CZ121PB4
CZ121Pb4, Free cutting brass, is a significantly improved form of 60/40 brass, with excellent free cutting properties. It is used in the mass production of brass components where maximum output and longest tool life are required, and where no further cold forming after machining is required.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 56.50 | 58.50 |
| Pb | 3.50 | 4.50 |
| Fe | - | 0.30 |
| Total Others | - | 0.70 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO BS2874 (AS PER TEMPER M)
| Range (mm) | From | To | UTS Min (Kg/mm²) | UTS Max (Kg/mm²) | PS Min (Kg/mm²) | Elongation Min (%) | Hardness Min | Hardness Max | |
|---|---|---|---|---|---|---|---|---|---|
| Round (Dia) | 2 | 18 | 425 | - | - | 15 | - | - | |
| 18 | 40 | 400 | - | - | 18 | - | - | ||
| 40 | 75 | 380 | - | - | 20 | - | - | ||
| Hex (A/F) | 3 | 18 | 425 | - | - | 15 | - | - | |
| 18 | 40 | 400 | - | - | 380 | - | - | ||
| 40 | 70 | 380 | - | - | 20 | - | - | ||
| Square (A/F) | 3 | 18 | 425 | - | - | 15 | - | - | |
| 18 | 40 | 400 | - | - | 18 | - | - | ||
| 40 | 60 | 380 | - | - | 20 | - | - | ||
| Rectangle | Thickness | 3 | 18 | 425 | - | - | 15 | - | - |
| Thickness | 18 | 40 | 400 | - | - | 18 | - | - | |
| Thickness | 40 | 50 | 380 | - | - | 20 | - | - | |
| PHYSICAL PROPERTIES | |
|---|---|
| Melting Point - Liquidus °F | 1630 |
| Melting Point - Solidus °F | 1610 |
| Density lb/cu in at 68°F | 0.306 |
| Specific Gravity | 8.47 |
| Electrical Conductivity %IACS at 68°F | 28 |
| Thermal Conductivity BTU/ sq ft/ ft hr/ °F at 68°F | 71 |
| Coefficient of Thermal Expansion 68-572 10⁻⁶ per °F (68 – 572°F) | 11.6 |
| Specific Heat BTU/ lb /°F at 68°F | 0.09 |
| Modulus of Elasticity in Tension ksi | 14000 |
| Modulus of Rigidity ksi | 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 Welding | Not Recommended |
| Seam Welding | Not Recommended |
| Butt Welding | Fair |
| Capacity for Being Cold Worked | Poor |
| - | Excellent |
| Machinability Rating | 90 |
TYPICAL USES
- Architecture
- Builders Hardware
- Consumer
- Industrial
- Ordnance