State code of deformed aluminum alloy

Codename

Name

Description and application

F

Free processing status

Applicable to products with special requirements for work hardening and heat treatment conditions during the forming process, the mechanical properties of the product are not specified

O

Annealed state

Suitable for processed products that have been fully annealed for lowest strength

H

Work hardening state

Applicable to products that increase strength by work hardening. After the work hardening, the product can pass through (or not) the additional heat treatment to reduce the strength. The H code is followed by two or three Arabic numerals.

T

Heat treatment state (different from F, O, H state)

Applicable to products that have been stabilized after (or without) work hardening after heat treatment. The T code must be followed by one or more Arabic numerals.

Status code

Description and application

TO

After solution heat treatment, it passes through the state of cold working through natural aging.

Suitable for products that have been cold worked to increase strength

T1

It is cooled by a high temperature molding process and then naturally aged to a substantially stable state.

Applicable to products that are cooled after the high temperature forming process and are not subjected to cold working (straightening and leveling, but without affecting the mechanical properties).

T2

It is cooled by a high-temperature molding process and naturally aged to a substantially stable state after cold working. Suitable for products that are cooled by high temperature forming process, cold worked, or straightened and leveled to increase strength

T3

After solution heat treatment, cold working is performed, and then, natural aging to a substantially stable state. Suitable for products that are cold worked, or straightened and leveled to improve strength after solution heat treatment

T4

After solution heat treatment, it is naturally aged to a substantially stable state. Applicable to products that are not subjected to cold working after solution heat treatment (straightening and leveling, but not affecting the limit of mechanical properties)

T5

It is cooled by a high temperature molding process and then subjected to an artificial aging state.
It is suitable for products that are artificially aged after being cooled by a high-temperature molding process without cold working (straightening and leveling, but not affecting the limit of mechanical properties).

T6

A state of artificial aging after heat treatment by solution heat treatment.
Applicable to products that are not subjected to cold working after solution heat treatment (straightening and leveling, but not affecting the limit of mechanical properties).

T7

A state of artificial aging after heat treatment by solution heat treatment.
Applicable to products that have passed the solution heat treatment, in order to obtain some important characteristics, the strength exceeds the highest peak point on the aging curve during artificial aging,

T8

After solution heat treatment, it is cold worked and then subjected to artificial aging.
Applicable to cold-worked, or straightened, leveled to improve product strength.

T9

The solution is artificially aged after solution heat treatment, and then subjected to cold working.
Suitable for products that have been cold worked to increase product strength.

T1O

After being cooled by the high-temperature molding process, it is subjected to cold working and then subjected to artificial aging.
Suitable for products that have been cold worked, or straightened, leveled to increase product strength.

Note: Some alloys of 6XXX, whether in the furnace solution heat treatment or quenching from the high temperature forming process to retain the soluble components in the solid solution, can achieve the same solution heat treatment effect, T3, T4, T6, The T7, T8 and T9 states may be any of the above two treatment methods.

Status code

Description and application

T42

It is suitable for products with natural aging to achieve sufficient stability after solution heat treatment in O or F state. It is also suitable for products with mechanical properties reaching T42 after heat treatment of processed products in any state.

T62

Applicable to products that have entered artificial aging after O-F state solution heat treatment, and are also suitable for products with mechanical properties reaching T62 after heat treatment of processed products in any state by demander

T73

Applicable to products with aging treatment to achieve the specified mechanical properties and stress corrosion resistance after solution heat treatment

T74

Same as the T73 state definition. The tensile strength of this state is greater than the T73 state, but less than the T76 state

T76

Same as the T73 state definition. The tensile strength of this state is higher than that of T73 and T74 respectively, and the stress corrosion cracking resistance is lower than T73 and T74, respectively, but its anti-flaking corrosion performance is still good

T7X2

Applicable to products with artificial aging treatment after solid solution heat treatment in O or F state, mechanical properties and corrosion resistance up to T7X state

T81

Applicable to solid solution heat treatment, after 1% cold work deformation to increase strength, and then artificial aging products

T87

Applicable to solid solution heat treatment, after 7% or so of cold work deformation to increase strength, and then artificial aging products

Status code

Description and application

TX51

TXX51

TXXX51

Applicable to products with aging treatment to achieve the specified mechanical properties and stress corrosion resistance after solution heat treatment

T74

Same as the T73 state definition. The tensile strength of this state is greater than the T73 state, but less than the T76 state

T76

Same as the T73 state definition. The tensile strength of this state is higher than that of T73 and T74 respectively, and the stress corrosion cracking resistance is lower than T73 and T74, respectively, but its anti-flaking corrosion performance is still good

T7X2

Applicable to products with artificial aging treatment after solid solution heat treatment in O or F state, mechanical properties and corrosion resistance up to T7X state

T81

Applicable to solid solution heat treatment, after 1% cold work deformation to increase strength, and then artificial aging products

T87

Applicable to solid solution heat treatment, after 7% or so of cold work deformation to increase strength, and then artificial aging products

Status code

Description and application

TX51

TXX51

TXXX51

Suitable for solution heat treatment or thick plate, rolled or cold finished bar and die forging, forging ring or rolling ring which are stretched according to the specified amount after cooling in the high temperature forming process. These products are no longer stretched after stretching. Straighten.
The permanent deformation of the thick plate is 1.5%~3%; the permanent deformation of the rolled or cold finished bar is 1%~3%; the permanent deformation of the forged ring or the rolling ring of the die forging is 1%~5%

TX510

TXX510

TXXX510

Suitable for solution heat treatment or extrusion rods, pipes and pipes which are stretched in a specified amount after cooling from a high temperature forming process, and drawn pipes, which are not straightened after stretching.
The permanent deformation of the extruded rod, type and tube is 1%~3%; the permanent deformation of the drawn tube is 1.5%~3%

TX511

TXX511

TXXX511

Suitable for solution heat treatment or extrusion rods, profiles and tubes which are stretched according to the specified amount after cooling from the high temperature forming process, and drawn pipes, these products can be straightened to meet the standard tolerance after stretching.
The permanent deformation of the extruded rod, type and tube is 1%~3%; the permanent deformation of the drawn tube is 1.5%~3%

TX52

TXX52

TXXX52

Suitable for solution heat treatment or after cooling from high temperature forming process, stress is relieved by compression to produce 1%~5%, permanent deformation product

TX54

TXX54

TXXX54

Suitable for die forgings that are relieved by cold shaping in a final forging die