Permalloy 80 not hardenable by heat treatment. Annealing can be performed in a dry hydrogen atmosphere at 1176°C (2150° F) for 4 h, followed by furnace cooling to 593°C (1100°F), and then a cooling rate of 260°C (500°F)/ h from 593 to 372°C (1100 to 700°F). Air cooling should be done to 372°C (700°F). Strain relief annealing can be performed at 927°C (1700°F) for 1/2 h in a dry hydrogen or inert gas atmosphere.
Alloy grade | Ni | Fe | Si | Mn | Cu | S | P | C | Mo |
Ni50 | 49.0~51.0 | Bal. | 0.15~0.3 | 0.3~0.6 | ≤0.2 | ≤0.02 | ≤0.02 | ≤0.03 | - |
Ni79Mo4 | 78.5~80.0 | Bal. | ≤1.0 | 0.6~1.1 | ≤0.2 | ≤0.02 | ≤0.02 | ≤0.03 | 3.8~4.1 |
Ni80Mo5 | 79.0~81.0 | Bal. | ≤1.5 | 0.3~0.6 | ≤0.2 | ≤0.02 | ≤0.02 | ≤0.03 | 4.8~5.2 |
|
Ni79Mo4 | Initial permeability | Maximum permeability | Coercivity | Saturation magnetic induction | ||
Cold rolled strip/plate Thickness, mm | μ0.08/ (mH/m) | μm/ (mH/m) | Hc/ (A/m) | BS/ T | ||
≥ | ≤ | |||||
0.01 mm | 17.5 | 87.5 | 5.6 | 0.75 | ||
0.1~0.19 mm | 25.0 | 162.5 | 2.4 | |||
0.2~0.34 mm | 28.0 | 225.0 | 1.6 | |||
0.35~1.0 mm | 30.0 | 250.0 | 1.6 | |||
1.1~2.5 mm | 27.5 | 225.0 | 1.6 | |||
2.6~3.0 mm | 26.3 | 187.5 | 2.0 | |||
Cold drawn wire | | |||||
0.1 mm | 6.3 | 50 | 6.4 | |||
Bar | | |||||
8-100 mm | 25 | 100 | 3.2 |
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