What is Galvanized rectangular tube?
Galvanized rectangular tube is the rectangular twin of our pre-galvanized square range: DX51D+Z275 strip from EN 10346, slit, roll-formed to a rectangle and HF-welded, with the seam zinc-repaired in line, in 20×30 to 50×100 mm and 1.35–3 mm walls. The zinc (about 20 µm per side) protects for 10–15 years in a temperate outdoor climate without paint, and the smooth, spangle-free surface takes powder coating after a simple degrease. Because the rectangle gives depth in one direction, it is the rail and beam member of the same light outdoor frames the square tube provides the posts for — gate rails, greenhouse purlins, rack beams, pergola members, sign frames. For structural or long-life use we supply black S235JRH/S355J2H rectangular tube hot-dip galvanized after fabrication to EN ISO 1461 instead.
Galvanized rectangular tube sizes and weight per metre
Our pre-galvanized mill list (square and rectangular sizes); kg/m includes the Z275 coating.
| Size (mm) | Wall (mm) | kg/m | kg per 6 m bar |
|---|---|---|---|
| 20 × 20 | 1.35 | 0.83 | 4.96 |
| 20 × 20 | 1.8 | 1.07 | 6.44 |
| 20 × 20 | 2.5 | 1.47 | 8.83 |
| 20 × 30 | 1.4 | 1.07 | 6.4 |
| 20 × 30 | 1.5 | 1.14 | 6.85 |
| 20 × 30 | 1.8 | 1.37 | 8.22 |
| 20 × 30 | 2 | 1.51 | 9.04 |
| 20 × 30 | 2.5 | 1.87 | 11.19 |
| 20 × 40 | 1.2 | 1.11 | 6.67 |
| 20 × 40 | 1.35 | 1.25 | 7.5 |
| 20 × 40 | 1.5 | 1.38 | 8.27 |
| 20 × 40 | 1.8 | 1.64 | 9.83 |
| 20 × 40 | 2 | 1.82 | 10.93 |
| 20 × 40 | 2.5 | 2.26 | 13.54 |
| 25 × 25 | 1.4 | 1.07 | 6.4 |
| 25 × 40 | 1.4 | 1.4 | 8.37 |
| 30 × 30 | 1.2 | 1.11 | 6.67 |
| 30 × 30 | 1.35 | 1.24 | 7.44 |
| 30 × 30 | 1.5 | 1.38 | 8.27 |
| 30 × 30 | 1.8 | 1.64 | 9.83 |
| 30 × 30 | 2 | 1.82 | 10.93 |
| 30 × 30 | 2.5 | 2.26 | 13.54 |
| 30 × 40 | 1.2 | 1.3 | 7.8 |
| 30 × 40 | 1.35 | 1.45 | 8.71 |
| 30 × 40 | 1.5 | 1.61 | 9.68 |
| 30 × 40 | 1.8 | 1.92 | 11.53 |
| 30 × 40 | 2 | 2.14 | 12.81 |
| 30 × 40 | 3 | 3.18 | 19.08 |
| 30 × 50 | 1.2 | 1.49 | 8.93 |
| 30 × 50 | 1.35 | 1.66 | 9.98 |
| 30 × 50 | 1.5 | 1.85 | 11.09 |
| 30 × 50 | 1.8 | 2.21 | 13.23 |
| 30 × 50 | 2 | 2.45 | 14.7 |
| 30 × 50 | 2.5 | 3.04 | 18.25 |
| 30 × 60 | 1.2 | 1.67 | 10 |
| 30 × 60 | 2 | 2.76 | 16.58 |
| 40 × 40 | 1.2 | 1.49 | 8.93 |
| 40 × 40 | 1.35 | 1.66 | 9.98 |
| 40 × 40 | 1.5 | 1.85 | 11.09 |
| 40 × 40 | 1.8 | 2.21 | 13.23 |
| 40 × 40 | 2 | 2.45 | 14.7 |
| 40 × 40 | 2.5 | 3.04 | 18.25 |
| 40 × 40 | 3 | 3.63 | 21.76 |
| 40 × 50 | 2 | 2.76 | 16.58 |
| 40 × 50 | 2.5 | 3.44 | 20.61 |
| 40 × 50 | 3 | 4.07 | 24.44 |
| 40 × 60 | 1.2 | 1.87 | 11.19 |
| 40 × 60 | 1.35 | 2.09 | 12.53 |
| 40 × 60 | 1.5 | 2.32 | 13.92 |
| 40 × 60 | 1.8 | 2.77 | 16.62 |
| 40 × 60 | 2 | 3.08 | 18.46 |
| 40 × 60 | 2.5 | 3.83 | 22.96 |
| 40 × 60 | 3 | 4.57 | 27.41 |
| 40 × 80 | 1.4 | 2.61 | 15.63 |
| 40 × 80 | 1.8 | 3.34 | 20.01 |
| 40 × 80 | 2 | 3.71 | 22.23 |
| 40 × 80 | 2.5 | 4.61 | 27.67 |
| 40 × 80 | 3 | 5.49 | 32.92 |
| 50 × 50 | 1.2 | 1.87 | 11.19 |
| 50 × 50 | 1.35 | 2.09 | 12.53 |
| 50 × 50 | 1.5 | 2.32 | 13.92 |
| 50 × 50 | 1.8 | 2.77 | 16.62 |
| 50 × 50 | 2 | 3.08 | 18.46 |
| 50 × 50 | 2.5 | 3.83 | 22.96 |
| 50 × 50 | 3 | 4.57 | 27.41 |
| 50 × 100 | 2.5 | 5.61 | 33.68 |
| 50 × 100 | 3 | 6.67 | 39.99 |
| 60 × 60 | 1.2 | 2.23 | 13.4 |
| 60 × 60 | 1.35 | 2.51 | 15.07 |
| 60 × 60 | 1.5 | 2.79 | 16.74 |
| 60 × 60 | 1.8 | 3.33 | 20 |
| 60 × 60 | 2 | 3.69 | 22.14 |
| 60 × 60 | 2.5 | 4.61 | 27.67 |
| 60 × 60 | 3 | 5.51 | 33.06 |
| 80 × 80 | 2.5 | 6.01 | 36.03 |
| 80 × 80 | 3 | 7.14 | 42.81 |
| 100 × 100 | 3 | 9.07 | 54.4 |
Roll-formed from DX51D+Z275 strip in our Dilovası tube mill; 6 m lengths.
