C3771
DESCRIPTION
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) |
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 |
TYPICAL USES
- Architecture
- Builders Hardware
