Reference guide

Continuous cast

Aluminum bronze, such as C95300, is the highest strength standard copper-based alloy. Concast produces C95400, C95500, AMS 4880-C95510, and C95900 aluminum bronze alloys as Standard-stocked products in common sizes of rounds, tubes, and rectangles. Aluminum in conjunction with iron and nickel acts as a strengthener in these alloys including C953. All of the aluminum bronzes can be heat treated, further increasing tensile strengths.


Product description: Aluminum bronze
Solids: 1/2" to 9" O.D.
Tubes: 1 1/8" to 9" O.D.*
Rectangles: Up to 15"
Standard lengths: 144"
Shape/Form: semi-finished, mill stock or near-net shapes, anode, bar stock, billet/bloom, squares, hex, plate, profile or structural shape, flats/rectangular bar

 *Consult mill for wall thickness

Typical uses

Electrical: connectors
Fasteners: stripped nuts
Industrial: bearing segment for the steel industry, cams, gears, high-strength clamps, high-temperature applications, large hold-down screws, mining machine parts, pickling baskets, pickling hooks, pressure blocks for the steel industry, valve bodies, welding jaws
Marine: covers for marine hardware, marine equipment

Note: Also available in heat-treated condition.

Similar or equivalent specification

CDA ASTM SAE AMS Federal Military Other
C95300 B505
  QQ-C-390, G7;
QQ-B-671, Class 2
MIL-B-16033, Class 2 Aluminum bronze 9B

Chemical composition

Cu% Fe% Al%
Chemical composition according to ASTM B505/B505M-23

Note: Cu + sum of named elements, 99.0% min. Unless otherwise noted, single values represent maximums.


Copper alloy UNS No. Machinability rating Density (lb/in3 at 68 °F)
C95300 55 0.272

Mechanical properties

Mechanical properties according to ASTM B505/B505M-23
Tensile strength, min Yield strength, at 0.5% extension under load, min Elongation, in 2 in. or 50 mm min Brinell hardness (3000 kg load) Remarks
ksi MPa ksi MPa % typical BHN  
70 483 26 179 25 125  

Physical properties

  US Customary Metric
Physical properties provided by CDA

*Field strength 8 kA/m
Melting point - liquidus 1913 °F 1045 °C
Melting point - solidus 1904 °F 1040 °C
Density 0.272 lb/in3 at 68 °F 7.53 gm/cm3 at 20 °C
Specific gravity 7.53 7.53
Electrical conductivity 13% IACS at 68 °F 0.075 MegaSiemens/cm at 20 °C
Thermal conductivity 36.3 Btu · ft/(hr · ft2·°F) at 68 °F 62.8 W/m at 20 °C
Coefficient of thermal expansion 68-572 9 · 10-6 per °F (68-572 °F) 15.5 · 10-6 per °C (20-200 °C)
Specific heat capacity 0.09 Btu/lb/°F at 68 °F 377.1 J/kg at 20 °C
Modulus of elasticity in tension 16000 ksi 110000 MPa
Magnetic Permeability* 1.07 1.07

Fabrication properties

Fabrication properties provided by CDA
Technique Suitability
Soldering Good
Brazing Good
Oxyacetylene welding Not recommended
Gas shielded arc welding Excellent
Coated metal arc welding Good
Machinability rating 55

Thermal properties

Thermal properties provided by CDA
*Temperature is measured in fahrenheit.   **For stress relief, solution treatment and annealing - time is measured in hours/inch of thickness. For precipitation heat treatment - time is measured in hours.
Treatment Min* Max* Value* Time** Medium
Stress relief     600    
Solution treatment 1585 1635   1 Water
Annealing 1150 1225   1  

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