... ), SKD61(JIS)Chemical Composition: C 0.39, Si 1.10, Mn 0.30, P≤0.028, S≤0. ... molds5. 7Cr7Mo2V2Si (GB)Chemical Composition: C 0.74, Si 1.10, Mn 0.45, P≤0.030, S≤0.030 ... ), SKD61(JIS)Chemical Composition: C 0.39, Si 1.10, Mn 0.30, P≤0.028, S≤0. ... . 7Cr7Mo2V2Si (GB)Chemical Composition: C 0.74, Si 1.10, Mn 0.45, P≤0.030, S≤0.030 ... . 7Cr7Mo2V2Si (GB)Chemical Composition: C 0.74, Si 1.10, Mn 0.45, P≤0.030, S≤0.030 ...