Carbon C: 0.52 ~ 0.60 
 Silicon Si: 1.50 ~ 2.00 Mn Mn: 0.60 ~ 0.90 SS: ≤ 0.035 phosphorus P: ≤ 0.035 Chromium Cr: ≤ 0.35 Ni - Ni: ≤ 0.35 Copper Cu: ≤ 0.25 

 Tensile strength σb (MPa): ≥ 1 274 (130) yield strength σs (MPa): ≥ 1176 (120) δ10 of elongation (%): ≥ 6 Reduction of the rate of ψ (%): ≥ 30 Hardness: hot, ≤ 302HB; Cold Drawn + heat treatment, ≤ 321HB