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CZ108
CZ108
CZ108 (governed by British Standards BS 2870 for sheet and strip, BS 2873 for wire, and BS 2875 for plate; cross-referenced internationally as UNS C27200 / C27400 or European EN CW508L / CuZn37) is a classic single-phase (α) wrought alpha brass. Formulated with 61.0% to 64.0% copper and a zinc balance with a tightly controlled maximum lead content of 0.07%, CZ108 is engineered specifically for severe cold-forming, deep drawing, spinning, and bending operations. Maintaining a homogeneous face-centered cubic alpha crystal structure at room temperature, CZ108 possesses high ductility and malleability. It is widely recognized as the British industrial standard for stamped metal shells, intricate architectural components, and deep-drawn industrial vessels.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 62.00 | 65.00 |
Pb | – | 0.30 |
Total Others | – | 0.60 |
Zn | Remainder | |
Mechanical Properties According To BS 2873 (As Per Temper 1/2 H)
Range |
From |
To |
UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min |
Hardness Max |
| Round (Dia) | 1.5 |
75 |
460 |
620 |
– |
– |
– |
– |
| Hex (A/F) | 3 |
70 |
460 |
620 |
– |
– |
– |
– |
| Square (A/F) | 3 |
60 |
460 |
620 |
– |
– |
– |
– |
| Rectangle (Thickness) | 3 |
50 |
460 |
620 |
– |
– |
– |
– |
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1680 |
| Density lb/cu in. at 68°F | 0.305 |
| Specific Gravity | 8.44 |
| Electrical Conductivity % IACS at 68°F | 27.6 |
| Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F | 67 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.4 |
| Specific Heat Capacity Btu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 15000 |
| Modulus of Rigidity ksi | 5600 |
FABRICATION PROPERTIES |
|
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Excellent |
| Oxyacetylene Welding | Good |
| Gas Shielded Arc Welding | Fair |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Good |
| Seam Weld | Not Recommended |
| Butt Weld | Good |
| Capacity for Being Cold Worked | Excellent |
| Capacity for Being Hot Formed | Fair |
| Machinability Rating | 35 |
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