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Shanghai Toko Tech Co., Ltd. is a professional manufacturer and supplier of high-performance special alloy pipes and components. Its ALLOY C-276 (UNS N10276) seamless coiled tubing is a nickel-molybdenum-chromium superalloy renowned as the industry benchmark for exceptional corrosion resistance in the most severe corrosive environments. This premium-grade material offers outstanding performance against both oxidizing and reducing media, making it the ultimate choice for handling aggressive chemical processes.
Key Features & Advantages:
- Exceptional Corrosion Resistance: Provides outstanding resistance to a wide range of severe corrosive environments, including strong oxidizing agents (chlorides, ferric chloride, cupric chloride), reducing acids (sulfuric, hydrochloric), and mixed acids (especially sulfuric-nitric-hydrochloric acid mixtures).
- Superior Pitting & Crevice Corrosion Resistance: The high molybdenum and chromium content results in an extremely high Pitting Resistance Equivalent Number (PREN >65), providing exceptional resistance to localized attack in chloride-containing environments.
- Excellent Stress Corrosion Cracking (SCC) Resistance: Demonstrates outstanding resistance to chloride-induced stress corrosion cracking, even in highly concentrated chloride solutions.
- Welding Compatibility: Maintains excellent corrosion resistance in the as-welded condition without requiring post-weld heat treatment, unlike earlier generation nickel-molybdenum alloys.
- Seamless & Continuous Length: The seamless structure ensures maximum integrity for critical applications. The long coiled length eliminates potential weak points from welds and simplifies installation in complex chemical processing systems.
Material Composition (Chemical Requirements per ASTM B622):
The exceptional corrosion resistance of C-276 is achieved through precise chemical balancing.
| Element | Content (%) | Role |
| Nickel (Ni) | Balance | Forms the matrix, providing inherent corrosion resistance and stability |
| Molybdenum (Mo) | 15.0 – 17.0 | Provides resistance to reducing environments and pitting/crevice corrosion |
| Chromium (Cr) | 14.5 – 16.5 | Imparts resistance to oxidizing environments and high-temperature oxidation |
| Tungsten (W) | 3.0 – 4.5 | Enhances overall corrosion resistance and provides solid solution strengthening |
| Iron (Fe) | 4.0 – 7.0 | Provides cost-effectiveness while maintaining corrosion performance |
| Cobalt (Co) | 2.5 max | Controls impurity levels to maintain corrosion resistance |
| Manganese (Mn) | 1.0 max | Aids in deoxidation during melting |
| Vanadium (V) | 0.35 max | Controlled impurity |
| Carbon (C) | 0.01 max | Kept extremely low to prevent intergranular corrosion |
| Silicon (Si) | 0.08 max | Controlled to maintain corrosion performance |
Typical Specifications (Customizable):
- Material Grade: UNS N10276 / EN 2.4819 / ASTM B622 / W. Nr. 2.4819 (Hastelloy C-276)
- Outer Diameter (O.D.): φ3.18 mm ~ φ27 mm (Common range for coils)
- Wall Thickness (W.T.): 0.5 mm ~ 2.0 mm (Varies with O.D.)
- Coil Length: Several hundred meters per continuous coil (exact length depends on O.D. and W.T.)
- Standard: ASTM B622, ASTM B619
Primary Applications:
This premium corrosion-resistant alloy tubing is specified for the most demanding applications across various industries:
- Chemical Processing: Reactors, columns, heat exchangers, and piping systems handling sulfuric acid, hydrochloric acid, acetic acid, and other aggressive chemicals
- Pollution Control: Flue gas desulfurization systems, scrubbers, and waste treatment equipment
- Pharmaceutical Industry: Critical process equipment requiring ultra-high purity and corrosion resistance
- Pulp & Paper Industry: Bleach plants and chemical recovery systems
- Marine & Offshore: Seawater cooling systems and components exposed to severe marine environments
Why Choose TOKO TECH’s ALLOY C-276 Coiled Tubing?
TOKO TECH ensures the highest quality through stringent process control. The manufacturing includes a solution annealing heat treatment at 1121-1177°C (2050-2150°F) to achieve optimal microstructure and corrosion performance, followed by 100% non-destructive testing (Eddy Current or Ultrasonic). Given its premium nature and application in extreme environments, coils are protected with vacuum sealing with inert gas to prevent any surface contamination during transit and storage.
In summary, TOKO TECH’s ALLOY C-276 seamless coiled tubing provides the ultimate corrosion-resistant solution for the most severe chemical processing environments. Its unmatched resistance to both oxidizing and reducing media makes it the material of choice when other alloys fail, offering unparalleled reliability for critical applications in chemical processing, pollution control, and other demanding industries.