Hot Rolled Steel Sheet And Method For Manufacturing Same

Abstract: This hot-rolled steel sheet has a prescribed chemical composition, and the metallographic structure thereof includes, by area ratio, 53.0% to 76.0% of ferrite, 3.0% to 10.0% of martensite, 14.0% to 39.0% of bainite, and 2.6% or less of pearlite. The average diameter of the martensite is 0.26 µm to 0.70 µm. Of the entire martensite interface, the total length of the interface between the martensite and the bainite is 75.0% or more relative to the total length of the entire martensite interface.

Patent Information

Application #

Filing Date

19 September 2023

Publication Number

37/2024

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. KATOU Naoko

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

2. SAKURADA Eisaku

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

3. NIKAIDO Hitoshi

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

Specification

Documents

Application Documents

#	Name	Date
1	202317062834-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [19-09-2023(online)].pdf	2023-09-19
2	202317062834-STATEMENT OF UNDERTAKING (FORM 3) [19-09-2023(online)].pdf	2023-09-19
3	202317062834-PROOF OF RIGHT [19-09-2023(online)].pdf	2023-09-19
4	202317062834-POWER OF AUTHORITY [19-09-2023(online)].pdf	2023-09-19
5	202317062834-FORM 1 [19-09-2023(online)].pdf	2023-09-19
6	202317062834-DRAWINGS [19-09-2023(online)].pdf	2023-09-19
7	202317062834-DECLARATION OF INVENTORSHIP (FORM 5) [19-09-2023(online)].pdf	2023-09-19
8	202317062834-COMPLETE SPECIFICATION [19-09-2023(online)].pdf	2023-09-19
9	202317062834-FORM 3 [12-02-2024(online)].pdf	2024-02-12
10	202317062834-FORM 18 [22-05-2025(online)].pdf	2025-05-22