Process and device for producing a steel strip with the properties of a cold-rolled product

US5832985A · kind A · utility

Assignee

• Mannesmann AG · DE

Inventors

• Fritz-Peter Pleschiutschnigg · Düsseldorf, DE
• Ingo von Hagen · Krefeld, DE
• Wolfgang Bleck · Aachen, DE
• Paul Splinter · Aachen, DE

Key dates

• Filing date: Apr 21, 1997
• Grant date: Nov 10, 1998
• Expiry date: Apr 21, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49991
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A process for producing a steel strip with properties of a cold-rolled product. The process including comprising the sequential steps of: a) producing a thin slab 30 to 100 mm thick from a steel melt by continuous casting in a continuous casting machine, and, after a cast strip emerges from a mold of the continuous casting machine, cast rolling the cast strip with a liquid core to reduce thickness of the cast strip by at least 10%; b) descaling the thin slab produced according to step a); c) hot rolling the descaled thin slab at temperatures in a range of 1150.degree. to 900.degree. C. for reducing thickness by at least 50% to produce an intermediate strip with a maximum thickness of 20 mm; d) after hot rolling, accelerated cooling of the intermediate strip to a temperature in a range of 850.degree. to 600.degree. C.; e) rolling down the cooled intermediate strip by isothermic rolling at 850.degree. to 600.degree. C. on a finishing train with at least three stands into strips with a maximum thickness of 2 mm, whereby the strip thickness is reduced by at least 25% per roll pass; and f) subsequently cooling the isothermic rolled steel strip in accelerated fashion to a temperature no …