DEVELOPMENT OF TECHNOLOGIES FOR MANUFACTURING SEAMLESS STEEL TUBES AND PIPES

Introduced in the paper is the general development of manufacture technologies for seamless steel tubes and pipes concerning such aspects as piercing, elongation, pipe-rolling, reducing (sizing) and tooling lubrication etc. The advanced coned piercing mill not only makes it possible to pierce materials which were hard to be dealt with previously, but also provides a higher product accuracy and a larger product-mix as well; the development of the drive guide-roll, tooling and lubrication technique concerning the elongator and progresses in such techniques as analysis, inspection and control upgrade the varieties and materials of the products; the mandrel pipe mill has been developing toward large-sized pipe production and compact mill configuration.