Method for producing a hot strip by means of strip casting with material properties adjustable across the strip cross-section

US10086426B2 · kind B2 · utility

Assignee

• Salzgitter Flachstahl GmbH · DE

Inventors

• Karl-Heinz Spitzer · Clausthal-Zellerfeld, DE
• Volker Flaxa · Salzgitter, DE
• Joachim Kroos · Meine, DE
• Hellfried Eichholz · Peine, DE
• Markus Schäperkötter · Braunschweig, DE
• Rune Schmidt-Jürgensen · Hannover, DE

Key dates

• Filing date: Jul 14, 2010
• Grant date: Oct 2, 2018
• Expiry date: Jul 14, 2030

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22D11/0631
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a method for producing a hot strip of steel with material properties that are adjustable over the strip cross-section, a steel melt is fed onto a revolving casting belt of a horizontal strip casting facility and solidifies to form a pre-strip having a thickness between 6 and 20 mm, and the pre-strip is subjected to a hot rolling process after complete solidification. A gas jet or plasma jet composed of metallic and/or non-metallic elements that affect the material properties of the hot strip influences the steel melt that is still liquid and/or just about to start to solidify. The concentration of the elements introduced into the melt by the gas jet or plasma jet and diffusing into the melt is adjusted across the strip thickness and strip width by changing the influencing kinetic energy of the gas jet or plasma jet, the partial gas pressure and/or the applied temperature.