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Hot Stamped Object

Abstract: This hot-stamped object has a predetermined chemical composition, and when a region ranging, in the thickness direction from the surface, from a position corresponding to 1/8 the thickness to a position corresponding to 3/8 the thickness is defined as a 1/4 depth position, the microstructure at the 1/4 depth position comprises, in areal proportion, 80.0% or more of martensite and 0.0-5.0%, excluding 5.0%, of retained austenite. In the microstructure at the 1/4 depth position, the number density of iron-based carbide grains present in the martensite and have a circle-equivalent diameter exceeding 0.5 µm is less than 0.050 grains/µm2 and the average distance between any of the iron-based carbide grains and another iron-based carbide grain closest thereto is 3.0 µm or greater. In the microstructure at the 1/4 depth position, the prior austenite grain size is 20.0 µm or less.

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Patent Information

Application #
Filing Date
19 September 2025
Publication Number
48/2025
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. FUJINAKA Shingo
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
2. NISHIBATA Hitomi
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

Specification

Documents

Application Documents

# Name Date
1 202517089423-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [19-09-2025(online)].pdf 2025-09-19
2 202517089423-STATEMENT OF UNDERTAKING (FORM 3) [19-09-2025(online)].pdf 2025-09-19
3 202517089423-REQUEST FOR EXAMINATION (FORM-18) [19-09-2025(online)].pdf 2025-09-19
4 202517089423-PROOF OF RIGHT [19-09-2025(online)].pdf 2025-09-19
5 202517089423-PRIORITY DOCUMENTS [19-09-2025(online)].pdf 2025-09-19
6 202517089423-POWER OF AUTHORITY [19-09-2025(online)].pdf 2025-09-19
7 202517089423-FORM 18 [19-09-2025(online)].pdf 2025-09-19
8 202517089423-FORM 1 [19-09-2025(online)].pdf 2025-09-19
9 202517089423-DRAWINGS [19-09-2025(online)].pdf 2025-09-19
10 202517089423-DECLARATION OF INVENTORSHIP (FORM 5) [19-09-2025(online)].pdf 2025-09-19
11 202517089423-COMPLETE SPECIFICATION [19-09-2025(online)].pdf 2025-09-19