- 铝 (Al): 95.7-98.0%
- 镁 (Mg): 0.2-1.0%
- 锰 (Mn): 0.2-0.8%
- 铬 (Cr): ≤0.05%
- 钛 (Ti): ≤0.15%
- 铁 (Fe): 0.4-0.7%
- 硅 (Si): 0.4-0.7%
- 铜 (Cu): ≤0.10%
- 锌 (Zn): ≤0.25%
- 钴 (Co): ≤0.05%
- 镍 (Ni): ≤0.05%
- 硼 (B): ≤0.05%
- 其余为杂质
铝:余量 铜:0.10-0.20% 镁:0.20-0.40% 硅:0.40-0.80% 锰:0.15-0.35% 铁:0.35-0.65% 钛:0.02-0.10% 锌:≤0.10% 其他:≤0.15%