Good translation of the Metal Products (Shanghai) alloy structural steel companies (domestic alloy structural steel / imports of alloy structural steel) 12crni2 alloy structural steel / steel plate 12crni2 / 12crni2 steel bars / 12crni2 coil / 12crni2 strip / 12crni2 steel pipe / 12crni2 wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 12CrNi2 
 Alloy structural steel 
 Standard: GB / T 3077-1988 
 Chemical composition 
 ● chemical composition: 
 Carbon C: 0.10 ~ 0.17 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.30 ~ 0.60 
 Sulfur S: Allow the residual content of ≤ 0.035 
 Phosphorus P: Allow the residual content of ≤ 0.035 
 Chromium Cr: 0.60 ~ 0.90 
 Ni - Ni: 1.50 ~ 1.90 
 Cu: to allow the residual content of ≤ 0.030 
 Mechanical properties 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): ≥ 785 (80) 
 Yield strength σs (MPa): ≥ 590 (60) 
 Elongation δ5 (%): ≥ 12 
 Section shrinkage ψ (%): ≥ 50 
 Impact energy Akv (J): ≥ 63 
 Impact the toughness the value αkv (J/cm2): ≥ 78 (8) 
 Hardness: ≤ 207HB 
 Sample size: sample blank size is 15mm 
 ● Heat treatment and microstructure: 
 The specification of the heat treatment: quenching: the first 860 ℃, the second 780 ° C, water cooling, oil cooling; tempering 200 ° C, water-cooled, air-cooled. 
 ● characteristics of the application: 
 Advanced carburizing steel after quenching and low temperature tempering or high-temperature tempering has good mechanical properties, good low temperature impact toughness, notch sensitivity, machinability and weldability is still good, but the temper brittleness, white point higher sensitivity, be subject to a secondary hardening after carburizing, special circumstances require a cold treatment. 
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