Substantial differences amongst metallurgical and mechanical properties of base metal (BM), weld metal (WM) and heat-affected zone (HAZ) occur in general in welded steel structures It is common practice in various engineering structures to evaluate the fracture performance of welded structures by mechanical testing. Especially, the HAZ of steel welded joints shows a gradient of microstructure and mechanical properties from the fusion line to the unaffected base metal. This study is concerned with the effects of metallurgical and mechanical factors on the fracture performance of API 5L X65 pipeline steel weldments, as they are generally used for main natural gas transmission pipelines in Korea. First of all, we investigated the microscopic and macroscopic fracture behavior of the various micro-zones within the HAZ from the viewpoint of metallurgical factors. The effects of mechanical factors such as welding residual stress in steel weldment and strength mismatch between BM and WM, particularly in high strength steel weldments, are also analyzed. Therefore, the fracture performance of API 5L X65 pipeline steel weldment was mainly dependent on the change of macrostructure and its distribution in the welded joints.
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2002 4th International Pipeline Conference
September 29–October 3, 2002
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
0-7918-3620-7
PROCEEDINGS PAPER
Metallurgical and Mechanical Features of API 5L X65 Pipeline Steel Weldment
Jang-Bog Ju,
Jang-Bog Ju
Seoul National University, Seoul, Korea
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Jung-Suk Lee,
Jung-Suk Lee
Seoul National University, Seoul, Korea
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Woo-Sik Kim,
Woo-Sik Kim
Korea Gas Corporation, Ansan, Korea
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Dongil Kwon
Dongil Kwon
Seoul National University, Seoul, Korea
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Jang-Bog Ju
Seoul National University, Seoul, Korea
Jung-Suk Lee
Seoul National University, Seoul, Korea
Jae-Il Jang
Frontics, Inc., Seoul, Korea
Woo-Sik Kim
Korea Gas Corporation, Ansan, Korea
Dongil Kwon
Seoul National University, Seoul, Korea
Paper No:
IPC2002-27180, pp. 429-435; 7 pages
Published Online:
February 24, 2009
Citation
Ju, J, Lee, J, Jang, J, Kim, W, & Kwon, D. "Metallurgical and Mechanical Features of API 5L X65 Pipeline Steel Weldment." Proceedings of the 2002 4th International Pipeline Conference. 4th International Pipeline Conference, Parts A and B. Calgary, Alberta, Canada. September 29–October 3, 2002. pp. 429-435. ASME. https://doi.org/10.1115/IPC2002-27180
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