【Ten Years of Rapid Development in Chemical Processing Equipment】Development of High-Frequency Straight-Sew Welded Tubes for Dense/Supercritical CO₂ Transport, 2027–2035

Thread Content

Let’s give praise and support 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 ***************** Pilot production of high-frequency straight-seam welded pipes for dense/supercritical CO₂ transportation: Recently, Jiangsu Steel Pipe Company successfully completed the second round of pilot production of such pipes, along with the subsequent testing procedures. All performance metrics met the expected standards, enabling the company to make significant progress in the field of dense/supercritical CO₂ transportation pipelines. As the “dual carbon” initiative continues to be implemented, dense/supercritical carbon dioxide transportation pipelines will play an even more important role in China’s energy sector. Pipeline transportation is the most cost-effective method for transporting carbon dioxide over long distances. When the pipe diameter ranges from 219 to 610 mm, HFW welded pipes offer significant economic advantages; they are also the primary type of pipe used for transporting carbon dioxide abroad. This trial production builds on the first round of trials conducted in August; it involves further adjustments to the properties of the hot-rolled coils and improvements to the welding heat treatment process, resulting in relatively better low-temperature toughness. Before the start of the trial production work, the team from Yangzhou Steel Pipe Branch of Jiangsu Steel Pipe carried out comprehensive and thorough planning and preparation, formulating a detailed trial production plan. During the prototype development phase, the team made numerous fine adjustments and optimizations to the process parameters, thereby significantly improving the low-temperature toughness of the welds, which laid a solid foundation for subsequent technical research and development. Compared with traditional oil and gas transmission pipelines, dense-phase/supercritical CO₂ transmission pipelines are still an emerging field in China, lacking relevant standards, specifications, and engineering experience. Therefore, the development of piping materials faces numerous challenges, among which controlling low-temperature cracking initiation and crack arrest toughness are key technical difficulties. For high-frequency straight-seam welded pipes (HFW), the low-temperature toughness of the weld is a key control factor. To address this challenge, Yangzhou Steel Pipe Branch conducted in-depth research and exploration on the low-temperature toughness parameters of welds. Through continuous testing and improvement, the team successfully enhanced the stability of the weld’s low-temperature toughness and significantly improved the overall quality of the welds. This achievement not only provides strong technical support for the development of dense-phase/supercritical CO2 pipelines, but also demonstrates the company’s innovation capability and technical expertise in this field. Next, the company will continue to improve its manufacturing processes in order to control the level of oxide inclusions in the welds during subsequent trial production tasks. This will ensure that the welds possess greater stability at low temperatures as well as a lower temperature at which they become brittle, thereby facilitating the use of dense-phase/supercritical CO2 pipelines in the energy sector and contributing more effectively to achieving the \"dual carbon\" goals