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China ERW Steel Pipe Factory - Trusted Suppliers for High-Quality Electric Resistance Welding Pipes
ERW pipe (Electric Resistance Welding pipe) is a pipe product that realizes continuous welding of metal strips through resistance heat effect. The core technology employs Joule's law (Q=I²Rt), where high-frequency current generates instantaneous high temperatures (1200–1400°C) at metal interfaces through contact resistance under electrode pressure. This induces a thermoplastic state, enabling metallurgical bonding via extrusion rollers.
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Core Technology: High-frequency resistance welding using Joule's Law — achieving precise metallurgical bonding without filler materials, ensuring superior weld integrity and mechanical performance.
📋 ERW Pipe Technical Specifications
| Parameter | Details |
|---|---|
| Standards | API 5L API 5CT ASTM A53 ASTM A179 ASTM A500 ASTM A252 BS1387 AS1163 JIS3444 EN 10217 EN10219 EN10255 GOST 3262 UL/FM GB/T 9711-2023 GB/T3091 SY/T 5038 ISO3183 EN10210 GOST10704 GOST 20295 |
| Steel Grade |
API 5L: PSL1/PSL2 — Gr.A, Gr.B, X42, X46, X52, X56, X60, X65, X70, X80 ASTM: GR.A–C, GR.1–3 EN: S235JR, S275J0H, S355JRH, S355J2H AS1163: C250, C350, C450 GOST: St2kp, St3kp |
| Outer Diameter (OD) | 21.3mm – 660mm (½" – 26") |
| Wall Thickness (WT) |
1.5mm – 22.2mm SCH10 SCH20 SCH30 STD SCH40 SCH60 XS SCH80 SCH100 SCH120 SCH140 SCH160 XXS |
| Length | 5.8m, 6m, 11.8m, 12m, or customized (SRL / DRL) |
| Pipe Ends | Plain End (PE), Beveled End (BE), Threaded End (NPT, BSP) — with or without couplings |
| Surface Treatment | Black Painting, Varnish, Anti-rust Oil, Hot-dip Galvanized, 3PE, FBE, Epoxy Coating, etc. |
| Inspection | Chemical Component Analysis, Mechanical Properties (Tensile, Yield, Elongation), Metallographic Test, Hydrostatic Test, NDT (Eddy Current, Ultrasonic), etc. |
❓ Frequently Asked Questions
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What is ERW pipe and how is it manufactured?
ERW (Electric Resistance Welding) pipe is produced by continuously forming flat steel strip into a tubular shape and welding the seam using high-frequency electrical resistance heat. Based on Joule's Law (Q=I²Rt), the process generates temperatures of 1200–1400°C at the weld interface, creating a strong metallurgical bond without filler materials.
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What international standards does your ERW pipe comply with?
Our ERW pipes comply with a wide range of international standards including API 5L, API 5CT, ASTM A53, ASTM A500, ASTM A252, EN 10217, EN10219, BS1387, JIS3444, AS1163, GOST 3262, ISO3183, GB/T 9711-2023, and more. UL/FM approved options are also available.
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What size range is available for ERW pipes?
ERW pipes are available in outer diameters ranging from 21.3mm to 660mm (½" to 26"), with wall thicknesses from 1.5mm to 22.2mm covering schedules from SCH10 to XXS. Standard lengths include 5.8m, 6m, 11.8m, and 12m, with custom lengths available upon request.
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What surface treatment options are available for ERW pipes?
We offer multiple surface treatment options to suit different environmental and application requirements, including black painting, varnish, anti-rust oil, hot-dip galvanizing, 3PE coating, FBE (Fusion Bonded Epoxy) coating, and epoxy coating.
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What quality inspections are performed on ERW pipes?
Each batch of ERW pipes undergoes rigorous quality testing, including chemical component analysis, mechanical property tests (tensile strength, yield strength, elongation), metallographic examination, hydrostatic pressure testing, and non-destructive testing (NDT) such as eddy current and ultrasonic inspection.
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What are the common applications of ERW steel pipes?
ERW steel pipes are widely used in oil and gas transportation, water supply systems, structural and construction applications, piling, mechanical and automotive manufacturing, fire protection systems (UL/FM), and general fluid conveyance across industries worldwide.