Nippon Yakin Kogyo NAS355N Corrosion Resistant Alloys

Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model: NAS355N

NAS355N
High Corrosion Resistant Nickel Alloy

NAS355N is a high corrosion resistant nickel alloy, providing corrosion resistance in high-concentration chloride ion or sulfuric acid environments and in extremely severe corrosive environments where both high-concentration chloride ions and sulfuric acid exist. They significantly reduced the nickel content of this alloy compared to conventional high corrosion resistant nickel alloys, achieving a good balance between cost and corrosion resistance performance. Nippon Yakin supplies this product in plate, sheet, and strip form.

Chemical Composition23Cr-35Ni-7.5Mo-3Cu-0.2N
Product shapeYou can apply various welding methods in the same manner as with standard austenitic stainless steels, including shielded metal arc welding, TIG welding, and plasma welding. You should use Alloy 276 welding consumable.CoilYou can apply various welding methods in the same manner as with standard austenitic stainless steels, including shielded metal arc welding, TIG welding, and plasma welding. You should use Alloy 276 welding consumable.SheetYou can apply various welding methods in the same manner as with standard austenitic stainless steels, including shielded metal arc welding, TIG welding, and plasma welding. You should use Alloy 276 welding consumable.Plate
WorkabilityThe hot and cold workability of NAS355N is basically the same as that of standard austenitic stainless steels such as Type 304, Type 316.However, you must consider that this material has high strength in both cold and hot working processes.
WeldabilityVarious welding methods are applicable in the same manner as with the standard austenitic stainless steels, including shielded metal arc welding, TIG welding, and plasma welding.You should use Alloy 276 welding consumable.
Heat TreatmentSolution heat treatment is performed at 1030°C~1180°C using water cooling.
PicklingThey use a mixture of nitric acid and hydrofluoric acid in pickling. However, due to the high corrosion resistance of NAS355N, scale is somewhat difficult to remove in comparison with Type 304. Therefore, you should immerse the material in an alkaline solution before pickling, or, if possible, use shot blasting, which is extremely effective.
ApplicationsChemical plants, Flue gas desulfurization plants, Heat exchangers, Environment-related equipment.

Grade/Standard

Nippon Yakin GradeJISASTMEN
NAS355N

Chemical Composition

CSiMnPSNiCrMoCuN
Specification (NAS355N)≦0.030≦1.00≦1.00≦0.020≦0.00535.00 – 36.0022.00 – 24.007.00 – 8.003.00 – 4.000.19 – 0.24

Physical Properties

Density [g/cm³]8.16
Specific heat [J/kg·K]431
Electrical resistivity [µΩ·cm]107.4
Thermal conductivity [W/m·K]9.99
Average coefficient of thermal expansion [10⁻⁶/°C]30 – 100°C: 13.7
30 – 200°C: 14.2
30 – 300°C: 14.5
30 – 400°C: 14.9
Young’s modulus [MPa]18.7 × 10⁴
MagnetismNone
Melting range [°C]1320 – 1366

Mechanical Properties at Room Temperature

Specification0.2% proof stress [N/mm²]Tensile strength [N/mm²]Elongation [%]Hardness [HV]Hardness [HBW]Hardness [HRBW]
Specification (NAS355N)≥295≥640≥35≥230≥217≤96
Example: Cold-rolled sheet 2mm4228074919691

Pitting Corrosion Resistance

AlloyASTM G48 Method AASTM G48 Method C
22°C50°CCritical pitting corrosion temperature (CPT) [°C]
NAS335X×30
NAS6455
NAS185N70
NAS254N80
NAS354N103
NAS355N100

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

AlloyCritical crevice corrosion temperature (CCT) [°C]
NAS335X<0
NAS6430
NAS185N40
NAS254N45
NAS354N50
NAS355N55

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

Stress Corrosion Cracking Resistance

Alloy45% (155°C)42% (143°C)40% (138°C)38% (134°C)35% (126°C)30% (115°C)25% (110°C)20% (108°C)
NAS335X××××
NAS64××××
NAS185N×××
NAS254N××
NAS354N×××
NAS355N×

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

Acid Resistance

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

Alloy5%10%20%40%60%80%
NAS335X0.010.020.310.120.602.15
NAS64<0.010.021.07191.9105460.72
NAS185N0.041.322.893.204.78
NAS254N0.051.022.112.167.76
NAS354N0.010.030.230.063.024.99
NAS355N<0.01<0.010.311.12

Test time: 24h

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

Alloy0.1%1%2%3%
NAS640.010.1212.9430.51
NAS185N0.010.024.207.21
NAS254N0.010.020.019.14
NAS354N<0.010.030.027.35
NAS355N<0.013.65

Test time: 24h

Reference
AlloyJISUNS No.Chemical composition
NAS335XNCF020N0802020Cr-33Ni-2.5Mo-3Cu-0.4Nb
NAS64SUS329J4LS3250625Cr-6.5Ni-3.3Mo-0.17N
NAS185NSUS312LS3125420Cr-18Ni-6Mo-0.8Cu-0.2N
NAS354NNCF354N0835423Cr-35Ni-7.5Mo-0.2N
NAS355N23Cr-35Ni-5Mo-3Cu-0.2N

Workability

The hot and cold workability of NAS355N is basically the same as that of standard austenitic stainless steels such as Type 304, Type 316, etc. However, you must consider the high strength of this material in both cold and hot working processes.

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. Alloy 276 welding consumable should be used.

Heat Treatment

Solution heat treatment is performed at 1030°C~1180°C using water cooling.

Pickling

A mixture of nitric acid and hydrofluoric acid is used in pickling. However, due to the high corrosion resistance of NAS355N, scale is somewhat difficult to remove in comparison with Type 304. Therefore, the material should be immersed in an alkaline solution before pickling, or if possible, shot blasting is extremely effective.

Applications

Chemical plants, Flue gas desulfurization plants, Heat exchangers, Environment-related equipment.

 

 

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