Stainless steel profiles and sections: angles, channels and T-sections
Stainless steel profiles and sections are the framing members behind stainless structures, supports and finishes, supplied as equal and unequal angle, channel and T-section in corrosion-resistant grades. ULAMEX supplies stainless sections in 304 and 316L to EN 10088-3, with a 3.1 certificate on request; laser-welded (laser-fused) sections are available to order. This guide covers the section forms, how they are made, grades, finishes, standards and where they are used.
What stainless steel sections are
A section is a long product with a shaped cross-section, an angle, a channel or a T, used to build frames, supports and edges where a flat bar or a round tube will not do the job. In stainless steel the section carries the same corrosion resistance as sheet and tube, so it is chosen wherever a structural or finishing member must resist rust in food, marine, chemical or architectural work. The grade sets the corrosion resistance, and the form is chosen for the load and the joint: angle for frames and edges, channel for beams and supports, T-section for partitions and stiffeners.
Section forms
| Form | Typical use |
|---|---|
| Equal angle | Frames, brackets, edge trims, corner supports |
| Unequal angle | Supports where one leg carries more load or reach |
| Channel (U-section) | Beams, supports, edge and cladding frames |
| T-section | Partitions, stiffeners, glazing bars and dividers |
| Flat and square section | Framing, base plates and infill members |
Angle is the most widely used stainless section, for frames, edges and light structural work. Channel handles heavier support spans, and T-section suits partitions and glazing details.
Hot-rolled and laser-welded sections
Stainless sections are made two ways, and the method affects the sizes, the corners and the price. Hot-rolled sections are formed from a single billet, giving a rounded root radius, and are limited to the sizes a mill rolls. Laser-welded (laser-fused) sections are built from strip and plate joined with a full-penetration laser seam, which gives a sharp, near-square corner and a very wide range of sizes and leg combinations that hot rolling cannot reach.
| Method | Character |
|---|---|
| Hot-rolled | Rounded root radius, standard mill sizes, economical for common sections |
| Laser-welded (laser-fused) | Sharp corners, full-penetration seam, very wide size and custom range |
For a standard angle or channel in a common size, hot-rolled is the economical choice; for a sharp architectural corner or a non-standard size, a laser-welded section is specified.
Grades for stainless sections
The grade is matched to the environment, exactly as for stainless sheet, tube and bar.
| Grade | Best for |
|---|---|
| 304 (1.4301) | General framing, dry and inland structural sections |
| 304L (1.4307) | Welded sections where low carbon avoids sensitisation |
| 316L (1.4404) | Marine, coastal, chemical and food sections |
| Duplex 2205 (1.4462) | High-strength and severe-chloride structural sections |
For the full grade detail see our guides to 304 and 316 stainless steel and duplex 2205: 304 for general framing, 316L wherever chlorides or food contact are involved, and duplex 2205 where high strength and severe chloride resistance are both needed.
Finishes
Sections are supplied in the finish the job needs, and the choice balances appearance against cost.
| Finish | Character and use |
|---|---|
| Mill / 1D (hot-rolled, pickled) | Matt structural finish for frames that are not on show |
| Brushed / satin (grain) | Directional satin for visible architectural sections |
| Polished | Bright reflective finish for feature and balustrade work |
For hidden framing, a mill or pickled finish is the economical choice; for visible architectural work, a brushed or polished section matches the surrounding sheet and tube.
Standards
Stainless sections are supplied to EN 10088-3, which sets the grades, composition and mechanical properties for long products. Angle dimensions follow EN 10056-1, and laser-welded sections are joined with a qualified full-penetration weld.
| Standard | Scope |
|---|---|
| EN 10088-3 | Grades, composition and delivery conditions for bars, rods and sections |
| EN 10056-1 | Dimensions for equal and unequal leg angles |
| EN 10088-1 | List of stainless grades and their properties |
State the grade, form, dimensions, finish and length with an enquiry, add the 3.1 certificate requirement, and note whether hot-rolled or laser-welded is preferred, so the delivered section matches the design.
How to specify a section
Angle is specified by leg lengths and thickness, channel by height, flange width and thickness, and T-section by flange, web and thickness, all supplied in standard mill lengths. Give the grade, form, dimensions and finish, state whether hot-rolled or laser-welded, and add the length and the 3.1 certificate requirement where the part needs them. For a welded structure, choosing a low-carbon grade such as 304L or 316L at the specifying stage avoids sensitisation at the joints later.
