35CrMo alloy structural steel and 42CrMo alloy structural steel are more commonly used alloy structural steels, so what are the differences between the two?
1. Comparison of chemical composition:
Chemical composition of 35CrMo alloy structural steel: C: 0.32～0.40, Si: 0.17～0.37, Mn: 0.40～0.70, S: allowable residual content ≤0.035, P: allowable residual content ≤0.035, Cr: 0.80～1.10, Ni: allowable Residual content ≤0.30, Cu: allowable residual content ≤0.30, Mo: 0.15 ~ 0.25.
Chemical composition of 42CrMo alloy structural steel: C: 0.38～0.45%, Si: 0.17～0.37%, Mn: 0.50～0.80%, S: allowable residual content≤0.035%, P: allowable residual content ≤0.035%, Cr: 0.90～ 1.20%, Ni: allowable residual content≤0.030%, Cu: allowable residual content ≤0.030%, Mo: 0.15～0.25%
In terms of chemical composition, there is almost no differences between the two.
2. Comparison of mechanical properties:
Mechanical properties of 35CrMo alloy structural steel: tensile strength σb (MPa): ≥985 (100) Yield strength σs (MPa): ≥835 (85), elongation δ5 (%): ≥12, reduction of area ψ (%) ): ≥45, impact energy Akv (J): ≥63, impact toughness value αkv (J/cm²): ≥78(8), hardness: ≤229HB.
Mechanical properties of 42CrMo alloy structural steel: tensile strength σb (MPa): ≥1080 (110), yield strength σs (MPa): ≥930 (95), elongation δ5 (%): ≥12, reduction of area ψ ( %): ≥45, impact energy Akv (J): ≥63, impact toughness value αkv (J/cm2): ≥78(8), hardness: ≤217HB.
From the performance point of view, the strength of 42CrMo alloy structural steel is higher than that of 35CrMo alloy structural steel, but it is not very obvious.
From the above analysis, it can be seen that in terms of chemical composition and performance alone, 42CrMo alloy structural steel and 35CrMo alloy structural steel are basically the same, but after all, they are two different materials, so there are still certain essential differences. Among them, 42CrMo alloy structure Steel has higher carbon content than 35CrMo alloy structural steel, so it has higher strength and better hardenability. At the same time, after quenching, the structure of 42CrMo alloy structural steel is more refined than that of 35CrMo alloy structural steel, and it is less prone to overheating than 35CrMo alloy structural steel.
