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:
Mar. 02, 2004
Filed:
Nov. 01, 2001
Tatsuo Yoshii, Wakayama, JP;
Noriaki Nagao, Himeji, JP;
Shinji Tsuge, Nishinomiya, JP;
Hideharu Ohmae, Toyonaka, JP;
Other;
Abstract
This invention provides a steel sheet for a mask frame which maintains a tension-type color CRT shadow mask under tension. The steel sheet has a steel composition consisting essentially of, in mass %, C: 0.03-0.30%, Si: at most 0.30%, Mn: 0.05-1.5%, P: at most 0.05%, S: at most 0.02%, Mo: 0.02-0.50%, V: 0.02-0.20%, Al: at most 0.10%, N: 0.0040-0.0200%, optionally one or two or more of Cu: at most 1.0%, Ni: at most 1.0%, Cr: at most 2.0%, W: at most 1.0%, B: at most 0.003%, Ti: at most 0.030%, and Nb: at most 0.030%, and a balance of iron and unavoidable impurities, with Al≦(7.0)N, and having a metal structure in which the ferrite grain size is at most 15 micrometers and the ferrite volume ratio is at most 90%. The steel sheet is manufactured by hot rolling of a slab having the above-described steel composition under the conditions of a finishing temperature of 820-950° C. and a coiling temperature of 400-700° C.