C48640
C48640 Spec SheetC48640 naval brass is a copper-zinc-tin alloy known for its excellent corrosion resistance in marine environments, good strength, and machinability. It is widely used in shipbuilding, marine hardware, and industrial applications requiring durability against seawater.
Chemical Composition
| Elements | Min (%) | Max (%) |
|---|---|---|
| Cu | 59.00 | 62.00 |
| Sn | 0.50 | 2.00 |
| Pb | 1.00 | 3.00 |
| Zn | Remainder | |
| Fe | 0.00 | 0.40 |
| Ni | 0.00 | 0.30 |
| P | 0.05 | 0.25 |
Mechanical properties according to ASTM B21 C48640 (as per temper HO2)
| Range (inch) | UTS Min (ksi) |
UTS Max (ksi) |
PS Min (ksi) |
Elongation Min (%) |
Hardness | ||
|---|---|---|---|---|---|---|---|
| Hardness Min (HRB) |
Hardness Max (HRB) |
||||||
| Round (Dia) | 0.300 – 0.500 | 45.7 | – | 18 | 5 | – | – |
| 0.500 – 1.000 | 45.7 | – | 18 | 10 | – | – | |
| 1.000 – 2.000 | 45.7 | – | 18 | 15 | – | – | |
| Hex (A/F) | 0.300 – 0.500 | 45.7 | – | 18 | 5 | – | – |
| 0.500 – 1.000 | 45.7 | – | 18 | 10 | – | – | |
| 1.000 – 2.000 | 45.7 | – | 18 | 15 | – | – | |
| Square (A/F) | 0.300 – 0.500 | 45.7 | – | 18 | 5 | – | – |
| 0.500 – 1.000 | 45.7 | – | 18 | 10 | – | – | |
| 1.000 – 2.000 | 45.7 | – | 18 | 15 | – | – | |
| Rectangle | Thickness: 0.300 – 0.500 | 45.7 | – | 18 | 5 | – | – |
| Width: 0.500 – 1.000 | |||||||
| Thickness: 0.500 – 1.000 | 45.7 | – | 18 | 10 | – | – | |
| Width: 1.000 – 2.000 | |||||||
| Thickness: 1.000 – 2.000 | 45.7 | – | 18 | 15 | – | – | |
| Width: 2.000 – 3.000 | |||||||
| Range (mm) | UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
||
|---|---|---|---|---|---|---|---|---|
| Round (Dia) | 8 | 12 | 315 | – | 124 | 5 | – | – |
| 12 | 25 | 315 | – | 124 | 10 | – | – | |
| 25 | 50 | 315 | – | 124 | 15 | – | – | |
| Hex (A/F) | 8 | 12 | 315 | – | 124 | 5 | – | – |
| 12 | 25 | 315 | – | 124 | 10 | – | – | |
| 25 | 50 | 315 | – | 124 | 15 | – | – | |
| Square (A/F) | 8 | 12 | 315 | – | 124 | 5 | – | – |
| 12 | 25 | 315 | – | 124 | 10 | – | – | |
| 25 | 50 | 315 | – | 124 | 15 | – | – | |
| Rectangle | Thickness | 8 – 12 | 315 | – | 124 | 5 | – | – |
| Width | 12 – 25 | |||||||
| Thickness | 12 – 25 | 315 | – | 124 | 10 | – | – | |
| Width | 25 – 50 | |||||||
| Thickness | 25 – 50 | 315 | – | 124 | 15 | – | – | |
| Width | 50 – 75 | |||||||
| PHYSICAL PROPERTIES | |
|---|---|
| Melting Range | 1591–1639 °F (866–893 °C) |
| Density | 0.303 lb/cu in (8.4 g/cm³) |
| Electrical Conductivity | ~22.4% IACS |
| Thermal Conductivity | 59.3 Btu/sq. ft/ft hr/°F |
| Coefficient of Thermal Expansion | 11.9 × 10⁻⁶ per °F (68–572 °F) |
| Modulus of Elasticity | 16,000 ksi |
| Modulus of Rigidity | 6,000 ksi |
| FABRICATION PROPERTIES | |
|---|---|
| Technique | Suitability |
| Hot Working | Excellent |
| Cold Working | Excellent |
| Machinability | Good |
| Soldering and brazing | Good |
| Welding | Fair |
Typical Uses
Propeller shafts and pump shafts
Bushings and bearings
Valves, fasteners, and fittings
Marine hardware
