Method for the online determination of at least one rolling parameter, and rolling mill with a device for the online determination of at least one rolling parameter

A method for the online detection of at least one rolling parameter when rolling a rolled material (20) rolled along a rolling line (13) in a rolling mill (10) comprising at least two rollers (12) on a rolling stand (11) where the rolled material (20) is a rod or a pipe and where rolled material (20) is passed by or passed through at least one measurement device (31) during rolling, which measures a varying rolled material parameter of the rolled material (20) along the longitudinal extension (21) of the rolled material (20) and outputs a measurement signal (40), wherein the measurement device (31) measures perpendicular to the rolling line (13) across the circumference of the rolled material (20) in an integrating and/or averaging manner and

• (i) the measurement signal (40) is transferred to the frequency space and the rolling parameter is detected from the measurement signal transferred to the frequency space (40), and/or
• (ii) a frequency inherent in the change in said rolled material parameter of the rolled material (41) is detected from the measurement signal (40), while said rolled material (20) is passing by or passing through said measurement device (31) during rolling, and wherein said rolling parameter is detected on the basis of said frequency (41) detected from the measurement signal (40).