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UNS C68300 Antimony-Silicon Brass

C68300 brass is a brass formulated for primary forming into wrought products. Cited properties are appropriate for the M30 (as hot extruded) condition. The graph bars on the material properties cards below compare C68300 brass to: wrought brasses (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

Elastic (Young's, Tensile) Modulus

100 GPa 15 x 106 psi

Elongation at Break

15 %

Poisson's Ratio

0.31

Rockwell B Hardness

60

Shear Modulus

40 GPa 5.8 x 106 psi

Shear Strength

260 MPa 38 x 103 psi

Tensile Strength: Ultimate (UTS)

430 MPa 62 x 103 psi

Tensile Strength: Yield (Proof)

260 MPa 38 x 103 psi

Thermal Properties

Latent Heat of Fusion

180 J/g

Maximum Temperature: Mechanical

120 °C 250 °F

Melting Completion (Liquidus)

900 °C 1660 °F

Melting Onset (Solidus)

890 °C 1630 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

120 W/m-K 68 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

23 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

340 L/kg 41 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

56 MJ/m3

Resilience: Unit (Modulus of Resilience)

330 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

15 points

Strength to Weight: Bending

16 points

Thermal Diffusivity

38 mm2/s

Thermal Shock Resistance

14 points

Alloy Composition

Among wrought copper alloys, the composition of C68300 brass is notable for including cadmium (Cd) and antimony (Sb). Cadmium is used to improve strength at elevated temperatures. Antimony is used to improve certain types of corrosion resistance.

Copper (Cu) 59 to 63
Zinc (Zn) 34.2 to 40.4
Silicon (Si) 0.3 to 1.0
Antimony (Sb) 0.3 to 1.0
Tin (Sn) 0.050 to 0.2
Lead (Pb) 0 to 0.090
Cadmium (Cd) 0 to 0.010
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

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