HyMu 80 / Permalloy 80 Bar
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HyMu 80 (Permalloy 80) High Permeability Soft Magnetic Alloy Bar | ZYTC Alloy
ZYTC Alloy, a professional Chinese manufacturer and supplier of high-end precision soft magnetic alloys, provides premium HyMu 80 (Permalloy 80) nickel-iron-molybdenum alloy bars. As an unoriented 80% nickel-based soft magnetic alloy, HyMu 80 features ultra-high initial permeability, maximum saturation permeability and extremely low hysteresis loss. Renowned for ultra-sensitive magnetic response and compact magnetic circuit performance, it is the ideal material for high-precision weak-signal detection, miniaturized transformer components and high-efficiency magnetic shielding systems.
Material Core Characteristics & Application Orientation
HyMu 80 is a high-purity nickel-iron-molybdenum soft magnetic alloy optimized for low magnetic loss and high-sensitivity magnetic induction. Compared with conventional soft magnetic materials, it delivers unparalleled low hysteresis loss and superior magnetic permeability, enabling miniaturization, lightweight design and high-precision operation of magnetic components. Different from HyMu 50 (FeNi50) which focuses on anti-saturation performance under strong magnetic fields, HyMu 80 excels at capturing weak magnetic signals, making it dominant in high-precision electronic and sensitive sensing scenarios.
HyMu 80 bar stock is mainly processed into two categories of core industrial components: high-precision magnetic functional parts and professional magnetic shielding structures. It is widely applied in scenarios requiring high sensitivity, compact size and stable low-loss magnetic performance.
Main Industrial Applications
- High-precision transformer cores, tape-wound toroids and precision laminations
- Miniaturized electromagnetic components with strict size and weight limitations
- Magnetic shielding enclosures for precision electronic equipment, isolating stray magnetic field interference
- Sensor probes, pole pieces and high-sensitivity relay cores
- Aerospace, defense and military standard magnetic circuit components
Industry Standards & Equivalent Grades
ZYTC Alloy＊s HyMu 80 products fully comply with global mainstream military, industrial and national standards, supporting multi-industry certification and procurement requirements:
-
Alloy 8: Core international standard for nickel-iron soft magnetic alloys (Distinct from Alloy 4 with different chemical composition)
- MIL-N-14411 C Composition 1: US military standard, widely used in aerospace and defense supply chains
- GB/T 15018: Chinese national standard, equivalent to 1J79 / 1J85 high-precision soft magnetic grades
- Custom specifications: Strictly manufactured according to customer engineering drawings and customized technical parameters
Product Specifications & Delivery Conditions
Dimension Range
ZYTC Alloy provides full-size customized and stock HyMu 80 round bars, covering diverse processing and application needs:
- Diameter: 朴6 mm 每 朴500 mm
- Small diameter bars (≒20 mm): Cold-drawn bright finish, smooth surface, high dimensional accuracy for direct precision machining
- Medium & large diameter bars: Hot-rolled / forged black bars, suitable for secondary turning and customized processing
- Length: Standard length 2每6 meters, supporting fixed-length customization and random-length delivery as required
- Straightness: Customizable straightness tolerance per meter for slender rods to meet high-precision assembly requirements
Available Delivery Status
- Annealed (Standard): Default delivery condition with complete stress relief and optimal basic magnetic performance, suitable for direct processing into finished magnetic components
- Cold-Drawn (Hard): High mechanical strength, reserved for customers with independent post-processing annealing procedures
Chemical Composition
Weight%
Permalloy Alloy
Ni
79.0-81.0%
Mo
3.8-5.0%
Fe
14-16%
Si
≒0.5%
C / Cu
trace amounts
Mechanical Properties
(Annealed Condition, Typical Values for Rods)
Material
Reference value
Tensile Strength
≡690 MPa (100,000 psi)
Yield Strength (0.2%)
≡303 MPa (44,000 psi)
Elongation
≡40%
Hardness
≒80 HRB
In the annealed state, it is very soft, facilitating machining.
Physics and magnetic properties (this is the core)
Performance Specification
Typical Values
Initial permeability (米i)
20,000 - 50,000
Maximum Permeability (米m)
100,000 - 200,000
Coercivity (Hc)
0.637 - 1.59 A/m
Saturation Magnetic Induction (Bs) Approx
0.75 - 0.8 T
Resistivity (老)
55-58 米次﹞cm
Important Reminder: Magnetic properties-rather than mechanical properties-constitute the primary basis for acceptance testing. We provide actual test reports detailing the measured magnetic properties; typically, these tests are conducted in accordance with ASTM A596 or A773 standards. If a supplier states, "We guarantee only the chemical composition, not the magnetic properties," we strongly advise exercising extreme caution before purchasing such materials.
