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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 10738384 B1

PDFFull Text
Date of Patent:
Aug. 11, 2020

Filed:

Aug. 29, 2016

Surface-treated steel sheet for fuel tanks

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Hiromasa Shoji, Tokyo, JP;

Taihei Kaneto, Tokyo, JP;

Masahiro Fuda, Tokyo, JP;

Hironori Sato, Tokyo, JP;

Natsuko Sugiura, Tokyo, JP;

Yuji Yamaguchi, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
B32B 15/01 (2006.01); C23C 26/00 (2006.01); C23C 28/00 (2006.01); C23C 22/07 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C21D 9/46 (2006.01); C21D 8/02 (2006.01); C25D 3/22 (2006.01); C21D 9/48 (2006.01); B05D 7/14 (2006.01); B05D 7/24 (2006.01); B05D 7/00 (2006.01); C22C 18/00 (2006.01); C23C 22/82 (2006.01); B32B 15/098 (2006.01); B32B 15/04 (2006.01); C23C 30/00 (2006.01); B32B 15/08 (2006.01); B32B 15/095 (2006.01); B32B 15/085 (2006.01); B32B 15/18 (2006.01); B60K 15/03 (2006.01);
U.S. Cl.
CPC ...
C23C 28/34 (2013.01); B05D 7/14 (2013.01); B05D 7/24 (2013.01); B05D 7/52 (2013.01); B32B 15/01 (2013.01); B32B 15/013 (2013.01); B32B 15/04 (2013.01); B32B 15/043 (2013.01); B32B 15/08 (2013.01); B32B 15/085 (2013.01); B32B 15/095 (2013.01); B32B 15/098 (2013.01); B32B 15/18 (2013.01); C21D 8/0247 (2013.01); C21D 9/46 (2013.01); C21D 9/48 (2013.01); C22C 18/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C23C 22/07 (2013.01); C23C 22/82 (2013.01); C23C 26/00 (2013.01); C23C 28/00 (2013.01); C23C 28/321 (2013.01); C23C 28/3225 (2013.01); C23C 28/345 (2013.01); C23C 30/00 (2013.01); C23C 30/005 (2013.01); C25D 3/22 (2013.01); B60K 2015/03046 (2013.01); C23C 2222/10 (2013.01); Y10T 428/12556 (2015.01); Y10T 428/12562 (2015.01); Y10T 428/12569 (2015.01); Y10T 428/12854 (2015.01); Y10T 428/12951 (2015.01); Y10T 428/12972 (2015.01); Y10T 428/12993 (2015.01);
Abstract

A surface-treated steel sheet for fuel tanks, including a Zn—Ni alloy plating layer on one surface or both surfaces of a steel sheet; and a trivalent chromate covering layer or a chromate-free covering layer on the Zn—Ni alloy plating layer, wherein, in a surface outermost layer of the trivalent chromate covering layer or the chromate-free covering layer, concavities, of which a depth from an arithmetic average height of a cross-sectional curve of the surface outermost layer is more than or equal to 0.1 μm, exist in a proportion of 50 to 1000 concavities/mm2 and at an area ratio of 20 to 80% to a surface area of the steel sheet.

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