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发明公开
CN103741079A 一种超高强度海洋工程用钢板及其生产方法 无效 - 撤回

一种超高强度海洋工程用钢板及其生产方法
摘要：
本发明提供一种超高强度海洋工程用钢板及其生产方法，其化学成分wt%含量为：C0.06-0.12%，Si0.20-0.35%，Mn1.0-1.6%，P≤0.02%，S≤0.05%，Mo0.40-0.45%，Ni0.30-0.40%，Cu0.20-0.30%，Ti0.012-0.020%，V0.02-0.05%，Nb0.01-0.04%。加热温度1170-1220℃，加热时间90-110min/mm；开轧温度＞1100℃，二阶段开轧温度790-830℃，终轧温度770-810℃；控冷入水温度760-780℃，冷却速度4-10℃/s，返红温度480-540℃；淬火温度890-930℃，在炉时间2-2.5min/mm；回火温度610-650℃，在炉时间4-5min/mm。处理后钢板各项性能指标均达到550MPa级超高强度海洋工程用钢板的标准要求，Rp0.2达到754MPa，Rm为799MPa，A为20.25%。
摘要（英）：

The invention provides a super-strength steel plate for oceanographic engineering and a production method thereof. The steel plate comprises the chemical components in percentage by weight: 0.06-0.12 percent of C, 0.20-0.35 percent of Si, 1.0-1.6 percent of Mn, not more than 0.02 percent of P, not more than 0.05 percent of S, 0.40-0.45 percent of Mo, 0.30-0.40 percent of Ni, 0.20-0.30 percent of Cu, 0.012-0.020 percent of Ti, 0.02-0.05 percent of V and 0.01-0.04 percent of Nb. The heating temperature is 1170-1220 DEG C, the heating time is 90-110 min/mm, the initial rolling temperature is more than 1100 DEG C, the two-stage initial rolling temperature is 790-830 DEG C, the final rolling temperature is 770-810 DEG C; the controlled-cooling water entering temperature is 760-780 DEG C, the cooling speed is 4-10DEG C/s, the re-reddening temperature is 480-540 DEG C, the quenching temperature is 890-930 DEG C, the in-furnace time is 2-2.5min/mm; and the tempering temperature is 610-650 DEG C, and the in-furnace time is 4-5min/mm. All performance indexes of a treated steel plate all reach a standard requirement of a 550MPa-level super-strength steel plate for oceanographic engineering, namely, Rp0.2 reaches 754MPa, Rm reaches 799MPa, and A is 20.25 percent.

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