Plattiertes Stahlblech auf Zn-Al-Mg-Basis

Details

Veröffentlichungs-Nr.

EP4793397

Anmeldetag

18. Dezember 2024

Veröffentlichung

14. August 2025

Rechtsraum

EP

Abstract

Provided is a Zn-Al-Mg coated steel sheet that exhibits excellent blistering corrosion resistance and appearance-related corrosion resistance in painted cut portions, as well as excellent lapped flat-sheet portion corrosion resistance, even in corrosion environments where temperatures fluctuate greatly from freezing and below to high temperatures. The Zn-Al-Mg coated steel sheet includes a base steel sheet and a coated layer formed on at least one side of the base steel sheet. The coated layer has a defined chemical composition. In a reflected electron image obtained by irradiating a surface of the coated layer with an electron beam using a scanning electron microscope, (I) single-phase Zn microstructures exist as islands within a matrix of Zn-Al-MgZn<2> ternary eutectic alloy microstructure, (II) a circle equivalent average radius r<ave> of the single-phase Zn microstructures is 6.0 µm or more and 14.0 µm or less, and (III) an average width d<ave> of the Zn-Al-MgZn<2> ternary eutectic alloy microstructure located between adjacent single-phase Zn microstructures is 4.0 µm or more and 6.0 µm or less.

Anmelder

Firma

JFE Steel Corporation

Land

🇯🇵 Japan