Applications
Stainless sections frame and finish work across sectors. Food and beverage plants use 316L angle and channel for hygienic frames, supports and machine bases that are washed down daily. Marine and coastal structures use 316L and duplex sections for railings, walkways and support steel. Architecture uses brushed and polished angle and T-section for facades, glazing, balustrades and feature trims. Chemical and process plants use stainless channel and angle for corrosion-resistant support steel, and general fabricators use 304 angle for frames, brackets and edges that must not rust.
Fabricating stainless sections
Stainless sections drill, weld and finish like other stainless products, with a matching low-carbon filler, 308L for 304 and 316L for 316. Keep sections and offcuts away from carbon steel tools and grinding media to avoid iron contamination that later rusts, and passivate welded joints to restore the passive layer. For welded structures a low-carbon grade avoids sensitisation, and for architectural work the weld and any grinding are blended and re-finished to match the section surface.
Bolting and joining sections
Sections are joined by welding or by bolting, and for a bolted stainless frame the fasteners are matched to the section grade to avoid a corrosion mismatch. A2 fasteners (304) suit inland and general frames, and A4 fasteners (316) suit coastal, marine and chemical structures, per ISO 3506. Carbon steel fasteners are kept out of a stainless frame, because the galvanic couple between carbon steel and stainless corrodes the fastener first in a damp environment. Where a stainless section must meet a carbon steel structure, an isolating washer or sleeve breaks the galvanic path so neither member suffers accelerated corrosion at the joint.
Stainless versus carbon sections
Stainless sections are chosen where corrosion resistance, hygiene or appearance justify the cost over carbon or galvanised sections. Carbon steel angle and channel are stronger for the price and suit dry, painted or enclosed structural work; galvanised sections handle outdoor structural use where a zinc coating manages corrosion. Stainless wins for food, marine, chemical and visible architectural sections, and wherever the frame must stay bright and rust-free for the life of the building. ULAMEX supplies stainless alongside carbon and galvanised steel, so a project sources the right section from one supplier.
Stainless steel profiles and sections from ULAMEX
ULAMEX has supplied stainless steel since 1988, and sections are a core part of the range.
| What you get | Detail |
|---|---|
| Forms and grades | Equal and unequal angle, channel and T-section in 304, 304L, 316L and duplex 2205 |
| Manufacture | Hot-rolled sections; laser-welded (laser-fused) available to order |
| Finishes | Mill / 1D, brushed satin and polished |
| Standards | EN 10088-3, with EN 10056-1 angle dimensions |
| Terms | 3.1 certificate on request, no minimum order on stocked SKUs, dispatch 2 to 7 working days |
Need stainless steel profiles or sections for a project? Send the grade, form, dimensions and finish, and ULAMEX will return a non-binding quotation. See our guide to stainless steel bar, browse the stainless steel range and our supply capabilities, or contact the export desk at [email protected] or +48 504 424 761.
Frequently asked questions
What stainless steel sections are available?
Equal and unequal angle, channel (U-section) and T-section, plus flat and square section. Angle is the most widely used, for frames, edges and light structural work, while channel handles heavier support spans.
What is the difference between hot-rolled and laser-welded sections?
Hot-rolled sections are formed from a single billet with a rounded root radius, in standard mill sizes. Laser-welded (laser-fused) sections are built from strip and plate with a full-penetration laser seam, giving sharp corners and a very wide range of sizes and custom leg combinations.
What grades are stainless sections available in?
304 (1.4301) for general framing, 304L (1.4307) for welded sections, 316L (1.4404) for marine, coastal and food work, and duplex 2205 (1.4462) for high-strength and severe-chloride structural sections.
What standard applies to stainless sections?
EN 10088-3 sets the grades, composition and delivery conditions for long products, and angle dimensions follow EN 10056-1. Laser-welded sections are joined with a qualified full-penetration weld.
Which grade should I use for a coastal or food-industry structure?
316L (1.4404) for coastal, marine and food work thanks to its molybdenum content, and duplex 2205 (1.4462) where high strength is also needed. For welded structures a low-carbon grade avoids sensitisation.
Do sections come with a material certificate?
Yes. A 3.1 inspection certificate to EN 10204 is supplied on request, giving the cast analysis and mechanical properties for traceability, with no minimum order quantity on stocked SKUs.
Do you supply a polished finish for architectural work?
Yes. Sections are supplied in mill / 1D for hidden framing, and in brushed satin or polished finishes for visible architectural work, so they match the surrounding sheet and tube.
What fasteners should I use to bolt a stainless frame?
Match the fastener to the section grade: A2 (304) for inland and general frames, A4 (316) for coastal, marine and chemical structures, per ISO 3506. Keep carbon steel fasteners out of a stainless frame, and use an isolating washer where stainless meets carbon steel to break the galvanic path.