shield metal arc welding. AWS ERNiCr-3/AWS ENiCrFe-2 welding rods are often used.

Heat Treatment

NAS800H/800T exhibit an austenite structure similar to austenitic stainless steels, and appropriate heat treatment procedures and requirements are similar. Typical heat treatments are as follows:

• Solution treatment: 1100-1170°C; rapid cooling.

For applications requiring creep rupture strength in high-temperature environments, the following ASTM B409 heat treatment may be used:

• Solution minimum: 1121°C minimum (UNS N08810)
• 1149°C minimum (UNS N08811)

Properties at High Temperatures

Because of its high nickel and chromium content, NAS800H/800T resist oxidation and carburization at high temperatures. NAS800H/800T are superior to Type 310S and approach NAS600 in resistance to oxidation. Offering superior high-temperature strength nearly equal to NAS600, NAS800H/800T are widely used in applications requiring heat resistance, as they do not become brittle due to sigma phase precipitation during use. While NAS800H is generally used at temperatures below 600°C, NAS800H/800T are recommended for applications requiring superior creep properties at higher temperatures.

Corrosion Resistance

NAS800H/800T offer superior corrosion resistance in oxidizing corrosive environments such as nitric acid or nitric acid-sulfuric acid. Likewise, they perform well in sodium salt and other molten salt environments, with stress corrosion cracking resistance surpassing standard austenitic stainless steels.

Applications

• Polyethylene production equipment
• Furnace parts
• Heat treatment fixtures
• Heat exchangers

NAS800 (UNS N08800)
Heat-Resistant Nickel Alloy

NAS800 (NCF800, UNS N08800) is a nickel-iron-chromium alloy that provides high strength and excellent resistance to oxidation and carburization at high temperatures. It also offers excellent corrosion resistance in many aqueous environments. Nippon Yakin provides this product in plate, sheet, and strip forms.

Chemical Composition	32Ni-20Cr-0.4Ti-0.3Al
Product shape	Coil	Sheet	Plate
Workability	Whether for hot working or cold working, NAS800 offers workability similar to austenitic stainless steels. Operators should maintain temperatures between 1200 and 1230°C for hot working, although they may perform light work at temperatures as low as 850°C To prevent cracks, we recommend avoiding the temperature range between 650 and 800°C. Although cold workability is similar to austenitic stainless steels, work hardening tends to be slightly lower.
Weldability	You can weld NAS800 using techniques such as TIG, MIG, and shielded metal arc welding, just as with standard austenitic stainless steels. Welders often use AWS ERNiCr-3/AWS ENiCrFe-2 welding rods.
Heat Treatment	NAS800 exhibits an austenitic structure similar to austenitic stainless steels, and appropriate heat treatment procedures and requirements are similar. Typical heat treatments are as follows: Annealing 980-1060°C; rapid cooling.
Properties at High Temperatures	Because of its high nickel and chromium content, NAS800 resists oxidation and carburization at high temperatures. NAS800 is superior to Type 310S and approaches NAS800 in resistance to oxidation. Engineers widely use NAS800 in applications requiring heat resistance due to its superior high-temperature strength, which is nearly equal to that of NAS800. It does not become brittle from sigma phase precipitation during use. While users generally apply NAS800 at temperatures below 600°C, they recommend NAS800H/800T for applications that require superior creep properties at higher temperatures.
Corrosion resistance	NAS800 offers superior corrosion resistance in oxidizing corrosive environments such as nitric acid or nitric acid sulfuric acid. Likewise, it performs well in sodium salt and other molten salt environments, with stress corrosion cracking resistance surpassing standard austenitic stainless steels.

Grade/Standard

High Temperature Strength

Workability

Whether for hot working or cold working, NAS800 offers workability similar to austenitic stainless steels. For hot working, temperatures should be between 1000 and 1230°C, although light work may be done at temperatures as low as 650°C. To prevent cracks, we recommend avoiding the temperature range between 650 and 800°C. Although cold workability is similar to austenitic stainless steels, work hardening tends to be slightly lower.

