The first number 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 hard
H * 5 hardness is between 4 and 6.
Height *6 3/4 inches
H * 7 hardness is between 6 and 8.
H*8 full 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 represents products made of 5 * * series alloys with magnesium content ≥4.0%. The country code behind our common heat-treated strengthened aluminum alloy is generally the letter T plus one or more Arabic numerals to indicate the subdivision state of T.
Adding 0- 10 Arabic numerals after t indicates subdivision state (called TX state). The number after t indicates the heat treatment procedure of the product.
T0
After solution heat treatment, natural aging, and then cold working.
Suitable for products with improved strength after cold working.
T 1
Cooling by a high-temperature forming process, and then naturally aging 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
Cooling by high-temperature forming process, and naturally aging 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
Cold working is carried out after solution heat treatment, and then natural aging is carried out to a basically stable state. Suitable for cold working, or straightening after solution heat treatment to improve the strength of products.
T4
After solution heat treatment, it is naturally aged to a basically stable state. Suitable for products without cold working after solution heat treatment (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 artificially aged without cold working (straightening and straightening can be carried out without affecting the mechanical property limit).
T6
Artificial aging state after solution heat treatment.
Suitable for products without cold working after solution heat treatment (straightening and straightening can be carried out without affecting the limit of mechanical properties).
T7
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 of artificial aging after solution heat treatment.
Suitable for cold working, straightening and straightening to improve the strength of products.
T9
Artificial aging state of cold working after solution heat treatment.
Suitable for products that have been cold-worked to improve product strength.
T 10
The state of cooling, cold working and artificial aging through 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 relief state)
Adding an Arabic numeral (called TXX status) or two Arabic numerals (called TXXX status) after the TX status code indicates the status after a specific process that obviously changes the product characteristics (such as mechanical properties, corrosion resistance, etc.). ).
T42
It is suitable for products that reach a completely stable state after O or F state solution heat treatment, and also suitable for products whose mechanical properties reach T42 state after heat treatment of processed products in any state by the demander.
T62
It 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
It is suitable for products with specified mechanical properties and stress corrosion resistance after solution heat treatment and aging.
T74
Same as T73 state definition. The tensile strength of this state is greater than that of T73 state, but less than that of T76 state.
T76
Same as T73 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
It 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
It is suitable for products with strength improved by cold working deformation of about 1% after solution heat treatment and then artificially aged.
T87
It 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.
TX5 1
TXX5 1
TXXX5 1
It is suitable for drawing thick plates, rolled or cold-worked bars, die forgings, forging rings or rolling rings according to the specified amount after cooling in solution heat treatment or high temperature forming process. These products will not straighten after stretching.
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%.
TX5 10
TXX5 10
TXXX5 10
It is suitable for extruded bars, dies and pipes, and drawn pipes cooled by solution heat treatment or high temperature forming process. These products will not be straightened after drawing.
The permanent deformation of extruded bars, dies and pipes is1%~ 3%; The permanent deformation of the drawn tube is 65438 0.5% ~ 3%.
TX5 1 1
TXX5 1 1
TXXX5 1 1
It is suitable for extruding bars, dies and pipes, and also suitable for drawing pipes, which are stretched by a specified amount after solution heat treatment or cooling from high temperature forming process. These products can be slightly straightened after stretching to reach the standard tolerance.
The permanent deformation of extruded bars, dies and pipes is1%~ 3%; The permanent deformation of the drawn tube is 65438 0.5% ~ 3%.
TX52
TXX52
TXXX52
It is suitable for solution heat treatment or cooling in high temperature forming process, and the product with permanent deformation of 1% ~ 5% can be produced by eliminating stress through compression.
TX54
TXX54
TXXX54
It is suitable for die forgings, and the stress is relieved by cold forming in the final forging die.
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.
T6 1, never seen it.