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UNS C87200 Silicon Bronze

C87200 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a fairly low thermal conductivity among cast bronzes. In addition, it has a very low electrical conductivity and a very high ductility.

The graph bars on the material properties cards below compare C87200 bronze to: cast bronzes (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

Brinell Hardness

85

Elastic (Young's, Tensile) Modulus

110 GPa 17 x 106 psi

Elongation at Break

30 %

Poisson's Ratio

0.34

Shear Modulus

43 GPa 6.2 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

260 J/g

Maximum Temperature: Mechanical

200 °C 380 °F

Melting Completion (Liquidus)

970 °C 1780 °F

Melting Onset (Solidus)

860 °C 1580 °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

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

6.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

29 % relative

Density

8.6 g/cm3 540 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

44 MJ/kg 19 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

93 MJ/m3

Resilience: Unit (Modulus of Resilience)

130 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

12 points

Strength to Weight: Bending

14 points

Thermal Diffusivity

8.0 mm2/s

Thermal Shock Resistance

14 points

Alloy Composition

Among cast copper alloys, the composition of C87200 bronze is notable for containing comparatively high amounts of silicon (Si) and iron (Fe). Silicon is used to improve casting fluidity and lower melting temperature. It also raises strength at the expense of ductility. Iron is used to increase strength inexpensively.

Copper (Cu) 89 to 99
Silicon (Si) 1.0 to 5.0
Zinc (Zn) 0 to 5.0
Iron (Fe) 0 to 2.5
Manganese (Mn) 0 to 1.5
Aluminum (Al) 0 to 1.5
Tin (Sn) 0 to 1.0
Phosphorus (P) 0 to 0.5
Lead (Pb) 0 to 0.5

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