Home > Hollow Sections > Round Hollow Sections (CHS)
Inox Steel India is a leading manufacturer, supplier, and exporter of Round Hollow Sections (CHS) engineered for high-strength structural applications across India, GCC, Africa, Europe, and the Americas.
Our CHS products meet the stringent requirements of IS 1161, IS 3601, EN 10219, and ASTM A500, making them suitable for industrial sheds, solar structures, fabrication, heavy engineering, and architectural designs requiring superior load-bearing performance and torsional rigidity.
With advanced ERW and HFIW production lines, state-of-the-art forming mills, and ISO-certified quality systems, Inox Steel India ensures every CHS delivers:
• Uniform mechanical properties
• Superior welding compatibility
• Dimensional accuracy
• High strength-to-weight ratio
• Enhanced performance under dynamic load conditions
We export CHS in OD ranges from 21.3 mm to 508 mm, with thicknesses up to 20 mm in multiple surface finishes including black, painted, GI, and oiled—making CHS a versatile choice for modern infrastructure and fabrication industries.
Round Hollow Sections (CHS) are circular structural steel tubes engineered for applications where uniform strength, smooth geometry, and high structural efficiency are required. Because of their symmetrical shape, CHS distributes loads evenly and offers excellent resistance to bending, torsion, and buckling.
CHS tubes provide outstanding strength-to-weight ratio, weldability, and structural stability, making them widely used in construction frameworks, solar mounting systems, industrial structures, bridges, and architectural steel fabrication.
The manufacturing of Circular Hollow Sections follows a precise and controlled process:
This advanced manufacturing process ensures consistent mechanical properties, excellent dimensional accuracy, and long structural durability.
CHS offers multiple engineering and structural advantages compared with conventional solid sections:
✔ Uniform Strength Distribution
Circular geometry ensures equal strength in all directions.
✔ Excellent Structural Efficiency
High strength-to-weight ratio reduces material consumption while maintaining load capacity.
✔ Superior Resistance to Bending & Torsion
The round shape improves performance under compressive and torsional loads.
✔ Excellent Weldability
CHS can be easily welded and fabricated into complex structures.
✔Smooth Surface Finish
The clean geometry is ideal for architectural and aesthetic applications.
✔Long Service Life
Protective coatings such as galvanizing enhance corrosion resistance in outdoor environments.
✔Cost-Effective Structural Solution
Efficient material utilization reduces overall project cost.
These benefits make Circular Hollow Sections a preferred structural material for construction, infrastructure, renewable energy projects, and industrial fabrication worldwide.
When selecting CHS for structural applications, several engineering factors should be evaluated:
India
Demand for CHS continues to grow across infrastructure and manufacturing sectors including:
Major demand centers include Mumbai, Pune, Ahmedabad, Chennai, Hyderabad, and Jaipur.
GCC & Middle East
Large-scale infrastructure and renewable energy projects drive demand in:
Africa
Rapid infrastructure development is increasing CHS consumption in:
Europe & Americas
Engineering and construction industries prefer EN 10219 S355J2H and ASTM A500 Grade C due to their certified structural performance and international compliance.
Inox Steel India supplies high-quality CHS tubes meeting global standards with consistent quality, traceability, and reliable export delivery.
Round Hollow Sections (CHS) are engineered for a wide range of structural, architectural, and fabrication uses.
Each standard — IS 1161, IS 3601, EN 10219, and ASTM A500 — delivers unique mechanical strengths, making CHS suitable for everything from lightweight frameworks to heavy industrial load-bearing structures.
Below is the grade-wise application mapping similar to the seamless pipe sample:
🔹 IS 1161 (YSt 210 / YSt 240 / YSt 310) – Structural Fabrication
Service Use:
General structural applications requiring moderate-to-high strength, good weldability, and consistent dimensional accuracy.
Typical Applications:
Size Range:
21.3 mm – 508 mm OD
Mechanical Advantage:
Suitable for mid-load civil structures requiring cost-effective performance.
🔹 IS 3601 – Mild Steel Tubes for General Engineering
Service Use:
General-purpose mechanical and fabrication work where formability and weldability are critical.
