The meaning of aluminum alloy grades

The meaning of aluminum alloy grades

The advantages of aluminum are indeed rich and varied, including light specific gravity, small rebound during molding, high strength, good plasticity, easy control of complex forming, excellent electrical conductivity, thermal conductivity and corrosion resistance, etc. These properties make aluminum widely used in many fields, such as aviation, automobiles, construction and electronics.

Regarding the numbering of aluminum alloys, it is actually a standardized naming system used to identify and distinguish different types and properties of aluminum alloys. Aluminum alloy numbers usually consist of several numbers and letters that represent the alloy's specific composition, processing methods, and performance characteristics.

Taking international brands as an example, the number of aluminum alloy usually consists of four Arabic numerals. These four digits represent different meanings:

The first digit: indicates the group of aluminum and aluminum alloys, that is, the type of main alloying elements.

1000 series: pure aluminum;

2000 series: The main added alloying element is copper;

3000 series: The main added alloying element is manganese or manganese and magnesium;

4000 series: The main added alloying element is silicon;

5000 series: The main added alloy element is magnesium;

6000 series: The main alloying elements added are silicon and magnesium;

7000 series: The main alloying elements added are zinc and magnesium;

8000 series: new alloys that do not belong to the above alloy series.

The second digit: indicates the modified alloy with the content of main alloying elements added or the content of impurities in the original alloy.

0: indicates the original alloy;

1: Indicates that the original alloy has been modified for the first time;

2: Indicates that the original alloy has been modified for the second time.

The third and fourth digits: used to identify different aluminum alloys in the same group or indicate the purity of the aluminum.

In the numbering system of aluminum alloys, the following "-Hn" or "-Tn" are indeed chain degree symbols used to indicate the work-hardened state or heat treatment state.

Understanding the meaning of these symbols and numbers is critical to the correct selection and use of aluminum alloy materials. They help engineers, designers and materials buyers select the appropriate aluminum alloy and treatment condition based on specific application needs. At the same time, these marks also help with quality control and tracking during the production process.

"-Hn" represents the chain degree symbol of non-heat-treatable alloys. In this state, the alloy does not undergo a specific heat treatment process, but achieves the required strength and hardness through other means (such as cold working).

"-Tn" represents the chain degree symbol of the heat-treated alloy. In this state, the alloy has undergone specific heat treatment processes, such as solution treatment, aging treatment, etc., to change its internal structure and properties.