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采用合金成本低廉的C-Mn-Cr化学成分设计,通过层流冷却段的水冷—空冷—水冷的三段式冷却模式和低温卷取,成功在1 580mm机组上试生产580MPa级热轧双相钢。对试生产钢卷进行了性能均匀性分析,结果表明:除去轧钢头部弱冷区域,整卷性能均匀,马氏体比例可稳定在10%左右。进而得出当前采用的恒速轧制方法有利于热轧双相钢力学性能均匀性控制的结论。试生产中在终轧后实施了2种不同的中间温度,轧制结果显示2种工艺方案下屈服强度和屈强比差距较大。
The C-Mn-Cr chemical composition with low alloy cost was adopted to successfully produce 580MPa-class hot-rolled dual-phase on a 1 580mm unit through a three-stage water cooling, air cooling and water cooling cooling mode and low temperature coiling in the laminar cooling section steel. The analysis of the performance of the pilot production of steel coil uniformity, the results show that: remove the cold rolled head cold region, the whole coil uniform performance, the proportion of martensite can be stabilized at about 10%. And then draw the conclusion that the current constant speed rolling method is in favor of controlling the uniformity of the mechanical properties of the hot-rolled dual-phase steel. In the trial production, two different intermediate temperatures were implemented after the finish rolling. The rolling results showed that the difference between the yield strength and the yield ratio under the two kinds of process schemes was large.