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UNS C99400 Brass

C99400 brass is a brass formulated for casting. It has a fairly high base cost among cast brasses. In addition, it has a very high melting temperature and can have a moderately high tensile strength.

The properties of C99400 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 C99400 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 17 x 106 psi

Poisson's Ratio


Shear Modulus

44 GPa 6.4 x 106 psi

Tensile Strength: Ultimate (UTS)

460 to 550 MPa 66 to 79 x 103 psi

Tensile Strength: Yield (Proof)

230 to 370 MPa 34 to 54 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 J/g

Maximum Temperature: Mechanical

200 °C 400 °F

Melting Completion (Liquidus)

1070 °C 1960 °F

Melting Onset (Solidus)

1020 °C 1860 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

17 % IACS

Electrical Conductivity: Equal Weight (Specific)

17 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative


8.7 g/cm3 540 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

45 MJ/kg 19 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Unit (Modulus of Resilience)

230 to 590 kJ/m3

Stiffness to Weight: Axial

7.5 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

15 to 17 points

Strength to Weight: Bending

15 to 17 points

Thermal Shock Resistance

16 to 19 points

Alloy Composition

Among cast copper alloys, the composition of C99400 brass is notable for containing comparatively high amounts of iron (Fe) and silicon (Si). Iron is used to increase strength inexpensively. Silicon is used to improve casting fluidity and lower melting temperature. It also raises strength at the expense of ductility.

Copper (Cu)Cu 83.5 to 96.5
Zinc (Zn)Zn 0.5 to 5.0
Nickel (Ni)Ni 1.0 to 3.5
Iron (Fe)Fe 1.0 to 3.0
Silicon (Si)Si 0.5 to 2.0
Aluminum (Al)Al 0.5 to 2.0
Manganese (Mn)Mn 0 to 0.5
Lead (Pb)Pb 0 to 0.25
Residualsres. 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