01
SS 304 Corrugated Tube
SS 304 corrugated tube contains 18.0–20.0% chromium and 8.0–11.0% nickel, making it suitable for general water, sanitary, HVAC and moderate-corrosion service applications.
Stainless Steel Corrugated Tubes Manufacturer in India
MLTI Private Limited (Moonlight Tube Industries) manufactures, supplies and exports stainless steel corrugated tubes from Gujarat, India, with stainless tube production operations dating to 2008 and a rated combined capacity of nearly 8,000 MT per year. Corrugation is a secondary forming operation applied to a finished tube, and the resulting product is used in two distinct ways.
Corrugated stainless steel tubing is a flexible metal pipe with a ridged, wavy design. This unique shape allows the tube to bend easily and handle vibrations or temperature changes without breaking or needing rigid, straight connections.
The applicable specification depends on the base tube's manufacturing route and intended service. Welded corrugated tube starts from a flat-rolled strip. The strip edges are joined by an automatic welding process with no filler metal added. For ASTM A249 / ASME SA-249 supply, the tube is then cold worked after welding, solution annealed to the temperature the standard sets for the grade, and rapidly cooled. Every tube gets a hydrostatic or non-destructive electric test. Seamless tube is pierced from a solid billet, so there is no weld seam at all, and is supplied to ASTM A213 / ASME SA-213. Conversely, our stainless steel seamless corrugated tubes, produced from solid billets pierced into continuous tubes without weld seams for high-pressure resistance, meet ASTM A213 / ASME SA-213 specifications. General service options follow ASTM A269, with available grades including 304, 304L, 310, 316, 316L, 316Ti, 321, 321H, 347, 347H and 904L. Our company is certified with ISO 14001 and 45001, as well as EN 10204 3.1. For orders that qualify, PMI, tensile, and hardness testing are available.
Specifications of Stainless Steel Corrugated Tube
The base tube grades, applicable standards, corrugation configuration, dimensional range and connection options for our stainless steel corrugated tubing are listed below.
| Parameter | Value |
|---|---|
| Applicable standards | • ASTM A249 / ASME SA-249: Specification for welded austenitic steel boiler, superheater, heat-exchanger, and condenser tubes. • ASTM A213 / ASME SA-213: Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes. • ASTM A269: Specification for seamless and welded austenitic stainless steel tubing for general service. |
| Grades | 304, 304L, 310, 316, 316L, 316Ti, 321, 321H, 347, 347H, 904L |
| Corrugation | Secondary forming operation on the finished base tube |
| Manufacturing process | ERW welded, seamless |
| Outside diameter | 12.7 mm (1/2") to 101.6 mm (4") |
| Wall thickness | 0.20 mm to 0.80 mm, depending on diameter and pressure class. |
| Convolution geometry | Annular or helical, according to ordered pitch and depth |
| Construction | Unbraided, single-braided or double-braided |
| Covering | Bare or jacketed, where applicable |
| End connections | Plain end, threaded connector, flange, quick-release or camlock coupling |
| Length | Straight lengths or coils, cut to ordered length |
| Delivery condition | Base tube: solution annealed and pickled before corrugating, as the base tube standard requires. Flexible corrugated tube: supplied as formed, unless a post-forming anneal is asked for at order stage. Jacketed and braided assemblies: no post-forming heat treatment, since the jacket, braid and end fittings are already fitted. |
Stainless Steel Corrugated Tube Grades
Stainless steel corrugated tubes are available in eleven austenitic grades, with selection based on corrosion exposure, temperature, welding requirements and mechanical conditions. The available grades are listed below.
02
Alloy 304L Corrugated Tube
SS 304L corrugated tube limits carbon to 0.030% under ASME SA-249 for welded tube and to 0.035% under ASME SA-213 for seamless tube, reducing sensitisation after welding and making it suitable for fabricated assemblies requiring welded connections.