Weldability

As with standard austenitic stainless steels, NAS800 may be welded using techniques such as TIG, MIG, and shield metal arc welding. AWS ERNiCr-3/AWS ENiCrFe-2 welding rods are often used.

Heat Treatment

NAS800 exhibits an austenite structure similar to austenitic stainless steels, and appropriate heat treatment procedures and requirements are similar. Typical heat treatments are as follows:

• Annealing: 980-1060°C; rapid cooling.

Properties at High Temperatures

Because of its high nickel and chromium content, NAS800 resists oxidation and carburization at high temperatures. NAS800 is superior to Type 310S and approaches NAS600 in resistance to oxidation. Offering superior high-temperature strength nearly equal to NAS600, NAS800 is widely used in applications requiring heat resistance, as it does not become brittle due to sigma phase precipitation during use. While NAS800 is generally used at temperatures below 600°C, NAS800H/800T are recommended for applications requiring superior creep properties at higher temperatures.

Corrosion Resistance

NAS800 offers superior corrosion resistance in oxidizing corrosive environments such as nitric acid or nitric acid-sulfuric acid. Likewise, it performs well in sodium salt and other molten salt environments, with stress corrosion cracking resistance surpassing standard austenitic stainless steels.

Applications

• Sheathed heater
• Furnace parts
• Heat treatment fixtures
• Heat exchangers

NASH330 (UNS N08330)
Heat-Resistant Nickel Alloy

NASH330 is a heat-resistant nickel alloy with excellent high-temperature strength, corrosion resistance, and metallurgical stability. In particular, it provides superior resistance to carburization and nitridation. Because it has a fully austenitic microstructure, it displays good workability. Nippon Yakin supplies NASH330 in plate, sheet, and strip forms.

Chemical Composition	33Ni-18Cr-1.2Si
Product shape	Coil	Sheet	Plate
Workability	The hot workability and cold workability of NAS-H330 are similar to those of conventional austenitic stainless steels. For hot working, a starting temperature of 1230°C and finishing temperature of 850°C are suitable. Cold workability is similar to that of conventional austenitic stainless steels. Work hardening tends to be slightly lower. Bending, drawing, and similar working are possible.
Weldability	NAS-H330 can be welded by TIG, MIG, and shield metal arc welding in the same manner as with conventional standard austenitic stainless steels. Manufacturers frequently use AWS ERNiCr-3 welding electrodes.
Heat Treatment	Heat treatment of NAS-H330 is similar to that of conventional austenitic stainless steels. The typical heat treatment is as follows: Solution heat treatment: 1040-1120°C.The solution heat treatment process performs carbide dissolution and strain removal.
Pickling	Pickling is performed with a nitric hydrofluoric acid solution or aqua regia solution (nitric hydrofluoric acid solution) in the same manner as with standard austenitic stainless steels.
Features	NAS-H330 is used mainly in high temperature carburizing or nitriding atmospheres. It is most suitable for application in the 815-1150°C temperature range.

Steel Grade/Standard

Work Hardening Property

High Temperature Strength

Allowable Stress

Workability

The hot workability and cold workability of NASH330 are similar to those of conventional austenitic stainless steels. For hot working, a starting temperature of 1230°C and finishing temperature of 980°C are suitable. Cold workability is similar to that of conventional austenitic stainless steels. Work hardening tends to be slightly lower. Bending, drawing, and similar working are possible.

Weldability

You can weld NASH330 using TIG, MIG, and shielded metal arc welding, just as you do with conventional standard austenitic stainless steels. Manufacturers frequently use AWS ERNiCr-3 welding electrodes.

Heat Treatment

Heat treatment of NASH330 is similar to that of conventional austenitic stainless steels. The typical heat treatment is as follows:
Solution heat treatment: 1040–1120°C
Carbide dissolution and strain removal are performed in the above solution heat treatment.

Pickling

Pickling is performed with a nitric-hydrofluoric acid solution or aqua regia solution (nitric-hydrochloric acid solution) in the same manner as with standard austenitic stainless steels.

