Method for steel strip coating and a steel strip provided with said coating

US7892654B2 · kind B2 · utility

Assignee

• Thyssenkrupp Steel AG · DE

Inventors

• Harald Hofmann · Bergneustadt, DE
• Manfred Meurer · Rheinberg, DE
• Bernd Schuhmacher · Dortmund, DE
• Slavcho Topalski · Dortmund, DE

Key dates

• Filing date: Feb 1, 2006
• Grant date: Feb 22, 2011
• Expiry date: Mar 24, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/12799
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Coating steel strips comprising, in % by weight, C: ≦1.6%, Mn: 6-30%, Al: ≦10%, Ni: ≦10%, Cr: ≦10%, Si: ≦8%, Cu: ≦3%, Nb: ≦0.6%, Ti: ≦0.3%, V: ≦0.3%, P: ≦0.1%, B: ≦0.01%, the rest being iron and unavoidable impurities, and a method of forming steel strips are described. Up to now, such steel strips were not adequately coatable, with a metal coating ensuring outstanding corrosion-resistance and good welding properties. This is ensured by applying an aluminium layer to the steel strip before final annealing and applying the metal coating to said aluminium layer after final annealing.