03
Stainless Steel 310 Corrugated Tube
SS 310 corrugated tube contains 24.0–26.0% chromium and 19.0–22.0% nickel, providing high-temperature oxidation resistance for heated processes and furnace-related applications.
04
Stainless Steel 316 Corrugated Tube
SS 316 corrugated tube contains 2.00–3.00% molybdenum, improving chloride pitting resistance for chemical processing, water systems and other chloride-bearing service conditions.
05
Alloy 316L Corrugated Tube
SS 316L corrugated tube combines molybdenum with a carbon maximum of 0.030% under ASME SA-249 for welded tube and 0.035% under ASME SA-213 for seamless tube, providing corrosion resistance and weldability for chemical, sanitary and process applications.
06
Alloy 316Ti Corrugated Tube
SS 316Ti corrugated tube is titanium-stabilised to resist chromium carbide precipitation during elevated-temperature exposure, making it suitable for thermally cycling process applications.
07
SS 321 Corrugated Tube
SS 321 corrugated tube is titanium-stabilised and designed for elevated-temperature service where resistance to chromium carbide precipitation is required during repeated heating cycles.
08
SS 321H Corrugated Tube
SS 321H corrugated tube has controlled carbon content that improves high-temperature strength, making it suitable for heated process connections and applications involving sustained elevated temperatures.
09
347 SS Corrugated Tube
SS 347 corrugated tube uses niobium stabilisation to resist intergranular corrosion after heating, making it suitable for elevated-temperature processes and chemical service applications.
10
Stainless Steel 347H Corrugated Tube
SS 347H corrugated tube combines niobium stabilisation with controlled higher carbon content, providing improved creep and stress-rupture strength for sustained high-temperature applications.
11
904L SS Corrugated Tube
SS 904L corrugated tube contains molybdenum, copper and higher nickel levels, providing strong corrosion resistance for aggressive chemical, sulphuric acid and chloride-bearing environments.
Stainless Steel Corrugated Tube Types
Stainless steel corrugated tubes are differentiated by convolution geometry, braid construction and application. Annular and helical profiles provide flexibility, while braided versions increase pressure resistance.
01
Annular Corrugated Tube
Annular corrugations form separate rings around the tube axis. This construction provides high flexibility over a relatively short length and is commonly used where repeated bending or installation movement must be accommodated.
02
Helical Corrugated Tube
A helical corrugated stainless steel tube has a continuous spiral convolution along its length. This stainless corrugated tube configuration is suitable for long coils and provides different flexibility and torsional characteristics from an annular profile.
03
Unbraided and Braided Construction
Unbraided corrugated tube provides the highest flexibility but has lower pressure capacity. One or two layers of stainless steel wire braid can be added to support pressure loads and protect the corrugated core during service.
04
Jacketed CSST and Bare Corrugated Tube
Jacketed corrugated stainless steel tubing, commonly referred to as CSST, places the corrugated metallic tube inside a polymer jacket for specific fuel-gas applications. Fuel-gas CSST systems are certified to CSA/ANSI LC 1 / CSA 6.26. That standard covers the tubing, fittings and striker plates together as one system. A tube on its own is not a certified CSST system.
Sizes of SS Corrugated Tube
Corrugated tube is specified first by the base tube's outside diameter and wall thickness, followed by convolution pitch and depth. The available stainless steel corrugated tube sizes are shown below.
| Nominal Size | Outside Diameter (mm) | Typical Wall Thickness (mm) |
|---|---|---|
| 1/2" | 12.7 | 0.20–0.50 |
| 3/4" | 19.05 | 0.20–0.60 |
| 1" | 25.4 | 0.20–0.60 |
| 1-1/4" | 31.75 | 0.20–0.70 |
| 1-1/2" | 38.1 | 0.20–0.70 |
| 2" | 50.8 | 0.20–0.80 |
| 2-1/2" | 63.5 | 0.30–0.80 |
| 3" | 76.2 | 0.30–0.80 |
| 4" | 101.6 | 0.30–0.80 |
Industrial Applications of Corrugated Stainless Steel Tube
Corrugated stainless steel tube is used in fuel-gas distribution, water systems, heating circuits, heat exchangers, process transfer, and expansion connections. Grade, braid, convolution profile, and end connection are selected according to pressure, temperature, fluid chemistry and required movement.
