Products Positioning
Industrial construction demands structural materials that deliver load stability, dimensional accuracy, and fabrication efficiency. ERW carbon steel square tube addresses these requirements through a mature manufacturing route: cold roll-forming a steel strip into tubular form, welding the edges via high-frequency electric resistance, then sizing to square section.
Key Advantages
1. Dimensional precision from cold forming
The ERW process forms steel strip at ambient temperature through a series of forming rolls, followed by welding and sizing into square profile. Cold working preserves the steel's microstructure while enabling tight dimensional tolerances-critical for bolted connections, welded joints, and purlin installation in industrial buildings.
2. Weld integrity with in-line inspection
High-frequency current fuses the strip edges under squeeze pressure. Production lines are equipped with eddy current testing systems that continuously monitor weld quality, marking and rejecting non-conforming sections. For load-bearing applications, this in-line verification is essential to consistent structural performance.
3. Material grades and size range suited to industrial applications
Common grades include Q235B, Q355B, S235JR, S355JR, and SS400, covering yield strengths from 235 MPa to 355 MPa-adequate for general industrial buildings, warehouses, and equipment support structures. Square tube sizes range from 20×20 mm to 600×600 mm, with wall thicknesses from 1.0 mm to 20 mm; custom dimensions available upon request.
4. Fabrication-friendly geometry
The flat faces and uniform section facilitate cutting, drilling, bending, and welding. Connection plates, end plates, and cleats can be directly attached to the tube surface, streamlining shop fabrication and site erection.
Applications
● Industrial building frames: columns, beams, truss members
● Racking and equipment supports: load-bearing posts, bracing
● Roof purlins: closed-section alternative to C-sections
● Temporary structures and barriers: site hoarding, machine guards
Standards
Products can be manufactured and inspected to EN 10219 (cold formed welded structural hollow sections), ASTM A500, JIS G 3466, or GB/T 6728, depending on project specification requirements.
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