Alloy 27，Glass sealing 27 Alloy Tube，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 27 / Glass Sealing 27 Alloy Tube** **Precision Tubing for Advanced Glass-to-Metal Sealing Applications** **Alloy 27 Tube** is a specialized cobalt-nickel-iron alloy tubing specifically engineered for demanding glass-to-metal sealing applications requiring precise dimensions and superior surface quality. This controlled expansion alloy tubing offers exceptional thermal compatibility with various sealing glasses, making it ideal for critical applications in electronic packaging, semiconductor equipment, medical devices, and precision instrumentation where reliability and hermetic integrity are paramount. --- #### **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 Alloy Formulation:** The carefully controlled 27% **Cobalt** and 27% **Nickel** composition ensures optimal thermal expansion matching with borosilicate glasses, while the balanced iron content provides structural integrity for tubular sealing 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 Shock Resistance** | Excellent | --- #### **3. Mechanical Properties** | Property | Seamless Annealed Tube | Welded & Annealed Tube | | :--- | :--- | :--- | | **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 | | **Collapse Pressure** | OD and wall thickness dependent | OD and wall thickness dependent | --- #### **4. Product Specifications & Applications** **Tube Configurations Available:** - **Seamless Tube:** Superior integrity for high-reliability applications - **Welded & Redrawn Tube:** Excellent dimensional control and surface finish - **Diameter Range:** 0.010" to 2.000" OD (0.25mm to 50.8mm) - **Wall Thickness:** 0.002" to 0.125" (0.05mm to 3.18mm) - **Lengths:** Standard 12-foot lengths, custom lengths available **Primary Applications:** * **Electronics & Semiconductor:** - IC package enclosures - Diode and transistor housings - Microwave tube components - Vacuum interrupter envelopes * **Medical Devices:** - Implantable device containers - Pacemaker enclosures - Surgical instrument components - Diagnostic equipment housings * **Aerospace & Defense:** - Hermetic sensor packages - Laser tube housings - Optical device enclosures - Navigation system components * **Industrial Equipment:** - High-reliability electrical feedthroughs - Optical viewport assemblies - Pressure sensor housings - Specialized instrument packaging **Specialized Tube Applications:** - Glass-to-metal transition sleeves - Hermetic terminal seals - Precision instrument housings - Custom manifold assemblies - Laboratory apparatus components --- #### **5. International Standards & Specifications** **Material Standards:** - **ASTM F15:** Standard Specification for Iron-Nickel-Cobalt Sealing Alloys - **ASTM B751:** Standard Specification for Nickel-Alloy Seamless Tube - **UNS K94610:** Unified Numbering System - **MIL-DTL-23488:** Military Specification - **ISO 13123:** Metallic Materials - Thermal Expansion Testing - **DIN 1705:** German Industrial Standard - **JIS C2531:** Japanese Industrial Standard **Tube Specifications:** - **Tolerance Grades:** Precision, ultra-precision available - **Surface Finish:** 16-32 μin Ra (0.4-0.8 μm) standard - **Straightness:** 0.001" per foot maximum - **Concentricity:** 90% minimum wall uniformity - **End Condition:** Square cut, deburred ends standard --- #### **6. Processing & Fabrication Guidelines** **Manufacturing Processes:** - Cold drawing with intermediate annealing - Precision grinding and polishing available - Full-length annealing for stress relief - 100% dimensional inspection **Fabrication Capabilities:** - **Machining:** Excellent in annealed condition - **Welding:** Compatible with matched composition filler - **Bending:** Suitable for precision tube bending - **Glass Sealing:** Optimized surface preparation **Heat Treatment:** - **Solution Annealing:** 850-950°C (1560-1740°F) - **Atmosphere:** Hydrogen or vacuum essential - **Cooling Control:** Critical for sealing performance **Glass Sealing Performance:** - Perfect thermal match with borosilicate glasses - Compatible with Corning 7052, 7040 series - Excellent for tubular and sleeve sealing configurations - Reliable performance in thermal cycling environments --- #### **Why Choose Our Alloy 27 Tube?** * **Premium Quality:** Rigorous control of chemical composition and microstructure * **Precision Manufacturing:** Exceptional dimensional accuracy and surface quality * **Consistent Performance:** Reliable thermal expansion characteristics * **Technical Expertise:** Comprehensive support for fabrication and sealing processes * **Quality Certification:** Full traceability with certified test reports * **Global Compliance:** Meets international standards and customer specifications **Value-Added Services:** - Precision cutting and machining - Custom end finishing - Special surface preparations - Heat treatment processing - 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 tube applications, from material selection to fabrication guidance and quality assurance.

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 2746 gallon liquid totes Special package is available on request.