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Galvanized Steel Pipe ERW Round Seamless
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Galvanized Steel Pipe (GI Pipe) – ERW & Seamless

Round galvanized steel pipe for water lines, scaffolding, fencing, greenhouses and building structures. Supplied hot-dip galvanized (HDG) or pre-galvanized, to BS 1387, ASTM A53, EN 10255 or EN 10219, with plain, bevelled, threaded or grooved ends.

ProductGalvanized round steel pipe (ERW / seamless)
StandardsBS 1387, EN 10255, ASTM A53, EN 10219, ASTM A500, GB/T 3091
Steel gradeQ195, Q235, Q345, S235JRH, S355J2H, A53 Gr.A / Gr.B
Outside diameter21.3 – 219 mm (½" – 8")
Wall thickness0.8 – 20 mm (Light / Medium / Heavy, SCH40, SCH80)
Zinc coatingHDG 300–550 g/m²; pre-galvanized Z60–Z275
Length5.8 m, 6 m, 6.4 m, 12 m or to order
EndsPlain, bevelled, threaded + socket, grooved
CertificatesMill test certificate EN 10204 3.1; SNI / SONCAP / SASO support on request
MOQ1 ton per size
Payment30% T/T deposit, 70% against B/L copy; L/C at sight
Loading portTianjin / Qingdao
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Hot-dip galvanized vs pre-galvanized pipe

Most buyers choose between two products that look similar on the quotation but behave very differently on site:

  • Hot-dip galvanized (HDG) pipe – the finished black ERW pipe is dipped in molten zinc, so the inside, the outside and the weld seam are all coated. Typical coating is 300–550 g/m² (roughly 45–75 µm). This is the right choice for potable and fire-water lines, outdoor structures and humid or coastal climates.
  • Pre-galvanized pipe – the pipe is formed from zinc-coated strip (Z60–Z275), and only the weld line is re-sprayed with zinc. It is cheaper and has a smoother, brighter surface, but the coating is thinner. It suits furniture, greenhouse frames, fencing and indoor or dry-climate use.

If your project documents only say "GI pipe", ask the consultant which one is meant. For water service in Africa and the Middle East, HDG is almost always what the specification requires.

Standards we supply

StandardTypical useNotes
BS 1387 (Light / Medium / Heavy)Water & gas lines, scaffoldingStill the reference in Nigeria, Ghana, Kenya, Tanzania and the Gulf. Colour bands: Light = brown, Medium = blue, Heavy = red.
EN 10255 (L / M / H)Water & gas linesThe European replacement for BS 1387, with near-identical dimensions.
ASTM A53 Type E, Grade A / BPressure & mechanical pipingSchedule 40 and Schedule 80 wall thicknesses.
EN 10219 / ASTM A500Structural hollow sectionsColumns, trusses and frames; S235JRH / S355J2H or Grade B / C.
GB/T 3091, Q195 / Q235 / Q345General constructionChinese national standard; cost-effective for non-certified work.

Common sizes (EN 10255 / BS 1387 Medium)

Nominal sizeOD (mm)Wall – Medium (mm)
½" (DN15)21.32.6
¾" (DN20)26.92.6
1" (DN25)33.73.2
1¼" (DN32)42.43.2
1½" (DN40)48.33.2
2" (DN50)60.33.6
2½" (DN65)76.13.6
3" (DN80)88.94.0
4" (DN100)114.34.5

Larger diameters up to 219 mm, and any wall thickness between 0.8 and 20 mm, are available on request. Scaffolding tube is normally 48.3 × 3.2 / 4.0 mm to EN 39.

Ends, lengths and packing

  • Ends: plain, bevelled for welding, threaded (BSPT or NPT) with sockets, or roll-grooved for fire-sprinkler systems.
  • Length: 5.8 m and 6 m fit a 20ft container; 6.4 m and 12 m are also available.
  • Packing: hexagonal bundles tied with steel strips. Thread protectors or plastic end caps are fitted on request, and bundles can be labelled with your brand and project number.
  • Documents: mill test certificate (EN 10204 3.1); third-party inspection (SGS, BV, Intertek) can be arranged before loading.

How to get an accurate price

Galvanized pipe is priced per ton, and the price depends mainly on the steel base price, the zinc coating weight and the wall thickness. To quote quickly, we need: the standard and class (for example BS 1387 Medium), the sizes and quantity of each size, HDG or pre-galvanized, the end finish, and your destination port. We ship regularly to Lagos (Apapa), Tema, Mombasa, Dar es Salaam, Jebel Ali, Dammam, Port Klang and Manila.

Frequently asked questions

What is the difference between BS 1387 Medium and Heavy pipe?

Same outside diameter, different wall thickness. For 2 inch pipe, Medium is 3.6 mm and Heavy is 4.5 mm. Medium is the usual choice for water service; Heavy is used where the pipe is threaded deeply or buried.

Is hot-dip galvanized pipe suitable for drinking water?

Yes, HDG pipe is widely used for potable water service. Tell us if your project needs a specific coating weight or a third-party test, and we will include it in the quotation.

How many tons of galvanized pipe fit in a container?

A 20ft container usually carries 20–25 tons of 5.8–6 m pipe, depending on the size mix. 12 m pipe is shipped in 40ft containers or as break-bulk.

Can you thread the pipe and supply sockets?

Yes. We thread to BSPT or NPT and fit one coupling per pipe, with plastic caps protecting the other thread.

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