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发明公开
CN104178692A 抗拉强度≥1200MPa的工程机械用易切削钢及生产方法 有权 转让

抗拉强度≥1200MPa的工程机械用易切削钢及生产方法
摘要：
抗拉强度≥1200MPa的工程机械用易切削钢，其组分及wt%为：C：0.30～0.50%、Si：0.40～0.60%、Mn：1.2～1.5%、P≤0.015%、S≤0.015%、N：0.03～0.05%、B：0.01～0.02%、Al：0.01～0.03%、Nb：0.01～0.03%、Ti：0.01～0.03%；生产步骤：冶炼并成坯；将方坯加热；热轧；穿水冷却；坑冷。本发明无环境污染，成分简单，成本相对较低，抗拉强度≥1200MPa，屈服强度≥850MPa、延伸率A≥15%、断面收缩率Z≥20%，且兼具优良切削性能。
摘要（英）：

The invention discloses free cutting steel with tensile strength of not less than 1200MPa for engineering machinery. The free cutting steel comprises the following components in percentage by weight: 0.30%-0.50% of C, 0.40%-0.60% of Si, 1.2%-1.5% of Mn, not more than 0.015% of P, not more than 0.015% of S, 0.03%-0.05% of N, 0.01%-0.02% of B, 0.01%-0.03% of Al, 0.01%-0.03% of Nb and 0.01%-0.03% of Ti. A production method of the free cutting steel comprises the following steps: smelting and forming billets; heating the square billets; hotly rolling; cooling by water; cooling in holes. The free cutting steel is free of environmental pollution, simple in component, relatively low in cost and excellent in cutting performance, and has the tensile strength of not less than 1200MPa, the yield strength of not less than 850MPa, the elongation rate A of not less than 15% and the cross section reduction rate Z of not less than 20%.

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