Method for producing a microalloyed steel, a microalloyed steel produced using the method, and a combined casting/rolling installation

A process for producing a microalloyed steel in an integrated casting-rolling plant having a continuous casting machine having a mold, a single- or multi-stand prerolling train, a finish-rolling train having a first stand group with at least one first finish-rolling stand and a second stand group having at least one stand cooler, the process comprising:

• casting a metallic melt in the mold to give a partly solidified thin-slab strand,
• supporting, deflecting, and cooling the partly solidified thin-slab strand to give a fully solidified thin-slab strand,
• rolling the fully solidified thin-slab strand with the prerolling train to give a prerolled strip,
• finish-rolling the prerolled strip with the first stand group of the finish-rolling train to give a finish-rolled strip,
• feeding, immediately after the finish rolling, the finish-rolled strip to the second stand group, and
• force-cooling the finish-rolled strip in the second stand group with retention of a thickness of the finish-rolled strip in such a way that a cooling rate of a core of the finish-rolled strip in the second stand group is greater than 20° C./s and less than 200° C./s, and
• transporting the finish-rolled strip through a cooling zone downstream of the finish-rolling train based on a conveying direction of the finish-rolled strip to a winding device downstream of the cooling zone while further cooling the finish-rolled strip,
• wherein the finish-rolled strip is transported with a first exit temperature (TA1) at its core into the second stand group of the finish-rolling train,
• wherein, upon exiting of the finish-rolled strip from the second stand group, the core of the finish-rolled strip has a second exit temperature (TA2) lower than the first exit temperature (TA1).