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:
Jan. 05, 1999
Filed:
Apr. 09, 1997
Applicant:
Inventors:
Motoaki Oyama, Tokyo, JP;
Minoru Yuzuki, Tokyo, JP;
Kazuto Terai, Tokyo, JP;
Yuko Takeuchi, Nagoya, JP;
Hitoshi Hayakawa, Tokai, JP;
Assignees:
Daido Tokushuko Kabushiki Kaisha, Nagoya, JP;
Nippon Kokan Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148519 ; 148521 ; 148530 ; 148534 ;
Abstract
In a method of the present invention for manufacturing a welded clad steel tube, an alloy including a corrosion-resisting or heat-resisting alloy is overlaid on a raw steel tube to manufacture a cold steel tube. Then, a cold or warm working is subjected to the clad steel tube. The clad steel tube is subjected to a heat treatment at a temperature exceeding a recrystallization temperature of the alloy.