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UNS C67400 Manganese-Aluminum Bronze

C67400 bronze is a brass formulated for primary forming into wrought products. It can have a moderately high tensile strength among the wrought brasses in the database.

The properties of C67400 bronze include three 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 C67400 bronze to: wrought brasses (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

22 to 28 %

Poisson's Ratio


Rockwell B Hardness

78 to 85

Shear Modulus

41 GPa 5.9 x 106 psi

Shear Strength

310 to 350 MPa 45 to 50 x 103 psi

Tensile Strength: Ultimate (UTS)

480 to 610 MPa 70 to 89 x 103 psi

Tensile Strength: Yield (Proof)

250 to 370 MPa 37 to 54 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

130 °C 260 °F

Melting Completion (Liquidus)

890 °C 1630 °F

Melting Onset (Solidus)

870 °C 1590 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

100 W/m-K 58 BTU/h-ft-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

23 % IACS

Electrical Conductivity: Equal Weight (Specific)

26 % IACS

Otherwise Unclassified Properties

Base Metal Price

23 % relative


7.9 g/cm3 490 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

48 MJ/kg 21 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

300 to 660 kJ/m3

Stiffness to Weight: Axial

7.5 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

17 to 22 points

Strength to Weight: Bending

17 to 20 points

Thermal Diffusivity

32 mm2/s

Thermal Shock Resistance

16 to 20 points

Alloy Composition

Among wrought copper alloys, the composition of C67400 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)Cu 57 to 60
Zinc (Zn)Zn 31.1 to 40
Manganese (Mn)Mn 2.0 to 3.5
Aluminum (Al)Al 0.5 to 2.0
Silicon (Si)Si 0.5 to 1.5
Lead (Pb)Pb 0 to 0.5
Iron (Fe)Fe 0 to 0.35
Tin (Sn)Sn 0 to 0.3
Nickel (Ni)Ni 0 to 0.25
Residualsres. 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993