Standard: GB / T 1220-1992
● Features and application:
8Cr17 hardened state, than 7Cr17 hard, and toughness than 11Cr17 high. Used as cutting tools, valves.
● Chemical Composition:
Carbon C: 0.75 ~ 0.95
Si Si: ≤ 1.00
Manganese Mn: ≤ 1.00
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.035
Chromium Cr: 16.00 ~ 18.00
Ni: to allow containing ≤ 0.60
Mo Mo: ≤ 0.75 can be added
● Mechanical Properties:
Hardness: Annealed, ≤ 255HB; quenching and tempering, ≥ 56HRC
● Heat treatment and microstructure specifications:
Heat treatment specifications: 1) annealing, 800 ~ 920 ℃ slow cooling; 2) quenching, 1010 ~ 1070 ℃ oil cooling; 3) temper, 100 ~ 180 ℃ 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.
