Abstract:The novel martensitic heat-resistant steel G115 is a new type of martensitic heat-resistant steel developed by Iron and Steel Research Institute for more than ten years. It is the only optional material for the national 630℃ advanced ultra-supercritical coal-fired power plant demonstration project. In this paper, the hot extrusion of G115 large-diameter thick wall seamless steel tube with 36000 tons vertical extruder is used. The key manufacturing technologies of G115 large-diameter thick wall steel pipe are discussed, including raw material preparation, blank making, hot extrusion forming and heat treatment. At the same time, the microstructure and properties of the finished steel pipe are inspected. The results show that the surface quality of the steel pipe is good, and the microstructure and properties meet the standard requirements。At present, the process has been solidified, and G115 steel pipes can be extruded in batches, providing a solid material foundation for the national 630 ℃ demonstration power station.
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