Combined casting/rolling installation for the production of a hot-rolled finished strip of steel, having - a continuous casting installation which comprises - a linear permanent mold for the continuous production of a thin slab strand which when exiting the permanent mold has a liquid core, a thickness of 60 to 75 mm, and a width of 900 to 1700 mm; - a strand guide for supporting and guiding the thin slab strand, having a secondary cooling for cooling the thin slab strand and a thickness-reduction unit for reducing the thickness of the thin slab strand, wherein the strand guide has a vertical portion below the permanent mold, subsequently an arcuate portion, and subsequently a horizontal portion, and the thin slab strand after the reduction in thickness has a thickness of 50 to 70 mm; - a controlling or regulating unit for setting the secondary cooling and the casting speed v C such that the thin slab strand solidifies to the core only in the horizontal portion of the strand guide; - a pre-rolling line for pre-rolling the thickness-reduced thin slab strand, wherein the pre-rolling line has exactly two pre-roll stands (R1, R2) and a preliminary strip having a thickness of 10 to 30 mm is generated by the pre-rolling; - a set of pendulum shears for cutting off a cold strand; - a discharging unit for discharging the cold strand, wherein the discharging unit has a thermal insulation for reducing thermal losses; - an induction furnace for heating the preliminary strip to a temperature of 1050 to 1250°C, preferably 1150 to 1200°C; - a descaling unit for descaling an upper side and a lower side of the heated preliminary strip; - a finishing rolling line for finish-rolling the descaled preliminary strip, wherein the finishing rolling line has exactly three finishing roll stands (F1, F2, F3), and a finished strip having a thickness of 1.6 to 12 mm is generated by the finish-rolling; - a cooling section for cooling the finished strip to a coiling temperature; - a set of shears for cutting off the cooled finished strip; and - a coiling unit for coiling the finished strip to coils. - a continuous casting installation which comprises - a linear permanent mold for the continuous production of a thin slab strand which when exiting the permanent mold has a liquid core, a thickness of 60 to 75 mm, and a width of 900 to 1700 mm; - a strand guide for supporting and guiding the thin slab strand, having a secondary cooling for cooling the thin slab strand and a thickness-reduction unit for reducing the thickness of the thin slab strand, wherein the strand guide has a vertical portion below the permanent mold, subsequently an arcuate portion, and subsequently a horizontal portion, and the thin slab strand after the reduction in thickness has a thickness of 50 to 70 mm; - a controlling or regulating unit for setting the secondary cooling and the casting speed v C such that the thin slab strand solidifies to the core only in the horizontal portion of the strand guide; - a linear permanent mold for the continuous production of a thin slab strand which when exiting the permanent mold has a liquid core, a thickness of 60 to 75 mm, and a width of 900 to 1700 mm; - a strand guide for supporting and guiding the thin slab strand, having a secondary cooling for cooling the thin slab strand and a thickness-reduction unit for reducing the thickness of the thin slab strand, wherein the strand guide has a vertical portion below the permanent mold, subsequently an arcuate portion, and subsequently a horizontal portion, and the thin slab strand after the reduction in thickness has a thickness of 50 to 70 mm; - a controlling or regulating unit for setting the secondary cooling and the casting speed v C such that the thin slab strand solidifies to the core only in the horizontal portion of the strand guide; - a pre-rolling line for pre-rolling the thickness-reduced thin slab strand, wherein the pre-rolling line has exactly two pre-roll stands (R1, R2) and a preliminary strip having a thickness of 10 to 30 mm is generated by the pre-rolling; - a set of pendulum shears for cutting off a cold strand; - a discharging unit for discharging the cold strand, wherein the discharging unit has a thermal insulation for reducing thermal losses; - an induction furnace for heating the preliminary strip to a temperature of 1050 to 1250°C, preferably 1150 to 1200°C; - a descaling unit for descaling an upper side and a lower side of the heated preliminary strip; - a finishing rolling line for finish-rolling the descaled preliminary strip, wherein the finishing rolling line has exactly three finishing roll stands (F1, F2, F3), and a finished strip having a thickness of 1.6 to 12 mm is generated by the finish-rolling; - a cooling section for cooling the finished strip to a coiling temperature; - a set of shears for cutting off the cooled finished strip; and - a coiling unit for coiling the finished strip to coils.