Welded stainless steel tube for heat exchanger, condenser, and HVAC applications, across grades 304, 316, and 321, from 6mm to 63.5mm OD with 0.4mm to 2mm wall thickness.
Heat exchanger, condenser, and HVAC tube does two jobs at once: it has to transfer heat efficiently across its wall, and it has to hold pressure and resist corrosion on both sides of that wall for years of continuous service. We manufacture tube for this application across 304, 316, and 321 — the right grade depends primarily on what's flowing through and around the tube, not on thermal performance alone, since all three conduct heat similarly well.
Heat exchanger tube is also frequently bent into U-shapes for compact bundle designs, which places real demands on the tube's ductility and requires the tube to be supplied in a condition that can take that bend without cracking or thinning unevenly.
| OD | 6mm to 63.5mm |
| Wall thickness | 0.4mm to 2mm |
| Grades | 304/304L, 316/316L, 321 |
| Standards | ASTM A249, ASTM A688 |
| Finish | As-welded, annealed & pickled, bright annealed |
| Grade | General positioning | Typically considered when |
|---|---|---|
| 304/304L | Good general corrosion resistance | Non-corrosive fluids, general-purpose thermal transfer |
| 316/316L | Adds molybdenum for chloride/corrosion resistance | Chloride-bearing or chemically aggressive process fluids, seawater-cooled condensers |
| 321 | Titanium-stabilized for weld-zone integrity at sustained heat | Higher-temperature operation, particularly where the tube is welded into the bundle |
Talk to us about your specific fluid, temperature, and pressure conditions — this table is a starting point, not a substitute for confirming your exact requirement with us.
All three grades used here are part of our 300 Series range — we manufacture every 300-series grade, so see the full tables if your application calls for a different one.
Grade, size, standard, quantity — send what you have and we'll respond with availability, lead time and pricing.