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发明公开
CN104711488A 大厚度F690级海洋工程用高强钢板及其生产方法 有权

大厚度F690级海洋工程用高强钢板及其生产方法
摘要：
本发明公开了一种大厚度F690级海洋工程用高强钢板及其生产方法，其包括冶炼、浇铸、加热、轧制和热处理工序，所述钢板化学成分的质量百分含量为：C 0.08%～0.13%、Si 0.10%～0.30%、Mn 1.0%～1.20%、P≤0.010%、S≤0.003%、Ni 0.5%～2.5%、Cr 0.50%～1.0%、Mo 0.30%～0.50%、Nb 0.020%～0.050%、V 0.04%～0.06%、B 0.0005～0.0015%、TAl 0.040%～0.070%，余量为Fe和不可避免的杂质；所述轧制工序采用晾钢轧制，热处理工序采用淬火＋回火工艺。本方法通过调整优化钢板中合金元素的配比，能在低碳当量条件下确保钢板力学性能良好，使钢板具有良好的组织、综合性能和焊接性能；采用晾钢轧制工艺，低温韧性有相当大的富裕量；采用淬火+回火的热处理工艺，得到钢板组织以马氏体为主，并含有少量贝氏体的复合组织，钢板组织均匀细小。
摘要（英）：

The invention discloses a large-thickness high-strength steel plate for F690 ocean engineering and a manufacturing method of the steel plate. The manufacturing method comprises the procedures of smelting, casting, heating, rolling and heat treating. The steel plate comprises the following chemical ingredients by mass percentage: 0.08-0.13% of C, 0.10-0.30% of Si, 1.0-1.20% of Mn, no more than 0.010% of P, no more than 0.003% of S, 0.5-2.5% of Ni, 0.50-1.0% of Cr, 0.30-0.50% of Mo, 0.020-0.050% of Nb, 0.04-0.06% of V, 0.0005-0.0015% of B, 0.040-0.070% of TAl and the balance of Fe and inevitable impurities. In the rolling procedure, the hanging steel rolling technology is adopted; the quenching and tempering technology is adopted in the heat treating procedure. By adjusting and optimizing the ratio of alloy elements in the steel plate, the manufacturing method can ensure that the steel plate is excellent in mechanical property under the low carbon equivalent condition, so that the steel plate is excellent in structure, good in comprehensive performance and good in welding performance; by adopting the hanging steel rolling technology, the steel plate is considerably rich in low-temperature tenacity; by adopting the quenching and tempering technology in the heat treating procedure, the obtained steel plate mainly takes the martensite structure along with a few bainite complex structure, and the steel plate is uniform and fine in structure.

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