METHOD FOR ANNEALIG-PICKLING FERRITIC STAINLESS COLD ROLLED STEEL SHEET

摘要

Comprising the steps of: annealing a ferritic stainless steel cold rolled steel sheet containing 17 to 21% by weight of Cr, 0.30 to 0.6% of Si, 0.1 to 0.5% of Nb and 0.1 to 0.4% of Ti, A step of subjecting the ferritic stainless steel cold-rolled steel sheet to a neutral salt electrolytic pickling step, and a step of pickling the ferritic stainless steel cold-rolled steel sheet subjected to neutral salt electrolytic pickling with a mixed acid solution containing nitric acid and hydrofluoric acid, A method for annealing and pickling a ferritic stainless steel cold rolled steel sheet wherein the thickness of the Si oxide in the annealing scale of the cold-rolled steel sheet is 80 nm or less and the ratio of the Si oxide to the thickness of the annealing scale is 0.5 or less.