Characteristics and scope of application: good hardenability, can obtain uniform strength in a large range of sections. After tempering or quenching and low temperature tempering, it has good comprehensive mechanical properties. Good machinability, cold deformation plastic parts and welding medium. There is a sensitivity to the formation of white spots, high temperature tempering when tempering brittle tendency. Gears, shafts, worms, bolts, pins, etc. used for working under high load conditions.
● Chemical composition:
Carbon C: 0.08 ~ 0.13(allowable deviation :±0
Si: 0.15 ~ 0.40(allowable deviation :±0
Mn: 0.40 ~ 0.70(allowable deviation :±0
Sulfur S: ≤0.030(allowable deviation :+0.
Phosphorus P: ≤0.030(allowable deviation :+0.005) Cr: 1.00 ~ 1.40(allowable deviation)
Ni: 3.00 ~ 3.50(Allowable deviation :±0
Copper Cu: ≤0.25(allowable deviation :+0
Molybdenum Mo: 0.08 ~ 0.15(allowable deviation :±0
● Mechanical properties:
tensile strength σ B (MPa) : ≥1078(110)
Elongation δ5 (%) : ≥9
Section shrinkage ψ (%) : ≥45
Impact toughness value α kV (J/cm2) : ≥78(8)
Sample size: sample size is 15mm
● Heat treatment specification and metallographic structure: heat treatment specification: quenching, the first 880±20℃, the second 790±20℃, oil cold;
● Delivery status: hot rolled or forged steel in hot rolled (forged) state or annealing state delivery. Cold drawn steel is delivered in the annealed state.
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