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. 19, 1994
Filed:
Jul. 15, 1992
Nobukazu Yamamoto, Hitachi, JP;
Kouichi Matsumoto, Hitachi, JP;
Junjiro Nakajima, Hitachi, JP;
Hideo Maki, Katsuta, JP;
Hiromasa Hirakawa, Hitachi, JP;
Masahisa Inagaki, Hitachi, JP;
Iwao Takase, Toukai, JP;
Nobuhiro Okazaki, Hitachi, JP;
Hideaki Ishizaki, Mito, JP;
Toraki Sakuma, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a method of fabricating a channel box for use in a nuclear reactor, Zr-alloy sheet material is formed into a tubular channel box. The method includes solution heat treatment of the Zr-alloy sheet material including quenching from a temperature at which .beta.-phase is present. After the solution heat treatment, portions of the Zr-alloy sheet are thinned relative to other portions by a non-stressing thinning process, such as chemical etching in a bath. The corrosion resistance imparted by heat treatment is retained, and the heat treatment itself is easily performed on material of uniform thickness.