Modern high-frequency ERW is a controlled process: the seam is forged by pressure and current, heat-treated, and tested, producing pipe with consistent wall and diameter at a cost per metre that seamless cannot approach in the sizes where both exist. For water transmission, gas distribution, fire lines, structural hollow sections and general process utilities, ERW is not the cheap substitute — it is the correct engineering choice.
The catalogue execution states the envelope plainly: carbon steel ERW pipe, sizes 1/2 inch to 48 inch, wall thickness Schedule 20 through Schedule 160 and XXS, grades ASTM A53 and API 5L X42, X52 and X60, and the DIN carbon grades St37, St44 and St52 — a range that covers both ASME- and DIN-specified projects. (ASTM A106 is a seamless-only specification and sits on the seamless page, not here.)
| Item | Range / Options |
|---|---|
| Standards | ASTM A53, API 5L; dimensions ASME B36.10; DIN grades listed |
| Grades | A53; API 5L X42 / X52 / X60; St37 / St44 / St52 |
| Size range | NPS 1/2 - 48 |
| Wall thickness | Schedule 20 through Schedule 160 and XXS (per the catalogue listing) |
| Ends | End finish confirmed per product at enquiry |
| Finish | Black; hot-dip galvanised executions listed |
Where ERW Belongs
Water and wastewater transmission, oil and gas gathering and distribution at rated pressures, fire protection, compressed air, structural and piling work, and general plant utilities. Where the piping code applies a weld joint factor, the design already accounts for the seam — ERW is specified in full knowledge of what it is.
Where It Does Not
Boiler and superheater duty, severe cyclic high-temperature service, and specifications that name seamless outright belong to seamless pipe. The seamless vs ERW guide sets out the decision by service, size and standard.
Supplied With Its Fittings
ERW pipe takes the same ASME B16.9 fittings and B16.5 flanges as seamless of the same size and schedule. Put them on the same enquiry and each item — pipe, elbows, tees, flanges — has its grade and schedule assessed and confirmed for the specific product before order; the line is then quoted and packed as one package.
Frequently Asked Questions
Is ERW pipe pressure rated the same as seamless?
The pipe dimensions are the same; the design codes may apply a weld joint efficiency factor to welded pipe depending on the code and the testing performed. Your design code decides the rating.
Can ERW pipe be galvanised?
Yes — hot-dip galvanised ERW executions are part of the listed range, commonly for water, fire and outdoor structural service. State galvanising on the enquiry.
What grades should I order for a DIN-specified project?
The St37 / St44 / St52 carbon grades are listed alongside the ASTM and API grades for exactly that case. Give the DIN grade and the size / wall in millimetres and the pipe will be quoted to that system.
How is ERW pipe tested before delivery?
The governing specification sets the test regime for the grade and size ordered: hydrostatic testing or non-destructive electromagnetic / ultrasonic examination of the weld seam, with flattening and bend tests on samples, as the specification's conditions require. State the standard and any test requirements on the enquiry so the test scope for your order is confirmed at quotation.
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Send Your Specification
Tell us the size, schedule or pressure class, material grade and quantity for the ERW steel pipe you need. MOQ and lead time are confirmed in the quotation for your exact specification.