Features

NASH330 is used mainly in high-temperature carburizing or nitriding atmospheres. It is most suitable for application in the 815–1150°C temperature range.

Applications

Furnace parts, Heat treatment fixtures, Carbonization furnace components.

NASNW400 (UNS N04400)
High Corrosion Resistant Ni-Cu Alloy

NASNW400 (NW4000, UNS N04400), with a composition comprising Ni and Cu, is an alloy which provides a combination of the noble metal properties of Cu and the passivation property of Ni and offers excellent corrosion resistance. Taking advantage of these properties, it is used in seawater desalination plants, heat exchangers, overlay materials for marine structures, and similar applications. Nippon Yakin supplies this product in plate, sheet, and strip form.

Chemical Composition	65Ni-32Cu-1Fe
Product shape	Coil	Sheet	Plate
Workability	Because ordinary temperature strength of NASNW400 is lower than that of Type 304, the cold working such as bending is easier than Type 304.
Weldability	Possible welding methods include shielded metal arc welding, TIG, MIG, and resistance welding. ENiCu-7 welding consumable should be used for TIG and MIG welding.
Heat Treatment	Solution annealing of NASNW400 is normally performed at the temperature range from 700 to 900°C followed by being quenched in water or rapidly cooled by other means.
Pickling	It should be noted that descaling of NASNW400 is somewhat difficult in comparison with Type 304.
Applications	Chemical plants, Fluorine-related equipment, Oil and gas extraction, Heat exchangers, Sacrificial anode.

Grade/Standard

Nippon Yakin Grade	JIS G 4902	ASTM B127	EN
NASNW400	NW4400	UNS N04400	—

Chemical Composition

	C	Si	Mn	P	S	Ni	Cu	Fe
Specification (NW4400)	≤0.30	≤0.50	≤2.00	≤0.024	≤0.020	≥63.00	28.00-34.00	≤2.50
Specification (UNS N04400)	≤0.3	≤0.5	≤2.0	≤0.024	≤0.02	≥63.0	28.00-34.0	≤2.5

Physical Properties

Density	g/cm³	8.8
Specific heat	J/kg·K	424 (at 20°C)
Electrical resistivity	µΩ·cm	54.7
Thermal conductivity	W/m·K	23.9
Average coefficient of thermal expansion 10⁻⁶/°C	20~100°C	13.6
	20~200°C	14.1
	20~300°C	14.6
	20~400°C	15
Young’s modulus	MPa	17.8 × 10⁴
Melting range	°C	1300~1350

Mechanical Properties

Mechanical Properties at Room Temperature

			0.2% Proof Stress (MPa)	Tensile Strength (MPa)	Elongation (%)	Hardness (HV)
Specification (NW4400)	Annealing		≥195	≥485	≥35	—
Specification (UNS N04400)	Annealing	Hot-rolled plate	≥195	≥485	≥35
		Cold-rolled sheet	≥195	485~585	≥35
Example	Annealing	Hot-rolled plate (12mm)	209	513	52	131

Work Hardening

Because work hardening of NASNW400 is substantially smaller than that of Type 301 and Type 304, bending forming and similar working can be performed easily.

Corrosion Resistance

 

Acid Resistance

Alloy	5%	10%	20%	40%	60%	80%
SUS316L	1.67	4.69	71.91	764.0	704.5	33.74
NAS64	<0.01	0.02	1.07	191.9	1054	60.72
NAS254N	0.02	0.05	1.02	2.11	2.16	7.76
NASNW400	0.28	0.27	0.20	0.16	0.14	0.80

Test time: 24h

Corrosion rate in boiling sulfuric acid (mm/y)

Alloy	5%	10%	20%	40%
SUS316L	8.19	24.61	178.9	3129
NAS64	0.35	1.65	17.68	3829
NAS254N	1.17	3.30	7.90	24.65
NASNW400	0.21	0.36	0.53	1.23

Test time: 24h

Corrosion rate in hydrochloric acid at 80°C (mm/y)

