Alloy 7068

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
Linear
68 °F-212 °F
20 °C-100 °C
13.0 micro in./in. - °F 23.4 micro m/m - °K
Volumetric
68 °F/20 °C
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
Brinell
500kg
10mm
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
Cold
Workability3
Machin-
ability3
Anodize
Response3
Braze-
ability4
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.

 
 
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