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:
Nov. 18, 2014
Filed:
Mar. 30, 2011
Yusaku Maruno, Tokai, JP;
Seunghwan Park, Mito, JP;
Yoshihisa Kiyotoki, Hitachinaka, JP;
Shin Kumagai, Tokai, JP;
Yusaku Maruno, Tokai, JP;
Seunghwan Park, Mito, JP;
Yoshihisa Kiyotoki, Hitachinaka, JP;
Shin Kumagai, Tokai, JP;
Hitachi-GE Nuclear Energy, Ltd., Ibaraki, JP;
Abstract
The invention provides a valve which suppresses a continuous corrosion of a chemical compound phase such as an eutectic carbide or the like in a valve seat, and improves a corrosion resistance, an impact resistance and an erosion resistance of the valve seat. The invention disperses a chemical compound phase such as the eutectic carbide or the like crystallizing in a dendrite gap as a granular shape or a blocky shape which is equal to or less than about 100 μm, by moving a tool rotating in a crimped state by a load application to a vertical direction to a surface of the valve seat so as to carry out a friction stir processing, and forming a weld metallographic structure of a surface layer portion of the valve seat as a cubic.