It belongs to high-temperature bearing steel, and its service temperature reaches 260 degrees Celsius. This is a martensitic stainless steel.

Alloy composition:

C: 0.95- 1. 1

Si & lt=0.8

Mn & lt=0.8

S & lt=0.03

P & lt=0.035

Cr: 16- 18

Ni: When allowed to include

Mo: 0.4-0.7

Heat treatment specification:

1. Annealing: 800-900 degrees, slow cooling, hardness.

2. Quenching: 1000- 1050 degrees, oil cooling, hardness >; =HRC55

3. Tempering: 200-300 degrees, air cooling.