20CrNi3A Material Name: Alloy structural steel 

 Grade: 20CrNi3A 

 ● Features and Scope: 20CrNi3A good hardenability, in a large cross-section within the scope of uniform strength. Quenched or quenching and tempering, the good mechanical properties. Good machinability, cold plastic deformation and welding of medium. With the sensitivity of the formation of white spots, when high-temperature tempering temper brittleness tendency. 20CrNi3A for work under high load conditions, gear, shaft, worm and bolts, pins, etc. 
 20CrNi3A alloy steel 
 ● Chemical Composition: C: 0.17 ~ 0.25 Si Si: 0.17 ~ 0.37 Manganese Mn: 0.30 ~ 0.60 S S: ≤ 0.030 P P: ≤ 0.030 Cr-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 Elongation δ5 (%): ≥ 10 Reduction of ψ (%): ≥ 55 impact toughness αku (J/cm2): ≥ 98 Hardness: 341 ~ 292HB ● Heat treatment and microstructure specifications: heat treatment specification: 820 ~ 840 ℃ oil or warm water quenching +400 ~ 500 ℃ tempered, oil or water. Microstructure: 1) quenched: tempering sorbite; 2) after carburizing quenching, tempering: tempered martensite