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China ERW Steel Pipe Factory - Quality Suppliers for API 5L and ASTM A53 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.
OD: 21.3mm – 660mm
WT: 1.5mm – 22.2mm
Multi-Standard Certified
Customized Length Available
Multiple Surface Treatments
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 approved, GB/T 9711-2023, GB/T3091, SY/T 5038, ASTM A500, ISO3183, EN10210, AS1163, 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. The process applies Joule's law (Q=I²Rt), generating temperatures of 1200–1400°C at the weld interface, creating a strong metallurgical bond without filler material.
Q
What international standards does ERW pipe comply with?
ERW pipes are manufactured to a wide range of international standards including API 5L, API 5CT, ASTM A53, ASTM A500, ASTM A252, EN 10217, EN10219, BS1387, JIS3444, AS1163, ISO3183, GOST 3262, GB/T 9711-2023, and UL/FM approvals, among others — making them suitable for global projects.
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 (WT) from 1.5mm to 22.2mm, covering schedules from SCH10 through XXS. Custom lengths from 5.8m to 12m or SRL/DRL are also available upon request.
Q
What surface treatment options are offered for ERW pipes?
A variety of surface treatments are available to suit different environments and applications, including black painting, varnish, anti-rust oil, hot-dip galvanizing, 3PE coating, FBE (Fusion Bonded Epoxy) coating, and epoxy coating, providing excellent corrosion protection for both above-ground and underground use.
Q
What steel grades are available for ERW pipe?
ERW pipes are available in a wide selection of steel grades: API 5L PSL1/PSL2 grades from Gr.A up to X80; ASTM grades GR.A-C and GR.1-3; European grades S235JR, S275J0H, S355JRH, S355J2H; Australian grades C250, C350, C450; and GOST grades St2kp and St3kp.
Q
What quality inspections are performed on ERW pipes?
Each ERW pipe undergoes comprehensive quality testing, including Chemical Component Analysis, Mechanical Properties testing (Tensile Strength, Yield Strength, Elongation), Metallographic Testing, Hydrostatic Pressure Testing, and Non-Destructive Testing (NDT) methods such as Eddy Current and Ultrasonic inspection, ensuring full compliance with the specified standards.