Alloy 27，Glass sealing 27 Alloy Plate，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 27 / Glass Sealing 27 Alloy Plate** **Premium Plate Stock for High-Reliability Glass-to-Metal Sealing Applications** **Alloy 27 Plate** is a specialized cobalt-nickel-iron alloy in plate form, specifically engineered for critical glass-to-metal sealing applications requiring flat, stable sealing surfaces. This controlled expansion alloy plate offers exceptional thermal compatibility with various sealing glasses, making it ideal for manufacturing base plates, headers, flanges, and other flat sealing components in electronic, aerospace, and medical industries where precise dimensional stability and reliable hermetic seals are essential. --- #### **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 | | **Cuprum (Cu)** | 0.20 max | | **Zirconium (Zr)** | 0.10 max | | **Sulfur (S)** | 0.015 max | | **Phosphorus (P)** | 0.015 max | * **Precision Alloy Design:** The exact 27% **Cobalt** and 27% **Nickel** composition ensures perfect thermal expansion matching with borosilicate glasses, while the iron matrix provides the structural integrity required for plate applications. --- #### **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 Fatigue Resistance** | Excellent | --- #### **3. Mechanical Properties** | Property | Annealed Condition | Cold Rolled Condition | | :--- | :--- | :--- | | **Tensile Strength** | 75-95 ksi (517-655 MPa) | 90-115 ksi (621-793 MPa) | | **Yield Strength (0.2% Offset)** | 45-65 ksi (310-448 MPa) | 75-95 ksi (517-655 MPa) | | **Elongation** | 30-40% | 15-25% | | **Hardness** | Rb 75-85 | Rb 90-100 | | **Flatness Tolerance** | 0.010" per inch | 0.005" per inch | --- #### **4. Product Specifications & Applications** **Plate Specifications:** - **Thickness Range:** 0.010" to 2.000" (0.25mm to 50.8mm) - **Width Range:** 6" to 48" (152mm to 1219mm) - **Length Range:** 12" to 144" (305mm to 3658mm) - **Surface Finish:** 2B, No. 1, or customized finishes - **Flatness:** Commercial or precision grades available **Primary Applications:** * **Electronic Packaging:** - IC package base plates - Power device headers - Hybrid circuit substrates - Microwave package platforms * **Semiconductor Manufacturing:** - Process equipment sealing plates - Vacuum chamber flanges - Equipment mounting bases - Sensor mounting platforms * **Medical Devices:** - Implantable device enclosures - Medical instrument bases - Diagnostic equipment frames - Surgical tool components * **Aerospace & Defense:** - Avionics package bases - Sensor mounting plates - Optical platform components - Military electronics housings **Specialized Plate Applications:** - Glass viewing window frames - Hermetic connector mounting plates - Vacuum system flanges - Precision instrument bases - Custom sealing components --- #### **5. International Standards & Specifications** **Material Standards:** - **ASTM F15:** Standard Specification for Iron-Nickel-Cobalt Sealing Alloys - **UNS K94610:** Unified Numbering System - **MIL-DTL-23488:** Military Specification - **AMS 7723:** Aerospace Material Specification - **ISO 13123:** Thermal Expansion Testing - **DIN 1705:** German Industrial Standard - **JIS C2531:** Japanese Industrial Standard **Plate Specifications:** - **Thickness Tolerance:** ±0.001" to ±0.015" (depending on thickness) - **Flatness Standards:** ASTM A480 compliant - **Surface Quality:** No. 1 finish standard, special finishes available - **Dimensional Stability:** Controlled through stress relieving - **Certification:** EN 10204 3.1/3.2 available --- #### **6. Processing & Fabrication Guidelines** **Machining Characteristics:** - Good machinability in annealed condition - Suitable for precision milling and turning - Excellent surface finish achievable - Minimal tool wear with proper techniques **Fabrication Processes:** - **Blanking and Punching:** Clean edge characteristics - **Milling and Drilling:** Precise feature creation - **Surface Grinding:** For ultra-flat applications - **Heat Treatment:** Essential for stress relief **Heat Treatment:** - **Solution Annealing:** 850-950°C (1560-1740°F) - **Stress Relieving:** 425-540°C (800-1000°F) - **Atmosphere Control:** Hydrogen or vacuum required - **Cooling Rate:** Critical for dimensional stability **Glass Sealing Performance:** - Perfect thermal expansion match with borosilicate glasses - Compatible with Corning 7052, 7040 series glasses - Excellent for large-area sealing applications - Stable performance under thermal cycling conditions --- #### **Why Choose Our Alloy 27 Plate?** * **Premium Quality Material:** Strict chemical composition control and microstructure optimization * **Precision Manufacturing:** Excellent flatness and dimensional accuracy * **Consistent Performance:** Reliable thermal expansion characteristics batch-to-batch * **Technical Expertise:** Comprehensive support for fabrication and sealing processes * **Quality Assurance:** Full traceability with certified test reports * **Global Compliance:** Meets international standards and customer specifications **Value-Added Services:** - Precision cutting to size - Surface grinding and finishing - Stress relief annealing - Custom machining services - Comprehensive testing and certification **Contact our technical team** for specific application requirements and engineering support. We provide complete solutions for your glass-to-metal sealing plate applications, from material selection to fabrication guidance and quality assurance. Our expertise ensures your sealing applications achieve the highest levels of reliability and performance.

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 2747 gallon liquid totes Special package is available on request.