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Inox Steel India is a leading manufacturer and supplier of IS 1161 Circular Hollow Sections (CHS), delivering structural-quality ERW tubes engineered for construction, fabrication, machinery frameworks, architectural supports, and infrastructure applications. Manufactured strictly as per IS 1161:2014, our CHS tubes offer consistent dimensional accuracy, dependable mechanical properties, and excellent weldability for a wide range of static and dynamic structural designs.
IS 1161 is the Indian standard governing structural steel circular hollow sections. These tubes are widely used for load-bearing structures, trusses, towers, frames, pole fabrication, mechanical supports, and general engineering applications. Available in grades YSt 210, YSt 240, YSt 310, and YSt 355, IS 1161 CHS provides a reliable strength-to-weight ratio suitable for both medium and heavy-duty structures.
Inox Steel India supplies a broad dimensional range of structural CHS:
Our products adhere to strict tolerances for OD, wall thickness, straightness, and weld quality, making them suitable for industrial, commercial, and infrastructure projects across India, the Middle East, Africa, and Southeast Asia.
IS 1161 CHS are produced through a high-precision forming and welding process designed to ensure structural reliability and consistent performance.
1️⃣ Coil Selection & Slitting
High-quality structural steel coils are selected and slit to precise widths to match the required CHS dimensions.
2️⃣ Forming into Circular Shape
The steel strip is progressively rolled into a circular shape using a multi-stage forming mill to achieve uniform rounding.
3️⃣ High-Frequency ERW Welding
Edges are fused using high-frequency induction welding (HFIW), ensuring a strong and continuous weld seam suitable for structural use.
4️⃣ Weld Bead Removal & Sizing
Internal and external weld beads are removed (if required), followed by precise sizing rolls to achieve accurate OD and thickness.
5️⃣ Straightening & Finishing
Tubes undergo straightening to maintain structural accuracy, followed by surface finishing—black, oiled, or galvanized depending on requirement.
6️⃣ Mechanical & Dimensional Testing
Tensile strength, yield strength, elongation, and weld integrity are tested to ensure full IS 1161 compliance.
7️⃣ Final Inspection & Documentation
Each batch is inspected for dimensional tolerances, weld quality, and surface condition, accompanied by IS-compliant MTCs.
This controlled manufacturing route results in strong, durable, and fabrication-friendly CHS sections ideal for structural work.
IS 1161 CHS provides dependable performance for mid-to-heavy structural applications.
IS 1161 Grades – Strength Comparison
| Grade | Yield Strength | Applications |
|---|---|---|
| YSt 210 | 210 MPa | Light fabrication, railings, general structures |
| YSt 240 | 240 MPa | Medium load structures, machinery supports |
| YSt 310 | 310 MPa | Structural frameworks, trusses, towers |
| YSt 355 | 355 MPa | Heavy structures, poles, industrial fabrication |
Why IS 1161 CHS Is Preferred for Structural Applications
India
Used extensively in PEB structures, trusses, pole manufacturing, gates, and industrial support systems.
Middle East & GCC
Used for scaffolding, industrial sheds, fencing, light poles, and machinery frameworks.
Africa
Common in structural fabrication, rural infrastructure, agricultural structures, and equipment manufacturing.
Southeast Asia
Preferred for construction support, PEB frames, industrial equipment, and automotive structural components.
Applications and Technical Specifications by IS 1161 Grade
IS 1161 CHS tubes are used across structural fabrication, mechanical engineering, light-to-heavy construction, and industrial frameworks. Grades are selected based on load-bearing requirements, weldability, and end-use conditions.
Service Use:
Railings • Furniture frames • Light frames • Walkway supports • Fabrication works
Key Characteristics:
Good ductility and weldability; suitable for non-critical structural components.
Size Range:
CHS 21.3 to 168 mm OD
Thickness: 1.5 to 6 mm
Industry Sectors:
General fabrication • Interior structures • Lightweight framing
🔹 IS 1161 – YSt 240 (Medium Structural Applications)
Service Use:
Medium-load supports • Industrial sheds • Frames • Mechanical structures
Key Characteristics:
Balancing cost and strength; suitable for moderate load-bearing tasks.
Size Range:
CHS 33.7 to 219 mm OD
Thickness: 2 to 8 mm
Industry Sectors:
Construction • Warehousing • Industrial fabrication
🔹 IS 1161 – YSt 310 (Structural Applications)
Service Use:
Trusses • PEB structures • Towers • Supports • Machinery frames
Key Characteristics:
Higher strength and stability ideal for engineering structures.
