Method for continuous annealing and pickling of high chrome ferritic stainless steel plate

摘要

The present invention relates to a method for improving high chromium ferritic stainless steel pickling performance is used as a building exterior as, more particularly, to use as a conventional annealing pickling process but work rate, annealing temperature, annealing temperature and cooling and pickling performance by controlling the temperature of the salt bath is excellent in surface uniformity with excellent high chromium ferritic relates to a process for preparing a stainless steel sheet. ; continuous annealing pickling method of high chromium ferritic stainless steel sheet of the present invention, the pickling performance is excellent end surface uniformity with excellent high-chromium ferritic stainless steel sheet As a method for producing the high chromium ferritic stainless steel is C: not more than 0.01%, N: less than 0.02%, Si: less than 0.5%, Mn: less than 0.5%, P: less than 0.03%, S: less than 0.004%, O : not more than 0.01%, Ti: less than 0.18%, Nb: less than 0.4%, Cu: less than 1.0%, Al: 0.03 ~ 0.13%, Mo: less than 4%, Cr: 20 ~ 35%, and the remaining components of Fe, A method for pickling performance is excellent, and excellent surface uniformity of the final manufacturing a chromium ferritic stainless steel, the high chromium ferritic stainless steel are C: 0.01% or less, N: less than 0.02%, Si: 0.5% or less, Mn: 0.5% or less, P: not more than 0.03%, S: less than 0.004%, O: less than 0.01%, Ti: less than 0.18%, Nb: less than 0.4%, Cu: less than 1.0%, Al: 0.03 ~ 0.13%, Mo: 4 % or less, Cr: 20 ~ 35%, and the remaining components of Fe, a strip of cold-rolled high-chromium-based stainless steel to a predetermined thickness by annealing heat treatment in the range of 970 ~ 1,025 gayeoldae for cracks to form a scale on the surface steps; Further comprising cooling the heat-treated for a few seconds, the annealed strip to less than 100 ; Immersed in a salt bath phase adjusting the cooling strip in the range 400 ~ 450 for erosion of the metal salt to that of the salt bath is solidified; The strip subjected to the salt bath temperature of the sulfuric acid 55 , sulfuric acid concentration is the first step of pickling from 6 to 15%; And the primary and the pickled strip to the same temperature sulfuric acid, nitric acid, 5 to 15%, the second step of pickling in hydrofluoric acid at a concentration of 0.5 to 1.5%; Includes.