Models: S780, S660, S550, S460, S390, S330, S280, S230, S170, S110, S70

Hardness: regular 40-50HRC Special 52-56HRC 56-60HRC

Chemical Composition: C: 0.70~1.20%， Mn:0.35~1.20%，Si: >0.40, S<0.05, P<0.05

Durability: 2000~2800 Times