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
0.31
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
Density
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.
| Cu | 57 to 60 | |
| Zn | 31.1 to 40 | |
| Mn | 2.0 to 3.5 | |
| Al | 0.5 to 2.0 | |
| Si | 0.5 to 1.5 | |
| Pb | 0 to 0.5 | |
| Fe | 0 to 0.35 | |
| Sn | 0 to 0.3 | |
| Ni | 0 to 0.25 | |
| res. | 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