20CrMnMo chemical composition and mechanical properties

Chemical composition

Mass fraction (%):
Carbon C: 0.17 ~ 0.23
Silicon Si: 0.17 ~ 0.37
Manganese Mn: 0.90 ~ 1.20
Sulfur S: allow the residual content ≤ 0.035
Phosphorus P: allow the residual content ≤ 0.035
Chromium Cr: 1.10 ~ 1.40
Ni: to allow the residual content ≤ 0.030
Cu: to allow the residual content ≤ 0.030
Molybdenum Mo: 0.20 ~ 0.30
Mechanical Properties

[Sample blank size]
15mm
[Heat treatment]
Quenching temperature (° C): 850; coolant: oil
Tempering heating temperature (° C): 200; coolant: water, air
Mechanical Properties
Tensile strength (σb / MPa): ≥ 1180
    Yield Point (σs / MPa): ≥ 885
Elongation rate (δ5 /%): ≥ 10
Section shrinkage (ψ /%): ≥ 45
Impact absorbed energy (Aku2 / J): ≥ 55
Brinell hardness (HBS100/3000) (annealing or tempering state): ≤ 217
Delivery status: to heat treatment (normalizing, annealing or high-temperature tempering) or without heat treatment delivery, the delivery status should be in the contract

Indicate.