Buyers use the words pipe and tube loosely, but the catalogue draws the usual line. The stainless listings are dominated by tube: their titles name round, square and rectangular sections, seamless and welded construction, and pickled, brushed and mirror-polished finishes, across the austenitic grades 201, 304, 316 and 316L. Those are the words of the listing titles, stated collectively — not a promise that every grade is listed in every section, construction and finish. One listing states a single execution: a seamless TP316L pipe in Schedule 40S.
The stainless tube range sits next to the stainless fittings range, and the two are usually ordered together: tube for the runs, A403 fittings for the direction changes. The wall series for stainless follows the S-schedules of ASME B36.19 (5S, 10S, 40S, 80S) rather than the carbon schedule numbers — the difference matters at the weld, and our stainless elbow page explains the S suffix in full.
| Item | Range / Options |
|---|---|
| Grades | TP316L on the Schedule 40S seamless pipe listing; 201, 304, 316 and 316L named collectively in the tube range titles — the grade for a specific product is confirmed at enquiry |
| Forms | Round, square and rectangular sections named in the tube range titles; a sanitary pipe is likewise named in a listing title — the form for a specific product is confirmed at enquiry |
| Construction | Seamless and welded named in the tube range titles — the construction for a specific product is confirmed at enquiry |
| Finishes | Pickled, brushed and mirror polished named in the tube range titles; an HL finish is likewise named in a listing title — the finish for a specific product is confirmed at enquiry |
| Size range | Confirmed per product at enquiry — state the outside diameter or NPS with the order |
| Wall thickness | Confirmed per product at enquiry — state the S-schedule or the exact wall; Schedule 40S appears on the TP316L pipe listing |
Pipe or Tube — Why the Words Matter
Pressure pipe is ordered by nominal size and schedule: the outside diameter is fixed by the NPS, the schedule picks the wall. Tube is ordered by its actual outside diameter and wall thickness, which is why tube serves structural, heat-exchanger and sanitary work where the exact dimension is the point. When you enquire, state which system your specification uses — NPS plus S-schedule, or OD plus wall in millimetres — and the product will be confirmed on that basis.
Seamless or Welded
The tube range titles name both constructions. Seamless tube is drawn from a pierced billet with no weld seam — the default for pressure, high temperature and critical sanitary duty. Welded tube is formed from strip and welded along the seam, then sized and finished — economical, dimensionally consistent, and the standard choice for structural sections, handrails, and much sanitary and water work. The construction for a specific product is confirmed at enquiry.
Finishes: Pickled, Brushed, Mirror, HL
The tube range titles name pickled, brushed and mirror-polished finishes. Pickling removes the heat tint and scale from forming and welding and restores the passive surface — the working finish for process tube. Brushed finishes give a uniform satin grain for visible architectural and equipment work. Mirror polishing takes the surface to a reflective finish for sanitary and decorative duty, where cleanability and appearance both count. The titles also name an HL (hairline) finish — the fine continuous grain used on food and beverage equipment — in the same collective way. The finish for a specific product is confirmed at enquiry — state it on the order, because it is part of the product definition, not a packing note.
Ordering With the Fittings
A stainless line list usually combines tube from this page with fittings from the stainless fittings page and, where the line is flanged, the lap joint system that keeps the backing flange in carbon steel. Put both on one enquiry if you wish: the grade and wall of each item are assessed and confirmed for the specific product before order, and the list is quoted and packed as one package. Ordering tube and fittings together does not by itself confirm compatibility at any weld — each item is confirmed on its own grade and wall.
Frequently Asked Questions
Do you supply stainless pipe in 316L?
316L is one of the grades named in the catalogue tube listings, and a seamless TP316L pipe in Schedule 40S is also listed. The size and wall for a specific 316L product are confirmed against your enquiry before order.
What is the difference between stainless pipe and stainless tube?
Pipe is specified by nominal size and schedule and is meant for pressure conveyance; tube is specified by exact outside diameter and wall and serves structural, exchanger and sanitary work as well. The catalogue range covers both, so state the dimension system your specification uses.
Can stainless tube be supplied mirror polished?
Mirror polished is one of the finishes named in the catalogue tube listings, alongside pickled and brushed. The finish for a specific size and grade is confirmed at enquiry — name the finish on the order.
Do square and rectangular stainless tubes come in the same grades?
The tube range titles name round, square and rectangular sections and the 201, 304, 316 and 316L grades collectively; they do not state that every section is listed in every grade. The section and grade combination for a specific product is confirmed at enquiry.
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Send Your Specification
Tell us the size, schedule or pressure class, material grade and quantity for the stainless steel pipe you need. MOQ and lead time are confirmed in the quotation for your exact specification.