There are three basic processes for hot rolled tubes: ①The ingot or billet is threaded into a hollow thick-walled capillary tube on the piercing machine; ②The capillary tube is rolled thin on the stretching machine and stretched into a waste tube close to the wall thickness of the finished product; ③Rolled on the finishing mill The required finished tube. The tube rolling mill series are represented by the maximum outer diameter of the produced steel tube (see rolling mill). See Table 1 for the production methods of seamless steel pipes. The numbers in parentheses are the creation years.
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