ConstructionConstruction Frameworks
Beams, roof purlins, structural supports
IS 4923 | SRMB Realfabrica
Rectangular Hollow Section Manufacturer in India : IS 4923
If you're sourcing a rectangular tube, rectangular steel pipe, MS rectangular hollow section, or RHS for a beam, truss, or structural framing application, this page covers what you need to specify one correctly: size range, thickness options, applicable IS code, grade, and where a rectangular profile fits best on a project. SRMB Realfabrica manufactures rectangular hollow sections at SRMB Srijan's integrated steel plant in Durgapur, West Bengal, rolling our own hot rolled coil into finished rectangular sections on Cold Formed ERW lines, under IS 4923.
IS 4923
Product Standard
YST 240
Top Grade
40×20
Smallest Size mm
Durgapur
Integrated Plant
Product Overview
Rectangular Hollow Section (RHS)
A rectangular hollow section gives more bending strength along one axis — the right choice for beams, purlins, and trusses where load direction is predictable. Unlike an I-section, the hollow closed form provides torsional rigidity and clean flat faces for bolted or welded connections.
SRMB Realfabrica manufactures RHS at our integrated plant in Durgapur — from rolled coil we produce ourselves, through Cold-Formed ERW lines, to IS 4923 certified finished section. Every batch is tested for mechanical and chemical compliance before despatch.
IS 4923YST 210 & YST 24040×20 – 96×48 mm1.0 – 4.5 mm thick6 m – 7 m lengths
IS 4923 Certified
Hollow steel sections for structural use — SHS & RHS
YST 210 & YST 240
Standard and high-strength grades — both available
CF ERW Process
Cold-Formed Electric Resistance Welded
IMS Certified
ISO 9001 · ISO 14001 · ISO 45001
Batch-Level Testing
Physical, Weld, Surface & Dimensional checks every batch
Primary Steel Producer
Iron ore to finished section at one plant, Durgapur
Technical Specifications
| Specification | Detail |
|---|---|
| Product standard | IS 4923 (Hollow steel sections for structural use, square and rectangular) |
| Size range | 40mm x 20mm to 96mm x 48mm |
| Thickness range | 1.0mm to 4.5mm |
| Grade | YST 210, YST 240 (higher grades also manufactured on request) |
| Standard length | 6 metres to 7 metres, custom lengths available on request |
| Surface finish | Black, precision finish |
| Input material | Hot rolled coil conforming to IS 10748 |
| Forming process | Cold Formed ERW (Electric Resistance Welded) |
We manufacture across a range of intermediate sizes between 40mm x 20mm and 96mm x 48mm, including commonly specified sizes such as 50x25, 60x40, 66x33, 70x30, and 80x40mm. For a specific size and thickness combination, our technical team can confirm current availability.
| Grade | Yield Strength (YST), Min. | Ultimate Tensile Strength (UTS), Min. | Elongation, Min. |
|---|---|---|---|
| YST 210 | 210 MPa | 330 MPa | 12% (up to 25.4mm), 20% (above 25.4mm) |
| YST 240 | 240 MPa | 410 MPa | 10% (up to 25.4mm), 15% (above 25.4mm) |
These figures represent minimum guaranteed values — the actual performance of any batch we supply meets or exceeds what is shown here.
| Parameter | Tolerance |
|---|---|
| Outside dimension | +/- 1% of nominal size, minimum +/- 0.50mm |
| Thickness | +/- 10% |
| Squareness | 90 degrees +/- 2 degrees |
| Corner radius | 3t maximum (t = wall thickness) |
| Weight, individual lengths | +10% / -8% |
| Weight, 10 tonne lot | +/- 7.5% |
Weld with standard MS electrodes — no preheating needed. Seal cut ends with a welded end plate to prevent moisture ingress. Sections are bundled and strapped for transport.
Where Rectangular Hollow Sections Are Used
Rectangular sections suit applications where bending load is directional — beams span horizontally, trusses carry roof loads, frames resist known wind directions.
Construction
IndustrialIndustrial Trusses & Sheds
Shed rafters, portal frames, roof trusses
FurnitureFurniture Manufacturing
Table bases, shelving frames, chair structures
IndustrialMachine Frames
Industrial equipment, conveyor frames, plant structures
RetailRetail & Commercial Fixtures
Display stands, retail shelving, exhibition stalls
ArchitecturalArchitectural Features
Pergolas, canopies, facade elements
Why Rectangular Hollow Section?
1
Directional Strength
More bending resistance along the longer axis — ideal for beams and trusses where load direction is known.
2
Material Efficiency
Steel is placed where it carries load, reducing material and transport weight compared to over-sized alternatives.
3
Flush Connections
Flat faces allow clean bolted and welded joints — simpler fabrication than open sections.
4
IS 4923 Certified
Batch-tested against IS 4923 — every length comes with a dependable, verifiable specification.
Handling and Site Considerations
Weldability
SRMB Realfabrica rectangular hollow sections can be welded using standard MS electrodes without preheating, allowing straightforward fabrication and site jointing.
Open Ends
Sections are supplied with open ends. We recommend sealing exposed ends with a welded end plate on site to prevent moisture ingress and internal corrosion over the working life of the structure.
Packaging
Sections are bundled and strapped for safe transit and site handling, with bundle labelling that identifies size, thickness, grade, and batch to support easy identification on receipt at site.
Frequently Asked Questions
A rectangular hollow section is a structural steel tube with a rectangular cross section and hollow core, used where more bending strength is needed along one axis. It's also called rectangular tube, rectangular steel pipe, or MS rectangular hollow section.
We manufacture rectangular hollow sections from 40mm x 20mm to 96mm x 48mm, including standard sizes such as 50x25, 60x40, and 80x40mm, under IS 4923.
Our rectangular hollow sections are available in thicknesses from 1.0mm to 4.5mm. Not every size is available in every thickness, so please confirm your exact combination with our technical team.
SRMB Realfabrica rectangular hollow sections conform to IS 4923, which covers hollow steel sections for structural use in square and rectangular profiles.
We manufacture rectangular hollow sections in YST 210 and YST 240 as standard grades, with higher grades available on request for projects requiring greater yield strength.
Standard supply length is 6 metres to 7 metres. Custom lengths can be arranged on request for specific project requirements.
Rectangular hollow sections are used for construction frameworks, beams, furniture manufacturing, automotive chassis, machine frames, retail displays, and architectural features.
Outside dimension tolerance is +/- 1% (minimum +/- 0.50mm), thickness tolerance is +/- 10%, and squareness is held to 90 degrees +/- 2 degrees, as per IS 4923.
Controlled chemistry and a smooth surface finish support good corrosion resistance. Sealing all open ends with a welded end plate further protects against internal corrosion over the section's working life.
Yes. SRMB Realfabrica rectangular hollow sections can be welded using standard MS electrodes without any preheating required beforehand.
For weight per length and a detailed size chart for your required specification, please contact our technical team or download our product brochure for the latest data.
Rectangular sections have unequal sides, giving more strength along one axis, which suits beams and trusses. Square sections have equal sides and spread load evenly in all directions, which suits columns.
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