Products Description
Product Specifications
| Standards | ASTM A269/A269M |
| Steel Grades | TP304, TP304L, TP316, TP316L, TP321,etc. |
| Equivalent Standards | EN 10216-5 / EN 10312;JIS G3459/G4303 |
| Outer Diameter (OD) | 3 mm - 25 mm |
| Wall Thickness (WT) | 0.5 mm - 3 mm |
| Length | up to 100m |
| Surface Treatment | Bright annealed |
| Production Process | Cold drawing / cold rolling |
| Condition | Coiled, annealed and pickled / bright annealed |
TORICH stainless steel coil tube is supplied in continuous coils, minimizing the need for joints. With an elongation of ≥35% in the annealed soft state, it can be bent and coiled at any angle without springback, making it ideal for routing in confined boiler spaces and for complex piping layouts.
The tubing undergoes cold rolling/cold drawing and bright annealing; the outer diameter tolerance is controlled within ±0.05 mm, and the wall thickness tolerance is ±10% or better. The typical internal surface roughness is Ra ≤ 0.8 μm (with bright-annealed tubing achieving Ra 0.4–0.6 μm), which minimizes media residue and particle adhesion, ensuring rapid response and clog-free operation for pressure and differential pressure transmitter sensing lines.
Customized Services
- TORICH offers services for fixed-length coils and straight-cut tubing, allowing for customization to any length based on equipment layout and supporting precise, segmented cutting.
- Surface treatment options include BA (Bright Annealed), AP (Pickled and Passivated), and mechanical polishing of inner and outer walls; oxygen service piping can undergo degreasing, oil removal, and nitrogen purging/sealing.
- Customized end-finishing services-including square cutting, chamfering, deburring, flaring, and swaging-are available to meet the connection requirements for various instrumentation fittings and valves.
Chemical Composition
| Element | C max. | Si max. | Mn max. | P max. | S max. | Cr | Ni | Mo |
|---|---|---|---|---|---|---|---|---|
| TP304 | 0.080 | 1.00 | 2.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–11.0 | - |
| TP304L | 0.030 | 1.00 | 2.00 | 0.045 | 0.030 | 18.0–20.0 | 8.0–13.0 | - |
| TP316 | 0.080 | 1.00 | 2.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 |
| TP316L | 0.030 | 1.00 | 2.00 | 0.045 | 0.030 | 16.0–18.0 | 10.0–15.0 | 2.0–3.0 |
Mechanical Properties
| Property | Tensile Strength, min. | Yield Strength, min. | Elongation, min. | Hardness, max. |
|---|---|---|---|---|
| TP304 | 515 MPa | 205 MPa | 35% | HRB 92 |
| TP304L | 485 MPa | 170 MPa | 35% | HRB 92 |
| TP316 | 515 MPa | 205 MPa | 35% | HRB 95 |
| TP316L | 485 MPa | 170 MPa | 35% | HRB 95 |
Possible Alternative Grades
- 201 stainless steel is cost-effective and less expensive than 304; it is suitable only for standard civil boiler instrumentation piping operating under ambient temperature and pressure conditions without exposure to corrosive agents.
- For specialized industrial boiler applications involving strong acids or alkalis, high humidity, or extreme temperatures, 904L stainless steel is a suitable choice; its higher nickel and molybdenum content provides corrosion and high-temperature resistance far superior to that of 316L.
- If instrumentation piping is continuously exposed to the sensitization temperature range of 427–816°C, select TP321 or TP316Ti stainless steel; these grades are suitable for applications such as pressure-sensing lines for superheaters and reheaters or high-temperature steam sampling lines.
Application areas
ASTM A269 stainless steel coil tube is suitable for:
- Boiler pressure measurement lines
- Differential-pressure impulse lines
- Steam sampling lines
- Boiler water sampling systems
- Feedwater instrumentation
- Pressure transmitter connections
- Temperature measurement systems
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: Do you supply seamless or welded tubing?
A: We offer both. Seamless cold-drawn tubing is typically used for instrumentation coils to ensure strength and cleanliness; however, welded cold-rolled coils are also available for cost-sensitive applications or larger diameters. All welded tubing undergoes solution annealing and non-destructive testing.
Q: What are the standard supply lengths for coiled tubing?
A: Common coil lengths include 15 m, 30 m, 50 m, and 100 m, though custom lengths are available upon request. Straight tubing can be cut to 3 m, 6 m, or custom lengths.
Q: Do the tubes undergo hydrostatic testing or non-destructive testing?
A: Each coil undergoes hydrostatic testing or eddy current testing in accordance with ASTM A269 standards; additional testing-such as ultrasonic testing, air-tightness testing, and radiographic testing of welds-is also available.
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