GB/T 3077 30CrMnSiA alloy steel

30CrMnSiA is a medium carbon with high strength. 30CrMnSiA has high strength，good hardenability and sufficient toughness after quenching and tempering. Meanwhile, 30CrMnSiA has good process ability, small processing deformation and good fatigue resistance and it is mainly used in various special wear parts such as automobiles and airplanes.

Chemical Composition of 30CrMnSiA

C: 0.28~0.34
Si: 0.90~1.20
Mn: 0.80~1.10
S: Allowable residual content≤0.025
P: Allowable residual content≤0.025
Cr: 0.80~1.10
Ni: Allowable residual content≤0.030
Cu: Allowable residual content≤0.025

30CrMnSiA alloy steel Mechanical Property

Tensile strength σb (MPa): ≥ 1080 (110)
Yield strength σs (MPa): ≥ 835 (85)
Elongation δ5 (%): ≥10
Area shrinkage ψ (%): ≥ 45
Impact work Akv (J): ≥39
Impact toughness value αkv (J/cm sup2;): ≥49(5)
Hardness: ≤229HB

30CrMnSiA Heat treatment specifications and metallographic organization:

Heat treatment specification: quenching 880 ° C, oil cooling; tempering 540 ° C, water cooling, oil cooling.