Chemical Composition
| Weight% | Permalloy Alloy |
| Ni | 79.0-81.0% |
| Mo | 3.8-5.0% |
| Fe | 14-16% |
| Si | ≒0.5% |
| C / Cu | trace amounts |
| Material | Reference value |
| Tensile Strength | ≡690 MPa (100,000 psi) |
| Yield Strength (0.2%) | ≡303 MPa (44,000 psi) |
| Elongation | ≡40% |
| Hardness | ≒80 HRB |
In the annealed state, it is very soft, facilitating machining.
Physics and magnetic properties (this is the core)
| Performance Specification | Typical Values |
| Initial permeability (米i) | 20,000 - 50,000 |
| Maximum Permeability (米m) | 100,000 - 200,000 |
| Coercivity (Hc) | 0.637 - 1.59 A/m |
| Saturation Magnetic Induction (Bs) Approx | 0.75 - 0.8 T |
| Resistivity (老) | 55-58 米次﹞cm |
Important Reminder: Magnetic properties-rather than mechanical properties-constitute the primary basis for acceptance testing. We provide actual test reports detailing the measured magnetic properties; typically, these tests are conducted in accordance with ASTM A596 or A773 standards. If a supplier states, "We guarantee only the chemical composition, not the magnetic properties," we strongly advise exercising extreme caution before purchasing such materials.
Processing Guidance & Core Technical Notes
The excellent soft magnetic performance of HyMu 80 is not inherent. All magnetic permeability and low-loss characteristics are completely activated and optimized through professional precision heat treatment. Mechanical processing deformation and residual stress will destroy the internal magnetic domain structure, resulting in sharply reduced magnetic performance.
Key Processing Rules
Annealed HyMu 80 bars can be directly processed and used; cold-drawn bars or workpieces with large processing deformation must undergo final annealing treatment to restore standard magnetic properties.
Professional Final Annealing Process (Core Process for Optimal Magnetic Performance)
Heat treatment is the decisive factor determining HyMu 80＊s service performance, with extremely strict process requirements:
- Heating Temperature: 1121∼C 每 1177∼C
- Holding Time: 2 每 4 hours
- Atmosphere Requirement: Must use dry pure hydrogen with dew point ˉ -40∼C; vacuum annealing delivers inferior magnetic performance and is not recommended for high-precision applications
- First-stage Cooling: Furnace cool naturally to 593∼C
- Second-stage Controlled Cooling: Strictly control cooling rate at 194∼C 每 334∼C per hour during cooling from 593∼C to 371∼C
Critical Anti-Pollution Reminder
HyMu 80 high-nickel alloy is extremely sensitive to furnace atmosphere contamination. Sulfur, oxygen and carbon impurities in the annealing environment will cause irreversible damage to the magnetic domain structure, leading to permanent failure of magnetic permeability and hysteresis performance. All annealing processes must be completed in a pure oxygen-free and sulfur-free atmosphere.
Sample Testing Suggestion
For R&D experiments, new project verification and high-precision magnetic circuit applications, ZYTC Alloy strongly recommends sample testing before bulk ordering. Customers can purchase small-batch samples to verify magnetic permeability, hysteresis loss and stability data. Large-scale mass production orders can be arranged only after all technical indicators meet project standards, effectively avoiding batch quality risks.
Why Choose ZYTC Alloy HyMu 80
As a professional Chinese supplier of precision soft magnetic alloys, ZYTC Alloy strictly controls raw material smelting, rolling precision and standardized heat treatment for all HyMu 80 products. We fully follow ASTM, military and national standard processes to ensure consistent high permeability, ultra-low hysteresis loss and stable batch performance. All products are equipped with complete MTR test reports and support third-party authoritative testing. We provide one-stop services including standard stock supply, non-standard customization, precision processing and professional heat treatment guidance for global aerospace, military, electronic precision manufacturing and high-end industrial customers.
Contact Us
For HyMu 80 technical datasheets, sample applications, customized specifications and competitive factory quotations, please get in touch with our professional team:
Email: dominic@zytc-steel.com
WhatsApp: +86 13132148618