Problem to be solved: to provide a coating film polishing apparatus, a steel material processing system capable of polishing a coating film such as a shop primer or the like in a welded portion of the steel member during the movement of a long steel member such as an L-shaped steel member, and suppressing the occurrence of a weld defect in a welding work in a later step A coating film polishing method and a steel plate processing method are provided.Solution: a coating film polishing apparatus for polishing a coating film at a corner of an end surface 32c of a long steel plateA plane 32A adjacent to an end surface 32c of the steel memberEach of sides 32B is provided with a first surface blasting device 11a and a second surface blasting device 11b that can be contacted with the brush while rotatingThe brush 1 is provided with a brush brush changing mechanism for changing the distance between the tip end of the brush of the first surface blasting device 11a and the tip end of the brush of the second surface blasting device 11b.Diagram
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