Alloy 27，Glass sealing 27 Alloy Pipe，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 27 / Glass Sealing 27 Alloy Pipe** **Precision Tubing for Advanced Glass-to-Metal Sealing Applications** **Alloy 27 Pipe** is a specialized cobalt-nickel-iron alloy tubing specifically engineered for demanding glass-to-metal sealing applications. This controlled expansion alloy pipe offers exceptional thermal compatibility with various sealing glasses, making it ideal for critical applications in electronic packaging, semiconductor equipment, and precision instrumentation. The pipe form factor provides unique advantages for tubular sealing configurations and fluid handling applications requiring hermetic integrity. --- #### **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 | * **Optimized Sealing Chemistry:** The precise 27% **Cobalt** and 27% **Nickel** balance ensures perfect thermal expansion matching with borosilicate glasses, while maintaining excellent sealing reliability in tubular configurations. --- #### **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 Shock Resistance** | Excellent | --- #### **3. Mechanical Properties** | Property | Seamless Annealed Pipe | Welded & Annealed Pipe | | :--- | :--- | :--- | | **Tensile Strength** | 75-95 ksi (517-655 MPa) | 70-90 ksi (483-621 MPa) | | **Yield Strength (0.2% Offset)** | 45-65 ksi (310-448 MPa) | 40-60 ksi (276-414 MPa) | | **Elongation** | 30-40% | 25-35% | | **Hardness** | Rb 75-85 | Rb 70-80 | | **Burst Pressure** | Schedule dependent | Schedule dependent | --- #### **4. Product Specifications & Applications** **Pipe Configurations:** - **Seamless Pipe:** Maximum integrity for high-pressure applications - **Welded Pipe:** Cost-effective for standard pressure applications - **Size Range:** 1/8" to 4" NB (6mm to 100mm) - **Wall Thickness:** Schedule 5S to Schedule 80 - **Lengths:** Standard random lengths, custom cut lengths available **Primary Applications:** * **Semiconductor Industry:** - Process gas delivery systems - Chemical distribution lines - Vacuum chamber components - Etching equipment plumbing * **Aerospace & Defense:** - Hermetic sensor housings - Instrumentation pressure lines - Optical system enclosures - Avionics cooling conduits * **Medical Technology:** - Implantable device portals - Diagnostic equipment tubing - Surgical instrument components - Pharmaceutical processing lines * **Research & Laboratory:** - High-vacuum system components - Analytical instrument housings - Cryogenic application tubing - Specialized reactor vessels **Specialized Applications:** - Glass-to-metal transition pieces - Hermetic feedthrough conduits - Precision fluid handling systems - Custom manifold assemblies --- #### **5. International Standards & Specifications** **Material Standards:** - **ASTM F15:** Iron-Nickel-Cobalt Sealing Alloys - **ASTM B467:** Welded Nickel-Alloy Pipe - **UNS K94610:** Unified Numbering System - **MIL-DTL-23488:** Military Specification - **ISO 13123:** Thermal Expansion Testing - **DIN 1705:** German Industrial Standard - **JIS C2531:** Japanese Industrial Standard **Pipe Specifications:** - **Size Standards:** ASME B36.10M, B36.19M - **Pressure Ratings:** ASME B31.3 compliant - **Tolerances:** ASTM A999/A999M - **Surface Finish:** 32 Ra μin (0.8 μm) maximum - **End Preparation:** Plain, beveled, or threaded --- #### **6. Processing & Fabrication** **Machining & Fabrication:** - Excellent machinability in annealed condition - Suitable for welding using matched composition filler - Good formability for bending and shaping - Compatibility with standard pipe fabrication techniques **Heat Treatment:** - **Solution Annealing:** 850-950°C (1560-1740°F) - **Atmosphere:** Hydrogen or vacuum required - **Cooling Rate:** Controlled to prevent oxidation **Glass Sealing Compatibility:** - Perfect thermal match with borosilicate glasses - Compatible with Corning 7052, 7040, and similar - Excellent for tubular sealing configurations - Reliable performance in thermal cycling --- #### **Why Choose Our Alloy 27 Pipe?** * **Premium Quality:** Strict chemical and dimensional control * **Seamless & Welded Options:** Comprehensive product range * **Precision Manufacturing:** Tight tolerances and superior surface finish * **Technical Expertise:** Full support for fabrication and sealing processes * **Quality Certification:** Complete traceability and test reports * **Global Compliance:** Meets international standards and specifications **Value-Added Services:** - Custom cutting and machining - End preparation and threading - Heat treatment processing - Non-destructive testing - Comprehensive certification packages **Contact our technical team** for specific application requirements and engineering support. We provide complete solutions for your glass-to-metal sealing pipe applications, from material selection to fabrication guidance.

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 2745 gallon liquid totes Special package is available on request.