O Annealing state is suitable for the processed products with the lowest strength after complete annealing (occasionally).

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Basic status code of aluminum alloy:

F Free machining state is suitable for products with special requirements for work hardening and heat treatment conditions during molding, and the mechanical properties of products in this state are not specified (unusual).

O Annealing state is suitable for the processed products with the lowest strength after complete annealing (occasionally).

H Work hardening state is suitable for products whose strength is improved by work hardening. After work hardening, the product may or may not undergo additional heat treatment (usually non-heat treatment strengthening materials) to reduce its strength.

W solution heat treatment state is an unstable state, which is only suitable for alloys naturally aged at room temperature after solution heat treatment. This status code only indicates that the product is in the natural aging stage (abnormal).

T Heat treatment state (different from F, O, H state) is suitable for stable products after heat treatment, with or without work hardening. T code must be followed by one or more Arabic numerals (usually heat-treated reinforced materials). The status code behind our common non-heat treatment strengthened aluminum alloy is generally the letter H plus two digits.

Such as 1 100 H 14. The following briefly introduces the meaning of the following status codes.

The letter H is usually followed by two digits: the first digit indicates the method of work hardening treatment. The first number after H is: 1, 2, 3, 4.

That is, H 1* H 1* stands for simple work hardening treatment.

H2* H2* indicates work hardening and incomplete annealing.

H3* H3* stands for work hardening and stabilization treatment.

H4* H4* stands for work hardening and painting treatment.

The second number indicates the degree of hardening achieved by the material.

The second digit after H is 1, 2, 3, 4, 5, 6, 7, 8, 9.

The hardness is between H* 1 0 and 2.

H*2 1/4 hard

H * 3 hardness is between 2 and 4.

H*4 1/2 hardness H * 5 hardness is between 4 and 6.

H*6 3/4 Hard H * 7 hardness is between 6 and 8.

H*8 fully hard state H*9 superhard state

(There are not many cases where h is followed by three numbers, only a few. H 1 1 1 indicates that a proper amount of work hardening has been carried out after the final annealing. H 1 12 stands for products suitable for hot working and molding. H 1 16 refers to products made of 5 * * series alloys with magnesium content ≥4.0%. )

Our common country code after heat treatment strengthened aluminum alloy is generally the letter T plus one or more Arabic numerals to indicate the subdivision state of T, and the Arabic numerals of 0- 10 after T to indicate the subdivision state (called TX state). The number after t indicates the heat treatment procedure of the product. After T0 solution heat treatment, it is naturally aged and then cold worked. Suitable for products with improved strength after cold working.

T 1 is cooled by high temperature forming process, and then naturally aged to a basically stable state. It is suitable for products that are not cold-worked after being cooled by high-temperature forming process (straightening and straightening can be carried out without affecting the mechanical performance limit).

T2 is cooled by high temperature forming process, and naturally aged to a basically stable state after cold working. Suitable for cold working, or straightening after cooling by high temperature forming process to improve product strength.

T3 is cold-worked after solution heat treatment, and then naturally aged to a basically stable state. Suitable for cold working, or straightening after solution heat treatment to improve the strength of products.

After solution heat treatment, T4 naturally aged to a basically stable state. It is suitable for products that are naturally aged after solution heat treatment without cold working (straightening and straightening can be carried out without affecting the mechanical property limit).

T5 The state of cooling by high-temperature forming process and then artificial aging. Suitable for products that are cooled by high-temperature forming process and then artificially aged without cold working (straightening and straightening can be carried out without affecting the mechanical property limit).

T6 is an artificial aging state after solution heat treatment. It is suitable for products that are subjected to solution heat treatment and then artificial aging without cold working (straightening and straightening can be carried out without affecting the mechanical property limit).

T7 is an artificial aging state after solution heat treatment. It is suitable for products whose strength exceeds the peak point on the aging curve to obtain some important characteristics after solution heat treatment.

T8 The cold working state after solution heat treatment, and then artificial aging. Suitable for cold working, straightening and straightening to improve the strength of products.

T9 Artificial aging state after solution heat treatment and cold working. Suitable for products that have been cold-worked to improve product strength.

T 10 is a state of cooling, cold working and artificial aging by high temperature forming process. Suitable for products that have been cold-worked, straightened or leveled to improve product strength. T state and TXXX state (except stress relieving state) add an Arabic numeral (called TXX state) or two Arabic numerals (called TXXX state) after the TX state code, indicating the state that has undergone specific process treatment that obviously changes the product characteristics (such as mechanical properties and corrosion resistance).

T42 is suitable for products that have reached a completely stable state after O or F state solution heat treatment, and also for products whose mechanical properties have reached T42 state after heat treatment of processed products in any state by the buyer.

T62 is suitable for products that enter artificial aging after O or F state solution heat treatment, and also suitable for products whose mechanical properties reach T62 state after heat treatment of processed products in any state by the buyer.

T73 is suitable for products aged after solution heat treatment to achieve the specified mechanical properties and stress corrosion resistance. T74 and T73 have the same state definition. The tensile strength of this state is greater than that of T73 state, but less than that of T76 state.

T76 and T73 have the same state definition. In this state, the tensile strength is higher than T73 and T74 respectively, and the stress corrosion cracking resistance is lower than T73 and T74 respectively, but its spalling corrosion resistance is still good.

T7X2 is suitable for products with mechanical properties and corrosion resistance reaching T7X state after O or F solution heat treatment and artificial aging treatment. T8 1 is suitable for products which are subjected to solution heat treatment, cold-worked and deformed by about 1% to improve strength, and then artificially aged. T87 is suitable for products that have undergone solution heat treatment, cold working deformation of about 7% to improve strength, and then artificial aging. Stress Relief Status: Add "5 1" or "5 10" or "5 1 1" or "52" or "54" after the above TX or TXXX status code to indicate the product status code after stress relief treatment.

TX 51TXX 51TXX 51is suitable for drawing thick plates, rolled or cold-worked bars, die forgings, forging rings or rolling rings according to the specified amount after cooling by solution heat treatment or high-temperature forming process, and these products will not be straightened after drawing. The permanent deformation of thick plate is 65438 0.5% ~ 3%; The permanent deformation of rolled or cold-worked steel bars is 65438 0% ~ 3%; The permanent deformation of forging ring or rolling ring of die forgings is 1%~5%. The permanent deformation of extruded bars, dies and pipes is1%~ 3%; The permanent deformation of the drawn tube is 65438 0.5% ~ 3%.

Tx511txx511txx511is suitable for extruded bars, dies and pipes drawn in a specified amount after solution heat treatment or high temperature forming process cooling. These products can be slightly straightened after drawing to meet the standard tolerance.

Tx 52 txx 52 txx 52 is suitable for products with permanent deformation of 1%~5% after solution heat treatment or cooling in high temperature forming process.

Tx 54 txx 54 txx 54 is suitable for die forgings which can relieve stress through supercooling shaping in final forging dies. T6, solution treatment (quenching) and artificial aging.

T62, annealing or F-state solution treatment and artificial aging.

T6 1 is in a special heat treatment state, and the required strength is lower than T6.