Standard:
     
Chemical composition:
     
     Carbon C: ≤ 0.08
     Si Si: ≤ 1.00
     Manganese Mn: ≤ 2.00
     Sulfur S: ≤ 0.030
     Phosphorus P: ≤ 0.035
     Chromium Cr: 18.00 ~ 20.00
     Ni-Ni: 11.00 ~ 15.00
     Mo Mo: 3.00 ~ 4.00
     
Mechanical properties:
      Tensile strength σb (MPa): ≥ 520
      Conditions yield strength σ0.2 (MPa): ≥ 205
      Elongation δ5 (%): ≥ 40
      Reduction of area ψ (%): ≥ 60
      Hardness: ≤ 187HB; ≤ 90HRB; ≤ 200HV

Heat treatment and microstructure specifications:

Heat treatment specifications:

      Solution 1010 ~ 1150 ℃ fast-cooling.
Microstructure:

      Organizing for the austenitic type.