Method for producing a hot strip

US6835253B1 · kind B1 · utility

Assignee

• THYSSEN KRUPP STAHL AG · DE

Inventors

• Rudlof Kawalla · Niederbobritzsch, DE
• Bernhard Engl · Dortmund, DE
• Thomas Heller · Pittsburgh, US
• Wolfgang Rasim · Wesel, DE
• Eberhard Sowka · Dinslaken, DE

Key dates

• Filing date: Jul 22, 2002
• Grant date: Dec 28, 2004
• Expiry date: Jul 22, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21D8/0436
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The invention relates to a method for producing a hot strip, in particular for producing a hot strip intended for the production of a cold strip with good deep-drawing characteristics; in which a steel melt comprising (in % by weight) C:≦0.07%, Si:≦0.5%, Mn:≦2.5%, Al:≦0.1%, N:≦0.01%, P:≦0.025, B:≦0.05, if need be up to a total of 0.35% of Nb, Ti and V, with the remainder being iron and the usual impurities is melted; in which the steel melt is continually output in one strand (S) from a permanent casting mould (1); in which the cast strand (S) immediately after discharge from the permanent casting mould (1) is led along a cooling line (2); in which the strand (S) is intensively cooled down to a temperature of Ar1±25 K at a cooling rate (aLM) of at least 3 K/s; in which, following its intensive cooling, the strand (S) is cooled by exposure to air for at least 30 seconds; and in which the strand (S) itself or thin slabs (D) divided off the strand (S) is/are reheated in a soaking furnace (5) before the strand (S) or the thin slabs (D) are hot rolled to form hot strip. The method according to the invention makes it possible, during processing of low-alloyed …