Alloy 7049

Chemical Composition Limits Others
Weight % Si Fe Cu Mn Mg Cr Zn Ti Each Total
Minimum - - 1.2 - 2.0 0.10 7.2 - - -
Maximum  
7049 0.25 0.35 1.90 0.20 2.9 0.22 8.2 0.10 0.05 0.15
7149 0.15 0.20 - - - - - - - -

Typical Physical Properties
Characteristic English Metric
Nominal Density (68 °F/20 °C) 0.103 lbs./in.3 2.84 Mg/m3
Melting Range  890 °F - 1175 °F 476 °C - 635 °C
Specific Heat (212 °F/100 °C) 0.23 BTU/lb. - °F 960 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 10-5in.3/in.3 -°F 68 x 10-6m3/m3 -°K
Thermal Conductivity (68°F/20°C) T6,T651 75 BTU/ft. - hr. - °F 130 W/m - °K
T7, T7351 89 BTU/ft. - hr. - °F 154 W/m - °K
Electrical Conductivity (68°F/20°C) Equal Volume T6,T651 33% IACS
T7, T7351 38% IACS
Equal Weight T6,T651 105% IACS
T7, T7351 -

Typical Mechanical Properties (Longitudinal)
  Tensile (.500" Dia. Specimen) Hardness Shear Fatigue Modulus
Temper Yield Ultimate Elongation/4D
Brinell
500 kg
10 mm
Ultimate Shearing Strength Endurance Limit - R.R. Moore Type Modulus of Elasticity
KSI MPa KSI MPa %   KSI MPa KSI MPa KSI x 103 Gpa
T6, T6511 86 592 94 648 5 170 - - - - 10.5 72.5
T74, T74511 77 530 85 586 7 160 43 296 -   10.5 72.5
T76, T76511 70 483 78 538 7 150 45 310 -   10.5 72.5
T73, T73511 64 411 74 510 7 140 40 276 43* 295* 10.5 72.5

*In 10E7 cycles, axially loaded specimens tested at R = 0.1
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
T73, T73511 C B D B B D D D B
T74, T74511
T76, T76511
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.
Applicable Specifications  
Cold Finished Extruded
  AMS 4157
  AMS 4159

 
 
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