| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot-dip Al-Zn alloy plated steel sheet coated with a lubricating film superior in workability and corrosion resistance. SOLUTION: The hot-dip Al-Zn alloy plated steel sheet has the Al-Zn alloy plated layer consisting of dendrite parts, inter-dendrite parts existing between the dendrite parts, and an interfacial alloy layer between these interfaces, on the two sides of the steel sheet, and has a coated lubricating layer consisting of a resin coated film on one or both sides of the steel sheet, as the upper layer of the above Al-Zn alloy plated layer. The Al-Zn alloy plated layer includes, by mass ratio, 25-75% Al, 1-5% Si, and 0.2-2% Sr against the Si content, or further 0.01-2.0% in total of one or more of Cr, V, and Zr. The steel sheet includes Sr in the inter-dendrite parts, preferably having the 20-150 times higher concentration than the average Sr concentration of the Al-Zn alloy plated layer.
|
