PageLink Metal Products (Shanghai) alloy structural steel (domestic alloy structural steel / alloy structural steel) imports 20CrNi3A alloy structural steel / steel plate 20CrNi3A / 20CrNi3A steel bars / 20CrNi3A coil / 20CrNi3A strip / 20CrNi3A steel pipe / 20CrNi3A wire (good Translated Metal Products (Shanghai) Co., Ltd.) 
 20CrNi3A 
 Material: alloy structural steel 
 Grade: 20CrNi3A 
 ● Features and Scope: 
 20CrNi3A good hardenability can be obtained in a large cross-section within a uniform intensity. After quenching and tempering or quenching and tempering at low temperature, good mechanical properties. Good machinability, cold deformation ductility and weldability medium. The formation of white spots, sensitivity, high-temperature tempering have a tendency to temper brittleness. 20CrNi3A used for high load conditions gear, shaft, worm and bolts, pins, etc.. 
 ● chemical composition: 
 Carbon C: 0.17 ~ 0.25 
 Silicon Si: 0.17 ~ 0.37 
 Mn Mn: 0.30 ~ 0.60 
 Sulfur S: ≤ 0.030 
 Phosphorus P: ≤ 0.030 
 Chromium Cr: 0.60 ~ 0.90 
 Ni - Ni: 2.75 ~ 3.25 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): ≥ 980 
 Conditions yield strength σ0.2 (MPa): ≥ 835 
 The elongation δ5 (%): ≥ 10 
 Section shrinkage ψ (%): ≥ 55 
 Impact toughness αku (J/cm2): ≥ 98 
 Hardness: 341 ~ 292HB 
 ● Heat treatment and microstructure: 
 Heat Treatment Specification: 820 ~ 840 ° C oil or warm water quenched +400 ~ 500 ° C tempering, oil or water-cooled. 
 Microstructure: 1) quenching and tempering treatment: tempering sorbite; 2) after carburizing, quenching, tempering at low temperature: tempered martensite. 
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