Good translation of the Metal Products (Shanghai) alloy structural steel company (domestic alloy structural steel / imports of alloy structural steel) 20CrMn alloy structural steel / steel plate 20CrMn / 20CrMn steel bars / 20CrMn coil / 20CrMn, steel strip / 20CrMn steel pipe / 20CrMn wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 20CrMn, an alloy structural steel grades of the Chinese national standard. Uniform digital code: A22202. 
 Standard: GB / T 3077-1988 
 Chemical composition 
 Mass fraction (%): 
 Carbon C: 0.17 ~ 0.23 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.90 ~ 1.20 
 Sulfur S: Allow the residual content of ≤ 0.035 
 Phosphorus P: Allow the residual content of ≤ 0.035 
 Chromium Cr: 0.90 ~ 1.20 
 Ni: to allow the residual content of ≤ 0.030 
 Cu: to allow the residual content of ≤ 0.030 
 Mechanical properties 
 [Sample blank dimensions 
 15mm 
 [Heat] 
 Quenching temperature (° C): 850; coolant: Oil 
 Tempering the heating temperature (° C): 200; coolant: water, air 
 Mechanical Properties]. 
 Tensile strength σb (MPa): ≥ 930 (95) 
 Yield strength σs (MPa): ≥ 735 (75) 
 The elongation δ5 (%): ≥ 10 
 Reduction of area ψ (%): ≥ 45 
 Impact energy Akv (J): ≥ 47 
 The impact toughness αkv (J/cm2): ≥ 59 (6) 
 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≦ 187 
 Delivery status: to heat treatment (normalizing, annealing, or high-temperature tempering) or heat treatment state of delivery, the delivery status should be indicated in the contract. 
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