UNS/CDA
C62400 Aluminum Bronze,11%
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Specifications
AWS A5.7 Class
ERCuAl-A3
Description
Aluminum Bronze A-3 contains a higher Iron (Fe) content
than Aluminum Bronze A-2. The higher Iron content gives
A-3 greater strength when joining aluminum bronze castings
of similar composition. A-3 is often used for piston
overlay and bearing surface applications which require
higher strength, while maintaining good ductility.
Chemical Composition
(%max., unless shown as range or min.)
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Cu(1)
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Al
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Fe
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Mn
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Si
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Sn
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Min./Max.
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Rem.
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10.0-11.5
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2.0-4.5
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.30
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.25
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.20
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Nominal
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86.0
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11.0
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3.0
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-
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-
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-
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(1) Cu value includes Ag. Note: Cu + Sum of
Named Elements, 99.5% min.
Applicable Specifications
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Product
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Specification
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Forgings
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SAE J461, J463
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Rod
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ASTM B150
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Rod, Welding
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AWS A5.7
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Common Fabrication
Processes Hot bending, Hot forging
Fabrication Properties
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Joining Technique
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Suitability
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Soldering
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Not Recommended
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Brazing
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Fair
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Oxyacetylene Welding
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Not Recommended
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Gas Shielded Arc Welding
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Good
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Coated Metal Arc Welding
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Good
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Spot Weld
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Good
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Seam Weld
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Good
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Butt Weld
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Good
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Capacity for Being Cold Worked
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Poor
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Capacity for Being Hot Formed
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Excellent
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Forgeability Rating
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80
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Machinability Rating
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50
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Physical Properties
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US Customary
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Metric
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Melting Point - Liquidus
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1900 F
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1038 C
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Melting Point - Solidus
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1880 F
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1027 C
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Density
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0.269 lb/in3
at 68 F
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7.45 gm/cm3
@ 20 C
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Specific Gravity
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7.45
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7.45
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Electrical Resistivity
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86.4 ohms-cmil/ft @ 68 F
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14.36 microhm-cm @ 20 C
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Electrical Conductivity
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12 %IACS @ 68 F
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0.07 MegaSiemens/cm @ 20 C
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Thermal Conductivity
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34.0 Btu · ft/(hr· ft2·oF)
at 68F
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58.8 W/m · o
K at 20 C
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Coefficient of Thermal
Expansion
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9.0 ·10-6
per o
F (68-572 F)
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16.2 ·10-6
per o
C (20-300 C)
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Specific Heat Capacity
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0.09 Btu/lb/o
F at 68 F
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377.1 J/kg · o
K at 293 K
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Modulas of Elasticity
in Tension
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17000 ksi
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117000 MPa
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Modulus of Rigidity
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6400 ksi
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44130 MPa
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Typical Uses
Fasteners Nuts Industrial
Hydraulic Bushings, Support Bushings, Valve Balls, Welding
Wire, Tie Rods, Wear Plates, Drift Pins, Bushings, Gears,
Cams
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