??????????????????????????????????????

 要: 采用热模拟实验机研究了不同的精轧开轧温度、终轧温度和卷取温度对钢板表面三次氧化铁皮的结构和厚度的影响规律。实验结果表明：随着精轧开轧温度和终轧温度的升高，Fe2O3和Fe3O4在整个铁皮层中的百分量逐渐降低，而FeO层的增长速率较快。氧化铁皮的共析转变普遍存在“迟滞现象”，其中350-500℃是该实验用钢共析转变鼻温区。从高温区快速降温到鼻温区，而后缓慢冷却到室温是避免发生先共析反应、促进共析反应的有效方法之一。在鼻温区以上温度卷取，可获得含有FeO较多的减酸洗钢，此种氧化铁皮有利于酸洗。在鼻温区卷取可获得含有Fe3O4较多的免酸洗钢。这是热连轧钢板表面氧化铁皮的主要两个控制思路。

Analysis of Tertiary Oxide Scale With Different Hot Rolling Processes Parameters

The effort on the structure and thickness of tertiary oxide scale from different initial rolling temperatures,finish rolling temperatures and coiling temperatures was studied using thermal simulation machine.The results showed that with the rising of with initial rolling temperature and finish rolling temperature,the proportion of Fe2O3 and Fe3O4 decreased gradually,while the growth rate of FeO was fast.The hysteresis phenomenon of oxide scale eutectoid is very common,and 350～500 ℃ should be the zone of ＂eutectoid nose temperature＂ for the experimental steel.One of the effective methods to control proeutectoid and promote eutectoid was rapid cooling from high temperature region to ＂nose＂ temperature and slow cooling from ＂nose＂ temperature to room temperature in practical production.Less acid wash steel containing more FeO was obtained with the cooling tempreture above the ＂nose＂ temperature,and this kind of oxide scale was beneficial to pickling.And wash steel acid free containing more FeO was available at the ＂nose＂ tempreture.The above were two main thoughts of controlling hot rolling oxide scale.