40Cr钢的化学成分(GB/T3077-1999)C:0.37~0.45Si:0.17~0.37Mn:0.50~0.80Cr:0.80~1.10S:≤0.030P:≤0.030Ni:≤0.25Cu:≤0.03040Cr钢的物理性能和力学性能见上传文件。附件:40Ni钢的物理性能.rar