Grades, standards and tolerances
| Grade / standard | Yield (MPa) | Note |
|---|---|---|
| DX51D+Z275 (pre-galvanized strip) | ≈ 280 (typ.) | standard bending grade |
| S250GD / S280GD+Z275 | ≥ 250 / 280 | structural pre-galvanized on request |
| S235JRH + HDG EN ISO 1461 | ≥ 235 | post-galvanized black tube |
| S355J2H + HDG | ≥ 355 | structural, post-galvanized |
EN 10219 dimensions and tolerances; Z275 ≈ 20 µm per side; seam zinc-repaired in-line.
Lengths and stock
Length 6 m (+50/−0); cut lengths ±3 mm. Stock: 20×30, 20×40, 30×40, 30×50, 40×60, 40×80 in 1.35–2 mm; 50×100 in 2–3 mm within a week. Tolerances EN 10219-2; coating per EN 10346.
Cutting, welding and coating
As for galvanized square tube: cut ends and welds are zinc-sprayed, fume extraction when welding, powder coating after degreasing. For structural or long-life outdoor use, order black RHS and hot-dip galvanize after fabrication.
Where it is used
- Gate and fence rails, stiles and frames
- Greenhouse purlins and side rails
- Rack beams, shelving and display frames
- Trailer and pick-up body superstructures (light)
- Canopy and pergola members
- Sign and advertising frames
Pre-galvanized vs black rectangular tube
Black rectangular hollow section is the choice for anything structural, welded heavily or galvanized afterwards; pre-galvanized RHS saves the coating step for light outdoor frames. Square sizes: galvanized square tube.
Price
Priced with the galvanized square tube per ton (about 100 USD/t over black); HDG after fabrication quoted per ton. Bands below.
Bands from our weekly export list (September 2026), FOB Istanbul, full-container quantities, excluding freight and certificates. Firm price per project on RFQ within one working day.
Export and packing
We ship Galvanized rectangular tube in strapped bundles of 0.8–2 t, one size and length per bundle, tagged at both ends and — for coated sections — paper-wrapped against rub marks. Loading is 24–25 t of 6 m bars per 40' HC, 20 t per 20', and flat-rack for 12 m. HS code 7306.61.
| Term | Detail |
|---|---|
| MOQ | 5 t (mixed sizes accepted) |
| Incoterms | FOB Istanbul · CIF / CFR Gulf, Africa · DAP EU, Balkans, Iraq, Caucasus · DAP Aktau |
| Lead time | Stock 20×30–40×80: 2–5 working days; others 5–10 days; HDG +7 days |
| Packing | Bundles 0.8–1.5 t, strapped with paper separators |
| Container / truck | 40' HC ≈ 24–25 t of 6 m |
| Documents | Invoice, packing list, EN 10204 3.1, CE DoP (EN 10219-1), certificate of origin; SASO / SONCAP / PVoC on request |
| Payment | 30% advance, balance against B/L copy; L/C at sight above 100 t |
Certificates
Documentation for Galvanized rectangular tube is the strip mill certificate to EN 10204 3.1 together with our production record: size, wall, straightness and weld test. CE marking under EN 10219-1 and 3.2 witnessing are available per lot.
How to order
Send size × wall × length, quantity, coating (pre-galvanized or HDG), processing and use.
Standards
- EN 10219-1/2 — dimensions
- EN 10346 — DX51D+Z275 strip
- EN ISO 1461 — HDG after fabrication (option)
- EN 10204 3.1
Grades
Grade data sheets (chemistry, mechanicals, equivalents) are on our reference site: DX51D · S235JRH · S250GD
Frequently asked questions
What sizes of galvanized rectangular tube are available?
20×30 to 50×100 mm in 1.35–3 mm walls pre-galvanized from our mill; larger sizes as black tube hot-dip galvanized after cutting.
Is pre-galvanized rectangular tube suitable for structures?
For light frames yes; for load-bearing structures order S235JRH/S355J2H black tube and hot-dip galvanize it after fabrication (EN ISO 1461).
How much does 30×50×1.5 galvanized tube weigh?
About 1.8 kg/m including zinc — 10.8 kg per 6 m bar (see the table).