China ERW Pipe Factory - Quality Electric Resistance Welding Steel Pipe Suppliers
Detailed Description
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.
Technical Note: Joule's law (Q=I²Rt) drives the high-frequency welding process, generating temperatures up to 1400°C to achieve robust metallurgical bonding without filler metals.
| 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 (1/2" - 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 (FAQ)
ERW (Electric Resistance Welding) pipe is manufactured by cold-forming steel strips into a cylindrical shape. The longitudinal seam is then welded using high-frequency electric resistance heating under pressure, without using any filler metals.
Our ERW pipes comply with major international standards including API 5L, API 5CT, ASTM A53, ASTM A500, EN 10217, EN 10219, AS1163, and GOST 10704, covering a wide range of industrial applications.
We supply ERW pipes with an Outer Diameter (OD) ranging from 21.3mm to 660mm (1/2" to 26") and Wall Thickness (WT) from 1.5mm to 22.2mm, with customizable lengths up to 12 meters.
To prevent corrosion, we offer surface treatments such as Black Painting, Varnishing, Anti-rust Oil, Hot-dip Galvanized, 3PE, FBE, and Epoxy Coatings depending on project requirements.
Every batch undergoes strict testing, including Chemical Component Analysis, Mechanical Properties Tests (Tensile, Yield, Elongation), Metallographic Tests, Hydrostatic Testing, and Non-Destructive Testing (NDT) such as Eddy Current and Ultrasonic testing.