High Frequency Welded Steel Pipe (HFW Pipe)

High Frequency Welded (HFW) steel pipe is continuously roll-formed via high-frequency induction welding technology, widely used as raw tube for ringlock scaffolding, steel frame formwork, support joists and steel structural frames. Manufactured from Q235 & Q355B low-alloy high-strength steel strips, its integrated forged weld delivers uniform wall thickness and superior roundness accuracy. Available in black finish or hot-dip galvanized anti-corrosion treatment. Standardized sizes perfectly match all formwork shoring and scaffolding systems, supplying stable raw material support for full construction formwork solutions.

Parameter	Details
Production Process	High-frequency induction continuous welding, online weld ultrasonic inspection
Material Grade	Q235, Q355B low alloy high strength steel
Common Outer Diameter	Ø42mm, Ø48mm, Ø60mm (standard scaffolding & formwork size)
Wall Thickness Range	2.0mm / 2.75mm / 3.0mm / 3.25mm / 3.5mm
Standard Length	6m fixed length, custom cut-to-length available
Dimensional Tolerance	OD tolerance ±0.2mm, wall thickness tolerance ±0.1mm
Surface Treatment	Black oiled finish / Hot-dip galvanized
Executive Standard	EN 10219, GB/T 3091
Testing Item	Weld UT inspection, flattening test, bending test, tensile test

• High weld integrity: High-frequency extrusion fusion without filler metal; weld mechanical performance consistent with base steel, crack-resistant and stable under heavy load.
• Precise dimension consistency: Continuous strip forming ensures even wall thickness and perfect roundness for tight fit with ringlock discs, clamps and sleeves.
• Outstanding cost performance: Fully automatic mass production with short lead time, much lower unit cost than seamless steel pipes for mass scaffolding & formwork production.
• Custom anti-corrosion option: Full internal & external hot-dip galvanization available for long-term outdoor turnover and extended service life of finished scaffolding and formwork.
• Wide processing compatibility: Supports cutting, punching, welding and threading for manufacturing standards, ledgers, braces, back ribs, jack bases and U-heads.

Raw tube for all ringlock scaffolding components; frame, stiffener and back rib fabrication of steel frame formwork; formwork shoring for buildings and bridges; factory steel structures, guardrails and working platforms; temporary support frames for utility tunnels and water conservancy projects.