... (GB), it is similar to A2( ASTM) 1.2363(DIN))Chemical Composition: C 1.00, Si 0.40, Mn 0.75, P≤0 ... .030, S≤0.030, Cr 5.10, Mo 1.10, V ... 1.2419(DIN)), SKS31(JIS)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: HB≤255Heat treatment ...