|
KAISER ALUMINUM
TECHNICAL REFERENCE LIBRARY No. 1017
| Technical Data - ALLOY 7068 |
Call 1-800-USE-2011 |
| Chemical Composition
Limits |
Others |
| Weight % |
Si |
Fe |
Cu |
Mn |
Mg |
Cr |
Zn |
Ti |
Zr |
Each |
Total |
| Minimum |
- |
- |
1.6 |
- |
2.2 |
- |
7.3 |
- |
0.05 |
- |
- |
| Maximum |
0.12 |
0.15 |
2.4 |
0.10 |
3.0 |
0.05 |
8.3 |
0.10 |
0.15 |
0.05 |
0.15 |
| Typical
Physical Properties |
| Characteristic |
English |
Metric |
| Nominal
Density (68 °F/20 °C) |
0.103
lbs./in.3 |
2.85 Mg/m3 |
| Melting
Range |
890 °F -
1175 °F |
476 °C -
635 °C |
| Specific
Heat (212 °F/100 °C) |
0.25
BTU/lb. - °F |
1050
J/kg - °K |
| Coefficient of Thermal Expansion |
|
13.0
micro in./in. - °F |
23.4
micro m/m - °K |
|
|
3.78
x 10-5 in.3/in.3 - °F |
68
x 10-6 m3/m3 - °K |
| Thermal
Conductivity (68°F/20°C) |
T6, T6511 |
110
BTU/ft. - hr. - °F |
190
W/m - °K |
| Electrical Conductivity (68°F/20°C) |
Equal
Volume |
T6, T6511 |
31% IACS |
| T76,
T76511 |
39% IACS |
| Electrical
Resistivity (68°F/20°C) |
T6, T6511 |
|
49.4
micro ohm meter |
| Typical Mechanical Properties |
| |
Tensile
(.500" Dia. Specimen) |
Hardness |
Shear |
Fracture
Toughness |
| Temper |
Yield |
Ultimate |
Elongation/4D |
|
Ultimate
Shearing Strength |
ksi
Öin. |
| KSI |
MPa |
KSI |
MPa |
% |
|
KSI |
MPa |
L-T |
T-L |
| T6,T6511 |
99 |
683 |
103 |
710 |
9 |
190 |
53 |
365 |
25 |
15 |
| T6, T651 |
94 |
648 |
100 |
698 |
9 |
185 |
- |
- |
- |
- |
| T76, T76511 |
83 |
572 |
89 |
614 |
9 |
170 |
- |
- |
- |
- |
| Comparative Characteristics |
| Temper |
Corrosion
Resistance |
|
|
|
|
Weldability4 |
| General1 |
Stress2 |
Gas |
Arc |
Spot |
| T6,T6511 |
C |
C |
D |
C |
B |
D |
D |
D |
B |
| T76, T76511 |
C |
B |
D |
C |
B |
D |
D |
D |
B |
| 1 Ratings A through E are relative
ratings in decreasing order of merit, based on exposures to sodium chloride solution by
intermittent spraying or immersion. Alloys with A and B ratings can be used in industrial
and seacoast atmospheres without protection. Alloys with C, D and E ratings generally
should be protected at least on faying surfaces. |
| 2 Stress-corrosion cracking ratings
are based on service experience and laboratory tests of specimens exposed to the 3.5%
sodium chloride alternate immersion test. |
| A= |
No known instance of failure in service or in
laboratory tests. |
| B= |
No known instance of failure in service;
limited failures in laboratory tests of short transverse specimens. |
| C= |
Service failures with sustained tension
stress acting in short transverse direction relative to grain structure; limited failures
in laboratory tests of long transverse specimens. |
| D= |
Limited service failures with sustained
longitudinal or long transverse |
|
|
| 3 Ratings A through D for Workability
(cold), A through E for Machinability and A through C for Anodize Response, are relative
ratings in decreasing order of merit. |
| 4 Ratings A through D for Weldability
and Brazeability are relative ratings defined as follows: |
| A= |
Generally weldable by all commercial
procedures and methods. |
| B= |
Weldable with special techniques or for
specific applications that justify preliminary trails or testing to develop welding
procedure and weld performance. |
| C= |
Limited weldability because of crack
sensitivity or loss in resistance to corrosion and mechanical properties. |
| D= |
No commonly used welding methods have been
developed. |
|
|
