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Hot Rolled Steel Sheet

Abstract: Provided is a hot rolled steel sheet which: has a predetermined chemical composition; contains 80 98% of at least one of ferrite and bainite in total and 2 10% of martensite in terms of areal percentage; has a metallic structure in which when a boundary having an azimuth difference of 15?? or more is defined as a grain boundary and a region surrounded by the grain boundary and has a circle equivalent diameter of 0.3 ??m or more is defined as a crystal grain the proportion of the crystal grain having an in grain azimuth difference of 5 14?? is 10 60% in terms of areal percentage; and has a surface roughness Ra of less than 1.50 ??m wherein a difference between the maximum value and the minimum value of the surface roughness Ra is 0.50 ??m or less.

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Patent Information

Application #
Filing Date
12 May 2025
Publication Number
24/2025
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. YOSHITAKE Mutsumi
c/o NIPPON STEEL CORPORATION 6 1 Marunouchi 2 chome Chiyoda ku Tokyo 1008071
2. SHUTO Hiroshi
c/o NIPPON STEEL CORPORATION 6 1 Marunouchi 2 chome Chiyoda ku Tokyo 1008071
3. ANDO Jun
c/o NIPPON STEEL CORPORATION 6 1 Marunouchi 2 chome Chiyoda ku Tokyo 1008071

Specification

Documents

Application Documents

# Name Date
1 202517045546-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [12-05-2025(online)].pdf 2025-05-12
2 202517045546-STATEMENT OF UNDERTAKING (FORM 3) [12-05-2025(online)].pdf 2025-05-12
3 202517045546-REQUEST FOR EXAMINATION (FORM-18) [12-05-2025(online)].pdf 2025-05-12
4 202517045546-PROOF OF RIGHT [12-05-2025(online)].pdf 2025-05-12
5 202517045546-PRIORITY DOCUMENTS [12-05-2025(online)].pdf 2025-05-12
6 202517045546-POWER OF AUTHORITY [12-05-2025(online)].pdf 2025-05-12
7 202517045546-NOTIFICATION OF INT. APPLN. NO. & FILING DATE (PCT-RO-105-PCT Pamphlet) [12-05-2025(online)].pdf 2025-05-12
8 202517045546-FORM 18 [12-05-2025(online)].pdf 2025-05-12
9 202517045546-FORM 1 [12-05-2025(online)].pdf 2025-05-12
10 202517045546-DRAWINGS [12-05-2025(online)].pdf 2025-05-12
11 202517045546-DECLARATION OF INVENTORSHIP (FORM 5) [12-05-2025(online)].pdf 2025-05-12
12 202517045546-COMPLETE SPECIFICATION [12-05-2025(online)].pdf 2025-05-12
13 202517045546-MARKED COPIES OF AMENDEMENTS [16-05-2025(online)].pdf 2025-05-16
14 202517045546-FORM 13 [16-05-2025(online)].pdf 2025-05-16
15 202517045546-AMMENDED DOCUMENTS [16-05-2025(online)].pdf 2025-05-16
16 202517045546-FORM 3 [11-09-2025(online)].pdf 2025-09-11