Patent ID: 8145346

Claim:
A method for monitoring a physical state of a hot-rolled, sheet, comprising: providing a rolling train with a rolling stand for reverse rolling of a hot-rolled sheet; providing a central control unit for controlling the rolling train; providing a model of the hot-rolled sheet and the rolling train stored in the central control unit; reverse rolling the hot-rolled sheet; determining, at a starting point, a physical state of the hot-rolled sheet in the model, wherein the physical state of the hot-rolled sheet is a characteristic which is described with reference to a mathematical model and which is relevant for the reverse rolling of the hot-rolled sheet; deriving a physical state variable from the physical state; cyclically updating the physical state variable during the reverse rolling of the hot-rolled sheet by using the model of the hot-rolled sheet and the rolling train, wherein an update cycle is between 0.5 and 2 seconds; and measuring operating parameters of the hot-rolled sheet or the rolling train, wherein the operating parameters are used for the cyclically updating the physical state, wherein the operating parameters are measured at a location which is different from a location of the starting point.