Permalloy, Sheet,,E FORU

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

### **Permalloy - Sheet Product Overview** **Permalloy** is a nickel-iron soft magnetic alloy renowned for its extremely high magnetic permeability and low coercivity. The **Sheet** form provides thin, flat material for applications requiring flexible magnetic shielding, transformer laminations, and excellent soft magnetic characteristics in electronic equipment. * **Common Names:** Permalloy Sheet, High Permeability Nickel-Iron Alloy Sheet * **Key Variants:** Permalloy 45 Sheet, Permalloy 80 Sheet --- #### **1. Chemical Composition** | Element | Permalloy 45 (%) | Permalloy 80 (%) | |---------|------------------|------------------| | **Nickel (Ni)** | 45-50 | 77-83 | | **Iron (Fe)** | Balance | Balance | | **Molybdenum (Mo)** | - | 0.5-2.0 | | **Copper (Cu)** | - | 3-5 | | **Manganese (Mn)** | 0.30-0.60 | 0.30-0.60 | | **Silicon (Si)** | 0.10-0.30 | 0.10-0.30 | | **Carbon (C)** | 0.02 max | 0.02 max | --- #### **2. Physical Properties** | Property | Permalloy 45 | Permalloy 80 | |----------|--------------|--------------| | **Density (g/cm³)** | 8.17 | 8.74 | | **Melting Point (°C)** | 1420 | 1450 | | **Curie Temperature (°C)** | 440 | 460 | | **Electrical Resistivity (μΩ·m)** | 0.45 | 0.55 | | **Thermal Conductivity (W/m·K)** | 18 | 16 | | **Thermal Expansion (μm/m·°C)** | 12.0 | 12.5 | --- #### **3. Magnetic Properties** | Property | Permalloy 45 | Permalloy 80 | |----------|--------------|--------------| | **Initial Permeability (μi)** | 2,500-4,000 | 20,000-50,000 | | **Maximum Permeability (μmax)** | 25,000-50,000 | 70,000-150,000 | | **Saturation Induction (T)** | 1.5-1.6 | 0.70-0.82 | | **Coercive Force (A/m)** | 8-16 | 1.2-2.4 | | **Residual Induction (T)** | 0.4-0.6 | 0.15-0.30 | --- #### **4. Mechanical Properties** | Thickness (mm) | Temper | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | |----------------|--------|------------------------|----------------------|----------------| | 0.1-0.5 | Annealed | 460-530 | 230-300 | 35-45 | | 0.5-1.0 | Annealed | 470-540 | 240-310 | 35-45 | | 1.0-3.0 | Annealed | 470-540 | 240-310 | 35-45 | | 3.0-6.0 | Annealed | 480-550 | 250-320 | 30-40 | --- #### **5. Product Specifications & Applications** **Sheet Specifications:** * **Thickness Range:** 0.1 mm to 6.0 mm * **Width Range:** 100 mm to 600 mm * **Length:** Standard coils or cut lengths * **Thickness Tolerance:** ±5% standard, ±3% available * **Surface Finish:** 0.8 μm Ra standard, 0.4 μm Ra available **Temper Conditions:** * **Annealed:** Optimal magnetic properties, good formability * **Quarter Hard:** Moderate formability with increased strength * **Half Hard:** Limited formability, higher strength * **Full Hard:** Maximum strength, minimal formability **Primary Applications:** **Electronics & Instrumentation:** * **Transformer Laminations:** Precision cores for audio and instrument transformers * **Magnetic Shields:** Enclosures and cabinets for electronic equipment * **CRT Display Shields:** Magnetic shielding for cathode ray tubes * **Sensor Enclosures:** Magnetic shielding for sensitive sensors **Scientific & Research:** * **Laboratory Equipment Shields:** Magnetic shielding for instruments * **Research Apparatus:** Components for physics experiments * **Magnetic Measurement Equipment:** Shielding for sensitive detectors * **Vacuum System Components:** Magnetic shielding elements **Medical & Healthcare:** * **MRI Peripheral Shielding:** Supplementary magnetic shielding * **Medical Device Enclosures:** Shielding for sensitive medical equipment * **Research Instrumentation:** Components for medical research **Industrial Applications:** * **Current Transformer Cores:** Precision magnetic cores * **Test Chamber Liners:** Magnetic shielding liners * **Quality Control Equipment:** Magnetic shielding components --- #### **6. International Standards** | Standard Type | Standard Number | Title / Specification | |---------------|----------------|----------------------| | **ASTM** | **ASTM A753** | Standard Specification for Nickel-Iron Soft Magnetic Alloys | | **ASTM** | **ASTM B48** | Standard Specification for Nickel Alloy Sheet | | **IEC** | **IEC 60404-8-6** | Metallic Magnetic Materials | | **MIL-SPEC** | **MIL-N-14411** | Nickel-Iron Magnetic Alloys | | **AMS** | **AMS 7701/7702** | Aerospace Material Specifications | | **DIN** | **DIN 17745** | Nickel-Iron Alloys with Special Magnetic Properties | --- #### **7. Manufacturing & Processing** **Forming Characteristics:** * **Deep Drawing:** Good in annealed condition with proper tooling * **Stamping:** Suitable for production of laminations and shields * **Bending:** Minimum bend radius 2x thickness (annealed) * **Blank Size:** Practical limits based on thickness and equipment **Critical Heat Treatment:** * **Final Annealing:** 1100-1150°C in pure dry hydrogen atmosphere * **Stress Relief:** 400-500°C after forming operations * **Cooling Rate:** Controlled cooling >100°C/hour through Curie point * **Atmosphere Control:** Essential for optimal magnetic properties **Fabrication Guidelines:** * **Joining:** Mechanical fastening preferred; soldering acceptable * **Handling:** Avoid mechanical stress after final anneal * **Storage:** Flat storage with proper support * **Cleaning:** Avoid abrasive methods that induce stress --- #### **8. Quality Assurance** * **Dimensional Control:** Thickness, width, and flatness verification * **Magnetic Testing:** Permeability and coercive force measurement * **Surface Inspection:** Visual and automated surface quality assessment * **Mechanical Testing:** Tensile and hardness testing per lot * **Flatness Standards:** ≤3 mm per meter for most applications * **Certification:** Full material traceability with test reports --- **Summary** **Permalloy Sheet** provides a versatile thin-gauge material solution for applications requiring flexible magnetic shielding, precision transformer cores, and superior soft magnetic characteristics. The availability of both Permalloy 45 (with higher saturation induction) and Permalloy 80 (with higher permeability) allows engineers to select the optimal material based on specific application requirements for magnetic performance and formability. These sheets enable cost-effective manufacturing of complex magnetic components through stamping, forming, and fabrication processes while maintaining the exceptional soft magnetic properties that define the Permalloy family. Compliance with **ASTM A753** and other international standards ensures material consistency and performance reliability for applications in electronics, telecommunications, scientific research, and medical equipment where maximum permeability and minimum coercivity are essential. Proper heat treatment in hydrogen atmosphere and careful handling throughout the manufacturing process are crucial to preserve the exceptional magnetic properties in sheet 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 2553 gallon liquid totes Special package is available on request.