MakeItFrom.com
Menu (ESC)

UNS C87900 Silicon Brass

C87900 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition.

It has a moderately high thermal conductivity among cast brasses. In addition, it has a fairly low electrical conductivity and a moderately high tensile strength.

The graph bars on the material properties cards below compare C87900 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

110 GPa 15 x 106 psi

Elongation at Break

25 %

Poisson's Ratio

0.31

Rockwell B Hardness

70

Shear Modulus

41 GPa 5.9 x 106 psi

Tensile Strength: Ultimate (UTS)

480 MPa 70 x 103 psi

Tensile Strength: Yield (Proof)

240 MPa 35 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

130 °C 270 °F

Melting Completion (Liquidus)

930 °C 1700 °F

Melting Onset (Solidus)

900 °C 1650 °F

Specific Heat Capacity

390 J/kg-K 0.094 BTU/lb-°F

Thermal Conductivity

120 W/m-K 67 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

15 % IACS

Electrical Conductivity: Equal Weight (Specific)

17 % IACS

Otherwise Unclassified Properties

Base Metal Price

24 % relative

Density

8.1 g/cm3 500 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

100 MJ/m3

Resilience: Unit (Modulus of Resilience)

270 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

17 points

Thermal Diffusivity

37 mm2/s

Thermal Shock Resistance

16 points

Alloy Composition

Among cast copper alloys, the composition of C87900 brass is notable for including arsenic (As). Arsenic is used to protect the alloy against dezincification.

Copper (Cu) 63 to 69.2
Zinc (Zn) 30 to 36
Silicon (Si) 0.8 to 1.2
Nickel (Ni) 0 to 0.5
Iron (Fe) 0 to 0.4
Tin (Sn) 0 to 0.25
Lead (Pb) 0 to 0.25
Manganese (Mn) 0 to 0.15
Aluminum (Al) 0 to 0.15
Sulfur (S) 0 to 0.050
Antimony (Sb) 0 to 0.050
Arsenic (As) 0 to 0.050
Phosphorus (P) 0 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001