To provide, as a material of an automobile door beam, an extruded 7000 series aluminum alloy material having excellent SCC resistance in a higher strength region (proof stress of 460 MPa or higher) than conventional ones.SOLUTION: The extruded 7000 series aluminum alloy material contains Zn of 7.5-9.0 mass%, Mg of 1.3-2.0 mass%, Cu of 0.1-0.7 mass%, Si of 0.15 mass% or less, Fe of 0.3 mass% or less, Ti of 0.005-0.2 mass%, one kind or more of Mn, Cr, and Zr of 0.1-0.5 mass%, with Mn of 0.3 mass% or less, Cr of 0.25 mass% or less, and Zr of 0.25 mass% or less, and the balance composed of Al and impurities. The material contains an Fe-based crystallized material having an average Cu content of 5.0 mass% or less.SELECTED DRAWING: None
【課題】自動車のドアビームの素材として、これまでより高い強度領域(耐力が460MPa以上)において優れた耐SCC性を備えた7000系アルミニウム合金押出材を提供する。【解決手段】7000系アルミニウム合金押出材が、Zn:7.5〜9.0質量%、Mg:1.3〜2.0質量%、Cu:0.1〜0.7質量%、Si:0.15質量%以下、Fe:0.3質量%以下、Ti:0.005〜0.2質量%、さらにMn,Cr,Zrの1種以上をMn:0.3質量%以下、Cr:0.25質量%以下、Zr:0.25質量%以下の範囲内で0.1〜0.5質量%、残部Al及び不純物からなり、Fe系晶出物を含み、その平均Cu含有量が5.0質量%以下である。【選択図】なし
AUTOMOBILE DOOR BEAM MADE OF EXTRUDED ALUMINUM ALLOY MATERIAL
アルミニウム合金押出材からなる自動車のドアビーム
2020-10-08
Patent
Electronic Resource
Japanese
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