Material Name: 55CrMnA spring steel
Standard: GB / T 1222-1984 ● Features and Scope: High strength, ductility and toughness, hardenability better thermal sensitivity is lower than steel, higher than silico-manganese steel, silico-manganese steel decarburization tendency smaller than, temper brittleness. For vehicles, tractors industrial production load is heavy, stress is large leaf springs and larger diameter coil spring. ● Chemical Composition: Carbon C: 0.52 ~ 0.60 Si Si: 0.17 ~ 0.37 Mn Mn: 0.65 ~ 0.95 Sulfur S: ≤0.030 Phosphorus P: ≤0.030 Chromium Cr: 0.65 ~ 0.95 Ni Ni: ≤0.35 Copper Cu: ≤0.25 ● Mechanical Properties: Tensile strength σb (MPa): ≥1225 (125) Conditions yield strength σ0.2 (MPa): ≥1978 (110) Elongation δ5 (%): ≥9 (for reference) Reduction of ψ (%): ≥20 Hardness: hot, ≤321HB; Cold Drawn + heat, ≤321HB ● Heat treatment and microstructure specifications: Heat treatment specifications: quenching 830 ~ 860 ℃, oil cooling; tempering 460 ~ 510 ℃. ● Delivery status: hot-rolled steel to heat treatment or heat treatment delivery, cold-drawn steel to heat treatment delivery |