热轧板带材表面翘皮缺陷成因与控制研究现状

Research Status on Causes and Control of Warping Defect on Surface of Hot Rolled Plate and Strip

热轧板带表面翘皮一直是困扰高品质钢带材生产的常见缺陷。钢材表面翘皮缺陷的产生原因可能贯穿于钢铁生产冶炼、连铸、热轧和冷轧全过程,翘皮缺陷种类多、影响因素复杂。依据其形貌和组织特征,可将常见翘皮缺陷的诱因分为5类,分别是皮下夹杂、表面裂纹、皮下气泡、氧化皮压入以及中间坯折边。加强生产设备与工序界面管理,尤其是从源头上提高连铸工艺水平,改善铸坯表面质量,可以大大降低产品翘皮缺陷的发生几率。

The warping on surface of hot rolled plate and strip is always the common defect that troubles production of high quality strip.The causes for warping defect on surface of steel could be throughout the whole process of steel production such as smelting,continuous casting,hot rolling and cold rolling.The types of warping defect are various and influencing factors are complex.The causes of common warping defect are classified into 5 types based on their morphology and microstructure characteristics,which are subsurface inclusions,surface cracks,subsurface bubbles,rolled-in scale and edgefold of intermediate billet.The probability of occurrence of warping defect for products could be reduced significantly by enhancing management of production equipment and process interfaces,especially increasing the level of continuous casting process from the origin to improve surface quality of ingot blank.