MakeItFrom.com
Menu (ESC)

UNS C87800 Silicon Brass

C87800 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a moderately low thermal conductivity among cast brasses. In addition, it has a fairly low electrical conductivity and a very high tensile strength.

The graph bars on the material properties cards below compare C87800 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 16 x 106 psi

Elongation at Break

25 %

Poisson's Ratio

0.33

Rockwell B Hardness

86

Shear Modulus

42 GPa 6.1 x 106 psi

Tensile Strength: Ultimate (UTS)

590 MPa 85 x 103 psi

Tensile Strength: Yield (Proof)

350 MPa 50 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

920 °C 1680 °F

Melting Onset (Solidus)

820 °C 1510 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

28 W/m-K 16 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

6.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

7.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

27 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

44 MJ/kg 19 x 103 BTU/lb

Embodied Water

300 L/kg 36 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

130 MJ/m3

Resilience: Unit (Modulus of Resilience)

540 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

19 points

Thermal Diffusivity

8.3 mm2/s

Thermal Shock Resistance

21 points

Alloy Composition

Among cast copper alloys, the composition of C87800 brass is notable for including arsenic (As). Arsenic is used to protect the alloy against dezincification.

Copper (Cu) 80 to 84.2
Zinc (Zn) 12 to 16
Silicon (Si) 3.8 to 4.2
Tin (Sn) 0 to 0.25
Nickel (Ni) 0 to 0.2
Manganese (Mn) 0 to 0.15
Iron (Fe) 0 to 0.15
Aluminum (Al) 0 to 0.15
Lead (Pb) 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
Magnesium (Mg) 0 to 0.010
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B176: Standard Specification for Copper-Alloy Die Castings

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