1. Chemical composition of EN AW-7020
in the aftermath of DIN EN 573-3 (in % of the mass, rest AL)
Si |
Fe |
Cu |
Mn |
Mg |
Cr |
Zn |
Ti |
Remark |
Other elements |
0,35 |
0,4 |
0,2 |
0,05-0,5 |
1,0-1,4 |
0,1-0,35 |
4,0-5,0 |
- |
Ti+Zr 0,08-0,25 |
0,15 |
2. mechanical properties of EN AW-7020
in the aftermath of DIN EN 485-2 Sheets and plates (common conditions)
Condition |
Nominal thickness |
Tensile strength |
Plug-in limit |
Ultimate elongation |
Rigor |
|
in mm |
Rm in MPa |
Rp0,2 in MPa |
in % (min.) |
HBS |
|
over |
up to |
min |
max |
min |
max |
A50 |
A |
|
T62 |
3,0 |
6,0 |
350 |
- |
280 |
- |
10 |
- |
104 |
T651 |
6,0 |
12,5 |
350 |
- |
280 |
- |
|
9 |
104 |
|
40,0 |
100,0 |
340 |
- |
270 |
- |
- |
8 |
101 |
Physical properties |
General properties |
(Guide values for 20° C) |
|
Density of g/cm3 |
2,77 |
Resistance to: |
|
Solidification range ° C |
600-650 |
- Sea water |
4 |
Electrical conductivity MS/m |
19-23 |
- Weather conditions |
3 |
Thermal conductivity W/(mK) |
130-160 |
Hot formability |
|
Therm. linear expansion- |
|
- extrusion presses |
2 |
Coeffizient 10-6/K |
23,1 |
- Drop forging |
2 |
Modulus of elasticity N/mm2 |
70.000 |
- Open die forging |
2 |
Weldability |
|
Surface treatment |
|
Fusion welding |
|
Protection anodizing |
2 |
- Gas |
3 |
Anodizing (decorative) |
3 |
- WIG |
2 |
Painting/Coating |
2 |
- MIG |
1 |
|
|
Resistance welding |
6 |
Contact with food |
no |
|
- |
|
|
Machinability T651
|
2 |
|
|
3. Main application / Special features of EN AW-7020:
Profiles and tubes for welded structures and supporting structures, welded structures with high required tensile strength. Hardens independently after fusion welding.