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UNS C83600 (Alloy 4A, SAE 40) Ounce Metal

C83600 ounce metal is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 40 is the SAE designation for this material. C83600 is the UNS number. Additionally, the EN chemical designation is CuZn5P5Pb5. And the common industry name is 85-5-5-5. Older literature may refer to this material as ASTM Alloy 4A, but this is now discouraged.

It has a fairly high electrical conductivity among cast bronzes. In addition, it has a moderately high thermal conductivity and a moderately low embodied energy.

The graph bars on the material properties cards below compare C83600 ounce metal to: cast bronzes (top), all copper alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

110 GPa 15 x 106 psi

Elongation at Break

21 %

Poisson's Ratio

0.34

Shear Modulus

39 GPa 5.7 x 106 psi

Tensile Strength: Ultimate (UTS)

250 MPa 36 x 103 psi

Tensile Strength: Yield (Proof)

120 MPa 18 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 320 °F

Melting Completion (Liquidus)

1010 °C 1850 °F

Melting Onset (Solidus)

850 °C 1570 °F

Specific Heat Capacity

370 J/kg-K 0.088 BTU/lb-°F

Thermal Conductivity

72 W/m-K 42 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

15 % IACS

Electrical Conductivity: Equal Weight (Specific)

15 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative

Density

8.8 g/cm3 550 lb/ft3

Embodied Carbon

3.1 kg CO2/kg material

Embodied Energy

50 MJ/kg 21 x 103 BTU/lb

Embodied Water

350 L/kg 42 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

43 MJ/m3

Resilience: Unit (Modulus of Resilience)

70 kJ/m3

Stiffness to Weight: Axial

6.7 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

7.9 points

Strength to Weight: Bending

10 points

Thermal Diffusivity

22 mm2/s

Thermal Shock Resistance

9.3 points

Alloy Composition

Among cast copper alloys, the composition of C83600 ounce metal is notable for containing a comparatively high amount of lead (Pb) and including sulfur (S). Lead is used to improve machinability and bearing properties, at the cost of toxicity. It also adds pressure tightness to castings. Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity.

Copper (Cu) 84 to 86
Tin (Sn) 4.0 to 6.0
Lead (Pb) 4.0 to 6.0
Zinc (Zn) 4.0 to 6.0
Phosphorus (P) 0 to 1.5
Nickel (Ni) 0 to 1.0
Iron (Fe) 0 to 0.3
Antimony (Sb) 0 to 0.25
Sulfur (S) 0 to 0.080
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050
Residuals 0 to 0.7

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B62: Standard Specification for Composition Bronze or Ounce Metal Castings

ASTM B271: Standard Specification for Copper-Base Alloy Centrifugal Castings

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001