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Alloy Specifications, Chemistries, and Technical Data

771.0 Aluminum
Aliases
ANSI AA NUMBER 771.0
Common Name Precedent 71A
UNS Designation A07710
Alias 71A
Alias Precedent
Nearest Applicable Casting Standards
ASTM (B Series) B26
Federal (QQ-C- Series) 601e
Military (Mil-C- Series) 21180c
Specification Composition
Minimum Maximum
Silicon (Si) 0.15
Iron (Fe) 0.15
Copper (Cu) 0.1
Manganese (Mn) 0.1
Magnesium (Mg) 0.8 1
Chromium (Cr) 0.06 0.2
Zinc (Zn) 6.5 7.5
Titanium (Ti) 0.1 0.2
Other (Total) 0.5
Specification Properties
(Heat Treat 'F' Denotes As Cast) Heat Treat State Minimum
Tensile Strength (ksi) 0 40
Yield Strength (.5% extension under load) (ksi) 0 30
Elongation (2 inch gauge length) (%) 0 3
Tensile Strength (ksi) F 43
Yield Strength (.5% extension under load) (ksi) F 34
Elongation (2 inch gauge length) (%) F 4
Tensile Strength (ksi) T6 50
Yield Strength (.5% extension under load) (ksi) T6 40
Elongation (2 inch gauge length) (%) T6 9
Tensile Strength (ksi) T71 52
Yield Strength (.5% extension under load) (ksi) T71 48
Elongation (2 inch gauge length) (%) T71 3
Typical Properties
Heat Treat State Typical
Endurance Limit (K ksi) 10
Modulus of Elasticity (K ksi) 10.3
Density (lb/cu.in. @ 68F) .102
Electrical Conductivity (% IACS @ 68F) 37
Thermal Conductivity (cal/sec/sq cm/cm/C @ 25C) 0.33
Coefficient of Thermal Expansion (per F @ 68-212F) 13.7
Coefficient of Thermal Expansion (per F @ 68-572F) 14.8
Melting Range (Liquidus-Solidus)(F) 1120-1190
Resistance to Hot Cracking F
Pressure Tightness F
Fluidity VG
Solidification Shrinkage Tendency F
Strength at Elevated Temperatures F
Corrosion Resistance E
Machinability E
Polishing E
Gas Welding F
Arc Welding G
Brazing Yes
Normally Heat Treated Yes
Annodizing Appearance Satin White, Pastels
Hardness (Brinell) (HB @ 500kg) 0 85
Hardness (Brinell) (HB @ 500kg) F 85
Hardness (Brinell) (HB @ 500kg) T6 90
Compressive Yield Strength (ksi) T71 54
Hardness (Brinell) (HB @ 500kg) T71 120
Comments
Aging: Self age in 21-30 days, and continues to slowly age for a full year.
Applications
Decorative Castings
Experimental Alloy
Farm Machinery
Impeller
Large Intricate Castings
Machine Tool Parts
Marine Castings
Pump Head
Suction Adapter
Volute
Great Castings
         St. Paul Foundry 954 Minnehaha Ave West St. Paul MN 55104 651-488-5567 www.stpaulfoundry.com
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Alloy Guide Sheet Terms of Use

Use Good Design Principles

1. St. Paul Foundry is providing this information on metal characteristics for informational purposes only. Before making a final decision on alloy selection consider the following and all other appropriate design and specification principles. Please note that this is not an exhaustive list.

2. Consult the appropriate specification from an accredited specifying body (ASTM, SAE, Federal or Military) to determine current minimum values of this alloy.

3. Use appropriate design safety factors.

4. Use Failure Modes and Effects Analysis to help identify possible weaknesses in designs and specifications.

5. Use computerized stress analysis tools.

6. Use appropriate certification requirements for your casting suppliers. These may include test bars, chemical certifications, radiography, dye penetrant or other non-destructive testing methods.

7. Test your design to failure in a controlled environment. Then test it to failure in a simulation of its end use.

8. You and you alone are responsible for the suitability of your design and the materials that you select.

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