Fuel Gas Distribution
Jacketed corrugated stainless steel tubing provides flexible routing for fuel-gas connections between manifolds and equipment. CSST systems must be certified to CSA/ANSI LC 1 / CSA 6.26, with approved fittings and installation meeting applicable local gas-code requirements.
Water and Sanitary Plumbing
304 and 316L corrugated tubing can be used for flexible water connections where the product specification and local plumbing requirements permit. 316L is preferred where chloride levels make the additional pitting resistance useful.
Heating and Solar Thermal Circuits
Flexible stainless steel corrugated tubing connects solar collectors, storage vessels and heating equipment while accommodating thermal expansion and installation movement. The grade and sealing materials must be compatible with the circulating fluid and operating temperature.
Heat Exchangers
Corrugated heat exchanger tubes increase fluid mixing near the tube wall, which can improve the heat-transfer coefficient compared with a smooth tube. The improvement comes with increased pressure drop, so hydraulic performance must be considered with the thermal design.
Chemical and Steam Transfer
Braided corrugated metal hose assemblies are used for transferring selected chemicals, steam and process fluids where flexibility and temperature resistance are required. 316L is commonly considered for chloride-bearing media, while grade selection ultimately depends on the complete chemical environment.
Expansion Joints and Flexible Connectors
Corrugated stainless steel bellows and flexible assemblies can accommodate axial, lateral and angular movement in connected equipment. Service life depends on movement amplitude, cycle frequency, convolution geometry, temperature, and the number of operating cycles.
Shipping and Packaging of SS Corrugated Tubes
Our standard shipping and packaging protocols guarantee physical protection and reliable global logistics management.
- Coils are wrapped and strapped on suitable formers; straight lengths are bundled by diameter and protected for transport.
- Braided assemblies are supplied with fittings capped and braid protected against handling damage.
- Export orders can be arranged on FOB or CFR terms to Brazil, Vietnam, Turkey, and Europe.
- Pan-India dispatch is arranged from the Gujarat facility.
Why Choose MLTI Private Limited?
Buyers return to Moonlight Tubes for certified material, approved grades and stock that ships on schedule. Every order is backed by documented quality, a wide size range and delivery commitments we hold to.
Quality Certification
01
IBR & EIL Approved
02
Why
Choose Us
03
Wide Range of Grades & Sizes
04
Timely Global Delivery
Stainless Steel Corrugated Tubes FAQs
Base tube sizes run from 12.7 mm to 101.6 mm outside diameter, with wall thicknesses typically ranging from 0.20 mm to 0.80 mm. Corrugation pitch, depth and length are set for each order.
Because corrugation is a secondary forming operation, base tubing is manufactured to ASTM A249 / ASME SA-249, ASTM A213 / ASME SA-213, or ASTM A269. Finished flexible assemblies conform to application-specific standards such as ISO 10380 or BS 6501.
Available grades inclin ude 304, 304L, 310, 316, 316L, 316Ti, 321, 321H, 347, 347H, and 904L. Marine and chemical duties typically specify 316L or 904L, while stabilised (321/347) and H-grades are selected for elevated-temperature service.
Corrugations disrupt the fluid boundary layer and induce turbulence at lower velocities, improving heat transfer coefficients compared to smooth tubes, balanced against a calculated increase in fluid pressure drop.
CSST (Corrugated Stainless Steel Tubing) includes an extruded polymer jacket engineered primarily for fuel-gas distribution. Bare corrugated tubing has no outer jacket and is used for solar thermal systems, industrial water and process fluid duties.