Good translation Metal Products (Shanghai) alloy structural steel companies (domestic alloy steel / alloy steel imports) 20crni alloy structural steel / 20crni steel / 20crni steel bar / 20crni Coil / 20crni steel / 20crni pipe / 20crni wire (good Translation Metal Products (Shanghai) Co., Ltd.) 
 20CrNi 
 Used in the manufacture of large high-load work important carburizing parts such as gears. Key. On the shaft. Piston pin. Splined shaft, etc.; also be used as a high impact toughness of quenched and tempered parts 
 20crni Introduction 
 20CrNi 
 Standard: GB / T 3077-1988 
 Features: 
 Used in the manufacture of large high-load work important carburizing parts such as gears. Key. On the shaft. Piston pin. Splined shaft, etc.; also be used as a high impact toughness of quenched and tempered parts 
 20crni chemical composition 
 ● Chemical Composition: 
 Carbon C: 0.17 ~ 0.23 
 Si Si: 0.17 ~ 0.37 
 Manganese Mn: 0.40 ~ 0.70 
 S allows the residual sulfur content ≤ 0.035 
 P to allow the residual phosphorus content ≤ 0.035 
 Chromium Cr: 0.70 ~ 1.00 Nickel 
 Ni-Ni: 1.00 ~ 1.40 
 Copper Cu: to allow the residual content ≤ 0.030 
 Mechanical properties 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): ≥ 785 (80) 
 Yield strength σs (MPa): ≥ 590 (60) 
 Elongation δ5 (%): ≥ 10 
 Reduction of area ψ (%): ≥ 50 
 Impact energy Akv (J): ≥ 63 
 Impact toughness αkv (J/cm2) ≥ 78 (8) 
 Hardness: ≤ 197HB 
 Sample size: Sample size is 25mm rough 
 Heat treatment specifications 
 ● Heat treatment and microstructure specifications: 
 Heat treatment specifications: 
 Quenching 850 ℃, water, oil cooling; tempering 460 ℃, water-cooled, oil-cooling. 
 ● Delivery status: to heat treatment (normalizing, annealing, or tempering) or heat treatment delivery, delivery status should be indicated in the contract. 
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