Good translation of the Metal Products (Shanghai) alloy structural steel companies (domestic alloy structural steel / imports of alloy structural steel) 12cr2ni4 alloy structural steel / steel plate 12cr2ni4 / 12cr2ni4 steel bars / 12cr2ni4 coil / 12cr2ni4 strip / 12cr2ni4 steel pipe / 12cr2ni4 wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 12Cr2Ni4 
 Standard: GB / T 3077-1988 
 ● Features and Scope: 
 High strength, good toughness, good hardenability carburizing the surface layer hardness and wear resistance, cold deformation 
 Good plasticity, the cutting is still good, but the white point of sensitivity and temper brittleness, poor weldability. For high-load, 
 Alternating stress under large carburized parts, such as the high-load a variety of gear, worm gear, worm shaft and other mechanical 
 Structural parts. 
 ● chemical composition: 
 Carbon C: 0.10 ~ 0.16 
 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: 1.25 ~ 1.65 
 Ni - Ni: 3.25 ~ 3.65 
 Cu: to allow the residual content of ≤ 0.030 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): ≥ 1080 (110) 
 Yield strength σs (MPa): ≥ 835 (85) 
 The elongation δ5 (%): ≥ 10 
 Section shrinkage ψ (%): ≥ 50 
 Impact energy Akv (J): ≥ 71 
 Impact the toughness the value αkv (J/cm2): ≥ 88 (9) 
 Hardness: ≤ 269HB 
 Sample size: sample blank size is 15mm 
 ● Heat treatment and microstructure: 
 The specification of the heat treatment: quenching: the first 860 ℃, the second 780 ℃, oil cooling; tempering 200 ° C, water-cooled, air-cooled. 
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