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

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

### **Mu-Metal / Hy-Mu 80 - Tube 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 **Tube** form provides precision tubular components for applications requiring exact dimensional control and superior magnetic shielding properties in cylindrical configurations. * **Common Names:** Mu-Metal Tube, Hy-Mu 80 Tube, High Permeability Alloy 80 Tube --- #### **1. Chemical Composition** Precisely controlled chemistry ensures optimal magnetic properties in tubular 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 tubular 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 (Annealed Condition)** **Tube Mechanical Characteristics:** * **Tensile Strength:** 470-540 MPa (68-78 ksi) * **Yield Strength (0.2% Offset):** 240-310 MPa (35-45 ksi) * **Elongation:** 30-40% in 2 inches * **Hardness:** 63-78 HRB * **Modulus of Elasticity:** 150 GPa (21.8 × 10⁶ psi) * **Collapse Pressure:** Varies with diameter-to-wall thickness ratio --- #### **5. Product Specifications & Applications** **Tube Specifications:** * **Diameter Range:** 1.0 mm to 100 mm OD * **Wall Thickness:** 0.1 mm to 5.0 mm * **Length:** Standard 1-4 meters, custom lengths available * **Tolerance:** OD ±0.1 mm (<10 mm), ±0.5% (>10 mm) * **Wall Tolerance:** ±10% standard, ±5% available * **Surface Finish:** 1.6 μm Ra standard, 0.8 μm Ra available **Types Available:** * **Seamless Tube:** For high-integrity magnetic applications * **Drawn Tube:** Precision dimensional control * **Welded & Redrawn Tube:** Economical precision tubing * **Annealed Tube:** Optimized magnetic properties **Primary Applications:** **Electronics & Instrumentation:** * **CRT Display Shields:** Magnetic shielding for cathode ray tubes * **Photomultiplier Tubes:** Magnetic shielding for PMT assemblies * **Sensor Protection Tubes:** Magnetic shielding for sensitive sensors * **Electron Microscope Components:** Magnetic field containment **Scientific & Research:** * **Physics Research:** Beam line components and experimental apparatus * **Laboratory Equipment:** Magnetic shielding for sensitive instruments * **Cryogenic Applications:** Magnetic shielding at low temperatures * **Vacuum System Components:** Magnetic shielding in vacuum environments **Medical & Healthcare:** * **MRI System Components:** Peripheral magnetic shielding elements * **Medical Sensors:** Shielding for sensitive medical detection systems * **Research Equipment:** Components for medical research instruments **Telecommunications:** * **Fiber Optic Systems:** Magnetic shielding for optical components * **Communication Equipment:** Shielding for sensitive communication devices --- #### **6. International Standards** Comprehensive international specifications for tube 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 B751 | Standard Specification for Nickel Alloy Seamless Tube | | **IEC** | IEC 60404-8-6 | Metallic Magnetic Materials | | **DIN** | DIN 17745 | Nickel-Iron Alloys with Special Magnetic Properties | --- #### **7. Manufacturing & Processing** **Fabrication Characteristics:** * **Tube Drawing:** Requires careful processing to maintain magnetic properties * **Bending:** Limited capability; requires annealing after severe deformation * **Machining:** Difficult due to work hardening; special techniques required * **Joining:** Soldering preferred; welding degrades local magnetic properties **Critical Heat Treatment:** * **Final Annealing:** 1100-1150°C in pure dry hydrogen atmosphere * **Stress Relief:** 400-500°C after fabrication * **Cooling Rate:** Controlled cooling >100°C/hour through 600-400°C range * **Atmosphere Control:** Essential for optimal magnetic properties **Quality Control:** * **Dimensional Verification:** OD, wall thickness, and concentricity measurement * **Magnetic Testing:** Permeability verification on representative samples * **Surface Quality:** Visual and microscopic examination * **Metallurgical Quality:** Grain structure assessment --- #### **8. Design Considerations** **Wall Thickness Selection:** * **Ultra-Thin Wall (0.1-0.5 mm):** For miniature electronic shielding * **Thin Wall (0.5-1.5 mm):** For standard instrument applications * **Medium Wall (1.5-3.0 mm):** For enhanced magnetic shielding * **Heavy Wall (3.0-5.0 mm):** For maximum shielding effectiveness **Magnetic Performance Optimization:** * **Shielding Effectiveness:** Proportional to wall thickness and material permeability * **Frequency Range:** Most effective for DC and low-frequency fields (<100 kHz) * **Geometric Considerations:** Cylindrical symmetry enhances shielding performance * **Joint Design:** Critical for maintaining magnetic circuit continuity --- **Summary** **Mu-Metal (Hy-Mu 80) Tube** provides precision tubular solutions for applications requiring exact dimensional control and superior magnetic shielding in cylindrical configurations. Its exceptional magnetic permeability, combined with good dimensional stability and consistent quality, makes it indispensable for sensitive electronic instrumentation, scientific research equipment, medical devices, and specialized industrial applications. The tube form enables the creation of effective magnetic shields for precise cylindrical applications, providing unparalleled protection against low-frequency magnetic interference. Compliance with **ASTM A753** and other international standards ensures material consistency and performance reliability for demanding magnetic applications. Proper heat treatment, careful handling, and appropriate fabrication techniques are essential to maintain the exceptional magnetic properties that define this premium soft magnetic material in tubular form.

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 2538 gallon liquid totes Special package is available on request.