UNS C66900 Manganese Brass
C66900 brass is a brass formulated for primary forming into wrought products. It has the lowest electrical conductivity and a moderately low melting temperature among wrought brasses.
The properties of C66900 brass include seven 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 C66900 brass 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
120 GPa 17 x 106 psi
Elongation at Break
1.1 to 26 %
Poisson's Ratio
0.32
Rockwell B Hardness
65 to 100
Rockwell Superficial 30T Hardness
60 to 88
Shear Modulus
45 GPa 6.5 x 106 psi
Shear Strength
290 to 440 MPa 42 to 64 x 103 psi
Tensile Strength: Ultimate (UTS)
460 to 770 MPa 66 to 110 x 103 psi
Tensile Strength: Yield (Proof)
330 to 760 MPa 48 to 110 x 103 psi
Thermal Properties
Latent Heat of Fusion
190 J/g
Maximum Temperature: Mechanical
150 °C 300 °F
Melting Completion (Liquidus)
860 °C 1580 °F
Melting Onset (Solidus)
850 °C 1550 °F
Specific Heat Capacity
400 J/kg-K 0.095 BTU/lb-°F
Thermal Expansion
20 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
3.4 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.8 % IACS
Otherwise Unclassified Properties
Base Metal Price
23 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
2.8 kg CO2/kg material
Embodied Energy
46 MJ/kg 20 x 103 BTU/lb
Embodied Water
310 L/kg 37 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
4.6 to 200 MJ/m3
Resilience: Unit (Modulus of Resilience)
460 to 2450 kJ/m3
Stiffness to Weight: Axial
8.1 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
15 to 26 points
Strength to Weight: Bending
16 to 23 points
Thermal Shock Resistance
14 to 23 points
Alloy Composition
Among wrought copper alloys, the composition of C66900 brass is notable for including manganese (Mn). Manganese is used to improve strength without a proportional reduction in ductility.
| Cu | 62.5 to 64.5 | |
| Zn | 22.5 to 26 | |
| Mn | 11.5 to 12.5 | |
| Fe | 0 to 0.25 | |
| Pb | 0 to 0.050 | |
| res. | 0 to 0.2 |
All values are % weight. Ranges represent what is permitted under applicable standards.