20CrMnMo chemical composition and mechanical properties, main uses
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20CrMnMo is a grade of alloy structural steel specified by Chinese national standards.
Unified digital code: A34202.
Chemical composition carbon C: 0.17～0.23
Silicon Si: 0.17~0.37
Manganese Mn: 0.90 to 1.20
Sulfur S: Allowable residual content ≤0.035
Phosphorus P: Allowable residual content ≤0.035
Chromium Cr: 1.10~1.40
Nickel Ni: Allowable residual content ≤0.030
Copper Cu: Allowable residual content ≤0.030
Molybdenum Mo: 0.20~0.30
Mechanical properties [sample blank size] 15mm
[heat treatment]
Quenching heating temperature (°C): 850; coolant: oil tempering heating temperature (°C): 200; coolant: water, air
[Mechanical properties]
Tensile strength (σb/MPa): ≧1180
Yield point (σs/MPa): ≧885
Elongation after break (δ5/%): ≧10
Area shrinkage (ψ/%): ≧45
Impact absorption work (Aku2/J): ≧55
Brinell hardness (HBS100/3000) (annealed or high temperature tempered state): ≦217
Delivery status: delivered by heat treatment (normalizing, annealing or high temperature tempering) or without heat treatment, the delivery status should be stated in the contract.
High-strength, high-grade carburized steel with the main characteristics. The strength is higher than 15CrMnMo, the plasticity and toughness are slightly lower, the hardenability and mechanical properties are higher than that of 20CrMnTi. After quenching and low temperature tempering, it has good comprehensive mechanical properties and low temperature impact toughness. After carburizing and quenching, it has high flexural strength and wear resistance, but cracks are easily generated during grinding. Poor weldability, suitable for resistance welding, preheating before welding, tempering after welding. Good machinability and hot workability.
Application examples are often used to manufacture high-strength carburizing parts with high hardness, high strength and high toughness (all of which are higher than 15CrMnMo), such as crankshaft, camshaft, connecting rod, gear shaft, gear, pin, and can also replace 12Cr2Ni4. use. 
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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