METHOD FOR PICKLING HOT ROLLED STEEL SHEET FOR STAINLESS STEEL, Fe-Ni BASED ALLOY AND Ni-BASED HIGH ALLOY HAVING EXCELLENT SURFACE QUALITY

• Main Authors: YUNOKI KAZUYA, HORIUCHI AKIRA, ITO OSAMU, YANAI TOSHIHIKO, HAYAKAWA TAKASHI
• Format: Patent
• Language: English
• Published: 21.06.2007
• 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 provide an optimum pickling treatment method in the preceding stage of a pickling process in hot rolling-annealing for a stainless steel, an Fe-Ni based alloy and an Ni based high alloy for reducing the using amount of acid exerting serious influence on the quality and environment. SOLUTION: The invention is a pickling method for obtaining a stainless steel sheet, an Fe-Ni based alloy and an Ni based high alloy sheet having improved pickling capacity and excellent surface quality by performing descaling with a pickling liquid essentially consisting of sulfuric acid-Fe3+-hydrogen peroxide-chloride salt and heated at 70 to 85°C. COPYRIGHT: (C)2007,JPO&INPIT