Ⅰ.Aluminum alloy basic status code name, description and application:
| Code name | State | Application |
| F | Free processing status | It is used for products with special requirements for work hardening and heat treatment conditions during the molding process. The mechanical properties of the product in this state are not specified. |
| O | Annealing state | Suitable for processed products that have been fully annealed to obtain minimum strength. |
| H | Work hardened state | Applicable to products whose strength is increased through pre-work hardening. The product may or may not undergo additional heat treatment to reduce the strength after work hardening. |
| W | Solid baking heat treatment status | A state of uncertainty. It is only applicable to alloys that have been naturally aged at room temperature after heat treatment as shown in the figure. This status code only indicates that the product is in the natural aging stage. |
| T | Heat treatment status | Suitable for products that have been stabilized by work hardening “or not” after heat treatment. |
Ⅱ. Description and application of stress relief state codes:
| Tx51TXX51TXXX51 | Applicable to thick plates, rolled or cold-finished bars and die forgings, forged rings or rolled rings that are stretched to a specified amount after inherent heat treatment or cooling from the high-temperature forming process. These products are no longer stretched after stretching. straighten. The permanent deformation of thick plates is 1.5%-3%, the permanent deformation of rolled or cold-finished bars is 1%-3%, and the permanent deformation of die forgings, forged rings or rolled rings is 1%-5 %. |
| Tx52TXX52TXXX52 | It is suitable for products that are compressed to eliminate stress after solid solution heat treatment or high-temperature molding process to produce a permanent deformation of 1%-5%. |
| Tx510TXX510TXXX510 | It is suitable for extruded cups, shapes and pipes, and drawn pipes that are stretched to a specified amount after solution heat treatment or cooling from the high-temperature forming process. These products are not straightened after stretching. The permanent deformation of extruded rods, shapes and pipes is 1%~3%, and the permanent deformation of drawn pipes is 1.5%-3%. |
| Tx54TXX54TXXX54 | It is suitable for die forgings that are stress-relieved by cold shaping in the final forging die. |
Ⅲ. Tx subdivision status code description and application:
| Statu | Description | Application |
| T0 | After heat treatment, natural aging and then cold processing. | Suitable for products whose strength has been increased by cold processing. |
| T1 | It is cooled by the high-temperature molding process and then naturally aged to a basically stable state. | It is suitable for products that will no longer undergo cold processing after being cooled by the high-temperature forming process (straightening and leveling can be performed, but the mechanical performance limit will not be affected). |
| T2 | It is cooled by the high-temperature forming process and naturally aged to a basically stable state after cold working. | Suitable for products that are cooled by high-temperature molding processes and then cold processed or straightened to improve strength. |
| T3 | After solid solution heat treatment, cold working is carried out, and then natural aging is carried out to a basically stable state. | It is suitable for products that undergo cold processing, or straightening and leveling to improve strength after solution heat treatment. |
| T452 | After solution heat treatment, it is naturally aged to a basically stable state. | It is suitable for no cold working after solution heat treatment (it can be straightened to flattening but does not affect the mechanical performance limit). |
| T5 | A state in which it is cooled by a high-temperature molding process and then artificially aged. | It is suitable for products that have been artificially aged after being cooled by the high-temperature molding process without cold processing (straightening and leveling can be carried out without affecting the mechanical performance limit). |
| T652 | The state of artificial aging after solution heat treatment. | It is suitable for products that will not undergo cold processing after solid solution heat treatment (straightening and leveling can be performed, but the mechanical performance limit will not be affected). |
| T7 | The state of artificial aging after solution heat treatment. | It is suitable for products whose strength has crossed the highest peak on the aging curve during artificial aging in order to obtain certain important properties after solution heat treatment. |
| T8 | A state in which solution heat treatment is followed by cold working and then artificial aging. | Suitable for products that have been cold worked, straightened or flattened to improve product strength. |
