​​UNS N06600 / EN 2.4816 / ASTM B167 / W. Nr. 2.4816 (Inconel 600) Welded Coiled Tubing ​

​​Shanghai Toko Tech Co., Ltd.​​ is a professional manufacturer and supplier of high-performance special alloy pipes and components. While renowned for its seamless products, TOKO TECH also provides ​​ALLOY 600 (UNS N06600) welded coiled tubing​​, offering a cost-effective solution for high-temperature applications that require excellent oxidation resistance and mechanical strength, while benefiting from the economic advantages of the welding process and the installation convenience of long continuous lengths.

​​Key Features & Advantages:​​

​​Excellent High-Temperature Oxidation Resistance:​​ Maintains the core characteristic of ALLOY 600, forming a protective chromium oxide layer that provides outstanding resistance to oxidation at temperatures up to ​​1177°C (2150°F)​​. This makes the welded coil 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.

​​Cost-Effectiveness:​​ Welded tubing typically has a lower production cost compared to seamless tubing, providing an economical alternative for projects where the extreme pressure ratings of seamless tubing are not required, but core high-temperature material properties and long lengths are essential.

​​Continuous Coiled Length:​​ Supplied in long continuous coils, eliminating multiple connection points and simplifying installation in complex high-temperature systems such as furnace radiant tubes and heat treatment fixtures.

​​Manufacturing Process & Quality Focus:​​

The tubing is formed from precision-rolled ALLOY 600 strip (with controlled composition: Ni ≥72%, Cr 14-17%, Fe 6-10%, C ≤0.15%), which is then longitudinally welded using advanced ​​Tungsten Inert Gas (TIG) or Laser Welding​​ processes under protective atmosphere to ensure a clean, high-integrity weld. A critical step is the ​​solution annealing heat treatment​​ at 1038-1149°C (1900-2100°F) of the finished coil, followed by ​​pickling & passivation​​. This process dissolves any carbides that may have formed during welding, restores the corrosion and oxidation resistance in the weld heat-affected zone (HAZ), and ensures a uniform, passive surface finish.

​​Typical Specifications (Customizable):​​

​​Material Grade:​​ UNS N06600 / EN 2.4816 / ASTM B167 / W. Nr. 2.4816 (Inconel 600)

​​Outer Diameter (O.D.):​​ φ6.0 mm ~ φ25.0 mm (Common range for welded coils)

​​Wall Thickness (W.T.):​​ 0.5 mm ~ 2.5 mm (Varies with O.D.)

​​Coil Length:​​ Several hundred meters per continuous coil.

​​Standard:​​ ​​ASTM B167​​ (Seamless) & ​​ASTM B517​​ (Welded) for Nickel-Chromium-Iron Alloy Tubing

​​Primary Applications:​​

This welded coiled tubing is suitable for a variety of high-temperature applications where oxidation resistance is paramount, but maximum pressure capability is not the primary concern, including:

​​Heat Treating Industry:​​ Radiant tubes, muffles, retorts, and basket fixtures in carburizing, nitriding, and annealing furnaces.

​​Chemical & Petrochemical Processing:​​ Equipment for handling caustic solutions and other corrosive chemicals at elevated temperatures.

​​Power Generation:​​ Low-pressure sections of superheater and reheater systems, and other high-temperature components in fossil fuel power plants.

​​Industrial Heating:​​ Heating element sheaths, thermowells, and other high-temperature furnace components.

​​Automotive & Aerospace:​​ Exhaust system components and various high-temperature sensor protections.

​​Why Choose TOKO TECH’s ALLOY 600 Welded Coiled Tubing?​​

TOKO TECH ensures the quality of its welded product through stringent control. The process includes ​​100% weld seam inspection​​ (via eddy current testing) to ensure integrity. The mandatory ​​full coil solution annealing and pickling & passivation treatment​​ is crucial for achieving the optimal microstructure and high-temperature performance. The 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 welded coiled tubing provides a ​​cost-efficient and reliable solution​​ for high-temperature applications requiring exceptional oxidation, carburization, and corrosion resistance. It combines the material benefits of ALLOY 600 with the economic and installation advantages of welded coiled tubing, making it a valuable choice for engineers in the heat treatment, chemical processing, and power generation industries for medium-pressure, high-temperature duties.