The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 2018
Filed:
Feb. 22, 2013
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Shunichi Otsuka, Tokyo, JP;
Kazuhiro Uchida, Tokyo, JP;
Takuya Hanada, Tokyo, JP;
Masami Sakiyama, Tokyo, JP;
Tsutomu Shima, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
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.