Steel Tube Knowledge: Development of Seamless Steel Tube with Internal Thread for High Pressure Boiler

Internally-threaded steel pipes are a specialized type of steel tubing characterized by spiral grooves on their inner surface. These internal threads help prevent laminar flow, which often occurs when the fluid inside the pipe moves slowly. By disrupting this flow, the pipes also reduce the formation of steam films on the inner walls, significantly enhancing heat transfer efficiency in boiler water walls and ensuring more uniform wall temperatures. This makes them essential components in high-performance electric boilers. Due to the complex manufacturing process required to produce these pipes, especially for seamless multi-end internal thread applications, mass production is challenging. As a result, only a limited number of manufacturers worldwide have the technical capability to produce such high-quality tubes. The materials commonly used include SA-210A1, SA-210C, SA-213T2, SA-213T12, and 15CrMoG. German company Siemens has further advanced the design by optimizing the internal threading, increasing the spiral angle and thread height, which enhances heat transfer even further. These improved versions are typically made from T12 or T23 materials and are used in ultra-supercritical boiler systems. The standard for internally threaded seamless steel pipes in high-pressure boilers is defined under GB/T, with an English title of "Internally Threaded Seamless Steel Pipe for High Pressure Boilers." It was first issued on August 16, 2006, and became effective on January 1, 2007. The standard is currently active and administered by the China Iron and Steel Association. It was developed by the National Steel Standardization Technical Committee, with contributions from companies such as Shanghai Special Steel Tube Co., Ltd., Metallurgical Industry Information Standard Institute, and Wuxi Zhenda Steel Pipe Manufacturing Co., Ltd. This standard falls under the international classification ICS 77.140.75 and Chinese CCS H48. While no specific international standards are directly adopted, the specification reflects advanced engineering practices tailored for high-efficiency boiler applications.

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