日本神户制钢公司研制出生产无缝钢管管坯的新方法。按照这个工艺,连铸机铸出的扁坯先轧成大致为钢管壁厚的厚度,然后输送到辊式压力机上,管坯在压力机上绕芯棒弯曲,坯料两边用电焊或炉焊马上焊接在一起形成管坯,然后于热状 Kobe Steel Company of Japan developed a new method of producing seamless steel tube blank. According to this process, the slab cast by the continuous casting machine is firstly rolled into a thickness roughly equal to the thickness of the steel pipe wall, then conveyed to a roller press, the blank tube is bent around the mandrel on the press machine, and both sides of the blank are welded by welding or furnace welding immediately Together to form a tube, and then in hot