[China Aluminum Industry Network] aluminum alloy basic status code:
F free machining state. Applicable to products with special requirements for work hardening and heat treatment in the molding process, the mechanical properties of this state product are not specified (uncommon)
O annealing state. Applicable to processed products that have been fully annealed for lower strength (occasionally occurs)
H work hardening state. Applicable to products that have been strengthened by work hardening to increase the strength of the product. After the product has been worked and hardened, additional heat treatment (usually non-heat-strengthened material) may be used to reduce the strength (or not).
W solid solution heat treatment state. An unstable state that applies only to alloys that have been naturally aged at room temperature after solution heat treatment. This state code only indicates that the product is in the natural aging stage (uncommon).
T heat treatment state (different from F, O, H state). Applicable to heat treatment, after (or not) work hardening to achieve a stable product. The T symbol must be followed by one or more Arabic numerals (usually a heat-treated reinforced material). The common state code behind our common non-heat-treatable aluminum alloy is usually the letter H plus two digits. Such as 1100H14.
The following is a brief introduction to the meaning of the following status codes. The letter H is usually followed by two digits: the first digit is the method of work hardening. Behind the H number is: 1,2,3,4
That is, H1*H1* means simple work hardening process. H2*H2* means work hardening and incomplete annealing. H3*H3* means work hardening and stabilization process. H4*H4* means work hardening and painting process. The second digit means that The degree of hardening achieved by the material. The second digit behind H is: 1,2,3,4,5,6,7,8,9
Hardness between H*10 and 2 H*21/4 Hardness Hardness between H*32 and 4 H*41/2 Hardness Hardness between H*54 and 6H*63/4 Hard H*76 and Hardness between 8 H*8 Full Hard State H*9 Hardened state (H is followed by three digits in a few cases, only a few. H111 indicates that an amount of work hardening has been performed after final annealing. H112 indicates that For heat-processed products, H116 is a product made of a 5***-based alloy containing ≥4.0% magnesium.)
The common state code behind the heat treatment-strengthened aluminum alloy is generally an Arabic numeral with 0-10 behind the letter T, indicating a subdivided state (called TX state). The number following T indicates the heat treatment program for the product. T0 solution heat treatment, after natural aging through the cold state.
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