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:
Aug. 31, 2004
Filed:
Jan. 24, 2002
Andrew Keith Bowskill, Coventry, GB;
Charles Grant Pumell, Coventry, GB;
Iain Robert Whitaker, Coventry, GB;
Federal-Mogul Sintered Products Limited, West Midland, GB;
Abstract
A sintered steel and a method for the manufacture thereof are described, the sintered steel being made by a method comprising the steps of providing a first pre-alloyed steel powder having a composition comprising in weight %: C 0.5-2, Cr 3.5-6, (2 Mo+W) 12-22, V 0.5-5, Co 0-12, Mn 0.1-0.5, Si 0.1-0.6, Fe balance apart from incidental impurities; providing a second pre-alloyed steel powder having a composition comprising in weight %: C 0.3-0.7, Cr 3-5.5, Mo 1-2.5, V 0.3-1.5, W 0-2, Mn 0.1-0.6, Si 0.8-1.2. Fe balance apart from incidental impurities; mixing together from 2 to 50 weight % of the first pre-alloyed steel powder with 98 to 50 weight % of the second pre-alloyed steel powder optionally up to 60 weight % of an iron powder and with carbon powder such that the final carbon content of the matrix of the sintered steel powder is a maximum of 1.1 weight %1; compacting the mixture and sintering to form the sintered steel.