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

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

### **Mu-Metal / Hy-Mu 80 - Wire 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. The **Wire** form provides a versatile, continuous length product used for specialized magnetic applications requiring flexible magnetic paths and precise electromagnetic characteristics. * **Common Names:** Mu-Metal Wire, Hy-Mu 80 Wire, High Permeability Alloy 80 Wire --- #### **1. Chemical Composition** Precisely controlled chemistry ensures optimal magnetic properties in wire form. | 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 drawability | | **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 wire applications. | Property | Value / Condition | Notes | |:---|:---|:---| | **Density** | 8.75 g/cm³ (0.316 lb/in³) | | | **Melting Point** | ~1450 °C (2640 °F) | | | **Diameter Range** | 0.1 mm to 6.0 mm | Standard round wire | | **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 | | | **Surface Finish** | 0.2-0.8 μm Ra | Optimized for magnetic applications | --- #### **3. Magnetic Properties** **Exceptional Magnetic Characteristics:** * **Initial Permeability (μi):** 20,000 - 40,000 (at 0.002T) * **Maximum Permeability (μmax):** 70,000 - 200,000 * **Saturation Induction (Bs):** 0.65 - 0.78 T (6,500 - 7,800 G) * **Coercive Force (Hc):** 1.2 - 2.5 A/m (0.015 - 0.031 Oe) * **Residual Induction (Br):** 0.18 - 0.38 T * **Hysteresis Loss:** Extremely low --- #### **4. Mechanical Properties** Properties vary with diameter and temper condition. | Diameter (mm) | Temper | Tensile Strength (MPa) | Elongation (%) | Notes | |:---|:---|:---|:---|:---| | 0.1-0.5 | Annealed | 440-510 | 25-35 | Fine wire | | 0.5-1.0 | Annealed | 450-520 | 30-40 | Standard wire | | 1.0-3.0 | Annealed | 460-530 | 30-40 | General purpose | | 3.0-6.0 | Annealed | 460-530 | 35-45 | Heavy duty | | All | Hard Drawn | 650-800 | 5-15 | For spring applications | --- #### **5. Product Forms & Specific Applications** **Wire Configurations:** * **Round Wire:** Standard diameters from 0.1 mm to 6.0 mm * **Square Wire:** Rectangular cross-sections for specialized applications * **Bare Wire:** Standard uncoated wire * **Enameled Wire:** Insulated with thermal class coatings * **Spool Packaging:** Various spool sizes from 100g to 25kg **Primary Applications:** **Electronics & Instrumentation:** * **Magnetic Sensor Windings:** Precision coils for magnetic sensors * **Instrument Transformers:** Specialized transformer windings * **Galvanometer Coils:** Moving coils for precision instruments * **Magnetic Shielding:** Woven or wrapped magnetic shields **Scientific & Research:** * **Research Magnet Coils:** Precision windings for research magnets * **Laboratory Instrumentation:** Components for scientific instruments * **Physics Experiments:** Specialized magnetic components * **Cryogenic Applications:** Magnetic components for low-temperature use **Medical & Healthcare:** * **Medical Sensor Coils:** Windings for medical detection systems * **Imaging Equipment:** Magnetic components for medical imaging * **Research Instrumentation:** Components for medical research **Industrial Applications:** * **Control Instrument Coils:** Magnetic windings for industrial controls * **Testing Equipment:** Components for measurement instruments * **Specialty Motor Windings:** High-efficiency magnetic circuits --- #### **6. International Standards** Comprehensive international specifications for wire products. | 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 | | **ASTM** | ASTM B258 | Standard Specification for Standard Nominal Diameters of Wire | | **IEC** | IEC 60404-8-6 | Metallic Magnetic Materials | | **AMS** | AMS 7702 | Aerospace Material Specification | | **DIN** | DIN 17745 | Nickel-Iron Alloys with Special Magnetic Properties | --- #### **7. Manufacturing & Processing** **Wire Drawing Process:** * **Multiple-pass Drawing:** With intermediate hydrogen annealing * **Reduction Control:** Controlled reduction ratios for optimal properties * **Final Annealing:** Hydrogen atmosphere annealing for magnetic optimization * **Precision Spooling:** Controlled tension for consistent quality **Critical Heat Treatment:** * **Final Annealing:** 1100-1150°C in pure dry hydrogen atmosphere * **Stress Relief:** 400-500°C after coiling or forming * **Cooling Rate:** Controlled cooling >100°C/hour through critical range * **Atmosphere Control:** Essential for optimal magnetic properties **Processing Guidelines:** * **Winding:** Good winding characteristics in annealed condition * **Forming:** Excellent formability when properly annealed * **Handling:** Avoid mechanical stress after final anneal * **Storage:** Proper spool support to prevent deformation --- #### **8. Quality Assurance** * **Dimensional Control:** ±2% diameter tolerance standard, ±1% available * **Magnetic Testing:** Permeability and coercive force verification * **Surface Quality:** Visual or automated surface inspection * **Mechanical Testing:** Tensile and elongation verification * **Electrical Testing:** Resistivity and insulation integrity (if coated) * **Certification:** Full material traceability with test reports --- **Summary** **Mu-Metal (Hy-Mu 80) Wire** provides a specialized magnetic solution for applications requiring flexible magnetic paths and precision electromagnetic characteristics. Its excellent magnetic permeability, combined with good formability and consistent quality, makes it suitable for sensitive instrument coils, magnetic sensors, research apparatus, and specialized industrial applications. The wire form enables the creation of complex magnetic circuits and precision windings while maintaining the superior soft magnetic properties that define Mu-Metal. Compliance with **ASTM A753** and other international standards ensures consistent quality and performance for applications requiring high permeability and low coercivity in wire form. Proper heat treatment, careful handling, and appropriate processing techniques are crucial to preserve the exceptional magnetic properties throughout the manufacturing process and service life.

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 2546 gallon liquid totes Special package is available on request.