GALVANIZED STEEL SHEET

Provided is a galvanized steel sheet having excellent press formability and good after-painting surface appearance with which it is possible to appropriately inhibit die galling, which causes cracking occurring in a formed product when press forming is performed, without forming a lubrication film s...

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Bibliographische Detailangaben
Hauptverfasser: HOSHINO, Katsuya, MATSUDA, Takeshi, BABA, Wataru, TSUCHIMOTO, Kazuaki, ASAKAWA, Taiyo, WATANABE, Kento, MAKIMIZU, Yoichi
Format: Patent
Sprache:eng ; fre ; ger
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Beschreibung
Zusammenfassung:Provided is a galvanized steel sheet having excellent press formability and good after-painting surface appearance with which it is possible to appropriately inhibit die galling, which causes cracking occurring in a formed product when press forming is performed, without forming a lubrication film such as a zinc phosphate-based film or the like on the surface thereof.A galvanized steel sheet, in which an arithmetic average roughness Ra of a surface of the steel sheet is 0.5 um to 2.5 um, in which the steel sheet has concave and convex portions on the surface thereof, in which there are flattened portions in the convex portions, in which the number of valleys between the convex portions having a valley width of 0.1 mm or more and a maximum depth of 2.0 um or more is 50 or more and less than 100 per 25 mm on a straight line, and in which, in the flattened portions in the convex portions, the number of concave and convex portions having a height difference of 0.3 um or more is less than 20 per 2.5 mm on a straight line.