Title:
角形鋼管およびその製造方法ならびに建築構造物
Document Type and Number:
Japanese Patent JP7375946
Kind Code:
B2
Abstract:
The present invention provides: a square steel tube in which the ductility of the corners thereof is increased, and a method for manufacturing the same; and a building structure employing said square steel tube. A square steel tube 10 has formed therein multiple flat portions 11 and multiple corner portions 12 that are respectively arranged alternately in the peripheral direction of the tube. The flat portions have a yield strength of 325 MPa or more, a tensile strength of 440 MPa or more, and a yield ratio of 0.90 or less. The curvature radius of the exterior side of the corner portions 12 is more than 3.0 times but not more than 4.0 times the average wall thickness of the flat portions 11. The Charpy absorbed energy of the corner portions 12 and the flat portions 11 is at least 70 J at 0°C, and the average uniform elongation of the corner portions 12 is 5% or higher.
Inventors:
Masashi Matsumoto
岡▲崎▼ 俊郎
Shunichi Tanaka
Shinsuke Ide
岡▲崎▼ 俊郎
Shunichi Tanaka
Shinsuke Ide
Application Number:
JP2022545972A
Publication Date:
November 08, 2023
Filing Date:
June 14, 2022
Export Citation:
Assignee:
JFE Steel Corporation
International Classes:
B21C37/15; B21C37/08; B21D5/12; B23K13/00
Domestic Patent References:
| JP2016011439A | ||||
| JP2014224377A |
Foreign References:
| WO2021039484A1 | ||||
| WO2019176979A1 | ||||
| WO2020209060A1 |
Other References:
伊藤大樹ら,高性能500N/mm2級冷間プレス成形角形鋼管の構造性能 その1 機械的性質と溶接部性能,日本建築学会大会学術講演梗概集,日本,日本建築学会,2018年09月28日,(東北),pp.1177
Attorney, Agent or Firm:
Tetsuro Isomura
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori
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