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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 600 (UNS N06600) seamless coiled tubing is a nickel-chromium-iron alloy renowned for its exceptional resistance to high-temperature oxidation, carburization, and corrosion in various demanding environments. It maintains good mechanical properties over a wide temperature range and is particularly valued for its strength and workability.
Key Features & Advantages:
- Excellent High-Temperature Oxidation Resistance: Forms a protective chromium oxide layer, providing outstanding resistance to oxidation at temperatures up to 1177°C (2150°F). This makes it ideal for continuous high-temperature service.
- Resistance to Carburization and Sulfidation: Demonstrates good resistance to atmospheres containing carburizing and sulfur-bearing compounds, which are common in heat treatment and industrial furnace applications.
- Good Corrosion Resistance: Offers excellent resistance to corrosion by fresh and alkaline waters, along with good resistance to various organic and inorganic chemicals. It is highly resistant to chloride-ion stress-corrosion cracking.
- Good Mechanical Properties: Maintains high strength and toughness from cryogenic temperatures up to high temperatures. It also exhibits good fatigue strength.
- Seamless & Continuous Length: The seamless structure ensures maximum integrity for critical high-pressure and high-temperature applications. The long coiled length eliminates potential weak points from welds and simplifies installation.
Material Composition (Chemical Requirements per ASTM B167):
The balanced nickel-chromium composition is the foundation of its high-temperature properties.
| Element | Content (%) | Role |
| Nickel (Ni) | 72.0 min | Provides the base matrix, offering inherent corrosion resistance and high-temperature stability. |
| Chromium (Cr) | 14.0 – 17.0 | Imparts resistance to oxidation, sulfidation, and corrosion by forming a protective surface layer. |
| Iron (Fe) | 6.0 – 10.0 | Provides solid solution strength and helps balance cost. |
| Carbon (C) | 0.15 max | Kept low to prevent carbide precipitation at grain boundaries, which can affect corrosion resistance. |
| Manganese (Mn) | 1.0 max | Aids in deoxidation during melting. |
| Copper (Cu) | 0.5 max | Impurity, kept low to maintain corrosion performance. |
| Silicon (Si) | 0.5 max | Enhances resistance to high-temperature oxidation. |
| Sulfur (S) | 0.015 max | Impurity, kept very low to prevent hot shortness and maintain ductility. |
Typical Specifications (Customizable):
- Material Grade: UNS N06600 / ASTM B167 / W. Nr. 2.4816 / BS3076 NA14 (Inconel 600)
- 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 B167, ASTM B163
Primary Applications:
This versatile nickel alloy tubing is specified for high-temperature and corrosive applications across various industries:
- Heat Treating Industry: Radiant tubes, muffles, retorts, and furnace fixtures in carburizing and neutral heat treatment processes.
- Nuclear Power: Steam generator tubing and other components in pressurized water reactors (PWRs).
- Chemical & Petrochemical Processing: Equipment for handling caustic solutions, organic acids, and other corrosive chemicals at elevated temperatures.
- Aerospace & Gas Turbines: Combustion cans, thermocouple sheaths, and other high-temperature engine components.
- Power Generation: Superheater and reheater tubes in fossil fuel power plants.
Why Choose TOKO TECH’s ALLOY 600 Coiled Tubing?
TOKO TECH ensures the highest quality through stringent process control. The manufacturing includes a solution annealing heat treatment at ~1010-1050°C to dissolve carbides and achieve optimal microstructure and corrosion performance, followed by 100% non-destructive testing (Eddy Current or Ultrasonic). Given its application in high-temperature and harsh environments, coils are typically protected with VCI (Vapor Corrosion Inhibitor) packaging to prevent surface contamination during transit and storage.
In summary, TOKO TECH’s ALLOY 600 (Inconel 600) seamless coiled tubing provides a robust and highly reliable solution for severe high-temperature applications requiring exceptional oxidation, carburization, and corrosion resistance. Its unique combination of properties makes it an essential material for engineers in the heat treatment, nuclear, aerospace, and chemical processing industries.