Chemical composition:

A carbon (C) 0.27 ~ 0.34,
Manganese (Mn) 0.50 ~ 0.80
, Nickel (Ni) ≤0.30,
Silicon (Si) 0.17 ~ 0.37
, Phosphorus (P) ≤0.035,
Sulfur (S) ≤0.035,
Chromium (Cr) ≤0.25,
Copper (Cu) ≤0.25
Mechanical properties:

Tensile strength σb (MPa) ≥490

Yield strength σs (MPa) ≥295,

Elongation δ5 (%) ≥21,

Reduction of ψ (%) ≥50

Impact energy Akv (J) ≥63,

Hardness: no heat ≤179HB