Min. Order: 10
20CrNiMo
alloy steel
nickly steel
alloy structural steel：20CrNiMo
standard：GB/T 3077-1988
●Chemical composition：
碳 C ：0.17～0.23
硅 Si：0.17～0.37
锰 Mn：0.60～0.95
硫 S ：allow remains content≤0.035
磷 P ：allow remains content≤0.035
铬 Cr：0.40～0.70
镍 Ni：0.35～0.75
铜 Cu：allow remains content≤0.030
钼 Mo：0.20～0.30
●mechanical properties：
tensile strength σb (MPa)：≥980(100)
yield strength σs (MPa)：≥785(80)
extensibility δ5 (％)：≥9
reduction of area ψ (％)：≥40
ballistic work Akv (J)：≥47
notched bar impact strength αkv (J/cm2)：≥59(6)
rigidity ：≤197HB
specimen size：specimen size of rough 15mm
●heat treatment regime and metallurgical structure：
heat treatment regime ：quenching 850℃,oil cooling ;backfire200℃,air cooling .
●deliver position ：heat treatment（normalizing、annealing or high-temperature backfire）or no heat treatment, this should be shown on the contract.

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