发明名称 |
elemento oco |
摘要 |
A lightweight hollow member having excellent stiffness and impact properties and which is suitable for automotive parts due to having a high strength such as at least 780 MPa and a complicated shape is provided. A hollow member 11 has a hollow steel body 14. The body 14 is constituted by a single member at least in the lengthwise direction. The body 14 has a non-equidimensional cross section having at least a portion with a maximum outer dimension L 1 and a portion with an outer dimension L 2 shorter than the maximum outer dimension L 1 . The body 14 has a twisted portion in a portion of its length. The angle of intersection between an imaginary plane 15a including the portion having the maximum outer dimension L 1 in a first portion 15 present on one side of the body 14 in the lengthwise direction with the twisted portion 17 as a border and an imaginary plane 16a including the portion with the maximum outer dimension L 1 in a second portion 16 present on the other side in the lengthwise direction of the body 14 with the twisted portion 17 as a border is at least 4 degrees. The twisted portion 17 has a tensile strength of at least 780 MPa. |
申请公布号 |
BRPI1007219(A2) |
申请公布日期 |
2016.02.23 |
申请号 |
BR2010PI07219 |
申请日期 |
2010.01.21 |
申请人 |
NIPPON STEEL & SUMITO METAL CORPORATION |
发明人 |
ATSUSHI TOMIZAWA;MICHITAKA YOSHIDA;NAOAKI SHIMADA |
分类号 |
B21D11/14;B21D47/01;B21D51/16 |
主分类号 |
B21D11/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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