Method for producing a hot-rolled steel strip and combined casting and rolling installation for carrying out the method

Abstract

A method for producing a hot-rolled steel strip from a steel melt in a continuous production process, with the strip running through uninterruptedly, comprises the following method steps: continuous casting of a steel strand (5) in a continuous casting mould (2) of a continuous casting installation (1), roll forming of the cast steel strand in a first group of roll stands (6) to form a pre-rolled hot strip (7), further roll forming of the pre-rolled hot strip in a second group of roll stands (19) to form a hot-rolled steel strip (21), setting the pre-rolled hot strip to rolling temperature between the first group of roll stands and the second group of roll stands in a temperature setting device (14), and winding up the hot-rolled steel strip into coils or dividing up the hot-rolled steel strip into panels. In order to increase flexibility in the production of different grades of steel and keep investment costs and operating costs low, it is proposed that the pre-rolled hot strip is descaled immediately before entering the temperature setting device, the pre-rolled hot strip is kept in a protective gas atmosphere in the temperature setting device and the pre-rolled hot strip is roll-formed in the second group of roll stands immediately after running through the temperature setting device. Furthermore, a combined casting and rolling installation for carrying out the method is proposed.

Description

technical field [0001] The invention relates to a method for producing a hot-rolled steel strip in coils or sheets, which is produced from a steel melt in a continuous production process without interruption through a combined casting and rolling plant Manufacture; the invention also relates to a co-cast-rolling plant for carrying out the method. [0002] This method comprises the method step of forming a continuously cast steel product from liquid steel by continuous casting in a continuous casting mold of a continuous casting plant. In a subsequent first set of rolling stands, the cast continuously cast steel is rolled into pre-rolled hot strip, and in a second set of rolling stands, the pre-rolled hot strip is The desired final dimensions and desired material properties are finally rolled into hot-rolled steel strip. Between said first group of rolling stands and said second group of rolling stands, the pre-rolled hot strip is adjusted to a rolling temperature in a temper...

AI Technical Summary

Problems solved by technology

In the case of single-strand casting installations, this separation can be carried out in the same way and thus leads to the described disadvantages

Images