The meaning of letters and numbers in aluminum alloy numbers

First digit: indicates the main added alloying elements.

1: Pure aluminum

2: The main alloying element is copper

3: The main alloying elements are manganese or manganese and magnesium

4: The main alloying element is silicon

5: The main alloying element is magnesium

6: The main alloying elements are silicon and magnesium

7: The main alloying elements are zinc and magnesium

8: New alloys that do not belong to the above alloy families

The second digit: indicates the alloy with modified alloying element content or impurity content mainly added to the original alloy.

0: Omotero alloy

1: The original alloy has been modified for the first time

2: The original alloy has been modified for the second time

3rd and 4th digits:

Pure aluminum: indicates the original alloy

Alloy: Indicates the code name of an individual alloy

"-": Hn or Tn after indicates the chain symbol of the work-hardened state or heat treated state -Hn : the chain symbol of the non-heat treated alloy

-Tn: Indicates the chain degree symbol of the heat-treated alloy

T5: Indicates the state of cooling by the high-temperature molding process and then artificial aging. It is suitable for aluminum profile products that are cooled by the high-temperature forming process and are not subjected to cold processing (can be straightened and leveled, but does not affect the limit of physical performance) and are artificially aged.