Corus Technology B.v.

Corus Staal

Aldricus Maria Groot

Huibert W Den Hartog

Marcus Cornelis Maria Cornelissen

Process for producing a steel strip or sheet, in which liquid steel is cast in a continuous-casting machine to form a thin plate and, while making use of the casting heat, is fed through a furnace device, is roughed in a roughing stand to a pass-over thickness and is rerolled in a finishing rolling stand to form a steel strip or sheet of the desired final thickness, in which (a) to produce a ferritically rolled steel strip, the strip, the plate or a part thereof is fed without interruption at least from the furnace device, at speeds which essentially correspond to the speed of entry into the roughing stand and the following reductions in thickness, from the roughing stand to a processing device which is disposed downstream of the finishing rolling stand, the strip coming out of the roughing stand being cooled to a temperature at which the steel has an essentially ferritic structure; (b) to produce an austenitically rolled steel strip, the strip coming out of the roughing roll is brought to or held at a temperature in the austenitic range, and in the finishing rolling stand it is rolled to the final thickness essentially in the austenitic field and is then cooled, after this rolling, to the ferritic field.

Process and device for producing a steel strip or sheet

Method for the manufacture of a steel strip, wherein molten steel is cast into a slab, conveyed through a furnace, roughed in a roughing apparatus and finish-rolled in a finishing apparatus. The method comprises an endless or semi-endless process having either step a or step b, wherein a and b respectively comprise (a) manufacturing a ferritically rolled steel strip, wherein the slab is rolled in the roughing apparatus in the austenitic range and then cooled to a ferritic structure, and wherein the strip is rolled in the finishing apparatus at speeds essentially corresponding to the entry speed into the finishing apparatus, and (b) manufacturing an austenitically rolled steel strip, wherein the strip leaving the roughing apparatus is heated to the austenitic range and is rolled in the finishing apparatus and then cooled down to the ferritic range. In both step a and b, there is no material connection between the steel in the continuous casting machine and the steel being rolled in the finishing apparatus, and the strip is fed from the roughing apparatus to the finishing apparatus without intermediate storage. Additional steps include cutting the ferritically or austenitically rolled strip, after reaching the desired finished thickness, to portions of the desired length, and coiling the cut portions.

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Heerhugowaard, Netherlands

Aldricus Maria Groot