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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.

Copper (Cu) 54 to 65.5
Zinc (Zn) 19 to 25
Manganese (Mn) 11 to 15
Nickel (Ni) 4.0 to 6.0
Aluminum (Al) 0.5 to 3.0
Lead (Pb) 0 to 2.0
Iron (Fe) 0 to 1.0
Tin (Sn) 0 to 1.0
Residuals 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