About Hollow Sections
Cold-formed and hot-finished structural hollow sections, rectangular (RHS), square (SHS), and circular (CHS), for building frames, trusses, columns and industrial structures. Conforming to IS 4923, EN 10219, ASTM A500, and EN 10210.
Use this page as a product and specification reference. The quotation must state the exact material grade, dimensions, manufacturer, certification or document scope, inspection, quantity, price, current availability, freight, and proposed delivery timing for the specific RFQ.
Specification reference
| Types | RHS (Rectangular), SHS (Square), CHS (Circular) |
|---|---|
| Size Range | 20×20mm to 300×200mm (RHS/SHS), 21.3mm to 355.6mm OD (CHS) |
| Wall Thickness | 1.6mm to 10mm |
| Standards | IS 4923, EN 10219-1, EN 10210-1, ASTM A500 |
| Lengths | Reference mill lengths include 6 m, 9 m, and 12 m; confirm offered length, cut capability, and tolerance |
Confirm the exact grade, dimensions, tolerance, test certificate, and current availability for your requirement before ordering.
Common applications
These are enquiry contexts, not universal approvals. The project design and governing specification must approve the exact product, grade, dimensions, and service conditions.
- Construction: Building frames, columns, trusses, mezzanine floors.
- Infrastructure: Bridges, transmission towers, highway barriers, solar mounting.
- Industrial: Warehouse structures, conveyor frames, equipment supports.
- Architectural: Canopies, facades, handrails, furniture, exhibition structures.
Potential source references
The quotation must identify the proposed manufacturer, current availability, inspection documents, and delivery basis for the specific RFQ.
- APL Apollo
- Tata Structura
- Jindal Steel
- JSW Steel
- Surya Roshni
Applicable standards and specifications
RHS, SHS, and CHS definitions
RHS is a rectangular hollow section, SHS is a square hollow section, and CHS is a circular hollow section. Each is a closed steel profile rather than an open beam or channel. Designers select the shape and section properties for the load path, connection detail, and fabrication method.
IS 4923 is the Indian structural hollow-section standard used on this page. The catalogue also lists EN 10219-1, EN 10210-1, and ASTM A500 as alternative project references. These standards should not be mixed within one line item unless the engineer approves an equivalence route and acceptance values.
IS 800:2007 is cited in the existing product description for structural design context. The product certificate does not replace the structural calculation or approved drawing. A fabricator should order the exact section, grade, wall, and length shown in the bill of materials rather than selecting by outside dimensions alone.
Suitable buyers and duties outside this product page
Building-frame fabricators, industrial-shed contractors, solar-structure teams, conveyor builders, equipment manufacturers, and architectural metal shops use RHS, SHS, or CHS. PWD contractors may also procure these sections when the tender drawing and material specification name the structural tube standard and grade.
A hollow section should not be substituted for water, gas, hydraulic, or boiler pipe from shape or OD alone. Pressure products have different test, dimensional, end, and documentation requirements. IS 4923 grade language also differs from the class terminology used for IS 1239 utility pipe.
Furniture and light fabrication may use smaller sections, while columns and primary frames require engineer-selected members. This page cannot approve a section for load, wind, vibration, fire, fatigue, or connection capacity. Send the approved member schedule and connection drawings when the requirement carries structural responsibility.
How Kanpur fabricators specify hollow sections
Start with shape, standard, and grade. Write RHS as width x height x wall, SHS as side x side x wall, and CHS as OD x wall. Add length, piece count or MT, permitted length tolerance, and whether the quotation may use standard mill lengths with a cutting plan.
The catalogue lists YSt 240 and YSt 310 for IS 4923, plus S235 and S355 families and ASTM A500 Grade B or C for other specifications. Use the grade exactly as the approved drawing states. A supplier should not replace one standard with another because the quoted dimensions appear identical.
Define finish as black, painted, or galvanized only where the project accepts it. Add surface preparation, coating system, masked areas, drain or vent provisions, and touch-up responsibility when fabrication or galvanizing is included. State whether ends need saw cutting, squareness, mitres, slots, or base-plate preparation.
Request the inspection-document type named by the tender, heat or batch traceability, dimensional report, and TPI when required. IBR Form III-C is for boiler mountings and fittings, not routine structural hollow-section documentation. Include bundle tags, packing, ex-warehouse Kanpur terms, applicable taxes, freight, and unloading conditions.
- Shape: identify RHS, SHS, or CHS and write dimensions in the correct order.
- Material: state standard, grade, wall, length, and approved substitution rule.
