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:
May. 07, 1985
Filed:
Oct. 19, 1981
Tadashi Sawatani, Tokyo, JP;
Mitsuo Ishii, Hikari, JP;
Hirofumi Yoshimura, Munakata, JP;
Jirou Harase, Munakata, JP;
Nippon Steel Corporation, , JP;
Abstract
The ferritic stainless steel sheet involves a problem that the ridging is likely to generate at the forming step, such as the deep drawing step. The ridging is believed to be caused by a band structure in the hot rolled band, which structure exerting an influence on the formability of a cold rolled sheet. The ridging is prevented in the present invention by means of the combination of the three technical measures: incorporating aluminum into a ferritic stainless steel; heating a slab to a low temperature of 1200.degree. C. or less; and, carrying out a drastic hot rolling of at least one pass with the draft of 20%/pass or more. As a result of these technical measures, the structure of a hot rolled band is made and uniform and thus both the formability and anti-ridging property are enhanced.