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30CrNiMo8 alloy steel plate

Posted:2021-08-31 13:54:38
30CrNiMo8 alloy steel plate
1. Material description of 30CrNiMo8 steel plate
30CrNiMo8 is an alloy structural steel that can be used as shaft parts, butt joints and gears.

2. Characteristics of 30CrNiMo8 steel plate: it has high yield strength, tensile strength and fatigue strength, as well as plasticity and resistance.

3. Melting analysis of chemical composition of 30CrNiMo8 alloy steel plate:
Carbon C: 0.30 - 0.40
Silicon Si: 0.17 - 0.37
Mn: 0.50 - 0.80
Sulfur S: ≤ 0.020
Phosphorus P: ≤ 0.025
Cr: 1.10 - 1.70
Nickel: 2.75 - 3.25
Mo: 0.25 - 0.40

4. Mechanical properties of 30CrNiMo8 steel plate:
Tensile strength σb (MPa):755-900
Conditional compliance strength σ0.2 (MPa):590-785
Elongation δ5 (%):12-14
Section shortening rate ψ (%): 32-40
Impact resistance value αkv (J/cm2):32-55
Hardness: 241 - 341HB

5. Heat treatment standard and metallographic arrangement of 30CrNiMo8 alloy steel plate:
Heat treatment standard: 840 - 860℃ oil quenching + 520 - 590℃ tempering, oil cooling.
Metallographic arrangement: 1) martensite after quenching; 2) After quenching and high temperature tempering, it is tempered sorbite.
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