Nickel Alloy U-Bend Tubes

​Product Overview

Nickel Alloy U-Bend Tubes are critical components for heat exchangers, condensers, and high-temperature reactors, designed for harsh environments in petrochemical, nuclear power, and offshore industries. Crafted from premium grades like ​Inconel 625, ​Hastelloy C-276, and ​Monel 400, and compliant with ​ASTM B163, ​ASME SB622, and ​TEMA Standards, these tubes deliver unmatched resistance to chloride-induced corrosion, stress cracking, and high-temperature creep, with a service life exceeding 15 years.

​Product Specifications

​Material & Manufacturing

• Grades: Inconel 600/625/800HT, Hastelloy C-22/C-276, Alloy 20CB3
• Standards: ASTM B163/B704/B725, EN 10216-5, NACE MR0175
• Surface Finish: Annealed & Pickled, Electro-Polished (Ra≤0.5μm), Shot Peened

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Design & Dimensions

• Bend Radius: 1.5D to 5D (custom radii available)
• Diameter Range: Φ6mm to Φ50mm (Wall Thickness: 0.5mm-6mm)
• U-Bend Angle Tolerance: ±0.5° (laser-calibrated)

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Performance

• Temperature Range: -200°C to 1100°C (peak 1300°C)
• Pressure Rating: Up to ​15,000 PSI (ASME BPVC Section VIII)
• Corrosion Resistance: Withstands 98% sulfuric acid, seawater, molten sulfur

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Key Advantages

✅ ​Zero Intergranular Corrosion: Solution annealing eliminates carbide precipitation (ASTM G28A certified).
✅ ​Vibration Fatigue Resistance: CNC bending ensures wall thinning <8% at bends.
✅ ​Low Maintenance: Electro-polished (EP) inner walls reduce scaling by 90%.
✅ ​Bespoke Solutions: Custom U-bend shapes, PTFE linings, API 6A completion specs.

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Applications

• ​Petrochemical: Hydroprocessing reactor bundles, sulfur recovery exchangers
• ​Nuclear Power: Steam generator U-tubes (NQA-1 nuclear certified)
• ​LNG Cryogenics: Sub-zero coiled-tube exchangers (-196°C)
• ​Offshore Platforms: Seawater desalination, oil/gas cooling
• ​New Energy: Molten salt thermal storage, hydrogen high-pressure exchangers

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Certifications

• ​International Compliance: ISO 9001/14001, PED 2014/68/EU, NORSOK M-650
• ​Testing Protocols:

• 100% Eddy Current Testing (ET) + Helium Leak Detection (1×10⁻⁹mbarL/s sensitivity)
• Intergranular Corrosion (ASTM G28), Stress Corrosion Cracking (SCC) tests

​Traceability: Mill Test Certificates (MTC) with heat treatment batch codes

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Packaging & Logistics

• ​Rust-Proof Packaging: VCI film + foam spacers + steel-framed crates.
• ​Special Handling: -50°C containers (cryogenic tubes), air-ride trucks (nuclear-grade).
• ​Lead Time: 25-35 days (standard), 50-70 days (nuclear/API custom orders).

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Why Choose Us?

🔹 ​Global Top 3 Capacity: Fully automated CNC bending centers (2M linear meters/month).
🔹 ​R&D Partnerships: Co-developed high-temperature sulfur corrosion solutions with Shell R&D.
🔹 ​Data-Driven Support: Free ANSYS Fluent flow resistance simulation reports.
🔹 ​Zero Inventory Burden: JIT production (MOQ 50 meters).