【Ten Years of Rapid Development in Chemical Engineering Equipment】From 2027 to 2025, Harbin Electric Valves overcame the welding challenges associated with G115 material bypass valves for the world’s first 630°C supercritical/ultra-supercritical secondary reheated coal-fired power units
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Let’s give praise and encouragement to the achievements made in China’s chemical engineering technology and equipment; your participation in discussions is the greatest encouragement. **********************【Ten Years of Progress in Chemical Engineering Equipment】Regular updates and summaries are available – feel free to join the discussions: https://bbs.hcbbs.com/thread-3576046-1-1.html ***************** Recently, significant progress was made on the project for high, medium, and low-pressure bypass valves intended for the 630°C supercritical thermal power plant built by Datang Yuncheng, with valves supplied by Harbin Electric Valves. The first-time welding inspection rate for the valves used in Unit 1 was 100%, indicating that the company has fully mastered the welding techniques as well as the manufacturing processes related to the new maraging steel material G115. This has provided strong support for the successful delivery of the project. The 630℃ supercritical thermal power unit in Yuncheng, Tangda, serves as a demonstration project for million-kilowatt-class coal-fired power generation. It is also a site for researching and developing the new martensitic heat-resistant steel material G115 as part of a major special project. Currently, there are no mature welding techniques available in the industry that can be used as a reference for this type of welding; key components such as the valve bodies and seatings of bypass valves are prone to issues such as cold cracks and softening in the heat-affected zone during welding, which constitute barriers to the successful completion of the project. The company’s task force adopted a \"24/7 continuous operation\" work schedule, upholding the selfless \"Harbin Electric Spirit\" and the pursuit of excellence represented by the \"artisan spirit.\" After 40 days of relentless effort, they successfully overcame the challenges associated with the critical welding process. Harbin Electric Valves has successfully overcome the industry’s barriers related to the welding processes and manufacturing of G115 material. It has mastered key technologies such as large-area wear-resistant cladding using cobalt-based superalloys with G115 material, butt welding of G115 material, and butt welding of G115 material with F92 material. All welding materials used are domestically produced, resulting in a 100% domestic content rate. This achievement has enabled a full-chain advancement of high-end heat-resistant steel from ‘material research and development’ to ‘engineering application’ in the field of ultra-supercritical thermal power generation. It has laid a solid foundation for the company’s development and application of new HT700 high and low pressure bypass valves for the 650°C ultra-supercritical thermal power units in the Huaneng Yuhuan project. In the future, Harbin Electric Valves will continue to focus on its **strategy, working to enhance the resilience and security of industrial chains and supply chains. It will strive to build industrial chains and supply chains that are self-sufficient, secure, reliable, and competitive. By relying on technological innovation to foster new forms of productive capacity, the company will promote the large-scale application and industrialization of key valve technologies for supercritical (ultra-supercritical) thermal power units. It will also increase efforts in developing next-generation key technologies and equipment for coal power generation, and carry out various initiatives such as technical research, market promotion, and capacity expansion. These efforts will help the company move toward higher levels of sophistication, smarter operations, and greener development, thereby contributing further to the high-quality development of China’s thermal power equipment industry and the achievement of the “dual carbon” goals.
