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3a21介紹 材料名稱：3A21鋁合金標準：GB/T3190-1996主要特徵及應用範圍：爲AL-Mn系合金，是應用最廣的一種防鏽鋁，這種合金的強度不高（稍高於工業純鋁），不能熱處理強化，故採用冷加
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