减少冷轧IF钢表面条痕缺陷的生产实践

来源期刊：钢铁2010年第9期

论文作者：曾建华 吴国荣 陈永 杨素波 杨金成 赵克文

文章页码：44 - 47

关键词：IF钢； 条痕缺陷； 连铸保护渣； 精炼工艺

Key words：interstitial free(IF) steel； faint-sliver defect； mold powder； refining process

摘    要：针对攀钢IF钢冷轧板出现的条痕缺陷,在对冷轧板、热轧板及铸坯取样分析的基础上,得出铸坯皮下微裂纹、浇铸过程保护渣卷渣以及铸坯中的夹杂物是IF钢冷轧板条痕缺陷产生的主要原因。通过采取降低钢包顶渣氧化性、控制渣中w(CaO)/w(Al₂O₃)比值,延长RH脱氧合金化后的循环时间、控制铸机拉速及提高保护渣黏度等技术措施后,冷轧板的条痕缺陷得到了有效控制,因条痕缺陷引起的降级改判率由10.97%降至1.00%以下。

Abstract: The sample of cold-rolled plates,hot-rolled plates and slab were analyzed with the condition of faint-sliver defects appeared in IF steel of Panzhihua Steel,and it was shown that faint-sliver defects in cold-rolled steel sheet were mainly caused by microcrack under the skin of strands,slag entrapment in mold during casting and inclusions in slab during rolling with the analysis on cold-rolled plates,hot-rolled plates and slab in Panzhihua Steel.Faint-sliver defects were controlled effectively with the technical measures,which were decreasing oxidation of ladle slag,controlling the ratio of w(CaO)/w(Al₂O₃) in slag,extending circulation time of deoxidization and alloying in RH furnace,controlling the casting speed and increasing the viscosity of mold fluxes.Therefore,the ratio of downgrade induced by faint-sliver defects reduced from 10.97% to 1.00%.