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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 400 (UNS N04400) seamless coiled tubing is a nickel-copper alloy renowned for its excellent corrosion resistance in a wide range of demanding environments, particularly in seawater, hydrofluoric acid, and alkaline solutions. It offers a unique combination of high strength, toughness, and weldability.
Key Features & Advantages:
- Excellent Corrosion Resistance: Demonstrates outstanding resistance to seawater and saltwater, exhibiting high resistance to chloride-ion stress-corrosion cracking. It also resists corrosion by hydrofluoric acid and alkaline solutions across a wide concentration and temperature range.
- Good Mechanical Properties: Maintains good strength and toughness over a wide temperature range, from cryogenic temperatures up to about 480°C (900°F).
- Low Magnetic Permeability: Exhibits essentially non-magnetic properties, making it suitable for applications where magnetic interference must be avoided.
- Ease of Fabrication and Welding: Can be readily welded and fabricated using techniques common to nickel-base 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 systems.
Material Composition (Chemical Requirements per ASTM B163):
The balanced nickel-copper composition is the foundation of its properties. The typical composition ranges are as follows:
| Element | Content (%) | Role |
| Nickel (Ni) | 63.0 – 70.0 | Provides corrosion resistance and forms the base of the alloy. |
| Copper (Cu) | 28.0 – 34.0 | Enhances resistance to reducing acids and provides solid solution strength. |
| Iron (Fe) | 2.5 max | Balances corrosion resistance and cost. |
| Manganese (Mn) | 2.0 max | Aids in deoxidation during melting and improves forgeability. |
| Carbon (C) | 0.3 max | Kept low to prevent carbide precipitation and maintain corrosion resistance. |
| Silicon (Si) | 0.5 max | Improves resistance to oxidation and high-temperature scaling. |
| Sulfur (S) | 0.024 max | Impurity, kept very low to prevent hot shortness and maintain ductility. |
Typical Specifications (Customizable):
- Material Grade: UNS N04400 / ASTM B163 / W. Nr. 2.4360 / BS3075/6 NA13 (Monel 400)
- 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 B163, ASTM B165
Primary Applications:
This versatile nickel alloy tubing is specified for demanding applications across various industries:
- Marine & Offshore: Seawater piping systems, pump shafts, valve components, and fasteners due to its outstanding resistance to seawater corrosion.
- Chemical Processing: Equipment for handling hydrofluoric acid (HF), alkaline solutions, sulfuric acid, and other corrosive chemicals.
- Oil & Gas Production: Components exposed to sour (H₂S-containing) production fluids and brines.
- Power Generation: Feedwater heaters and other components in power plants.
- Aerospace & Military: Applications requiring non-magnetic, corrosion-resistant components.
| Grade | UNS Number | EN Name | EN Number | JIS | ASTM | ASME | AMS | MIL-T | BS/EN | Other |
| Alloy 600 | N06600 | NiCr15Fe | 2.4816 | B163, B167, B829 | SB163, SB167 | 5580 | Nace MR0103, Nace MR0175 | |||
| Alloy 625 | N06625 | 2.4856 | B444, B829 | SB444 | 5581 | Nace MR0103, Nace MR0175 | ||||
| Alloy 22 | N06022 | 2.4602 | B622, B829 | SB622 | Nace MR0103, Nace MR0175 | |||||
| Alloy C276 | N10276 | 2.4819 | B622, B829 | SB622 | Nace MR0103, Nace MR0175 | |||||
| Alloy 230 | N06230 | NiCr22W14Mo | 2.4733 | B622, B626 | SB622, SB626 | Nace MR0103, Nace MR0175 | ||||
| Alloy 400 | N04400 | B163, B165, B444 | SB163, SB165, SB444 | 4574 | 1368 | Nace MR0103, Nace MR0175 | ||||
| N200/N201 | N02200/ N02201 | B161, B163 | SB161, SB163 | Nace MR0103, Nace MR0175 | ||||||
| Alloy 825 | N08825 | B163, B423, B829 | SB163, SB423 | Nace MR0103, Nace MR0175 |
Why Choose TOKO TECH’s ALLOY 400 Coiled Tubing?
TOKO TECH ensures the highest quality through stringent process control. The manufacturing includes a solution annealing heat treatment to achieve optimal microstructure and corrosion performance, followed by 100% non-destructive testing (Eddy Current or Ultrasonic). Given its application in harsh environments and its premium nature, coils are typically protected with VCI (Vapor Corrosion Inhibitor) packaging or vacuum sealing to prevent any surface contamination or oxidation during transit and storage.
In summary, TOKO TECH’s ALLOY 400 (Monel 400) seamless coiled tubing provides a robust and highly reliable solution for severe corrosive applications, particularly those involving seawater, hydrofluoric acid, and alkalis. Its unique combination of properties makes it an indispensable material for engineers in the marine, chemical processing, and oil & gas industries.