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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 12365958 B1

PDFFull Text
Date of Patent:
Jul. 22, 2025

Filed:

Mar. 27, 2020

Electric resistance-welded steel tube for hollow stabilizer, hollow stabilizer, and manufacturing methods of same

Applicants:

Nippon Steel Corporation, Tokyo, JP;

Nhk Spring Co., Ltd., Yokohama, JP;

Inventors:

Yukinobu Nagata, Tokyo, JP;

Yuki Motegi, Tokyo, JP;

Yuji Araoka, Yokohama, JP;

Ken Ou, Yokohama, JP;

Assignees:

NIPPON STEEL CORPORATION, Tokyo, JP;

NHK SPRING CO., LTD., Yokohama, JP;

Attorney:

Greer Burns & Crain Ltd.

Primary Examiner:

Anthony M Liang

Assistant Examiner:

Danny N Kang

Int. Cl.
CPC ...
C21D 9/08 (2006.01); B23K 11/08 (2006.01); B23K 11/087 (2006.01); B23K 11/16 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/22 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); B23K 101/06 (2006.01); B23K 103/04 (2006.01);
U.S. Cl.
CPC ...
C21D 9/08 (2013.01); B23K 11/0873 (2013.01); B23K 11/16 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/22 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); B23K 2101/06 (2018.08); B23K 2103/04 (2018.08); C21D 2211/005 (2013.01); C21D 2211/009 (2013.01);
Abstract

This electric resistance-welded steel tube for a hollow stabilizer is an electric resistance-welded steel tube for a hollow stabilizer including a base material portion and a weld, in which the base material portion has predetermined chemical components, a wall thickness of the base material portion is 2.0 to 6.0 mm, an outer diameter of the electric resistance-welded steel tube is 10 to 40 mm, in a C direction cross section of the electric resistance-welded steel tube, a recessed bead cut is present in a region including the weld on an inner surface side of the electric resistance-welded steel tube, when an imaginary line is drawn from one opening edge to the other opening edge of the bead cut in a shortest distance, a maximum depth from the imaginary line to a bottom of the bead cut is 300 μm or less, a maximum inclusion diameter that is included in the base material portion is 300 μm or less, in the base material portion of the electric resistance-welded steel tube, a surface roughness of the inner surface side is 300 μm or less in terms of a maximum profile valley depth Rv, and maximum hardness of the electric resistance-welded steel tube including the weld is 300 Hv or less.

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