Al-Mg-Si BASED ALUMINUM ALLOY SHEET AND METHOD FOR MANUFACTURING THE SAME

• Main Authors: HASHIMOTO TAKAHIRO, AKIYOSHI RYUTARO, SHISHIDO HISAO, AOKI TAKURO, MAEKAWA MASAYA
• Format: Patent
• Language: English; Japanese
• Published: 24.05.2024
• Subjects: ALLOYS; CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; TREATMENT OF ALLOYS OR NON-FERROUS METALS

To provide an Al-Mg-Si based aluminum alloy sheet having excellent surface properties and formability even when the temperature increase rate or heating temperature during intermediate annealing is lowered.SOLUTION: There is provided an Al-Mg-Si based aluminum alloy sheet comprising 0.50 mass% or more and 1.60 mass% or less of Si, 0.25 mass% or more and 1.00 mass% or less of Mg, 0.05 mass% or more and 0.50 mass% or less of Fe, 0.01 mass% or more and 0.30 mass% or less of Mn, 0.001 mass% or more and 0.30 mass% or less of Cu and the balance Al with inevitable impurities, wherein when the Si content is represented as [Si] by mass% and the Mg content is represented as [Mg] by mass%, [Mg]/[Si] is more than 0.50, the area ratio of the Cube orientation is 9% or less and further, when the surface is observed, the number density of the compounds having an equivalent diameter of 1.5 μm or more is 1000 pieces/mm2 or more and 10000 pieces/mm2 or less.SELECTED DRAWING: None 【課題】中間焼鈍時の昇温速度や加熱温度を低くした場合であっても、優れた表面性状及び成形性を得ることができるＡｌ－Ｍｇ－Ｓｉ系アルミニウム合金板を提供する。【解決手段】Ａｌ－Ｍｇ－Ｓｉ系アルミニウム合金板は、Ｓｉ：０．５０質量％以上１．６０質量％以下、Ｍｇ：０．２５質量％以上１．００質量％以下、Ｆｅ：０．０５質量％以上０．５０質量％以下、Ｍｎ：０．０１質量％以上０．３０質量％以下、Ｃｕ：０．００１質量％以上０．３０質量％以下、を含有し、残部がＡｌ及び不可避的不純物からなり、Ｓｉ含有量を質量％で［Ｓｉ］と表し、前記Ｍｇ含有量を質量％で［Ｍｇ］と表す場合に、［Ｍｇ］／［Ｓｉ］が０．５０超であり、Ｃｕｂｅ方位の面積率が９％以下であり、更に、表面を観察した場合に、円相当径が１．５μｍ以上である化合物の数密度が１０００個／ｍｍ２以上１００００個／ｍｍ２以下である。【選択図】なし