本规范涵盖砂型、永久型、复合型和熔模铸件形式的铝合金。这些铸件通常用于要求低重量、中等强度和坚固性的部件，但用途不限于此类应用。

This specification covers an aluminum alloy in the form of sand, permanent mold, composite mold, and investment castings.These castings have been used typically for components requiring low weight, moderate strength, and soundness, but usage is not limited to such applications.