C5D2优质碳素结构钢 详细描述: 碳C: ≤0.07 硅Si: ≤0.30 锰Mn:0.30-0.50 磷P: ≤0.020 硫S: ≤0.025 铬Cr: ≤0.10 镍Ni: ≤0.10 鉬Mo:≤0.05 铜Cu:≤0.15 铝Al:≤0.01 氮N: ≤0.007