​UNS N08825 / EN 2.4858 / ASTM B423/704 / W. Nr. 2.4858 (Incoloy 825) Seamless Coiled Tubing ​

​​Shanghai Toko Tech Co., Ltd.​​ is a professional manufacturer and supplier of high-performance special alloy pipes and components. Its ​​ALLOY 825 (UNS N08825)​​ seamless coiled tubing is a ​​nickel-iron-chromium alloy​​ with additions of molybdenum and copper, specifically designed to provide exceptional resistance to corrosive environments, particularly reducing acids and stress corrosion cracking. This alloy is renowned for its versatility in handling complex corrosive conditions across various industries.

​​Key Features & Advantages:​​

• ​​Excellent Corrosion Resistance:​​ Offers outstanding resistance to both oxidizing and reducing acids, including sulfuric and phosphoric acids. The combination of nickel, chromium, molybdenum, and copper provides broad-spectrum corrosion protection.
• ​​Superior Stress Corrosion Cracking (SCC) Resistance:​​ Demonstrates excellent resistance to chloride-ion stress corrosion cracking, making it ideal for applications where standard stainless steels would fail.
• ​​Good Resistance to Localized Attack:​​ The molybdenum content provides enhanced resistance to pitting and crevice corrosion in chloride-containing environments.
• ​​Oxidation Resistance:​​ Suitable for service in oxidizing atmospheres up to 540°C (1000°F) due to its chromium content.
• ​​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 systems.

​​Material Composition (Chemical Requirements per ASTM B423/704):​​

The corrosion resistance of ALLOY 825 is achieved through precise chemical balancing.

​​Typical Specifications (Customizable):​​

• ​​Material Grade:​​ UNS N08825 / EN 2.4858 / ASTM B423/704 / W. Nr. 2.4858 (Incoloy 825)
• ​​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 B423, ASTM B704

​​Primary Applications:​​

This versatile corrosion-resistant alloy tubing is specified for demanding applications across various industries:

• ​​Chemical Processing:​​ Equipment for handling sulfuric acid, phosphoric acid, and other aggressive chemicals in reactors, heat exchangers, and transfer lines
• ​​Oil & Gas Production:​​ Downhole tubing, casing, and components in sour (H₂S/CO₂) environments
• ​​Marine & Offshore:​​ Seawater cooling systems, ballast systems, and other components exposed to seawater
• ​​Pollution Control:​​ Scrubbers, waste treatment systems, and flue gas desulfurization equipment
• ​​Nuclear Fuel Processing:​​ Equipment for uranium ore processing and nuclear fuel reprocessing

​​Why Choose TOKO TECH’s ALLOY 825 Coiled Tubing?​​

TOKO TECH ensures the highest quality through stringent process control. The manufacturing includes a ​​solution annealing heat treatment​​ at 925-980°C (1700-1800°F) to achieve optimal microstructure and corrosion performance, followed by ​​100% non-destructive testing (Eddy Current or Ultrasonic)​​. Given its application in corrosive environments, coils are typically protected with ​​VCI (Vapor Corrosion Inhibitor) packaging​​ or ​​vacuum sealing​​ to prevent surface contamination during transit and storage.

​​In summary,​​ TOKO TECH’s ALLOY 825 seamless coiled tubing provides a robust and highly reliable solution for severe corrosive applications requiring exceptional resistance to reducing acids, stress corrosion cracking, and localized attack. Its balanced composition makes it an indispensable material for engineers in the chemical processing, oil & gas, and marine industries where reliability in harsh environments is critical.