Tianjin Brisk Metalwork Co., Ltd. is one of the leading manufacturers and suppliers of s420 circular hollow section for structural engineering in China. We have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy bulk durable s420 circular hollow section for structural engineering from our factory.
What Sizes and Lengths Can We Supply?
| Item | Our supply range |
|---|---|
| Outside diameter | 21.3 mm to 630 mm |
| Wall thickness | 2 mm to 40 mm (depends on OD and route) |
| Standard lengths | 6 m and 12 m, other lengths on request |
| Delivery | Black, varnished, painted or hot-dip galvanized |
| Ends | Plain, square-cut, beveled, or profile-cut for tubular joints |
Hot-finished seamless CHS is most practical up to roughly 400-450 mm OD. Above that, we recommend the welded route.
Why Do Engineers Choose a Round Section at S420?
A circular section has no weak axis. It resists bending, buckling and torsion equally in every direction, and it sheds wind and water loading better than a flat face. Combined with S420 strength, you get:
- Lower steel tonnage on compression members, because buckling capacity is the same in all planes.
- Cleaner detailing on nodes where several members meet at odd angles.
- Longer coating life, since there are no sharp edges where paint thins out.
How Do We Prepare CHS Ends for Tubular Joints?
Most CHS delays we see happen at the node, not in the tube. Brace ends must be saddle-profiled to sit on a curved chord. We offer:
- CNC profile cutting of brace ends to your drawing, including compound angles.
- Weld-prep bevels matched to the weld procedure you specify.
- Marked members, each labeled with its position number, so the fabricator's crew can assemble without measuring.
Send us the joint drawing, and we cut to it.
How Do We Keep Roundness and Wall Consistent?
CHS is dimensionally judged by ovality and wall uniformity, and both decide whether a tubular weld fits without gaps.
- In-line OD control during forming and sizing, with each production lot checked by caliper and pi-tape.
- Weld seam position control: on request, we mark the seam so it can be turned away from high-stress node zones.
- Weld seam NDT on welded product, plus tensile and impact testing by lot.
- Normalizing for the hot-finished route, with furnace records kept per heat.
What Documents Come with Every Shipment?
- EN 10204 3.1 mill certificate with heat number, chemistry, tensile and impact results
- 3.2 certificate with third-party witnessing (SGS, BV, TUV or your nominated agency)
- Dimensional inspection report, lot traceability and packing list
- Pipe end marking with grade, size, heat number and lot
Where Is Our S420 CHS Used?
Steel truss roofs, stadium canopies, pedestrian and road bridges, crane booms, offshore-type jackets and platforms, towers and masts, and heavy-duty space frames.
Case: How Did S420 Save Steel on a 48 m Roof Truss?
A structural fabricator in the Middle East was building a hall roof truss with 219.1 x 10 mm chords in S355, about 62 tonnes for the project. After the engineer re-checked buckling and node capacity at S420, the chords went to 219.1 x 8 mm and the braces stayed the same.
- Chord weight fell from about 51.6 kg/m to 41.6 kg/m, roughly 19% less.
- Total tube tonnage dropped to about 50 tonnes.
- We profile-cut all 184 brace ends in our workshop, so the fit-up on site needed almost no trimming.
- Shipping cost also fell, since the order fit into fewer containers.
The saving came from matching the grade to the design, and from cutting the ends before shipment.
Related ：S420 Structural Hollow Section
FAQ
Q: Can S420 CHS be hot-dip galvanized?
A: Yes. We can galvanize finished members, and we place vent and drain holes according to your drawing so the tube does not trap air or zinc.
Q: Can you supply a mix of sizes in one container?
A: Yes. Mixed OD and wall combinations are common for truss projects, and we load them together with labeled bundles.
Q: Can you match the seam position to my node layout?
A: Yes, for welded product we can mark the seam and keep it away from the zone you specify.
Q: Do you supply samples for a fit-up trial?
A: Yes. Contact us with your drawing and we will cut a sample brace end for you to check.
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