Production of Round billet for Seamless metal tube and Method for producing Seamless metal tube

摘要

A Round billet is capable of reducing the harm caused to the punch Hole in a method for producing a seamless metal tube through the procedure Mannesmann.The Round Billet (5), for use in a seamless metal tube, to be converted into a seamless Metal Pipe with a Mannesmann process includes a Body having a Hole (6) is formed in the axial direction of the body.The Hole (6) includes an Opening (6) in at least one end Face of the Round Billet (5), and a Conic part (61) that continues to the opening (6a) and whose diameter gradually increases towards the opening (6a).