ULTRATHIN COLD-ROLLED STEEL SHEET FOR BUILDING MATERIAL, AND METHOD FOR MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide an ultrathin cold-rolled steel sheet which has strength and flatness required for building materials and is superior in its surface shape, particularly in its smoothness. SOLUTION: The steel sheet has a component composition comprising, by mass%, 0.01-0.10% C, 0.03%...

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Bibliographische Detailangaben
Hauptverfasser:	YOKOYAMA NAOYA, TATENO JUNICHI, MASUMOTO HIROSHI, YASUHARA HIDEKO, TOKUNAGA MUNEYASU
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an ultrathin cold-rolled steel sheet which has strength and flatness required for building materials and is superior in its surface shape, particularly in its smoothness. SOLUTION: The steel sheet has a component composition comprising, by mass%, 0.01-0.10% C, 0.03% or less Si, 0.005-0.5% Mn, 0.01-0.20% P, 0.03% or less S, 0.01-0.1% Al, 0.010% or less N and the balance Fe with unavoidable impurities; and also has a sheet thickness of 0.2 mm or less. Furthermore a surface shape of the steel sheet, which has been expressed by shape factors of A and B specified below, satisfies a relationship of an expression (1): B≤-0.08×A+1.7, wherein A represents the number of unevenness (pieces/1,500 mm) per unit length of a product; and B represents an average height (mm) of the unevenness. COPYRIGHT: (C)2010,JPO&INPIT