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:
Oct. 16, 1990
Filed:
Apr. 11, 1989
Takanari Okuda, Mito, JP;
Shigeo Nomura, Mito, JP;
Itaru Shibahara, Mito, JP;
Yuji Enokido, Mito, JP;
Masayuki Fujiwara, Kobe, JP;
Toshio Nishida, Kobe, JP;
Hiroshi Teranishi, Kobe, JP;
Susumu Hirano, Amagasaki, JP;
Aturou Iseda, Nishinomiya, JP;
Motoharu Nakajima, Nishinomiya, JP;
Doryokuro Kakunenryo Kaihatsu Jigyodan, Tokyo, JP;
Kobe Steel, Ltd., Hyogo, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
A dispersion strenghened ferritic steel having excellent ductility and toughness which has been heat treated to produce a matrix having a tempered martensitic structure composed of 0.05 to 0.25% by weight of carbon, 0.1% by weight or less of silicon , 0.1% by weight or less of manganese, 8 to 12% by weight of chromium, 0.1 to 4.0% by weight in total of molybdenum and tungsten, and 0.02% by weight or less of oxygen (exclusive of oxide particles) with the balance being iron and inevitable impurities and, homogeneously dispersed in the matrix, composite oxide particles comprising Y.sub.2 O.sub.3 and TiO.sub.2 in an amount of 0.1 to 1.0% by weight in total of Y.sub.2 O.sub.3 and TiO.sub.2 and a TiO.sub.2 to Y.sub.2 O.sub.3 molar ratio of 0.5 to 2.0.