42CrMo4(1.7225) Alloy Structural Steel

　　Implementation standard: EN 10083/1-1991

　　Characteristics: 42CrMo4 has high strength, hardenability, good toughness, small deformation during quenching, and high creep strength and durable strength at high temperature.

　　Chemical composition

　　Carbon C: 0.38-0.45

　　Silicon Si: ≤ 0.40

　　Mn: 0.60-0.90

　　Sulfur S: Allowable Residual Content ≤0.035

　　Phosphorus p: allowable residual content ≤0.035

　　Cr: 0.90-1.20

　　Mo: 0.15-0.30

　　< 42crmo 4 standard control:

　　China GB 42CrMo, Russia ГOCT 38XM, us AISI 4140/4142, UK BS 708M40/708A42/709M40, France NF 40CD4/42CD4, Germany DIN 41CrMo4/42CrMo4, Japan JIS SCM4, international ISO 683/1 3

　　Mechanical properties

　　Tensile strength σ b (MPa): ≥ 1080 (110)

　　Yield strength σ s (MPa): ≥ 930 (95)

　　Elongation Δ 5 (%): ≥ 12

　　Section shrinkage Ψ (%): ≥ 45

　　Akv (j) of impact power: ≥ 63

　　Impact toughness value αkv (J/cm&sup2; ):≥78(8)

　　Hardness: ≤217HB

　　Sample size: the sample blank size is 25 mm.