[Abstract] This paper presents a high-strength, high-toughness, and low-hydrogen electrode (CH E657G X) specifically developed for X80 pipeline steel. The electrode demonstrates excellent physical and chemical properties during the welding of X80 steel, meeting all performance requirements for engineering applications. Additionally, through a combination of theoretical analysis and practical testing, the factors influencing the electrode’s mechanical properties—particularly its strength and impact toughness—are thoroughly examined.
1. Introduction
Pipeline transportation is considered one of the most efficient and economical methods for moving oil and natural gas over long distances. It offers advantages such as cost-effectiveness, safety, high efficiency, energy savings, continuous operation, and minimal environmental impact. As a result, it has become the fifth major mode of transportation after roads, railways, waterways, and air transport. The global trend in pipeline development is moving toward longer distances, larger diameters, higher strength, and better toughness.
Currently, X70 steel grade is widely used in pipeline construction both domestically and internationally. However, some long-distance pipelines are beginning to adopt X80 steel due to its superior mechanical properties. Globally, the total length of X80 pipelines is only around 1,750 km. In contrast, China's second-line natural gas pipeline project spans approximately 4,800 km, significantly increasing the demand for X80 steel and its corresponding welding materials. This has raised new and higher standards for both the steel and the welding consumables used in the process.
In the production of high-strength welded pipes, one of the biggest challenges is the reduction in strength and toughness in the weld metal and heat-affected zone. Controlling weld performance is a critical issue that must be addressed in the development and application of high-strength welded pipes. Our company has consistently aligned with market demands, investing substantial resources in the research and development of welding materials for pipeline steels. Since the late 1980s, we have been working on 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 CH E657GX electrode has entered mass production and has been well-received by users for its excellent welding performance, fully meeting the requirements of the West-East Gas Pipeline's second line project.
2. X80 Pipeline Steel and Its Corresponding Electrode
(1) Technical Requirements of X80 Pipeline Steel: The technical specifications for X80 pipeline steel in the second-line project of the West-East Gas Pipeline include specific chemical compositions and mechanical properties. These are detailed 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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