Manufacture of Optimum Cold-drawn Internal-spiral Seamless Steel Tube for Ultra-supercritical Boiler Service

The internal-spiral steel pipe is widely used in the industrial field of manufacture of ultra-supercritical boiler for thermal power plant due to its advantages like quick heat transfer and high efficiency. Compared are the similarities and differences between the ordinary internal-spiral steel pipe and the optimum internal-spiral steel pipe. Described are the drawing principle and technical requirements for the internal-spiral steel pipe. Analyzed are the critical points and the control tips in manufacture of the optimum internal-spiral pipe. The optimum internal-spiral pipe is eventually produced successfully by Changzhou Changbao Jingte Steel Pipe Co., Ltd. by means of improving design of the tooling and dies and optimizing the deformation process. All the parameter indexes of the product are up to the requirements as specified in applicable standard,and the objective quality is also up to the advanced level of similar products as made abroad.