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
0.33
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
Density
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.
| Cu | 87 to 90 | |
| Zn | 6.1 to 11.5 | |
| Sn | 1.5 to 3.0 | |
| P | 0 to 0.35 | |
| Fe | 0 to 0.050 | |
| Pb | 0 to 0.050 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.