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:
Apr. 10, 2001
Filed:
Dec. 16, 1999
Ki-Ho Kim, Kyungsangbook-do, KR;
Gyosung Kim, Kyungsangbook-do, KR;
Chang-Hoon Lee, Kyungsangbook-do, KR;
Sung-Yul Huh, Kyungsangbook-do, KR;
Boeng-Joon Kim, Kyungsangbook-do, KR;
Abstract
A method for manufacturing a thin cold rolled inner shield steel sheet for use in a braun tube is disclosed. With this method, a steel sheet with superior magnetic field shielding properties can be manufactured by carrying two steps of cold rolling without adding an expensive alloy element, and without using a special decarburizing facility such as OCA. The method includes the following steps. There is prepared a steel slab composed of, in wt %, 0.0025% or less of C, 0.05-0.25% of Mn, 0.05-0.15% of Si, 0.015 or less of Al, and a balance of Fe and other impurity elements. Then a hot rolling is carried out on the steel slab at a temperature of 910° C. or above. Then a first cold rolling is carried out, and a first annealing is carried out at above a recrystallization temperature. Then a second cold rolling is carried out at a reduction ratio of 25-45%.