Aluminum Zinc Alloy
PLATE 7021 REC.
Available formats: Sheet metal, plates, bars, tubes and profiles.
Heat treated, tempered and artificially matured T79.
Typical applications and uses
The rectified Zinc 7021 Alloy Aluminum plate is especially recommended for the following applications: Resin transfer molding, Compression molding, Resin injection molding, Blow molding, Thermoforming.
The main alloy addition is zinc and is formulated for primary formation in forged products. Not recommended for complex shapes and sharp corners. For these applications, we recommend the use of laminated products whenever possible.
Heat treatments:
Milled / ground surface finish
Thickness tolerance ± 0.1 mm
Plastic protection on both sides
Very low internal tensions. Good shape stability and good homogeneity. High resistance Short chip alloy with very high strength. Less stress than other tooling alloys. This alloy has a moderate resistance to corrosion and is suitable for welding.
Chemical composition
|
%
|
Si
|
Fe
|
Cu
|
Mn
|
Mg
|
Cr
|
Zn
|
Ti
|
Bi
|
Zr
|
Others
|
Al
|
|
Min. |
- |
- |
- |
- |
1,2 |
- |
5 |
- |
- |
0,08 |
- |
- |
|
Max. |
0,25 |
0,4 |
0,25 |
0,1 |
1,8 |
0,05 |
6 |
0,1 |
- |
0,18 |
0,15 |
Rest |
Chemical composition
|
Element
|
Min.%
|
Max. %
|
|
Si Fe Cu Mn Mg Cr Zn Ti Bi Zr Others Al |
- - - - 1,2 - 5 - - 0,08 - - |
0,25 0,4 0,25 0,1 1,8 0,05 6 0,1 - 0,18 0,15 Rest |
Physical Properties in State T79
|
Module
Elastic N / mm² |
Weight
specific gms / cm³ |
Temperature
of fusion in ° C |
Coefficient of
linear dilation ? m / mK |
Conductivity
thermal W / mK |
Resistivity
electric ?? m |
Conductivity
electric % IACS |
Potential of
dissolution V |
|
70.000 |
2,8 |
510 - 630 |
23 |
125-155 |
38-52 |
21-24 |
-0,81 |
Physical Properties in State T79
| Elastic module N / mm² |
70.000 |
|---|---|
| Specific weight gms / cm³ |
2,8 |
| Melting temperature in ° C |
510 - 630 |
| Linear expansion coefficient ? m / mK |
23 |
| Thermal conductivity W / mK |
125-155 |
| Electrical resistivity ?? m |
38-52 |
| Electric conductivity % IACS |
21-24 |
| Dissolution potential V |
-0,81 |
Mechanical Characteristics
| State | Breaking load Rm (Mpa) |
Elastic limit Rp0.2 (MPa) |
Elongation min % |
Hardness * ª HB |
||
|---|---|---|---|---|---|---|
| min. | max. | min. | max. | 50 mm | ||
|
T79 |
320 |
380 |
290 |
340 |
2.5 - 4.5 |
110 - 120 |
* ª For information only.
Mechanical Characteristics
| State | T79 |
|---|---|
| Breaking load Rm (Mpa) | Min. | 320 |
| Breaking load Rm (Mpa) | Max. | 380 |
| Elastic Limit Rp0.2 (MPa) | Min. | 290 |
| Elastic Limit Rp0.2 (MPa) | Max. | 340 |
| Elongation min % | 50 mm | 2.5 - 4.5 |
| Hardness * HB | 110 - 120 |
* ª For information only.
Technological skills (MB Very Good | B Good | C Correct | R Regular | M Bad)
WELDING
- To the flame (B)
- Al arc under argon gas (M)
- By electrical resistance (M)
- Braised (B)
ANODIZED
- Protective (B)
- Decorative (M)
- Hard anodized (B)
MECHANIZATION
- Chip Fragmentation (MB)
- Surface brightness (MB)
REPUJADO
- In state: O (-)
NATURAL BEHAVIOR
- In rural environment (R)
- In industrial environment (R)
- In marine environment (R)
- In seawater (R)
COVERING
- Lacquered (B)
- Galvanized (B)
- Chemical nickel (B)
EMBUTITION
- By expansion (M)
- Deep drawing (R)
FOOD
- Food use (M)
Formats
Aluminum Plates Zinc Alloy 7021 Rectified.
Heat treated, tempered and artificially matured T79.
Milled surface precision, roughness Ra 0.4 µm, protected with plastic on both sides.
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