Size Range:
CHS 42.4 to 355 mm OD
Thickness: 3 to 12 mm
Industry Sectors:
Infrastructure • Industrial projects • Fabrication engineering
🔹 IS 1161 – YSt 355 (Heavy Structural Applications)
Service Use:
Poles • High-load supports • Bridges • Structural beams • Load-bearing columns
Key Characteristics:
High yield strength with excellent weldability for demanding structures.
Size Range:
CHS 48.3 to 508 mm OD
Thickness: 4 to 20 mm
Industry Sectors:
Heavy engineering • Construction • Telecom & power poles • Industrial machinery support
IS 1161 – Structural CHS Size & Weight Chart (Indicative)
| CHS OD (mm) | Thickness (mm) | Approx. Weight (kg/m) |
|---|---|---|
| 33.7 | 2.6 | 2.14 |
| 48.3 | 3.2 | 3.86 |
| 60.3 | 4.0 | 5.66 |
| 114.3 | 5.0 | 13.30 |
| 168.3 | 6.4 | 21.70 |
| 219.1 | 8.0 | 32.40 |
| 323.9 | 10.0 | 59.40 |
| 406.4 | 12.5 | 93.10 |
| 508.0 | 16.0 | 146.80 |
📩 Full IS 1161 weight chart available on request.
Indicative Price Range – IS 1161 CHS
| Grade | Avg. Price (₹/kg) | Avg. Price ($/kg) | Use Case |
|---|---|---|---|
| YSt 210 | ₹62 – ₹78 | $0.80 – $1.05 | Light structures |
| YSt 240 | ₹68 – ₹85 | $0.90 – $1.12 | Medium structures |
| YSt 310 | ₹75 – ₹95 | $1.00 – $1.25 | Structural frameworks |
| YSt 355 | ₹82 – ₹110 | $1.10 – $1.45 | Heavy-duty structures |
Pricing varies based on OD, thickness, coating, and export destination.
HSN / HS Code Classification
HSN 7306 — Welded structural steel tubular sections.
Applicable globally for IS 1161 CHS.
IS 1161 requires strict testing for structural steel circular hollow sections.
Mechanical Tests
Dimensional Checks
Weld Quality Testing
Documentation Provided
Inox Steel India is a trusted manufacturer and global supplier of IS 1161 Circular Hollow Sections (CHS), delivering structurally reliable and dimensionally accurate ERW tubes for engineering, construction, fabrication, and industrial applications. Our CHS sections are produced as per IS 1161:2014, ensuring consistent weld quality, superior mechanical performance, and long-term durability in both indoor and outdoor environments.
✔ Key Advantages of Choosing Our IS 1161 CHS
Our IS 1161 CHS tubes offer the ideal blend of strength, reliability, and value—suitable for projects across construction, engineering, and industrial sectors.
Industries & Applications We Serve
| Industry | Applications | Preferred Grades |
|---|---|---|
| Construction & Civil Engineering | Columns, poles, supports, frames | YSt 240 / 310 |
| Infrastructure | Trusses, PEB structures, bridges | YSt 310 / 355 |
| Mechanical & Industrial Fabrication | Machinery frames, conveyors, equipment supports | YSt 240 / 310 |
| Power & Utility | Solar structures, telecom towers, light poles | YSt 310 / 355 |
| Agricultural & Rural Structures | Greenhouses, sheds, irrigation supports | YSt 210 / 240 |
| Furniture & Fabrication | Railings, frames, custom fabrication | YSt 210 |
IS 1161’s versatility makes it suitable for both light and heavy structural applications.
Export Readiness & Packaging
Inox Steel India exports large volumes of IS 1161 CHS to GCC, Africa, Southeast Asia, and Europe for structural and engineering projects.
Export Packaging Includes
Major Export Regions
UAE • Saudi Arabia • Qatar • Oman • Bahrain
Kenya • Tanzania • South Africa • Nigeria
Malaysia • Indonesia • Vietnam
Bangladesh • Nepal • Sri Lanka
We offer full export documentation, including ISMTCs, commercial invoices, packing lists, and inspection certificates.
YSt 310 and YSt 355 are preferred due to higher yield strength. Yes. All grades offer excellent weldability for fabrication and erection. Yes. We supply GI and Hot-Dip Galvanized (HDG) CHS for outdoor and corrosion-prone environments. From 21.3 mm to 508 mm OD, with thickness up to 20 mm. Yes, to GCC, Africa, SEA, and global fabrication companies. Which grade is recommended for heavy structural applications?
Are IS 1161 CHS suitable for welding?
Are galvanized options available?
What sizes are available under IS 1161?
Do you export IS 1161 CHS?