SUS431 is used for parts, containers, and equipment with high resistance to nitric acid and organic acid corrosion.

Standard: GB/T 1220-1992

Chemical Composition:

Carbon C: 0.11～0.17

Silicon Si: ≤0.80

Manganese Mn: ≤0.80

Sulfur S: ≤0.030

Phosphorus P: ≤0.035

Chromium Cr: 16.00～18.00

Nickel Ni: 1.50～2.50

Mechanical Properties:

Tensile Strength σb (MPa): Quenched and tempered, ≥1080

Elongation δ5 (%): Quenched and tempered, ≥10

Impact Energy Akv (J): Quenched and tempered, ≥39

Hardness: Annealed, ≤285HB

Heat Treatment Specifications and Metallographic Structure:

Heat Treatment Specifications

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1) Annealing, 680～700℃ high-temperature tempering, air cooling;

2) Quenching, 950～1050℃ oil cooling;

3) Tempering, 275～350℃ air cooling.

Metallographic Structure: The structural characteristic is martensitic.

Delivery Condition: Generally delivered in heat-treated condition, with the type of heat treatment specified in the contract; if not specified, delivered in non-heat-treated condition.

3Cr2W8V—Die Steel‖, 5CrNiMo, 9CrSi‖Die Steel, GCr15 Bearing Steel, ‖60Si2Mn Spring Steel, 35CrMo—Alloy Steel, 40Cr—Gear Steel, 38CrMoAl—Machinery Steel, 20CrMnTi, 42CrMo, W6Mo5Cr4V2—High-Speed Steel, SKH-9 High-Speed Steel, Electric Furnace, Electroslag H13—Die Steel‖, Cr12MoV—Die Steel, LD—Die Steel, Alloy Steel, High-Speed Steel Round Bar and H13—Electroslag Module, P20—Die Steel, 718H—Die Steel, 2738, NAK80, S136 Plate Module

Cold Work Die Steel: Cr12MoV, Cr12Mo1V1, SKD11, D2, CrWMn, LD, DC53
Hot Work Die Steel: 5CrNiMo, 5CrNiMoV (1.2714), SWQH13, SWMD, 1.2367, DSAMAX, 3Cr2W8V
Plastic Mold Steel: SWP20, SW718H, S136, 4Cr13
Alloy Tool Steel: 9CrSi
High-Speed Tool Steel: W6Mo5Cr4V2, W18Cr4V