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Article(id=1201193878981403626, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1201193876590654455, articleNumber=1009-5438(2025)04-0037-03, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1740758400000, receivedDateStr=2025-03-01, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1764316537852, onlineDateStr=2025-11-28, pubDate=1756051200000, pubDateStr=2025-08-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1764316537852, onlineIssueDateStr=2025-11-28, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1764316537852, creator=13701087609, updateTime=1764316537852, updator=13701087609, issue=Issue{id=1201193876590654455, tenantId=1146029695717560320, journalId=1185652524569653253, year='2025', volume='51', issue='4', pageStart='1', pageEnd='98', issueExtLink='null', onlineDate='null', pubDate='1756051200000', pubDateStr='2025-08-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1764316537282, creator='13701087609', updateTime=1764316948844, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1201195602878100389, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1201193876590654455, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1201195602878100390, tenantId=1146029695717560320, journalId=1185652524569653253, issueId=1201193876590654455, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=37, endPage=39, ext={EN=ArticleExt(id=1201193879291782130, articleId=1201193878981403626, tenantId=1146029695717560320, journalId=1185652524569653253, language=EN, title=Research and Development of Hot Rolled Steel Strip for CT70 Grade Corrosion Resistant Coiled Tubing, columnId=1187095652984042303, journalTitle=Science & Technology of Baotou Steel, columnName=Variety Quality and Experimental Study, runingTitle=null, highlight=null, articleAbstract=

The composition and production process of hot rolled steel strip for CT70 grade corrosion resistant coiled tubing are independently designed and formulated as well as small batch industrial trial production is carried out. For the trial product, the yield strength is 520~522 MPa, tensile strength is 575~584 MPa, elongation is 33%~34%, microstructure is mainly ferrite +pearlite with a small quantity of bainite, banded structure is grade 1.0 and total of inclusions is grade 1.0 so that non-metallic inclusions are well controlled. The mechanical properties, resistance to hydrogen induced cracking (HIC) and welding performance indexes of steel strip for CT70 as well as the mechanical properties and hardness of coiled tubing manufactured with steel strip for CT70 could all meet the user requirements.

, authors=null, authorsList=Lei Dong, Li Xie, Lulu Huang, Xiaoming Yuan, Cheng Su, Li Huang, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1201193879832846351, articleId=1201193878981403626, tenantId=1146029695717560320, journalId=1185652524569653253, language=CN, title=CT70钢级耐腐蚀连续油管用热轧钢带研发, columnId=1185887584472417142, journalTitle=包钢科技, columnName=品种质量与试验研究, runingTitle=null, highlight=null, articleAbstract=

自主设计和制定CT70钢级耐腐蚀连续油管用热轧钢带的成分和生产工艺,组织小批量工业试制。试制的CT70钢级耐腐蚀连续油管用热轧钢带屈服强度为520~522 MPa,抗拉强度为575~584 MPa,延伸率为33%~34%,显微组织以铁素体+珠光体为主,伴有少量的贝氏体,带状组织为1.0级,夹杂物总和为1.0级,非金属夹杂物控制良好。CT70用钢带的力学性能、抗氢致开裂(HIC)性能及焊接性能指标均满足用户要求。CT70用钢带制成的连续油管力学性能、硬度满足客户要求。

, authors=

董 磊(1986-),男,内蒙古包头市人,硕士,高级工程师,现从事耐候钢、管线钢等板材产品研发工作。

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董 磊(1986-),男,内蒙古包头市人,硕士,高级工程师,现从事耐候钢、管线钢等板材产品研发工作。

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董 磊(1986-),男,内蒙古包头市人,硕士,高级工程师,现从事耐候钢、管线钢等板材产品研发工作。

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C Si Mn P S Nb Cu Cr Ni Mo
0.06~0.10 0.10~0.30 0.60~0.90 ≤0.018 ≤0.005 0.010~0.025 0.20~0.30 0.45~0.65 0.10~0.25 0.10~0.30
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化学成分设计(质量分数)%

