Standard: GB / T 1220-1992
● Features and application:
As a turbine blade and high-stress components of a good heat-resistant stainless steel.
● Chemical Composition:
Carbon C: ≤ 0.15
Si Si: ≤ 0.50
Manganese Mn: ≤ 1.00
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.035
Chromium Cr: 11.50 ~ 13.00
Ni: to allow containing ≤ 0.60
● Mechanical Properties:
Tensile strength σb (MPa): quenching and tempering, ≥ 590
Conditions yield strength σ0.2 (MPa): quenching and tempering, ≥ 390
Elongation δ5 (%): quenching and tempering, ≥ 25
Reduction of area ψ (%): quenching and tempering, ≥ 55
Impact energy Akv (J): quenching and tempering, ≥ 118
Hardness: Annealed, ≤ 200HB; quenching and tempering, ≥ 170HB
● Heat treatment and microstructure specifications:
Heat treatment specifications: 1) annealing, 800 ~ 900 ℃ slow cooling or rapid cooling of about 750 ℃??; 2) quenching, 959 ~ 1000 ℃ oil cooling; 3) tempering 700 ~ 750 ℃ ??fast-cooling.
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.
