FERRITIC STAINLESS STEEL WITH A GOOD SURFACE QUALITY AND RIDGING RESISTANCE AND A MANUFACTURING METHOD THEREOF, CAPABLE OF IMPROVING THE SURFACE AND RE-RING DEFECT IN THE FINAL COLD FOLLING BOARD BY CHANGING THE MICRO-STRUCTURE IN A HOT-ROLL ANNEALED STEEL SHEET

摘要

PURPOSE: A ferritic stainless steel with a good surface quality and ridging resistance and a manufacturing method thereof are provided to disassemble a rough band structure and to reduce the pitch of a hot rolling board surface, by sufficiently recrystalling the hot rolling texture with hot rolling pressure of a hot rolling rougher higher annealing temperature.;CONSTITUTION: A ferritic stainless steel with a good surface quality and ridging resistance comprises the carbon(C) of 0.02wt%-0.08wt%, the nitrogen(N) of 0.01wt%-0.05wt%, silicone(Si) of 0.01wt%-0.50wt%, the manganese(Mn) of 0.01wt%-0.70wt%, the phosphorus(P) of 0.001wt%-0.035wt%, the sulfur(S) of 0.001wt%-0.005wt%, the chrome(Cr) of 15.0wt%-17.0wt%, the nickel(Ni) of 0.001wt-0.50wt%, the copper(Cu) of 0.01wt%-0.50wt%, the aluminum(Al) of 0.01wt%-0.2wt%, and the rest Fe and other unavoidable impurity, in a % weight. The value of G in an equation of G+10*RC4 is less than 4ea/mm. The value of RC is less than 0.15. The area rate of the white root of the ferritic stainless steel which is observed by an image analyzing of a picture, measured by observing the surface of a product in 50 times optical after cold rolling, is less than 0.5%.;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Surface layer R-Cube; (BB) Surface layer Goss; (CC) Post reduction; (DD) RM final pass reduction rate(%)