ERW pipe specifications determine whether a steel pipe can meet the dimensional, mechanical, and service requirements of a construction, pipeline, or industrial project. For buyers, diameter and wall thickness are usually the first specifications to confirm, but steel grade, manufacturing standard, pipe length, end type, testing, and coating can be equally important.
In 2026, ERW steel pipe remains widely used in water transmission, construction, structural engineering, mechanical systems, and industrial applications. Understanding the available ERW pipe sizes helps engineers and procurement teams select a suitable specification before placing an order.
What Are the Main ERW Pipe Specifications?
ERW stands for Electric Resistance Welded. ERW steel pipe is produced by forming steel strip into a cylindrical shape and joining the longitudinal edges through electrical resistance heating. High-frequency welding technology is commonly used to achieve efficient production and controlled weld quality.
The main dimensions used to specify ERW pipe are outside diameter, wall thickness, and length. Depending on the application, buyers may also specify steel grade, applicable standard, pipe end configuration, dimensional tolerances, hydrostatic testing, nondestructive testing, and surface treatment.
For international purchasing, the diameter should always be confirmed as either outside diameter or nominal diameter because these terms are not interchangeable in every standard.
What ERW Pipe Sizes Does Huayang Steel Pipe Produce?
Hebei Huayang Steel Pipe Co., Ltd. manufactures high-frequency straight seam welded steel pipes with an outside diameter range of Φ48–Φ660.4 mm, wall thicknesses of 2.0–22 mm, and standard pipe lengths from 6–27 m.
Within this range, several production units are in regular operation, including sizes such as Φ48, Φ76, Φ89, Φ108, Φ114, Φ121, Φ127, Φ133, Φ140, Φ146, Φ152, Φ159, Φ165, Φ168, Φ180, Φ194, Φ203, Φ219, Φ245, Φ273, Φ299, Φ325, Φ351, Φ355, Φ377, Φ406, Φ426, Φ457, Φ480, and Φ508 mm.
These sizes cover many commonly required dimensions for construction, water transmission, structural, mechanical, and industrial projects.
ERW Pipe Size Chart
The following chart summarizes representative ERW pipe sizes manufactured within Huayang's production range. The actual wall thickness available for each diameter depends on the production line, steel grade, applicable standard, and customer specification.
| Outside Diameter | Common Wall Thickness Range | Typical Length Range | Typical Applications |
|---|---|---|---|
| Φ48 mm | 2.0–6.0 mm | 6–12 m | Structural and mechanical systems |
| Φ76 mm | 2.0–8.0 mm | 6–12 m | Construction and utility piping |
| Φ89 mm | 2.0–8.0 mm | 6–12 m | Water and industrial applications |
| Φ108 mm | 2.0–10.0 mm | 6–12 m | Water, construction and utilities |
| Φ159 mm | 3.0–12.0 mm | 6–12 m | Water and industrial pipelines |
| Φ219 mm | 4.0–14.0 mm | 6–18 m | Pipeline and infrastructure |
| Φ273 mm | 4.0–16.0 mm | 6–18 m | Water and industrial pipelines |
| Φ325 mm | 5.0–18.0 mm | 6–18 m | Infrastructure and pipeline systems |
| Φ406 mm | 6.0–20.0 mm | 6–18 m | Water transmission and industrial projects |
| Φ508 mm | 6.0–22.0 mm | 6–27 m | Large pipeline and infrastructure |
| Φ660.4 mm | 8.0–22.0 mm | 6–27 m | Large-diameter industrial applications |
The wall thickness ranges in this table are representative rather than a fixed combination for every diameter. Final availability should be confirmed against the production line and applicable standard.
How Does Wall Thickness Affect ERW Pipe Selection?
Wall thickness is more than a dimensional parameter. It directly affects the pipe's weight, mechanical performance, pressure capability, stiffness, and suitability for different installation conditions.
For example, a pipe used in a structural application may require a different wall thickness from one designed for pressure service. Buried water pipelines may also require consideration of external loads, internal pressure, soil conditions, and corrosion allowance.
Huayang's ERW production range covers 2.0–22 mm in wall thickness, allowing buyers to select different combinations of diameter and thickness according to project requirements. The final specification should always be determined by the engineering design and relevant product standard.
Outside Diameter and Wall Thickness
Outside diameter and wall thickness should be specified together when requesting a quotation. A request such as Φ219 × 8 mm ERW steel pipe provides considerably more useful information than simply stating "219 mm steel pipe."
For international projects, buyers should also indicate whether the required dimension is based on an ASTM, API, EN, GB/T, GOST, or another applicable standard. Different standards can define dimensional tolerances and acceptable product configurations differently.
What ERW Pipe Lengths Are Available?
Pipe length is another important purchasing parameter. Huayang can produce high-frequency straight seam welded steel pipes in lengths of approximately 6–27 m.
Longer pipe lengths can reduce the number of field joints in some applications, potentially improving installation efficiency. However, transportation restrictions, lifting equipment, project design, and site conditions also need to be considered.
For export projects, buyers should therefore balance the requested pipe length with container, vessel, truck, or project-site transportation requirements.
Which Standards Can Be Applied to ERW Pipe?
The appropriate manufacturing standard depends on the intended application. ERW steel pipe may be manufactured according to standards such as API 5L, ASTM, EN, GB/T, and GOST, subject to the specific product and project requirements.
For example, pipeline projects may specify API 5L, while structural or mechanical applications can involve different ASTM, EN, or other standards. The standard determines requirements relating to chemical composition, mechanical properties, dimensions, tolerances, welding, testing, marking, and documentation.
Therefore, buyers should identify the application and applicable standard before confirming the pipe specification.
How Should Buyers Order ERW Steel Pipe?
A complete ERW pipe inquiry should normally include the required outside diameter, wall thickness, length, steel grade, standard, quantity, pipe ends, testing requirements, and coating or surface treatment.
For example, an international buyer might specify a requirement such as ERW steel pipe, Φ508 × 12.7 mm, API 5L Grade B, PSL1, 12 m length, together with the required quantity and inspection requirements. This allows the manufacturer to evaluate production feasibility and prepare an accurate quotation.
For projects requiring anti-corrosion protection, buyers should also provide the coating system, such as 3PE, 2PE, FBE, 3PP, or internal epoxy, together with the applicable coating specification.
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