Zhongxing located in Haimen, Jiangsu Province, has successfully developed the ultra-thin wall stainless steel seamless pipe, which fills the domestic gap and breaks the foreign monopoly, marking the subversive development of the manufacturing technology in the field of stainless steel seamless pipe in China.

The thickness of the stainless steel seamless tube with ultra-thin wall is only 0.2 mm, which is almost the same as that of two pieces of A4 paper. Zhu Weifei, deputy general manager of ZTE energy equipment, said: "because of the difficulty of process control, the ultra-thin wall seamless pipe has been monopolized by European and American countries for a long time. Among the ultra-thin wall seamless pipes produced by domestic traditional process, 0.6mm is already the limit."

 

Due to the limitation of single pass reduction of area, the traditional production of cold-rolled stainless steel ultra-thin wall seamless pipe needs repeated oiling, cold rolling, degreasing and heat treatment. There are some difficulties and pain points, such as long process flow, high energy consumption, low single line output, high cost, etc The ovality and wall thickness uniformity are out of control, so the ultra-thin wall pipe used to be welded pipe, but the welded pipe has the inevitable natural defect - weld. There is a certain probability of leakage in the process of conveying fluid medium, which greatly reduces the overall safety factor of the pipeline system“ Thin walled stainless steel pipes have the advantages of high strength, light weight, corrosion resistance and long service life. China began to promote them more than ten years ago. However, in view of the fact that domestic products are not fully mature, it is difficult to break through the production bottleneck, the price of imported ultra-thin wall pipes remains high, and the market demand has been suppressed. " Company related staff introduction.

 

In recent years, in addition to focusing on nuclear power, aerospace and other fields, Haimen ZTE energy equipment has always taken "nuclear to civilian" as its research and development goal. This time, it took two years to develop new cold rolling technology and equipment, and successfully produced 0.2 mm grade ultra-thin stainless steel seamless pipe with low cost and mass production. The whole process was shortened by 50%, and energy consumption was greatly reduced, In the production process, there is no need to apply oil to remove oil, which is more green and environmentally friendly. This also makes it possible to use stainless steel seamless pipes in heat exchanger pipes, civil stainless steel water pipes, gas pipelines and other application fields“ The imported ultra-thin wall tube can be said to be a sky high price. At present, the price per 200 grams or so on the market is about 100000 yuan. The 0.2mm ultra-thin wall pipe developed by ZTE has been displayed in the 9th International pipe exhibition before, and will be put into mass production this year and officially put into the market. We believe that the ultra-thin wall stainless steel seamless pipe will become another independent R & D product of the company after the large diameter stainless steel seamless pipe and replace the imported products. " Zhu Weifei said. As the drafting unit of a number of national standards and industry standards in the seamless steel pipe field, Haimen ZTE energy equipment is also actively preparing to formulate the national standards for ultra-thin wall pipe to help the industry upgrade and develop.