1)Grades of processed products
The Alcoa (AA) has adopted the four-digit designation method for deformed aluminum and aluminum alloys as early as 1957 as the American National Standard (ANSIH35.1), and the major aluminum manufacturers in the United States have gradually adopted this method. (In 1970, based on the four-digit code of AA standard, the international four-digit system for deformed aluminum and aluminum alloys was produced, which is called IDS for short, and the deformed aluminum and aluminum alloys part of AA standard has become an international standard. (1) The first digit of the four-digit code of AA standard indicates the grouping by main alloying elements, and the division of the group is as follows.
1XXX pure aluminum (aluminum content not less than 99.00%).
2XXX AL-CU alloy.
3XXX AL-MN alloy.
4XXX AL-SI alloys.
5XXX AL-MG alloys.
6XXX AL-MG-SI alloys.
7XXX AL-ZN alloys.
8XXX alloys of aluminum and other elements.
(2) the second digit of the four-digit designator, indicating the case of reforming, or the control of impurities and combined elements
3) The last two digits of the four-digit designator (both the 3rd and 4th digits), which have the following meanings.
For group 1XXX, the last two digits indicate the two digits after the decimal point of the minimum percentage content of pure aluminum (99.00%), for example: grade 1085, indicating ΨAL9985%.
For group 2XXX-8XXX, the last two digits have no specific meaning and are only used as sequential numbers to identify different aluminum alloys in the same group.

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