化学成分:
碳 C :0.52~0.60硅 Si:0.17~0.37锰 Mn:0.65~0.95硫 S :≤0.030磷 P :≤0.030铬 Cr:0.65~0.95镍 Ni:≤0.35铜 Cu:≤0.25钒V:0.10~0.20