Framework Member

Abstract: This framework member is formed by cold press-forming a steel plate. The framework member has a closed cross-sectional portion having a closed cross section perpendicular to the lengthwise direction, and the closed cross-sectional portion has at least one flat part having the radius of curvature larger than the maximum external dimension in the cross section. The Vickers hardness of a plate thickness center portion in a reference flat part is 300 Hv or greater, the width of the reference flat part is 2.0 times or less of the effective width, and the standard deviation ratio, which is obtained by dividing the standard deviation of a hardness frequency distribution at a surface layer portion of the reference flat part by the standard deviation of a hardness frequency distribution in the plate thickness center portion of the reference flat part, is greater than 1.0.

Patent Information

Application #

Filing Date

05 October 2023

Publication Number

36/2024

Publication Type

INA

Invention Field

MECHANICAL ENGINEERING

Status

Email

Parent Application

Applicants

NIPPON STEEL CORPORATION

6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

Inventors

1. AITOH Takahiro

c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

2. TAKEDA Kengo

c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

3. NAKANO Katsuya

c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

4. TODA Yuri

c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

Specification

Documents

Application Documents

#	Name	Date
1	202317066791-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [05-10-2023(online)].pdf	2023-10-05
2	202317066791-STATEMENT OF UNDERTAKING (FORM 3) [05-10-2023(online)].pdf	2023-10-05
3	202317066791-PROOF OF RIGHT [05-10-2023(online)].pdf	2023-10-05
4	202317066791-PRIORITY DOCUMENTS [05-10-2023(online)].pdf	2023-10-05
5	202317066791-POWER OF AUTHORITY [05-10-2023(online)].pdf	2023-10-05
6	202317066791-FORM 1 [05-10-2023(online)].pdf	2023-10-05
7	202317066791-DRAWINGS [05-10-2023(online)].pdf	2023-10-05
8	202317066791-DECLARATION OF INVENTORSHIP (FORM 5) [05-10-2023(online)].pdf	2023-10-05
9	202317066791-COMPLETE SPECIFICATION [05-10-2023(online)].pdf	2023-10-05
10	202317066791-FORM 3 [07-03-2024(online)].pdf	2024-03-07
11	202317066791-FORM 18 [11-04-2025(online)].pdf	2025-04-11