Article(id=1198550867193463439, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1198550864987254948, articleNumber=1009-5438(2023)06-0007-06, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1696694400000, receivedDateStr=2023-10-08, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1763686394737, onlineDateStr=2025-11-21, pubDate=1703433600000, pubDateStr=2023-12-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1763686394737, onlineIssueDateStr=2025-11-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1763686394737, creator=13701087609, updateTime=1763686394737, updator=13701087609, issue=Issue{id=1198550864987254948, tenantId=1146029695717560320, journalId=1185652524569653253, year='2023', volume='49', issue='6', 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=1763686394210, creator=13701087609, updateTime=1764231183111, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1200835875295843255, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1198550864987254948, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1200835875300037560, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1198550864987254948, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=7, endPage=12, ext={EN=ArticleExt(id=1198550869772960477, articleId=1198550867193463439, tenantId=1146029695717560320, journalId=1185652524569653253, language=EN, title=Control of Longitudinal Crack on Surface of Q420NQR1 Beam Blank with Single Nozzle Pouring, columnId=1198550865733841063, journalTitle=Science & Technology of Baotou Steel, columnName=Special Issue for Manufacturing Dept. of Inner Mongolia Baotou Steel Union Co., Ltd., runingTitle=null, highlight=null, articleAbstract=
In this paper, the causes of defect of longitudinal crack on surface of Q420NQR1 continuous casting billet and rolled products with hypo-peritectic steel are analyzed as well as the control measures are put forward. The results indicated that the defect of longitudinal cracks for rolled products originated from longitudinal cracks on surface of casting blank, most of which were on the web of beam blank away from submerged entry nozzle. The inner flow field of crystallizer is studied by physical simulation. It is found that there is single circulation flow on the web of crystallizer, which directly causes the melt cinder layer of casting powder away from submerged entry nozzle to be thinner so that effective heat control is difficult to be realized at this position. The flow velocity of surface layer of liquid steel could be reduced and even distribution of melt cinder could be promoted through appropriately increasing the insertion depth of submerged entry nozzle; the quality of casting blank and rolled products could be improved combining with the uneven burden distribution mode of casting powder so that the longitudinal crack rates of casting blank and rolled products are reduced by 30% and 34% respectively.
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针对亚包晶钢Q420NQR1连铸坯及轧材的表面纵裂纹缺陷分析了纵裂纹成因并提出了控制措施。结果表明,轧材的纵裂纹缺陷源于铸坯表面纵裂纹,铸坯表面纵裂纹绝大部分位于异型坯远离水口位置的腹板。通过物理模拟对结晶器内部流场进行研究,发现结晶器内腹板位置存在单循环流,这直接导致远离水口位置的保护渣液渣层较薄,在该位置下难以实现有效控热。通过适当增加水口插入深度可以降低钢液表面流速并促进液渣均匀分布;同时结合保护渣非均匀布料方式可有效改善铸坯及轧材质量,铸坯及轧材纵裂纹率分别降低30%和34%。
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张 凯(1989-),男,内蒙古商都县人,工程师,现从事炼钢连铸工艺研究工作。
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1 内蒙古包钢钢联股份有限公司炼钢厂,内蒙古 包头 014010, bio={"content":"
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张 凯(1989-),男,内蒙古商都县人,工程师,现从事炼钢连铸工艺研究工作。
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试样不同位置裂纹处金相组织 (a)试样边缘处裂纹;(b)试样中心位置处裂纹
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| 范围 | C | Si | Mn | P | S | Cu | Ni | Cr | V |
| 上限 | 0.12 | 0.45 | 1.35 | 0.020 | 0.015 | 0.32 | 0.32 | 0.32 | 0.14 |
| 下限 | 0.08 | 0.35 | 1.25 | 0 | 0 | 0.28 | 0.26 | 0.28 | 0.10 |
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Q420NQR1大梁钢化学成分(质量分数)%
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| 范围 | C | Si | Mn | P | S | Cu | Ni | Cr | V |
| 上限 | 0.12 | 0.45 | 1.35 | 0.020 | 0.015 | 0.32 | 0.32 | 0.32 | 0.14 |
| 下限 | 0.08 | 0.35 | 1.25 | 0 | 0 | 0.28 | 0.26 | 0.28 | 0.10 |
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| 位置 | 试样边缘处 | 试样中心处 |
| 裂纹处 | 15.8 | 18.1 |
| 远离裂纹位置1 | 39.2 | 30.8 |
| 远离裂纹位置2 | 35.2 | 29.3 |
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| 位置 | 试样边缘处 | 试样中心处 |
| 裂纹处 | 15.8 | 18.1 |
| 远离裂纹位置1 | 39.2 | 30.8 |
| 远离裂纹位置2 | 35.2 | 29.3 |
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| 裂纹发生位置 | 是否为渣沟 |
| 是 | 否 |
| 远水口侧(南侧) | 10 | 13 |
| 近水口侧(北侧) | 1 | 6 |
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南北侧不同种类裂纹数量
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| 裂纹发生位置 | 是否为渣沟 |
| 是 | 否 |
| 远水口侧(南侧) | 10 | 13 |
| 近水口侧(北侧) | 1 | 6 |
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| 项目 | 原型参数 | 模型参数 |
结晶器尺寸 (长×宽×高)/mm | 750×383×93 | 450×230×56 |
| 液体流量/(m3·h-1) | 5.90 | 1.64 |
| 水口内径/mm | 30 | 18 |
| 水口插入深度/mm | 65 | 39 |
| 保护渣密度/(kg·m-3) | 2 500 | 880 |
| 保护渣动力黏度/(Pa·s) | 0.79 | 0.28 |
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试验参数
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| 项目 | 原型参数 | 模型参数 |
结晶器尺寸 (长×宽×高)/mm | 750×383×93 | 450×230×56 |
| 液体流量/(m3·h-1) | 5.90 | 1.64 |
| 水口内径/mm | 30 | 18 |
| 水口插入深度/mm | 65 | 39 |
| 保护渣密度/(kg·m-3) | 2 500 | 880 |
| 保护渣动力黏度/(Pa·s) | 0.79 | 0.28 |
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