... bulk production3. 7Cr7Mo2V2Si (GB)Chemical Composition: C 0.74, Si 1.10, Mn 0.45, P≤0.030, S≤0.030, Cr 7 ... similar to A2( ASTM) 1.2363(DIN))Chemical Composition: C 1.00, Si 0.40, Mn 0.75, P≤0.030, S≤0. ... O1 Modify ( ASTM), 1.2510(DIN)), SKS3(JIS)Chemical Composition: C 0.93, Si 0.40, Mn 1.20, P≤0.030, S≤ ... Chemical Composition: C 0.98, Si 0.40, Mn 1.00, P≤0.030, S≤0. 030, Cr 1.00, W 1.40,Annealed Hardness ...