Thyssen Stahl Ag

Sms Schloemann-Siemag Aktiengesellschaft

Gunter Pietzko

Erich Hoffken

Hermann Lax

Dieter Kruger

Waldemar Wolpert

Jurgen Scharlack

Manfred Mohlenkamp

Friedrich Heymann

Heinz Matten

Gisbert Mehring

Hot-rolling process and hot-rolling mill for metal strip

A process for continuous casting of a metal comprises continuously withdrawing a strand of the metal from a mold along a strand withdrawal direction, measuring the expansion of an inside wall of the mold along the strand withdrawal direction to obtain a component of inside wall expansion in the strand withdrawal direction due to mechanical forces exerted on the inside wall, and controlling the speed of withdrawal based on the component of inside wall expansion in the strand withdrawal direction due to mechanical forces. If the component of inside wall expansion of in the strand withdrawal direction due to mechanical forces exceeds certain limit values, the withdrawal step is slowed or interrupted, thereby eliminating break-outs due to cobbles. In an embodiment of the invention, expansion measurements are also taken along a direction transverse to the withdrawal direction, enabling the elimination of the component of expansion in the withdrawal direction due to heat.

Process for the casting of metals in a continuous casting installation

A method for producing a steel strip which has been cast as a stand in a cooled oscillating continuous chill mould, comprises squeezing the strand emerging from the chill mould until it has a first cross-sectional thickness (40-50 mm), followed by hot rolling the strand until it has a second cross-sectional thickness (2-25 mm). Deviations in the normal path of travel of the strand following hot rolling are corrected by adjusting the thickness to which the strand is subjected during the first squeezing step.

Method for the production of a steel strip by the casting of a strand

The continuous casting installation includes:

Installation for the production of a steel strip

A steel strand having a thickness of 40 to 50 mm in cast in an oscillating mold for continuous casting at a speed of 2 to 20 m/min. The not yet completely solidified steel strand emerging from the mold is squeezed to such an extent that the inner walls of the already solidified strand shell are welded to one another. After the steel strand reduced in thickness in this way has been cooled to 1000.degree. to 1200.degree. C., the strip is rolled out in at least one pass with a 5 to 85% degree of deformation.

Process for the production of a steel strip

Growing community of inventors

Essen, Germany

Gunter Pietzko