Products Description
Product Specifications
| Standards | EN 10217-7 |
| Steel Grades | X2CrNi18-9 X2CrNi19-11 X2CrNiN18-10 X5CrNi18-10 X6CrNITI18-10 X6CrNiNb18-10 X2CrNiMo17-12-2 X5CrNiMo17-12-2 X6CrNiMoTi17-12-2 X2 CrNiMo17-12-3 X2CrNiMoN17-13-3 X3CrNiMo17-13-3 X2CrNiMo18-14-3 X2CrNiMoN17-13-5 X2CrNiMo18-15-4 X1NiCrMoCu31-27-4 X1NiCrMoCu25-20-5, etc. |
| Equivalent Standards | ASTM A312/A269, ASTM A778, JIS G3459, etc. |
| Outer Diameter (OD) | 6 mm –108 mm |
| Wall Thickness (WT) | 0.5 mm – 3 mm |
| Length | Customized |
| Surface Treatment | Pickled, bright annealed, polished or as specified |
| Production Process | TIG/laser welding/ Cold Drawn / Cold Rolled |
| Condition | Annealed |
TORICH stainless steel tube coils are manufactured from materials such as 304 and 316 stainless steel, offering excellent corrosion resistance against condensate, chilled water, and various corrosive media commonly found in HVAC systems.
Supplied in coil form, these tubes reduce the number of pipe joints by over 80%. Manufactured using laser welding technology and verified through EN 10217-7 standard hydrostatic and eddy current testing, the coils exhibit zero leakage at rated operating pressures, thereby preventing fluid leakage and pressure loss issues in HVAC systems.
Customized Services
- We can manufacture products with special outer diameters (such as non-standard sizes like Φ16, Φ20, and Φ30 mm) and custom wall-thickness combinations based on design drawings to meet specific system pressure requirements.
- We offer various surface treatments, including mechanical polishing (180#, 240#, 320#, 400#, and 600#), electropolishing (EP), bright annealing, and pickling & passivation.
- We support bending processes such as 2D and 3D bending, fixed-radius bends, and multi-angle bending.
Chemical Composition
| Element | C, max. | Si, max. | Mn, max. | P, max. | S, max. | Cr | Ni | Mo | N, max. |
|---|---|---|---|---|---|---|---|---|---|
| 1.4301 / 304 | 0.070 | 1.00 | 2.00 | 0.045 | 0.015 | 17.0–19.5 | 8.0–10.5 | - | 0.10 |
| 1.4307 / 304L | 0.030 | 1.00 | 2.00 | 0.045 | 0.015 | 17.5–19.5 | 8.0–10.0 | - | 0.10 |
| 1.4401 / 316 | 0.070 | 1.00 | 2.00 | 0.045 | 0.015 | 16.5–18.5 | 10.0–13.0 | 2.0–2.5 | 0.10 |
| 1.4404 / 316L | 0.030 | 1.00 | 2.00 | 0.045 | 0.015 | 16.5–18.5 | 10.0–13.0 | 2.0–2.5 | 0.10 |
Mechanical Properties
| Property | Rp0.2 min. (MPa) | Rp1.0 min. (MPa) | Rm (MPa) | Elongation, Longitudinal min. |
|---|---|---|---|---|
| 1.4301 / 304 | 195 | 230 | 500–700 | 40% |
| 1.4307 / 304L | 180 | 215 | 470–670 | 40% |
| 1.4404 / 316L | 190 | 225 | 490–690 | 40% |
| 1.4401 / 316 | 205 | 240 | 510–710 | 40% |
Possible Alternative Grades
- If the budget is limited and the system water has undergone rigorous treatment (such as adding corrosion inhibitors in closed chilled water systems), 1.4003 (ferritic stainless steel 409L/3Cr12) may be considered; however, its corrosion resistance is lower, making it unsuitable for environments with high chloride content.
- For applications involving media with low corrosivity-such as ventilation and dust extraction ducts or cable conduits-1.4016 (430) ferritic stainless steel is an option, though it has poorer weldability and lower toughness compared to austenitic stainless steel.
- For high-temperature hot water systems (>80°C) or steam tracing lines, 1.4571 (316Ti) may be considered, as it is suitable for long-term operation at temperatures up to 400°C.
Application areas
- Chilled-water circulation
- Hot-water circulation
- Condenser-water piping
- Glycol-water circulation
- Cooling-water lines
- Heating-water lines
Products Show
Testing Equipment
Factory Equipment
Pickling equipment
Polishing equipment
Cold drawing equipment
Products Package
FAQ
Q: Is the weld strength of welded steel pipes reliable?
A: It is completely reliable. The EN 10217-7 standard requires the weld zone to undergo solution treatment to eliminate residual welding stresses and microstructural changes in the heat-affected zone. Our products achieve a weld factor of 1.0 (meaning the weld strength equals that of the base metal), and every weld is verified via 100% in-line eddy current testing or hydrostatic testing to ensure there is no risk of leakage.
Q: What is the operating temperature range for the piping system?
A: The operating temperature range for 304L/316L austenitic stainless steel coiled tubing is -196°C to +400°C. In HVAC applications, chilled water systems (down to approx. -10°C with glycol solutions), standard hot and cold water systems (5–95°C), and high-temperature hot water systems (95–150°C) all fall within the safe operating range.
Q: Is 316L superior to 304L for chilled water systems?
A: Not necessarily. Due to its molybdenum content, 316L offers better resistance to localized corrosion caused by chloride ions. However, if water quality and environmental conditions are mild, 304L can meet the operational requirements at a lower cost.
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