Good translation Metal Products (Shanghai) alloy structural steel companies (domestic alloy steel / alloy steel imports) 20crmnsi alloy structural steel / 20crmnsi steel / 20crmnsi steel bar / 20crmnsi Coil / 20crmnsi steel / 20crmnsi pipe / 20crmnsi wire (good Translation Metal Products (Shanghai) Co., Ltd.) 
 20CrMnSi 
 20CrMnSi, is a Chinese national standard alloy steel grades. Unified digital code: A24202. 
 Standard: GB / T 3077-1988 
 Chemical composition: 
 Carbon C: 0.17 ~ 0.23 
 Si Si: 0.90 ~ 1.20 
 Manganese Mn: 0.80 ~ 1.10 
 Sulfur S: to allow the residual content of ≤ 0.035 
 Phosphorus P: allow the residual content ≤ 0.035 
 Chromium Cr: 0.80 ~ 1.10 
 Ni: to allow the residual content of ≤ 0.030 
 Copper Cu: to allow the residual content ≤ 0.030 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): ≥ 785 (80) 
 Yield strength σs (MPa): ≥ 635 (65) 
 Elongation δ5 (%): ≥ 12 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 55 
 Impact toughness αkv (J/cm2): ≥ 69 (7) 
 Brinell hardness (HBS100/3000) (annealing or tempering condition): ≦ 207 
 Sample size: Sample size is 25mm rough 
 Heat treatment and microstructure specifications: 
 Standard heat treatment: quenching 880 ℃, oil cooling; tempering 480 ℃, water-cooled, oil-cooling. 
 Microstructure: Tempered sorbite + acicular ferrite. 
 Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract. 
 Key Features 
 High strength and toughness, high cold plastic deformation processing, stamping better performance, suitable for cold drawn, cold rolled and other processes. Better welding performance, low hardenability, tempering brittle, generally not used for carburizing or heat treatment. Necessary, can also be used after quenching and tempering. 
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