c
质量分数)(%) C:0.26~0.34 Si:0.17~0.37 Mn:0.40~0.70 Cr:0.80~1.10 Mo:0.15~0.25 P:≤0.035 S:≤0.035 Ni:≤0.030 Cu:≤0.030 质量分数)(%) C:0.26~0.34 Si:0.17~0.37 Mn:0.40~0.70 Cr:0.80~1.10 Mo:0.15~0.25 P:≤0.035 S:≤0.035 Ni:≤0.030 Cu:≤0.030 质量分数)(%) C:0.26~0.34 Si:0.17~0.37 Mn:0.40~0.70 Cr:0.80~1.10 Mo:0.15~0.25 P:≤0.035 S:≤0.035 Ni:≤0.030 Cu:≤0.030