Alloy	0.1%	1%	2%	3%
SUS316L	0.91	2.73	6.75	14.98
NAS64	0.01	0.01	12.94	30.51
NAS254N	0.01	0.02	0.01	0.09
NASNW400	0.34	0.40	0.46	1.63

Test time: 24h

Corrosion rate in boiling formic acid (mm/y)

Alloy	20%	40%	60%	80%
SUS316L	0.15	0.49	0.70	1.22
NAS64	0.04	0.11	0.23	0.30
NAS254N	0.01	0.05	0.08	0.10
NASNW400	0.05	0.08	0.15	0.20

Test time: 24h

Reference

Alloy	JIS	UNS No.	Chemical Composition
SUS316L	SUS316L	S31603	17Cr-12Ni-2Mo
NAS64	SUS329J4L	S32506	25Cr-6.5Ni-3.3Mo-0.17N
NAS254N	SUS836L	S32603	23Cr-25Ni-5.5Mo-0.2N
NASNW400	NW4400	N04400	66Ni-32Cu-1Fe

Workability

Because ordinary temperature strength of NASNW400 is lower than that of Type 304, the cold working such as bending is easier than Type 304.

Weldability

Possible welding methods include shielded metal arc welding, TIG, MIG, and resistance welding. ENiCu-7 welding consumable should be used for TIG and MIG welding.

Heat Treatment

Solution annealing of NASNW400 is normally performed at the temperature range from 700 to 900°C followed by being quenched in water or rapidly cooled by other means.

Pickling

It should be noted that descaling of NASNW400 is somewhat difficult in comparison with Type 304.

Applications

Chemical plants, Fluorine-related equipment, Oil and gas extraction, Heat exchangers, Sacrificial anode.

Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model : NASNW276

NASNW276 (UNS N10276)
High Corrosion Resistant Nickel Alloy

NASNW276 is a Ni-Cr-Mo alloy with excellent corrosion resistance in both oxidizing and reducing atmospheres.In this alloy, reducing the contents of C and Si suppresses carbide precipitation in the heat-affected zone (HAZ) and improves corrosion resistance. Based on these features, industries widely use NASNW276 in materials subjected to severe environments, such as chemical plants. Nippon Yakin supplies this product in plate, sheet, and strip forms.

In this alloy, reducing the contents of C and Si suppresses carbide precipitation in the heat-affected zone (HAZ) and improves corrosion resistance. Based on these features, industries widely use NASNW276 in materials subjected to severe environments, such as chemical plants.

Chemical Composition	59Ni 15Cr 16Mo 4W 5Fe
Product shape	Coil	Sheet	Plate
Workability	High-temperature strength is higher than Type 304. Cold workability is similar to standard austenitic stainless steels like Type 304, 316, etc. You must consider the high strength of the material in cold working.
Weldability	Ordinary welding methods can be used. Matching welding consumables should be used. You do not need to perform post-weld heat treatment.
Heat Treatment	Solution annealing at 1150–1170°C, followed by quenching in water or rapid cooling.
Pickling	Nitric acid and hydrofluoric acid used in pickling. You will find descaling more difficult compared to Type 304.. Alkaline immersion before pickling and shot blasting are effective.
Applications	Chemical plants, Flue gas desulfurization plants, Oil and gas extraction, Heat exchangers.
Chemical Composition	59Ni 15Cr 16Mo 4W 5Fe

Grade/Standard

Chemical Composition	57Ni 21Cr 14Mo 3W 4Fe
Product shape	Coil	Sheet	Plate
Workability	High-temperature strength is higher than Type 304, requiring care when hot working. Cold workability similar to standard austenitic stainless steels like Type 304, 316, etc. When performing cold work, consider the high strength of the material.
Weldability	Ordinary welding methods can be used with stainless steels. Matching welding consumables should be used. You do not need to perform post-weld heat treatment.
Heat Treatment	Solution annealing at 1150–1170°C, followed by quenching in water or rapid cooling.
Pickling	Nitric acid and hydrofluoric acid used in pickling.Descaling is more challenging compared to Type 304, so it’s essential to proactively implement stronger techniques such as alkaline immersion before pickling or shot blasting to improve efficiency.Alkaline immersion before pickling and shot blasting are effective.
Applications	Chemical plants, Pharmaceutical plants, Environment-related equipment, Heat exchangers.
Chemical Composition	57Ni 21Cr 14Mo 3W 4Fe

