C18700 Free-Machining Copper (CuPb1P)
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MA18B is a free-machining high copper with machinability rating of 85, very high electrical conductivity, and good capacity for cold work. The alloy is used in applications where machined components from copper are required such as high current contacts, pins, and switch parts, as well as various hardware components with an expected electrical capacity.
Mechanical Properties
Round Rod
| TEMPER NAME | TEMPER CODE | TENSILE STRENGTH | YIELD STRENGTH | ELONGATION | MILL LIMITS |
| min, ksi (MPa) | min, ksi (MPa) @ 0.5% EUL |
min, % | |||
| half-hard | H02 | 38 (260) | 30 (205) | 8 | .0394 - .2500", incl. (1 - 6.5mm, incl.) |
| 38 (260) | 30 (205) | 12 | over .2500 - .3150" (over 6.5 - 8mm) |
||
| hard | H04 | 48 (330) | 40 (275) | 4 | .0394 - .2500", incl. (1 - 6.5mm, incl.) |
| 38 (260) | 30 (205) | 12 | over .2500 - .3150" (over 6.5 - 8mm) |
Round Wire
| TEMPER NAME | TEMPER CODE | TENSILE STRENGTH | YIELD STRENGTH | ELONGATION | MILL LIMITS |
| min, ksi (MPa) | min, ksi (MPa) @ 0.5% EUL |
min, % | |||
| half-hard | H02 | 38(260) | - | 6 | 0.0100 - 0.2362" (0.25 - 6 mm) |
| hard | H04 | 48 (330) | - | 4 |
Physical Properties
| Melting Point (Liquidus) | 1976°F | 1080°C |
| Melting Point (Solidus) | 1747°F | 953°C |
| Annealing Range (min - max) | 800 - 1200 °F | 425 - 650 °C |
| Density | 0.323 lb/cu in | 8.94 gm/cu cm |
| Electrical Resistivity (Annealed) | 10.8 Ω·cir-mil/ft @ 68 °F | 1.79 µΩ·cm @ 20 °C |
| Electrical Conductivity (Annealed) | 96% IACS @ 68°F | 0.557 MS/cm @ 20°C |
| Thermal Conductivity | 218 Btu/sq ft/ft·hr/°F @ 68 °F | 377 W/m·K @ 20 °C |
| Coefficient of Thermal Expansion | 0.0000098°F (68-572°F) | 0.0000177°C (20-300°C) |
| Modulus of Elasticity (Tension) | 17,000 ksi | 117,000 MPa |
| Modulus of Rigidity | 6,400 ksi | 44,100 MPa |
For a full size version of product specifications, including chemical composition in both US and Metric units, please download the PDF.