Frame Member

Abstract: This frame member is obtained by joining a first steel sheet member and a second steel sheet member by spot welding at a spot-welded part. The frame member has a cross-sectional region wherein a cross section perpendicular to the lengthwise direction of the frame member is a closed cross section. The first steel sheet member has a tensile strength of no less than 1900 MPa, and the spot-welded part has a molten metal portion formed by the spot welding, and a heat-affected portion adjacent to the outside of the molten metal portion. The average Vickers hardness HvAve at a measurement site corresponding to a first region on a hypothetical line and the minimum Vickers hardness HvMin at a measurement site corresponding to a third region on the hypothetical line satisfy the inequality HvAve-HvMin=100.

Patent Information

Application #

Filing Date

03 July 2023

Publication Number

34/2024

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. KATO Ryoma

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

2. AITOH Takahiro

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

3. FUJINAKA Shingo

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	202317044422-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [03-07-2023(online)].pdf	2023-07-03
2	202317044422-STATEMENT OF UNDERTAKING (FORM 3) [03-07-2023(online)].pdf	2023-07-03
3	202317044422-REQUEST FOR EXAMINATION (FORM-18) [03-07-2023(online)].pdf	2023-07-03
4	202317044422-PROOF OF RIGHT [03-07-2023(online)].pdf	2023-07-03
5	202317044422-PRIORITY DOCUMENTS [03-07-2023(online)].pdf	2023-07-03
6	202317044422-POWER OF AUTHORITY [03-07-2023(online)].pdf	2023-07-03
7	202317044422-NOTIFICATION OF INT. APPLN. NO. & FILING DATE (PCT-RO-105-PCT Pamphlet) [03-07-2023(online)].pdf	2023-07-03
8	202317044422-FORM 18 [03-07-2023(online)].pdf	2023-07-03
9	202317044422-FORM 1 [03-07-2023(online)].pdf	2023-07-03
10	202317044422-DRAWINGS [03-07-2023(online)].pdf	2023-07-03
11	202317044422-DECLARATION OF INVENTORSHIP (FORM 5) [03-07-2023(online)].pdf	2023-07-03
12	202317044422-COMPLETE SPECIFICATION [03-07-2023(online)].pdf	2023-07-03
13	202317044422-FORM 3 [15-11-2023(online)].pdf	2023-11-15