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Steel Sheet And Hot Stamp Molded Body

Abstract: Provided is a steel sheet characterized by having a prescribed chemical composition and in that the depth, in the sheet thickness direction from the surface thereof, where the area fraction of pearlite is 0-20% is 3-100 µm, and the area fraction of pearlite having a circle-equivalent diameter of 5 µm or more is 0-30% at the depth where the area fraction of pearlite is 0-20%. Further provided is a hot-stamp molded body characterized by having a prescribed chemical composition and in that the average C concentration from the surface thereof to 20 µm in the thickness direction is 0.20 mass% or less, and the area fraction of martensite is 90% or more.

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Patent Information

Application #
Filing Date
03 June 2025
Publication Number
26/2025
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. HAYASHIDA, Shota
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
2. MITSUNOBU, Takuya
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
3. TAKEBAYASHI, Hiroshi
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

Specification

Documents

Application Documents

# Name Date
1 202517053676-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [03-06-2025(online)].pdf 2025-06-03
2 202517053676-STATEMENT OF UNDERTAKING (FORM 3) [03-06-2025(online)].pdf 2025-06-03
3 202517053676-REQUEST FOR EXAMINATION (FORM-18) [03-06-2025(online)].pdf 2025-06-03
4 202517053676-PROOF OF RIGHT [03-06-2025(online)].pdf 2025-06-03
5 202517053676-PRIORITY DOCUMENTS [03-06-2025(online)].pdf 2025-06-03
6 202517053676-POWER OF AUTHORITY [03-06-2025(online)].pdf 2025-06-03
7 202517053676-FORM 18 [03-06-2025(online)].pdf 2025-06-03
8 202517053676-FORM 1 [03-06-2025(online)].pdf 2025-06-03
9 202517053676-DECLARATION OF INVENTORSHIP (FORM 5) [03-06-2025(online)].pdf 2025-06-03
10 202517053676-COMPLETE SPECIFICATION [03-06-2025(online)].pdf 2025-06-03
11 202517053676-FORM-26 [03-09-2025(online)].pdf 2025-09-03
12 202517053676-FORM 3 [29-09-2025(online)].pdf 2025-09-29