Permalloy 50 / FeNi50 / 1J50 Soft Magnetic Alloy
1J50 Soft Magnetic Alloy 每 High-Permeability Nickel-Iron Precision Alloy for Magnetic Cores, Transformers & Shielding Applications
1J50 (Permalloy 50 / FeNi50) is a nickel-iron soft magnetic alloy containing approximately 50% nickel, renowned for its high magnetic permeability, high saturation magnetic induction (up to 1.55每1.60 T), and low coercivity. As a member of the permalloy family, 1J50 occupies a unique "power-sensitivity balance zone" among soft magnetic materials〞offering significantly higher saturation induction than 80% Ni permalloys like 1J85, while maintaining good permeability and lower cost. This makes it the material of choice for magnetic cores, transformers, inductors, sensors, magnetic shielding, and precision instruments across electronics, telecommunications, aerospace, and defense industries.
As a professional Chinese precision alloy manufacturer, ZYTC Alloy provides certified 1J50 soft magnetic alloy in strip, sheet, plate, bar, and wire forms, with full material traceability and EN 10204 3.1 / 3.2 inspection certificates. We recently delivered ultra-precision 1J50 alloy strips (0.3mm ℅ 215mm) to a leading Korean electronics manufacturer for EMI shielding components in next-generation smartphones.
1. International Equivalents & Standards
1J50 is recognized under multiple international standards, ensuring global supply chain compatibility:
| Country | Standard / Designation |
|---|---|
| China (GB) | 1J50 (GB/T 15018, GB/T 14986) |
| USA (ASTM) | Permalloy 50 / Alloy 4750 (UNS N14080) |
| Germany (DIN) | 1.3922 |
| Japan (JIS) | PB-2 (formerly PB) |
| Russia (GOST) | 50H |
| UK (BS) | Perminvar 50 |
| EU | FeNi50 |
2. Chemical Composition
1J50 is a nickel-iron binary alloy with tightly controlled impurities to achieve its superior magnetic properties. The nickel content of 49每51% provides the foundation for high magnetic permeability, while low carbon and silicon content ensure minimal magnetic aging.
| Element | Weight % (Min) | Weight % (Max) |
|---|---|---|
| Nickel (Ni) | 49.0 | 51.0 |
| Iron (Fe) | Balance | Balance |
| Manganese (Mn) | 0.30 | 0.60 |
| Silicon (Si) | 0.15 | 0.30 |
| Carbon (C) | 〞 | 0.03 |
| Phosphorus (P) | 〞 | 0.020 |
| Sulfur (S) | 〞 | 0.020 |
| Copper (Cu) | 〞 | 0.20 |
3. Physical Properties
| Property | Metric | Imperial | Note |
|---|---|---|---|
| Density | 8.2 每 8.7 g/cm³ | 0.296 每 0.314 lb/in³ | Varies by source |
| Melting Point | ~1430∼C | ~2606∼F | 〞 |
| Curie Temperature | 485 每 530∼C | 905 每 986∼F | High thermal stability |
| Electrical Resistivity | 0.45 每 0.55 米次﹞m | 〞 | 〞 |
| Coefficient of Thermal Expansion (20每100∼C) | 8.4 ℅ 10⁻⁶ /∼C | 4.7 ℅ 10⁻⁶ /∼F | 〞 |
| Saturation Magnetostriction | ~25 ℅ 10⁻⁶ | 〞 | 〞 |
4. Mechanical Properties
1J50 offers good mechanical properties that support reliable fabrication and long-term service in demanding applications.
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength (Annealed) | 450 每 550 MPa | 65 每 80 ksi |
| Yield Strength (0.2% offset) | 150 每 250 MPa | 22 每 36 ksi |
| Elongation | 30 每 37% | 30 每 37% |
| Hardness (Brinell) | 130 每 170 HB | 130 每 170 HB |
| Hardness (Vickers) | 130 每 160 HV | 130 每 160 HV |
5. Magnetic Properties
1J50's magnetic properties are optimized through precise heat treatment (typically 1100每1200∼C hydrogen annealing followed by controlled cooling). The alloy exhibits excellent initial and maximum permeability with high saturation induction.
