Permalloy 80 (N14080 / HyMu 80) – Premium Soft Magnetic Alloy

Permalloy 80 delivers permeability up to 100 000 with near‑zero magnetostriction, ideal for EMI shielding & precision sensor cores.
ZYTC Alloy — China reliable supplier of Mumetal foil, strip, bar & custom stamped components, full ASTM compliant with hydrogen annealing service.

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ZYTC Alloy | China Professional Soft Magnetic Alloy Supplier

Permalloy 80, also widely known as Mumetal or Chinese grade 1J85, is a vacuum‑melted nickel‑iron‑molybdenum soft magnetic alloy, composed of approximately 80 % nickel, 15 % iron and 5 % molybdenum. Boasting ultra‑high relative permeability up to 100 000 — vastly outperforming ordinary carbon steel — this material delivers top‑tier magnetic performance under low‑magnetic‑field conditions.

Near‑zero magnetostriction and notable anisotropic magnetoresistance make Permalloy 80 the material‑of‑choice for precision magnetic cores and high‑performance EMI shielding components.

As a leading Chinese soft magnetic alloy manufacturer, ZYTC Alloy supplies fully traceable Permalloy 80 semi‑finished products for global electronics, defence, instrumentation and aerospace projects.

Product Forms Available at ZYTC Alloy

ZYTC Alloy provides Permalloy 80 (Mumetal /1J85) in multiple dimensions: ultra‑thin foil, precision slit strip, round bar, flat plate, tube, custom‑stamped laminations and pre‑machined blanks. In‑house hydrogen annealing service is available to deliver parts with finished magnetic properties.

Under low‑intensity magnetic fields, Permalloy 80 achieves exceptional initial & maximum permeability, paired with low coercivity, minimal hysteresis loss and low eddy‑current loss. Its near‑zero magnetostriction characteristic is extremely valuable for thin‑foil assemblies; it prevents dramatic magnetic‑property drift induced by mechanical stress, a common failure point for many other magnetic alloys. Thanks to vacuum melting technology, Permalloy 80 enables miniaturisation and weight reduction of magnetic cores and shielding housings for high‑end equipment.

Critical Annealing Note for Maximum Magnetic Performance To unlock Permalloy 80’s full magnetic capacity, final hydrogen annealing must be completed after all machining, stamping and forming operations. Standard process: 4 hours soaking at 1120 °C‑1160 °C under dry pure hydrogen atmosphere (‑40 °C dew point). Controlled cooling rate of 3‑7 °C/min within 700 °C down to 300 °C is required. Post‑annealed parts are highly stress‑sensitive; avoid bending, impact and heavy mechanical load to preserve optimal permeability.

Applications

High‑performance EMI / RFI magnetic shielding: shielding cases, shielding foils for sensors, communication modules and medical electronics
Precision magnetic cores for current transformers, flux‑gate sensors and weak‑signal instrument sensors
Aerospace & defence electronic assemblies, magnetic pick‑up components
High‑end audio transducer cores, high‑sensitivity magnetic detectors
Hermetic electronic packaging internal magnetic functional parts

Chemical Composition (ASTM A753 Type 4)

Element	Content Range
Nickel (Ni)	79.0 – 82.0%
Molybdenum (Mo)	3.5 – 6.0%
Iron (Fe)	Balance
Manganese (Mn)	≤ 0.95%
Silicon (Si)	≤ 0.30%
Carbon (C)	≤ 0.03%
Phosphorus (P)	≤ 0.02%
Sulfur (S)	≤ 0.02%
Copper (Cu)	≤ 0.08%

The addition of molybdenum is critical—it increases electrical resistivity, reduces eddy current losses, and enhances magnetic stability.

Mechanical Properties (Annealed Condition)

Property	Value
Tensile Strength, Ultimate	≥ 517 MPa (75,000 psi)
Tensile Strength, Yield	145 – 310 MPa (21,000 – 45,000 psi)
Elongation	2 – 40% (depending on temper)
Hardness (Rockwell B)	58 – 80 HRB
Density	8.74 g/cm³ (0.316 lb/in³)
Curie Temperature	410°C (830°F)
Thermal Conductivity	0.32 W/cm·°C

Key Features from ZYTC Alloy

✅Elite magnetic performance: Ultra‑high permeability, low hysteresis & eddy‑current losses, near‑zero magnetostriction. Delivers stable inductance and anti‑saturation capability for compact, energy‑efficient magnetic assemblies.

✅Excellent manufacturability: Good ductility enables ultra‑thin foil, precision strip, bar and custom stamping parts. Satisfactory welding performance for shielding box assembly.

Important reminder: Magnetic properties are highly sensitive to mechanical stress. Any deformation, collision after final hydrogen annealing will degrade permeability.
✅Good ambient corrosion resistance: High‑nickel formulation offers decent rust resistance under general working conditions; extra anti‑rust coating is usually unnecessary for indoor or moderate‑humidity environments.
✅Flexible grade portfolio: ZYTC Alloy supplies full series Ni‑Fe soft magnetic alloys covering 35‑40 %Ni, 45‑50 %Ni, 50‑65 %Ni and 70‑81 %Ni grades. Magnetic hysteresis loops can be tuned via melting and heat‑treatment parameters to match client‑specific working conditions.

Quality Compliance

All Permalloy 80 batches are produced to ASTM A753, GB/T 15018 and UNS standards. Each shipment comes with complete Mill Test Reports (MTR) covering chemical composition, magnetic testing and mechanical properties. Third‑party inspection is supported upon request.

Whether you need small‑batch prototype foils or large‑volume strip for mass production, ZYTC Alloy, the trusted Chinese soft magnetic alloy supplier, delivers consistent quality and full‑chain technical support for your soft‑magnetic projects.

📧 Email: daisy@zytcsteel.com
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