According to GB/T16474-1996 "Deformed Aluminum and Aluminum Alloy Grade Representation Method", all alloys with the same chemical composition as the alloys named by the International Grade Registration Agreement Organization for Deformed Aluminum and Aluminum Alloys (referred to as the International Grade Registration Organization), their grades are directly adopted The international four-digit number system trademarks, which are not in line with the international four-digit number system grades of deformed aluminum alloys, are named with a four-digit character grade (but the test aluminum alloy is preceded by an X before the four-digit character grade), and the chemical composition is registered as required.
The first, third, and fourth digits of the four-digit character system trademark are Arabic numerals, and the second digit is English capital letters (except letters C, I, L, N, O, P, Q, and Z). The first digit of the grade indicates the group of aluminum and aluminum alloys. For example, 1××× is industrial pure aluminum, 2××× is Al-Cu series alloy, 3××× is Al-Mn series alloy, 4× XX is an Al-Si series alloy, 5××× is an Al-Mg series alloy, 6××× is an Al-Mg-Si series alloy, 7××× is an Al-Zn-Mg series alloy, 8××× It is an Al-other element alloy, and 9××× is a spare alloy group.
Except for modified alloys, aluminum alloy groups are determined according to the main alloy elements. The main alloy elements refer to the alloy elements with the largest arithmetic mean limit content. When the arithmetic average of the limit content of more than one alloy element is the same as the maximum, the alloy group should be determined in the order of Cu, Mn, Si, Mg, Mg2Si, Zn and other elements. The second letter of the grade indicates the modification of the original pure aluminum or aluminum alloy, and the last two digits are used to identify different aluminum alloys in the same group or indicate the purity of the aluminum.
The representation method of deformed aluminum and aluminum alloy in my country is basically consistent with the more common international method.
