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UNS C42500 (CW454K) Tin Brass

C42500 brass is a brass formulated for primary forming into wrought products. CW454K is the EN numeric designation for this material. C42500 is the UNS number. Additionally, the EN chemical designation is CuNi3Zn9. And the AFNOR (French) designation is UE39Z.

It has a moderately high base cost and a moderately high melting temperature among wrought brasses.

The properties of C42500 brass include nine common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C42500 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

110 GPa 16 x 106 psi

Elongation at Break

2.0 to 49 %

Poisson's Ratio


Rockwell B Hardness

60 to 92

Rockwell Superficial 30T Hardness

32 to 76

Shear Modulus

42 GPa 6.1 x 106 psi

Shear Strength

220 to 360 MPa 32 to 53 x 103 psi

Tensile Strength: Ultimate (UTS)

310 to 630 MPa 45 to 92 x 103 psi

Tensile Strength: Yield (Proof)

120 to 590 MPa 17 to 86 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

180 °C 350 °F

Melting Completion (Liquidus)

1030 °C 1890 °F

Melting Onset (Solidus)

1010 °C 1850 °F

Specific Heat Capacity

380 J/kg-K 0.091 BTU/lb-°F

Thermal Conductivity

120 W/m-K 69 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

28 % IACS

Electrical Conductivity: Equal Weight (Specific)

29 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative


8.7 g/cm3 540 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

46 MJ/kg 20 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

12 to 130 MJ/m3

Resilience: Unit (Modulus of Resilience)

64 to 1570 kJ/m3

Stiffness to Weight: Axial

7.1 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

9.9 to 20 points

Strength to Weight: Bending

12 to 19 points

Thermal Diffusivity

36 mm2/s

Thermal Shock Resistance

11 to 22 points

Alloy Composition

Among wrought copper alloys, the composition of C42500 brass is notable for including phosphorus (P) and tin (Sn). Phosphorus is used as an alloy deoxidizer, and to reduce vulnerability to dezincification. Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media.

Copper (Cu)Cu 87 to 90
Zinc (Zn)Zn 6.1 to 11.5
Tin (Sn)Sn 1.5 to 3.0
Phosphorus (P)P 0 to 0.35
Iron (Fe)Fe 0 to 0.050
Lead (Pb)Pb 0 to 0.050
Residualsres. 0 to 0.5

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

Followup Questions

Similar Alloys