SK7（SK6）
SK7 is a high carbon content of 0.6 asthma steel, hardened after use, SK7 excellent wear resistance, and is cheaper tool steel. There is some need for sliding parts, and production of high hardness cold mold parts. sk7 be flexible material commonly used in parts, stamping with spcc similar characteristics, hardness and rebound slightly stronger, often punching and then heat treated to achieve the required hardness and elasticity.
Density: 7.93g/cm3
Supply hardness:
Soft state: HV190 the following
Semi-hard: HV240-280
Full Hard: HRC42-60
Production standards: Japan JIS standard
Chemical composition:
Carbon (C) 0.60 ~ 0.70 Manganese (Mn) 0.50 Silicon (Si) 0.35 Phosphorus (P) 0.030 sulfur (S) 0.030
