Alloy 77，Nilomag 77 Bar(Round bar, Flat bar)，,E FORU

British Specs:，American Specs: AMS 6519 Bar, Tube, Forging，German Specs:

### **Product Introduction: Alloy 77 / Nilomag 77 Bar (Round Bar & Flat Bar)** **Premium Bar Stock for Specialized Magnetic and Thermal Applications** **Alloy 77 Bar**, commercially known as **Nilomag 77 Bar**, is a specialized nickel-iron alloy available in both round and flat bar configurations, engineered to provide exceptional dimensional stability combined with controlled magnetic properties. This advanced material offers reliable performance in applications requiring specific thermal expansion characteristics along with low magnetic permeability, making it ideal for precision instruments, electronic components, and specialized industrial applications where both thermal and magnetic properties are critical. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | Control Significance | | :--- | :--- | :--- | | **Nickel (Ni)** | 76.0 - 78.0 | Primary property control | | **Iron (Fe)** | Balance | Matrix formation | | **Manganese (Mn)** | 0.50 max | Deoxidation control | | **Silicon (Si)** | 0.30 max | Deoxidation agent | | **Carbon (C)** | 0.05 max | Magnetic properties | | **Chromium (Cr)** | 0.20 max | Surface stability | | **Cobalt (Co)** | 0.50 max | Magnetic characteristics | | **Copper (Cu)** | 0.20 max | Minor alloying element | * **Precision Engineering:** The high nickel content (76-78%) ensures specific magnetic characteristics while maintaining excellent thermal expansion properties for precision bar applications. --- #### **2. Physical Properties** | Property | Value | | :--- | :--- | | **Density** | 8.75 g/cm³ | | **Melting Point** | 1425°C | | **Thermal Conductivity** | 16.5 W/m·K | | **Mean CTE (20-300°C)** | 10.5-11.5 × 10⁻⁶/°C | | **Specific Heat Capacity** | 440 J/kg·K | | **Electrical Resistivity** | 55 μΩ·cm | | **Curie Temperature** | 450°C | | **Magnetic Permeability** | < 1.05 | --- #### **3. Mechanical Properties** | Property | Round Bar (Annealed) | Flat Bar (Annealed) | | :--- | :--- | :--- | | **Tensile Strength** | 65-80 ksi (448-552 MPa) | 68-83 ksi (469-572 MPa) | | **Yield Strength (0.2%)** | 35-50 ksi (241-345 MPa) | 38-53 ksi (262-365 MPa) | | **Elongation** | 35-45% | 32-42% | | **Hardness** | HRB 70-80 | HRB 72-82 | | **Modulus of Elasticity** | 24 × 10⁶ psi (165 GPa) | 24 × 10⁶ psi (165 GPa) | --- #### **4. Product Specifications & Applications** **Round Bar Applications:** - Microwave tube components and structural elements - Waveguide support rods and mounting shafts - Precision instrument shafts and spindles - Electronic package structural members **Flat Bar Applications:** - Magnetic shielding components - Instrument frame structures - Electronic mounting platforms - Precision fixture bases **Industry Applications:** * **Electronics & Telecommunications:** - RF component structures - Microwave assembly frames - Electronic shielding elements - Communication device components * **Precision Instrumentation:** - Measuring equipment structures - Optical system mounting bases - Laboratory apparatus frames - Sensor mounting components * **Aerospace & Defense:** - Avionics mounting structures - Radar system components - Satellite instrument platforms - Guidance system elements * **Industrial Applications:** - Specialized machinery components - Sealing application structures - Electrical device frames - Precision manufacturing fixtures --- #### **5. International Standards & Specifications** **Global Standards Compliance:** - **ASTM F30:** Standard Specification for Iron-Nickel Alloys - **UNS K94760:** Unified Numbering System Designation - **AMS 7724:** Aerospace Material Specification - **MIL-DTL-23488:** Military Specification - **ISO 4950:** High Yield Strength Steel - **DIN 17745:** German Industrial Standard - **JIS C2533:** Japanese Industrial Standard **Product Specifications:** **Round Bar:** - **Diameter Range:** 0.125" to 8.000" (3.175 mm to 203.2 mm) - **Diameter Tolerance:** ±0.001" to ±0.010" - **Straightness:** 0.010" per foot maximum - **Surface Finish:** 32 μin RMS or better **Flat Bar:** - **Thickness Range:** 0.125" to 3.000" (3.175 mm to 76.2 mm) - **Width Range:** 0.500" to 12.000" (12.7 mm to 304.8 mm) - **Flatness:** 0.005" per inch maximum - **Surface Condition:** Cold drawn or hot rolled --- #### **6. Technical Advantages & Processing Characteristics** **Manufacturing Benefits:** - **Controlled Magnetic Properties:** Specifically designed magnetic characteristics - **Excellent Thermal Stability:** Maintains dimensional accuracy - **Good Machinability:** Suitable for precision manufacturing - **Superior Weldability:** Compatible with standard welding techniques - **Corrosion Resistance:** Good performance in most environments **Processing Guidelines:** - **Machining:** Use sharp tools with positive rake angles - **Heat Treatment:** Annealing at 850-950°C recommended - **Forming:** Good cold working characteristics in annealed condition - **Surface Treatment:** Compatible with various plating processes **Magnetic Characteristics:** - **Low Magnetic Permeability:** < 1.05 in annealed condition - **Controlled Saturation Induction:** Specific magnetic saturation properties - **Stable Magnetic Properties:** Consistent performance across temperature ranges **Quality Assurance:** - **Chemical Analysis:** Complete material certification - **Mechanical Testing:** Verification of all specified properties - **Magnetic Testing:** Validation of magnetic characteristics - **Dimensional Inspection:** Precision measurement capabilities - **Traceability:** Full material history documentation --- #### **Why Choose Our Alloy 77 Bar Products?** * **Premium Quality:** Strict control of chemical composition and microstructure * **Precision Manufacturing:** Excellent dimensional accuracy and surface quality * **Technical Expertise:** Comprehensive application support and guidance * **Quality Assurance:** Full certification and traceability * **Global Compliance:** Meets international standards and specifications * **Proven Reliability:** Extensive track record in critical applications **Value-Added Services:** - Precision cutting to specified lengths - Custom machining capabilities - Heat treatment processing - Surface finishing services - Comprehensive certification packages **Contact our technical team** for detailed specifications, application engineering support, and material selection guidance. We provide complete solutions for your specialized alloy bar requirements, ensuring optimal performance in your most demanding magnetic and thermal management applications.

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 2783 gallon liquid totes Special package is available on request.