METHOD FOR DETERMINING PRESENCE/ABSENCE OF RISK OF OCCURRENCE OF SURFACE ROUGHNESS AND SCALE FLAW AND HOT FINISH ROLLING MILL TRAIN USING THE SAME, AND METHOD FOR DETERMINING DEGREE OF SURFACE ROUGHNESS OF WORK ROLL AND HOT FINISH ROLLING MILL TRAIN USING THE SAME

摘要

PROBLEM TO BE SOLVED: To make an attempt to improve quality of a product manufactured by hot rolling by suppressing occurrence of poor surface quality of surface roughness and scale flaw in the product.;SOLUTION: Before performing rolling of a material to be rolled with a rolling mill, when a surface roughness index φ found by a formula (A) below reaches a fixed value or more, it is determined that there is a risk of destruction of a scale of the surface of the material to be rolled and occurrence of surface roughness and scale flaw due to agglutination and when the surface roughness index φ is less than the fixed value, it is determined that there is no risk of the occurrence of surface roughness and scale flaw. Surface roughness index φ=φ0×K2/D×Σ (K1×L×P/W)...(A).;COPYRIGHT: (C)2013,JPO&INPIT