Nippon Steel Sumitomo Metal Corporation

Tsutomu Shima

Kazuhiro Uchida

Shunichi Otsuka

Takuya Hanada

Masami Sakiyama

A method of producing a metal pipe which can suppress quenching defects is provided. In the method, a bend of the metal pipe is straightened by a straightening machine. Next, both pipe end portions of the metal pipe whose bend has been straightened are cut off by a pipe cutting apparatus. Next, a plurality of the metal pipes whose both pipe end portions have been cut off are aligned in the axial direction thereof to be conveyed to a quenching apparatus, and the metal pipes are quenched by being cooled after being heated by induction heating.

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Tokyo, Japan

Tsutomu Shima