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C Si Mn P S Nb Cu Cr Ni Mo
0.06~0.10 0.10~0.30 0.60~0.90 ≤0.018 ≤0.005 0.010~0.025 0.20~0.30 0.45~0.65 0.10~0.25 0.10~0.30
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厚度/mm 钢坯出炉温度/℃ 均热时间/min 精轧终轧温度/℃ 卷取温度/℃ 冷却模式
4.0 1 250±20 30~60 890±15 620±15 隔一开一
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轧制工艺参数

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厚度/mm 钢坯出炉温度/℃ 均热时间/min 精轧终轧温度/℃ 卷取温度/℃ 冷却模式
4.0 1 250±20 30~60 890±15 620±15 隔一开一
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非金属夹杂物 晶粒度 带状组织
A B C D
实测 0 0 0 1.0 12.5 1.0
要求 ≤1.5 ≤1.5 ≤1.5 ≤1.5 ≥10 ≤2.0
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非金属夹杂物及晶粒度检验结果级

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非金属夹杂物 晶粒度 带状组织
A B C D
实测 0 0 0 1.0 12.5 1.0
要求 ≤1.5 ≤1.5 ≤1.5 ≤1.5 ≥10 ≤2.0
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屈服强度/MPa 抗拉强度/MPa 180°弯曲试验(D=2a) 延伸率/% 屈强比 硬度(HV10)
1# 520 575 合格 33 0.90 175
2# 522 584 合格 34 0.89 179
平均 521 579.5 33.5 0.895 177
要求 420~550 ≥530 ≥23 ≤0.90 ≤220
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CT70用热轧钢带力学性能

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屈服强度/MPa 抗拉强度/MPa 180°弯曲试验(D=2a) 延伸率/% 屈强比 硬度(HV10)
1# 520 575 合格 33 0.90 175
2# 522 584 合格 34 0.89 179
平均 521 579.5 33.5 0.895 177
要求 420~550 ≥530 ≥23 ≤0.90 ≤220
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ReL/MPa Rm/MPa A50/%
1# 505 552 31.5
2# 516 560 37.5
3# 529 574 36.0
4# 488 584 33.0
平均 510 568 34.5
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连续油管整管拉伸性能

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ReL/MPa Rm/MPa A50/%
1# 505 552 31.5
2# 516 560 37.5
3# 529 574 36.0
4# 488 584 33.0
平均 510 568 34.5
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CT70钢级耐腐蚀连续油管用热轧钢带研发
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董磊 , 谢丽 , 黄禄璐 , 袁晓鸣 , 宿成 , 黄利
包钢科技 | 品种质量与试验研究 2025,51(4): 37-39
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包钢科技 |品种质量与试验研究 2025 , 51 (4) : 37 -39
CT70钢级耐腐蚀连续油管用热轧钢带研发
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董 磊(1986-),男,内蒙古包头市人,硕士,高级工程师,现从事耐候钢、管线钢等板材产品研发工作。

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董 磊(1986-),男,内蒙古包头市人,硕士,高级工程师,现从事耐候钢、管线钢等板材产品研发工作。

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city=null, postcode=null, companyName=null, departmentName=null, remark=内蒙古包钢钢联股份有限公司技术中心, 内蒙古 包头 014010)])])]
董磊, 谢丽, 黄禄璐, 袁晓鸣, 宿成, 黄利
作者信息
  • 内蒙古包钢钢联股份有限公司技术中心, 内蒙古 包头 014010
Research and Development of Hot Rolled Steel Strip for CT70 Grade Corrosion Resistant Coiled Tubing
Lei Dong, Li Xie, Lulu Huang, Xiaoming Yuan, Cheng Su, Li Huang
Affiliations
  • Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China
出版时间: 2025-08-25
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摘要
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自主设计和制定CT70钢级耐腐蚀连续油管用热轧钢带的成分和生产工艺,组织小批量工业试制。试制的CT70钢级耐腐蚀连续油管用热轧钢带屈服强度为520~522 MPa,抗拉强度为575~584 MPa,延伸率为33%~34%,显微组织以铁素体+珠光体为主,伴有少量的贝氏体,带状组织为1.0级,夹杂物总和为1.0级,非金属夹杂物控制良好。CT70用钢带的力学性能、抗氢致开裂(HIC)性能及焊接性能指标均满足用户要求。CT70用钢带制成的连续油管力学性能、硬度满足客户要求。

