20CrMnMo, execution standard: GB/T3077-1999
20CrMnMo is a grade of alloy structural steel. Unified numerical code: A34202.
Chemical composition, mass fraction (%):
Carbon C: 0.17-0.23
Silicon Si: 0.17-0.37
Manganese Mn: 0.90-1.20
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
Tensile strength (σ b/MPa): ≥ 1180
Yield point (σ s/MPa): ≥ 885
Post fracture elongation (δ 5/%): ≥ 10
Sectional shrinkage rate (ψ/%): ≥ 45
Impact absorption energy (Aku2/J): ≥ 55
Brinell hardness (HBS100/3000) (annealed or high-temperature tempered state): ≤ 217
Delivery status: Delivery shall be made in a heat-treated (normalizing, annealing or high-temperature tempering) or non heat-treated state, and the delivery status shall be specified in the contract.
Application examples
Commonly used for manufacturing large and important carburized parts with high hardness, strength, and toughness (all of which require higher than 15CrMnMo), such as crankshafts, camshafts, connecting rods, gear shafts, gears, and pin shafts, and can also replace 12Cr2Ni4.
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