不同As含量的Ti微合金化IF钢热轧板酸洗行为研究

借助XRD、OM、SEM及EDS等分析手段,对残余元素As含量不同的Ti微合金化IF钢热轧板氧化铁皮的表面形貌、结构、厚度及微区成分进行表征,重点研究了As含量对热轧板酸洗行为的影响。结果表明,As含量对该Ti微合金化IF钢热轧板表面氧化铁皮形貌、组成及厚度影响较小;但相同酸洗条件下,热轧板试样酸洗速度随钢中As含量的增加而下降,这是因为高As含量热轧板表面在酸洗时易形成絮状物,进而降低了热轧板酸洗效率。对于给定的热轧板,建议在Ti微合金化钢生产过程中,应将As含量控制在0.0055%以内,这将有利于提高其表面质量。

Acid pickling behavior of hot rolled Ti-microalloyed IF steel plate with different As contents

The morphology, structure, thickness and micro-area composition of the oxide scale of hot rolled Ti-microalloyed IF steel plate with different As contents were characterized by means of XRD, OM, SEM and EDS. Based on those observations, the effects of As content on the acid pickling behavior of the investigated steels were studied. The results show that As content has little influence on the morphology, structure and thickness of the oxide scale of the investigated plates. However, under the same pickling conditions, the acid pickling rate decreases with the increase of As content in steel. The reason is that floccules are easily formed on the surface of hot rolled plate with high As content, thereby reducing its acid pickling efficiency. For a given hot-rolled plate, it is recommended that the As content should be controlled below 0.0055% during the production of Ti microalloyed steel, which will contribute to the improvement of surface quality.