Stainless steel strip for flue liners and flexible chimney tubes
Flue liners, flexible chimney tubes and chimney relining pipes.
Flue liners and flexible chimney tubes
Flexible chimney liners are interlocked or corrugated stainless steel pipes inserted into chimneys to exhaust flue gases from boilers and stoves. The strip must withstand acidic condensate and flue gas temperatures.
Flexible flue liners are exposed to acidic condensate, especially with condensing boilers and solid fuels, which is why AISI 316L is normally used for its better resistance to chloride and acid corrosion; for less demanding uses AISI 304, 201, 430 and austenitic 1% Ni (200 series, type J4) are also used. The strip is profiled and interlocked continuously, so width and thickness must be consistent for the seam to stay tight and uniform along the whole liner. 3S supplies thin annealed 2R/BA strip, typically 0.10 to 0.12 mm thick in widths from 30 to 150 mm, with good formability, EN or ASTM tolerances and 100% dimensional control. Spools with parallel or traverse winding feed profiling machines without interruption. A 3.1 certificate is available on request to support product documentation.
Where it is used
- Relining of existing chimneys
- Condensing boilers
- Stoves and biomass heaters
- Residential and industrial installations
Recommended grades
Supply
| Parameter | Range | Notes |
|---|---|---|
| Typical grades | AISI 316L, 304, 201, 430 and austenitic 1% Ni (200 series, type J4) annealed, 2R/BA finish; 316L for maximum resistance to condensate corrosion | Other grades on request |
| Thickness | Annealed 0.05 – 0.70 mm Work-hardened 0.05 – 2.50 mm | Typical for this application: 0.10 – 0.12 mm |
| Width | 3 – 1250 mm | Typical: 30 – 150 mm |
| Finishes | Annealed 2R / BA • Work‑hardened 2H | Calibrated mechanical properties |
| Formats | Strip • Narrow strips • Spools • Sheets | Sheets cut to size up to 1000 mm |
| Spools | From 15 kg to 1500 kg | ID 50–400 mm • traverse or parallel winding |
Tolerances according to EN ISO 9445 or customer specification. 3.1 certificates on request.
Frequently asked questions
Request a quoteWhy is 316L preferred over 304 for flue liners?
Does thickness affect liner flexibility?
How can I get a quote?
Tell us the alloy, finish, thickness, width, edge and format (strip/narrow strip/spool) and we will send you a quick quotation.