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Creep-Resistant Inconel 617 Seamless Tube for Power Plant Superheaters
Engineered for ultra-supercritical power plant superheaters and reheater coils, our high-pressure solution annealed Inconel 617 seamless tubes deliver exceptional creep rupture resistance, thermal stability, and oxidation protection in extreme high-temperature operating environments.
- Overview
- Apecifications
- Features
- Applications
- Quality Assurance
- Advantages
- Recommended Products
Inconel 617 (UNS N06617 / Werkstoff 2.4663) is a solid-solution strengthened nickel-chromium-cobalt-molybdenum alloy designed for long-term service under combined high temperature and severe mechanical stress. Our cold-drawn, precision-annealed seamless tubing exhibits exceptional creep rupture strength at temperatures exceeding 980°C (1800°F), superior resistance to high-pressure steam oxidation, and metallurgical stability in power generation boiler systems. Every tube undergoes rigorous hydrostatic, ultrasonic, and eddy current non-destructive testing to ensure defect-free performance in critical heat transfer applications.
Product Overview
High-Temperature Solid Solution Strengthened Alloy 617 Tubing In modern ultra-supercritical (USC) and advanced ultra-supercritical (A-USC) power generation, superheater and reheater tubing operate under aggressive high-pressure steam and extreme flue gas thermal cycling. Inconel 617 seamless tubes provide the critical metallurgical reliability required for these harsh operating regimes.
The synergistic combination of high nickel and cobalt contents provides outstanding high-temperature matrix stability and creep resistance, while elevated chromium and aluminum additions form a dense, self-healing protective oxide scale that resists high-temperature oxidation and carburization. Molybdenum provides solid-solution strengthening across severe stress gradients.
Chemical Composition of UNS N06617 Seamless Alloy Tubing The chemical balance of Inconel 617 is tightly controlled to maintain microstructural stability and prevent secondary embrittling phase precipitation during extended elevated-temperature service:
| Element | Content Weight Percentage (%) |
|---|---|
| Nickel (Ni) | Balance (52.0 Min) |
| Chromium (Cr) | 20.0 - 24.0 |
| Cobalt (Co) | 10.0 - 15.0 |
| Molybdenum (Mo) | 8.0 - 10.0 |
| Aluminum (Al) | 0.8 - 1.5 |
| Titanium (Ti) | 0.6 Max |
| Iron (Fe) | 3.0 Max |
| Carbon (C) | 0.05 - 0.15 |
| Manganese (Mn) | 1.0 Max |
| Silicon (Si) | 1.0 Max |
| Copper (Cu) | 0.5 Max |
| Boron (B) | 0.006 Max |
Physical Properties and High-Temperature Mechanical Performance
| Technical Parameter | Metric Value | Imperial Value |
|---|---|---|
| Density | 8.36 g/cm³ | 0.302 lb/in³ |
| Melting Point | 1332 - 1380 °C | 2430 - 2516 °F |
| Tensile Strength (Room Temperature) | ≥ 700 MPa | ≥ 101.5 ksi |
| Yield Strength 0.2% Offset (Room Temperature) | ≥ 300 MPa | ≥ 43.5 ksi |
| Elongation at Break | ≥ 35 % | ≥ 35 % |
| Modulus of Elasticity (20°C) | 211 GPa | 30.6 × 10³ ksi |
| Maximum Continuous Operating Temperature | Up to 1100 °C | Up to 2012 °F |
| Supply Condition | Bright Solution Annealed / Pickled Solution Annealed | Bright Solution Annealed / Pickled Solution Annealed |
Key High-Temperature Performance Features and Creep Rupture Resistance
- Outstanding Creep-to-Rupture Strength: Maintains load-bearing structural integrity under continuous mechanical stress at temperatures above 980°C, drastically extending boiler tube service life.
- Exceptional Oxidation and Hot Corrosion Resistance: High chromium and aluminum contents generate a robust surface oxide barrier that resists hot gas scaling, steam-side oxidation, and fuel ash corrosion.
- Microstructural Phase Stability: Optimized cobalt and molybdenum ratios suppress phase embrittlement during prolonged thermal exposure, ensuring ductility throughout multi-year operating campaigns.
- Precision Dimensional Tolerances: Controlled cold working guarantees ultra-tight outer diameter (OD) and wall thickness (WT) tolerances, facilitating automated orbital welding and boiler header fabrication.
- High-Pressure Containment Capability: Uniform grain boundaries and defect-free inner bore surfaces ensure structural containment under severe steam pressure surges and cyclic thermal shocks.
Critical Industrial Applications in USC Superheaters and Advanced Energy Systems
- Ultra-Supercritical (USC) Power Generation: Final superheater tube bundles, reheater tubing, boiler pendant assemblies, and steam collector headers.
- Gas Turbine and Combined Cycle Systems: Combustor transition liners, fuel nozzle tubes, hot gas ducting, and heat recovery steam generator (HRSG) high-temperature circuits.
- Advanced Nuclear Systems: High-temperature gas-cooled reactor (HTGR) core heat exchangers, helium-to-helium recuperators, and steam reform loops.
- Petrochemical and High-Temperature Processing: Ethylene pyrolysis furnace coils, hydrogen reformer pigtails, thermowell protection tubes, and chemical process piping.
- Industrial Thermal Equipment: High-pressure heat treating furnace radiant tubes, recuperator systems, and incinerator heat exchange coils.
Quality Assurance, Tolerance Control, and Testing Capabilities Every production batch of Inconel 617 seamless tubes is subjected to strict quality control protocols:
- Non-Destructive Examination: 100% Ultrasonic Testing (UT), 100% Eddy Current Testing (ECT), and Hydrostatic Pressure Testing up to high-pressure design ratings.
- Mechanical Verification: Room-temperature and high-temperature tensile verification, flattening tests, flaring tests, and hardness profiling.
- Metallurgical Inspection: Microstructure grain size assessment, intergranular corrosion screening, and positive material identification (PMI) chemical spectroscopy.
- Dimensional Inspection: Full-length laser outer diameter measurement, ultrasonic wall thickness scanning, and surface roughness verification (Ra ≤ 0.8 μm upon request).
Why Partner with DLX for High-Temperature Nickel Alloy Tube Solutions
- Robust Production Capacity: With an integrated alloy melting, drawing, and annealing infrastructure delivering over 1,200 metric tons per month, we support both utility-scale capital projects and expedited maintenance outages.
- Full Chain Quality Traceability: From high-purity vacuum induction melting (VIM) and electroslag remelting (ESR) through precision cold finishing, every tube is backed by full EN 10204 3.1 material test certification.
- Engineering Customization: Custom outer diameters ranging from 6.0 mm to 76.2 mm with tailored wall thicknesses, straight lengths up to 18 meters, and specialized U-bend fabrication for boiler bundle configurations.
- Dedicated B2B Technical Support: Direct collaboration with metallurgical engineers to assist power plant EPC contractors, boiler manufacturers, and refinery maintenance managers with material selection and welding consultation.
