... production3. 7Cr7Mo2V2Si (GB)Chemical Composition: C 0.74, Si 1.10, Mn 0.45, P≤0.030, S≤0 ... 7.10, W ≤0.50,Mo 2.10, V 1.80Annealed Hardness: HB≤255Heat treatment temp: Hardening 1100-1150 ... . 9CrWMn , it is similar to O1 Modify ( ASTM), 1.2510(DIN)), SKS3(JIS)Chemical Composition: C 0.93, Si ... mold, ornaments pressing mold6. CrWMn , it is similar to 1.2419(DIN)), SKS31(JIS)Chemical Composition: C 0.98, ...