| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy extruded material having excellent bending workability and energy absorbability. SOLUTION: A method for manufacturing the aluminum alloy extruded material having excellent bending workability and energy absorbability comprises steps of extruding an aluminum alloy containing by mass% one or more types selected from the group composed of 0.4 to 1.0% of Si, 0.5 to 1.0% of Mg, 0.05 to 0.6% of Cu, 0.1 to 0.4% of Fe, 0.005 to 0.1% of Ti, 0.0001 to 0.004% of B, and further 0.02 to 0.6% of Mn, 0.02 to 0.3% of Cr, 0.02 to 0.25% of Zr and a composition containing the residue of Al and unavoidable impurities at an extruding speed V (m/s) decided according to a distance X (m) from the end of a die to a cooling unit, and then regulating a quenching delay time t (=X/V) falling within a range of 0≤t≤12 s. COPYRIGHT: (C)2003,JPO
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