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Precoated Steel Sheet

Abstract: A precoated steel sheet according to the present invention addresses the problem of achieving more excellent scratch resistance and more excellent coating film adhesion even in cases where a coating film has a large film thickness. This precoated steel sheet comprises a Zn-containing plating layer, a chemical conversion coating layer containing at least zirconium, and a coating layer; the coating layer contains at least a binder resin and resin particles; the average thickness of the coating film is 3 µm to 10 µm; the intensity of zirconium at the Zn-containing plating layer-side interface of the coating layer is 1.05 to 3.00 times the average intensity of zirconium in the range of 1 µm to 2 µm from the surface of the coating film as calculated based on the depth profile of the zirconium distribution of the coating film as determined by glow discharge optical emission spectrometry; and if a cross-section of the coating film in the thickness direction is examined, the average area ratio of the resin particles in a region having a length of 60 µm in a direction that is perpendicular to the thickness direction is 5% to 30%.

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Notices, Deadlines & Correspondence

Patent Information

Application #
Filing Date
26 March 2025
Publication Number
16/2025
Publication Type
INA
Invention Field
CHEMICAL
Status
Email
Parent Application

Applicants

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

Inventors

1. FUJII, Takashi
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
2. KAWAMURA, Yasuaki
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
3. HIRAI, Akiko
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
4. TOSHIN, Kunihiko
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
5. FUJITA, Kohei
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
6. KUROKAWA, Fumiya
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071
7. NAKAGAWA, Jun
c/o NIPPON STEEL CORPORATION, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 1008071

Specification

Documents

Application Documents

# Name Date
1 202517028379-TRANSLATIOIN OF PRIOIRTY DOCUMENTS ETC. [26-03-2025(online)].pdf 2025-03-26
2 202517028379-STATEMENT OF UNDERTAKING (FORM 3) [26-03-2025(online)].pdf 2025-03-26
3 202517028379-REQUEST FOR EXAMINATION (FORM-18) [26-03-2025(online)].pdf 2025-03-26
4 202517028379-PRIORITY DOCUMENTS [26-03-2025(online)].pdf 2025-03-26
5 202517028379-POWER OF AUTHORITY [26-03-2025(online)].pdf 2025-03-26
6 202517028379-FORM 18 [26-03-2025(online)].pdf 2025-03-26
7 202517028379-FORM 1 [26-03-2025(online)].pdf 2025-03-26
8 202517028379-DRAWINGS [26-03-2025(online)].pdf 2025-03-26
9 202517028379-DECLARATION OF INVENTORSHIP (FORM 5) [26-03-2025(online)].pdf 2025-03-26
10 202517028379-COMPLETE SPECIFICATION [26-03-2025(online)].pdf 2025-03-26
11 202517028379-Proof of Right [24-04-2025(online)].pdf 2025-04-24
12 202517028379-FORM 3 [30-07-2025(online)].pdf 2025-07-30