ALUMIMUM ALLOY ROD FOR CONDENSER TUBE USING PROPERZI PRECESS AND THEIR MANUFACTURING METHOD

摘要

The present invention relates to aluminum alloy rods for condenser tubing using a continuous casting machine and a manufacturing method thereof, providing a manufacturing process by a continuous casting machine of aluminum alloy rods capable of manufacturing condenser tubing with a pressure resistance and a thermal conductivity, comprising; the first step of forming aluminum alloys by dissolving and alloying with addition of pure aluminum and strength-reinforcing alloying elements; and the second step of forming the aluminum alloys as casting bars; and the third step of forming rods from the casting bars by multi-stage rolling to a cross section of a given size; and the fourth step of winding the rolled aluminum alloy rods on a coil machine as the technical gist. As a result, the manufactured aluminum alloy rods have coarse intermetallic compounds present within the casting bars by dissolution and casting, and these casting bars have the intermetallic compounds finely broken up and pulverized during the multi-stage rolling to be uniformly distributed in grains or at grain boundaries. When thus formed fine intermetallic compounds are conform-extruded, precipitates dispersed in grains and at grain boundaries are dispersed more finely by extrusion pressures. There is an advantage that strength characteristics are remarkably increased due to fine and uniformly dispersed precipitates. [Reference numerals] (AA) Aluminum alloy load