(1) according to whether there is alloy composition, aluminum is divided into pure aluminum and aluminum alloy. Aluminum alloy according to alloy series is divided into Al-Mn alloy, Al-Cu alloy, Al-Si alloy and Al-Mg alloy, etc..

(2) according to the pressure processing ability, can be divided into deformed aluminum and non deformed aluminum (such as: cast aluminum).

(3) according to whether the heat treatment can be strengthened, the aluminum alloy can be divided into non heat treatment, strengthening aluminum and heat treatment to strengthen aluminum. No allotrope of aluminum, aluminum, aluminum manganese alloy, aluminum magnesium alloy and may enhance the strength by heat treatment transformation. However, Al Cu and Al Mg Si alloy through solid solution precipitation strengthening phase increase strength, called heat strengthened aluminum. It is impossible to precipitate the strengthening phase by solid solution aging, and the strength is called non heat treatment to strengthen aluminum.

2. brand representation methods and status codes

(1) four digit system brand designation method, in January 1, 1997, our country began to implement GB/T16474 996, "wrought aluminum and aluminum alloy grade indication method" standard. The new designation of the deformation of aluminum and recommended Aluminum Alloy international brand registration organization of the international four digit system designation method, such as industrial pure aluminum 1070, 1060, 3003, Al-Mn alloy, Al-Mg alloy 5052, 5086 etc..

(2) four character system brand naming method. Before January 1, 1997, our country adopted the former Soviet Union brand expression method. Some of the old number of aluminum and Aluminum Alloy chemical composition and international four digits number is not entirely consistent, cannot use the international four digits instead to retain the existing domestic brands, the international four digit system brand, had to use four bit character system designation method, so as to gradually with international standards. For example: the old number LF21 chemical composition and international four bit digital system brand 3003 is not completely consistent, so the four bit system represents the brand is 3A21.

The four digit system and the four bit character system. The first number represents the categories of aluminum and aluminum alloys. The meaning is as follows:

1) 1XXX series, jujube, industrial pure aluminum;

2) 2XXX series dates Al-Cu and Al-Cu-Mn alloy,;

3) 3XXX series jujube Al-Mn alloy;

4) 4XXX series jujube Al-Si alloy;

5) 5XXX series jujube Al-Mg alloy;

6) 6XXX series jujube Al-Mg-Si alloy;

7) 7XXX series jujube Al-Mg-Si-Cu alloy;

8) 8XXX series, dates, others.

(3) the number of aluminium castings and the number of aluminium castings used in containers in China are indicated by the percentage of content of ZAl+ major alloy elements + alloy elements. For example, ZAlSi7Mg1A, ZAlCu4, ZAlMg5Si and so on.

(4) the aluminum alloy and aluminum alloy of the same grade of state code have different mechanical properties when the state is different. In accordance with GB/T16475 standard for condition code for wrought aluminum and aluminum alloy, the new status code stipulates as follows:

O jujube annealing condition
H112 jujube hot working state
Natural aging condition of T4 jujube after solid solution treatment
Artificial aging state of T5 jujube during high temperature forming process
Artificial aging condition of T6 jujube after solid solution treatment
(two) application characteristics of aluminium container and aluminium and aluminium alloy used in container specification

Application characteristics of aluminium container

(1) aluminum is easy to produce dense alumina passivation film in air and oxidizing aqueous solution. It has good corrosion resistance in some oxidizing media. The corrosion resistance of pure aluminum is better than that of stainless steel in high temperature concentrated nitric acid. Aluminum is often used as a corrosion-resistant container.

(2) the corrosion is not too strong, but the requirements for the prevention of pollution of iron medium, such as chemical fiber production medium, aluminum has good corrosion resistance, no pollution and iron materials, therefore, aluminum is often used as the material of iron contamination proof container. Other non-ferrous metal containers can also prevent iron pollution, but aluminum is the cheapest.

(3) aluminum is face centered cubic lattice, no allotropes, low temperature does not exist like ferrite brittle steel that transformation, the minimum design temperature is -269 DEG C aluminum containers. Aluminum material is often used as a cryogenic vessel. The magnesium content of aluminium in magnesium alloy is high, with Mg2Al3 intermetallic compound and Mg5Al8 precipitates in the crystals, the aluminum magnesium alloy stress corrosion sensitivity in some medium, only use not only at 65 DEG C stress corrosion, so the magnesium content of more than 3% of aluminum magnesium alloy design regulations the temperature is less than 65 DEG C. Excessive precipitation can also reduce impact toughness. Therefore, the impact toughness of Al Mg alloy with 3% Mg content and its welded joint shall be examined. Other aluminum and aluminum containers, including cryogenic aluminum containers, do not require impact toughness tests.

(4) because of the solid solution aging state, high strength, good plasticity, good weldability, the welded joint can still keep a high strength after welding. Therefore, it is often used as a high strength aluminum alloy for containers. Aluminum, especially pure aluminum, has a specified non proportional elongation stress, which produces plastic deformation at small loads. Aluminum container in use and transport, should pay attention to collision deformation.