热轧过程中，不同的轧制工艺和卷取条件会获得不同的氧化铁皮结构。其中，FeO的晶粒是以三角锥型或金字塔型的方式生长，Fe3O4以柱状晶的形式生长，Fe2O3以金属须状方式生长。针对不同结构的氧化铁皮进行酸洗模拟试验，研究热轧带钢不同位置的氧化铁皮的酸洗行为，绘制了不同氧化铁皮结构的酸洗动力学曲线，分析由于供氧差异对氧化铁皮结构和酸洗行为造成的影响；并揭示了两种典型氧化铁皮结构的酸洗机制，以FeO为主的氧化铁皮结构其酸洗机制为“剥离”、化学溶解和相结合，以Fe3O4为主的氧化铁皮结构其酸洗机制以化学溶解为主。
Significant structural differences can be found in oxide scales formed on hot-rolled strip processed under different hot rolling conditions and at different locations in the coil. It was found that wustite crystal grew in the form of triangular pyramidal, and magnetite grew in the form of columnar crystal. Hematite developed in whiskers ways. The pickling simulation experiments on different scales were done to study the acid-pickling behaviors of the oxide scale at different positions in plate width and the pickling kinetics curve was draw, the effect of the differ- ence in oxygen supply in the width direction on the scale structure and acid-pickling behavior of hot-rolled strip were analyzed. There are two different pickling mechanisms of hot-rolled steel strip for the typical structure, one is the combination of ＂stripping＂, chemical dissolve and for FeO, another is chemical dissolve for Fe3O4.
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