1 铝合金锭化学成份 ALUMINIUM ALLOY INGOT CHEMICAL COMPOSITION(%) (日本工业标准 JISH) JISH2211:1999 (Cu)铜 (Si)硅 (Mg)镁 (Zn)锌 (Fe)铁 (Mn) 锰 (Ni) 镍 (Ti) 钛 (Pb)铅 (Sn)锡 (Cr)鉻 (AI) 铝 AC1A(AC1A.1) 4.0-5.0 1.20Max 0.15Max 0.30Max 0.50Max 0.30Max 0.05Max 0.25Max 0.05Max 0.05Max 0.05Max BAL AC1B(AC1B.1) 4.2-5.0 0.3max 0.2-0.35 0.10Max 0.3Max 0.10Max 0.05Max 0.05-0.35 0.05Max 0.05Max 0.05Max BAL AC2A(AC2A.1) 3.0-4.5 4.0-6.