CT70连续油管用钢带  /  力学性能  /  HIC性能  /  焊接性能

The composition and production process of hot rolled steel strip for CT70 grade corrosion resistant coiled tubing are independently designed and formulated as well as small batch industrial trial production is carried out. For the trial product, the yield strength is 520~522 MPa, tensile strength is 575~584 MPa, elongation is 33%~34%, microstructure is mainly ferrite +pearlite with a small quantity of bainite, banded structure is grade 1.0 and total of inclusions is grade 1.0 so that non-metallic inclusions are well controlled. The mechanical properties, resistance to hydrogen induced cracking (HIC) and welding performance indexes of steel strip for CT70 as well as the mechanical properties and hardness of coiled tubing manufactured with steel strip for CT70 could all meet the user requirements.

steel strip for CT70 coiled tubing  /  mechanical properties  /  HIC performance  /  welding performance
董磊, 谢丽, 黄禄璐, 袁晓鸣, 宿成, 黄利. CT70钢级耐腐蚀连续油管用热轧钢带研发. 包钢科技, 2025 , 51 (4) : 37 -39 .
Lei Dong, Li Xie, Lulu Huang, Xiaoming Yuan, Cheng Su, Li Huang. Research and Development of Hot Rolled Steel Strip for CT70 Grade Corrosion Resistant Coiled Tubing[J]. Science & Technology of Baotou Steel, 2025 , 51 (4) : 37 -39 .
正文
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连续油管(Coiled Tubing,简称CT)是指可缠绕在直径1 m以上的卷筒上,由若干段长度在百米以上的柔性管通过对焊或斜焊工艺焊接而成的无接头连续管。与传统分段连接的油管相比,它无需频繁连接,可连续作业。近几年,随着设备材料制造技术的不断提高,连续油管凭借着作业成本低、作业效率高和安全性高等优势受到越来越多的关注,市场需求量逐渐增大。CT70钢级连续油管用热轧钢带的首次开发,完善了包钢管线钢品种结构,提高了包钢管线用钢的品牌影响力。
1 试制过程
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小批量工业试制前,完成了CT70钢级耐腐蚀连续油管用热轧钢带的成分设计和炼钢、轧钢工艺的制定,试制钢带厚度为4.0 mm。根据试制方案,对试制CT70用热轧钢带的显微组织、力学性能、HIC性能和焊接性能等进行了全面检验,试制产品各项性能满足用户要求。
1.1 成分设计
耐腐蚀连续油管用钢中最常用的元素有C、Si、Mn、Cu、Cr、Ni、Mo、Nb等[1-3],它们在耐腐蚀连续油管用钢中起到不同的作用。C含量的设计需保证成品钢有较好的焊接性能和抗腐蚀性能(C含量高会降低钢的耐大气腐蚀能力),C含量应控制在0.06%~0.10%,同时添加一定量的Cr、Cu、Ni、Mo,以提高钢的强度、抗氧化性和耐腐蚀性。微合金元素在控轧钢中最重要的作用是控制奥氏体的再结晶温度[4-5]。作为连续油管用钢中的主要微合金元素,Nb较Ti、V能显著提高钢的再结晶温度,所以成分设计中的Nb含量控制范围为0.010%~0.025%。CT70钢级连续油管用热轧钢带的具体化学成分设计如表1所示。
