UNS C99700 Manganese White Brass
C99700 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a very low electrical conductivity among the cast brasses in the database.
The graph bars on the material properties cards below compare C99700 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
Elastic (Young's, Tensile) Modulus
120 GPa 18 x 106 psi
Elongation at Break
25 %
Poisson's Ratio
0.32
Shear Modulus
46 GPa 6.7 x 106 psi
Tensile Strength: Ultimate (UTS)
380 MPa 55 x 103 psi
Tensile Strength: Yield (Proof)
170 MPa 25 x 103 psi
Thermal Properties
Latent Heat of Fusion
200 J/g
Maximum Temperature: Mechanical
160 °C 330 °F
Melting Completion (Liquidus)
900 °C 1660 °F
Melting Onset (Solidus)
880 °C 1610 °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
3.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
25 % relative
Density
8.1 g/cm3 510 lb/ft3
Embodied Carbon
3.3 kg CO2/kg material
Embodied Energy
53 MJ/kg 23 x 103 BTU/lb
Embodied Water
320 L/kg 38 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
78 MJ/m3
Resilience: Unit (Modulus of Resilience)
120 kJ/m3
Stiffness to Weight: Axial
8.3 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
13 points
Strength to Weight: Bending
14 points
Thermal Shock Resistance
11 points
Alloy Composition
Among cast copper alloys, the composition of C99700 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 | 54 to 65.5 | |
| Zn | 19 to 25 | |
| Mn | 11 to 15 | |
| Ni | 4.0 to 6.0 | |
| Al | 0.5 to 3.0 | |
| Pb | 0 to 2.0 | |
| Fe | 0 to 1.0 | |
| Sn | 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