标准 牌号 化学成分(%)  C Si Mn P S  GB/T5312 320 ≤0.16 ≤0.35 0.40~0.70 ≤0.035 ≤0.035  360 ≤0.17 ≤0.35 0.40~0.80 ≤0.035 ≤0.035  410 ≤0.21 ≤0.35 0.40~1.20 ≤0.035 ≤0.035  460 ≤0.22 ≤0.35 0.80~1.40 ≤0.035 ≤0.030  490 ≤0.23 ≤0.35 0.80~1.50 ≤0.035 ≤0.030    注:残余元素Cr≤0.25%,Mo≤0.10%,Ni≤0.30%,Cu≤0.30%总量≤0.70% 
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