成 份 标 准 HT100 HT150 C 3.2~3.8 3.0~3.7 S ≤0.15 ≤0.12 Mn 0.5~0.8 0.5~0.8 P ＜0.3 ＜0.2 Si 2.1~2.7 1.8~2.4 HT200 3.0~3.6 ≤0.12 0.6~1.0 ＜0.15 1.4~2.2 HT250 2.9~3.5 ≤0.12 0.7~1.1 ＜0.15 1.2~2.0 HT300 2.8~3.4 ≤0.12 0.8~1.2 ＜0.15 HT350 2.7~3.2 ≤0.12 0.8~1.4 ＜0.15
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