基于热轧全流程氧化铁皮控制的耐蚀性工艺

针对热轧生产流程实际工况,系统研究了热轧、卷取阶段的三次氧化铁皮演变规律,旨在不增加生产成本的前提下,通过调整热轧生产工艺控制氧化铁皮结构,利用热轧后生成的氧化铁皮作为防护屏障,提高钢材耐蚀性能.结果表明,在不同轧制温度下,三次氧化铁皮结构从外到里分别为Fe2O3、Fe3O4和FeO,由于FeO中的阳离子空位密度大,导...

Corrosion resistance process based on control of oxide scale in whole process of hot rolling

According to the actual working conditions of hot rolling production process,the evolution law of triple oxide iron sheet in hot rolling and coiling stage is systematically studied,aiming at improving the corrosion resistance of steel by adjusting the hot rolling production process to control the structure of oxide iron sheet and using the oxide iron sheet generated after hot rolling as protective barrier without increasing the production cost. The experimental results show that at different rolling temperatures,the structure of tri-oxide iron sheet is Fe₂O₃,Fe₃O₄ and FeO from the outside to the inside,and the proportion of FeO is the largest due to the high density of cation vacancy in FeO. With the increase of rolling temperature,the thickness of FeO layer in the iron sheet is gradually thickened,and the proportion is also gradually increased. By simulating the continuous cooling experiment,it is found that the transformation relationship of the oxide sheet structure is in the form of "C" curve. In the temperature range of 450-550 ℃,the eutectoid reaction degree of FeO reaches the peak,and it can be seen that the eutectoid transformation can be effectively inhibited by coiling at high temperature. A large number of experimental studies have shown that obtaining the structure type of complete oxide sheet with pro-eutectoid Fe₃O₄ is the main control direction to improve the corrosion resistance of hot-rolled steel effectively. So this article in a domestic steel strip production line based on the corrosion resistance of iron oxide control process to try rolling test and salt spray test,the results show that full dense iron oxide,and its structure type is mainly pro-eutectoid Fe₃O₄,so use of rolling technology to adjust the changing structure of the steel plate surface scale,steel corrosion resistant performance is improved significantly