Alloy 27，Glass sealing 27 Alloy Rod，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 27 / Glass Sealing 27 Alloy Rod** **Precision Rod Stock for Critical Glass-to-Metal Sealing Applications** **Alloy 27 Rod**, specifically designed for glass-to-metal sealing applications, is a premium cobalt-nickel-iron alloy that provides exceptional thermal compatibility with various sealing glasses. This controlled expansion alloy rod offers manufacturers the ideal raw material for producing reliable hermetic seals in electronic components, semiconductor packages, and precision instruments. With its consistent thermal expansion characteristics and excellent machinability, Alloy 27 rod ensures superior performance in the most demanding sealing applications. --- #### **1. Chemical Composition (Weight %)** | Element | Content (%) | | :--- | :--- | | **Cobalt (Co)** | 26.5 - 27.5 | | **Nickel (Ni)** | 26.5 - 27.5 | | **Iron (Fe)** | Balance | | **Manganese (Mn)** | 0.50 max | | **Silicon (Si)** | 0.50 max | | **Carbon (C)** | 0.15 max | | **Chromium (Cr)** | 0.20 max | | **Aluminum (Al)** | 0.10 max | | **Copper (Cu)** | 0.20 max | | **Zirconium (Zr)** | 0.10 max | | **Sulfur (S)** | 0.015 max | | **Phosphorus (P)** | 0.015 max | * **Precision Balanced Chemistry:** The critical 27% **Cobalt** and 27% **Nickel** content ensures perfect thermal expansion matching with borosilicate and other sealing glasses, while maintaining excellent sealing characteristics. --- #### **2. Physical Properties** | Property | Value | | :--- | :--- | | **Density** | 0.290 lb/in³ (8.03 g/cm³) | | **Melting Point** | 1425-1450°C (2600-2640°F) | | **Specific Heat** | 0.105 Btu/lb-°F (440 J/kg-°K) | | **Thermal Conductivity** | 10.5 Btu-ft/hr-ft²-°F (18.1 W/m·K) | | **Mean Coefficient of Thermal Expansion** | 5.3-6.2 x 10⁻⁶/°C (20-400°C) | | **Modulus of Elasticity** | 20 x 10⁶ psi (138 GPa) | | **Electrical Resistivity** | 35.0 μΩ·cm at 20°C | | **Curie Temperature** | 430°C (806°F) | | **Thermal Expansion Match** | Excellent with borosilicate glasses (Corning 7052, 7040) | --- #### **3. Mechanical Properties** | Property | Annealed Condition | Cold Drawn Condition | | :--- | :--- | :--- | | **Tensile Strength** | 75-95 ksi (517-655 MPa) | 90-110 ksi (621-758 MPa) | | **Yield Strength (0.2% Offset)** | 45-65 ksi (310-448 MPa) | 70-90 ksi (483-621 MPa) | | **Elongation** | 30-40% | 15-25% | | **Hardness** | Rb 75-85 | Rb 85-95 | | **Machinability** | 40% (compared to free-cutting brass) | 35% | --- #### **4. Product Applications** **Primary Applications for Rod Form:** * **Electronic Component Manufacturing:** - Semiconductor package leads and pins - IC header pins and terminals - Diode and transistor leads - Microwave package components * **Hermetic Connector Production:** - Feedthrough pins and connectors - High-reliability electrical contacts - Sensor connection terminals - Military and aerospace connectors * **Specialty Component Fabrication:** - Glass-sealed thermocouple junctions - Optical device mounting pins - Vacuum tube components - Medical device implant connections * **Research and Development:** - Prototype sealing components - Custom electronic packaging - Laboratory instrument fabrication **Rod-Specific Advantages:** - Excellent surface quality for consistent sealing - Uniform grain structure for reliable performance - Good machinability for precision component manufacturing - Consistent dimensional stability --- #### **5. International Standards & Specifications** **Material Standards:** - **ASTM F15:** Specification for Iron-Nickel-Cobalt Sealing Alloys - **UNS K94610:** Unified Numbering System designation - **MIL-DTL-23488:** Military specification for sealing alloys - **AMS 7723:** Aerospace Material Specification - **ISO 13123:** Thermal expansion testing standard - **GB/T 15013:** Chinese National Standard **Rod Specifications:** - **Diameter Range:** 0.020" to 2.000" (0.5mm to 50.8mm) - **Diameter Tolerance:** ±0.001" to ±0.005" depending on size - **Length:** Standard 12-foot rods, custom lengths available - **Straightness:** 0.010" per foot maximum - **Surface Finish:** 32 microinch RMS or better - **Condition:** Annealed, centerless ground, or cold drawn --- #### **6. Manufacturing & Processing Guidelines** **Machining Recommendations:** - **Cutting Tools:** Carbide or high-speed steel - **Cutting Speed:** 60-100 SFM for turning operations - **Feed Rate:** 0.003-0.010 inches per revolution - **Coolant:** Recommended for optimum surface finish **Heat Treatment:** - **Annealing Temperature:** 850-950°C (1560-1740°F) - **Atmosphere:** Hydrogen or vacuum recommended - **Cooling Rate:** Controlled to prevent oxidation **Surface Preparation for Sealing:** - **Cleaning:** Essential for successful glass bonding - **Oxidation Control:** Critical during heat treatment - **Surface Finish:** Specific roughness requirements for optimal glass adhesion --- #### **Why Choose Our Alloy 27 Rod?** * **Premium Quality:** Strict control of chemical composition and microstructure * **Consistent Performance:** Reliable thermal expansion characteristics * **Precision Manufacturing:** Tight diameter tolerances and superior surface finish * **Technical Support:** Expert guidance on machining and sealing processes * **Quality Certification:** Full traceability with certified test reports * **Global Compliance:** Meets international standards and customer specifications **Available Services:** - Custom cutting to specified lengths - Centerless grinding for precise diameters - Special surface preparations - Heat treatment services - Comprehensive material testing **Contact our technical team** for specific requirements and application support. We provide comprehensive solutions for your glass-to-metal sealing needs, from raw material supply to processing recommendations.

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 2743 gallon liquid totes Special package is available on request.