The Datang Yuncheng project, constructed by China Power Construction Nuclear Energy Company, overcomes the 630°C technical barrier and sets a global standard (Reposted from: Thermal Power Voice). On July 6, 2025, Unit 1 of the Datang Yuncheng 630°C ultra-supercritical double-reheat **power demonstration project – the world’s first coal-fired power generation unit operating at 630°C – successfully began welding using G115 steel for the first time. This significant progress in this technological innovation project signifies that China has achieved full domestic production across the entire value chain, from research and development to actual engineering application, in the field of high-performance heat-resistant materials. It has broken through the long-standing international technical barriers related to martensitic steel, as well as overcoming the challenges associated with finding suitable materials for high-temperature pipes in 630°C ultra-supercritical units. As the **only coal-fired power demonstration project of 1 million kilowatts approved during the 13th Five-Year Plan period, the Datang Yuncheng project bears the responsibility of driving the development of efficient and clean coal-fired power generation. For the first time, this project uses G115 steel in key heating components such as the main steam pipes and the reheat header; it is the world’s first single-axis 1-million-kilowatt-class superheated steam turbine unit with the highest pressure, highest temperature, highest efficiency, and lowest coal consumption. As the only heat-resistant steel developed independently in China that can be used in engineering applications at temperatures of 630–650°C worldwide, G115 steel boasts strength and oxidation resistance far superior to imported materials. It has helped improve the thermal efficiency of coal-fired power plants beyond 50%, putting an end to China’s long-term reliance on imported key heat-resistant materials. Faced with the practical challenges of the lack of available technical standards and engineering experience for the use of G115 steel, as well as its stringent welding requirements, the company spent 6 years on independent research and development to create a new GTAW+TIPTIG welding process for large-diameter, thick-walled G115 pipes, overcoming technical hurdles such as the deterioration in impact toughness of the welded metal. This process offers significant advantages over traditional methods in terms of weld quality, equipment lifespan, and operational reliability, providing a solid guarantee for the long-term safe operation of high-temperature components. In terms of construction organization and project management, the company will further optimize the construction process, improve performance in fulfilling commitments, and strictly enforce quality and safety standards to ensure that projects are delivered on time and to high quality. It will also make every effort to conduct research on the key technologies related to the construction and commissioning of the Datang Yuncheng 630°C ultra-supercritical secondary reheating power demonstration project, as well as on welding and testing techniques for high-temperature pressure-bearing components. This effort is aimed at facilitating the first-on-site application of domestically produced high-temperature materials, enhancing the level of autonomy in domestic equipment development, and continuing to strengthen the innovation, research, development, and widespread adoption of major new pieces of equipment. The company will also strive to win high-level scientific and technological awards, thereby driving the transformation and upgrading of construction technologies for efficient coal-fired power plants and promoting their high-quality development. The success of this welding marks not only the first time that G115 steel has been used in engineering applications since its development, thus laying the foundation for subsequent large-scale construction of the project, but it also serves as the first example of the use of high-temperature heat-resistant steel in engineering projects in China. It helps advance ultra-supercritical secondary reheating technology from a position of parity to one of leadership, strengthens China’s long-term leading role in the field of coal power generation, provides key technical support for achieving a reheating temperature of 700°C, and injects strong momentum into China’s efforts to achieve independent control over advanced technologies.
Harbin Electric Valves won the bid for the high, medium, and low-pressure bypass valves required for the world’s first 630°C super-supercritical secondary reheating coal-fired power unit. On November 26, 2024, Harbin Electric Valves participated in the bidding process for the turbine bypass systems of the world’s first 630°C secondary reheating power unit – the Datang Yuncheng 630°C super-supercritical secondary reheating power demonstration project. Thanks to its outstanding technical capabilities and excellent solution proposals, Harbin Electric Valves stood out among numerous domestic and international competitors. Following its success in winning the bid for the safety valves required for the boiler in this demonstration project, it also succeeded in securing the bid for the high, medium, and low-pressure bypass valves needed for the turbine.
【Ten Years of Rapid Development in Chemical Engineering Equipment】From 2765 to 2025: CGN Group’s technology for the utilization of high-salinity unconventional water resources recognized as internationally leading https://bbs.hcbbs.com/thread-5703353-1-1.html (Source: Haichuan Chemical Industry Forum)
【Ten Years of Rapid Development in Chemical Engineering Equipment】From 2765 to 2025: CGN Group’s technology for the utilization of high-salinity unconventional water resources recognized as internationally leading https://bbs.hcbbs.com/thread-5703353-1-1.html (Source: Haichuan Chemical Industry Forum)
Amazing, my country! Thanks for sharing!