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:
Dec. 02, 2014
Filed:
Mar. 31, 2011
Applicant:
Masahide Kawabata, Moka, JP;
Inventor:
Masahide Kawabata, Moka, JP;
Assignee:
Hitachi Metals, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/26 (2006.01); C22C 38/22 (2006.01); C22C 38/48 (2006.01); C22C 38/44 (2006.01); F01N 13/16 (2010.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C21D 6/00 (2006.01); C22C 38/00 (2006.01);
U.S. Cl.
CPC ...
C22C 38/26 (2013.01); F01N 2530/00 (2013.01); C22C 38/02 (2013.01); C21D 2211/005 (2013.01); F01N 13/16 (2013.01); C22C 38/48 (2013.01); C22C 38/44 (2013.01); C22C 38/04 (2013.01); C21D 6/002 (2013.01); C22C 38/001 (2013.01);
Abstract
A heat-resistant, ferritic cast steel having excellent room-temperature toughness, which has a composition comprising by mass 0.32-0.48% of C, 0.85% or less of Si, 2% or less of Mn, 1.5% or less of Ni, 16-19.8% of Cr, 3.2-5% of Nb, Nb/C being 9-11.5, 0.15% or less of N, 0.002-0.2% of S, and 0.8% or less in total of W and/or Mo, the balance being Fe and inevitable impurities, and a structure in which a eutectic (δ+NbC) phase formed from a δ phase and Nb carbide (NbC) has an area ratio of 60-90%, and an exhaust member made thereof.