Hot dip coated steel strip having an improved surface appearance and method for production thereof

US11655531B2 · kind B2 · utility

Assignee

• ThyssenKrupp Steel Europe AG · DE

Inventors

• Robert Yanik · Paderborn, DE
• Friedhelm Macherey · Alpen, DE
• Bastian Schöntaube · Willich, DE
• Frank Vennemann · Dinslaken, DE
• Jennifer Schulz · Unna, DE
• Folkert Schulze-Kraasch · Duisburg, DE

Key dates

• Filing date: Sep 14, 2018
• Grant date: May 23, 2023
• Expiry date: Sep 14, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C2/40
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The present invention relates to a method of hot dip coating of flat steel products, comprising a step of stripping the coated steel strip by means of at least one nozzle that emits a stripping gas having a temperature T3 at an angle α in the direction of the coated steel strip, wherein the angle α, the distance h between the surface of the melt bath and the lower edge of the nozzle in mm, the temperature of the stripping gas in ° C. and the differential between the temperature T2 of the melt bath and the temperature T1 of the steel strip are in a particular relationship to one another, and to a correspondingly produced hot dip-coated flat steel product.