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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.:

US 10011888 B1

PDFFull Text
Date of Patent:
Jul. 03, 2018

Filed:

Sep. 10, 2014

Cold-rolled steel sheet for vitreous enameling and its named enameled product thereof

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Toshimasa Tomokiyo, Kitakyushu, JP;

Shintaro Yamanaka, Kitakyushu, JP;

Kengo Takeda, Kimitsu, JP;

Satoshi Nishimura, Kitakyushu, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolach & Birch, LLP

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/16 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/20 (2006.01); C22C 38/26 (2006.01); C22C 38/60 (2006.01); C21D 8/02 (2006.01); C21D 9/56 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C21D 8/0284 (2013.01); C21D 9/56 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/26 (2013.01); C22C 38/60 (2013.01); C21D 2211/004 (2013.01); C21D 2211/005 (2013.01);
Abstract

A cold-rolled steel sheet for vitreous enameling has a predetermined chemical composition, in which a number density of Fe—Mn—Nb-based composite oxides having a diameter of 0.2 μm to 10 μm is 2×10particle/mmto 1×10particle/mm; a fatigue limit ratio is higher than 0.42 after performing a heat treatment with an applied tensile strain of 10% at a heating temperature of 830° C. for a holding time of 5 minutes; voids are formed between the metallographic structure and the Fe—Mn—Nb-based composite oxides, and an equivalent circle diameter of the voids is 0.1 μm to 0.6 μm; and when each of the voids is approximated as a triangle and a long side of the triangle is set as a base, a value obtained by dividing a length of the base by a height of the triangle is 1.0 to 15.

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