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Soft Annealed (O60) C67000 Bronze

O60 C67000 bronze is C67000 bronze in the O60 (soft annealed) temper. It has the lowest strength and highest ductility compared to the other variants of C67000 bronze. The graph bars on the material properties cards below compare O60 C67000 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 16 x 106 psi

Elongation at Break

11 %

Poisson's Ratio

0.31

Shear Modulus

42 GPa 6.1 x 106 psi

Shear Strength

390 MPa 57 x 103 psi

Tensile Strength: Ultimate (UTS)

660 MPa 95 x 103 psi

Tensile Strength: Yield (Proof)

350 MPa 51 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 310 °F

Melting Completion (Liquidus)

900 °C 1650 °F

Melting Onset (Solidus)

850 °C 1570 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

99 W/m-K 57 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

22 % IACS

Electrical Conductivity: Equal Weight (Specific)

25 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative

Density

7.9 g/cm3 500 lb/ft3

Embodied Carbon

2.9 kg CO2/kg material

Embodied Energy

49 MJ/kg 21 x 103 BTU/lb

Embodied Water

350 L/kg 42 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

62 MJ/m3

Resilience: Unit (Modulus of Resilience)

560 kJ/m3

Stiffness to Weight: Axial

7.8 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

23 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

30 mm2/s

Thermal Shock Resistance

21 points

Alloy Composition

Copper (Cu)Cu 63 to 68
Zinc (Zn)Zn 21.8 to 32.5
Aluminum (Al)Al 3.0 to 6.0
Manganese (Mn)Mn 2.5 to 5.0
Iron (Fe)Fe 2.0 to 4.0
Tin (Sn)Sn 0 to 0.5
Lead (Pb)Pb 0 to 0.2
Residualsres. 0 to 0.5

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

Followup Questions

Further Reading

ASTM B138: Standard Specification for Manganese Bronze Rod, Bar, and Shapes

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