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

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

### **Mu-Metal / Hy-Mu 80 - Forgings 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 **Forgings** form provides superior mechanical properties and structural integrity for critical components requiring high reliability in demanding magnetic applications. * **Common Names:** Mu-Metal Forgings, Hy-Mu 80 Forgings, High Permeability Alloy 80 Forgings --- #### **1. Chemical Composition** Precisely controlled chemistry ensures optimal magnetic and mechanical properties in forged components. | 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 forgeability | | **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 maintained in forged components. | 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):** 25,000 - 45,000 (at 0.002T) * **Maximum Permeability (μmax):** 90,000 - 280,000 * **Saturation Induction (Bs):** 0.70 - 0.82 T (7,000 - 8,200 G) * **Coercive Force (Hc):** 1.0 - 2.0 A/m (0.012 - 0.025 Oe) * **Residual Induction (Br):** 0.25 - 0.45 T * **Hysteresis Loss:** Extremely low --- #### **4. Mechanical Properties** Forgings provide enhanced mechanical properties compared to wrought forms. **Typical Properties in Heat Treated Condition:** * **Tensile Strength:** 500-580 MPa (73-84 ksi) * **Yield Strength (0.2% Offset):** 280-350 MPa (41-51 ksi) * **Elongation:** 30-40% in 2 inches * **Reduction of Area:** 45-60% * **Impact Strength:** 45-65 J (33-48 ft-lb) [Charpy V-notch] * **Hardness:** 70-85 HRB * **Fatigue Strength:** 240 MPa (35 ksi) at 10⁸ cycles --- #### **5. Product Specifications & Applications** **Forging Types and Capabilities:** * **Closed-Die Forgings:** - Complex, near-net shapes - High dimensional accuracy - Enhanced grain flow - Weight range: 0.5 kg to 50 kg * **Open-Die Forgings:** - Larger, simpler forms - Custom shapes and sizes - Improved mechanical properties - Weight range: 50 kg to 500 kg * **Precision Forgings:** - Tight dimensional tolerances - Superior surface finish - Minimal machining required - High-integrity components **Primary Applications:** **Aerospace & Defense:** * **Aircraft Instrument Components:** Critical sensor housings and mounts * **Satellite System Parts:** Magnetic shielding for space applications * **Radar System Components:** Waveguide supports and magnetic elements * **Military Electronics:** High-reliability magnetic components **Scientific & Research:** * **Particle Accelerator Components:** Magnetic core elements and supports * **Research Magnet Components:** High-permeability magnetic circuits * **Laboratory Equipment:** Precision magnetic components * **Physics Research Apparatus:** Specialized magnetic elements **Medical & Healthcare:** * **MRI System Components:** Structural magnetic elements * **Medical Imaging Equipment:** Precision magnetic components * **Research Instrumentation:** High-performance magnetic parts **Industrial Applications:** * **Power Transformer Cores:** Large magnetic core components * **Specialty Motor Parts:** High-efficiency magnetic circuits * **Testing Equipment:** Components for magnetic measurement systems --- #### **6. International Standards** Comprehensive international specifications for forged 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 Nickel Alloy Forgings | | **IEC** | IEC 60404-8-6 | Metallic Magnetic Materials | | **DIN** | DIN 17745 | Nickel-Iron Alloys with Special Magnetic Properties | --- #### **7. Manufacturing & Quality Assurance** **Forging Process:** * **Forging Temperature:** 1150-1250°C (2100-2280°F) * **Grain Flow Optimization:** Controlled deformation for optimal properties * **Heat Treatment:** Solution annealing and stress relief cycles * **Final Machining:** Precision machining to final dimensions **Critical Heat Treatment:** * **Solution Annealing:** 1100-1150°C in pure dry hydrogen atmosphere * **Stress Relieving:** 400-500°C after rough machining * **Cooling Rate:** Controlled cooling >100°C/hour through critical range * **Atmosphere Control:** Essential for optimal magnetic properties **Quality Control:** * **Ultrasonic Testing:** Per ASTM A388 for internal quality * **Dye Penetrant Inspection:** Per ASTM E165 for surface defects * **Magnetic Testing:** Permeability and coercive force verification * **Metallurgical Examination:** Grain size assessment per ASTM E112 --- #### **8. Design Advantages** **Technical Benefits:** * **Superior Strength:** Enhanced mechanical properties over castings * **Optimized Grain Structure:** Improved magnetic performance * **Reliability:** Proven performance in critical applications * **Material Integrity:** Freedom from voids and inclusions **Application-Specific Solutions:** * **Complex Geometries:** Ability to produce intricate magnetic shapes * **Custom Designs:** Tailored to specific application requirements * **High-Volume Production:** Scalable manufacturing processes * **Technical Support:** Engineering expertise for optimal design --- **Summary** **Mu-Metal (Hy-Mu 80) Forgings** provide the highest level of structural integrity and magnetic performance for critical applications requiring both superior mechanical properties and exceptional magnetic characteristics. The forging process enhances grain structure, improves material soundness, and ensures reliable performance in demanding service conditions. While some magnetic properties may be slightly compromised compared to fully annealed sheet material, the enhanced mechanical strength and structural capabilities make forged Mu-Metal components ideal for applications where both magnetic performance and mechanical reliability are essential. Compliance with **ASTM A753** and other international standards guarantees consistent quality and performance in aerospace, research, medical, and industrial applications where failure is not an option. Proper heat treatment and careful processing are crucial to optimize both magnetic and mechanical properties in forged components.

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 2543 gallon liquid totes Special package is available on request.