Abstract:
The present invention relates to aluminum alloy compositions, aluminum extrusion tubes for intercoolers with an improved corrosion resistance including the same while containing manganese (Mn), magnesium (Mg), copper (Cu), silicon (Si), iron (Fe) and further containing zirconium (Zr) and a balance of aluminum (Al) that can be applied to severe conditions according to the use of a low-pressure exhaust gas recirculation (LP-EGR) apparatus due to an excellent corrosion resistance in comparison with conventional aluminum materials for heat exchangers and that has an effect of increasing a penetration resistance of materials in comparison with pitting corrosion by being induced to cause a uniform corrosion, and a manufacturing method thereof comprising; a step of preparing a molten bath by dissolution after introducing the aluminum alloy composition in an electric furnace; and a step of producing billets of 6 inches in diameter from the molten bath using a continuous casting machine for billets; and a homogenizing step of an interior by removing segregation following air cooling after maintaining the billets at 550 for 24 hours; and a step of introducing an extruder by direct extrusion after preheating the homogenized billets at 520°C to produce the same in a tube shape; and a step of cutting and washing the billets produced in a tube shape.
Abstract:
A roof carrier bar is provided to reduce the entire weight without changing the exterior by forming a groove on the lining of a hollow pipe. A roof carrier bar installed to a vehicle includes a plurality of groove(20) formed along the length in the lining of a hollow pipe. The bar is made of an alloy. The alloy is constituted with Fe less than 0.2wt.%, Cu less than 0.1wt.%, Cr less than 0.1wt.%, Mg of 0.5~0.8wt.%, Si of 1.0~1.2wt.%, Mn of 0.1~0.2wt.%, Zn of 0.1~0.2wt.%, Sc less than 0.1wt.%, and residual aluminum.