METHOD FOR PICKLING STAINLESS STEEL MATERIAL AND MANUFACTURING METHOD THEREFOR

PROBLEM TO BE SOLVED: To provide a method for pickling a stainless steel material, which needs neither of annealing treatment for a hot-rolled plate and pre-treatment for pickling, and to provide a manufacturing method therefor. SOLUTION: A pickling liquid to be used when pickling the stainless stee...

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Hauptverfasser:	SAGAWA TAKASHI, UGI TAKUMI
Format:	Patent
Sprache:	eng
Schlagworte:	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 MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for pickling a stainless steel material, which needs neither of annealing treatment for a hot-rolled plate and pre-treatment for pickling, and to provide a manufacturing method therefor. SOLUTION: A pickling liquid to be used when pickling the stainless steel material is a mixture solution comprising a hydrochloric acid solution of 70 to 200 g/L by concentration and a nitric acid solution of 40 to 150 g/L by concentration. The pickling treatment in such a mixture solution inhibits intergranular erosion due to sensitization in the vicinity of a grain boundary caused by the precipitation of Cr carbonitrides occurring in a hot rolling step, and can completely remove a black skin scale. As a result, it becomes possible to directly pickle the hot-rolled stainless steel plate after having been hot-rolled without subjecting it to the annealing treatment for the hot-rolled plate and the pre-treatment for pickling. COPYRIGHT: (C)2008,JPO&INPIT