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The causes on lower impact toughness of weld for 10 mm thick 700 MPa grade square and rectangular welded pipe welded with high frequency resistance are analyzed with such inspection and analytical equipment as metallographic microscope, impact testing machine, scanning electron microscope and energy dispersive spectrometer. The results showed that there were such endogenous inclusions as silicate and titanium nitride as well as foreign inclusion that is mainly manganese oxide at the weld, the combined effect of which causes impact absorbing energy at room temperature of weld to be less than 8 J. Subsequently, the weld quality of square and rectangular welded pipe is improved, impact absorbing energy of weld is increased to about 20 J by taking such measures as strengthening control level of steelmaking process and increasing upset force of high frequency resistance welding. In straightening and sizing process, cracking rate of square and rectangular welded pipe is decreased from 8% to 3%.
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采用金相显微镜、冲击试验机、扫描电子显微镜及能谱仪等检验、分析设备对10 mm厚700 MPa级高频电阻焊接方矩管焊缝冲击韧性偏低的原因进行分析。结果表明,焊缝处存在硅酸盐、氮化钛等内生夹杂物和以氧化锰为主的外来夹杂物,两者共同作用导致焊缝室温冲击吸收功小于8 J;后续采取加强炼钢工艺控制水平及增加高频电阻焊接顶锻力等措施,提高方矩管焊缝质量,焊缝冲击吸收功提高到20 J左右。在矫直定径工序,方矩管的开裂率从8%降低至3%。
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贾瑞雪(1987-),女,内蒙古包头市人,工程师,现从事板材应用技术研究工作。
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贾瑞雪(1987-),女,内蒙古包头市人,工程师,现从事板材应用技术研究工作。
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journalId=1185652524569653253, articleId=1201193877819581394, doi=null, pmid=null, pmcid=null, year=2009, volume=38, issue=5, pageStart=59, pageEnd=63, url=null, language=null, rfNumber=[1], rfOrder=0, authorNames=李烨, 万国胜, 李立新, journalName=钢管, refType=null, unstructuredReference=李烨, 万国胜, 李立新. 冷弯方、矩形钢管质量的优化[J].
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2009,
38(5):59-63., articleTitle=冷弯方、矩形钢管质量的优化, refAbstract=null), Reference(id=1201193884425609544, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, doi=null, pmid=null, pmcid=null, year=2024, volume=50, issue=15, pageStart=41, pageEnd=46, url=null, language=null, rfNumber=[2], rfOrder=1, authorNames=杨维宇, 康利明, 勤牧, journalName=包钢科技, refType=null, unstructuredReference=杨维宇, 康利明, 勤牧, 等. 高强韧性轮辋用490CL车轮钢焊接开裂失效分析[J].
包钢科技,
2024,
50(15):41-46., articleTitle=高强韧性轮辋用490CL车轮钢焊接开裂失效分析, refAbstract=null), Reference(id=1201193884505301328, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, doi=null, pmid=null, pmcid=null, year=2022, volume=51, issue=15, pageStart=155, pageEnd=158, url=null, language=null, rfNumber=[3], rfOrder=2, authorNames=杨维宇, 王建钢, 张智刚, journalName=热加工工艺, refType=null, unstructuredReference=杨维宇, 王建钢, 张智刚, 等. 14 mm厚的700L汽车大梁钢热轧卷强度不合格的原因分析[J].
