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UNS C61300 (ERCuAl-A2) Aluminum Bronze

C61300 bronze is a bronze formulated for primary forming into wrought products. ERCuAl-A2 is the AWS designation for this material. C61300 is the UNS number. It has a moderately high melting temperature and can have a moderately high ductility among wrought bronzes.

The properties of C61300 bronze include five common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C61300 bronze to: wrought 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 17 x 106 psi

Elongation at Break

34 to 40 %

Poisson's Ratio

0.34

Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

370 to 390 MPa 54 to 56 x 103 psi

Tensile Strength: Ultimate (UTS)

550 to 580 MPa 79 to 84 x 103 psi

Tensile Strength: Yield (Proof)

230 to 310 MPa 33 to 45 x 103 psi

Thermal Properties

Latent Heat of Fusion

220 J/g

Maximum Temperature: Mechanical

210 °C 420 °F

Melting Completion (Liquidus)

1050 °C 1910 °F

Melting Onset (Solidus)

1040 °C 1910 °F

Specific Heat Capacity

420 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

55 W/m-K 32 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

12 % IACS

Electrical Conductivity: Equal Weight (Specific)

13 % IACS

Otherwise Unclassified Properties

Base Metal Price

29 % relative

Density

8.5 g/cm3 530 lb/ft3

Embodied Carbon

3.0 kg CO2/kg material

Embodied Energy

49 MJ/kg 21 x 103 BTU/lb

Embodied Water

370 L/kg 44 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

150 to 190 MJ/m3

Resilience: Unit (Modulus of Resilience)

230 to 410 kJ/m3

Stiffness to Weight: Axial

7.5 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

18 to 19 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

15 mm2/s

Thermal Shock Resistance

19 to 20 points

Alloy Composition

Among wrought copper alloys, the composition of C61300 bronze is notable for including aluminum (Al) and silicon (Si). Aluminum is used to add strength and oxidation resistance. Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy.

Copper (Cu) 88 to 91.8
Aluminum (Al) 6.0 to 7.5
Iron (Fe) 2.0 to 3.0
Tin (Sn) 0.2 to 0.5
Manganese (Mn) 0 to 0.2
Zinc (Zn) 0 to 0.2
Nickel (Ni) 0 to 0.15
Silicon (Si) 0 to 0.1
Phosphorus (P) 0 to 0.015
Lead (Pb) 0 to 0.010
Residuals 0 to 0.2

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

Followup Questions

Similar Alloys

Further Reading

ASTM B169: Standard Specification for Aluminum Bronze Sheet, Strip, and Rolled Bar

ASTM B150: Standard Specification for Aluminum Bronze Rod, Bar, and Shapes

ASTM B111: Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015