HyMu 50 Permalloy 50 Bar (W.Nr. 1.3922 / FeNi50)
Product Introduction
HyMu 50 (UNS N14080, W.Nr. 1.3922, Permalloy 50, FeNi50, 1J50) is a soft magnetic iron-nickel alloy containing approximately 50% nickel. It features a higher saturation magnetic induction and is resistant to magnetic saturation.
HyMu 80 is an advanced variant of HyMu 50; due to its chemical composition-which contains approximately 80% nickel-it offers higher sensitivity, making it a more expensive option. However, it has a drawback: it saturates in relatively weak magnetic fields, meaning it cannot "capture" signals once they exceed a certain intensity. In contrast, Permalloy 50 possesses a significantly higher saturation magnetic induction and does not easily saturate under strong magnetic fields; consequently, it is better suited than HyMu 80 for applications such as current transformer cores and high-power transformer cores.
Its typical applications include: current transformer cores, medium-power transformers, magnetic amplifiers, electromagnetic clutches, magnetic shielding enclosures (for scenarios where shielding requirements are not extremely stringent but cost-effectiveness is a priority), and relay cores.
Supply of Standard Grades, Product Forms, and Conditions
1. Standards and Grades：
W.Nr. 1.3922 (German Standard; Commonly Supplied)
FeNi50 (Chemical Composition Designation)
UNS N14080 (Unified Numbering System)
1J50 (Chinese National Standard Grade)
Alloy 4750 / Permalloy 50 (U.S. Commercial Grade)
2. Product Form and Status：
Prior to purchasing HyMu 50 alloy bars, we will discuss detailed technical material specifications-including dimensions, delivery condition, and intended application:
Dimensions: Diameter, Length
Condition: Annealed (Soft) or Cold-Drawn (Hard)?
Heat Treatment Requirements: Is the supplier required to perform the final annealing?
Recommendations for Selecting the Condition:
For applications involving extensive machining and subsequent in-house heat treatment → Select the Annealed condition.
For structural components intended for direct use (without specific magnetic property requirements) → The Cold-Drawn condition may be selected (offers higher strength).
For small-batch orders where in-house heat treatment facilities are unavailable → Inquire with the supplier whether they can perform the final annealing before shipment.
3. Price Reference
The price of HyMu 50 is higher than that of standard stainless steel, yet significantly lower than that of HyMu 80 (due to a 30% lower nickel content). Pricing is primarily influenced by several factors:
Nickel Prices: With a nickel content of 50%, fluctuations in LME nickel prices directly impact material costs.
Dimensions: Large-diameter bars are more expensive than small-diameter bars (due to the increased difficulty of the forging process).
Condition: The annealed condition is more expensive than the cold-drawn condition (as it requires an additional heat treatment step).
Quality Grade: Military/high-end industrial grades are more expensive than standard commercial grades.
Based on current market conditions, Lork Group provides the following approximate price estimates:
$80–$100 USD (MOQ: 200 kg) - Custom Products
$40–$60 USD (MOQ: 100 kg) - Standard Products
$60–$80 USD (MOQ: 50 kg) - Standard Products (requiring minor processing)
Packaging and shipping costs are typically negotiated on a case-by-case basis!
4. Sample Testing:
As a general principle, we recommend that customers "request samples for testing first"-particularly for experimental applications involving critical magnetic circuits. We suggest that customers initially purchase small samples to conduct magnetic performance tests, and only place a large-scale order once they have confirmed that the data meets the required standards.
Special reminder: The standard delivery condition for our bars is the annealed state; however, cold-drawn bars are also available. Based on our experience, if customers intend to process the material directly into finished parts for immediate use, the annealed state is generally preferred. Conversely, if customers plan to perform their own annealing treatment after processing, the cold-drawn state is acceptable.
Processing difficulty and key points
Like HyMu 80, the soft magnetic properties of HyMu 50 are developed through heat treatment. Processing stresses completely disrupt the magnetic domain structure; therefore, a final annealing step is essential to restore these properties.
welding：
HyMu 50 can be welded, but it absolutely requires re-annealing after the process. The heat generated during welding disrupts the magnetic domain structure; without subsequent annealing, the magnetic permeability of the material in the vicinity of the weld will be essentially ruined.
Machining and Welding：
The machinability of HyMu 50 is similar to that of austenitic stainless steel; it does not work-harden as rapidly and is, overall, somewhat easier to work with than HyMu 80.
1. Hot Working - Wide temperature window
2. Cold Working - Deformation levels can reach 80–90%
For more information, please contact:
Email: susan@lorkgroup.com
WhatsApp: +86 19937075488
Chemical Composition
(Refer to FeNi50 / W.Nr. 1.3922 / 1J50 standards)
| Weight% | Permalloy 50 |
| Ni | 49.0-51.0% |
| Mn | 0.30-0.60% |
| Fe | Remaining (~48–49%) |
| Si | 0.15-0.30% |
| C / P / S | trace amounts |
Molybdenum (Mo) content can be optionally added within the range of 0.3% to 0.5%. This addition is specifically requested by some clients for high-purity grades, primarily to increase electrical resistivity.
Physical Properties
(Annealed Condition, Typical Values for Rods)
| Material | Reference value |
| Resistivity | Approx. 0.45 μΩ·m |
| Curie Temperature | Approx. 500°C |
| Coefficient of Thermal Expansion (20–100°C) | Approx. 9.2 × 10⁻⁶/°C |
| Thermal Conductivity | Approx. 25 W/(m·K) |
| Saturation Magnetostriction Coefficient | Approx. 25 × 10⁻⁶ |
Note: Actual magnetic properties vary significantly depending on the diameter of the HyMu 50 rods, the temperature uniformity of the heat treatment furnace, and the cooling rate. Process validation must be conducted prior to mass production.
Magnetic Properties
| Performance Metrics | HyMu 50 | HyMu 80 | illustrate |
| Saturation Magnetic Induction (Bs) | 1.55-1.60 T | 0.80 T | 50 is twice that of 80 |
| Initial Permeability (μ₀) | ~6,000 | ~50,000 | 80 is more sensitive |
| Maximum Permeability (μ_max) | ~80,000 | ~200,000 | The peak is higher at 80 |
| Coercivity (Hc) | ≤12 A/m | ≤1.6 A/m | 80 is more prone to demagnetization |
| Curie temperature | ~500℃ | 461℃ | 50 offers superior thermal stability |
Lork Group Selection Recommendation: The choice depends on the specific operating conditions-for weak signals or applications requiring extremely high sensitivity, select the Model 80; for signals of moderate strength or scenarios requiring resistance to saturation, select the Model 50. The saturation magnetic induction of the Model 50 is twice that of the Model 80, ensuring that it will not fail due to "magnetic saturation" in high-current or high-power environments.
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