Home > Hollow Sections > IS 1161 Circular Hollow Sections (CHS)
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.
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.
For Circular Hollow Sections (CHS) as per BIS Standard
| Parameter | IS 1161 (Indian Standard – Structural Steel Hollow Sections) |
|---|---|
| Product Types | Circular Hollow Sections (CHS) |
| Material Grades | YSt 210 • YSt 240 • YSt 310 • YSt 355 |
| Yield Strength | YSt 210 = 210 MPa • YSt 240 = 240 MPa • YSt 310 = 310 MPa • YSt 355 = 355 MPa |
| Tensile Strength | 330–510 MPa (depending on grade) |
| Manufacturing Process | ERW / HFIW welded tubes, cold-formed |
| Section Type | Structural hollow circular sections |
| Dimensional Range (CHS) | 21.3 mm to 508 mm OD |
| Thickness Range | 1.5 mm to 20 mm |
| Length Range | 6m / 12m / Cut-to-length |
| Corner Radius | Not applicable (CHS) |
| Weld Type | Longitudinal ERW weld seam |
| Surface Condition | Black/bare, pickled & oiled, galvanized (GI/HDG optional) |
| Straightness Tolerance | As per IS 1161:2014 |
| Dimensional Tolerances | OD ± (0.75% or 0.3 mm), Thickness ±10% |
| Equivalent Standards | ASTM A500, EN 10219, IS 4923 (SHS/RHS) |
| Mechanical Tests | Tensile, yield, elongation |
| NDT | Weld seam eddy current or ultrasonic testing |
| End Condition | Plain ends, deburred |
| Heat Treatment | Not mandatory; supplied as cold-formed welded CHS |
| Applications | Structural engineering, fabrication, infrastructure, machinery frames, supports, poles |
| Coating Compatibility | GI, HDG, epoxy & PU coatings compatible |
| Property | IS 1161 | IS 4923 | EN 10219 | ASTM A500 |
|---|---|---|---|---|
| Shape | CHS only | SHS/RHS/CHS | SHS/RHS/CHS | SHS/RHS/CHS |
| Region | India | India | Europe | USA |
| Strength Level | Moderate–High | Moderate–High | High (J0H/J2H) | High (Grade C/D) |
| Typical Use | Structural CHS | Structural SHS/RHS | Structural & architectural | HSS structural tubing |
| 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 |
Circular geometry offers distinct engineering advantages for project safety and efficiency.
Optimized Load-Bearing:
Uniform load distribution due to circular geometry
Resistance Properties:
Efficient for compression, bending, and torsion loads
Joint Versatility:
Ideal for welded and bolted connections
Environmental Durability:
Suitable for outdoor use with GI / HDG coating
Economic Efficiency:
Cost-effective and widely available
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.
Below is the structured application breakdown aligned with your reference sample.
🔹 IS 1161 – YSt 210 (General Fabrication & Light Structures)
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
| 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 |
| Grade | Avg. Price (Rs./kg) | Avg. Price ($/kg) | Use Case |
|---|---|---|---|
| YSt 210 | Rs. 62 – Rs. 78 | $0.80 – $1.05 | Light structures |
| YSt 240 | Rs. 68 – Rs. 85 | $0.90 – $1.12 | Medium structures |
| YSt 310 | Rs. 75 – Rs. 95 | $1.00 – $1.25 | Structural frameworks |
| YSt 355 | Rs. 82 – Rs. 110 | $1.10 – $1.45 | Heavy-duty structures |
Pricing varies based on OD, thickness, coating, and export destination.
IS 1161 requires strict testing for structural steel circular hollow sections.
Testing & Quality Checks:
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.
| 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.
Inox Steel India exports large volumes of IS 1161 CHS to GCC, Africa, Southeast Asia, and Europe for structural and engineering projects.
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.
Our technical and commercial teams assist with grade selection, size optimization, coating requirements, and project-specific pricing for IS 1161 CHS. Request weight charts, MTC samples, and export-ready quotations.
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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?
Inox Steel India manufactures IS 1161 structural circular hollow sections in grades YSt 210, YSt 240, YSt 310 & YSt 355. Ideal for construction, fabrication, machinery frames, poles, and industrial applications. Available in black, oiled, GI & HDG finishes.