Steel Sheet And Plated Steel Sheet

Abstract: The present invention addresses the problem of providing a steel sheet and a plated steel sheet each having high LME resistance. Each of the steel sheet and the plated steel sheet according to the present invention is characterized by having specified chemical components, and is also characterized in that the depth at which the C concentration measured by GDS is 0.01% or less is 3 µm or more when observed in the depth direction from the surface of the steel sheet, the thickness of a layer in which the area ratio of cementite is 10% or less is 5 µm or more when observed in the depth direction from the surface of the steel sheet, and the steel sheet has such surface roughness that the arithmetic average roughness Ra is 3.0 µm or less.

Patent Information

Application #

Filing Date

18 June 2025

Publication Number

30/2025

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. FURUKAWA, Noriyuki

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

3. OKE, Takashi

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

4. TAKEBAYASHI, Hiroshi

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

Specification

Documents

Application Documents

#	Name	Date
1	202517058549-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [18-06-2025(online)].pdf	2025-06-18
2	202517058549-STATEMENT OF UNDERTAKING (FORM 3) [18-06-2025(online)].pdf	2025-06-18
3	202517058549-REQUEST FOR EXAMINATION (FORM-18) [18-06-2025(online)].pdf	2025-06-18
4	202517058549-PROOF OF RIGHT [18-06-2025(online)].pdf	2025-06-18
5	202517058549-PRIORITY DOCUMENTS [18-06-2025(online)].pdf	2025-06-18
6	202517058549-POWER OF AUTHORITY [18-06-2025(online)].pdf	2025-06-18
7	202517058549-NOTIFICATION OF INT. APPLN. NO. & FILING DATE (PCT-RO-105-PCT Pamphlet) [18-06-2025(online)].pdf	2025-06-18
8	202517058549-FORM 18 [18-06-2025(online)].pdf	2025-06-18
9	202517058549-FORM 1 [18-06-2025(online)].pdf	2025-06-18
10	202517058549-DRAWINGS [18-06-2025(online)].pdf	2025-06-18
11	202517058549-DECLARATION OF INVENTORSHIP (FORM 5) [18-06-2025(online)].pdf	2025-06-18
12	202517058549-COMPLETE SPECIFICATION [18-06-2025(online)].pdf	2025-06-18
13	202517058549-FORM 3 [24-10-2025(online)].pdf	2025-10-24