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China ERW Pipe Suppliers - High-Quality Electric Resistance Welding Pipe from Factory
⚡ 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 (1,200–1,400°C) at metal interfaces through contact resistance under electrode pressure. This induces a thermoplastic state, enabling metallurgical bonding via extrusion rollers.
📋 ERW Pipe 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
Q
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 1,200–1,400°C at the weld interface, creating a solid metallurgical bond without filler material.
Q
What standards does your ERW pipe comply with?
Our ERW pipes are manufactured in compliance 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 products are also available upon request.
Q
What size range is available for ERW pipes?
ERW pipes are available in outer diameters ranging from 21.3mm (½") to 660mm (26"), with wall thicknesses from 1.5mm to 22.2mm, covering schedules from SCH10 to XXS. Custom lengths (SRL/DRL) are also offered in addition to standard lengths of 5.8m, 6m, 11.8m, and 12m.
Q
What surface treatment options are available?
We offer multiple surface treatment options to meet different application and environmental requirements, including black painting, varnish, anti-rust oil, hot-dip galvanizing, 3PE coating, FBE (Fusion Bonded Epoxy) coating, and epoxy coating. Custom coatings can be arranged based on project specifications.
Q
What quality inspections are performed on ERW pipes?
Each batch of ERW pipe undergoes rigorous quality control, including chemical component analysis, mechanical property testing (tensile strength, yield strength, elongation), metallographic examination, hydrostatic pressure testing, and non-destructive testing (NDT) such as eddy current and ultrasonic inspection.
Q
What are the common applications of ERW steel pipes?
ERW steel pipes are widely used in oil and gas transmission pipelines, structural and construction applications, water supply systems, piling, mechanical engineering, and fluid transportation. Their versatility across multiple grades and coatings makes them suitable for both onshore and offshore environments.