材料期刊网

某酸轧机组在生产双相钢时发现冷硬卷表面有条纹缺陷,为确认条纹的来源和构成,跟踪生产了两批双相钢.利用电子显微镜观察酸洗前后带钢表面条纹区域和非条纹区域的形貌和成分,结果发现,酸洗后带钢表面的条纹和热轧卷表面的条纹具有相似的成分构造和形貌.追溯分析,判定条纹产生于炼钢机械火焰清理板坯表面的过程中.当火焰清理发生漏清现象时,残留的氧化层随热轧轧制过程被压碎裹入带钢后形成条纹,条纹处严重的氧化层在酸洗过程中无法彻底消除,导致冷硬卷降级,还会损伤轧辊,对酸轧批量稳定生产双相钢造成非常严重的影响.

There was some stripe on the surface of chill roll during the production of the dual phase high-strength steel in a sour rolling mill.In order to confirm the source and constitution of the stripe,it tracked the production process of the dual phase steel two times.The morphology and component of the stripe region and non-stripe region before and after pickling were observed by the electron microscope.It found that the morphology and component of the stripe on the steel surface after pickling was similar to that of the hot rolled stripe.The retrospective analysis showed that the stripe was produced during the machine flame clearing the surface of the slab in the steel-making workshop.When there were some omissions for flame clearing,the residual oxidation layers were crushed and wrapped in the strip steel during the hot rolling process and then formed the stripe.The thick oxide layer of the stripe cannot be eliminated thoroughly during the acid pickling,which can cause the downgrade of the chill roll,be harmful to the roll,and also have serious impacts on the batch production of the dual phase steel in the acid rolling.