The grade of the processed aluminum product

The grade of the processed aluminum product

The American Aluminum Association (AA) on the deformed aluminum and aluminum alloy grade representation method, both four-digit code representation method, as early as 1957 was accepted as the American national standard (ANSIH35.1), the major aluminum manufacturers in the United States gradually adopted this grade representation method, later, the United States military standard (MIL), the Society of Automotive Engineers (SAE), the American Society for Testing and Materials (ASTM), etc. have been adopted successively, and are also promoted to other countries. In 1970, based on this set of four-digit codes of AA standards, the international four-digit system grades of deformed aluminum and aluminum alloys were produced, referred to as IDS. As a result, the AA standard deformed aluminum and aluminum alloy parts have also become international standards. 1) The first digit of the four-digit code of the AA standard, indicating the grouping according to the main alloying elements, the group is divided as follows:

1XXX pure aluminum (aluminum content not less than 99.00%),

2XXX AL-CU alloy;

3XXX AL-MN alloy;

4XXX AL-SI alloy;

5XXX AL-MG alloy;

6XXX AL-MG-SI ALLOY;

7XXX AL-ZN alloy;

8XXX alloys of aluminum and other elements;

2) The second digit of the four-digit code, indicating the modification situation, or the control of impurities and combined elements,

3) The last two digits of the four-digit code (i.e. the 3rd and 4th digits), which have the following meanings:

For the 1XXX group, the last two digits indicate the two digits after the decimal point of the minimum percentage content (99.00%) of pure aluminum, for example: grade 1085, which indicates ΨAL9985%.

For groups 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.