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Title:
SQUARE STEEL TUBE, METHOD FOR MANUFACTURING SAME, AND BUILDING STRUCTURE
Document Type and Number:
WIPO Patent Application WO/2020/209060
Kind Code:
A1
Abstract:
A purpose of the present invention is to provide: a square steel tube wherein there is little effect upon the machining and hardening of corners and surface cracking is suppressed; a method for manufacturing the same; and a building structure that uses the square steel tube according to the present invention. The present invention pertains to a square steel tube comprising flat parts and corners, wherein: the flat parts have a yield strength of 385 MPa or greater, a tensile strength of 520 MPa or greater, and a yield ratio of 0.90 or less; the hardness of the corners is such that the inner surface side of the corners has greater Vickers hardness than the outer surface side of the corners, the Vickers hardness of the outer surface side of the corners is 280 HV or less, and the difference between the Vickers hardness of the outer surface side of the corners and the Vickers hardness of the inner surface side of the corners is 80 HV or less; and and the Charpy absorption energy vE0 of the outer surface side of the corners at 0°C is 70 J or greater.

Inventors:
MATSUMOTO ATSUSHI (JP)
MATSUMOTO AKIHIDE (JP)
IDE SHINSUKE (JP)
OKABE TAKATOSHI (JP)
Application Number:
PCT/JP2020/013236
Publication Date:
October 15, 2020
Filing Date:
March 25, 2020
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
B21D5/12; C22C38/00; C22C38/60; E04B1/24; C21D8/02
Domestic Patent References:
WO2020039980A12020-02-27
Foreign References:
JP2018053281A2018-04-05
JP2017078196A2017-04-27
JP2016011439A2016-01-21
JP2011094214A2011-05-12
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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