1. 20CrMo materials 2 .Deepness 0.5-0.8 , hardness 58-62 HRC, heat treatment for depth at 38-45 HRC 3 Hard chromium 0.03-0.05 , hardness=800-1000 , melting point =1800 4 Low noise and resistance to adhesion abrasion strong. 4 OEM available Competitive price Timely delivery Quantity guarantee |