本规范涵盖了按公制（SI）尺寸采购的手工锻件和轧制环形式的铝合金。这些产品通常用于要求合金具有中等强度和良好可锻性的复杂形状零件，以及在加工过程中需要稳定性的零件，但使用不限于此类应用。该合金的耐蚀性优于以铜为主要合金元素的铝合金。

This specification covers an aluminum alloy in the form of hand forgings and rolled rings procured to metric (SI) dimensions. These products have been used typically for complex shaped parts requiring moderate strength and good forgeability of the alloy and where stability is required during machining, but usage is not limited to such applications. Corrosion resistance of this alloy is superior to that of aluminum alloys having copper as the principal alloying element.