1 National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China 2 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China 3 South China Branch of National Oil & Gas Piping Network Corporation, Guangzhou 510620, China 4 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract: Pipeline construction is constantly developing towards higher strength, higher toughness and larger-diameter in order to improve the economy of oil and gas transportation, to ensure the reliability of the oil and gas transportation pipeline system. X80 is the most widely used high-grade pipeline steels. The safety issues related to the girth welds are receiving more and more attention due to the failure accidents involved girth welds in recent years. Research on the microstructure and properties of X80 pipeline steel welded joints and the causes of joint cracks has also been intensified. This article analyzes the research results about the microstructure and properties of X80 pipeline steel welded joints, summarizes the relevant cracking mechanisms performance methods and preparation process for reference in related research or engineering applications. Girth welds cracking is the results of a combination of factors such as microstructure, stress, and hydrogen. The factors affecting hydrogen-induced cracking and related law can be summarized as follows: (1) heat input affects the quality of the welded joint directly; (2) coarse structure of the heat-affected zone is prone to local softening; (3) X80 pipeline steel has a tendency to crack than X70 great and lower great due to the martensitic in the heat-affected zone, post heat treatment is beneficial to suppress hydrogen-induced cracking; (4) the location of crack nucleation: the interface of inclusions, the interface between ferrite and M-A island and internal of M-A island. We suggest in the paper two countermeasures against hydrogen embrittlement, one is controlling the element composition and content, while the other is applying appropriate welding method & optimizing welding parameters.
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