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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.
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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。
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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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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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37(6):11-16., articleTitle=加热温度对X80钢级热煨弯管组织性能的影响, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1201193880084504610, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193878981403626, xref=null, ext=[AuthorCompanyExt(id=1201193880092893219, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193878981403626, companyId=1201193880084504610, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Technical Center of Inner Mongolia Baotou Steel Union Co., Ltd., Baotou 014010, Inner Mongolia Autonomous Region, China), AuthorCompanyExt(id=1201193880105476132, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193878981403626, companyId=1201193880084504610, language=CN, country=null, province=null, 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)])], figs=[ArticleFig(id=1201193883255398651, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193878981403626, language=EN, label=null, caption=null, figureFileSmall=yY+1f6hNNOC0EYB9cOiBfA==, figureFileBig=C/Kx0LevfCkMCerkWIXdfQ==, tableContent=null), ArticleFig(id=1201193883356061955, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193878981403626, language=CN, label=图1, caption=
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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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| 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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| 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 |
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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 | 晶粒度 | 带状组织 |
| A | B | C | D |
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| 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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| 2# | 516 | 560 | 37.5 |
| 3# | 529 | 574 | 36.0 |
| 4# | 488 | 584 | 33.0 |
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