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Hot Stamp Molded Body

Abstract: This hot-stamp molded body includes: a first region having a metal structure in which the martensite area ratio is 95% or more and the average aspect ratio of prior-austenite grains is 1.10 or less; and a second region having a metal structure in which the martensite area ratio is 95% or more and the average aspect ratio of prior-austenite grains is 2.00 or more. The average crystalline grain diameter G1 (µm) of the prior-austenite grains in the first region and the average crystalline grain diameter G2 (µm) of the prior-austenite grains in the second region satisfy [G1=15.0], [G2=25.0], and [G2-G1=3.0]. The tensile strength measured by a tensile test using a test piece taken from the first region is 1250-2540 MPa.

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Patent Information

Application #
Filing Date
09 September 2025
Publication Number
39/2025
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. MORI, Keitaro
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
3. SUZUKI, Toshiya
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

Specification

Documents

Application Documents

# Name Date
1 202517085401-STATEMENT OF UNDERTAKING (FORM 3) [09-09-2025(online)].pdf 2025-09-09
2 202517085401-REQUEST FOR EXAMINATION (FORM-18) [09-09-2025(online)].pdf 2025-09-09
3 202517085401-PROOF OF RIGHT [09-09-2025(online)].pdf 2025-09-09
4 202517085401-POWER OF AUTHORITY [09-09-2025(online)].pdf 2025-09-09
5 202517085401-FORM 18 [09-09-2025(online)].pdf 2025-09-09
6 202517085401-FORM 1 [09-09-2025(online)].pdf 2025-09-09
7 202517085401-FIGURE OF ABSTRACT [09-09-2025(online)].pdf 2025-09-09
8 202517085401-DRAWINGS [09-09-2025(online)].pdf 2025-09-09
9 202517085401-DECLARATION OF INVENTORSHIP (FORM 5) [09-09-2025(online)].pdf 2025-09-09
10 202517085401-COMPLETE SPECIFICATION [09-09-2025(online)].pdf 2025-09-09