Stainless steel coil tubing is manufactured in one continuous length with OD from 1/4 to 1 inch and wall thickness from 0.035 to 0.065 inch, we are capable of producing long lengths of stainless tubing in coils, for some tubing sizes, and we can achieve coils that even up to 2000 m in length without any longitudinal or orbital welds, all the coil tubing is conducted 100% tested at the appropriate pressure.
ASTM A213 / A269 standard specification is applied for seamless coil tubing, ASTM A249 / A269 for welded coil tubing, and tubing coil is finished in bright annealing surface condition, generally, seamless coil tubing can be provided with no risk of impurities that are often associated with welding tube, seamless tubing is the preferred option for critical applications.
UK, USA, Australia, Canada and South Africa are the main markets for our coil tubing, we are a stainless steel coil tubing supplier and manufacturer in China, and the standard sizes include 1/4, 1/2, 3/8, 3/4, 1/8, and 5/8 inch, small coil and large coil diameter are available.
Stainless Steel Coil Tubing Specifications
| Type | Coil Tubing |
|---|---|
| tubing Specifications | ASTM, A269, ASTM A789 |
| Grades | 304/304L, 316/316L, 321, 2205 C276, 625, 825, 800/800H |
| Outside Diameter | 6.35, 7.94, 9.53, 12.7, 15.88, 19.05, 25.4, 38.1 mm |
| Wall Thickness | 0.51, 0.71, 0.89, 1.0, 1.2, 1.5 mm |
| Length | Max 10000 meters |
| Condition | Bright Annealing |
| Package | wooden drum or spool, metal reels |
| Application | Heat Exchanger, Boiler, Heating elements, High Pressure, Control lines, hydraulic and instrumentation systems |
| Advantages | Precision bending Smooth bends Surface roughness Ra < 0.5 μm Standard tolerance: ASTM A269, or D4/T3 Leak – Air Under Water Custom length Varieties of alloys |
304/304L Stainless Steel Coil Tubing
304 grade is a typical 18/8 Cr/Ni stainless steel material, it possesses good corrosion resistance and properties to meet many applications, it is a cost-effective and affordable grade, 304L is low carbon 304 grade.
304/L (UNS S30400/UNS S30403) Chemical Composition % (Max.)
| Cr Chromium | Ni Nickel | C Carbon | Mo Molybdenum | Mn Manganese | Si Silicon | Ph Phosphorus | S Sulfur |
|---|---|---|---|---|---|---|---|
| 18.0-20.0 | 8.0-12.0 | 0.030 | 0.0 | 2.00 | 1.00 | 0.045 | 0.30 |
However, 304/304L is unsuitable for saltwater environments because corrosion may occur in Chloride conditions.
316/316L Stainless Steel Coil Tubing
316 stainless steel is the second used grade, it contains 2.0 – 3.0 molybdenum element which makes it better corrosion resistance than 304, and for this reason, it is a good option for marine applications.
316/L (UNS S31600/UNS S31603) Chemical Composition % (Max.)
| Cr Chromium | Ni Nickel | C Carbon | Mo Molybdenum | Mn Manganese | Si Silicon | Ph Phosphorus | S Sulfur |
|---|---|---|---|---|---|---|---|
| 16.0-18.0 | 10.0-14.0 | 0.030 | 2.0-3.0 | 2.00 | 1.00 | 0.045 | 0.30* |
Nickel Alloy 825, 625 Coil Tubing
| Grade | UNS | C（Max.） | Cr | Ni | Mo | Others |
|---|---|---|---|---|---|---|
| Alloy 825 | N08825 | 0.03 | 20 | 38.5 | 2.6 | Cu=1.7, Ti=0.7 |
| Alloy 625 | N6625 | 0.1 | 21.5 | >=58 | 9 | Nb=3.5 |
After annealing, straightened stainless steel tubing is in soft condition, tubing can be bent, formed and fabricated in various directions and angles, small diameter and thin wall coil tubing are available for special applications.
Stainless Steel Coil Tubing Dimensions
Stainless steel tube is designed in coiling form, generally, a small diameter of the coil and maximum tube length can be 1000 meters, without any joint metal, there is a large range of sizes of stainless steel tubing for coiling, the standard outside diameter is given below, and wall thickness ranges from 0.0275 inch – 0.083 inch, maximum length reach to 1000 meters.
BWG gauge is usually defined as the wall thickness of the tubing, checking more sizes.
Outside Diameter
- 1/8“
- 3/16“
- 1/4“
- 5/16“
- 3/8“
- 1/2“
- 5/8“
- 7/8“
- 3/4“
- 1”
- 1”-1/2“
Wall Thickness
- 0.02″
- 0.035″
- 0.049″
- 0.065″
- 0.083″
Stainless Steel Coil Tubing Manufacturing
The production process of extra-long stainless steel coiled tubes is based on cold rolled tubes and cold-drawn to ensure the durability and flexibility of the material to achieve a soft state (HRB ≤ 90). It allows customers to bend easily and make leak-free connections for use in all complex environments.
Heat treatment process used in the vacuum bright heat treatment process, the internal and external surfaces of the stainless steel tube will not be in contact with oxygen and do not produce oxidation skin, so the internal and external surfaces of the stainless steel coils are cleaner, brighter, more delicate, surface roughness 0.4μm below.
The finished products of ultra-long stainless steel seamless coils have passed the pneumatic confinement test and eddy current flaw inspection, and we can add the hydraulic test (10MPa-35MPa) and ultrasonic flaw inspection according to the customer’s demand; we will provide the inspection report.
