This paper introduces a high-strength, high-toughness, and low-hydrogen electrode (CH E657G X) specifically developed for welding X80 pipeline steel. The electrode demonstrates outstanding physical and chemical properties during the welding process, ensuring it meets all performance requirements for engineering applications. Through a combination of theoretical analysis and practical application, the study investigates the factors that influence the electrode's mechanical properties, particularly its strength and impact toughness.
1. Introduction
Pipeline transportation is widely recognized as the most efficient and cost-effective method for moving large volumes of oil and natural gas over long distances. It offers advantages such as economic efficiency, safety, high productivity, energy conservation, continuous operation, and minimal environmental impact. As the fifth major transportation mode after roads, railways, waterways, and air transport, pipelines are continuously evolving toward longer distances, larger diameters, higher strength, and greater toughness. Currently, X70-grade pipeline steel is commonly used in both domestic and international projects, while some long-distance pipelines are beginning to adopt X80-grade steel. Globally, the total length of X80 pipelines is only 1,750 km. However, in China, the second line of the West-East Gas Pipeline project spans approximately 4,800 km, significantly increasing the demand for X80 steel and its compatible welding materials. This has raised new and higher standards for both the steel and the welding consumables used in construction.
In the production of high-strength welded pipes, one of the main challenges is the reduction in strength and toughness of the weld metal and heat-affected zone. Controlling the weld quality is a critical issue in the development and use of high-strength welded pipes. Our company has consistently aligned with market demands, investing significant resources into the research and development of welding materials for pipeline steels. Since the late 1980s, we have been developing welding consumables for X60 pipeline steel, followed by X70 in 2001, and completed comprehensive research on X80 pipeline steel welding materials by 2008. Today, our factory’s CH E657GX welding rod has entered mass production. After being tested by users, it has received positive feedback for its excellent welding performance and ability to fully meet the requirements of X80 steel pipe welding in the second-line West-East Gas Pipeline project.
2. X80 Pipeline Steel and Its Supporting Electrode
(1) Technical Requirements of X80 Pipeline Steel: The technical specifications for the X80 pipeline steel used in the second line of the West-East Gas Pipeline include specific chemical compositions and mechanical properties, as outlined in Table 1 and Table 2 respectively.
For more detailed information, please refer to the attached document or read the 18th issue of Metalworking (Hot Processing).
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