| 摘要 |
PURPOSE:To produce a titled plated steel plate while economizing energy consumption and preventing the generation of vapor by spraying Al powder and sticking this powder onto the surfaces of a steel plate which is immersed in molten zinc and is pulled out therefrom before the molten zinc stuck on said surfaces solidifies then subjecting the steel plate to an alloying treatment. CONSTITUTION:After a steel plate 1 is immersed in a molten Zn pot 3 kept at about 450-460 deg.C, it is pulled upward from the pot and the plating thickness is controlled at 16, then the steel plate is heated at 5 to maintain the molten zinc on the surfaces in a molten state. The steel plate 1 in this state is fed into between the spraying boxes 7, 7 of an Al powder spraying device 6 where gases contg. Al powder heated approximately to 420-670 deg.C are sprayed from ejection ports 73 onto the surfaces of the steel plate to allow the Al powder to stick on the molten zinc on the surfaces of the steel plate. The plate 1 in this state is fed to an alloying treatment device 13 in the upper part, where it is heated for a prescribed time at <=700 deg.C, whereby the alloy layers of Al-Zn are formed on the surfaces of the steel plate. As compared to conventional dipping systems. the amt. of the Al to be used is decreased by this method. |
