C3771
C3771, classified as Section brass, stands as an easily extrudable alloy, combining alpha and beta phases with a modest introduction of aluminum, resulting in a distinct and vibrant golden hue. The presence of lead imparts free cutting attributes. C3771 is offered in the form of extruded rods and flats, commonly utilized in the domain of builder’s hardware.
CHEMICAL COMPOSITION
| Elements | Min (%) | Max (%) |
| Cu | 57.00 | 61.00 |
| Pb | 1.00 | 2.50 |
| Sn+Fe | – | 1.00 |
| Zn | Remainder | |
MECHANICAL PROPERTIES ACCORDING TO H3250 JIS C3771 (AS PER TEMPER BD)
| Range (mm) | From | To | UTS Min (N/mm²) | PS Min | Elongation Min (%) | Hardness Min | Hardness Max | |
| Round (Dia) | 6 | 75 | 315 | – | 15 | – | – | |
| Hex (A/F) | 6 | 70 | 315 | – | 15 | – | – | |
| Square (A/F) | 6 | 60 | 315 | – | 15 | – | – | |
| Rectangle (Thickness) | 6 | 50 | 315 | – | 15 | – | – | |
| PHYSICAL PROPERTIES | ||
| Physical Properties | Metric | English |
| Density | 8.40 g/cc | 0.303 lb/in3 |
| CTE, linear | 26.0 ᶙm/m-˚C | 14.4 ᶙin/in-˚F |
| Specific Heat Capacity | 0.380 J/g-˚C | 0.0908 BTU/lb-˚F |
| Thermal Conductivity | 113 W/m-K | 784 BTU-in/hr-ft²-˚F |
| Melting Point | 880-900 ˚C | 1620 – 1650 ˚F |
| Solidus | 880 ˚C | 1620 ˚F |
| Liquidus | 900 ˚C | 1650˚F |
| FABRICATION PROPERTIES | |
| Forming | Suitability |
| Machinability (CuZn39Pb3 = 100 %) | 95.00% |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Worked | Excellent |
