40CrMnMo chemical composition and mechanical properties, main uses
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40CrMnMo is a grade of alloy structural steel specified by Chinese national standards.
Uniform digital code: A34402.
Chemical composition C: 0.37 to 0.45
Si: 0.17 to 0.37
Mn: 0.90 to 1.20
Cr: 0.90 to 1.20
Mo: 0.20 to 0.30
Mechanical properties [sample blank size] 25mm
[heat treatment]
Quenching heating temperature (°C): 850; coolant: oil tempering heating temperature (°C): 600; coolant: water, oil
[Mechanical properties]
Tensile strength (σb/MPa): ≧980
Yield point (σs/MPa): ≧785
Elongation after break (δ5/%): ≧10
Area shrinkage (ψ/%): ≧45
Impact absorption work (Aku2/J): ≧63
Brinell hardness (HBS100/3000) (annealed or high temperature tempered state): ≦217
The main characteristics of the quenching and tempering treatment have good comprehensive mechanical properties, good hardenability and high tempering stability. Mostly used in quenched and tempered state.
Application examples are often used to manufacture heavy-duty, larger-section gear shafts, gears, rear axle axles for large trucks, shafts, eccentric shafts, connecting rods, and similar parts for steam turbines. They can also be used in place of 40CrNiMo. 
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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