Alloy 702,Inconel 702 Fittings,UNS N07702,E FORU

British Specs:，American Specs: AMS 5550 Sheet, Strip and Plate，German Specs:

### **Product Introduction: Alloy 702 / INCONEL® 702 Fittings (UNS N07702)** #### **Overview** INCONEL® 702 (UNS N07702) fittings are precision-engineered components designed for extreme high-temperature applications requiring exceptional oxidation resistance and reliable performance. These precipitation-hardenable nickel-chromium-aluminum alloy fittings maintain outstanding mechanical properties and structural integrity at temperatures up to 1200°C (2200°F), making them ideal for critical piping systems in aggressive thermal environments. --- ### **Key Features & Advantages** - **Exceptional oxidation resistance** up to 1200°C (2200°F) - **Excellent high-temperature strength** and creep rupture properties - **Superior resistance to carburization** and sulfidation - **Good thermal fatigue resistance** under cycling conditions - **Excellent structural stability** during prolonged high-temperature exposure - **Precise dimensional accuracy** and reliable performance --- ### **Chemical Composition (Typical % Weight)** | Element | Content (%) | Role in Alloy | |---------|-------------|---------------| | **Nickel (Ni)** | Balance | Matrix element providing high-temperature strength | | **Chromium (Cr)** | 14.0-17.0 | Primary oxidation resistance | | **Aluminum (Al)** | 2.75-3.75 | Forms protective alumina scale | | **Iron (Fe)** | 0.5-2.5 | - | | **Titanium (Ti)** | 0.25-0.75 | Precipitation hardening element | | **Zirconium (Zr)** | 0.01-0.10 | Enhances oxidation resistance | | **Manganese (Mn)** | 0.50 max | - | | **Silicon (Si)** | 0.50 max | - | | **Copper (Cu)** | 0.50 max | - | | **Carbon (C)** | 0.05 max | - | --- ### **Physical Properties** | Property | Value | |---------|-------| | **Density** | 7.95 g/cm³ (0.287 lb/in³) | | **Melting Point** | 1370-1425°C (2500-2600°F) | | **Thermal Conductivity** | 15.1 W/m·K at 20°C | | **Thermal Expansion** | 14.2 μm/m·K at 20-100°C | | **Specific Heat** | 460 J/kg·K at 20°C | | **Modulus of Elasticity** | 221 GPa (32 x 10^6 psi) | --- ### **Mechanical Properties (Aged Condition)** #### **Room Temperature Properties** | Property | Value | |---------|-------| | **Tensile Strength** | 830-1000 MPa (120-145 ksi) | | **Yield Strength (0.2% Offset)** | 520-670 MPa (75-97 ksi) | | **Elongation** | 18-28% | | **Hardness** | HRB 90-100 | | **Impact Strength** | 35-50 J (26-37 ft-lb) | #### **Elevated Temperature Properties** - **Stress Rupture Strength**: 55 MPa (8 ksi) at 980°C (1800°F) for 100 hours - **Creep Strength**: Excellent long-term performance at high temperatures - **Thermal Fatigue Resistance**: Superior performance under thermal cycling - **Pressure Integrity**: Maintains sealing capability at high temperatures --- ### **International Standards** | Standard | Specification | Application | |----------|---------------|-------------| | **ASTM** | B366 | Customized Fittings | | **ASME** | SB366 | Boiler and Pressure Vessel Code | | **MSS** | SP-43 | Lightweight Stainless Steel Fittings | | **UNS** | N07702 | Unified Numbering System | | **DIN** | 2.4665 | German Standard | --- ### **Product Range & Specifications** #### **Fitting Types Available** - **Elbows**: 45°, 90°, 180° angles - **Tees**: Equal and reducing types - **Reducers**: Concentric and eccentric - **Caps**: End closures - **Stub Ends**: Lap joint fittings - **Crosses**: Four-way connections #### **Size Range & Pressure Ratings** - **Pipe Sizes**: 1/8" to 24" NPS - **Wall Thickness**: Schedule 5S to XXS - **Pressure Ratings**: 150# to 2500# - **End Connections**: Butt-weld, socket-weld, threaded #### **Manufacturing Standards** - **Dimensional**: ASME B16.9, B16.11, B16.28 - **Tolerance**: Standard and special tolerances available - **Surface Finish**: Smooth ID/OD surfaces for optimal flow --- ### **Heat Treatment** **Standard Heat Treatment for Fittings:** - **Solution Treatment**: 1150-1200°C (2100-2200°F), rapid cooling - **Aging Treatment**: 800-850°C (1470-1560°F) for 16-24 hours, air cooling **Special Considerations:** - Uniform heating and cooling for complex geometries - Stress relief after forming operations - Solution annealing after welding operations - Controlled atmosphere for surface protection --- ### **Product Applications** #### **Industrial Heating & Heat Treatment** - **Furnace