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The continuous cooling transformation laws of X120M pipeline steel is studied with Gleeble 1 500 thermal simulated test machine as well as it is with controlled rolling and controlled cooling in laboratory. The results indicated that the microstructure of test steel was mainly lower bainite and martensite when cooling rate was at 20~50 ℃/s. When the finish cooling temperature of test steel is at 380 ℃, its yield strength is 900 MPa, tensile strength is 1 015 MPa, elongation is 18%, impact energy at -30 ℃ is 180 J and shearing area of drop weight tear test at -20 ℃ is 100%. The mechanical properties could meet the standard requirements.
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利用Gleeble 1500热模拟试验机,研究X120M管线钢奥氏体连续冷却转变规律,并在实验室对X120M管线钢进行控轧控冷处理。结果表明,当冷却速率在20~50 ℃/s之间时,试验钢组织主要为下贝氏体和马氏体。终冷温度为380 ℃时,试验钢屈服强度为900 MPa,抗拉强度为1 015 MPa,延伸率为18%,-30 ℃冲击功为180 J,-20 ℃落锤剪切面积为100%,力学性能符合标准要求。
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刘汉儒(1968-),男,内蒙古包头市人,工程师,现从事产品销售工作。
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1 包头钢铁(集团)有限责任公司新源科技有限公司,内蒙古 包头 014010, bio={"content":"
刘汉儒(1968-),男,内蒙古包头市人,工程师,现从事产品销售工作。
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刘汉儒(1968-),男,内蒙古包头市人,工程师,现从事产品销售工作。
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2 内蒙古包钢钢联股份有限公司长材厂,内蒙古 包头 014010, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1188503249423315245, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188049102852997344, xref=2, ext=[AuthorCompanyExt(id=1188503249444286766, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188049102852997344, companyId=1188503249423315245, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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| C | Si | Mn | P | S | Nb | Ti | Cr | Mo | Ni | Cu | B |
| ≤0.06 | ≤0.30 | ≤1.90 | ≤0.010 | ≤0.003 | ≤0.08 | ≤0.015 | ≤0.30 | ≤0.30 | ≤0.35 | ≤0.30 | 微量 |
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试验钢化学成分(质量分数) %
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| C | Si | Mn | P | S | Nb | Ti | Cr | Mo | Ni | Cu | B |
| ≤0.06 | ≤0.30 | ≤1.90 | ≤0.010 | ≤0.003 | ≤0.08 | ≤0.015 | ≤0.30 | ≤0.30 | ≤0.35 | ≤0.30 | 微量 |
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| 工艺 | 加热温度 /℃ | 再结晶区轧制 开轧温度/℃ | 非再结晶区轧制 开轧温度/℃ | 非再结晶区轧制 终轧温度/℃ | 终冷温度 /℃ | 冷却速率 /(℃·s-1) |
| 1# | 1 200 | 1 120 | 945 | 810 | 280 | 50 |
| 2# | 1 200 | 1 110 | 946 | 815 | 315 | 38 |
| 3# | 1 200 | 1 115 | 948 | 805 | 330 | 35 |
| 4# | 1 200 | 1 125 | 945 | 815 | 355 | 30 |
| 5# | 1 200 | 1 130 | 942 | 810 | 380 | 25 |
| 6# | 1 200 | 1 110 | 945 | 815 | 400 | 18 |
| 7# | 1 200 | 1 115 | 940 | 810 | 440 | 12 |
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试验钢轧制工艺
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| 工艺 | 加热温度 /℃ | 再结晶区轧制 开轧温度/℃ | 非再结晶区轧制 开轧温度/℃ | 非再结晶区轧制 终轧温度/℃ | 终冷温度 /℃ | 冷却速率 /(℃·s-1) |
| 1# | 1 200 | 1 120 | 945 | 810 | 280 | 50 |
| 2# | 1 200 | 1 110 | 946 | 815 | 315 | 38 |
| 3# | 1 200 | 1 115 | 948 | 805 | 330 | 35 |
| 4# | 1 200 | 1 125 | 945 | 815 | 355 | 30 |
| 5# | 1 200 | 1 130 | 942 | 810 | 380 | 25 |
| 6# | 1 200 | 1 110 | 945 | 815 | 400 | 18 |
| 7# | 1 200 | 1 115 | 940 | 810 | 440 | 12 |
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| 试样编号 | 终冷温度 /℃ | 屈服强度 /MPa | 抗拉强度 /MPa | 屈强比 | 伸长率 /% | 180°弯曲 (d=2a) |
| 标准要求 | | 830~1 050 | 915~1 145 | ≤0.99 | ≥14.0 | 无裂纹 |
| 1# | 280 | 1 030 | 1 140 | 0.90 | 15.0 | 有裂纹 |
| 2# | 315 | 995 | 1 095 | 0.91 | 16.0 | 合格 |
| 3# | 330 | 960 | 1 080 | 0.89 | 16.5 | 合格 |
| 4# | 355 | 930 | 1 020 | 0.91 | 17.0 | 合格 |
| 5# | 380 | 900 | 1 015 | 0.89 | 18.0 | 合格 |
| 6# | 400 | 850 | 955 | 0.89 | 19.5 | 合格 |
| 7# | 440 | 805 | 926 | 0.87 | 22.0 | 合格 |
), ArticleFig(id=1188503253370155351, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1188049102852997344, language=CN, label=表3, caption=
试验钢力学性能
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| 试样编号 | 终冷温度 /℃ | 屈服强度 /MPa | 抗拉强度 /MPa | 屈强比 | 伸长率 /% | 180°弯曲 (d=2a) |
| 标准要求 | | 830~1 050 | 915~1 145 | ≤0.99 | ≥14.0 | 无裂纹 |
| 1# | 280 | 1 030 | 1 140 | 0.90 | 15.0 | 有裂纹 |
| 2# | 315 | 995 | 1 095 | 0.91 | 16.0 | 合格 |
| 3# | 330 | 960 | 1 080 | 0.89 | 16.5 | 合格 |
| 4# | 355 | 930 | 1 020 | 0.91 | 17.0 | 合格 |
| 5# | 380 | 900 | 1 015 | 0.89 | 18.0 | 合格 |
| 6# | 400 | 850 | 955 | 0.89 | 19.5 | 合格 |
| 7# | 440 | 805 | 926 | 0.87 | 22.0 | 合格 |
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