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CZ121
CZ121
CZ121 (designated under the British Standard BS 2874 and harmonized in European standards as EN 12164 / CW614N) is the European benchmark alloy for high-speed automated turning, drilling, and milling. Known metallurgically as CuZn39Pb3, it contains approximately 3% lead distributed throughout an $(\alpha + \beta)$ duplex brass matrix. This structure acts as a built-in chip breaker and natural lubricant, ensuring rapid cycle times, minimal tool wear, and clean surface finishes..
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 56.50 | 58.50 |
Pb | 2.50 | 3.50 |
Fe | – | 0.30 |
Total Others | – | 0.70 |
Zn | Remainder | |
Mechanical Properties According To B455 (As Per Temper M)
Range (mm) |
From |
To |
UTS Min (N/mm²) |
PS Min |
Elongation Min (%) |
Hardness Min |
Hardness Max |
|
| Round (Dia) | 1.5 |
18 |
425 |
– |
15 |
– |
– |
|
18 |
40 |
400 |
– |
20 |
– |
– |
||
40 |
75 |
380 |
– |
20 |
– |
– |
||
| Hex (A/F) | 3 |
18 |
425 |
– |
15 |
– |
– |
|
18 |
40 |
400 |
– |
20 |
– |
– |
||
40 |
70 |
380 |
– |
20 |
– |
– |
||
| Square (A/F) | 3 |
18 |
425 |
– |
15 |
– |
– |
|
18 |
40 |
400 |
– |
20 |
– |
– |
||
40 |
60 |
380 |
– |
20 |
– |
– |
||
| Rectangle (Thickness) | 4 |
18 |
425 |
– |
15 |
– |
– |
|
18 |
40 |
400 |
– |
20 |
– |
– |
||
40 |
50 |
350 |
– |
25 |
– |
– |
||
PHYSICAL PROPERTIES |
|
| Melting Point – Liquidus°F | 1630 |
| Melting Point – Solidus°F | 1610 |
| Densitylb/cu in. at 68°F | 0.306 |
| Specific Gravity | 8.47 |
| Electrical Conductivity% IACS at 68°F | 28 |
| Thermal ConductivityBtu/ sq ft/ ft hr/ °F at 68°F | 71 |
| Coefficient of Thermal Expansion 68-57210⁻⁶ per °F (68 – 572°F) | 11.6 |
| Specific Heat CapacityBtu/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tensionksi | 14000 |
| Modulus of Rigidityksi | 5300 |
FABRICATION PROPERTIES |
|
| Technique | Suitability |
| Soldering | Excellent |
| Brazing | Good |
| Oxyacetylene Welding | Not Recommended |
| Gas Shielded Arc Welding | Not Recommended |
| Coated Metal Arc Welding | Not Recommended |
| Spot Weld | Not Recommended |
| Seam Weld | Not Recommended |
| Butt Weld | Fair |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Formed | Excellent |
| Machinability Rating | 90 |
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