Piping Systems**: High-temperature furnace connections - **Radiant Tube Assemblies**: Heat treatment furnace components - **Thermocouple Assemblies**: High-temperature sensing systems - **Heat Treatment Lines**: Atmosphere and vacuum furnace piping #### **Chemical & Petrochemical Processing** - **Reformer Furnace Systems**: Hydrogen production units - **Cracking Furnace Piping**: Ethylene production plants - **High-Temperature Reactor Systems**: Chemical processing equipment - **Waste Heat Recovery Systems**: High-temperature exhaust connections #### **Power Generation** - **Gas Turbine Systems**: Exhaust and combustion air piping - **Heat Recovery Systems**: Steam generator connections - **Nuclear Applications**: High-temperature instrumentation lines - **Advanced Power Systems**: Supercritical CO₂ system components #### **Aerospace & Defense** - **Rocket Propulsion Systems**: Fuel and oxidizer line fittings - **Jet Engine Test Facilities**: High-temperature piping connections - **Space Vehicle Systems**: Thermal management system components - **Military Applications**: High-temperature hydraulic systems --- ### **Fabrication & Installation** #### **Welding Procedures** - **Preferred Method**: GTAW (TIG) for optimum quality - **Filler Metal**: INCONEL Filler Metal 72 - **Shielding Gas**: Argon or argon-helium mixtures - **Post-Weld Heat Treatment**: Recommended for optimal properties #### **Installation Guidelines** - **Proper Alignment**: Minimize installation stresses - **Support Design**: Accommodate thermal expansion - **Gasket Selection**: High-temperature compatible materials - **Bolting Materials**: Matching thermal expansion characteristics #### **Quality Control During Installation** - **Dimensional Verification**: Fit-up and alignment checks - **Weld Inspection**: NDT per applicable codes - **Pressure Testing**: Hydrostatic or pneumatic testing - **Documentation**: As-built records and certifications --- ### **Quality Assurance & Testing** #### **Material Certification** - **Chemical Analysis**: Verify composition compliance - **Mechanical Tests**: Tensile, hardness, impact properties - **Microstructure**: Grain size and phase distribution - **Traceability**: Heat number and material lot tracking #### **Non-Destructive Examination** - **Visual Inspection**: Surface quality assessment - **Dye Penetrant Testing**: Surface defect detection - **Radiographic Testing**: Internal quality verification - **Ultrasonic Testing**: Wall thickness and integrity #### **Dimensional Verification** - **Wall Thickness**: Ultrasonic measurement - **Outside Diameter**: Precision gauging - **Bevel Dimensions**: Weld preparation verification - **Angle and Straightness**: Geometric tolerance checking --- ### **Performance Characteristics** #### **Oxidation Resistance** - **Continuous Service**: Up to 1200°C (2200°F) - **Cyclic Oxidation**: Excellent resistance to spalling - **Scaling Resistance**: Minimal weight gain at high temperatures - **Surface Stability**: Forms protective, adherent oxide layer #### **Corrosion Resistance** - **Carburization Resistance**: Excellent in hydrocarbon environments - **Sulfidation Resistance**: Good performance in sulfur-containing atmospheres - **Chloride Resistance**: Moderate resistance to chloride attack - **Nitriding Resistance**: Good performance in nitrogen atmospheres --- ### **Why Choose Our INCONEL 702 Fittings?** - **Manufacturing Expertise**: Advanced fabrication technology - **Quality Assurance**: Comprehensive testing and certification - **Technical Support**: Engineering expertise for application guidance - **Global Standards Compliance**: Certified to international quality standards - **Proven Performance**: Established track record in critical applications - **Custom Solutions**: Tailored designs for special requirements **Contact us today for technical specifications and quotation for INCONEL 702 fitting products. Our engineering team provides comprehensive support from design through installation.** --- *Disclaimer: INCONEL® is a registered trademark of Special Metals Corporation. The information provided is for technical reference only. Final material selection should be verified through appropriate testing and engineering analysis for specific applications.*

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 2984 gallon liquid totes Special package is available on request.