HOT ROLLED FERRITIC STAINLESS STEEL SHEET EXCELLENT IN SURFACE PROPERTIES AND ITS PRODUCTION METHOD

• Main Authors: TERAOKA SHINICHI, MUTO IZUMI, OGAWA TOMOSHI, YOSHIOKA SHINJI, HAMADA JUNICHI
• Format: Patent
• Language: English
• Published: 17.06.2004
• Edition: 7
• 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a hot rolled ferritic stainless steel sheet with such excellent surface properties as to be free from scale remaining on the surface, defects due to falling down of intergranular corrosion grooves, or the like after pickling. SOLUTION: In pickling with a pickling solution comprising a sulfuric acid solution containing an organic compound having a carboxyl group and a S group, the ratio Vs/VFeof the concentration Vs(%) of the organic compound to the Fe ion concentration VFe(g/L) is set at 0.001 or higher and the immersion time, at 30 sec or longer. Thus, the maximum roughness Rmaxon the steel sheet surface is kept at 15 μm or less and the depth d of intergranular corrosion grooves, at 3 μm or less. COPYRIGHT: (C)2004,JPO