Steel Sheet And Method Of Production Of Same

Abstract: Provided are a steel sheet and a method for manufacturing same. The steel sheet has a predetermined chemical composition and has a metallic microstructure containing, in area%, 60.0-85.0% of martensite, 10.0-30.0% of granular bainite, in which the maximum misorientation is 3.5° or less at 0.1 µm intervals and the in-grain misorientation is at least 10° within a grain surrounded by grain boundaries having a misorientation of at least 15°, and 20.0% or less of ferrite, wherein the average spacing between grains of the granular bainite is 50.0 µm or less.

Patent Information

Application #

Filing Date

11 August 2025

Publication Number

38/2025

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. MURATA, Shinichi

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

2. YASUTOMI, Takashi

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

3. SAKURADA, Eisaku

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

Specification

Documents

Application Documents

#	Name	Date
1	202517076302-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [11-08-2025(online)].pdf	2025-08-11
2	202517076302-STATEMENT OF UNDERTAKING (FORM 3) [11-08-2025(online)].pdf	2025-08-11
3	202517076302-REQUEST FOR EXAMINATION (FORM-18) [11-08-2025(online)].pdf	2025-08-11
4	202517076302-PROOF OF RIGHT [11-08-2025(online)].pdf	2025-08-11
5	202517076302-PRIORITY DOCUMENTS [11-08-2025(online)].pdf	2025-08-11
6	202517076302-POWER OF AUTHORITY [11-08-2025(online)].pdf	2025-08-11
7	202517076302-FORM 18 [11-08-2025(online)].pdf	2025-08-11
8	202517076302-FORM 1 [11-08-2025(online)].pdf	2025-08-11
9	202517076302-DECLARATION OF INVENTORSHIP (FORM 5) [11-08-2025(online)].pdf	2025-08-11
10	202517076302-COMPLETE SPECIFICATION [11-08-2025(online)].pdf	2025-08-11