1.2 生产工艺
CT70钢级连续油管用钢带生产工艺流程为高炉炼铁→KR脱硫→转炉炼钢→LF精炼→板坯连铸→粗轧机轧制→高压水除鳞→F1~F7精轧机轧制→加密型层流冷却→卷取→取样→检验。
目前,常用CT70用热轧钢带的厚度规格一般在2.7~5.5 mm之间,试制钢带厚度设定为4.0 mm。针对薄规格产品在2 250 mm热轧产线轧制变形抗力大的生产难题,同时为了降低热轧钢带的内应力和改善钢板板型,热轧采用高温终轧工艺,适当提高卷取温度[6],采取隔一开一的冷却模式。CT70用热轧钢带轧制工艺参数见表2。
2 试制结果
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2.1 金相检验
采用蔡司显微镜(型号:Axiovert A1)在200倍放大条件下观察CT70用热轧钢带的显微组织,如图1所示。
由图1可见,CT70用热轧钢带显微组织以铁素体+珠光体为主,伴有少量的贝氏体。钢中非金属夹杂物及晶粒度的检验结果如表3所示,夹杂物总和为1.0级,带状组织为1.0级,表明钢带内部质量控制良好。
2.2 性能检测
2.2.1 力学性能
在钢带宽度方向上,分别在边部和1/4处取样进行拉伸性能、弯曲性能以及硬度检测,结果见表4。由表4可知,CT70用热轧钢带屈服强度平均为521 MPa,抗拉强度平均为579.5 MPa,延伸率平均为33.5%,屈强比≤0.90,HV10硬度为177,产品力学性能指标均满足客户要求。试制钢带具有高延伸率和低硬度的特点,钢带横向性能控制均匀。
2.2.2 抗氢致开裂(HIC)性能
在钢带宽度方向上,分别在1/2、1/4处各取一组三个纵向试样,按NACE TM 0284—2016《管道和压力容器用钢抗氢致开裂性能评价标准》进行HIC试验,试验溶液为A溶液(5.0%NaCl+0.5%CH3COOH+饱和H2S),试验时间为96 h。钢带HIC性能试验结果为裂纹厚度率CSR≤0%、裂纹敏感率CLR≤0%、裂纹长率CTR≤0%,表明试制钢带的HIC性能符合NACE TM 0284—2016标准要求。
2.2.3 焊接性能
根据GB/T 13298—2015《金属显微组织检测方法》对CT70用热轧钢带制成的连续油管横截面进行晶粒度评级,晶粒度为12级,满足客户对CT70钢级连续油管的技术要求。油管整管(Φ50.8 mm×4.0 mm)预先截取500 mm样品,采用德国ZIWCK1200拉伸试验机进行拉伸试验,试验结果见表5。连续油管屈服强度、抗拉强度和延伸率均满足客户要求。
依据GB/T 32660.1—2016《金属材料韦氏硬度试验》,采用Leica DMI 5000M光学显微镜对CT70钢级连续油管热影响区和母材进行显微硬度测试,热影响区HV10硬度在180~215之间,母材的HV10硬度在180~208之间,说明CT70钢级连续油管焊缝质量良好,满足客户对CT70钢级连续油管的技术要求。
3 结论
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(1)CT70钢级连续油管用热轧钢带屈服强度为520~522 MPa,抗拉强度为570~584 MPa,延伸率为33%~34%,力学性能和抗氢致开裂(HIC)性能均满足标准要求。
(2)CT70钢级连续油管用热轧钢带显微组织主要是铁素体和珠光体,伴有少量的贝氏体,非金属夹杂物总和为1.0级,带状组织为1.0级。
(3)CT70用热轧钢带制成的连续油管的晶粒度为12级,屈服强度平均值为510 MPa,抗拉强度平均值为568 MPa,延伸率平均值为34.5%,且焊缝质量良好,HV10硬度在180~208之间,连续油管的焊接性能满足标准要求。

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2025年第51卷第4期
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  • 接收时间：2025-03-01
  • 首发时间：2025-11-28
  • 出版时间：2025-08-25
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2种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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