CLEANING OF COLD ROLLED STAINLESS STEEL STRIP

• Main Authors: SATO TAKASHI, KIKUYAMA MASATAKE, TSUZUKI SATOSHI
• Format: Patent
• Language: English
• Published: 05.03.1999
• Edition: 6
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY

PROBLEM TO BE SOLVED: To prevent a pattern from being generated on the surface of a cold rolled stainless steel strip after annealing and picking in a cleaning method of the cold rolled stainless steel strip. SOLUTION: Alkaline cleaning of the cold rolled stainless steel strip before annealing is achieved by using an alkaline aqueous solution containing thiosulfate ions of a prescribed concentration. The alkaline cleaning solutions is fed from an alkaline cleaning solution tank 17 into an electrolytic tank of an alkaline electrolytic defatting device 12. The thiosulfate aqueous solution of the prescribed concentration is fed from a thiosulfate aqueous solution tank 18 into the alkaline cleaning solution tank 17.