60Cr3 (1.7177) spring steel high strength, ductility and toughness, good hardenability, heat-sensitive than the low-manganese steel, higher than the Si-Mn steel, silico-manganese steel decarburization tendency than the small, temper brittleness. For vehicles, tractors industrial production of heavy load, stress and a larger spring diameter larger coil spring.

Chemical composition:


Carbon C: 0.56 ~ 0.64


Si Si: 0.17 ~ 0.37


Manganese Mn: 0.70 ~ 1.00


Sulfur S: ≤ 0.030


Phosphorus P: ≤ 0.030


Chromium Cr: 0.70 ~ 1.00


Ni-Ni: ≤ 0.35


Copper Cu: ≤ 0.25


● Mechanical Properties:


Tensile strength σb (MPa): ≥ 1225 (125)


Conditions yield strength σ0.2 (MPa): ≥ 1078 (110)


Elongation δ5 (%): ≥ 9 (for reference)


Reduction of area ψ (%): ≥ 20


Hardness: hot, ≤ 321HB; cold-drawn + heat treatment, ≤ 321HB


● Heat treatment and microstructure specifications:


Standard heat treatment: quenching 830 ~ 860 ℃, oil cooling; tempering 460 ~ 520 ℃.