论文部分内容阅读
采用Gleeble热模拟试验机和可控气氛石英管式炉研究了不同的精轧开轧温度和终了温度、精轧后冷却速率和冷却气氛对中厚板表面氧化铁皮物相的影响。用X射线衍射(XRD)半定量分析了氧化铁皮中各个物相重量百分含量。试验结果表明:总的来说在870~950℃,随着精轧开轧温度的升高,氧化铁皮中Fe_3O_4相含量逐渐增加,Fe2O3相含量逐渐降低,在930℃时Fe_3O_4相含量达到最高值,因此选择高的精轧开轧温度能减少红锈的产生。精轧后在550℃用氮气冷却,氧化铁皮中没有Fe2O3相,只有Fe_3O_4相,用氮气代替空气冷却中厚板能明显减少中厚板表面红锈的产生。此外,中厚板精轧终了温度和轧后冷却速率对红锈产生的影响也被研究了。
The effects of different hot rolling start temperature and finish temperature, cooling rate after finishing rolling and the cooling atmosphere on the oxide scale phase on the plate were investigated by Gleeble thermal simulation machine and controlled atmosphere quartz tube furnace. The weight percentages of each phase in the scale were analyzed semi-quantitatively by X-ray diffraction (XRD). The results show that the content of Fe 3 O 4 phase in FeO 3 scale gradually increases and the Fe 2 O 3 phase content decreases gradually at 870-950 ℃ with the rolling temperature at finish rolling. The content of Fe 3 O 4 phase reaches the maximum at 930 ℃ , So the choice of high finishing rolling temperature can reduce the production of red rust. After finish rolling, it was cooled with nitrogen at 550 ℃. There was no Fe2O3 phase in the scale and only Fe3O4 phase. Using nitrogen instead of air to cool the plate could obviously reduce the red rust on the plate surface. In addition, the impact of the finishing temperature of plate finishing and the cooling rate after rolling on the red rust has also been studied.