合金结构钢:40CrNiMoA 标准:GB/T 3077-1988 ●化学成份:碳 C :0.37~0.44 硅 Si:0.17~0.37 锰 Mn:0.50~0.80 硫 S :允许残余含量≤0.025 磷 P :允许残余含量≤0.025 铬 Cr:0.60~0.90 镍 Ni:1.25~1.65 铜 Cu:允许残余含量≤0.025 钼 Mo:0.15~0.25
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