| X80钢级大直径直缝埋弧焊管裂纹研究与工艺改进 |
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| 引用本文： | 王钢,边城,姚华,何俊鹏.X80钢级大直径直缝埋弧焊管裂纹研究与工艺改进[J].钢管,2012,41(6):9-13. |
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| 作者姓名： | 王钢 边城 姚华 何俊鹏 |
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| 作者单位： | 1. 中国石油集团渤海石油装备制造有限公司,河北青县,062658
2. 中国石油技术开发公司,北京,100101 |
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| 摘 要： | X80钢级大直径厚壁直缝埋弧焊管在扩径后存在焊缝趾部开裂现象。通过对该裂纹的断口及其理化性能进行检测,认为造成焊缝趾部开裂的原因是:焊接热输入量较高,热影响区韧性恶化;钢管扩径前焊缝附近母材存在应力集中;钢管热影响区与扩管模具发生挤压。针对上述因素,进行工艺改进,使得裂纹发生率从2.00%降低到0.12%。
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| 关 键 词： | X80钢级 直缝埋弧焊管 扩径 焊缝趾部裂纹 韧性恶化 应力集中 工艺改进 |
Research on Forming of Crack of Large-sized X80 SAWL Pipe and Improvement of Relevant Manufacturing Process |
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| Wang Gang
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Bian Cheng
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Yao Hua
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He Junpeng.Research on Forming of Crack of Large-sized X80 SAWL Pipe and Improvement of Relevant Manufacturing Process[J].Steel Pipe,2012,41(6):9-13. |
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| Authors: | Wang Gang Bian Cheng Yao Hua He Junpeng |
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| Affiliation: | 2 ( 1. CNPC Bohai Petroleum Equipment Manufacture Corp.,Qingxian 062658,China; 2. (CNPC)China Petroleum Technology & Development Corporation,Beijing 100101,China ) |
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| Abstract: | Cracking is found at the foot area of the welding seam of the large-sized X80 SAWL pipe as expanded. Relevant physical tests and chemical analysis are made to the fracture,and the results reveal the main elements which responsible for the cracking,including rather high welding heat input that makes the toughness of the metal of the HAZ greatly decreased,concentration of the stress in the base metal near the welding seam of the pipe that occurs before it is expanded,and extrusion that takes place between the HAZ of the tube and the expanding die. Based on the elements as identified,the welding process is improved,and thus the crack incidence rate is decreased from 2.00% to 0.12%. |
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| Keywords: | X80 steel grade SAWL pipe Diameter expanding Welding seam foot cracking Toughness worsening Stress concentration Process improvement |
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