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UNS C90900 Tin Bronze

C90900 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a very high embodied energy among cast bronzes. In addition, it has a fairly high base cost and a fairly low melting temperature.

The graph bars on the material properties cards below compare C90900 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

90

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

15 %

Poisson's Ratio

0.34

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

280 MPa 40 x 103 psi

Tensile Strength: Yield (Proof)

140 MPa 20 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 330 °F

Melting Completion (Liquidus)

980 °C 1790 °F

Melting Onset (Solidus)

820 °C 1500 °F

Specific Heat Capacity

360 J/kg-K 0.087 BTU/lb-°F

Thermal Conductivity

65 W/m-K 38 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

11 % IACS

Otherwise Unclassified Properties

Base Metal Price

36 % relative

Density

8.7 g/cm3 540 lb/ft3

Embodied Carbon

3.9 kg CO2/kg material

Embodied Energy

64 MJ/kg 27 x 103 BTU/lb

Embodied Water

410 L/kg 49 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

35 MJ/m3

Resilience: Unit (Modulus of Resilience)

89 kJ/m3

Stiffness to Weight: Axial

6.8 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.8 points

Strength to Weight: Bending

11 points

Thermal Diffusivity

21 mm2/s

Thermal Shock Resistance

10 points

Alloy Composition

Among cast copper alloys, the composition of C90900 bronze is notable for containing a comparatively high amount of tin (Sn) and including sulfur (S). Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media. It also places certain constraints on cast part design, so as to avoid porosity problems. Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity.

Copper (Cu) 86 to 89
Tin (Sn) 12 to 14
Nickel (Ni) 0 to 0.5
Lead (Pb) 0 to 0.25
Zinc (Zn) 0 to 0.25
Antimony (Sb) 0 to 0.2
Iron (Fe) 0 to 0.15
Phosphorus (P) 0 to 0.050
Sulfur (S) 0 to 0.050
Silicon (Si) 0 to 0.0050
Aluminum (Al) 0 to 0.0050
Residuals 0 to 0.6

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