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UNS N08904/EN 1.4539/ASTM A269 TP904L Seamless Coiled Tubing
Shanghai Toko Tech Co., Ltd. is a professional manufacturer and supplier of high-performance special alloy pipes and components. Its 904L (UNS N08904) seamless coiled tubing represents a premium-grade austenitic stainless steel specifically formulated with high molybdenum and copper content to deliver exceptional corrosion resistance in severe environments, particularly against sulfuric acid and chlorides.
Key Features & Advantages:
Exceptional Corrosion Resistance: The high alloy content (Molybdenum ~4.5%, Copper ~1.5%, and high Chromium and Nickel) provides superior resistance to a wide range of corrosive media, especially sulfuric acid, phosphoric acid, and chloride-containing solutions. It offers much better performance than standard 316/316L or 317L grades.
Excellent Resistance to Pitting & Crevice Corrosion: The high Molybdenum and Chromium content results in a very high Pitting Resistance Equivalent Number (PREN >36), making it highly resistant to localized attack in aggressive environments.
Good Stress Corrosion Cracking (SCC) Resistance: Its high Nickel content provides excellent resistance to chloride-induced stress corrosion cracking.
Seamless & Continuous Length: The seamless structure ensures the highest integrity and reliability for critical applications. The long coiled length eliminates weld joints, reducing potential leak points and simplifying installation in complex systems.
High-Quality Surface Finish: Produced through advanced cold drawing and bright annealing processes, resulting in a smooth, clean surface that minimizes the risk of contamination and fouling.
Typical Specifications (Customizable):
Material Grade: UNS N08904 / EN 1.4539 / ASTM A269 TP904L (Also complies with ASTM B673 for UNS N08904)
Outer Diameter (O.D.): φ3 mm ~ φ22 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 A269, ASTM B673, etc.
| Austenitic Stainless Steels | ||||||||||
| ALLOY DESIGNATION | COMMON SPECIFICATIONS | |||||||||
| Grade | UNS | EN | EN | JIS | ASTM | ASME | AMS | MIL-T | BS/EN | others |
| 304 | S30400 | X5CrNi18-10 | 1.4301 | SUS304 | A213, A269, A312 | SA213, SA269, SA312 | 5636 | – | BS 970 Pt. 4, BS EN 10216-5 | DIN 17458 |
| 304L | S30403 | X2CrNi18-9 | 1.4307 | SUS304L | A213, A269, A312 | SA213, SA269, SA312 | – | – | BS 970 Pt. 4, BS EN 10216-5 | DIN 17458 |
| 304H | S30409 | X6CrNi18-10 | 1.4948 | SUS304H | A213, A312 | SA213, SA312 | – | – | BS EN 10216-5 | – |
| 316 | S31600 | X5CrNiMo17-12-2 | 1.4401 | SUS316 | A213, A269, A312 | SA213, SA269, SA312 | 5507, 5647 | MIL-T-6736 | BS 970 Pt. 4, BS EN 10216-5 | DIN 17458 |
| 316L | S31603 | X2CrNiMo17-12-2 | 1.4404 | SUS316L | A213, A269, A312 | SA213, SA269, SA312 | – | – | BS 970 Pt. 4, BS EN 10216-5 | DIN 17458 |
| 316Ti | S31635 | X6CrNiMoTi17-12-2 | 1.4571 | SUS316Ti | A213, A269, A312 | SA213, SA269, SA312 | – | MIL-T-6736 | BS 970 Pt. 4, BS EN 10216-5 | DIN 17458 |
| 321 | S32100 | X6CrNiTi18-10 | 1.4541 | SUS321 | A213, A269, A312 | SA213, SA269, SA312 | – | MIL-T-6736 | BS 970 Pt. 4, BS EN 10216-5 | DIN 17458 |
| 321H | S32109 | X12CrNiTi18-9 | 1.4878 | – | – | – | – | – | BS EN 10216-5 | – |
| 347 | S34700 | X6CrNiNb18-10 | 1.455 | SUS347 | A213, A269, A312 | SA213, SA269, SA312 | – | MIL-T-6736 | BS 970 Pt. 4, BS EN 10216-5 | DIN 17458 |
| 347H | S34709 | X7CrNiNb18-10 | 1.4912 | – | – | – | – | – | BS EN 10216-5 | – |
| 904L | N08904 | X1NiCrMo/Cu25-20-5 | 1.4539 | A213, A269, A312, A1016 | SA213 | 10216-5,3651-2 | Nace MR0103,Nace MR0175 | |||
Primary Applications:
This ultra-high-end tubing is designed for the most demanding corrosive environments, including:
Chemical Processing: Core component for handling sulfuric acid, acetic acid, and other highly aggressive chemicals in reactors, heat exchangers, and transfer lines.
Pharmaceutical Industry: Critical process piping where extreme purity and corrosion resistance are paramount.
Oil & Gas (Upstream): For handling sour gas (H₂S and CO₂ containing) and high-chloride production fluids.
Sea Water & Marine Applications: Equipment exposed to seawater, such as cooling systems and piping.
Pulp & Paper Industry: Equipment for bleaching processes.
Why Choose TOKO TECH’s 904L Coiled Tubing?
TOKO TECH ensures the highest quality through stringent process control. The production includes solution annealing at optimal temperatures to ensure proper microstructure and corrosion performance, followed by 100% non-destructive testing (Eddy Current or Ultrasonic). Given the material’s premium cost and susceptibility to contamination, coils are typically protected with the highest level of packaging, such as vacuum sealing with inert gas or VCI (Vapor Corrosion Inhibitor) packaging, to prevent any surface corrosion or pitting during transit and storage.
In summary, TOKO TECH’s 904L seamless coiled tubing provides an ultra-reliable solution for the most severe corrosive applications where standard stainless steels fail. Its superior alloy composition offers unmatched resistance to sulfuric acid and chlorides, making it a critical material for engineers designing systems in the chemical processing, pharmaceutical, and offshore industries. The seamless, coiled form provides both maximum reliability and installation convenience.