| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot dip galvanized steel sheet in which the glossiness is reduced by controlling the surface configuration over the whole length and width of a coil and which has sufficiently practical glare-proofness, and to provide a method for manufacturing the same relatively easily and stably. SOLUTION: The hot dip galvanized steel sheet having excellent glare-proofness is characterized in that, in a roughness curve on an optional surface of the steel sheet, the arithmetical average roughness Ra is 0.3-2.0μm, the average length RSm of contour curve elements in the roughness curve is >100μm and≤300μm, and Al-based oxide having circle-equivalent diameters of 0.05-1.0μm exists in an amount of at least 5 pieces or more per 10×10μm<SP>2</SP>of an optional surface of the steel sheet. The hot dip galvanized steel sheet is obtained by controlling the cooling conditions after hot dip galvanizing and the roughness of work rolls for temper-rolling. COPYRIGHT: (C)2010,JPO&INPIT |
