Article(id=1188049104581050617, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1188049099627574244, articleNumber=1009-5438(2024)02-0058-05, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1708444800000, receivedDateStr=2024-02-21, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1761182579417, onlineDateStr=2025-10-23, pubDate=1713974400000, pubDateStr=2024-04-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1761182579417, onlineIssueDateStr=2025-10-23, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1761182579417, creator=13701087609, updateTime=1761182579417, updator=13701087609, issue=Issue{id=1188049099627574244, tenantId=1146029695717560320, journalId=1185652524569653253, year='2024', volume='50', 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=1761182578236, creator=13701087609, updateTime=1761291001661, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1188503860504052243, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1188049099627574244, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1188503860504052244, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1188049099627574244, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=58, endPage=62, ext={EN=ArticleExt(id=1188049104799154432, articleId=1188049104581050617, tenantId=1146029695717560320, journalId=1185652524569653253, language=EN, title=Study on Microstructure and Properties of High-strength Anti-seismic Fire-resistant H Beam for Building Structure, columnId=1187095652984042303, journalTitle=Science & Technology of Baotou Steel, columnName=Variety Quality and Experimental Study, runingTitle=null, highlight=null, articleAbstract=

The effects of microstructure of high-strength anti-seismic fire-resistant H beam for building structure on its strength, toughness and high temperature strength are studied with such analysis means as TEM (transmission electron microscope), metallographic microscope and EBSD (electron back-scattered diffraction). The results showed that the controlled rolling and controlled cooling were not needed under the premise of reasonable chemical composition design, two-phase structure of air cooling bainite and ferrite for test steel after hot rolling was obtained. It is found by observing the microstructure after holding at 600 ℃ for 3 hours that there is nano-level interphase precipitates in ferrite and their line spacing is about 24~34 nm. For the hot rolled high-strength anti-seismic fire-resistant H beam for building structure, its yield strength≥500 MPa, elongation≥22%, yield ratio≤0.85, impact energy at -20 ℃≥34 J and yield strength after holding at 600 ℃ for 3 hours≥310 MPa.

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采用TEM、金相显微镜、EBSD等分析手段,研究建筑结构用高强抗震耐火H型钢的微观组织对其强度、韧性及高温强度的影响。结果表明,在合理的化学成分设计前提下,不需要控轧控冷手段,热轧后试验钢获得空冷贝氏体和铁素体两相组织。观察600 ℃保温3小时后的组织发现,在铁素体内部有纳米级相间析出物存在,析出物的行间距约在24~34 nm之间。热轧建筑结构用高强抗震耐火H型钢的屈服强度≥500 MPa,延伸率≥22%,屈强比≤0.85,-20 ℃冲击功≥34 J,600 ℃保温3小时后屈服强度≥310 MPa。

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宋振东(1982-),男,内蒙古赤峰市人,硕士,高级工程师,现从事特钢、型钢新产品开发工作。

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宋振东(1982-),男,内蒙古赤峰市人,硕士,高级工程师,现从事特钢、型钢新产品开发工作。

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钢种	C	Si	Mn	P	S	Cr	Ni	Cu	V	Nb	Mo
BG460SWF	≤0.11	≤0.30	≤1.30	≤0.010	≤0.010	≤0.40	≤0.30	≤0.40	≤0.10	≤0.06	≤0.4

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建筑结构用高强抗震耐火H型钢的化学成分(质量分数) %

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钢种	C	Si	Mn	P	S	Cr	Ni	Cu	V	Nb	Mo
BG460SWF	≤0.11	≤0.30	≤1.30	≤0.010	≤0.010	≤0.40	≤0.30	≤0.40	≤0.10	≤0.06	≤0.4

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编号	预热段温度/℃	加热段温度/℃	均热段温度/℃	加热时间/h	开轧温度/℃
1	700	1 201	1 243	8.12	1 151
2	700	1 201	1 243	8.28	1 144

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加热轧制工艺

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编号	预热段温度/℃	加热段温度/℃	均热段温度/℃	加热时间/h	开轧温度/℃
1	700	1 201	1 243	8.12	1 151
2	700	1 201	1 243	8.28	1 144

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编号	1道次温度/℃	3道次温度/℃	终轧温度/℃	压缩比/%	轧制力/kN
1	965	962	820	90	3 000
2	1 007	989	880	90	3 000

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CCS轧制参数

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编号	1道次温度/℃	3道次温度/℃	终轧温度/℃	压缩比/%	轧制力/kN
1	965	962	820	90	3 000
2	1 007	989	880	90	3 000

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编号	屈服强度/MPa	抗拉强度/MPa	延伸率/%	屈强比	600 ℃高温屈服强度/MPa
1	547	788	22.5	0.69	321
2	581	850	22.5	0.68	324

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力学性能

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编号	屈服强度/MPa	抗拉强度/MPa	延伸率/%	屈强比	600 ℃高温屈服强度/MPa
1	547	788	22.5	0.69	321
2	581	850	22.5	0.68	324

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编号	试样尺寸(宽×高×长) /mm	冲击功(-20 ℃) /J
1	7.5×10×55	70	54	71
2	7.5×10×55	75	73	61

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冲击性能

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编号	试样尺寸(宽×高×长) /mm	冲击功(-20 ℃) /J
1	7.5×10×55	70	54	71
2	7.5×10×55	75	73	61

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