- Fabrication: define cut ends, holes, slots, mitres, welding, and coating scope.
- Documents: request MTC 3.1, dimensions, markings, packing list, and TPI where required.
- Commercial basis: separate ex-warehouse Kanpur rate, GST, processing, freight, and unloading.
Hollow-section comparison for Kanpur procurement
The table summarizes the catalogue ranges and the decisions a buyer must add. It does not rank one shape above another because the drawing and connection design control the selection.
| Section | Listed size range | Wall range | Length options | RFQ focus |
|---|---|---|---|---|
| RHS | 40 x 20 to 300 x 200 mm | 1.6-10 mm | 6, 9, or 12 m | Width, height, wall, grade, corner and connection details |
| SHS | 20 x 20 to 250 x 250 mm | 1.6-10 mm | 6, 9, or 12 m | Side, wall, grade, cut length and orientation marking |
| CHS | 21.3-355.6 mm OD | 1.6-10 mm | 6, 9, or 12 m | OD, wall, grade, end preparation and connection detail |
| Custom cut section | Within approved catalogue route | As ordered | Cut to PO | Cut list, tolerance, remnant ownership, marking and packing |
Final section properties, tolerances, grade, test requirements, and suitability must follow the approved design and inspection documents.
Worked CHS weight example for a fabrication BOQ
For a circular hollow section with 50 mm OD and 4 mm wall, calculate weight = (50 - 4) x 4 x 0.02466 = 4.54 kg/m. The formula applies to the circular steel section, not directly to RHS or SHS.
Using the displayed 4.54 kg/m value, a 6 m CHS length has a theoretical mass of 27.24 kg before coating, end plates, fabrication, or permitted manufacturing variation. Multiply that mass by the required piece count for a BOQ estimate, then keep cutting waste and fabricated attachments on separate lines.
Theoretical weight helps compare offers quoted by metre, piece, or MT. The MTC, measured dimensions, and accepted commercial basis govern supply. RHS and SHS need the applicable section table or a shape-specific calculation, so a buyer should not force the circular formula onto rectangular geometry.
Fabrication inspection and common ordering failures
Dimension order is a purchase-description risk. Mark RHS width and height exactly as the drawing uses them, especially when connection plates fit only one orientation. Check section size, wall, grade, length, straightness, twist, end squareness, and visible damage before cutting.
Match bundle tags and member markings with the MTC. Mixed grade or wall lots should remain separated until traceability is complete. If fabrication removes the original mark, transfer identification under the project procedure before the first cut.
Inspect corners, weld line, dents, corrosion, and local deformation. Mechanical and technological tests must follow the ordered edition of the product standard, grade, dimensions, and purchase requirements. Put the applicable tests and acceptance evidence in the PO instead of relying on an unqualified structural-tube description.
Coating creates another handover risk. State whether pricing includes surface preparation, primer, galvanizing, touch-up, or bare supply. Measure critical connection dimensions after any process that the drawing requires to remain controlled. Photograph damaged bundles on arrival before unloading continues.
Kanpur dispatch planning for structural sections
Structural hollow-section buyers in Panki, Dada Nagar, Fazalganj, Jajmau, Chakeri, and surrounding UP fabrication areas should send a member schedule, grade, lengths, cut list, coating, MTC, inspection scope, packing, and destination PIN code. The quotation must identify proposed source and current availability.
Compare ex-warehouse Kanpur material with applicable taxes, processing, freight, and unloading listed separately. Long sections need a vehicle and site access plan that matches the ordered length. The accepted PO should state whether the buyer or supplier arranges unloading and how bundles must be supported.
City pages for Lucknow, Agra, Prayagraj, Varanasi, Gorakhpur, Jhansi, Bareilly, Patna, and Unnao provide enquiry context only. Require the quotation to confirm whether a route can be served and the proposed timing for the order.
Key points for hollow-section buyers
- Use the engineer-approved shape, standard, grade, dimensions, wall, and connection details.
- Do not mix IS 4923 structural grades with IS 1239 utility-pipe class language.
- Check orientation, wall, length, straightness, markings, and MTC before cutting.
- Use the circular weight formula only for CHS and the correct method for RHS or SHS.
- Separate material, processing, coating, GST, freight, and unloading in commercial comparisons.
What to include in the RFQ
- Specify the relevant standard or grade where known.
- Provide OD or NB, wall thickness or schedule, required length, and quantity.
- State the delivery city or PIN code and any unloading constraints.
- List MTC, IBR, TPI, marking, inspection, or other documentation requirements.