Tianjin Brisk Metalwork Co., Ltd. is one of the leading manufacturers and suppliers of hot finished seamless structural hollow section in China. We have world-leading production equipment and strong manufacturing capabilities. Please feel free to buy bulk durable hot finished seamless structural hollow section from our factory.
Tianjin Brisk Steel is one of the Hot Finished Seamless Structural Hollow Section in China. Our products are mainly exported to the Middle East, Southeast Asia, Europe, New Zealand, and other regions.If you would like to learn more about our products, feel free to contact us and send your purchase list.
Specifications
| Item | Specification |
|---|---|
| Standard | EN 10210-1 (technical delivery conditions), EN 10210-2 (tolerances, dimensions) |
| Production route | Seamless (hot pierced and rolled from billet) |
| Steel grade | S235JRH, S275J0H/J2H, S355J0H/J2H/K2H |
| Section shape | Circular hollow section (CHS) only |
| Outer diameter | 21.3mm – 630mm (mill-dependent) |
| Wall thickness | 2.0mm – 40mm |
| Length | 6m / 12m standard, random or fixed lengths available |
| Tolerance | Per EN 10210-2 (diameter and wall thickness tolerance tables) |
| Surface finish | Black (mill finish), hot-dip galvanized on request |
Why Choose Hot Finished Seamless Hollow Section
- No weld seam, no weld-affected zone: Eliminating the weld seam removes the single most common source of localized property variation and inspection burden found in welded hollow sections, simplifying both structural design assumptions and quality control.
- Uniform properties around the full circumference: Because the tube is formed from a solid billet rather than joined from formed strip, mechanical properties are generally more consistent all the way around the section, without the localized differences sometimes seen near a weld line.
- Strong fit for dynamic and fatigue-sensitive applications: Structures subject to cyclic loading, vibration, or torsion - offshore jacket structures, crane booms, mechanical shafting-adjacent structural members - often specify seamless CHS specifically to avoid fatigue crack initiation at a weld toe.
- Simplified fabrication NDT scope: Because there is no seam weld to separately inspect, quality control during fabrication can focus on parent material testing and any subsequent field/shop welds, rather than mill weld seam inspection.
- Long-standing use in high-integrity applications: Seamless hollow sections have a long history of use in pressure-adjacent and safety-critical structural applications where the absence of a longitudinal weld is treated as a meaningful reliability factor.
Hot Finished Seamless vs Hot Finished Welded (SHS/RHS) Hollow Sections
| Factor | Seamless (Hot Pierced/Rolled) | Welded (Hot Finished from Tube) |
|---|---|---|
| Weld seam | None | Present (in the parent welded tube before hot finishing) |
| Available shapes | Circular (CHS) only | Circular, Square, Rectangular |
| Maximum diameter | Generally limited to ~660mm | Can extend to larger sizes via welded tube starting material |
| Circumferential property uniformity | Very high | High, but seam area can show minor local variation |
| Typical unit cost | Higher | Lower |
| Best-fit applications | Fatigue/dynamic loading, offshore, high-integrity circular columns | General structural framing, most SHS/RHS building applications |
| Standard | EN 10210 | EN 10210 (welded route) |
Buying Guide: How to Select Hot Finished Seamless Structural Hollow Section
- Confirm your application actually requires seamless construction. Seamless CHS carries a cost premium over welded hollow sections; reserve it for applications where fatigue performance, torsional loading, or weld-seam-free integrity is a genuine structural requirement rather than a default specification.
- Check diameter availability against seamless production limits. Seamless hollow section production is generally limited to smaller diameters than welded tube (commonly up to ~660mm depending on the mill); for larger circular sections, hot finished welded CHS is typically the only practical route.
- Match the toughness grade suffix to your service temperature and loading. As with welded hot finished sections, confirm whether your design requires J0, J2, K2, or higher toughness grades based on minimum service temperature and the presence of dynamic or fatigue loading.
Frequently Asked Questions (FAQ)
Q: What is the difference between seamless and welded hot finished hollow sections?
A: Seamless hollow sections are formed by piercing and rolling a solid steel billet, with no weld seam anywhere in the tube. Welded hot finished hollow sections start from strip or plate that is formed and welded into a tube, which is then hot finished. Both fall under EN 10210, but the absence of a weld seam in seamless sections generally means more uniform circumferential properties and no weld-related inspection requirement.
Q: Why would a structural engineer specify seamless over welded hollow section?
A: The most common reasons are fatigue performance (avoiding a weld toe as a crack initiation point under cyclic loading), torsional loading applications, or a project specification that treats weld-seam-free construction as a reliability requirement - common in offshore, marine, and some mechanical-structural applications.
Q: Are seamless hollow sections available in square or rectangular shapes?
A: No - the seamless piercing and rolling process produces circular hollow sections (CHS) only. Square and rectangular hot finished hollow sections (SHS/RHS) are produced from welded tube that is subsequently formed and hot finished.
Q:What is the maximum diameter available in hot finished seamless CHS?
A: Seamless production is generally limited to approximately 660mm outer diameter, though the exact maximum depends on the specific mill's piercing and rolling equipment. For larger circular sections, hot finished welded CHS is the standard alternative.
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