| T9 | After solution heat treatment, artificial aging, and then cold working. | Suitable for products that have been cold processed to increase product strength. |
| T10 | After being cooled by the high-temperature molding process, it is cold worked and then artificially aged. | Suitable for products that have been cold processed to increase product strength. |
Ⅳ. Status description and application:
| T42 | It is suitable for products that have reached a fully stable state with natural aging after solid solution heat treatment in the 0 or F state. It is also suitable for products whose mechanical properties have reached the T42 state after the buyer heat-treats processed products in any state. |
| T62 | It is applicable to products that have entered the artificial state after solid solution heat treatment in the 0 or F state. It is also applicable to products whose mechanical properties have reached the T62 state after the buyer heat-treats processed products in any state. |
| T73 | It is suitable for products that have been aged after solid solution heat treatment to achieve the specified mechanical properties and stress corrosion resistance performance indicators. |
| T74 | Same as T73 status definition. The tensile strength of this state is greater than that of T73, but less than that of T76 state. |
| T76 | Same as 173 status definition. The flow tensile strength of this state is higher than that of the T73 and T74 states respectively, and the stress corrosion cracking resistance is lower than that of the 773 and T74 states respectively, but its resistance to puncture corrosion is still good. |
| T7X2 | It can be used for products that have undergone artificial aging treatment after solid solution heat treatment in the 0 or F sub-state, and the mechanical properties and corrosion resistance have reached the T7X state. |
| T81 | After solid solution heat treatment, the strength is increased by about 1% cold working deformation, and then the product is aged. |
| T87 | It is suitable for products that undergo ring melt heat treatment, undergo about 7% cold working deformation to increase strength, and then undergo artificial aging. |
Ⅴ. H status code description and application——The first digit after H indicates the work hardening treatment method:
| H1 | Simple work hardening state | It is suitable for the state where the required strength can be obtained through work hardening without additional heat treatment. |
| H2 | Work hardened and incompletely annealed state | It is suitable for products whose work hardening degree exceeds the specified requirements of the finished product and whose strength is reduced to the specified index through incomplete annealing. |
| H3 | Work hardening and stabilizing conditions | It is suitable for products that undergo low-temperature heat treatment after work hardening to achieve stable mechanical properties due to the heat effect during processing. |
| H4 | Work hardening and paint flow conditions | It is suitable for products that are incompletely annealed due to painting treatment after work hardening. |
Ⅵ. H status code description and application – The second number after H indicates the degree of hardening the material has achieved:
| H12 | Work hardened to 25% hardness |
| H16 | Work hardened to 75% hardness |
| H19 | Super work hardened state. The tensile strength of this material should be more than 10N/mm2 higher than that of H10 status material. |
| H24 | Partially annealed to 50% hardness after work hardening |
| H28 | Partially annealed to 100% hardness after work hardening |
| H34 | After work hardening, stabilize to 50% hardness. |
| H38 | After work hardening, stabilize to 100% hardness |
| H44 | Painted after work hardening, 50% hardness treatment |
| H48 | Painted after work hardening, 100% hardness treatment |
| H14 | Work hardened to 50% hardness |
| H18 | Work hardened to 100% hardness (fully hardened state) |
| H22 | Partially annealed to 25% hardness after work hardening |
| H26 | Partially annealed to 75% hardness after work hardening |
| H32 | After work hardening, stabilize to 25% hardness |
| H36 | After work hardening, stabilize to 75% hardness |
| H42 | Painted after work hardening, 25% hardness treatment |
| H46 | Painted after work hardening, 75% hardness treatment |
Ⅶ. H status code description and application–HXXX status:
| H111 | It is suitable for products where the final fireproof stone has undergone an appropriate amount of work hardening, but the degree of work hardening is not as good as the H1 state. |
| H112 | It is suitable for products formed by hot processing. The mechanical properties of products in this state have specified requirements. |
| H116 | Suitable for products made of 5XXX series alloys with a magnesium content of 40%. These products have specified mechanical properties and spalling corrosion resistance performance requirements. |
