45CrNiMoVA chemical composition and mechanical properties, main uses Aluminum Mirror,Enhanced Aluminum Mirror,Protected Aluminum Mirror,Protected Aluminum Mirror Coatings Lambda Research Optics ChangChun,LTD. , https://www.lambdachina.com
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45CrNiMoVA
45CrNiMoVA
Standard: GB/T 3077-1988
45CrNiMoVA is a low-alloy ultra-high-strength steel with high hardenability and a critical hardenable diameter of 60mm (96% martensite). The steel can obtain high strength after quenching and tempering. Resilience, and can be processed; but cold deformation plasticity and weldability are low. Corrosion resistance is poor, affected by the tempering temperature, the use temperature should not be too high, usually used after quenching, low temperature (or medium temperature) tempering.
â—Chemical composition:
Carbon C: 0.42~0.49
Silicon Si: 0.17~0.37
Manganese Mn: 0.50 to 0.80
Sulfur S: Allowable residual content ≤0.025
Phosphorus P: Allowable residual content ≤0.025
Chromium Cr: 0.80~1.10
Nickel Ni: 1.30~1.80
Copper Cu: Allowable residual content ≤0.025
Vanadium V: 0.10~0.20
Molybdenum Mo: 0.20~0.30
â—Mechanical properties:
Tensile strength σb (MPa): ≥1470 (150)
Yield strength σs (MPa): ≥ 1325 (135)
Elongation δ5 (%): ≥7
Section shrinkage ψ (%): ≥ 35
Impact work Akv (J): ≥ 31
Impact toughness value αkv (J/cm2): ≥39(4)
Hardness: ≤ 269HB
Sample size: sample
â— Heat treatment specifications and metallographic organization:
Heat treatment specification: quenching 860 ° C, oil cooling; tempering 460 ° C, oil cooling.
â— Delivery status: Delivery by heat treatment (normalizing, annealing or high temperature tempering) or no heat treatment, the delivery status should be stated in the contract. 
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Chemical composition and mechanical properties of 45CrNiMoVA