ALUMINUM ALLOY FORGED PRODUCT AND METHOD FOR PRODUCING THE SAME

To provide an aluminum alloy forged product with superior mechanical properties at room temperature and a method for producing the same.SOLUTION: An aluminum alloy forged product has an alloy composition that comprises Cu of 0.30-1.0 mass%, Mg of 0.80-1.8 mass%, Si of 0.90-1.9 mass%, Mn of 0.30-1.25 mass%, Fe of 0.31-1.0 mass%, Zn of 0.26-1.0 mass%, Cr of 0.050-0.30 mass%, Ti of 0.012-0.035 mass%, B of 0.0010-0.030 mass%, and Zr of 0.0010-0.050 mass%, where the ratio of Fe content to Mn content, Fe/Mn, is less than 1.2 in mass ratio, with the balance being Al and unavoidable impurities. When the 0.2% proof stress in the longitudinal center of the long part is defined as P1 and the 0.2% proof stress at the longitudinal boundary between the long part and the connection part is defined as P2, the P1/P2 value is 1.09 or less.SELECTED DRAWING: Figure 1 【課題】常温における機械的特性に優れたアルミニウム合金製鍛造品及びその製造方法を提供する。【解決手段】アルミニウム合金製鍛造品は、Ｃｕを０．３０～１．０質量％、Ｍｇを０．８０～１．８質量％、Ｓｉを０．９０～１．９質量％、Ｍｎを０．３０～１．２５質量％、Ｆｅを０．３１～１．０質量％、Ｚｎを０．２６～１．０質量％、Ｃｒを０．０５０～０．３０質量％、Ｔｉを０．０１２～０．０３５質量％、Ｂを０．００１０～０．０３０質量％、Ｚｒを０．００１０～０．０５０質量％で含有し、Ｍｎの含有量に対するＦｅの含有量の比Ｆｅ／Ｍｎが質量比で１．２未満であり、残部がＡｌ及び不可避不純物からなる合金組成を有し、前記長尺部の長手方向の中央部の０．２％耐力をＰ１、長尺部と連結部の長手方向の境界部の０．２％耐力をＰ２としたとき、Ｐ１／Ｐ２の値が１．０９以下である。【選択図】図１