| Property | Value | Unit | Note |
|---|---|---|---|
| Saturation Magnetic Induction (Bs) | 1.55 每 1.60 | T (Tesla) | ~2℅ higher than 80% Ni permalloys |
| Initial Permeability (米i) | ≡ 4,000 | 〞 | High sensitivity to weak signals |
| Maximum Permeability (米max) | 60,000 每 80,000 | 〞 | 〞 |
| Coercivity (Hc) | ≒ 12.8 | A/m | Low hysteresis loss |
| Remanence (Br) | 0.6 每 0.8 | T | Reducible with magnetic field annealing |
6. Key Performance Advantages
High Magnetic Permeability: 1J50 offers excellent initial and maximum permeability, enabling efficient magnetic coupling in transformers, inductors, and sensors.
High Saturation Induction: With Bs reaching 1.55每1.60 T, 1J50 provides approximately twice the saturation flux density of 80% nickel permalloys, making it resistant to magnetic saturation in high-power applications.
Low Coercivity: Low coercivity (≒ 12.8 A/m) ensures minimal hysteresis loss and rapid magnetic reversal.
Good Thermal Stability: The Curie temperature of 485每530∼C ensures stable magnetic performance at elevated operating temperatures.
Excellent Machinability: 1J50 is easy to process and shape, enabling the manufacture of complex precision components.
Cost-Effective: With approximately 50% nickel content, 1J50 offers a more economical solution compared to higher-nickel permalloys (1J79, 1J85) while delivering excellent performance for many applications.
7. Applications
1J50's combination of high permeability, high saturation induction, and good cost-effectiveness makes it the preferred material for:
Electronics & Electrical:
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Magnetic cores for current transformers, power transformers, and pulse transformers
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Choke coils, inductors, and magnetic amplifiers
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Magnetic shielding enclosures for sensitive electronic equipment
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Micro-motors, relays, and electromagnetic clutches
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Recording heads and magnetic sensors
Telecommunications:
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Signal amplifiers and antennas
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Precision communication components
Aerospace & Defense:
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Avionics gyroscopes and navigation instruments
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Satellite communication equipment
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Aerospace sensors and permanent magnets
Precision Instrumentation:
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Precision measuring instruments and meters
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Pressure-sensitive diaphragms and elastic elements
Industrial:
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Small power transformers and reactor cores
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Industrial rectifier equipment
8. Available Product Forms & Dimensions
ZYTC Alloy supplies 1J50 soft magnetic alloy in multiple product forms to meet diverse manufacturing requirements:
| Product Form | Dimension Range | Condition |
|---|---|---|
| Strip / Foil | Thickness: 0.05mm 每 2.0mm; Width: 10mm 每 300mm | Annealed, precision cold-rolled |
| Sheet / Plate | Thickness: 2.0mm 每 20mm | Annealed |
| Bar / Rod | Custom diameters | Annealed or cold-drawn |
| Wire | Precision diameters | Annealed or cold-drawn |
| Custom Shapes | Upon request | As specified |
All products are supplied with full mill test reports (MTR) documenting chemical composition, mechanical properties, magnetic performance, and heat treatment records.
9. Why Choose ZYTC Alloy for 1J50 Precision Alloy?
ZYTC Alloy is a leading AS9120B and ISO 9001 certified precision alloy manufacturer and supplier based in China, with over 30 years of experience in the specialty metals industry.
Our Advantages:
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✅ AS9120B & ISO 9001 certified 每 rigorous quality management
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✅ GB/T 15018 & ASTM A753 compliant materials
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✅ Full material traceability from melt to delivery
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✅ EN 10204 3.1 / 3.2 inspection certificates available
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✅ Precision dimensional control for critical applications
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✅ Multiple product forms: strip, sheet, plate, bar, wire, custom shapes
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✅ Custom processing: precision slitting, cutting, and heat treatment services
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✅ Proven track record: recent delivery of ultra-precision 1J50 strips to Korean electronics manufacturer
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✅ Competitive factory pricing with no intermediaries
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✅ Fast global delivery from ex-stock inventory
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✅ Technical support from experienced metallurgists
Contact ZYTC Alloy Today
📧 Email: dominic@zytc-steel.com
📲 WhatsApp: +86 13132148618