Title:
COATED HOT DIP Al-Zr ALLOY PLATED STEEL SHEET HAVING EXCELLENT WORKABILITY AND CORROSION RESISTANCE
Document Type and Number:
Japanese Patent JP3566261
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a coated hot dip Al-Zn alloy plated steel sheet which has excellent workability and corrosion resistance.
SOLUTION: The front and back faces of a steel sheet are respectively provided with an Al-Zn alloy plated layer consisting of dendrite parts, an interdendrite part present on the space between the dendrite parts, and a boundary alloy layer present on their boundaries. Either or both of the surface and back faces are provided, as an upper layer of the Al-Zn alloy plated layer, with a chemical conversion treatment layer, or an organic coating film layer via a primer layer as well. The Al-Zn alloy plated layer contains, by mass, 25 to 75% Al, >1 to 5% Si, and Sr in the range of 0.2 to 2% of the Si content, or further contains one or more kinds selected from Cr, V and Zr by 0.01 to 2.0% in total. Further, the concentration of Sr in the interdendrite part is preferably 20 to 150 times the average Sr concentration in the Al-Zn alloy plated layer.
Inventors:
Chisuko Maeda
Hideo Takamura
Hideo Takamura
Application Number:
JP2002076443A
Publication Date:
September 15, 2004
Filing Date:
March 19, 2002
Export Citation:
Assignee:
jfe Steel Corporation
jfe steel plate corporation
jfe steel plate corporation
International Classes:
B05D7/14; B32B15/08; C22C21/10; C23C2/06; C23C2/12; C23C2/26; C23C28/00; (IPC1-7): C23C2/12; B05D7/14; B32B15/08; C22C21/10; C23C2/06; C23C2/26; C23C28/00
Domestic Patent References:
| JP6340957A | ||||
| JP11343555A |
Attorney, Agent or Firm:
Eiichi Kobayashi
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