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UNS C85900 Yellow Brass

C85900 brass is a brass formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has a fairly high ductility among cast brasses. In addition, it has a fairly low melting temperature and a moderately high embodied energy.

The graph bars on the material properties cards below compare C85900 brass to: cast 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

Brinell Hardness

85

Elastic (Young's, Tensile) Modulus

100 GPa 15 x 106 psi

Elongation at Break

30 %

Poisson's Ratio

0.31

Shear Modulus

40 GPa 5.8 x 106 psi

Tensile Strength: Ultimate (UTS)

460 MPa 67 x 103 psi

Tensile Strength: Yield (Proof)

190 MPa 27 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

130 °C 260 °F

Melting Completion (Liquidus)

830 °C 1530 °F

Melting Onset (Solidus)

790 °C 1450 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

89 W/m-K 52 BTU/h-ft-°F

Thermal Expansion

20 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

25 % IACS

Electrical Conductivity: Equal Weight (Specific)

28 % IACS

Otherwise Unclassified Properties

Base Metal Price

24 % relative

Density

8.0 g/cm3 500 lb/ft3

Embodied Carbon

2.9 kg CO2/kg material

Embodied Energy

49 MJ/kg 21 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

170 kJ/m3

Stiffness to Weight: Axial

7.3 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

16 points

Strength to Weight: Bending

17 points

Thermal Diffusivity

29 mm2/s

Thermal Shock Resistance

16 points

Alloy Composition

Among cast copper alloys, the composition of C85900 brass is notable for including zirconium (Zr). Zirconium is used to increase recrystallization temperature and to permit or facilitate certain forms of heat treatment.

Copper (Cu) 58 to 62
Zinc (Zn) 31 to 41
Nickel (Ni) 0 to 1.5
Tin (Sn) 0 to 1.5
Sulfur (S) 0.1 to 0.65
Aluminum (Al) 0.1 to 0.6
Iron (Fe) 0 to 0.5
Silicon (Si) 0 to 0.25
Boron (B) 0 to 0.2
Zirconium (Zr) 0 to 0.2
Antimony (Sb) 0 to 0.2
Lead (Pb) 0 to 0.090
Manganese (Mn) 0 to 0.010
Phosphorus (P) 0 to 0.010
Residuals 0 to 0.7

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

Followup Questions

Similar Alloys

Further Reading

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993