热加工工艺,
2022,
51(15):155-158., articleTitle=14 mm厚的700L汽车大梁钢热轧卷强度不合格的原因分析, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1201193879769931785, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, xref=null, ext=[AuthorCompanyExt(id=1201193879778320394, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, companyId=1201193879769931785, 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=1201193879786709003, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, companyId=1201193879769931785, 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=1201193883049877745, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=EN, label=null, caption=null, figureFileSmall=hN/v9/+jbM9oePOg0HKYXA==, figureFileBig=srEJ10noNI0jY3s4BWQUgg==, tableContent=null), ArticleFig(id=1201193883133763829, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=CN, label=图1, caption=
700 MPa级高频电阻焊接方矩管, figureFileSmall=hN/v9/+jbM9oePOg0HKYXA==, figureFileBig=srEJ10noNI0jY3s4BWQUgg==, tableContent=null), ArticleFig(id=1201193883377033476, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=EN, label=null, caption=null, figureFileSmall=7tU37Rc2ueAsOeYLOeTv8g==, figureFileBig=ERzrQ6eSWGHoDK8e33FcOg==, tableContent=null), ArticleFig(id=1201193883515445514, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=CN, label=图2, caption=
试验钢母材、热影响区、焊缝显微组织, figureFileSmall=7tU37Rc2ueAsOeYLOeTv8g==, figureFileBig=ERzrQ6eSWGHoDK8e33FcOg==, tableContent=null), ArticleFig(id=1201193883620303124, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=EN, label=null, caption=null, figureFileSmall=XCV+vnPPA2cEgdNYSZ6u7g==, figureFileBig=hIqXTESSyuRWEUWRdrBxlg==, tableContent=null), ArticleFig(id=1201193883695800604, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=CN, label=图3, caption=
焊缝夹杂物形貌及能谱分析, figureFileSmall=XCV+vnPPA2cEgdNYSZ6u7g==, figureFileBig=hIqXTESSyuRWEUWRdrBxlg==, tableContent=null), ArticleFig(id=1201193883796463907, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=EN, label=null, caption=null, figureFileSmall=I52BOniUeSk1V9E+gTzJWA==, figureFileBig=rZdM/HCXWGXxKxAvDFKZuQ==, tableContent=null), ArticleFig(id=1201193883876155687, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=CN, label=图4, caption=
焊缝冲击断口形貌及夹杂物能谱分析, figureFileSmall=I52BOniUeSk1V9E+gTzJWA==, figureFileBig=rZdM/HCXWGXxKxAvDFKZuQ==, tableContent=null), ArticleFig(id=1201193883976818990, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | C | Si | Mn | P | S | Alt | Nb | Ti | N |
| 实测值 | 0.07 | 0.08 | 1.63 | 0.014 | 0.002 | 0.032 | 0.048 | 0.079 | 0.004 0 |
| 技术协议 | 0.06~0.08 | 0.03~0.15 | 1.60~1.80 | ≤0.015 | ≤0.005 | 0.020~0.040 | 0.040~0.060 | 0.070~0.090 | ≤0.005 0 |
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试验钢的化学成分(质量分数)%
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | C | Si | Mn | P | S | Alt | Nb | Ti | N |
| 实测值 | 0.07 | 0.08 | 1.63 | 0.014 | 0.002 | 0.032 | 0.048 | 0.079 | 0.004 0 |
| 技术协议 | 0.06~0.08 | 0.03~0.15 | 1.60~1.80 | ≤0.015 | ≤0.005 | 0.020~0.040 | 0.040~0.060 | 0.070~0.090 | ≤0.005 0 |
), ArticleFig(id=1201193884123619643, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | ReL/MPa | Rm/MPa | A/% | KV2(室温)/J |
| 检测值 | 684 | 758 | 23.0 | 7.8 |
| 技术协议 | ≥620 | ≥700 | ≥17.0 | 无要求 |
), ArticleFig(id=1201193884224282942, tenantId=1146029695717560320, journalId=1185652524569653253, articleId=1201193877819581394, language=CN, label=表2, caption=
700 MPa级焊接方矩管母材拉伸性能和焊缝冲击性能
, figureFileSmall=null, figureFileBig=null, tableContent=
| 项目 | ReL/MPa | Rm/MPa | A/% | KV2(室温)/J |
| 检测值 | 684 | 758 | 23.0 | 7.8 |
| 技术协议 | ≥620 | ≥700 | ≥17.0 | 无要求 |
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