公开(公告)号：US10662516B2

公开(公告)日：2020-05-26

申请号：US15553658

申请日：2016-03-02

Applicant: JFE STEEL CORPORATION

Inventor： Toshihiko Ooi ,  Yohei Sato ,  Yoichi Tobiyama ,  Toshiyuki Okuma ,  Akihiko Furuta ,  Masahiro Yoshida ,  Yoshitsugu Suzuki ,  Satoru Ando ,  Akira Matsuzaki

IPC: C23C2/06 ,  C22C18/04 ,  C23C2/28 ,  C22C30/06 ,  C23C2/12 ,  C22C21/10

Abstract: Provided is a hot-dip Al—Zn—Mg—Si coated steel sheet having good corrosion resistance in flat parts and edge parts, and also having excellent worked part corrosion resistance. The hot-dip Al—Zn—Mg—Si coated steel sheet includes a base steel sheet and a hot-dip coating on a surface of the base steel sheet. The hot-dip coating includes an interfacial alloy layer present at an interface with the base steel sheet and a main layer present on the interfacial alloy layer, and contains from 25 mass % to 80 mass % of Al, from greater than 0.6 mass % to 15 mass % of Si, and from greater than 0.1 mass % to 25 mass % of Mg. The Mg content and Si content in the hot-dip coating satisfy formula (1): MMg/(MSi−0.6)>1.7  (1) where MMg represents the Mg content (mass %) and MSi represents the Si content (mass %).