| 摘要 |
A stainless steel manufacturing method for suppressing defects of a product by controlling manufacturing process variables according to the equiaxed crystal ratio, thereby improving ridging resistance of a final cold rolled workpiece is provided. In a ferritic stainless steel manufacturing method comprising performing hot rolling, hot annealing, cold rolling and cold annealing processes on a stainless steel slab comprising, by weight percent, 0.05% or less of C, 0.7% or less of Ti, 1.0% or less of Si, 1.0% or less of Mn, 0.04% or less of P, 0.03% or less of S, 16.0 to 22% of Cr, 0.5% or less of Ni, 1.0% or less of Mo, 0.05% or less of N, 1.0% or less of Cu, 0.15% or less of Al, and the balance of Fe and other ordinary impurities to manufacture a steel sheet with a thickness of 1.5 mm or less, a method of manufacturing a ferritic stainless steel with improved ridging resistance comprises controlling a ridging prediction index to 20 or less using the following mathematical expression 1 to improve ridging resistance of the ferritic stainless steel: -25.6+0.7K+0.35xCRR+0.05xCRA, where K: -9.4xln[equiaxed crystal ratio(%)](logarithmic equiaxed crystal ratio influence on ridging), CRR: (hot rolling thickness-cold rolling thickness)x100/hot rolling thickness, and CRA: cold annealing temperature(deg.C).
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