[China Aluminum Industry Network] The basic status codes for aluminum alloys are as follows:
F - Free machining condition. This state is used for products that require special work hardening and heat treatment during the forming process. The mechanical properties of materials in this state are not specified, making it uncommon.
O - Annealed condition. It applies to processed products that have undergone full annealing, resulting in lower strength. This state is occasionally encountered.
H - Work-hardened condition. This refers to products that have been strengthened through cold working. After work hardening, additional heat treatment may be applied (usually on non-heat-treatable materials) to reduce the hardness or not.
W - Solution heat treatment condition. This is an unstable state, applicable only to alloys that have naturally aged at room temperature after solution heat treatment. The code W simply indicates that the product is in the natural aging stage, which is rare.
T - Heat-treated condition. Different from F, O, and H states, T is used when heat treatment (or sometimes combined with work hardening) is applied to achieve a stable product. The letter T must be followed by one or more digits, typically indicating a heat-treated and strengthened material. For non-heat-treatable aluminum alloys, the common state code is usually H followed by two digits, such as 1100-H14.
The H code is often followed by two digits. The first digit represents the type of work hardening: 1 for simple work hardening, 2 for work hardening plus incomplete annealing, 3 for work hardening plus stabilization, and 4 for work hardening followed by painting. The second digit indicates the degree of hardening achieved. Common values include 1 through 9, where higher numbers represent greater hardness.
For example, H11 represents a lightly hardened state, while H12 is slightly harder. H14 is medium-hard, H16 is high-hard, and H18 is fully hardened. In some cases, H is followed by three digits, such as H111, which means a certain amount of work hardening was done after final annealing. H112 is used for heat-processed products, and H116 refers to a 5***-based alloy containing ≥4.0% magnesium.
For heat-treatable aluminum alloys, the state code is usually a T followed by a number (TX), indicating a specific heat treatment process. For example, T0 refers to solution heat treatment followed by natural aging in the cold condition. Other TX codes denote different heat treatment sequences, providing detailed information about the material's processing history.
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