On December 3, 2021, the ultra-thin stainless steel seamless steel pipe with an outer diameter of 610 mm, a wall thickness of 1.8 mm, and a length of 8 meters developed by JSZX Energy Equipment Technology Corporation was successfully rolled off the production line on the self-developed new cold-rolling pipe mill. Pass the inspection items specified in the trial production plan.
The out-of-roundness, unevenness of wall thickness and length of the outer diameter are better than those in the trial-manufacturing plan, and other performance indicators also meet the requirements of the trial-manufacturing plan.
First in the world, extremely difficult
This ultra-thin-walled steel pipe is the world's first large-diameter thin-walled seamless steel pipe with a diameter-to-wall ratio of more than 300 produced by rolling technology. "Diameter-to-wall ratio" refers to the outer diameter of the stainless steel pipe divided by the wall thickness. The larger the value, the more difficult the production. Previously, it was very difficult to manufacture seamless steel pipes with a "diameter-to-wall ratio" of less than 80 due to factors such as equipment, materials, and technology.
According to Ma Xiaojun, deputy chief engineer of JSZX, after years of hard work, the R&D team successfully developed a new type of cold-rolled tube equipment after overcoming countless process problems. Compared with the traditional process, this new type of rolling mill for rolling thin-walled seamless steel pipes has significant advantages such as high yield, low energy consumption, simplified process flow, and low requirements for raw steel pipes.
JSZX is a national key high-tech enterprise. It has been focusing on the research and development and manufacturing of stainless steel pipes for more than 30 years. Its special stainless steel pipe fittings are widely used in nuclear power, petrochemical, photovoltaic technology and other fields. It has participated in China`s nuclear power innovation and development. Achievement-The construction of "Hualong No. 1" provides the manufacturing and follow-up services of stainless steel seamless steel pipes for the largest Sino-Russian nuclear energy cooperation project, and is in a leading position in the same industry in China.
The products developed by it also have excellent performance in the civil market. The 0.2mm ultra-thin-walled stainless steel seamless pipes that went offline at the beginning of the year can be used as water pipes instead of galvanized pipes, PVC pipes, and copper pipes with higher safety performance. , The cost is lower.
According to Ma Xiaojun, recently, there has been a new breakthrough in the thickness of the pipe wall. The 0.08 mm ultra-thin-wall stainless steel seamless steel pipe has been successfully started commercial production.