[China Aluminum Industry Network] 1. Scope This standard specifies the state code for deformed aluminum alloys.
This standard applies to aluminum and aluminum processing products.
2. Basic Principles 2.1 The basic state code is represented by a capital letter.
2.2 The subdivision state code uses the basic state code followed by one or more Arabic numerals.
2.3 Basic status codes Table 1 Basic status is divided into 5 types of codes Name Description and application F Free machining status Applicable to the products that have special requirements for work hardening and heat treatment conditions in the molding process, the mechanical properties of the status products are not specified.
The O-annealing state is suitable for fully annealed to obtain a lower strength processed product.
H Work-hardening conditions are applicable to products that are hardened by work hardening, and the product may be heat-treated (without passing) to reduce the strength after work-hardening.
W Solid-Solid 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 its natural ageing stage.
T heat treatment conditions (different from F, O, H conditions) are applicable to heat-treated products that have been or have not been hardened to a stable product. The T code must be followed by one or more Arabic numerals.
3. Subdivision state code 3.1H subdivision state Add two digits of Arabic numerals (called HXX state) or three Arabic numerals (called HXXX state) to H after the letter H.
The subdivision state.
3.1.1 HXX State 3.1.1.1
The first digit after H represents the basic handler for this state, as shown below:
H1—Simple work hardening treatment state. Applicable to the condition that the required strength is obtained only after work hardening without additional heat treatment. H2 - Work-hardened and incompletely annealed state. It is applicable to products whose work hardening degree exceeds the requirements of the finished product, and after incomplete annealing, reduces the strength to the specified index. For natural aged alloys softened at room temperature, H2 has the same lower ultimate tensile strength as the corresponding H3; for other alloys, H2 has the same lower ultimate tensile strength as the corresponding H1, but the elongation ratio is H1. Slightly higher. H3—The state of work hardening and stabilization treatment. It is suitable for products whose mechanical properties have been stabilized after heat treatment or heat treatment during processing. The H3 state is only applicable to alloys that gradually soften (until stabilised) at room temperature. H4—The state of work hardening and painting. Applicable to work-hardening, paint treatment leads to incompletely annealed products.
3.1.1.2
The second digit after H indicates the degree of work hardening of the product. The number 8 indicates a hard state. The smaller tensile strength of HX8 is normally specified by the sum of the smaller tensile strength of the O-state and the strength difference specified in Table 2. For the states between O (annealing) and HX8 states, the numbers from 1 to 7 should be added after the HX code, respectively. The addition of the number 9 after HX indicates a superhard state with a greater degree of work hardening than HX8. The HXX subdivision status code and the corresponding degree of work hardening are shown in Table 3:
Table 2 The difference of the smaller tensile strength between the HX8 state and the O state The smaller the tensile strength of the O state/The smaller the tensile strength difference between the MpaHX8 state and the O state/Mpa
≤4055
45 to 6065
65～8075
85～10085
105～12090
125～16095
165～200100
205~240105
245～280110
285~320115
≥ 325120
Table 3 HXY subdivision state code and work hardening degree subdivision state code work hardening degree HX1
Tensile strength limit is the middle value of O and HX2 state HX2
Tensile strength limit is the middle value of O and HX4 state HX3
Tensile strength limit is HX2 and HX4 state median HX4
Tensile strength limit is intermediate value of H and HX8 state HX5
Tensile strength limit is the median of HX4 and HX6 states HX6
Tensile strength limit is HX7 and HX8 state median HX7
Tensile strength limit is HX8 and HX8 state median HX8
Hard state HX9
Superhard state Small tensile strength limit Super HX8 state at least 10Mpa
Note: When the tensile strength values ​​of the HX1~HX9 states are determined according to the above table, they do not end with 0 or 5. It should be rounded up to the next larger value ending in 0 or 5.
3.1.2 HXXX Status The HXXX status code is as follows:
a) H111
Applicable to finish-annealing after appropriate amount of work hardening, but the degree of work hardening is not as good as H11.
b) H112
Suitable for hot forming products. The state of the product's mechanical properties have regulatory requirements.
c) H116
Suitable for products made of 5XXX series alloys with magnesium content ≥ 4.0%. These products have specified mechanical properties and anti-stripping corrosion performance requirements.
d) The state code of the diamond plate The state code of the diamond plate and its corresponding plate state code before embossing are shown in Table 4:
Table 4 Pattern plates and their status before embossing Status code Check the state of the diamond plate Code before the state of the plate Embossed H114
O
H124
H11
H224
H21
H324H31
H134
H12
H234
H22
H334H32
H144
H13
H244
H23
H344H33
H154
H14
H254
H24
H354H34
H164
H15
H264H25
H364H35
H174
H16
H274H26
H374H36
H184
H17
H284
H27
H384H37
H194
H18
H294
H28
H394H38
H195H19
H295H29
H395H39
3.2
The subdivision of T adds one or more digits to the back of the letter T to indicate the subdivision of T.
3.2.1 TX State Adding 0 to 10 Arabic numerals after T indicates that the subdivided state (called TX state) is shown in Table 5. The number following T indicates the teacup processing program for the product.
Table 5 TX subdivision status code description and application status code description and application T0
After solution heat treatment, natural aging and then through the state of cold processing. Suitable for products that have been cold processed to increase strength.
T1
Cooled by the high-temperature molding process and then naturally aged to a substantially stable state. It is applicable to products that are not cold-processed after being cooled by the high-temperature forming process (straightening and straightening can be performed but the mechanical performance limit is not affected).
