Standard: GB / T 1220-1992
 
Features and application:
 
Corrosion-resistant stainless steel, eliminating the heat treatment does not produce heat-induced deformation, with super-mirror finish performance, in the annealed condition with good machining properties. For corrosive gases or fluorinated plastics flame retardant plastic mold of corrosion.
 
Chemical composition:
 
C 0.26-0.40 Mn ≤ 1.00 Si ≤ 1.00, P ≤ 0.040 S ≤ 0.030 Cr 12.00-14.00 Ni ≤ 0.60
 
Properties: yield strength (N/mm2) ≥ 540, tensile strength (N/mm2) ≥ 740, elongation EL (%) ≥ 12, hardness ≥ HBW217
 
Reduction of /% ≥ 40 Charpy impact value / (J/cm2) ≥ 29
 
Heat Treatment / ℃
 
Quenching temperature of 1000 ~ 1050 ℃, tempering temperature of 200 ~ 500 ℃, Hardness 50 ~ 55HRC.