This paper provides a technique to reduce the variation of exit thicknesses in a hot strip finishing mill. The feed-forward automatic gauge control (FFAGC) adjusts roll gap to reduce this variation by estimating the skid marks of exit slabs of previous stands. It plays a key role in FFAGC to filter the skid marks because it is difficult to exactly estimate the skid marks in the hard environment of the rolling plant. In this paper, an enhanced adaptive filter method is proposed to estimate the skid mark in FFAGC. The real coil data acquired under the modified FFAGC in POSCO show the effectiveness of the proposed method.
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