A sheet metal rolling apparatus for rolling a sheet metal, said sheet metal rolling apparatus comprising: a first roll stand (A, B) and a second roll stand (B, C) positioned in series in a conveyance direction along which the sheet metal is conveyed, wherein each of the first and second roll stands includes a pair of rolls through which the sheet metal is rolled; a first set of cooling nozzles adapted to discharge a cooling fluid to an entry surface of rolls of the first roll stand (A, B), the first set of cooling nozzles comprising one or more cooling nozzles; and a second set of cooling nozzles (6, 7) adapted to discharge the cooling fluid to exit surfaces of the work rolls of the first roll stand, the second set of cooling nozzles comprising one or more cooling nozzles; characterized in that the sheet metal rolling apparatus further comprises: a heat exchanger system that cools the cooling fluid heated by the work rolls after discharge from the first and second sets of cooling nozzles (5, 6, 7) sufficiently for subsequent discharge through the first and second sets of cooling nozzles, wherein the heat exchanger system comprises: a first heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a first temperature; and a second heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a second temperature lower than the first temperature; and a piping system through which the cooling fluid collected after discharge is transported to the heat exchanger system and the first and second sets of cooling nozzles (5, 6, 7), the piping system being configured such that cooling fluid exiting the first heat exchanger is discharged by the first set of cooling nozzles and cooling fluid exiting the second heat exchanger is discharged by the second set of cooling nozzles. a first roll stand (A, B) and a second roll stand (B, C) positioned in series in a conveyance direction along which the sheet metal is conveyed, wherein each of the first and second roll stands includes a pair of rolls through which the sheet metal is rolled; a first set of cooling nozzles adapted to discharge a cooling fluid to an entry surface of rolls of the first roll stand (A, B), the first set of cooling nozzles comprising one or more cooling nozzles; and a second set of cooling nozzles (6, 7) adapted to discharge the cooling fluid to exit surfaces of the work rolls of the first roll stand, the second set of cooling nozzles comprising one or more cooling nozzles; characterized in that the sheet metal rolling apparatus further comprises: a heat exchanger system that cools the cooling fluid heated by the work rolls after discharge from the first and second sets of cooling nozzles (5, 6, 7) sufficiently for subsequent discharge through the first and second sets of cooling nozzles, wherein the heat exchanger system comprises: a first heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a first temperature; and a second heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a second temperature lower than the first temperature; and a heat exchanger system that cools the cooling fluid heated by the work rolls after discharge from the first and second sets of cooling nozzles (5, 6, 7) sufficiently for subsequent discharge through the first and second sets of cooling nozzles, wherein the heat exchanger system comprises: a first heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a first temperature; and a second heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a second temperature lower than the first temperature; and a first heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a first temperature; and a second heat exchanger configured to transfer heat from the heated cooling fluid to cool the cooling fluid to a second temperature lower than the first temperature; and a piping system through which the cooling fluid collected after discharge is transported to the heat exchanger system and the first and second sets of cooling nozzles (5, 6, 7), the piping system being configured such that cooling fluid exiting the first heat exchanger is discharged by the first set of cooling nozzles and cooling fluid exiting the second heat exchanger is discharged by the second set of cooling nozzles.