Mechanical Properties

NAS625 (UNS N06625)
Corrosion-Resistant and Heat-Resistant Nickel Alloy

NAS625 (NCF625, UNS N06625) is a nickel-chromium-molybdenum alloy with an addition of niobium. Matrix stiffening provided by molybdenum and niobium results in high strength. The alloy resists a wide range of severe corrosion environments. It also offers resistance to high temperatures.  Uses include parts in chemical and garbage incinerator plants. Nippon Yakin supplies this product in plate, sheet, and strip forms.

Chemical Composition	62Ni 22Cr 9Mo 3.7Nb 0.71Ti 0.24Al
Product shape	Coil	Sheet	Plate
Workability	High-temperature strength is much higher than Type 304. Care needed when hot working. Cold workability is similar to standard austenitic stainless steels like Type 304, 316, 316, etc. The high strength needs to be considered in cold working.
Weldability	Shielded metal arc welding, TIG welding, plasma welding are possible. Susceptibility to solidification cracking is higher than Type 304.
Heat Treatment	Solution annealing at 871°C, followed by quenching in water or rapid cooling. For higher temperature annealing, 1030°C followed by rapid quenching.
Pickling	Nitric acid and hydrofluoric acid used in pickling. Descaling more difficult than Type 304, requires alkaline immersion before pickling, blasting also effective.
Applications	Chemical plants, Environment-related equipment, Oil and gas extraction.
Chemical Composition	62Ni 22Cr 9Mo 3.7Nb 0.71Ti 0.24Al

NAS825 (UNS N08825)
High Corrosion Resistant Nickel Alloy

NAS825 (NCF825, UNS N08825) is a high-Ni nickel alloy with high corrosion resistance, and possesses extremely high corrosion resistance against oxidizing and non-oxidizing acids. Nippon Yakin supplies this product in plate, sheet and strip form.

Chemical Composition	40Ni 23Cr 3Mo 2Cu 0.71Ti
Product shape	Coil	Sheet	Plate
Workability	Cold and hot workability approximately equal to Type 304, 316, and other standard austenitic stainless steels.
Weldability	Shielded metal arc welding, TIG welding, MIG welding are possible. Use Alloy 625, CNiCrMo-3 welding consumables.
Machinability	Machinability equivalent to standard austenitic stainless steels. Use high-speed steel tool or super-hard tool, slow feed speed, and large cut depth are advised.
Heat Treatment	Solution annealing at 930–1030°C, followed by quenching in water or rapidly cooling.
Pickling	Nitric acid and hydrofluoric acid are used. High corrosion resistance of NAS625 makes scale removal difficult. Alkaline solution immersion before pickling recommended.
Applications	Chemical plants, Oil and gas extraction, Sheathed heater, Umbilical cable.

NAS75N (UNS S32760)
High Corrosion Resistant Super Duplex Stainless Steel

NAS75N is a super duplex stainless steel with a pitting resistance equivalent (PRE*) number of more than 40, and provides excellent corrosion resistance and strength properties. In comparison with UNS S32205, SUS329J3L, and SUS329J4L (NAS64), it offers superior localized corrosion resistance, and thus is suitable for use in chemical plants, seawater desalination plants, and similar severe environments. Nippon Yakin supplies this product in plate form.

