SEAMLESS-METAL-PIPE MANUFACTURING METHOD

摘要

Provided is a seamless-metal-pipe manufacturing method whereby cracking of the inner surface of the pipe is inhibited. The seamless-metal-pipe manufacturing method in this embodiment is provided with the following steps: a step (S2) in which a high-alloy billet (BL) containing 20-30% chromium and more than 22% but no more than 60% nickel, by mass, is heated in a furnace (F1); a step (S3) in which hollow tube stock is produced by using a piercer (P1) to pierce/roll the high-alloy billet (BL) that has been heated in the furnace (F1); a step (S4) in which the hollow tube stock is cooled and then heated in the furnace (F1) again; and a step (S5) in which the piercer (P1) is used to draw/roll the heated hollow tube stock (HS).