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Title:
GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME
Document Type and Number:
Japanese Patent JP2006061952
Kind Code:
A
Abstract:

To provide a hot dip galvanized steel sheet excellent in sharpness after painting, as regards the hot dip galvanized steel sheet which is used, for example, by painting it after press-forming it, and the manufacturing method of the same.

The galvanized surface after skin pass rolling is made to satisfy conditions described hereunder by performing the hot dip galvanizing. Wca≤0.6 μm, M≤60%, ppi≥200, d≥1 μm. Where, Wca is the height (μm) of the filtered center-line waviness when the cut-off value of a surface filtered waviness curve is taken as 0.8 mm, M is the area ratio (%) in a part to which skin pass rolling is not applied, and here, M is a value which is determined by the following formula when S0 is the area of the observation visual-field and S1 is the area of a part of the field to which the skin pass rolling is applied, M={(S0-S1)/S0}×100, ppi is the number of the peaks of projecting parts having height of ≥ 5 μm from the center line of a roughness curve per 25.4 mm in length in the direction of the average line of the roughness curve when the cut-off value of the roughness curve is taken as 0.8 mm, and d is the average depth (μm) of dull marks.


Inventors:
MATSUNAGA TAKAHIRO
Application Number:
JP2004248358A
Publication Date:
March 09, 2006
Filing Date:
August 27, 2004
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
B21B1/22; B21B27/00; C23C2/06; C23C2/26; C23C2/40
Domestic Patent References:
JP2003306754A2003-10-31
JP2004035907A2004-02-05
JP2003080302A2003-03-18
JP2006061953A2006-03-09
Attorney, Agent or Firm:
Shoichi Hirose