Mu-Metal / HY-MU 80 / 1J79 Soft Magnetic Shielding Alloy
Mu-Metal / HY-MU 80 / 1J79 Soft Magnetic Shielding Alloy
每 High-Permeability Solutions from ZYTC Alloy
ZYTC Alloy is a leading Chinese manufacturer and global supplier of high-performance precision alloys, nickel-based superalloys, and specialty metals. With over 30 years of industry experience, integrated manufacturing capabilities, and AS9120:2016 / ISO 9001:2015 certifications, we deliver precision-engineered materials for the world's most demanding applications.
Mu-Metal (also known as HY-MU 80, 1J79, Permalloy 79, or 79HM) is a nickel-iron soft magnetic alloy containing approximately 80% nickel with additions of molybdenum and iron. This alloy is renowned for its extremely high initial permeability, making it the premier choice for magnetic shielding applications where protection from external magnetic fields is critical.
ZYTC Alloy supplies 1J79 / Mu-Metal in multiple product forms 每 including sheet, strip, bar, rod, and tube 每 all manufactured and tested to meet rigorous international standards such as ASTM A753-78 and ASTM 596. Whether you require standard stock or custom-fabricated components, our team is ready to support your magnetic shielding and transformer core requirements.
Chemical Composition |
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| Weight% | Ni | Cu | Cr | S | P | Si | Mn | C | Mo | Fe |
| Hymu 80 (Comp1) | 79.0-80.6 | 0.008 | 0.02 | 0.42 | 0.95 | 0.03 | 3.8-5 | Rem | ||
| MIL N 14411C (Comp2) | 75.0-77.0 | 4.0-6.0 | 3.0 | 0.02 | 0.02 | 0.50 | 1.8 | 0.05 | ||
Typical Mechanical Properties
| Mu-Metal | ||
| Yield Strength (psi) | Tensile Strength (psi) | Elongation in 2" (%) |
| 44,000 | 100,000 | 40 |
| Mechanical Properties in the Annealed Condition | ||
Physical Properties (Annealed Condition)
| Property | Value |
|---|---|
| Specific Gravity | 8.7 g/cm³ |
| Density | 0.316 lb/in³ |
| Curie Temperature | 410∼C (830∼F) |
| Electrical Resistivity | 0.55 米次﹞m (349 ohm circ mil/ft) |
| Thermal Conductivity | 0.32 W/cm﹞∼C (134 btu-in/ft²﹞h﹞∼F) |
| Coefficient of Thermal Expansion | 13 ℅ 10⁻⁶ /∼C (7.2 ℅ 10⁻⁶ /∼F) between 30每204∼C |
| Minimum DC Permeability (米) | 80,000 at 40 gauss (after proper heat treatment) |
Corresponding and Similar Grades
| Standard / Region | Grade Name |
|---|---|
| China (GB/T 15018) | 1J79 |
| USA (ASTM A753-78) | HY-MU 80, Permalloy 79 |
| Military Standard | MIL N 14411 C, COMP. 1 |
| Commercial | MAG 7904 |
| Russia (GOST) | 79HM |
| Germany (DIN) | Permalloy 80 |
| Japan (JIS) | PC-80 |
| United Kingdom | Mumetal (Original) |
Note: Mu-Metal is the original British trademark for this alloy family, while HY-MU 80 is the equivalent grade widely used in the United States. All designations refer to the same 80% nickel-iron-molybdenum soft magnetic alloy.
Availability & Product Forms
ZYTC Alloy offers Mu-Metal / 1J79 in the following product forms:
| Form | Typical Applications |
|---|---|
| Sheet | Magnetic shields, enclosures, transformer laminations |
| Strip | Wrap-around shields, tape-wound cores |
| Bar / Rod | Machined components, specialized core parts |
| Tube | Shielding for cables and sensors |
| Custom Fabricated Parts | Made-to-print components, precision shields, enclosures |
Applications
- Magnetic shielding housings for sensors, electronic instruments, medical devices and aerospace assemblies
- High‑performance transformer and toroidal core components
- Precision magnetic‑field shielding for laboratory and defence‑grade electronics
- Magnetic shielding for communication equipment and navigation systems
Quality Assurance at ZYTC Alloy
We strictly enforce standardized, process-driven, and professionally managed production and inspection procedures:
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Raw Material Verification 每 Spectrometric analysis to confirm chemical composition
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Precision Heat Treatment 每 Controlled annealing in hydrogen atmosphere to achieve optimal magnetic properties
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Magnetic Property Testing 每 Permeability measurement per ASTM 596
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Dimensional Inspection 每 Precision measurement of all critical tolerances
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Mechanical Testing 每 Tensile, hardness, and formability verification
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Non-Destructive Testing 每 Visual inspection and surface quality control
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Complete Traceability 每 Full documentation from melt to shipment
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Third-Party Support 每 SGS, BV, TUV, and client-inspectors
Contact ZYTC Alloy
For Mu-Metal / 1J79 / HY-MU 80 inquiries 每 including technical datasheets, mill test certificates, sample requests, or custom manufacturing quotes 每 please contact us today.
📧 Email: dominic@zytc-steel.com
📲 WhatsApp/WeChat: +86 13132148618