In the 2000 - 8000 series aluminum, what do the last two digits represent?

In the 2000 - 8000 series aluminum, what do the last two digits represent?

• A. Various alloy additions
• B. Percent purity
• C. Heat treatment
• D. Surface finish

Answer: (A)

In this system, the digits after the series identify the exact alloy within that family by its specific makeup of alloying additions. For the 2000 series, which are Al-Cu alloys, the last two digits distinguish the particular alloy formulation (for example, different minor elements added in varying amounts). Those digits do not indicate how pure the metal is, nor do they specify heat treatment or surface finish. The heat treatment or temper is shown separately as a suffix after the alloy number (like T6 or O), not in the last two digits. So the last two digits are a code for which precise alloy within the series you have, reflecting its characteristic composition and properties.

In this system, the digits after the series identify the exact alloy within that family by its specific makeup of alloying additions. For the 2000 series, which are Al-Cu alloys, the last two digits distinguish the particular alloy formulation (for example, different minor elements added in varying amounts). Those digits do not indicate how pure the metal is, nor do they specify heat treatment or surface finish. The heat treatment or temper is shown separately as a suffix after the alloy number (like T6 or O), not in the last two digits. So the last two digits are a code for which precise alloy within the series you have, reflecting its characteristic composition and properties.