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发明公开
CN107099750A 一种高强度Q630GJ钢板及其生产方法 无效 - 撤回

一种高强度Q630GJ钢板及其生产方法
摘要：
本发明公开了一种高强度Q630GJ钢板及其生产方法，所述钢板采用V‑Ni‑Nb‑Ti微合金成分设计，所述微合金化学成分及质量百分含量为：V：0.04～0.045%，Ni：0.35～0.45%，Nb：0.02～0.03%，Ti：0.015～0.025%。生产方法包括轧制工序和热处理工序。本发明通过合理的成分设计、控轧控冷及低温回火工艺，获得良好力学性能的高强钢板，钢板组织为回火铁素体+马氏体+贝氏体，屈强比≤0.83，钢板最大厚度为80mm，实现了调质型低屈强比高强度钢板国产化。
摘要（英）：

The invention discloses a high-strength Q630GJ steel plate and a production method thereof. A V-Ni-Nb-Ti microalloy component design is adopted by the steel plate. The steel plate is prepared from the following microalloy chemical components in percentage by weight: 0.04%-0.045% of V, 0.35%-0.45% of Ni, 0.02%-0.03% of Nb and 0.015%-0.025% of Ti. The production method comprises a rolling procedure and a thermal treatment procedure. Through reasonable component design, controlled rolling and cooling and a low-temperature tempering process, the high-strength steel plate with good mechanical property is obtained. According to the steel plate, the tissue is tempered ferrite+martensite+bainite, the yield ratio is smaller than or equal to 0.83, the maximal thickness of the steel plate is 80mm and the localization of the tempered high-strength steel plate with low yield ratio is achieved.

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