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China ERW Steel Pipe Factory: Quality Electric Resistance Welding Pipes from Reliable Suppliers
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.
📋 Product 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 Approved 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 forming a flat steel strip into a tubular shape and welding the seam using high-frequency electrical current. Based on Joule's law (Q=I²Rt), the process generates temperatures of 1200–1400°C at the weld interface, creating a solid metallurgical bond without the need for filler material.
Q
What size range is available for ERW pipes?
ERW pipes are available with an outer diameter (OD) ranging from 21.3mm to 660mm (½" to 26") and wall thickness from 1.5mm to 22.2mm, covering schedule designations from SCH10 to XXS.
Q
Which international standards do your ERW pipes 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, AS1163, JIS3444, GOST 3262, ISO3183, GB/T 9711-2023, and more. UL/FM approved grades are also available.
Q
What surface treatment options are offered for ERW pipes?
We offer multiple surface treatment options to meet 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.
Q
What quality inspections are performed on ERW pipes?
Each pipe undergoes rigorous quality control including chemical component analysis, mechanical property testing (tensile, yield strength, elongation), metallographic examination, hydrostatic pressure testing, and non-destructive testing (NDT) such as eddy current and ultrasonic inspection.
Q
Can ERW pipes be customized in terms of length and pipe ends?
Yes. Standard lengths of 5.8m, 6m, 11.8m, and 12m are available, as well as customized lengths in SRL or DRL configurations. Pipe ends can be supplied as Plain End (PE), Beveled End (BE), or Threaded End (NPT/BSP), with or without couplings, based on project requirements.