The effect of Hot Direct Rolling(HDR) process and Direct Hot Charged Rolling (D-HCR) process between continuous casting and hot strip mill was studied by the simulate calculation and the real operation.
1) HDR process is superior in heat consumption to D-HCR process under the same ratio of these productions.
2) In D-HCR process, high-efficient furnace operation, for example using only one furnace is profitable.
3) HDR process in which the heating can be adopted in a short time and partially is superior in scale loss.
4) The temperature deviation of the strip in the rolling direction can be decreased by these process, and the effect of the quality's improvement such as the improvement of the accuracy about the dimension can be obtained.
5) Though the temperature profile in the width direction is a little different by the process, the fixed temperature for the quality is maintained in each process.
