Steel Sheet And Plated Steel Sheet

Abstract: The present invention addresses the problem of providing a steel sheet and a plated steel sheet that have high LME resistance and hydrogen desorption. This steel sheet and plated steel sheet are characterized: by having prescribed chemical components; in that the depth in the depth direction from the surface of the steel sheets at which the C concentration as measured by GDS is no more than 0.05% is at least 10 µm; in that the thickness in the depth direction from the surface of the steel sheets of a layer that has a ferrite phase area fraction of at least 90% is at least 20 µm; and in that the Ra surface roughness of the steel sheets is no more than 3.0 µm.

Patent Information

Application #

Filing Date

27 February 2025

Publication Number

12/2025

Publication Type

INA

Invention Field

METALLURGY

Status

Email

Parent Application

Applicants

NIPPON STEEL CORPORATION

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

Inventors

1. MITSUNOBU, Takuya

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

2. YOKOYAMA, Takafumi

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

3. TAKEBAYASHI, Hiroshi

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

Specification

Documents

Application Documents

#	Name	Date
1	202517017363-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [27-02-2025(online)].pdf	2025-02-27
2	202517017363-STATEMENT OF UNDERTAKING (FORM 3) [27-02-2025(online)].pdf	2025-02-27
3	202517017363-REQUEST FOR EXAMINATION (FORM-18) [27-02-2025(online)].pdf	2025-02-27
4	202517017363-PROOF OF RIGHT [27-02-2025(online)].pdf	2025-02-27
5	202517017363-PRIORITY DOCUMENTS [27-02-2025(online)].pdf	2025-02-27
6	202517017363-POWER OF AUTHORITY [27-02-2025(online)].pdf	2025-02-27
7	202517017363-FORM 18 [27-02-2025(online)].pdf	2025-02-27
8	202517017363-FORM 1 [27-02-2025(online)].pdf	2025-02-27
9	202517017363-DRAWINGS [27-02-2025(online)].pdf	2025-02-27
10	202517017363-DECLARATION OF INVENTORSHIP (FORM 5) [27-02-2025(online)].pdf	2025-02-27
11	202517017363-COMPLETE SPECIFICATION [27-02-2025(online)].pdf	2025-02-27
12	202517017363-FORM 3 [04-07-2025(online)].pdf	2025-07-04