40CrNiMo alloy steel, 40CrNiMoA is the meaning of high-quality combined structural steel, also known as alloy steel, it is on the basis of high-quality carbon structural steel, appropriate to add one or several alloying elements (total content does not exceed 5%) and made of steel, with high strength, high toughness, good permeability and anti-overheating stability. The general specifications are forging steel plate, hot rolled round steel, wire, etc., generally after tempering the use effect is significantly improved.
Chemical composition:
Carbon C :0.37~0.44
Silicon Si:0.17~0.37
Manganese Mn:0.50~0.80
Sulfur S :≤0.025
P :≤0.025
Chromium Cr:0.60~0.90
Nickel :1.25~1.65
Copper Cu:≤0.25
Molybdenum Mo:0.15~0.25
Mechanical properties:
Tensile strength σb (MPa):≥980
Yield strength σs (MPa):≥835
Elongation δ5 (%):≥12
Section shrinkage ratio ψ (%):≥55
Impact power Aku (J):≥78
Impact toughness value αkv (J/cm²) A: 98 or more
Uses: Used for high strength, high toughness, large section size and more important tempering parts, such as horizontal forging machine transmission eccentric shaft, forging press crankshaft and so on. After tempering, it is used to make important parts requiring good plasticity, high strength and large size. If the heavy machinery in the high-load shaft, diameter greater than 250mm turbine shaft, blade, high-load transmission parts, fasteners, crankshaft, gear, etc. In addition, it can also be nitrided to make important parts with special performance requirements.
