Standard: GB / T 1220-1992
● Features and application:
SUS431 as high corrosion resistance to nitric acid and organic acid components, containers and equipment.
● Chemical Composition:
Carbon C: 0.11 ~ 0.17
Si Si: ≤ 0.80
  Manganese Mn: ≤ 0.80
  Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.035
Chromium Cr: 16.00 ~ 18.00
Ni-Ni: 1.50 ~ 2.50
● Mechanical Properties:
Tensile strength σb (MPa): quenching and tempering, ≥ 1080
Elongation δ5 (%): quenching and tempering, ≥ 10
Impact energy Akv (J): quenching and tempering, ≥ 39
Hardness: Annealed, ≤ 285HB
● Heat treatment and microstructure specifications:
Heat treatment specifications:
1) annealing, 680 ~ 700 ℃ air-cooled high-temperature tempering;
2) quenching, 950 ~ 1050 ℃ oil cooling;
3) tempering 275 ~ 350 ℃ air-cooled.
Microstructure: Organizing for the martensitic type.
● Delivery status: normal to heat treatment delivery, the treatment types specified in the contract; not indicated, according to the heat treatment state of delivery.