According to experts, seamless tube, seamless steel tube is mainly done through the stretch-reducing, and tension-reducing process of a hollow base material without a continuous mandrel rolling process. Seamless Experts point out that in ensuring the quality of the mother under the premise of pipe welding, pipe tension-reducing technique is to pipe the whole heated to 950 degrees Celsius, and then by tension reducing mill (tension reducing mill a total of 24 times) rolling made from a variety of diameter and wall thickness of the finished pipe. Seamless experts said, using this process is produced by an ordinary hot-rolled steel and are essentially the difference between high-frequency welded tube, through the furnace heating the weld and the parent microstructure and mechanical properties can be achieved exactly the same. In addition, seamless multi-pass through the experts pointed out that the tension reducing mill rolling and automation make the dimensional accuracy of steel (especially tube-precision roundness and wall thickness) is better than the same seamless pipe. According to Tsunehiro seamless experts, the world's developed countries the production of fluid pipe, boiler tube seamless pipe has been extensive use of technology, along with the development of society, the domestic hot-rolled profile tube welding what is gradually replaced by high-quality seamless pipe of the the situation has taken shape.

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