high quality spring steel bar 60si2mna

chemical composition
Carbon C: 0.52 to 0.60
Silicon Si: 1.5 to 2.0
Manganese Mn: 1.00 to 1.30
Sulfur S: ≤0.035
Phosphorus P: ≤0.035
Chrome Cr:≤0.35
Nickel Ni:≤0.35
Copper Cu:≤0.25
Vanadium V: 0.08 to 0.16
Boron B: 0.0005 to 0.0035

Mechanical properties
Tensile strength σb (MPa): ≥1372(140)
Hardness: hot rolling, ≤ 321HB; cold drawing + heat treatment, ≤ 321HB

Corresponding steel
China GB Standard Steel No. 60Si2MnA;
Japan JIS Standard Steel No. SUP6/SUP7;
German DIN standard steel No. 60SiCr7;
British BS Standard Steel No. 251H60;
French NF standard steel 61SC7;
American AISI/SAE standard steel number H2600;
International Standard Organization ISO Standard Steel No. 61SiCr7.