Tianjin Brisk Metalwork Co., Ltd. is one of the leading manufacturers and suppliers of s420 rectangular hollow section for load bearing structures in China. We have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy bulk durable s420 rectangular hollow section for load bearing structures from our factory.
Which S420 Route Do We Offer for Square Hollow Sections?
- S420MH (EN 10219-1): cold-formed, welded, thermomechanically rolled. Our choice for lighter, efficiently welded frames.
- S420NH (EN 10210-1): hot-finished, normalized. Our choice for members that will be hot-bent, galvanized or built into heavy nodes.
Tell us how the members are fabricated after delivery and we will match the route.
What Do We Do Differently When the Order Is Load-Bearing?
When a section carries the structure, the certificate values matter more than the label. On S420 RHS orders we:
- Test yield and tensile on the finished section for each heat and lot, not only on the incoming coil.
- Roll the wall to nominal, so the capacity in your calculation is the capacity you receive.
- Trace each bundle by heat number, so the certificate matches the steel on your site.
- State the impact-test result on the certificate at the temperature you specify.
- Issue EN 10204 3.1 as standard, with 3.2 third-party witness on request.
Why Does Higher Yield Not Always Allow a Thinner Wall in RHS?
Our engineers raise two points with buyers before an S420 RHS order is finalized:
- Stiffness stays the same. S420 and S355 have the same modulus of elasticity. In a beam or girder governed by deflection, a thinner wall gives a less stiff member, even though it is stronger.
- Wall slenderness limits get tighter. In EN 1993 the width-to-thickness limits shrink as yield rises, by roughly 8 percent for S420 compared with S355. A wall that was compact in S355 may fall into a lower cross-section class in S420.
Your structural engineer makes the final call. We can check your size list with you before you place the order.
Real Project Case: Lighter Girders, Without the Deflection Problem
A contractor planned 40 roof girders, each 12 m long, in 300 x 200 x 10 S355 RHS, about 34.9 tonnes in total. To save weight, they switched to 300 x 200 x 8 S420. The girders became about 19 percent lighter, but the stiffness of the section dropped by about 18 percent, and the deflection limit was exceeded. After our review they moved to 350 x 200 x 8 S420:
- Total steel fell to about 31.3 tonnes, roughly 3.6 tonnes saved
- Stiffness was about 19 percent higher than the original S355 section
- The deflection check passed with no change to the span
The lesson: with S420, gain stiffness from depth rather than from wall thickness.
Where Do Fabricators Use S420 RHS in Load-Bearing Structures?
- Roof girders and long-span trusses
- Transfer beams and mezzanine frames
- Portal frame rafters and columns
- Crane runway supports and lifting frames
- Heavy equipment and platform frames
How Do We Deliver Long RHS Members?
- Strapped bundles with dunnage at close intervals, so long members do not sag
- End protection on painted and galvanized sections
- Marking on every bundle with grade, size, heat and lot number
- Finishes: black, painted or hot-dip galvanized
FAQ
Q: Which face is the weld seam on, and can I request a specific face?
A: The seam sits on one of the flat faces. If a face will be exposed, tell us and we will plan the orientation when bundling.
Q: Do I get a strength report for each lot or one certificate per shipment?
A: Each certificate lists the heats and lots supplied, with test results for each.
Q: Can you support a tender with a size and weight schedule?
A: Yes. Send us your bill of materials and we will return a priced schedule with theoretical weights and lead time.
Q: Can I have my own inspector check the goods before shipment?
A: Yes. We can arrange inspection at our works by your inspector or a third-party agency.
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