Nippon Yakin Kogyo NAS354N Corrosion Resistant Alloys

Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model:NAS354N

NAS354N (UNS N08354) High Corrosion Resistant Super Stainless Steel

NAS354N (NCF354, UNS N08354, ASME Code Case 2585-1) is a super austenitic stainless steel with excellent corrosion resistance in various environments. The high chromium, molybdenum, and nitrogen contents provide high resistance to crevice and pitting corrosion in oxidizing chloride environments while the high nickel content enhances resistance to stress corrosion cracking. The corrosion resistance of NAS354N exceeds the conventional 6 Mo super austenitic stainless steels because of containing 7.5% Mo. Nippon Yakin supplies this product in plate , sheet, and strip form.

Chemical Composition23Cr-35Ni-7.5Mo-0.2N
Product shapeCoil
Coil
Sheet
Sheet
Plate
Plate
WorkabilityThe hot and cold workability of NAS354N is basically the same as that of standard austenitic stainless steels such as Type 304, Type 316. However, you must consider the high strength of this material in both cold and hot working.
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.
MachinabilityAs a feature of high Ni stainless steels, although machining is difficult in comparison with the standard austenitic stainless steels, it is easier than with Ni-based alloys. An ultrahard tool should be used in machining if at all possible. It is also advisable to use a slower feed rate and deeper cutting depth.
Heat TreatmentSolution annealing of NAS354N is normally performed at the temperature range from 1125 to 1175°C followed by being quenched in water or rapidly cooled by other means.
PicklingA mixture of nitric acid and hydrofluoric acid is used in pickling. However, due to the high corrosion resistance of NAS354N, 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.
ApplicationsChemical plants, Food manufacturing plants, Salt manufacturing plants, Heat exchangers, Marine structures, Environment-related equipment.

Steel Grade/Standard

Nippon Yakin GradeJIS G 4902ASTM B625EN
NAS354NNCF354UNS N08354

Chemical Composition

SpecificationCSiMnPSNiCrMoN
NCF354≦0.030≦1.00≦1.00≦0.030≦0.01034.00 – 36.0022.00 – 24.007.00 – 8.000.17 – 0.24
UNS N08354≦0.030≦1.00≦1.00≦0.030≦0.01034.00 – 36.0022.00 – 24.007.00 – 8.000.17 – 0.24

Physical Properties

Density [g/cm³]8.16
Specific heat [J/kg·K]454
Electrical resistivity [µΩ·cm]105.6
Thermal conductivity [W/m·K]11.3
Average coefficient of thermal expansion [10⁻⁶/°C]30 – 100°C: 14.0
30 – 200°C: 14.4
30 – 300°C: 14.7
30 – 400°C: 15.1
Young’s modulus [MPa]19.4 × 10⁴
MagnetismNone
Melting range [°C]1362 – 1391

Mechanical Properties

Mechanical Properties at Room Temperature

Specification0.2% proof stress [MPa]Tensile strength [MPa]Elongation [%]Hardness [HV]Hardness [HRBW]
Specification (NCF354)≥295≥640≥40
Specification (UNS N08354)≥295≥640≥40
Example: Cold-rolled sheet 2mm3937955218889
Corrosion Resistance

NAS354N is a high Cr, high Mo stainless steel which provides excellent pitting corrosion resistance and crevice corrosion resistance in high Cl environments. As a high Ni steel, it also offers excellent stress corrosion cracking resistance.

Pitting Corrosion Resistance

AlloyASTM G48 Method AASTM G48 Method C
22°C50°CCritical pitting corrosion temperature CPT (°C)
NAS329J3L×50
NAS6455
NAS185N70
NAS254N80
NAS354N103

ASTM G48 Method A (○: No pitting corrosion, ×: Pitting corrosion)
Test solution: 6%FeCl 3
Test temperature: 22°C, 50°C (Recommended temperature in this test)
Test time: 72h

Crevice Corrosion Resistance

AlloyASTM G48 Method D
Critical crevice corrosion temperature CCT (°C)
NAS329J3L25
NAS6430
NAS185N40
NAS254N45
NAS354N60

Test conditions: ASTM G48 Method D
Test solution: 6%FeCl 3 + 1%HCl
Test time: 72h

Stress Corrosion Cracking Resistance

AlloyMgCl₂ concentration (boiling point °C are in brackets)
45% (155°C)42% (143°C)40% (138°C)38% (134°C)35% (126°C)30% (115°C)25% (110°C)20% (108°C)
NAS329J3L×××××
NAS64×××
NAS185N×××
NAS254N××
NAS354N×××

 

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)

Alloy5%10%20%40%60%80%
NAS329J3L0.010.174.65365.91456106.4
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

Test time: 24h

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

Alloy0.1%1%2%3%
NAS329J3L0.020.0331.1060.62
NAS640.010.1212.9430.51
NAS185N0.010.024.207.21
NAS254N0.010.020.019.14
NAS354N0.020.030.027.35

Test time: 24h

Reference
AlloyJISUNS No.Chemical composition
NAS329J3LSUS329J3LS3220522Cr-5.3Ni-3.2Mo-0.16N
NAS64SUS329J4LS3250625Cr-6.5Ni-3.3Mo-0.17N
NAS185NSUS312LS3125420Cr-18Ni-6Mo-0.8Cu-0.2N
NAS254NSUS836LS3205323Cr-25Ni-5.5Mo-0.2N
NAS354NNCF354N0835423Cr-35Ni-7.5Mo-0.2N

 

REQUEST QUOTATION

PAYMENT

payment-methods

Return Top