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1. (WO2017170561) METAL TUBE AND STRUCTURAL MEMBER USING METAL TUBE

Pub. No.:    WO/2017/170561    International Application No.:    PCT/JP2017/012663
Publication Date: Fri Oct 06 01:59:59 CEST 2017 International Filing Date: Wed Mar 29 01:59:59 CEST 2017
IPC: B62D 21/08
B60J 5/00
F16F 7/12
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: HIROSE, Satoshi
広瀬 智史
Title: METAL TUBE AND STRUCTURAL MEMBER USING METAL TUBE
Abstract:
This metal tube (1) has a circular cross section having an outer diameter D, and the length thereof is 6D or more. The metal tube (1) comprises a high-strength portion (1A) and a low-strength portion (1B). The high-strength portion (1A) is disposed around the circumstance of the metal tube (1) in a range of (2/3)D-3D of the longitudinal dimension of the metal tube (1). The yield strength of the high-strength portion (1A) is 500 Mpa (tensile strength: 980 Mpa) or more. The low-strength portion (1B) is disposed around the circumstance of the metal tube (1) on both sides of the high-strength portion (1A) in the metal-tube longitudinal direction. The yield strength of the low-strength portion (1B) is 60% to 85% of the high-strength portion (1A).