Standard: GB / T 1220-1992
● Features and application:
Bearing rings and rolling elements made of high carbon chromium stainless steel with.
● Chemical Composition:
Carbon C: 0.95 ~ 1.10
Si Si: ≤ 0.80
Manganese Mn: ≤ 0.80
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.035
Chromium Cr: 16.00 ~ 18.00
Ni: to allow containing ≤ 0.60
Mo Mo: 0.40 ~ 0.70
● Mechanical Properties:
Hardness: Annealed, ≤ 269HB; quenching and tempering, ≥ 55HV
● Heat treatment and microstructure specifications:
Heat treatment specifications: 1) annealing, 800 ~ 900 ℃ slow cooling; 2) quenching, 1000 ~ 1050 ℃ oil cooling; 3) temper, 200 ~ 300 ℃ 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 non-heat treatment delivery
