论文部分内容阅读
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 SUH409L ferritic stainless steel cold rolled plate were analyzed by scanning electron microscopy. It was found that the defects were caused by the composite inclusions of CaO · TiO2-MgO · Al2O3. The variation of inclusions in the smelting process was analyzed. Inclusions are mainly the oxidation products of the steelmaking process. The molten steel deoxidation product is attached to the inner wall of the nozzle, enters the mold under the action of molten steel and is captured by the solidified shell. In the rolling process, these subcutaneous inclusions in the cold rolled sheet surface defects. From the mechanism of inclusions generation, the surface quality of cold plate can be improved by controlling the aluminum content in steel to reduce the oxidation of slag and avoid the oxidation of titanium, thereby reducing the formation of CaO · TiO2-MgO · Al2O3 inclusions in steel. Through the process optimization, the proportion of cold-rolled veneer defects decreased from 1.294% to 0.259%.