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发明公开
CN107475634A 低成本FH460级船舶及海洋工程结构钢及其生产方法 无效 - 驳回

低成本FH460级船舶及海洋工程结构钢及其生产方法
摘要：
一种低成本FH460级船舶及海洋工程结构钢，钢中各元素的质量百分比为：C0.04～0.08，Mn1.30～1.70，Nb0.040～0.065，Ti0.010～0.030，Cr0.15～0.30，Als≥0.015，其它为Fe和不可避免的杂质。采用控轧方式轧制，开轧温度930～1050℃；一阶段终轧温度＞950℃；二阶段开轧温度≤920℃，二阶段开轧时待温厚度为钢板成品厚度的2.5倍以上，精轧累计压下率≥60%，终轧温度790～860℃；采用DQ+ACC控制冷却，钢板开冷温度780～810℃，终冷温度200～400℃，冷却时间在30s以下。本发明可实现低成本生产满足国标的船舶及海洋工程结构钢。
摘要（英）：

Disclosed is low-cost FH460 grade ship and marine engineering structural steel. The steel comprises, by mass, 0.04-0.08% of C, 1.30-1.70% of Mn, 0.040-0.065% of Nb, 0.010-0.030% of Ti, 0.15-0.30% of Cr, larger than or equal to 0.015% of Als, and the balance Fe and inevitable impurities. The steel is rolled by using a control rolling mode, the starting rolling temperature is 930-1050 DEG C, the first stage finishing rolling temperature is greater than 950 DEG C, the second stage starting rolling temperature is equal to or greater than 920 DEG C, the temperature-holding thickness is more than two and a half times of the thickness of steel products during second stage starting rolling, the cumulative reduction rate of precision rolling is equal to or greater than 60%, the finishing rolling temperature is 790-860 DEG C, cooling is controlled by using DQ and ACC, the starting cooling temperature is 780-810 DEG C, the finishing cooling temperature is 200-400 DEG C, and the cooling time is under 30 s. By means of the low-cost FH460 grade ship and marine engineering structural steel, the fact that low-cost production meets international ship and marine engineering structural steel is achieved.

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