Carbon C: 0.32 ~ 0.40 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.40 ~ 0.70 
 Sulfur S: Allow the residual content of ≤ 0.025 
 Phosphorus P: Allow the residual content of ≤ 0.025 
 Chromium Cr: 0.80 ~ 1.10 
 Ni: to allow the residual content of ≤ 0.030 
 Cu: to allow the residual content of ≤ 0.030 
 Mo Mo: 0.15 to 0.25 
 Mechanical properties: 
 Tensile strength σb (MPa): ≥ 985 (100) 
 Yield strength σs (MPa): ≥ 835 (85) 
 Elongation δ5 (%): ≥ 12 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 63 
 Impact the toughness the value αkv (J/cm2): ≥ 78 (8) 
 Hardness: ≤ 229HB