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

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

### **Mu-Metal / Hy-Mu 80 - Rod 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 **Rod** form provides solid, cylindrical stock material for machining precision components requiring superior magnetic shielding properties and excellent machinability in soft magnetic applications. * **Common Names:** Mu-Metal Rod, Hy-Mu 80 Rod, High Permeability Alloy 80 Rod --- #### **1. Chemical Composition** Precisely controlled chemistry ensures optimal magnetic properties in rod 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 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 rod applications. | Property | Value / Condition | Notes | |:---|:---|:---| | **Density** | 8.75 g/cm³ (0.316 lb/in³) | | | **Melting Point** | ~1450 °C (2640 °F) | | | **Rod Diameter Range** | 3.0 mm to 150 mm | Standard sizes available | | **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) | | --- #### **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 for rod in annealed condition. | Diameter Range (mm) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) | |:---|:---|:---|:---|:---| | 3.0-12.0 | 480-550 | 250-320 | 35-45 | 65-80 | | 12.0-25.0 | 480-550 | 250-320 | 35-45 | 65-80 | | 25.0-50.0 | 470-540 | 240-310 | 35-45 | 63-78 | | 50.0-150.0 | 460-530 | 230-300 | 30-40 | 63-78 | --- #### **5. Product Specifications & Applications** **Rod Specifications:** * **Diameter Tolerances:** ±0.1 mm for diameters <25 mm, ±0.2% for diameters >25 mm * **Straightness:** ≤1 mm per meter length * **Surface Finish:** 3.2 μm Ra (125 μin) standard, 1.6 μm Ra (63 μin) available * **Length:** Standard 3-4 meters, custom lengths available * **Condition:** Annealed and stress-relieved **Primary Applications:** **Electronics & Instrumentation:** * **Magnetic Core Components:** Precision-machined cores for instruments * **Shielding Rods:** Magnetic shielding elements for sensitive equipment * **Sensor Components:** Hall effect sensor housings and flux concentrators * **Transformer Parts:** Specialized transformer core components **Aerospace & Defense:** * **Avionics Components:** Precision parts for aircraft instrumentation * **Guidance System Parts:** Components for navigation systems * **Military Electronics:** Radar system components and shielding elements **Medical & Scientific:** * **MRI Components:** Peripheral magnetic components * **Research Equipment:** Precision parts for physics research apparatus * **Laboratory Instruments:** Components for sensitive measuring devices **Industrial Applications:** * **Testing Equipment:** Precision components for magnetic test equipment * **Calibration Standards:** Reference standards for magnetic measurements * **Specialized Fixtures:** Magnetic fixtures and tooling --- #### **6. International Standards** Comprehensive standardization for rod 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 | | **AMS** | **AMS 7702** | Aerospace Material Specification | | **ASTM** | ASTM B48 | Standard Specification for Rod and Bar | | **IEC** | IEC 60404-8-6 | Metallic Magnetic Materials | | **DIN** | DIN 17745 | Nickel-Iron Alloys with Special Magnetic Properties | --- #### **7. Machining & Processing Characteristics** **Machinability:** * **Machinability Rating:** 25% (compared to free-cutting brass at 100%) * **Recommended Tools:** Sharp carbide tools with positive rake angles * **Cutting Speed:** 20-35 m/min for turning operations * **Feed Rate:** 0.08-0.25 mm/rev * **Coolant:** Essential for optimal tool life and surface finish **Critical Heat Treatment:** * **Final Annealing:** 1100-1150°C in pure dry hydrogen atmosphere * **Stress Relief:** 400-500°C after machining operations * **Cooling Rate:** Controlled cooling >100°C/hour through critical range * **Atmosphere Control:** Essential for optimal magnetic properties **Special Processing Requirements:** * **Stress Management:** Avoid mechanical stress after final anneal * **Handling:** Careful handling to prevent degradation of magnetic properties * **Storage:** Proper support to prevent bending or distortion --- #### **8. Quality Assurance** * **Chemical Analysis:** Heat certification to specified composition * **Dimensional Verification:** 100% diameter and straightness checking * **Magnetic Testing:** Permeability and coercive force verification * **Mechanical Testing:** Tensile and hardness testing per ASTM standards * **Metallurgical Quality:** Grain size control and structure examination --- **Summary** **Mu-Metal (Hy-Mu 80) Rod** provides a machinable form of this exceptional soft magnetic alloy, offering unparalleled magnetic permeability and shielding effectiveness for precision components. 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 rod form allows for manufacturing of complex components through machining operations while maintaining the superior magnetic properties that make Mu-Metal the material of choice for the most demanding magnetic applications. Compliance with **ASTM A753** and other international standards ensures consistent quality and performance across all manufacturing processes. Proper handling and stress management are essential to preserve the exceptional magnetic characteristics that define this premium soft magnetic material.

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 2535 gallon liquid totes Special package is available on request.