Chemical Composition	25Cr 7Ni 3.8Mo 0.6Cu 0.6W 0.27N
Product shape	Coil	Sheet	Plate
Workability	The high-temperature strength of NAST57N is basically the same as Type 430 in the range of 950–1150°C. Strength decreases sharply below 900°C. Hot working can lead to microstructural changes, such as grain distortion or phase segregation. Solution annealing allows the metal to achieve a uniform microstructure by dissolving unwanted phases or segregations. Low workability due to proof stress and elongation compared to Type 304.
Weldability	Various welding methods (shielded metal arc welding, TIG welding, plasma welding). Use welding electrodes for UNS S32760. Preheating and post-heating not necessary. Interpass temperature ≤100°C to prevent intermetallic compound formation.
Heat Treatment	Solution annealing at 1200°C, quenched in water or rapidly cooled by other means. Conditions per ASTM A480/A480M.
Pickling	Mixture of nitric acid and hydrofluoric acid is used in pickling. Descaling Type 304 stainless steel is difficult due to its strong corrosion resistance and oxide layers. It requires more aggressive methods, such as stronger chemicals or mechanical processes. Pickling requires alkaline immersion before, and blasting is very effective.
Applications	Seawater desalination plant, Chemical plant, Seawater pump.
Certification	Manufactured to UNS S32760 according to NORSOK standard. Thickness up to 40mm. NORSOK M 650, NORSOK M 630 MDS D55.

NAS74N (UNS S32750)
High Corrosion Resistant Super Duplex Stainless Steel

NAS74N is a super duplex stainless steel with a pitting resistance equivalent (PRE*) number higher than 40, which provides not only excellent corrosion resistance but also excellent strength properties. In particular, NAS74N has superior localized corrosion resistance compared with UNS S32205 (NAS329J3L, SUS329J3L), and UNS S32506 (NAS64, SUS329J4L). Therefore, industries utilize NAS74N for applications in severe environments, including chemical plants and desalination facilities, due to its superior corrosion resistance and mechanical properties Nippon Yakin supplies NAS74N in the form of plate, sheet, and strip.

*PRE = %Cr + 3.3 × %Mo + 16 × %N

Chemical Composition	25Cr, 7Ni, 3.8Mo, 0.27N
Product Shape	Coil	Sheet	Plate
Workability	Attention should be paid to the strength behavior of NASTM which increases below 1000°C despite lower strength than Type 304 at high temperatures. Solution annealing is necessary after hot working.
Weldability	Conventional welding processes including GTAW (TIG), GMAW (MIG) can be used. Use filler metals for UNS S32750. It is advisable to avoid preheating when working with NAS74N, as it may lead to undesirable effects on the material’s properties.
Heat Treatment	Solution annealing of NASTM should be performed between 1025°C to 1125°C, followed by quick quenching to prevent brittleness.
Pickling	We apply a mixture of nitric and fluoric acids for pickling to effectively remove surface contaminants and enhance the material’s corrosion resistanceImmersion in fused salt before pickling is effective.
Applications	Seawater desalination plant, Environment-related equipment, Chemical plants, Seawater pump.
Certification	Can be manufactured to UNS S32750 in accordance with the NORSOK standard. Thickness up to 40mm.

Steel Grade/Standard

Chemical Composition

Physical Properties

Mechanical Properties at Room Temperature

**EN 10088-2 hot rolled plate

Impact Value

Corrosion Resistance

NAS74N has excellent localized corrosion resistance (pitting corrosion, crevice corrosion) and acid resistance in comparison with Type 304, Type 316L, NAS329J3L (UNS S32205), NAS64 (UNS S32506).

Pitting Corrosion Resistance

Test conditions: ASTM G48 Method A (O: No pitting corrosion, ×: Pitting corrosion)

Test solution: 6%FeCl₃
Test temperature: 22°C, 50°C (Recommended temperature in this test)
Test time: 72h

Crevice Corrosion Resistance

Test conditions: ASTM G48 Method D
Test solution: 6%FeCl₃ + 1%HCl
Test time: 72h

Acid Resistance

Test time: 24h

Corrosion rate in sulfuric acid at 80°C (mm/y)

Test time: 24h

Corrosion rate in hydrochloric acid at 80°C (mm/y)

Workability

Manufacturers must pay attention to the strength behavior of NAS74N, which experiences a significant increase below 1000°C despite having lower strength than Type 304 at high temperatures. After hot working, they should carry out solution annealing. Additionally, they must consider the cold workability of NAS74N due to its higher proof stress and lower elongation compared to Type 304

Weldability

Conventional welding processes including GTAW (TIG), GMAW (MIG/MA) can be used. We recommend using filler metals for UNS S32750 to ensure optimal welding performance and structural integrity. Neither preheating nor post-weld heat treatment is necessary. Interpass temperature should be no more than 100°C in order to prevent precipitation of intermetallic compounds of σ phases that result in brittleness.

