CZ121PB3
CZ121Pb3, categorized as Free cutting brass, stands as a notably enhanced iteration of 60/40 brass, renowned for its outstanding free cutting attributes. It is employed in the high-volume manufacture of brass components where achieving peak productivity and prolonged tool lifespan is imperative, and where there exists no subsequent necessity for cold forming after the machining process.
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 ASTM 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 |
