Nippon Yakin Kogyo NAS329J3L Corrosion Resistant Alloys

Manufacturer: Nippon Yakin Kogyo Co., Ltd
Model: NAS329J3L

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 Composition22Cr-5.3Ni-3.2Mo-0.1N
Product Shape

Nippon Yakin Kogyo NAS329J3L Corrosion Resistant AlloysCoil

Nippon Yakin Kogyo NAS329J3L Corrosion Resistant AlloysSheet

Nippon Yakin Kogyo NAS329J3L Corrosion Resistant AlloysPlate

WorkabilityHigh 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.
WeldabilityYou 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 TreatmentSolution 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)
PicklingYou 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.
ApplicationsChemical Plant, Chemical Tanker, Seawater desalination plant, Seawater pump, Thermal power plant flue gas desulfurization plants, Pulp and paper plants, Bridge.

Steel Grade/Standard

Nippon Yakin GradeJIS G4304/4305ASTM A240EN 10088-2/10028-7
NAS 329J3LSUS 329J3LUNS S32205/S318031.4462

Chemical Composition

CSiMnPSNiCrMoN
Specification (SUS 329J3L)≦0.030≦1.00≦2.00≦0.040≦0.0304.50 ~ 6.5021.00 ~ 24.002.50 ~ 3.500.08 ~ 0.20
Specification (UNS S32205)≦0.030≦1.00≦2.00≦0.030≦0.0204.5 ~ 6.522.00 ~ 23.003.0 ~ 3.50.14 ~ 0.20
Specification (UNS S31803)≦0.030≦1.00≦2.00≦0.030≦0.0204.5 ~ 6.521.0 ~ 23.02.5 ~ 3.50.08 ~ 0.20

Physical Properties

Density [g/cm³]7.80
Specific heat [J/kg·K]460
Electrical resistivity [μΩ·cm]87.0
Thermal conductivity [W/m·K]13.9
Average coefficient of thermal expansion [10⁻⁶/°C]20 ~ 100°C: 12.7
20 ~ 200°C: 13.1
20 ~ 300°C: 13.5
20 ~ 400°C: 13.8
Young’s modulus [MPa]19.5 × 10⁴
MagnetismY (magnetizable)
Melting range [°C]1420 ~ 1465

Microstructure

It consists of 40-50% of ferritic phase and the rest of austenitic phase. (Grey part is ferritic phase and white part is austenitic phase)
Nippon Yakin Kogyo NAS329J3L Corrosion Resistant AlloysA cross sectional microstructure of 16mm thick plate

Mechanical Properties

Mechanical Properties at Room Temperature

Specification0.2% proof stress [MPa]Tensile strength [MPa]Elongation [%]Hardness [HV]Hardness [HB]
Specification (SUS 329J3L)≥450≥620≥18≤320≤302
Specification (UNS S32205)≥450≥655≥25≤293
Specification (UNS S31803)≥450≥620≥25≤293
Example: Hot-rolled plate 16mm56378035222
Example: Cold-rolled sheet 2mm63082828253

Corrosion Resistance

Local corrosion resistance such as pitting, crevice, and stress corrosion cracking of NAS 329J3L is better than conventional stainless steel such as type 304 and 316L. General corrosion resistance in acidic environments is good if the acid content is low.

Pitting Corrosion Resistance

AlloyASTM G48 Method AASTM G48 Method C
22°C50°CCritical pitting corrosion temperature CPT (°C)
SUS 304××10
SUS 316L××15
NAS 329J3L×50

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

AlloyASTM G48 Method D
Critical crevice corrosion temperature CCT (°C)SUS 304<10
SUS 316L<10
NAS 329J3L25

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)
SUS 304×××××××
SUS 316L××××××××
NAS 329J3L××××××

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%
SUS 30414.59195.21347231.8151.4137.4
SUS 316L0.671.8946.94704.533.74106.4
NAS 329J3L0.010.174.65365.91456106.4

Test time: 24h

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

Alloy0.1%1%2%3%
SUS 3042.422.118.1315.12
SUS 316L0.022.737.6514.68
NAS 329J3L0.033.1110.6623.74

Test time: 24h

Reference
AlloyNippon YakinJISUNS No.Chemical composition
SUS 304S3040018Cr-8Ni
SUS 316LS31603170Cr-12Ni-2Mo
NAS 329J3LS3220522Cr-5.3Ni-3.2Mo-0.16N

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. The use of welding electrodes for UNS S32205 is recommended. Preheating and post-heating are not necessary. The interpass temperature should be no more than 100°C to prevent the formation of intermetallic compounds.

Heat Treatment

Solution annealing of NAS 329J3L 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

A mixture of nitric acid and fluoridic acid is used in pickling. Descaling is somewhat difficult in comparison with Type 304, so alkaline immersion before pickling, or shot blasting, is recommended.

Applications

  • Chemical Plant, Chemical Tanker
  • Seawater desalination plant, Seawater pump
  • Thermal power plant flue gas desulfurization plants
  • Pulp and paper plants
  • Bridge

Certification

It is possible to manufacture UNS S32205/S31803 in accordance with the NORSOK standard. The thickness is up to 50mm.

  • NORSOK M-650
  • NORSOK M-630 MDS D45

 

 

 

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