UNS C66700 Manganese Brass
C66700 brass is a brass formulated for primary forming into wrought products. It has a moderately high melting temperature and a moderately low thermal conductivity among wrought brasses.
The properties of C66700 brass include nine 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 C66700 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
110 GPa 16 x 106 psi
Elongation at Break
2.0 to 58 %
Poisson's Ratio
0.31
Rockwell B Hardness
57 to 93
Rockwell Superficial 30T Hardness
30 to 90
Shear Modulus
41 GPa 6.0 x 106 psi
Shear Strength
250 to 530 MPa 36 to 77 x 103 psi
Tensile Strength: Ultimate (UTS)
340 to 690 MPa 49 to 100 x 103 psi
Tensile Strength: Yield (Proof)
100 to 640 MPa 15 to 93 x 103 psi
Thermal Properties
Latent Heat of Fusion
180 J/g
Maximum Temperature: Mechanical
140 °C 290 °F
Melting Completion (Liquidus)
1090 °C 2000 °F
Melting Onset (Solidus)
1050 °C 1920 °F
Specific Heat Capacity
390 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
97 W/m-K 56 BTU/h-ft-°F
Thermal Expansion
20 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
17 % IACS
Electrical Conductivity: Equal Weight (Specific)
19 % IACS
Otherwise Unclassified Properties
Base Metal Price
25 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
2.7 kg CO2/kg material
Embodied Energy
45 MJ/kg 19 x 103 BTU/lb
Embodied Water
320 L/kg 38 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
13 to 150 MJ/m3
Resilience: Unit (Modulus of Resilience)
49 to 1900 kJ/m3
Stiffness to Weight: Axial
7.3 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
11 to 23 points
Strength to Weight: Bending
13 to 21 points
Thermal Diffusivity
30 mm2/s
Thermal Shock Resistance
11 to 23 points
Alloy Composition
Among wrought copper alloys, the composition of C66700 brass is notable for including manganese (Mn). Manganese is used to improve strength without a proportional reduction in ductility.
| Cu | 68.5 to 71.5 | |
| Zn | 26.3 to 30.7 | |
| Mn | 0.8 to 1.5 | |
| Fe | 0 to 0.1 | |
| Pb | 0 to 0.070 | |
| 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