Heat Treatment

Perform solution annealing of NAS74N within the temperature range of 1025°C to 1125°C. After this process, quickly dip the material into water or use other approved methods according to ASTM A480/A480M. This practice helps prevent brittleness at 475°C and inhibits the formation of σ phases.

Pickling

We apply a mixture of nitric and fluoric acids for pickling to effectively remove surface impurities and enhance corrosion resistance. In addition, due to its higher corrosion resistance, immersion into fused salt bath before pickling is significantly effective to take scale off. And further occasion shot blasting before pickling is extremely effective.

Applications

Seawater desalination plant, Environment-related equipment, Chemical plants, Seawater pump.

Certification

It is possible to manufacture UNS S32750 in accordance with the NORSOK standard below. The thickness is up to 40mm.

• NORSOK M-650
• NORSOK M-630 MDS D55

NAS64 (UNS S32506)
High Corrosion Resistant Duplex Stainless Steel

Nippon Yakin developed NAS64 (SUS329J4L, UNS S32506), an austenitic-ferritic stainless steel that provides excellent corrosion resistance against phosphoric acid, acetic acid, and various sulfur compounds. In particular, its high chromium and molybdenum composition significantly improves its localized corrosion resistance compared to Type 316L. Nippon Yakin supplies this product in plate, sheet, and strip form.

Chemical Composition	25Cr-6.5Ni-3.3Mo-0.17N
Product Shape	Coil	Sheet	Plate
Workability	High temperature strength is similar to Type 430 in the range of 950-1150°C. However, the steel shows a rapid increase in strength below 900ÂC. Exercise care when working with this material for cold workability, as it has high proof stress and low elongation compared to Type 304.
Weldability	You can apply various welding methods, such as shielded metal arc welding, TIG welding, and plasma welding, in the same way as with standard austenitic stainless steels. Use the same duplex grade type welding consumable.
Heat Treatment	NAS454 is not hardened by heat treatment. After heating to a solution treatment temperature of 1050-1080°C, quenching is necessary. Cool the material as rapidly as possible to minimize its exposure time to the embrittlement temperature range (475°C embrittlement, phase embrittlement).
Pickling	They use a mixture of nitric acid and hydrofluoric acid for pickling.However, descaling is somewhat difficult in comparison with Type 304. Performing alkaline immersion before acid pickling and, if possible, shot blasting, is extremely effective.
Applications	Water storage tank, Chemical plants, Environment-related equipment, Geothermal power generation, Papermaking plants, Seawater pump.

Steel Grade/Standard

Chemical Composition

Physical Properties

Mechanical Properties

Mechanical Properties at Room Temperature

NAS64 exhibits excellent localized corrosion resistance, including resistance to pitting corrosion and stress corrosion cracking, allowing its use in environments where Type 316L cannot perform. In particular, its pitting and crevice corrosion resistance is far superior.

Pitting Corrosion Resistance

Test conditions: ASTM G48 Method A (○: No pitting corrosion, ×: Pitting corrosion)
Test solution: 6% FeCl₃
Test temperature: 22°C, 50°C (Recommended temperature in this test)
Test time: 72h

Crevice Corrosion Resistance

 Test conditions: ASTM G48 Method D
Test solution: 6% FeCl₃ + 1% HCl
Test time: 72h

Stress Corrosion Cracking Resistance

 Test conditions: Immersion in boiling MgCl₂ solution
Test time: 300h
They use a U-bend test specimen.
○: No stress corrosion cracking      ×: Stress corrosion cracking

Corrosion rate in sulfuric acid at 80°C (mm/y)

Test time: 24h

Corrosion rate in hydrochloric acid at 80°C (mm/y)

Test time: 24h

Workability

High temperature strength is similar to Type 430 in the range of 950-1150°C. However, the steel shows a rapid increase in strength below 900°C. Regarding cold workability, care is required as proof stress is high and elongation is low in comparison with Type 304.

