MakeItFrom.com
Menu (ESC)

UNS C91000 Tin Bronze

C91000 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C91000 is the UNS number for this material. Additionally, the common industry name is 85-15 Tin Bronze.

It has a very high embodied energy among cast bronzes. In addition, it has a very high base cost and a fairly low melting temperature.

The graph bars on the material properties cards below compare C91000 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

180

Elastic (Young's, Tensile) Modulus

110 GPa 15 x 106 psi

Elongation at Break

7.0 %

Poisson's Ratio

0.34

Shear Modulus

39 GPa 5.7 x 106 psi

Tensile Strength: Ultimate (UTS)

230 MPa 34 x 103 psi

Tensile Strength: Yield (Proof)

150 MPa 21 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

160 °C 310 °F

Melting Completion (Liquidus)

960 °C 1760 °F

Melting Onset (Solidus)

820 °C 1500 °F

Specific Heat Capacity

360 J/kg-K 0.087 BTU/lb-°F

Thermal Conductivity

64 W/m-K 37 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

37 % relative

Density

8.6 g/cm3 540 lb/ft3

Embodied Carbon

4.1 kg CO2/kg material

Embodied Energy

67 MJ/kg 29 x 103 BTU/lb

Embodied Water

420 L/kg 51 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

14 MJ/m3

Resilience: Unit (Modulus of Resilience)

100 kJ/m3

Stiffness to Weight: Axial

6.8 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

7.5 points

Strength to Weight: Bending

9.7 points

Thermal Diffusivity

20 mm2/s

Thermal Shock Resistance

8.8 points

Alloy Composition

Among cast copper alloys, the composition of C91000 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) 84 to 86
Tin (Sn) 14 to 16
Phosphorus (P) 0 to 1.5
Zinc (Zn) 0 to 1.5
Nickel (Ni) 0 to 0.8
Lead (Pb) 0 to 0.2
Antimony (Sb) 0 to 0.2
Iron (Fe) 0 to 0.1
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

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

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