Combined casting and rolling installation and method for operating the combined casting and rolling installation

A method for operating a combined casting and rolling installation for producing a hot-rolled product from a continuously cast hot billet, comprising:

• providing a the combined casting and rolling installation including:
• a rough-rolling mill train configured to roll a continuously cast hot billet to form a rough-rolled strip;
• a discharging device arranged downstream of the rough-rolling mill train with respect to a conveying direction of the rough-rolled strip of the rough-rolling mill train;
• a first transporting device;
• a quenching device;
• a severing device arranged between the rough-rolling mill train and the discharging device, the severing device being configured to cut up a first sub-portion of the rough-rolled strip into a rough-rolled strip piece;
• and
• a control device configured to assign a local casting rate of the continuously cast hot billet to a rough-rolled strip position of the rough-rolled strip, the control device configured to identify the first sub-portion of the rough-rolled strip based on the rough-rolled strip position and the local casting rate;
• wherein the discharging device is configured to discharge the rough-rolled strip piece,
• wherein the first transporting device connects the severing device to the quenching device and is configured to transport the rough-rolled strip piece to the quenching device;
• wherein the quenching device is configured to quench the rough-rolled strip piece;
• wherein the rough-rolled strip piece is transported from the quenching device to a rough-rolled strip piece storage unit;
• wherein the discharging device is configured to discharge the rough-rolled strip piece to the rough-rolled strip piece storage unit;
• and
• wherein the local casting rate assigned by the control device to identify the first sub-portion of the rough-rolled strip is below a predefined minimum casting rate, the predefined minimum casting rate being a minimum for rolling the rough-rolled strip in a finishing rolling mill train;
• the method further comprising:
• rolling the continuously cast hot billet in the rough-rolling mill train to form the rough-rolled strip;
• cutting, by the severing device, the first sub-portion of the rough-rolled strip into rolled the rough-rolled strip piece;
• discharging, by the discharging device, the rough-rolled strip piece;
• transporting, by the first transporting device, the rough-rolled strip piece from the severing device to the quenching device;
• and
• quenching, by the quenching device, the rough-rolled strip piece by a cooling liquid.