Weldability

Various welding methods are applicable in the same manner as with standard austenitic stainless steels, including shielded metal arc welding, TIG welding, and plasma welding. Use of welding electrodes for UNS S32506 is recommended. Preheating and post-heating are not necessary. In welding, the interpass temperature should be no more than 100°C to prevent formation of intermetallic compounds.

Heat Treatment

Solution annealing of NAS64 should be performed at the temperature range from 1020 to 1120°C followed by being quenched in water or rapidly cooled by other means. (Conditions provided in ASTM A480/A480M)

Pickling

A mixture of nitric acid and fluoridic acid is used in pickling. However, descaling is somewhat difficult in comparison with Type 304. Alkaline immersion before acid pickling, and if possible, shot blasting are extremely effective.

Applications

Water storage tank, chemical plants, environment-related equipment, geothermal power generation, papermaking plants, seawater pump

NAS 329J3L (UNS S32205, S31803)
NAS High Corrosion Resistant Duplex Stainless Steel

NAS 329J3L (SUS 329J3L, UNS S32205, S31803) is an Austenitic-ferritic stainless steel, which has superior corrosion resistance and high strength This steel provides better localized corrosion resistance than Type 316L and 317L, and industries such as chemical plants, seawater desalination plants, and seawater pumps apply it widely. Nippon Yakin supplies this product in plate, sheet, and strip form.

Chemical Composition	22Cr-5.3Ni-3.2Mo-0.1N
Product Shape	Coil	Sheet	Plate
Workability	High temperature strength is similar to Type 430 in the range of 950-1150°C. However, the steel shows a rapid increase in strength below 900°C. Cold working requires care because the higher proof stress and lower elongation of this steel, compared to Type 304, make the process more challenging.
Weldability	You can apply various welding methods, such as shielded metal arc welding, TIG welding, and plasma welding, in the same way as with standard austenitic stainless steels. It is recommended to use welding electrodes for UNS S32205. Preheating and post-heating are not necessary. The interpass temperature should not exceed 100°C to prevent formation of intermetallic compounds.
Heat Treatment	Solution annealing of NAS329J3L should be performed at 1040°C and higher followed by being quenched in water or rapidly cooled by other means. (Conditions provided in ASTM A480/A480M)
Pickling	You should use a mixture of nitric acid and hydrofluoric acid for pickling. Since descaling is more difficult compared to Type 304, it is recommended to perform alkaline immersion before pickling or to use shot blasting.
Applications	Chemical Plant, Chemical Tanker, Seawater desalination plant, Seawater pump, Thermal power plant flue gas desulfurization plants, Pulp and paper plants, Bridge.

Steel Grade/Standard

Chemical Composition

Physical Properties

Microstructure

A cross sectional microstructure of 16mm thick plate

Mechanical Properties

Mechanical Properties at Room Temperature

Corrosion Resistance

Pitting Corrosion Resistance

Test conditions

ASTM G48 Method A (○: No pitting corrosion, ×: Pitting corrosion)

•  Test solution: 6% FeCl₃
  Test temperature: 22°C, 50°C (Recommended temperature in this test)
  Test time: 72h

ASTM G48 Method C

• Test solution: 6% FeCl₃ + 1% HCl
  Test time: 72h

Crevice Corrosion Resistance

Test solution: 6% FeCl₃ + 1% HCl
Test time: 72h

Stress Corrosion Cracking Resistance

Test conditions: Immersion in boiling MgCl₂ solution
Test time: 300h
U-bend test specimen is used
○: No stress corrosion cracking      ×: Stress corrosion cracking

Acid Resistance

Corrosion rate in sulfuric acid at 80°C (mm/y)

Test time: 24h

Corrosion rate in hydrochloric acid at 80°C (mm/y)