C3771
C3771, Section brass, is a readily extrudable leaded alpha/beta brass with a small aluminium addition, which gives a bright golden colour. The lead gives free cutting properties. C3771 is available as extruded rods and flats which are typically used in 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) |
UTS Max (N/mm²) |
PS Min (N/mm²) |
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 |
| Density |
0.303 lb/in3 |
| CTE, linear |
14.4 ?in/in-?F |
| Specific Heat Capacity |
0.0908 BTU/lb-?F |
| Thermal Conductivity |
784 BTU-in/hr-ft²-?F |
| Melting Point |
1620 – 1650 ?F |
| Solidus |
1620 ?F |
| Liquidus |
1650?F |
Fabrication Properties
| FABRICATION PROPERTIES |
| Technique |
Suitability |
| Machinability (CuZn39Pb3 = 100 %) |
95.00% |
| Capacity for Being Cold Worked |
Poor |
| Capacity for Being Hot Worked |
Excellent |
