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UNS C90200 Tin Bronze

C90200 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 ductility among cast bronzes. In addition, it has a moderately high electrical conductivity and a moderately low tensile strength.

The graph bars on the material properties cards below compare C90200 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

70

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

30 %

Poisson's Ratio

0.34

Shear Modulus

41 GPa 6.0 x 106 psi

Tensile Strength: Ultimate (UTS)

260 MPa 38 x 103 psi

Tensile Strength: Yield (Proof)

110 MPa 16 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

180 °C 360 °F

Melting Completion (Liquidus)

1050 °C 1910 °F

Melting Onset (Solidus)

880 °C 1610 °F

Specific Heat Capacity

370 J/kg-K 0.089 BTU/lb-°F

Thermal Conductivity

62 W/m-K 36 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

13 % IACS

Electrical Conductivity: Equal Weight (Specific)

13 % IACS

Otherwise Unclassified Properties

Base Metal Price

34 % relative

Density

8.8 g/cm3 550 lb/ft3

Embodied Carbon

3.3 kg CO2/kg material

Embodied Energy

53 MJ/kg 23 x 103 BTU/lb

Embodied Water

370 L/kg 44 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

63 MJ/m3

Resilience: Unit (Modulus of Resilience)

55 kJ/m3

Stiffness to Weight: Axial

7.0 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.3 points

Strength to Weight: Bending

10 points

Thermal Diffusivity

19 mm2/s

Thermal Shock Resistance

9.5 points

Alloy Composition

Among cast copper alloys, the composition of C90200 bronze is notable for including sulfur (S) and antimony (Sb). Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity. Antimony is used to improve certain types of corrosion resistance.

Copper (Cu) 91 to 94
Tin (Sn) 6.0 to 8.0
Nickel (Ni) 0 to 0.5
Zinc (Zn) 0 to 0.5
Lead (Pb) 0 to 0.3
Iron (Fe) 0 to 0.2
Antimony (Sb) 0 to 0.2
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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015