| 摘要 |
PROBLEM TO BE SOLVED: To obtain excellent upset workability and high strength by performing aging treatment after press quenching by air cooling in an Al-Mg-Si based aluminum alloy extruded material for a door beam. SOLUTION: This extruded material has a composition in which the content of Mg is, by mass, 0.30 to 0.80%, the content of Si is 0.4 to 0.8%, the content of Si more surplus than the balance composition of Mg2Si is 0.10 to 0.50%, the content of Cu is 0.1 to 0.4%, the content of Ti is 0.005 to 0.2%, the total content of one or more kinds among Mn, Cr and Zr is 0.10 to 0.40%, and the balance Al with inevitable impurities, has a fibrous microstructure and has proof stress of >=200 MPa.
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