Patent ID: 7790241
Filing Date: 2010-09-07
Classification: C23C,Y10T

Abstract:
1. A method for manufacturing a steel tube with superior corrosion-resistance, the method comprising the steps of: preheating a steel tube formed through a milling process; maintaining the temperature of the preheated steel tube above a predetermined temperature, and creating a reduction atmosphere; plating the molten alloy over the surface of the steel tube by melting an Al—Zn alloy containing 55 wt % of aluminum and 43.4-44.9 wt. % of zinc, and inserting a level block into the molten alloy to raise the level of the alloy, wherein fluctuation of the molten alloy around a plating part is prevented by a separator, and the level is raised, so that the alloy is introduced in the plating part; cooling the steel tube; and coating the surface of the steel tube with a resin.