34Cr4 chemical composition: 
 Carbon C: 0.30 ~ 0.37 34Cr4 
 Silicon Si: ≤ 0.40 
 Mn Mn: 0.60 ~ 0.90 
 Sulfur S: Allow the residual content of ≤ 0.035 
 Phosphorus P: Allow the residual content of ≤ 0.035 
 Chromium Cr: 0.90 ~ 1.20 
 Ni: to allow the residual content of ≤ 0.25 Copper Cu: to allow the residual content of ≤ 0.030 
 34Cr4 mechanical performance: 
 Tensile strength σb (MPa): ≥ 930 (95) 
 Yield strength σs (MPa): ≥ 735 (75) 
 Elongation δ5 (%): ≥ 11 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 47 
 The impact toughness αkv (J/cm2): ≥ 59 (6) 
 Hardness: ≤ 207HB