On December 3, 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 m, developed by ZTE Energy equipment Co., Ltd., was successfully put off the line on a new cold rolling mill developed by ourselves, and successfully passed the inspection project stipulated in the trial production plan.
Its outer diameter non-roundness, wall thickness non-uniformity and length are better than those in the trial-production scheme, and other performance indexes also meet the requirements of the trial-production scheme, and will be displayed as exhibits at the 2021 China Nuclear Energy High quality Development Conference held in Shenzhen.
It is extremely difficult to be the first in the world.
The ultra-thin-walled steel pipe is the first large-diameter thin-walled seamless steel pipe with a diameter-to-wall ratio of more than 300 produced by rolling technology in the world. "diameter-to-wall ratio" refers to the outer diameter of stainless steel pipe divided by wall thickness, the larger the value, the greater the difficulty of production. Previously, it was very difficult to manufacture seamless steel tubes with a diameter-to-wall ratio of more than 80 due to the restriction of equipment, materials, technology and other factors.
Ma Xiaojun, deputy chief engineer of ZTE Energy equipment Co., Ltd., said that after several years of hard work, the R & D team successfully developed a new type of cold-rolled tube equipment after overcoming numerous technological problems. Compared with the traditional process, this new type of rolling mill has the advantages of high yield, low energy consumption, simplified technological process and low requirements for raw material steel pipe.
At present, Zhongxing Energy equipment Co., Ltd. has developed a number of multi-model, multi-specification new cold rolling pipe mill, the production of ultra-thin-walled seamless steel pipe products can meet the various needs of the market.
The variety is rich and the meritorious service is made repeatedly.
Zhongxing Energy equipment Co., Ltd. is a national key high-tech enterprise. For more than 30 years, it has focused on the R & D and manufacture of stainless steel tubes. Its stainless steel special fittings are widely used in nuclear power, petrochemical, photovoltaic and other fields. It has participated in the construction of Hualong No.1, a major landmark achievement in China's nuclear power innovation and development. To provide manufacturing and follow-up services for stainless steel seamless steel tubes for the largest nuclear energy cooperation project between China and Russia, which is in a leading position in the same industry in China.
And its research and development products also have excellent performance in the civil market, such as the 0.2mm ultra-thin-walled seamless stainless steel pipe that came off the line at the beginning of this year can be used as a tap water pipe to replace galvanized pipe, PVC pipe and copper pipe, with higher safety performance and lower cost. This is also the ZTE energy equipment in the field of large-diameter stainless steel seamless pipe to fill the domestic gap, instead of foreign imports, another production innovation in the field of ultra-thin-walled stainless steel seamless pipe, marking the subversive development of manufacturing technology in the field of stainless steel seamless pipe.
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