Material Name: 60Si2CrA
Standard: GB / T 1222-1984
● Features and Scope:
Compared with silico-manganese steel, similar to when the plastic has a high tensile strength and yield strength, quenched steel permeability greater temper brittleness. To withstand high stress and operating temperature of the spring at 300 ~ 350 ℃ or less, such as the governor springs, turbine steam seal springs, disc springs high pressure pumps, condensers support spring and with spring breakers, etc..
● Chemical Composition:
Carbon C: 0.56 ~ 0.64
Si Si: 1.40 ~ 1.80
Mn Mn: 0.40 ~ 0.70
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): ≥1764 (180)
Yield strength σs (MPa): ≥1568 (160)
Elongation δ5 (%): ≥6
Reduction of ψ (%): ≥20
Hardness: hot + heat, ≤321HB; Cold Drawn + heat, ≤321HB
● Heat treatment and microstructure specifications:
Heat treatment specifications: quenching 870 ℃ ± 20 ℃, oil cooling; tempering 420 ℃ ± 50 ℃ (when special needs, ± 30 ℃).
● Delivery status: hot-rolled steel to heat treatment or heat treatment delivery, cold drawn steel to heat treatment delivery.