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:
Sep. 25, 2007
Filed:
Aug. 30, 2004
Satoshi Ohtsuka, Higashi-Ibaraki-gun, JP;
Shigeharu Ukai, Higashi-Ibaraki-gun, JP;
Takeji Kaito, Higashi-Ibaraki-gun, JP;
Takeshi Narita, Higashi-Ibaraki-gun, JP;
Masayuki Fujiwara, Kobe, JP;
Satoshi Ohtsuka, Higashi-Ibaraki-gun, JP;
Shigeharu Ukai, Higashi-Ibaraki-gun, JP;
Takeji Kaito, Higashi-Ibaraki-gun, JP;
Takeshi Narita, Higashi-Ibaraki-gun, JP;
Masayuki Fujiwara, Kobe, JP;
Japan Nuclear Cycle Development Institute, Ibaraki-Ken, JP;
Abstract
An oxide dispersion strengthened martensitic steel excellent in high-temperature strength having residual α-grains can be manufactured by a method comprising mixing either element powders or alloy powders and a YOpowder; subjecting the resulting mixed powder to mechanical alloying treatment; solidifying the resulting alloyed powder by hot extrusion; and subjecting the resulting extruded solidified material to final heat treatment involving normalizing and tempering heat treatment to thereby manufacture an oxide dispersion strengthened martensitic steel in which YOparticles are dispersed in the steel, wherein αto γtransformation is not allowed to occur during the described hot extrusion and the proportion of residual α-grains in which oxide particles are finely dispersed in high density is increased by controlling the mixture ratio of the powders for the mechanical alloying treatment.