Mu-Metal,Hy-Mu 80 ,,E FORU

British Specs:，American Specs:MIL-N-14411 C ASTM A753，German Specs:

### **Mu-Metal / Hy-Mu 80 - Product Overview** **Mu-Metal**, commercially known as **Hy-Mu 80**, is a nickel-iron soft magnetic alloy renowned for its extremely high magnetic permeability and low coercivity. This specialized alloy provides superior magnetic shielding properties, making it ideal for applications requiring protection from low-frequency magnetic interference. * **Common Names:** Mu-Metal, Hy-Mu 80, High Permeability Alloy 80 --- #### **1. Chemical Composition** Precisely controlled chemistry ensures optimal magnetic properties. | Element | Percentage (%) | Role in the Alloy | |:---|:---|:---| | **Nickel (Ni)** | 77.0 - 81.0 | Primary element for high permeability | | **Iron (Fe)** | Balance | Base magnetic element | | **Molybdenum (Mo)** | 4.50 - 5.50 | Enhances permeability and reduces coercivity | | **Copper (Cu)** | 0.10 - 0.30 | Improves corrosion resistance | | **Chromium (Cr)** | 0.10 - 0.30 | Enhances workability | | **Manganese (Mn)** | 0.30 - 0.60 | Deoxidizer and sulfur control | | **Silicon (Si)** | 0.10 - 0.30 | Improves magnetic properties | | **Carbon (C)** | 0.02 max | Minimized for optimal magnetic softness | --- #### **2. Physical Properties** Exceptional magnetic properties optimized for shielding applications. | Property | Value / Condition | Notes | |:---|:---|:---| | **Density** | 8.75 g/cm³ (0.316 lb/in³) | | | **Melting Point** | ~1450 °C (2640 °F) | | | **Curie Temperature** | 410 - 430 °C (770 - 806 °F) | | | **Electrical Resistivity** | 0.58 μΩ·m at 20°C | | | **Thermal Conductivity** | 17 W/m·K at 20°C | | | **Thermal Expansion Coefficient** | 12.5 μm/m·°C (20-300°C) | | | **Specific Heat** | 0.46 J/g·°C at 20°C | | --- #### **3. Magnetic Properties** **Exceptional Magnetic Characteristics:** * **Initial Permeability (μi):** 30,000 - 50,000 (at 0.002T) * **Maximum Permeability (μmax):** 100,000 - 300,000 * **Saturation Induction (Bs):** 0.70 - 0.82 T (7,000 - 8,200 G) * **Coercive Force (Hc):** 0.8 - 1.6 A/m (0.01 - 0.02 Oe) * **Residual Induction (Br):** 0.20 - 0.40 T * **Hysteresis Loss:** Extremely low --- #### **4. Mechanical Properties** Typical properties in annealed condition. * **Tensile Strength:** 480 - 550 MPa (70 - 80 ksi) * **Yield Strength (0.2% Offset):** 250 - 320 MPa (36 - 46 ksi) * **Elongation:** 35 - 45% in 2 inches * **Hardness:** 65 - 80 HRB * **Modulus of Elasticity:** 150 GPa (21.8 × 10⁶ psi) --- #### **5. Product Forms & Specific Applications** **Available Forms:** * Sheet & Strip (0.05 mm to 3.0 mm thickness) * Foil (0.025 mm to 0.1 mm) * Bar & Rod (3.0 mm to 150 mm diameter) * Wire (0.1 mm to 6.0 mm diameter) * Fabricated Shields & Enclosures **Primary Applications:** **Electronics & Instrumentation:** * **Magnetic Shields:** CRT displays, electron microscopes, photomultiplier tubes * **Sensor Protection:** Hall effect sensors, fluxgate magnetometers * **Transformer Cores:** Specialized instrument transformers * **Recording Heads:** Magnetic tape and disk recording heads **Aerospace & Defense:** * **Avionics Shielding:** Aircraft instrumentation and navigation systems * **Satellite Components:** Spacecraft instrumentation protection * **Military Electronics:** Radar systems and communication equipment **Medical & Scientific:** * **MRI Shielding:** Peripheral magnetic field containment * **Laboratory Equipment:** Electron microscopes, spectrometers * **Research Instruments:** Physics research apparatus **Telecommunications:** * **Cable Shielding:** Specialized communication cables * **Component Protection:** Sensitive communication equipment --- #### **6. International Standards** Comprehensive international specifications. | Standard Type | Standard Number | Title / Specification | |:---|:---|:---| | **ASTM** | **ASTM A753** | Standard Specification for Nickel-Iron Soft Magnetic Alloys | | **MIL-SPEC** | **MIL-N-14411C** | Composition 1, Grade 1 | | **IEC** | **IEC 60404-8-6** | Metallic Magnetic Materials | | **AMS** | **AMS 7702** | Aerospace Material Specification | | **DIN** | **DIN 17745** | Nickel-Iron Alloys with Special Magnetic Properties | | **JIS** | **JIS C 2531** | Soft Magnetic Alloys | --- #### **7. Heat Treatment & Processing** **Critical Heat Treatment:** * **Annealing Temperature:** 1100 - 1150°C in pure dry hydrogen * **Cooling Rate:** Controlled cooling >100°C/hour through 600 - 400°C range * **Atmosphere Control:** Essential for optimal magnetic properties * **Stress Relief:** 400 - 500°C for stress relief after forming **Fabrication Guidelines:** * **Forming:** Excellent in annealed condition; avoid cold working after final anneal * **Machining:** Difficult due to work hardening; requires special techniques * **Joining:** Soldering preferred; welding degrades magnetic properties * **Handling:** Avoid mechanical stress after final heat treatment --- #### **8. Special Characteristics** **Unique Features:** * **Extreme Sensitivity:** Requires careful handling to maintain properties * **Work Hardening:** Rapidly work hardens during deformation * **Stress Sensitivity:** Magnetic properties degrade with mechanical stress * **Aging Stability:** Excellent long-term stability when properly processed **Performance Advantages:** * **Superior Shielding:** Unmatched low-frequency magnetic shielding * **Low Core Loss:** Excellent for sensitive instrument applications * **High Saturation:** Good magnetic flux carrying capacity * **Stable Performance:** Consistent magnetic characteristics --- **Summary** **Mu-Metal (Hy-Mu 80)** represents the pinnacle of soft magnetic materials, offering unparalleled magnetic permeability and shielding effectiveness for demanding applications. Its carefully balanced nickel-iron-molybdenum composition, combined with specialized heat treatment processes, enables exceptional performance in magnetic shielding, sensitive instrumentation, and precision electromagnetic applications. The material's extreme sensitivity to mechanical stress necessitates careful handling and processing to maintain its superior magnetic properties. Compliance with **ASTM A753** and other international standards ensures consistent quality and performance across all product forms. Mu-Metal remains the material of choice for the most challenging magnetic shielding applications where maximum permeability and minimum coercivity are essential requirements in electronics, aerospace, medical, and research sectors.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 2534 gallon liquid totes Special package is available on request.