Mill finish and bright annealed finishes can be chosen for coil tubing, if required, a precise drawn process is available to obtain tight dimensions, bright annealing tube has a smooth surface. Coiled tubing can be formed in various shapes depending on applications, for example, helical coil and horizontal tube.
Benefits of Coil Tubing
The traditional method of welding long stick tubing end to end or with fittings is a very labor-intensive procedure., this welding process is prolonged and costly, and using coil tubing not only takes a fraction of the time, reducing labor costs, but it also provides for a much safer and maintenance free installation.
- Increased corrosion resistance, thanks to stainless steel, duplex and nickel alloy properties.
- Improved reliability—using fewer mechanical fittings or welds reduces the opportunity for defects, such as leaks and other long-term failures
- Reduced installation labor costs—installing a continuous length of tube takes less time and is more reliable than coupling multiple shorter lengths
Stainless Steel Coil Tubing For Heat Exchanger
Long stainless steel seamless coils are widely used in oil drilling, shipbuilding, aerospace and petrochemical refining equipment, spiral wound tube heat exchanger, wound tube heat exchanger and cold treatment of the chemical industry, gas piping, fluid piping, steam insulation pipe and cable, stainless steel tracer coils (tracer coils), high-pressure fluid piping, stainless steel heat insulation and adiabatic piping and cable, PVC sheathing protection of anti-corrosive stainless steel piping cable, umbilical cables and other industries.
Industrial stainless steel tubing coil applied for heat exchangers, boilers, oil, chemicals, fertilizers, chemical fiber, pharmaceuticals, nuclear power and so on.
Fluid stainless steel coil tube applied for beverages, beer, milk, water supply systems and medical equipment.
Mechanical structure with stainless steel coil tube applied for printing and dyeing, printing, textile machinery, medical equipment, kitchen equipment, automotive and marine accessories, construction and decoration.
Typical applications of stainless steel coil tubing:
- Evaporator Coil Tubing
- Solar Heater Coil Tubing
- Bear Cooling Coil Tubing
- Condenser, Boiler Coil Tubing
- Cooling Tower Coil Tubing
- Steam Coil Tubing
Range of Heat Exchangers
Chilled Water Coils – Hot Water Coils – Direct Expansion (Evaporator) Coils – Condenser Coils – Steam Coils – Chilled Beam Coils – Active Beam Coils
Control Line Coiled Tube
Coiled tubes for the control line are usually made of stainless steel, duplex stainless steel or nickel alloys, including stainless steel 316L, duplex 2205 and 2507, Nickel alloy 825 and alloy 625. The coiled tubes can be welded & redrawn tubes or seamless cold-drawn tubes. Control lines are very long continuous lengths coil, coiled tubing usually packed on coil wound on wooden drum or spool, also specific metal reels, Encapsulated and PVC coated are available.
- Downhole hydraulic control lines
- Downhole chemical control lines
- Subsea control lines for hydraulic power and chemical injection line
- Flowline control
- Instrumentation tubing
- Smooth inner surface control line tubing used in fiber optic applications
Stainless Steel Coil Tubing Sizes Chart
| OD, Inch | OD, Mm | WT, Inch | WT, Mm |
|---|---|---|---|
| 3/16 | 4.76 | 0.028 | 0.71 |
| 3/16 | 4.76 | 0.035 | 0.89 |
| 1/4 | 6.35 | 0.028 | 0.71 |
| 1/4 | 6.35 | 0.035 | 0.89 |
| 1/4 | 6.35 | 0.049 | 1.24 |
| 1/4 | 6.35 | 0.065 | 1.65 |
| 5/16 | 7.94 | 0.028 | 0.71 |
| 5/16 | 7.94 | 0.035 | 0.89 |
| 5/16 | 7.94 | 0.049 | 1.24 |
| 5/16 | 7.94 | 0.065 | 1.65 |
| 3/8 | 9.53 | 0.028 | 0.71 |
| 3/8 | 9.53 | 0.035 | 0.89 |
| 3/8 | 9.53 | 0.049 | 1.24 |
| 3/8 | 9.53 | 0.065 | 1.65 |
| 1/2 | 12.7 | 0.035 | 0.89 |
| 1/2 | 12.7 | 0.049 | 1.24 |
| 1/2 | 12.7 | 0.065 | 1.65 |
| 1/2 | 12.7 | 0.083 | 2.11 |
| 5/8 | 15.88 | 0.035 | 0.89 |
| 5/8 | 15.88 | 0.049 | 1.24 |
| 5/8 | 15.88 | 0.065 | 1.65 |
| 5/8 | 15.88 | 0.083 | 2.11 |
| 3/4 | 19.05 | 0.035 | 0.89 |
| 3/4 | 19.05 | 0.049 | 1.24 |
| 3/4 | 19.05 | 0.065 | 1.65 |
| 3/4 | 19.05 | 0.083 | 2.11 |
| 1 | 25.4 | 0.035 | 0.89 |
| 1 | 25.4 | 0.049 | 1.24 |
| 1 | 25.4 | 0.065 | 1.65 |
| 1 | 25.4 | 0.083 | 2.11 |
| 6 | 1.00 | ||
| 6 | 1.20 | ||
| 6 | 1.50 | ||
| 8 | 1.00 | ||
| 8 | 1.50 | ||
| 10 | 1.00 | ||
| 10 | 1.50 | ||
| 12 | 1.00 | ||
| 12 | 1.50 | ||
| 12 | 2.00 | ||
| 14 | 1.00 | ||
| 14 | 1.50 | ||
| 14 | 2.00 | ||
| 15 | 1.00 | ||
| 15 | 1.50 |
