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1J79 is a Iron-Nickel-Molybdenum alloy with the Nickel and Molybdenum content are about 79% and 4% respectively, and possesses high permeability combined with low coercivity and core losses, which makes this soft iron alloy been used widely in laminated cores for instrument transformers, sensors, magnetic amplifiers and shielding, and supplied as sheets, wires, tubes and bars.
| C | Si | Mn | Ni | Mo | Fe |
| 0.03 | 0.35 | 0.45 | 79 | 4 | Bal. |
| Density (g/cm3) | Melting T (℃) | Curie T (℃) | Thermal expansion (10-6/K) | Resistivity (µΩ·cm) | Thermal conduction (W/m·K) |
| 8.6 | 1440 | 440 | 12 | 55 | 18 |
| State | Hardness(HV) | Rp0.2 (MPa) | Rm (MPa) | A (%) | |
| Forged | Forged | 195 | 420 | 710 | 38 |
| Fully-annealed | 100 | 135 | 425 | 35 | |
| Sheet | Cold-rolled | 335 | 1090 | 1110 | 3.0 |
| Fully-annealed | 130 | 425 | 30 | 100 | |
| Mill-annealed | 150 | 235 | 65 | 40 |
* The test shall be conducted in accordance with GB/T 4340.3, GB/T 228, and GB/T 22315 standards.
| Dimension (mm) | μ0 | μm | Hc (A/m) | Bs (T) | |
| Forged | Φ45 | 60 | 225 | 0.9 | 0.82 |
| Sheet | 0.50 | 75 | 550 | 0.6 | 0.81 |
* The ring sample was tested after heat treatment at 1180°C×5h in pure hydrogen atmosphere; μ0 was measured at H = 0.08A/m; Bs was measured at H = 800A/m.
0.5mm Strip loss curve
1.0mm Strip loss curve
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