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Physical and Mechanical Properties
| Physical Properties | Units | EFI 79 | Efi 50 | Efi Cobalt 50 | Efi Core Iron |
| Density | lbs/in | .316 | .295 | .295 | .284 |
| gm/cc | 8.74 | 8.18 | 8.20 | 7.86 | |
| Curie Temperature | °F | 860 | 840 | 1710 | 1400 |
| °C | 460 | 450 | 932 | 760 | |
| Electrical Resisitivity | ohm-cir-mil/ft | 349 | 290 | 253 | 79 |
| micro-ohm-mm | 580 | 480 | 420 | 130 | |
| Thermal Conductivity | BTU-in/hr-sq.ft-°F | 134 | 90 | — | 500 |
| W/m·K | 19 | 13 | — | 73 | |
| Coefficient of Thermal Expansion (25°C to 400°C) (75°F to 750°F) |
micro-in/in-°F | 7.4 | 4.6 | 5.61 | 8.1 |
| micro-cm/cm-°C | 13.3 | 8.3 | 10.1 | 14.5 | |
| Specific Heat | BTU/lb-F | 0.12 | 0.12 | - | 0.11 |
| J/gm·K | 0.5 | 0.5 | - | 0.45 |
| Mechanical Properties (typical) | |||||
| Tensile | ksi (MPa) | 80 (552) | 75 (517) | 120 (827) | 30 (207) |
| Yield | ksi (MPa) | 28 (195) | 23 (154) | 60 (413) | 45 (310) |
| Elongation | % in 2" | 30 | 30 | 8 | 40 |
| Applicable Specifications | |||
| Alloy | UNS(1) | ASTM | AMS(2) |
| Efi 79 | K14080 | A753 | N-14411C |
| Efi 50 | K94840 | A753 | N-14411C |
| Efi Cobalt 50 | R30005 | A801 | - |
| Efi Core Iron | - | A848 | - |
| Efi Vac Iron | - | A848 | - |