Invention Application
- Patent Title: ELECTRIC RESISTANCE-WELDED STEEL TUBE FOR HOLLOW STABILIZER, HOLLOW STABILIZER, AND MANUFACTURING METHODS OF SAME
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Application No.: US17593103Application Date: 2020-03-27
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Publication No.: US20220186331A1Publication Date: 2022-06-16
- Inventor: Yukinobu NAGATA , Yuki MOTEGI , Yuji ARAOKA , Ken OU
- Applicant: NIPPON STEEL CORPORATION , NHK SPRING CO., LTD.
- Applicant Address: JP Tokyo; JP Yokohama-shi, Kanagawa
- Assignee: NIPPON STEEL CORPORATION,NHK SPRING CO., LTD.
- Current Assignee: NIPPON STEEL CORPORATION,NHK SPRING CO., LTD.
- Current Assignee Address: JP Tokyo; JP Yokohama-shi, Kanagawa
- Priority: JP2019-069150 20190329,JP2020-019189 20200206
- International Application: PCT/JP2020/014287 WO 20200327
- Main IPC: C21D9/08
- IPC: C21D9/08 ; B23K11/087 ; B23K11/16 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/22 ; C22C38/32 ; C22C38/28

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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