UNS C99750 Manganese White Brass
C99750 brass is a brass formulated for casting. It has a fairly low base cost among cast brasses. In addition, it has the lowest electrical conductivity and a fairly high embodied energy.
The properties of C99750 brass include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C99750 brass to: cast 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
Brinell Hardness
110 to 120
Elastic (Young's, Tensile) Modulus
130 GPa 18 x 106 psi
Elongation at Break
20 to 30 %
Poisson's Ratio
0.32
Rockwell B Hardness
77 to 82
Shear Modulus
48 GPa 6.9 x 106 psi
Tensile Strength: Ultimate (UTS)
450 to 520 MPa 65 to 75 x 103 psi
Tensile Strength: Yield (Proof)
220 to 280 MPa 32 to 40 x 103 psi
Thermal Properties
Latent Heat of Fusion
200 J/g
Maximum Temperature: Mechanical
160 °C 330 °F
Melting Completion (Liquidus)
840 °C 1550 °F
Melting Onset (Solidus)
820 °C 1500 °F
Specific Heat Capacity
410 J/kg-K 0.1 BTU/lb-°F
Thermal Expansion
20 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
23 % relative
Density
8.1 g/cm3 500 lb/ft3
Embodied Carbon
3.1 kg CO2/kg material
Embodied Energy
51 MJ/kg 22 x 103 BTU/lb
Embodied Water
310 L/kg 38 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
87 to 110 MJ/m3
Resilience: Unit (Modulus of Resilience)
190 to 300 kJ/m3
Stiffness to Weight: Axial
8.6 points
Stiffness to Weight: Bending
21 points
Strength to Weight: Axial
15 to 18 points
Strength to Weight: Bending
16 to 18 points
Thermal Shock Resistance
13 to 15 points
Alloy Composition
Among cast copper alloys, the composition of C99750 brass is notable for containing comparatively high amounts of nickel (Ni) and aluminum (Al). Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance. It also creates the need for additional care during casting. Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting.
| Cu | 55 to 61 | |
| Mn | 17 to 23 | |
| Zn | 17 to 23 | |
| Ni | 0 to 5.0 | |
| Al | 0.25 to 3.0 | |
| Pb | 0.5 to 2.5 | |
| Fe | 0 to 1.0 | |
| res. | 0 to 0.3 |
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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015