The composition and properties of aisi 4130 alloy steel

The chemical composition of the aisi 4130 alloy steel:
Carbon (C): 0.28 ~ 0.33
Silicon (Si): 0.15 ~ 0.35
Manganese (Mn): 0.40 ~ 0.60
Sulfur (S): allows the residual content is less than or equal to 0.040
Phosphorus (P): allows the residual content is less than or equal to 0.035
Chromium (Cr): 0.80 ~ 1.10
Nickel (Ni): allows the residual content is less than or equal to 0.030
Copper (Cu): allows the residual content is less than or equal to 0.030
Molybdenum (Mo): 0.15 ~ 0.25
The mechanical properties of alloy steel 4130:
Tensile strength σb (MPa): ≥930 (95)
Yield strength σs (MPa): ≥785 (80)
Elongation δ5 (%): ≥12
Section shrinkage ψ (%): ≥50
Impact energy Akv (J): ≥63
Impact toughness αkv (J / cm2): ≥78 (8)
Hardness: ≤229HB
Sample size: Sample size is 25mm rough
Heat treatment specifications: quenching 880 ℃, water cooling, oil cooling; tempering 540 ℃, water cooling, oil cooling.

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