| Issue |
E3S Web Conf.
Volume 329, 2021
4th International Conference on Green Energy and Sustainable Development (GESD 2021)
|
|
|---|---|---|
| Article Number | 01071 | |
| Number of page(s) | 5 | |
| DOI | https://doi.org/10.1051/e3sconf/202132901071 | |
| Published online | 09 December 2021 | |
Analysis of Leakage Cause of L415M Spiral Submerged Arc Welding Pipe
Tubular Goods Research Center of CNPC, Xi'an, Shaanxi, 710077, China
* Corresponding author: xuyanxjtu@163.com.cn
The causes of longitudinal crack in gas pipeline during pressure were analyzed by means of mechanical property test, microstructure analysis, sem analysis and energy spectrum analysis. The results show that the leakage of L415M spiral submerged arc welded pipe is caused by the contact between the base material of steel pipe and low-melting copper alloy in the process of high temperature, resulting in the brittleness of liquid metal. Specifically, when the leakage site of the steel pipe is heated at an abnormal high temperature, copper penetration along the grain boundary causes embrittlement, strength reduction and crack along the grain boundary, finally leading to the crack and leak of the steel pipe.
© The Authors, published by EDP Sciences, 2021
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