55Si2Mn spring steel

silicon and manganese improve elastic strength and yield ratio, improve hardenability, anti-tempering stability and anti-relaxation stability, and have less sensitivity to overheating, but have a greater tendency to decarburize, especially silicon and carbon When the content is higher, carbon is easy to graphitize, making steel brittle. 55Si2Mn spring steel is used as vibration damping leaf spring and coil spring on automobiles, tractors and locomotives, cylinder safety valve spring, and can also be used as heat-resistant springs below 250°C.

Mechanical properties Tensile strength σb (MPa): ≥1274(130) Yield strength σs (MPa): ≥1176(120) Elongation δ10 (%): ≥6 Hardness: hot rolled, ≤302HB; cold drawn + heat treatment, ≤321HB