Ohmalloy Material Co.,Ltd
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Supermalloy magnetic shielding made by permalloy 80 strip Soft Magnetic alloy
Product brief introduction
Ohmalloy-1J79 is a nickel–iron magnetic alloy, with about 80% nickel and 20% iron content. Invented in 1914 by physicist Gustav Elmen at Bell Telephone Laboratories, it is notable for its very high magnetic permeability, which makes it useful as a magnetic core material in electrical and electronic equipment, and also in magnetic shielding to block magnetic fields. Commercial permalloy alloys typically have relative permeability of around 100,000, compared to several thousand for ordinary steel.
Normal composition%
| Ni | 78.5~80.0 | Fe | Bal. | Mn | 0.6~1.1 | Si | 0.3~0.5 |
| Mo | 3.8~4.1 | Cu | ≤0.2 | ||||
| C | ≤0.03 | P | ≤0.02 | S | ≤0.02 |
Typical Mechanical properties
| Yield strength | Tensile Strength | Elongation |
| Mpa | Mpa | % |
| 980 | 1030 | 3~50 |
| The magnetic properties of alloys with high permeability in weak fields | ||||
| 1J79 | Initial permeability | Maximum permeability | Coercivity | Saturation magnetic induction intensity |
| Cold-rolled strip/ sheet. 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 | |
Typical Physical properties
| Density (g/cm3) | 8.6 |
| Electrical resistivity at 20℃(Ωmm2/m) | 0.55 |
| Coefficient of linear expansion(20℃~200℃)X10-6/℃ | 10.3~11.5 |
| Saturation magnetostriction coefficient λθ/ 10-6 | 2.0 |
| Curie point Tc/ ℃ | 450 |
Janey
Ohmalloy Material Co., Ltd
Add: No. 1211, Mudanjiang Road, Baoshan district, Shanghai
Mob./ Whatsapp/wechat/skype: +86-13805769652
Email: tina@ohmalloy.com