T2
Cooled by high-temperature molding process, natural aging after the cold processing to a basically stable state. Applicable to products that are cold-processed, straightened, or straightened to increase strength after the high-temperature molding process.
T3
After the solution heat treatment, it is cold-processed, and then it is naturally aged to a basically stable state. Applicable to products that undergo cold processing, straightening and leveling to increase strength after solution heat treatment.
T4
After the solution heat treatment, it is naturally aged to a basically stable state. It is applicable to products that are not subjected to cold processing after solution heat treatment (possible straightening and straightening, but without affecting the mechanical performance limit).
T5
It is cooled by a high temperature molding process and then artificially aged. It is suitable for artificial aging products after it is cooled by the high-temperature molding process without cold working (straightening and straightening can be performed without affecting the mechanical performance limit).
T6
The state of artificial aging after solution heat treatment. Applicable to products that are no longer cold-processed after solution heat treatment (straightening, straightening, but not mechanical limit).
T7
The state of artificial aging after solution heat treatment. Applicable to the product after the solution heat treatment, in order to obtain some important characteristics, in the artificial aging, the strength in the aging curve over the higher peak.
T8 solution heat treatment after cold processing, and then artificial aging state. Applicable to cold production, or straightening, leveling to improve product strength production.
T9 solution heat treatment artificial aging, and then cold processing state. Applicable to products that have been cold processed to increase product strength.
T10
After being cooled by a high temperature molding process, cold working is performed and then artificial aging is performed. Applicable to products that have been cold-processed, straightened, or leveled to increase product strength.
Note: Some 6xxx alloys, whether solution heat treatment in the furnace 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. These alloys T3, T4, T6, The T7, T8, and T9 states can use any of the above two processing methods.
3.2.2
T state and TXXX state (outside stress state)
Adding an Arabic number (called the TXX state) or adding two digits (called the TXXX state) after the TX state code indicates that the specific characteristics of the product (such as mechanical properties, corrosion resistance, etc.) have been changed. The state of the process, as shown in Table 6.
Table 6 TXX and TXXX Subdivision Status Code Description and Application Status Code Description and Application T42
Applicable to products that have undergone solid solution heat treatment in the O or F state and have reached a sufficiently stable state of natural aging, and are also applicable to products whose mechanical properties have reached the T42 state after heat treatment of the processed products in any state.
T62
Applicable to products that enter into artificial aging after solution heat treatment from O or F state, also applicable to products whose mechanical properties have reached T62 state after heat treatment of processed products in any state.
T73
Applicable to the solution heat treatment, after aging to achieve the required mechanical properties and stress corrosion resistance of the product.
T74
Same as the T73 state definition. The tensile strength in 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, and the stress corrosion cracking resistance is lower than that of T73 and T74, respectively, but its anti-stripping corrosion performance is still good.
T7X2
It is suitable for products that have undergone artificial aging treatment and have mechanical properties and corrosion resistance that have reached the T7X state after solution heat treatment in the O or F state.
T81
Suitable for solution heat treatment, after about 1% cold deformation to increase strength, and then artificial aging products.
T87
Applicable to solution heat treatment, after about 7% cold deformation to improve the strength, and then artificial aging products.
3.2.3
Stress relief states Adding "51", or "510", or "511" or "52" or "54" after the above TX or TXX or TXXX status code indicates that the product has undergone stress relief processing, as shown in Table 7. Show.
Table 7 Stress Relief Status Code Description and Application State Code Description and Application TX51
Suitable for solution heat treatment or cooling from the high-temperature forming process, after the specified amount of stretching plate, rolled or cold-finished bars and forgings, forging ring or rolling ring, these products are no longer stretched Straighten. Longer deformation of thick plate is 1.5%~3%; Longer deformation of rolled or cold finished bar is 1%~3%; Longer deformation of forging ring or rolling ring of forging is 1% ~5%.
TXX51
TXXX51
TX510
Suitable for solution heat treatment or cooling from the high-temperature molding process. Extruded rods, types and tubes, as well as drawn tubes, are extruded in specified amounts. These products are not straightened after stretching. The longer deformation of the extruded rod, type and tube is 1%~3%; the longer deformation of the drawn tube is 1.5%~3%.
TXX510
TXXX510
TX511
Suitable for solution heat treatment or cooling from the high-temperature molding process. Extruded rods, types, and tubes, as well as drawn tubes, are extruded in specified amounts. These products can be slightly straightened after stretching to meet standard tolerances. The longer deformation of the extruded rod, type and tube is 1%~3%; the longer deformation of the drawn tube is 1.5%~3%.
TXX511
TXXX511
TX52
It is suitable for solution heat treatment or cooling from the high temperature molding process, and eliminates the stress by compression to produce 1%~5% of the products with longer deformation.
TXX52
TXXX52
TX54
Suitable for die forgings that eliminate stress through cold forming in the final forging die.
TXX54
TXXX54
4.3
The stress relief state of W is just like the stress relief state code representation method of T. The same number (51, 52, 54) can be added after the W state code to represent the unstable solution heat treatment and stress relief state.
Appendix A
(Appendix of tips)
The original status code The corresponding new code The old code The new code The old code The new code M
O
CYSTX51, TX52, etc. R
H112 or F
CZYT0
Y
HX8
CSYT9
Y1
HX6
MCST62
Y2
HX4
MCZ
T42
Y4
HX2
CGS1T73
T
HX9CGS2T76
CZ
T4CGS3
T74
CS
T6
RCST5
Note: The products originally delivered in state R, which provide the performance of CZ and CS samples, may correspond to the new code T62 and T42, respectively.
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