Article(id=1187669714034634882, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1187669711266394222, articleNumber=1009-5438(2025)02-0039-05, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1717603200000, receivedDateStr=2024-06-06, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1761092125662, onlineDateStr=2025-10-22, pubDate=1745510400000, pubDateStr=2025-04-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1761092125662, onlineIssueDateStr=2025-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1761092125662, creator=13701087609, updateTime=1761092125662, updator=13701087609, issue=Issue{id=1187669711266394222, tenantId=1146029695717560320, journalId=1185652524569653253, year='2025', volume='51', issue='2', pageStart='1', pageEnd='98', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1761092125001, creator=13701087609, updateTime=1761096958502, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1187689984480915467, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1187669711266394222, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1187689984480915468, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1187669711266394222, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=39, endPage=43, ext={EN=ArticleExt(id=1187669714231767171, articleId=1187669714034634882, tenantId=1146029695717560320, journalId=1185652524569653253, language=EN, title=Study on Causes and Control of Surface Defects for 310 Zed Beam, columnId=1187095652984042303, journalTitle=Science & Technology of Baotou Steel, columnName=Variety Quality and Experimental Study, runingTitle=null, highlight=null, articleAbstract=
In this paper, the causes of surface defects for 310 zed beam rolled by YQ450NQR1 continuous casting billet produced with cross section of bloom (320×415 mm) by 7# continuous casting machine in Steel-making Plant of Baotou Steel are analyzed and control scheme is proposed so that the yield of product is improved. The tongue-shaped defects in rolled products are determined to be caused by the surface crack at corner of continuous casting billet by analyzing the macrostructure and microstructure of continuous casting billet and rolled products with metallographic microscope and scanning electron microscope. The qualified rate of YQ450NQR1 continuous casting billet is improved from 90.5% to 98.5% and stable control of product quality for 310 zed beam is realized through reducing the water amount and optimizing uniformity of water crevice for crystallizer to improve the uniformity of continuous casting billet cooled in crystallizer as well as taking such measures as reducing the specific water amount of secondary cooling, increasing casting speed to increase the surface temperature of entering tension leveler and optimizing slow cooling regime.
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文章主要针对包钢炼钢厂7#铸机大方坯(320×415 mm)断面生产YQ450NQR1轧制310乙字钢的表面缺陷原因进行了分析并提出了控制方案,提高了产品的成材率。通过利用金相显微镜以及电镜对铸坯及轧材的宏微观组织进行分析,明确轧材中的舌头状缺陷来源于连铸坯的角部表面裂纹。通过减少结晶器水量和优化结晶器水缝均匀性提升铸坯在结晶器内冷却的均匀性,同时采取降低二冷比水量和提高拉速等措施提高进入拉矫机的表面温度,并对缓冷制度进行优化,最终使得YQ450NQR1铸坯合格率从90.5%提升到98.5%,实现310乙字钢产品质量的稳定控制。
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卢雄慧(1984-),男,内蒙古呼和浩特市人,工程师,现从事炼钢连铸工艺研究工作。
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卢雄慧(1984-),男,内蒙古呼和浩特市人,工程师,现从事炼钢连铸工艺研究工作。
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卢雄慧(1984-),男,内蒙古呼和浩特市人,工程师,现从事炼钢连铸工艺研究工作。
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铸坯角部裂纹断口宏观组织, figureFileSmall=1CLLkjZsM9psdVsTMw+uoA==, figureFileBig=J8u8JVe3GNWY7AvebPdNkw==, tableContent=null), ArticleFig(id=1187827024031789629, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1187669714034634882, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 名称 | C | O | Na | Mg | Al | Si | S | Ca | Mn | Fe |
| 成分 | 56.8 | 12.3 | 1.06 | 0.55 | 0.35 | 0.59 | - | 2.94 | 1.05 | 24.48 |
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裂纹处附着物能谱元素组成(质量分数) %
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| 名称 | C | O | Na | Mg | Al | Si | S | Ca | Mn | Fe |
| 成分 | 56.8 | 12.3 | 1.06 | 0.55 | 0.35 | 0.59 | - | 2.94 | 1.05 | 24.48 |
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| 位置 | 右 | | 前 | | 左 | | 后 |
| 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 |
| 8#结晶器 | 4.80 | 4.90 | | 4.90 | 4.95 | | 4.80 | 4.80 | | 4.85 | 4.85 |
| 标准差 | 0.80 | 0.90 | | 0.90 | 0.95 | | 0.80 | 0.80 | | 0.85 | 0.85 |
| 10#结晶器 | 4.80 | 4.80 | | 4.80 | 4.85 | | 4.80 | 4.70 | | 4.80 | 4.70 |
| 标准差 | 0.80 | 0.80 | | 0.80 | 0.85 | | 0.80 | 0.70 | | 0.80 | 0.70 |
| 11#结晶器 | 4.80 | 4.80 | | 4.95 | 4.95 | | 4.85 | 4.90 | | 4.85 | 4.90 |
| 标准差 | 0.80 | 0.80 | | 0.95 | 0.95 | | 0.85 | 0.90 | | 0.85 | 0.90 |
), ArticleFig(id=1187827024258282048, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1187669714034634882, language=CN, label=表2, caption=
结晶器不同位置水缝测量结果 mm
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| 位置 | 右 | | 前 | | 左 | | 后 |
| 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 |
| 8#结晶器 | 4.80 | 4.90 | | 4.90 | 4.95 | | 4.80 | 4.80 | | 4.85 | 4.85 |
| 标准差 | 0.80 | 0.90 | | 0.90 | 0.95 | | 0.80 | 0.80 | | 0.85 | 0.85 |
| 10#结晶器 | 4.80 | 4.80 | | 4.80 | 4.85 | | 4.80 | 4.70 | | 4.80 | 4.70 |
| 标准差 | 0.80 | 0.80 | | 0.80 | 0.85 | | 0.80 | 0.70 | | 0.80 | 0.70 |
| 11#结晶器 | 4.80 | 4.80 | | 4.95 | 4.95 | | 4.85 | 4.90 | | 4.85 | 4.90 |
| 标准差 | 0.80 | 0.80 | | 0.95 | 0.95 | | 0.85 | 0.90 | | 0.85 | 0.90 |
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