304 Stainless Steel Coil Tubing, 1/4, 3/8, 3/4 Seamless And Welded coil tube
DONGSHANG stainless has many year of experience to offer stainless steel coil tubing with sizes from 1/4 to 1 in. and wall thickness from 0.035 to 0.065 in. , we are capable of producing long lengths of stainless tubing in coils, for some tubing sizes, we are able to achieve coils that even up to 2000 m in length without any longitudinal or orbital welds. ASTM A213 / A269 standard specification is applied for seamless stainless steel tubing, ASTM A249 / A269 for welded tube, with both bright annealing finish and annealing pickling finish, generally, seamless coil tubing can be provided in no risk of impurities that are often associated with welding tube, seamless tubing is the preferred option for critical applications.
Stainless Steel Coil Tubing Specifications
We are a specialist in producing coil tubing, having the expertise and techniques to meet tubing bend service, all the tubing is conducted in 100% tested at the appropriate pressure, tubing inner and outer surface is clean and try for packing.
- Precision bending
- Smooth bends
- Surface roughness Ra < 0.5 μm
- Standard tolerance: ASTM A269, or D4/T4
- Strength – Tensile, Burst
- Hardness – Rockwell, Micro
- Soundness – Eddy Current, Ultrasonic
- Leak & Strength – Hydrostatic
- Leak – Air Under Water
- Bend Testing – Reverse Bending, Flattening, Reverse Flattening, Flange
- Dimensional – OD, Wall, Straightness
- Metallurgical – Grain Size, Sensitization, Corrosion, Phase Balance/Intermetallic, Metallographic
Coil Tubing In Stainless Steel And Nickel Alloys
304/304L and 316/316Lare wide used grades in stainless steel group due to their excellent corrosion resistance and properties, these stainless steels have ability to resist high temperature, low temperature as well as high pressure, and they are cost effective material relatively.
304/304L Stainless Steel Coil Tubing
304 grade is 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 not suitable used in saltwater environment, because corrosion may occur in Chloride condition.
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 has 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, straighten 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 application.
Standard Stainless Steel Coil Tubing Dimensions
Stainless steel tube is designed in coiling form, general small diameter, maximum tube length can be 1000 meters, without any joint metal, there are a large range sizes of stainless steel tubing for coiling, standard outside diameter is given below, and wall thickness ranges from 0.0275 inch – 0.083 inch, maximum length reach to 1000 meters.
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 Finishes
Mill finish and bright annealed finishes can be chosen for coil tubing, if required, 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.
Advantages Of Coil Tubing
The traditional method of welding long stick tubing end to end or with fittings, it is a very labor intensive procedure., this welding process is very slow and costly, using coil tubing not only takes a fraction of the time, reducing labor costs, it also provides for a much safer and maintenance free installation.
- Increased corrosion resistance, thanks to stainless steel, duplex and nickel alloys properties.
- Improved reliability—using fewer mechanical fittings or welds reduces the opportunity for defect, such as leaks and other long-term failures
- Reduced installation labor costs—installing continuous length of tube takes less time and is more reliable than coupling multiple shorter lengths
Stainless Steel Coil Tubing For Heat Exchanger
Coil tubing is used for wide range of applications, applied for cooling and heating transferring energy in corrosive and non normal temperature environment, like food and beverage, oil and gas, medicine industry and so on, we manufacture and design coiled tubing to meet customer requirement in different sharps and purpose.
Industrial stainless steel tubing coil applied for heat exchangers, boilers, oil, chemicals, fertilizers, chemical fiber, pharmaceutical, 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 includes – 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 control line 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 has 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 fibre optic applications
