Alloy 27，Glass sealing 27 Alloy Bar(Round bar, Flat bar)，,E FORU

British Specs:，American Specs:，German Specs:

### **Product Introduction: Alloy 27 / Glass Sealing 27 Alloy Bar (Round Bar & Flat Bar)** **Premium Bar Stock for Precision Glass-to-Metal Sealing Components** **Alloy 27 Bar**, available in both round and flat bar configurations, is a specialized cobalt-nickel-iron alloy specifically engineered for glass-to-metal sealing applications. This controlled expansion alloy provides exceptional thermal compatibility with various sealing glasses, making it an ideal material for manufacturing critical components in electronic, aerospace, and medical industries. The availability in both round and flat bar forms offers designers and manufacturers versatile solutions for different sealing component requirements. --- #### **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 Balance:** The critical combination of **27% Cobalt** and **27% Nickel** creates the optimal thermal expansion characteristics required for perfect matching with borosilicate and other sealing glasses, ensuring reliable hermetic seals. --- #### **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 Conductivity** | 18.1 W/m·K at 20°C | --- #### **3. Mechanical Properties** | Property | Round Bar (Annealed) | Flat Bar (Annealed) | | :--- | :--- | :--- | | **Tensile Strength** | 75-95 ksi (517-655 MPa) | 78-98 ksi (538-676 MPa) | | **Yield Strength (0.2% Offset)** | 45-65 ksi (310-448 MPa) | 48-68 ksi (331-469 MPa) | | **Elongation** | 30-40% | 28-38% | | **Hardness** | Rb 75-85 | Rb 78-88 | | **Machinability Rating** | 40% | 38% | --- #### **4. Product Specifications & Applications** **Round Bar Applications:** - Semiconductor package leads and pins - Hermetic connector feedthroughs - Electronic component terminals - Precision shafting for glass-sealed assemblies - Medical device implant components **Flat Bar Applications:** - IC header frames and substrates - Sealing flange components - Mounting brackets for glass assemblies - Structural supports in electronic packages - Custom machined sealing components **Industry Applications:** * **Electronics & Semiconductor:** - IC package components - Power device headers - Microwave package frames * **Aerospace & Defense:** - Hermetic connector bodies - Sensor mounting components - Avionics packaging * **Medical Technology:** - Implantable device enclosures - Diagnostic equipment components - Medical sensor packaging * **Industrial Equipment:** - High-reliability electrical contacts - Optical device mounts - Vacuum system 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 **Product Specifications:** **Round Bar:** - **Diameter Range:** 1/8" to 3" (3.0mm to 76.2mm) - **Diameter Tolerance:** ±0.001" to ±0.005" - **Straightness:** 0.010" per foot maximum - **Surface Finish:** 32 μin RMS or better **Flat Bar:** - **Thickness Range:** 1/16" to 2" (1.6mm to 50.8mm) - **Width Range:** 1/4" to 6" (6.4mm to 152.4mm) - **Flatness:** 0.005" per inch maximum - **Surface Condition:** Cold drawn or hot rolled --- #### **6. Processing & Manufacturing Advantages** **Machining Characteristics:** - Good machinability in annealed condition - Capable of achieving precise tolerances - Suitable for both conventional and CNC machining - Excellent surface finish capabilities **Heat Treatment:** - **Annealing Temperature:** 850-950°C (1560-1740°F) - **Atmosphere Control:** Hydrogen or vacuum recommended - **Stress Relieving:** 425-540°C (800-1000°F) **Glass Sealing Compatibility:** - Perfect match with borosilicate glasses (Corning 7052, 7040) - Compatible with various sealing glass types - Excellent wetting characteristics - Reliable hermetic seal formation --- #### **Why Choose Our Alloy 27 Bar Products?** * **Quality Assurance:** Strict control of chemical composition and microstructure * **Dimensional Precision:** Tight tolerances for both round and flat bars * **Consistent Performance:** Reliable thermal expansion characteristics * **Technical Expertise:** Comprehensive support for material selection and processing * **Global Compliance:** Meets international standards and specifications * **Proven Reliability:** Extensive track record in critical applications **Additional Services:** - Custom cutting to specified lengths - Precision grinding services - Heat treatment processing - Surface preparation for sealing - Comprehensive material certification **Contact our technical team** for specific requirements and application engineering support. We provide complete solutions for your glass-to-metal sealing component manufacturing needs.

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 2744 gallon liquid totes Special package is available on request.