冷轧薄板线状缺陷控制工艺研究
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- 英文论文题名：Countermeasures for Sliver Defects in Cold Rolled Steel Sheets
- 论文作者：邓小旋 ; 季晨曦 ; 潘宏伟 ; 王胜东 ; 关顺宽 ; 单庆林 ; 李林平 ; 黄福祥
- 英文论文作者：Deng Xiaoxuan ; Ji Chenxi ; Pan Hongwei ; Wang Shengdong ; Guan Shunkuan ; Shan Qinglin ; Li Linping ; Huang Fuxiang ; Shougang Research Institute of Technology ; Shougang Jingtang United Iron & Steel Co. ; Ltd ; School of Metallurgical &Ecological Engineering ; University of Science & Technology Beijing
- 年：2016
- 作者机构：首钢技术研究院薄板研究所;首钢京唐钢铁联合有限责任公司;北京科技大学冶金与生态工程学院;
- 论文关键词：冷轧薄板 ; 线状缺陷 ; 顶渣改质 ; 双股流 ; 钩状坯壳
- 英文论文关键词：Cold rolled Sheets ; slivers defects ; slag reduction treatment ; double roll flow ; hooks
- 会议召开时间：2016-05-19
- 会议录名称：第十九届（2016年）全国炼钢学术会议大会报告及论文摘要集
- 语种：中文
- 分类号：TF703;TG335.55
- 学会代码：ZGJS
- 会议名称：第十九届（2016年）全国炼钢学术会议
- 会议地点：中国湖南长沙
- 主办单位：中国金属学会炼钢分会
- 学会名称：中国金属学会
- 页数：1
- 文件大小：55k
- 原文格式：O
- 会议级别：全国
摘要
本文以某钢厂开展冷轧薄板线状缺陷控制工艺攻关为背景,开展了文献调研、轧板缺陷检测分析与现场试验。研究发现引起冷轧薄板缺陷的夹杂物主要是氧化铝和保护渣,且缺陷主要由铸坯表层5mm内的大尺寸夹杂物轧制而成。提出冷轧板缺陷控制工艺关键点(本文仅列3项):(1)钢包顶渣改质:顶渣改质实质为降低钢/渣界面氧活度,降低其向钢水供氧能力;(2)结晶器内双股流控制:基于水模型和工业试验,提出控制临界吹气量得到结晶器内钢水流态为双股流;(3)中间包钢水过热度控制:适当提高过热度可减少钩状坯壳深度,减轻其捕获夹杂物数量。基于以上措施,该厂炼钢缺陷导致降级率由1.1%降至0.6%。
Based on the technical research program of sliver defects in a steel plant in China,this paper covers the literature review,analysis of slivers of rolled sheets and plant trials in this plant.The results show that alumina and mold powder primarily account for the slivers defect in this mill and the location of these inclusions are trapped in the first mm of the solidified shell in the upper part of the mold.Various procedure parameters to reduce the defect are suggested(only list 3 suggestions in this paper):(1) Reduction of ladle slag:the aim of deoxidizing ladle slag is to decrease the oxygen activity in steel/slag interface,and thus eliminate the capacity to supply the oxygen to the steel.(2) Control the double roll flow in the mold:obtaining the DRF through lessening the gas flow rate;(3) Increase the superheat in tundish:high superheat melt can retard the solidification front and decrease the hook depth,thus improve the surface quality of slabs.The degradation ratio drop from 1.1%to 0.6%after applying these countermeasures.
Based on the technical research program of sliver defects in a steel plant in China,this paper covers the literature review,analysis of slivers of rolled sheets and plant trials in this plant.The results show that alumina and mold powder primarily account for the slivers defect in this mill and the location of these inclusions are trapped in the first mm of the solidified shell in the upper part of the mold.Various procedure parameters to reduce the defect are suggested(only list 3 suggestions in this paper):(1) Reduction of ladle slag:the aim of deoxidizing ladle slag is to decrease the oxygen activity in steel/slag interface,and thus eliminate the capacity to supply the oxygen to the steel.(2) Control the double roll flow in the mold:obtaining the DRF through lessening the gas flow rate;(3) Increase the superheat in tundish:high superheat melt can retard the solidification front and decrease the hook depth,thus improve the surface quality of slabs.The degradation ratio drop from 1.1%to 0.6%after applying these countermeasures.
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