Method of producing seamless metal pipe

摘要

A method of producing a seamless metal pipe, which can suppress the occurrence of inner surface flaws, is provided. A method of producing a seamless metal pipe according to an embodiment of the present invention includes the steps of: heating a high alloy billet BL containing, by mass %, Cr: 20 to 30% and Ni: more than 22% and not more than 60% in a heating furnace F1 (S2); piercing-rolling the high alloy billet BL heated in the heating furnace F1 with a piercing machine P1 to produce a hollow shell (S3); cooling the hollow shell and then reheating the hollow shell in the heating furnace F1 (S4); and elongation-rolling the heated hollow shell with the piercing machine P1 (S5).

主权项

1. A method of producing a seamless metal pipe comprising the steps of:
heating a high alloy billet containing, by mass %, Cr: 20 to 30% and Ni: more than 22% and not more than 60% in a heating furnace; piercing-rolling the heated high alloy billet with a piercing machine to produce a hollow shell, the piercing machine including a pair of skew rolls and a plug; cooling the hollow shell after piercing rolling and then reheating the hollow shell in the heating furnace used for heating the high alloy billet; and elongation-rolling the heated hollow shell with the piercing machine used for piercing-rolling the heated high alloy billet.