化学成份：牌号化 学 成 份 %CSiMnPSCrNiCu20Mn20.17-0.240.17-0.371.40-1.80≤0.035≤0.035≤0.30≤0.30≤0.3030Mn20.27-0.340.17-0.371.40-1.80≤0.035≤0.035≤0.30≤0.30≤0.3035Mn20.32-0.390.17-0.371.40-1.80≤0.035≤0.035≤0.30≤0.30≤0.30