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UNS C84100 Semi-Red Brass

C84100 brass is a brass formulated for casting. Cited properties are appropriate for the annealed condition. It has a moderately low tensile strength among cast brasses. In addition, it has a moderately high base cost and a moderately low ductility.

The graph bars on the material properties cards below compare C84100 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


Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

13 %

Poisson's Ratio


Shear Modulus

39 GPa 5.7 x 106 psi

Tensile Strength: Ultimate (UTS)

230 MPa 33 x 103 psi

Tensile Strength: Yield (Proof)

81 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 320 °F

Melting Completion (Liquidus)

1000 °C 1830 °F

Melting Onset (Solidus)

810 °C 1490 °F

Specific Heat Capacity

380 J/kg-K 0.091 BTU/lb-°F

Thermal Conductivity

110 W/m-K 61 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

23 % IACS

Electrical Conductivity: Equal Weight (Specific)

25 % IACS

Otherwise Unclassified Properties

Base Metal Price

29 % relative


8.5 g/cm3 530 lb/ft3

Embodied Carbon

2.9 kg CO2/kg material

Embodied Energy

48 MJ/kg 21 x 103 BTU/lb

Embodied Water

340 L/kg 40 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

24 MJ/m3

Resilience: Unit (Modulus of Resilience)

30 kJ/m3

Stiffness to Weight: Axial

7.1 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

7.4 points

Strength to Weight: Bending

9.7 points

Thermal Diffusivity

33 mm2/s

Thermal Shock Resistance

7.8 points

Alloy Composition

Among cast copper alloys, the composition of C84100 brass is notable for including bismuth (Bi). Bismuth improves machinability and pressure tightness. It is used a non-toxic but more expensive replacement for lead.

Copper (Cu) 78 to 85
Zinc (Zn) 12 to 20
Tin (Sn) 1.5 to 4.5
Nickel (Ni) 0 to 0.5
Iron (Fe) 0 to 0.3
Lead (Pb) 0.050 to 0.25
Bismuth (Bi) 0 to 0.090
Phosphorus (P) 0 to 0.050
Antimony (Sb) 0 to 0.050
Silicon (Si) 0 to 0.010
Aluminum (Al) 0 to 0.010
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys