Good translation of the Metal Products (Shanghai) alloy structural steel alloy structural steel in (Domestic alloy structural steel / imports of alloy structural steel) 20cr2ni4a / 20cr2ni4a steel plate / 20cr2ni4a steel bars / 20cr2ni4a coil / 20cr2ni4a strip / 20cr2ni4a steel pipe / 20cr2ni4a wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 20Cr2Ni4A 
 Material: alloy structural steel 
 Grade: 20Cr2Ni4A 
 ● Features and Scope: 
 20Cr2Ni4A high-quality alloy steel, high strength, toughness and hardenability. Not direct quenching after carburizing in order to reduce the surface retained austenite. Cutting and cold-deformation plasticity. Poor weldability, before welding, preheating to about 150 ° C, the sensitivity of hours white spots, a tendency to temper brittleness. 20Cr2Ni4A for large cross-section carburizing, such as large gears, shafts, and require high strength, good toughness of quenched and tempered parts. 
 ● chemical composition: 
 Carbon C: 0.17 ~ 0.23 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.30 ~ 0.60 
 Sulfur S: ≤ 0.03 
 Phosphorus P: ≤ 0.03 
 Chromium Cr: 1.25 ~ 1.65 
 Ni - Ni: 3.25 ~ 3.65 
 ● Mechanical Properties: 
 Σb (MPa), tensile strength: 1483 
 Conditions yield strength σ0.2 (MPa): 1 292 
 The elongation δ5 (%): 13 
 Section shrinkage ψ (%): 57 
 Impact the toughness the value αkv (J/cm2): 75 
 Hardness: 434HB 
 Sample size: a test material 
 ● Heat treatment and microstructure: 
 Heat Treatment Specification: 880 ° C oil quenching +780 ° C oil quenching, 200 ℃ tempering. 
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