40CrNiMo Alloy round bar,40CrNiMo steel has high strength, toughness and good hardenability and anti-overheating stability, but the white point of high sensitivity, temper brittleness. 40CrNiMo Alloy round bar,40CrNiMo steel's weldability is poor, preheated by high temperature before welding, after welding to eliminate stress, after quenching and after use. General production of high strength, good plastic parts, nitriding after the production of special performance requirements of the important parts, such as shafts, gears, fasteners and so on.
40CrNiMo steel Chemical composition(%)
C ：0.37～0.44 Si：0.17～0.37 Mn：0.50～0.80 S ：≤0.025 P ：≤0.025 Cr：0.60～0.90 Ni：0.9～1.45 Cu：≤0.25 Mo：0.15～0.25
40CrNiMo Alloy round bar Mechanical properties
Tensile strength σb (MPa): 933 ~ 1011
Conditional yield strength σ0.2 (MPa): 832-899
Elongation δ5 (%): 19-20
Sectional shrinkage ψ (%): 53 ~ 64
Impact energy Akv (J): 117
The impact toughness value? Ku (J / cm2): 144 to 172
Hardness: 274 ~ 303HB
Sample size: Smooth sample
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