Article(id=1187341683088835442, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1187341678487679284, articleNumber=1009-5438(2022)02-0042-04, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1644422400000, receivedDateStr=2022-02-10, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1761013916990, onlineDateStr=2025-10-21, pubDate=1650816000000, pubDateStr=2022-04-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1761013916990, onlineIssueDateStr=2025-10-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1761013916990, creator=13701087609, updateTime=1761013916990, updator=13701087609, issue=Issue{id=1187341678487679284, tenantId=1146029695717560320, journalId=1185652524569653253, year='2022', volume='48', 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=1761013915892, creator=13701087609, updateTime=1761015806887, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1187349609945907689, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1187341678487679284, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1187349609945907690, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1187341678487679284, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=42, endPage=45, ext={EN=ArticleExt(id=1187341683273384819, articleId=1187341683088835442, tenantId=1146029695717560320, journalId=1185652524569653253, language=EN, title=Study on Microstructure and Properties of Ti Microalloyed 700 MPa Grade Beam Steel, columnId=1187340471245357385, journalTitle=Science & Technology of Baotou Steel, columnName=Quality of Variety and Experiment and Research, runingTitle=null, highlight=null, articleAbstract=
In this paper, the microstructure and properties of 700 MPa grade beam steel with such two composition designs as low C+Mn+Ti and low C+Mn+Ti+Nb are compared and analyzed. The results showed that the plasticity of single Ti microalloyed product and that of Nb-Ti multi-microalloyed product were the same with the same strength, but the low temperature impact toughness of single Ti microalloyed product was poorer so that its brittle transition was at -20 ℃, while the brittle transition of Nb-Ti multi-microalloyed product was at -50 ℃. It could be improved through increasing the rolling reduction of the first pass of rough rolling and thickness of intermediate billet so as to reach the control level of Nb-Ti multi-microalloyed products.
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文章对比分析了低C+Mn+Ti和低C+Mn+Ti+Nb两种成分设计的700 MPa级大梁钢组织和性能,结果表明,在相同强度情况下,单Ti微合金化产品和Nb-Ti复合微合金化产品塑性相同,但低温冲击韧性较差,前者在-20 ℃发生脆性转变,而后者在-50 ℃才发生脆性转变。通过提高粗轧首道次压下量和中间坯厚度有助于改善单Ti微合金化大梁钢低温冲击韧性,使其达到Nb-Ti复合微合金化产品控制水平。
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张智刚(1992-),男,内蒙古包头市人,硕士,工程师,现从事新产品开发及稀土钢研发工作。
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39(3):16-18., articleTitle=MPa级钛微合金化钢带生产实践, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1187341775862645707, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1187341683088835442, xref=1, ext=[AuthorCompanyExt(id=1187341775871034316, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1187341683088835442, companyId=1187341775862645707, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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| 试验钢 | C | Si | Mn | P | S | Alt | Nb | Ti | N |
| A和B | 0.07 | 0.07 | 1.38 | ≤0.015 | ≤0.005 0 | 0.033 | | 0.10 | ≤0.006 0 |
| C | 0.07 | 0.07 | 1.38 | ≤0.015 | ≤0.005 0 | 0.040 | 0.03 | 0.09 | ≤0.006 0 |
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试验钢化学成分(质量分数)%
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| 试验钢 | C | Si | Mn | P | S | Alt | Nb | Ti | N |
| A和B | 0.07 | 0.07 | 1.38 | ≤0.015 | ≤0.005 0 | 0.033 | | 0.10 | ≤0.006 0 |
| C | 0.07 | 0.07 | 1.38 | ≤0.015 | ≤0.005 0 | 0.040 | 0.03 | 0.09 | ≤0.006 0 |
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| 试验钢 | 出炉温度/℃ | 粗轧首道次压下量/mm | 中间坯厚度/mm | 终轧温度/℃ | 卷取温度/℃ | 冷却速度/℃ |
| A | 1 250~1 270 | 30 | 39 | 835~855 | 600~610 | 20~30 |
| B | 1 250~1 270 | 32 | 43 | 835~855 | 600~610 | 20~30 |
| C | 1 250~1 270 | 30 | 39 | 835~855 | 600~610 | 20~30 |
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试验钢控轧控冷工艺参数
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| 试验钢 | 出炉温度/℃ | 粗轧首道次压下量/mm | 中间坯厚度/mm | 终轧温度/℃ | 卷取温度/℃ | 冷却速度/℃ |
| A | 1 250~1 270 | 30 | 39 | 835~855 | 600~610 | 20~30 |
| B | 1 250~1 270 | 32 | 43 | 835~855 | 600~610 | 20~30 |
| C | 1 250~1 270 | 30 | 39 | 835~855 | 600~610 | 20~30 |
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| 试验钢 | 力学性能 | 180°冷弯 D=2a |
屈服强度 /MPa | 抗拉强度 /MPa | 延伸率 /% |
| A | 723 | 779 | 22.3 | |
| B | 710 | 772 | 23.9 | 合格 |
| C | 716 | 780 | 21.3 | |
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不同生产工艺下700 MPa级大梁钢拉伸和弯曲性能
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| 试验钢 | 力学性能 | 180°冷弯 D=2a |
屈服强度 /MPa | 抗拉强度 /MPa | 延伸率 /% |
| A | 723 | 779 | 22.3 | |
| B | 710 | 772 | 23.9 | 合格 |
| C | 716 | 780 | 21.3 | |
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