Patent ID: 6607615
Filing Date: 2003-08-19
Classification: C22C,C22F

Abstract:
An aluminum alloy extruded material for structural members of automotive bodies, which is composed of an aluminum alloy consisting essentially of more than 2.6% by weight but 4.0% by weight or less of Si, more than 0.3% by weight but 1.5% by weight or less of Mg, more than 0.3% by weight but 1.2% by weight or less of Mn, more than 0.3% by weight but 1.2% by weight or less of Zn, more than 0.2% by weight but 1.2% by weight or less of Cu, more than 0.1% by weight but 1.5% by weight or less of Fe, 50-500 ppm of Sr or Sb, and a balance being made of Al and unavoidable impurities, having a conductivity of 48% or less based on IACS and a melting point temperature of 570Â° C. or less, and said aluminum alloy extruded material contains at least one recycled material selected from the group consisting of scraps recycled from aluminum cans and scraps of automotive aluminum parts, as at least a part of the aluminum alloy,wherein after an aluminum alloy ingot is subjected to a homogenizing treatment at a billet temperature of 520-570Â° C. for 1 hour or more, the aluminum alloy ingot is subjected to a homogenizing treatment by keeping the aluminum alloy ingot at a temperature of 400-520Â° C. for 1 hour or more, and thereafter the aluminum alloy ingot is cooled, heated and subjected to hot extrusion at a billet temperature of 330-500Â° C.