High-Frequency ERW Steel Pipes
for Energy, Structure & Industry
Manufactured from hot-rolled steel strip using high-frequency electric resistance welding (HFW). The process includes uncoiling, edge milling, forming, and longitudinal welding under precise electrode pressure. High-frequency current generates 1200–1400 °C heat at the seam, achieving full penetration and strong metallurgical bonding. ERW pipes ensure tight tolerance, smooth welds, and cost efficiency — ideal for oil, gas, water, and structural projects.
Formed from precisely leveled and edge-milled steel strip, ensuring smooth surface and tight dimensional tolerance.
High-frequency electric resistance welding (HFW) generates 1200–1400 °C heat for full-penetration seam fusion and strong bonding.
Each pipe is tested by 100% online eddy current & ultrasonic inspection, followed by hydrostatic and dimensional verification.
Available coatings: black varnish, galvanized (GI), fusion-bonded epoxy (FBE), and 3LPE / 3LPP systems according to project specs.
ERW STEEL PIPE — High-Frequency Welded (HFW)
ERW (Electric Resistance Welding) steel pipe is produced through a high-frequency welding process using hot-rolled steel strip as raw material. The manufacturing steps include uncoiling, leveling, cutting and joining strips, loop storage, forming, high-frequency welding, removal of internal and external burrs, sizing, non-destructive testing, flying cutting, inspection, and packaging. The result is a pipe with smooth welds, high dimensional accuracy, and excellent mechanical strength — widely used in oil & gas, water transmission, construction, and structural applications.
- High-frequency welding (HFW) ensures precise heat control and full-penetration joints.
- Online eddy-current and ultrasonic testing verify weld integrity and uniform wall thickness.
- Manufactured in various steel grades (Gr.B, X42–X80, L245–L555, S235–S355, C250–C450) to suit diverse projects.
Description
ERW (Electric Resistance Welded) steel pipe is manufactured from hot-rolled steel strip using a high-frequency welding process. The principle relies on Joule heating (Q = I²Rt), where high-frequency current induces instant localized temperatures of approximately 1200–1400 °C at the strip edges under electrode pressure. This thermoplastic state enables metallurgical bonding through extrusion by squeeze rollers, producing a continuous, uniform weld without filler metal.
The production line typically includes uncoiling, leveling, edge trimming, strip joining, accumulator storage, forming, high-frequency induction welding, removal of internal and external burrs, sizing, straightening, non-destructive testing, flying cutting, and final inspection and packaging. ERW pipes feature smooth seams, precise geometry, and consistent mechanical strength — ideal for applications in oil & gas transmission, water systems, structural construction, and industrial pipelines.
- High-frequency induction welding (HFW) achieves full-penetration seams with minimal heat-affected zones.
- 100% online non-destructive testing (eddy current / ultrasonic) ensures weld integrity and dimensional consistency.
- Available in multiple standards and grades for fluid, structural, and mechanical service pipelines.
- Optional surface coatings including FBE, 3LPE, 3LPP, and galvanizing for long-term corrosion protection.
| Product Name | ERW Steel Pipe · HFW Steel Pipe · Electric Resistance Welded Pipe |
|---|---|
| Outer Diameter | 21.3 mm – 660 mm (½″ – 26″) |
| Wall Thickness | 1.5 mm – 22.2 mm (0.06″ – 0.87″) |
| Length | 6 m / 12 m / 18 m (customizable) |
| Ends | Plain ends · Bevelled ends (30° ± 5°) · Flanged ends |
| Surface Treatment | Bare · Black Varnish · Galvanized (GI) · FBE · 3LPE · 3LPP |
| Standard | Steel Grade |
|---|---|
| API 5L | PSL1/PSL2 · Gr.A, Gr.B, X42 – X80 |
| API 5CT | J55, K55, N80, L80 (For Casing & Tubing) |
| ASTM A53 / A179 / A500 / A252 | Gr.A, Gr.B, Gr.C |
| EN 10217 / EN 10219 / EN 10255 | S275JR, S275J0H, S355JRH, S355J2H |
| AS/NZS 1163 | C250, C350, C450 |
| GOST 3262 | St2kp, St3kp |
| BS 1387 / UL / FM | For Fire-Fighting & Water Distribution Systems |
Specifications Sheet
Main Applications
ERW (High-Frequency Welded) steel pipes are widely used in energy, water, and construction sectors — providing precise dimensional control, smooth welds, and reliable performance for medium-pressure transmission and structural systems.
Oil & Gas Transmission
Applied in gathering lines, casing protection, and distribution networks for low to medium pressure oil and gas transport, offering strong weld integrity and consistent quality.
Water Supply Systems
Used in potable water delivery, irrigation lines, and municipal pipelines requiring clean internal surfaces and precise sizing for smooth flow efficiency.
Construction & Structural
Extensively used in steel structures, columns, scaffolding, and general fabrication thanks to accurate dimensions and good weld toughness.
Mechanical & Industrial
Ideal for automotive, furniture, machinery frames, and other industrial tubing applications requiring consistent wall thickness and formability.
Fire Protection & Infrastructure
Used for fire sprinkler lines, air-conditioning ducts, and public utility conduits where UL/FM certified ERW pipes ensure safety and reliability.
Advantages
- Precision Manufacturing: High-frequency welding (HFW) guarantees smooth seams, tight tolerance, and minimal heat-affected zones.
- High Efficiency: Continuous coil feed and automated inspection allow rapid, large-scale production with uniform quality.
- Cost-Effective: Lower material waste and reduced welding consumables compared with seamless pipes.
- Strong Mechanical Properties: Excellent tensile strength, impact resistance, and pressure performance meeting API & EN standards.
- Versatile Standards: Conforms to API 5L, ASTM A53, EN 10219, AS/NZS 1163, and other international specifications.
- Surface Options: Available in black varnish, galvanized (GI), FBE, or 3LPE / 3LPP coatings for extended corrosion protection.
Packing & Transportation
ERW pipes are straight and uniform in length, typically bundled with steel straps and sealed with plastic end caps. Depending on project volume and transport route, multiple logistics solutions are adopted:
- Container Shipping: Suitable for smaller diameters and 6–12 m lengths, ensuring safe and convenient loading.
- Bulk Vessel: Used for large-volume exports; pipes stacked on dunnage with anti-deformation support and protective wrapping.
- Flat Rack / Frame Transport: Recommended for oversized or coated pipes to maintain straightness and surface integrity during handling.
