Tianjin Brisk Metalwork Co., Ltd. is one of the leading manufacturers and suppliers of erw structural hollow section in China. We have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy bulk durable erw structural hollow section from our factory.
Product Specifications
| Item | Specification |
|---|---|
| Shape | Square (SHS), Rectangular (RHS) |
| Size range | 20 x 20mm - 500 x 500mm |
| Wall thickness | 1.5mm - 16mm |
| Length | 6m / 12m standard, custom on request |
| Standard/Grade | EN 10219 (S235JRH, S355J0H/J2H/NH/NLH); ASTM A500 (Gr.A/B/C); AS/NZS 1163 (C250/C350/C450); JIS G3466 (STK400/STKR400/STKR490) |
| Production process | Coil-fed roll forming + high-frequency induction (ERW) welding |
| Surface finish | Black (self-colored), varnish/oil coated, hot-dip galvanized, pre-galvanized |
| Weld seam testing | Eddy-current or ultrasonic, in-line or full-length post-production |
| Certification | EN 10204 3.1 mill test certificate, heat-traceable |
Key Features
- Continuous coil-to-shape production - one coil runs through forming and welding without interruption, giving consistent wall thickness and straightness along the full length
- Weld seam formed from parent steel, not filler wire - induction heat fuses the strip edges directly, keeping seam chemistry identical to the base material
- Corner radius held to standard tolerance - typically under 2-2.5x wall thickness on cold-formed corners, confirmed by in-line dimensional checks
- Available across four major standards from one production line, so we can match whichever spec your project or region calls for without re-sourcing material
- Multiple surface finish options ready for direct structural use, further coating, or field welding
Quality Control
- Incoming coil chemistry verified against target grade before slitting
- In-line monitoring of weld current, forging pressure, and seam profile during production
- Internal/external weld bead trimmed flush immediately after welding
- Eddy-current or ultrasonic seam testing per batch or full length, depending on standard
- Batch mechanical testing (yield, tensile, elongation, bend/flatten test per standard)
- Dimensional inspection (size, wall thickness, straightness, corner radius) at set intervals
Size and Grade Availability by Standard
| Standard | Grades We Supply | Typical Use |
|---|---|---|
| EN 10219 | S235JRH, S355J0H/J2H/NH/NLH | European/Middle East structural projects |
| ASTM A500 | Gr.A, Gr.B, Gr.C | US and Americas structural projects |
| AS/NZS 1163 | C250, C350, C450 | Australia/New Zealand structural projects |
| JIS G3466 | STK400, STKR400, STKR490 | Japan/Southeast Asia structural projects |
FAQ
Q: Can you supply the same size across more than one standard on the same order?
A: Yes - the same nominal SHS/RHS size can be certified to EN 10219, A500, AS/NZS 1163, or JIS G3466 depending on which grade your project needs.
Q: What's the largest section you produce by ERW before switching to LSAW?
A: Up to roughly 500 x 500mm at up to 16mm wall; larger or thicker sections are produced from plate via LSAW.
Q: Do you supply weld-seam NDT records separately from the mill certificate?
A: Yes, on request for projects with elevated seam-quality requirements.
Q: Is galvanizing available on all standards/grades listed?
A: Yes - hot-dip and pre-galvanized finish are available across all standards shown above.
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