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40CrNi2Mo

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40CrNi2Mo is one of the alloy structural steels, also called alloy steels, on the basis of high quality carbon structural steel, it is made by properly adding one or several alloy elements (the total content is not more than 5%). After heat treatment bearing parts common quality defects are: hardened microstructure overheating, underheating, quenching cracks, insufficient hardness, heat distortion, surface decarburization, soft points.

Implementation standards: GB / T 3077-2015

Chemical Composition %

C	Si	Mn	S	P	Cr	Ni	Cu	Mo
0.37 - 0.45	0.15 - 0.35	0.50 - 0.80	max 0.030	max 0.025	0.60 - 0.90	1.25 - 1.65	Max 0.025	0.15 - 0.25

Mechanical properties

Tensile strength σb (MPa)	≥980(100)
Yield strength σs (MPa)	≥835(85)
Elongation δ5 (%)	≥12
Section shrinkage rate ψ (%)	≥55
Impact work Akv (J)	≥78
Impact toughness value αkv (J / cm2)	≥98 (10)
Hardness (HB)	≤269

In what applications is 40CrNi2Mo used?

40CrNi2Mo is widely used in ships, vehicles, aircraft, missiles, weapons, railways, bridges, pressure vessels, machine tools and other structures.

Heat treatment specifications

Quenching at 850 ° C, oil cooling; tempering at 600 ° C, water cooling, oil cooling.

Delivery status

Delivery in heat treatment (normalizing, annealing or high temperature tempering) or non heat treatment state, which shall be indicated in the contract.