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. 28, 2006
Filed:
Sep. 25, 2003
Takeji Kaito, Higashi-Ibaraki-gun, JP;
Shigeharu Ukai, Higashi-Ibaraki-gun, JP;
Satoshi Ohtsuka, Higashi-Ibaraki-gun, JP;
Toshimi Kobayashi, Amagasaki, JP;
Takeji Kaito, Higashi-Ibaraki-gun, JP;
Shigeharu Ukai, Higashi-Ibaraki-gun, JP;
Satoshi Ohtsuka, Higashi-Ibaraki-gun, JP;
Toshimi Kobayashi, Amagasaki, JP;
Japan Nuclear Cycle Development Institute, Ibaraki-Ken, JP;
Abstract
There is provided a method for producing oxide dispersion strengthened ferritic steel tube by fabricating a raw tube by mixed sintering of a metal powder and an oxide powder and producing a tube of the desired shape by repeating cold rolling and heat treatment for a total of three times or more. The method comprises performing each of the intermediate heat treatments during the cold rolling by a two-step heat treatment consisting of a first step heat treatment of 1100° C. or lower and a second step heat treatment of 1100 to 1250° C. and higher than the first step temperature, and performing the final heat treatment at 1100° C. or higher.