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.
| Cu | 91 to 94 | |
| Sn | 6.0 to 8.0 | |
| Ni | 0 to 0.5 | |
| Zn | 0 to 0.5 | |
| Pb | 0 to 0.3 | |
| Fe | 0 to 0.2 | |
| Sb | 0 to 0.2 | |
| P | 0 to 0.050 | |
| S | 0 to 0.050 | |
| Si | 0 to 0.0050 | |
| Al | 0 to 0.0050 | |
| res. | 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