摘要
通过扫描电镜对SUH409L铁素体不锈钢冷轧板表面缺陷进行了分析,发现该缺陷是由CaO·TiO2-MgO·Al2O3的复合夹杂物引起;对冶炼过程夹杂物的变化规律进行了分析,此类夹杂物主要是炼钢过程的氧化产物。钢液脱氧产物在水口内壁上附着,在钢水冲刷作用下进入结晶器中,被凝固坯壳捕捉。在轧制过程中,这些皮下夹杂在冷轧板表面形成缺陷。从夹杂物的产生机理看,可以通过控制钢中的铝含量来降低炉渣的氧化性避免钛的氧化,从而减少钢中CaO·TiO2-MgO·Al2O3夹杂物的生成来改善冷板表面质量。通过工艺优化,冷轧板翘皮缺陷比例从1.294%降为0.259%。
The surface defects of cold-rolled SUH409L stainless steel sheet were analyzed by scanning electron microscope. The results indicate that the defects are caused by complicate oxides of CaO·TiO2-MgO·Al2O3. Analysis of the rules of inclusion evolve, these inclusions were deoxidation products during the steelmaking. The deoxidation products which attached to the inner wall of the nozzle as the affect of molten steel flowing were captured by the solidification slab shell in the mold. The defects were caused by these subsurface inclusions during the cold rolled process. The formation of CaO·TiO2-MgO·Al2O3 inclusions can be prevented by controlling the appropriate content of aluminum in steel from the point of the mechanism of the inclusion formation, which can reducing the slag oxidizability and avoiding oxidation of titanium in steel. By the way of optimization of steelmaking process, the proportion of cold rolled laminated defects decreased from 1. 294 % to 0. 259 %.
出处
《炼钢》
CAS
北大核心
2014年第4期57-60,共4页
Steelmaking
关键词
夹杂物
SUH409L不锈钢
冷轧板
连铸
inclusion
SUH409L stainless steel
eold-roll sheet
continuous casting
