304/304L Welded Coiled Tubing
Shanghai Toko Tech Co., Ltd. is a professional manufacturer and supplier of high-quality special alloy pipes and components. While renowned for its seamless products, TOKO TECH also provides 304/304L welded coiled tubing, offering a cost-effective alternative for applications where the extreme pressure ratings of seamless tubing are not required, but the benefits of long, continuous lengths and good corrosion resistance are essential.
Typical Specifications (Customizable):
Material Grade: UNS S30400 / S30403 | EN 1.4301 / 1.4307 | ASTM A269 TP304/304L
Outer Diameter (O.D.): φ6.0 mm ~ φ25.4 mm (Common range for welded coils)
Wall Thickness (W.T.): 0.5 mm ~ 2.0 mm (Varies with O.D.)
Coil Length:2000 meters per continuous coil.
Standard: ASTM A269, ASTM A632 (Welded Stainless Steel Mechanical Tubing)
Key Features & Advantages:
Cost-Effectiveness: Welded tubing typically has a lower production cost compared to seamless tubing, making it an economical choice for budget-conscious projects without compromising on core material properties.
Excellent Corrosion Resistance: Inherits the good general corrosion resistance of the 304/304L austenitic stainless steel grade, suitable for a wide range of environments, particularly against oxidizing acids and atmospheric corrosion.
Low Carbon Content (304L): The 304L grade (C ≤ 0.03%) minimizes the risk of sensitization (chromium carbide precipitation) during the welding process itself, ensuring good intergranular corrosion resistance in the weld zone without post-weld annealing.
Continuous Coiled Length: Like its seamless counterpart, it is supplied in long continuous coils, eliminating multiple connection points and simplifying installation in systems requiring long runs or complex routing.
Good Formability and Weldability: The base material is easy to form and weld, allowing for flexibility in fabrication and installation.
Manufacturing Process & Quality Focus:
The tubing is formed from precision-rolled strip (with a specified chemical composition of 304/304L), which is then longitudinally welded using advanced Tungsten Inert Gas (TIG) or Laser Welding processes. A critical step is the annealing and pickling of the finished coil to restore the corrosion resistance in the weld heat-affected zone (HAZ) and ensure a uniform, passive surface finish.
· Primary Applications:
This welded coiled tubing is suitable for a variety of lower-pressure applications where cost is a significant factor, including:
· Low-Pressure Instrumentation and Sensing Lines: For pneumatic signals, pressure gauges, and sensor connections.
· Food and Beverage Industry: Conveying fluids, gases, and ingredients in non-critical pressure applications.
· Architectural and Decorative Uses: Handrails, fluid systems in furniture, and other aesthetic applications.
· General Hydraulic and Pneumatic Lines: For low to moderate pressure systems
· Automotive Industry: Various fluid conveyance and protection sleeves.
Why Choose TOKO TECH's 304/304L Welded Coiled Tubing?
TOKO TECH ensures the quality of its welded product through stringent control. The process includes 100% weld seam inspection (often via eddy current testing) to ensure integrity, followed by a full annealing and pickling passivation treatment to maximize corrosion resistance. The coils are typically protected with VCI (Vapor Corrosion Inhibitor) packaging to prevent rust during transit and storage.
In summary, TOKO TECH's 304/304L welded coiled tubing provides a reliable and economical solution for applications that prioritize long continuous lengths, good corrosion resistance, and formability, but do not require the maximum pressure rating and uniform integrity of a seamless product. It offers a valuable alternative for cost-sensitive projects across various industrial and commercial sectors.
