S460 Circular Hollow Section For High Strength Structures

Tianjin Brisk Metalwork Co., Ltd. is one of the leading manufacturers and suppliers of s460 circular hollow section for high strength structures in China. We have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy bulk durable s460 circular hollow section for high strength structures from our factory.

Our Product

Tianjin Brisk Steel focus on produce and supply hollow section and steel pipe

We manufacture S460 circular hollow section (CHS) for struts, columns, chords, masts and space-frame members where high strength has to be turned into real load capacity. We supply two production routes from one factory:

• Hot-finished, EN 10210 S460NH / S460NLH: seamless, or welded and then normalized
• Cold-formed, EN 10219 S460MH / S460NLH: welded, thermomechanically rolled steel

S460 designates a minimum yield strength of 460 MPa (the standard lowers the guaranteed value for thicker walls). That is about 30% more than S355, which lets you cut steel weight or reduce member size on the same load.

This page explains something we see buyers miss with high-strength CHS: the production route you choose can change how much of that 460 MPa a compression member is allowed to use.

Same stiffness in every direction. A circle has no weak axis, so a strut buckles the same way whichever way it is loaded or rotated.

The most efficient shape in compression. For a given steel area, a CHS puts material far from the centre, which gives a large radius of gyration. That is why circular tubes dominate struts, bracing and column work.

Strong in torsion. Closed circular sections handle twist far better than open sections.

Lower wind and water drag. Rounded members shed flow more smoothly than flat-faced members, which matters on masts, towers and exposed roof frames.

No corners. There are no cold-worked corner zones to worry about, so properties are consistent around the whole circumference.

Simple, repeatable nodes. Tube-to-tube joints, sleeve joints and flanged joints are well established and fabricators know them.

Structural codes do not treat all hollow sections the same when they check a compression member for buckling. In EN 1993-1-1, hot-finished hollow sections in S460 are assigned a more favorable buckling curve than cold-formed hollow sections. The cold-formed route is assessed on a less favorable curve because of residual stresses from forming.

For a stocky, high-strength strut, this can mean the same OD and wall in S460 gives a noticeably higher design resistance when supplied hot-finished than when supplied cold-formed. We do not say this to push one route over the other, since we make both. We say it because we have seen buyers select S460 to save weight and then find that the buckling check did not give the saving they expected.

Our recommendation, in practice:

• Compression-critical struts, columns and braces: ask us for the hot-finished EN 10210 S460NH route
• Tension members, chords in tension and lightly loaded frames: the cold-formed EN 10219 S460MH route is usually the economical choice
• Not sure: send us your member schedule and we will tell you which route fits which members. Your engineer still makes the final design check.

For compression members these three matter more than anything else, since an out-of-round or bowed tube starts its life already carrying a built-in imperfection.

• Roundness (ovality): measured on finished tube at both ends and mid-length, and held tighter than the standard limit so sleeve joints and flanges seat properly
• Wall thickness: measured around the circumference, not only at one point, to catch eccentricity on seamless tube
• Straightness: checked on finished length. We target about 1 mm per metre or better, since a bowed strut buckles earlier
• Length: cut to your schedule with tolerance agreed at order
• Ends: saw-cut square for end-bearing or flange contact, bevelled for full-penetration welds

A steel contractor was fabricating a roof space frame with 120 compression struts, each about 4.2 m long, roughly 504 m in total. The original design used S355 CHS 219.1 x 12.5 mm at about 64 kg/m.

To reduce weight, the team wanted to keep the same 219.1 mm outside diameter (so gusset and node details stayed unchanged) but thin the wall. A supplier had quoted S460 cold-formed 219.1 x 10 mm. Their engineer's buckling check showed that section would carry only about 1.9 MN, less than the 2.4 MN of the original S355 strut.

We were asked to review. We proposed S460NH hot-finished 219.1 x 10 mm at about 52 kg/m. On the buckling curve applicable to that route, the resistance checked at about 2.5 MN, slightly above the original.

Result:

• Same OD, so no change to node or gusset geometry
• Weight down from about 64 to 52 kg/m, roughly 19% lighter
• About 6 tonnes of steel saved across 504 m of struts
• Compression capacity maintained, instead of dropping by about 20% on the cold-formed alternative

• Space frames and roof structures: stadiums, exhibition halls, airport canopies.
• Bridges: truss members, arches and pedestrian bridge frames.
• Towers and masts: telecom, lighting and transmission structures.
• Crane and lifting equipment: jibs, booms and lifting frames.
• Industrial platforms and pipe racks: heavily loaded columns and bracing.
• Offshore topside support frames and jetties: where weight and wind exposure matter (subject to the project specification).

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