1J85 is a nickel-iron-molybdenum soft magnetic alloy, commonly referred to as permalloy, engineered for exceptional magnetic performance in low-intensity fields. With a high nickel content (approximately 80%) and controlled molybdenum addition, it achieves outstanding initial and maximum magnetic permeabilities, high saturation magnetic induction, and extremely low coercivity. This austenitic alloy minimizes hysteresis loss, eddy current loss, and magnetostriction, making it highly responsive to weak signals. It is widely used in precision magnetic components such as transformer cores, magnetic shields, recording heads, and sensitive instrumentation .
1. Product Specifications & Physical Data1J85 Soft Magnetic Alloy is available in sheet, strip, wire, and bar forms for magnetic component manufacturing requiring high permeability and low core loss. Available Forms: Sheet, strip, wire, bar, and custom laminations . Specifications: GB/T 32286, ASTM A753 (Alloy 4), UNS N14080 .
| Chemical Composition (Weight %) | 1J85 Specification |
|---|
| Nickel (Ni) | 79.0 - 81.0 | | Molybdenum (Mo) | 4.0 - 5.0 | | Iron (Fe) | Balance | | Manganese (Mn) | 0.30 - 0.60 | | Silicon (Si) | 0.15 - 0.30 | | Carbon (C) | 0.03 max. | | Sulfur (S) | 0.02 max. | | Phosphorus (P) | 0.02 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.75 g/cm³ | 0.316 lb/in³ | | Melting Range | 1395 - 1425°C | 2540 - 2600°F | | Electrical Resistivity | 0.56 µΩ·m | 0.56 µΩ·m | | Coefficient of Thermal Expansion | 0.5 × 10⁻⁶/°C | 0.28 × 10⁻⁶/°F | | Curie Temperature | 450°C (approx.) | 842°F (approx.) |
| Mechanical Properties (Annealed) | Metric | Imperial |
|---|
| Tensile Strength | 560 MPa | 81 ksi | | Yield Strength (0.2% offset) | 600 MPa | 87 ksi | | Elongation | 35% | 35% | | Hardness (Annealed) | 130 - 240 HB | 130 - 240 HB |
| Magnetic Properties (Annealed in Hydrogen) | Value | Unit |
|---|
| Initial Permeability (µi) | ≥ 30,000 | - | | Maximum Permeability (µm) | ≥ 150,000 | - | | Saturation Magnetic Induction (Bs) | 0.75 - 0.80 T | 7500 - 8000 G | | Coercivity (Hc) | ≤ 1.2 A/m | ≤ 0.015 Oe | | Hysteresis Loss | Very Low | - |
2. Fabrication & Material ComparisonAnnealing: Critical step—heat treat at 1150-1200°C (2100-2190°F) in dry hydrogen atmosphere, slow cool to optimize permeability and minimize coercivity . Forming: Good ductility permits stamping, punching, and laminating for transformer cores and magnetic shields . Machining: Requires sharp tools and positive feeds; work-hardening tendency moderate . Material Comparison:
| Property Comparison | 1J85 (Permalloy) | 1J50 (50Ni-Fe) | Silicon Steel | Amorphous Metal |
|---|
| Initial Permeability | ≥ 30,000 | 5,000 - 10,000 | 500 - 5,000 | 20,000 - 80,000 | | Maximum Permeability | ≥ 150,000 | 30,000 - 60,000 | 10,000 - 50,000 | 100,000 - 500,000 | | Saturation Induction (T) | 0.75 - 0.80 | 1.5 - 1.6 | 1.8 - 2.0 | 1.5 - 1.7 | | Coercivity (A/m) | ≤ 1.2 | 8 - 16 | 20 - 80 | 0.5 - 4 | | Electrical Resistivity (µΩ·m) | 0.56 | 0.45 | 0.45 - 0.60 | 1.2 - 1.4 | | Typical Applications | Sensitive magnetic cores, magnetic shields, recording heads | Transformer cores, relays | Motor laminations, transformers | High-efficiency transformers |
3. ApplicationsMagnetic Shielding: Shielding for sensitive electronic equipment, cathode ray tubes, and MRI rooms Precision Transformers: Instrument transformers, current transformers, and pulse transformers Magnetic Recording Heads: Read/write heads for data storage devices Sensors & Transducers: Fluxgate magnetometers, Hall effect sensors, magnetic field sensors Inductors & Chokes: High-frequency inductors requiring low core loss Aerospace & Defense: Inertial navigation systems, magnetic compasses, avionics
Contact ZYTC Alloy for certified 1J85 permalloy materials with complete traceability, GB/T 32286 specifications, technical datasheets, and competitive pricing on standard sheet, strip, and bar sizes. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