Typical Applications:
Size Range:
15 mm – 300 mm OD
Industry Sectors:
Fabrication | Automotive | Furniture | Light mechanical engineering
🔹 EN 10219 (S235JRH / S275JRH / S355J2H) – High-Strength Structural Sections
Service Use:
Cold-formed CHS for heavy structural load-bearing applications.
High yield strength & excellent impact toughness.
Typical Applications:
Size Range:
21.3 mm – 610 mm OD
Strength Advantage:
S355J2H → Used where higher moment capacity and rigidity are required
| Parameter | IS 1161 (Structural) | IS 3601 (MS Tubes) | EN 10219 (Cold-Formed Structural) | ASTM A500 (Structural Tubing) |
|---|---|---|---|---|
| Material Type | Mild Steel / Structural Steel | Mild Steel (Commercial/Structural) | Cold-Formed Structural Steel | Carbon Steel Structural Tubing |
| Common Grades | YSt 210, YSt 240, YSt 310 | Class A / B | S235JRH, S275JRH, S355J2H | Grade A, B, C |
| Product Type | Round Hollow Sections (CHS) | Circular Hollow MS Pipes | Circular Hollow Structural Sections | Circular Hollow Structural Tubes |
| Manufacturing | ERW / HFIW | ERW / HFIW | Cold-Formed / HF Welded | ERW / Seamless (limited) |
| Service Use | Structural, Fabrication, Canopy, Frames | General Engineering, Water Lines | High-strength structures, Solar, Industrial | High-strength structural applications |
| Temperature Capability | Ambient to ~350°C | Ambient | Ambient to ~350°C | Ambient to ~350°C |
| Yield Strength | 210–310 MPa | ~200–250 MPa | 235–355 MPa | 228–345 MPa |
| Tensile Strength | 330–450 MPa | 320–410 MPa | 360–510 MPa | 400–550 MPa |
| Elongation | 10–20% | 8–20% | 22% | 21–25% |
| Corrosion Resistance | Low–Moderate | Low–Moderate | Moderate | Moderate |
| Weldability | Excellent | Excellent | Excellent | Excellent |
| Chemical Composition | C ≤0.20–0.25 | C ≤0.25 | C ≤0.22 (S355) | C ≤0.26 |
| OD Range | 21.3–508 mm | 15–300 mm | 21.3–610 mm | 21.3–508 mm |
| Wall Thickness Range | 1.6–20 mm | 1.2–10 mm | 1.6–20 mm | 1.6–20 mm |
| Schedules | Not by SCH – Defined by WT | WT-based | WT-based | WT-based |
| End Condition | Plain / Bevelled | Plain | Plain / Bevelled | Plain / Bevelled |
| Surface Finish | Black, Oiled, Painted, GI | Black / GI | Black / GI | Black / Painted |
| Testing Standard | IS 1161 | IS 3601 | EN 10219 | ASTM A500 |
| Testing Requirements | Drift / Flattening / Hydro | Hydro / Drift | Charpy / UT / Flattening | UT / Flattening / Hydro |
| Applications | Structures, Fabrication, Solar | Water Lines, Light Fabrication | Industrial Sheds, Solar, Heavy Structures | Heavy Structural Tubing, Construction |
| Equivalent Standards | EN 10219 (S355), ASTM A500 | EN 10255 | ASTM A500 | EN 10219 |
Service Use
High-strength, weldable Circular Hollow Sections (CHS) designed for structural and architectural applications.
Typical Applications
Size & Temperature Range
Size Range
21.3 mm – 508 mm OD
Temperature Range
Suitable for ambient and sub-zero service conditions.
Grade C is generally preferred for better toughness and structural strength.
CHS Size Range & Dimensional Chart
Standard CHS Dimensions (Indicative)
| OD (mm) | Thickness (mm) | Approx. Weight (kg/m) |
| 21.3 | 1.6 | 0.85 |
| 33.7 | 2.0 | 1.71 |
| 48.3 | 2.9 | 3.10 |
| 60.3 | 3.2 | 4.34 |
| 76.1 | 3.6 | 6.22 |
| 114.3 | 4.5 | 12.10 |
| 168.3 | 5.0 | 19.65 |
| 219.1 | 6.0 | 31.35 |
| 273.1 | 7.0 | 46.40 |
| 323.9 | 8.0 | 64.70 |
| 406.4 | 10 | 104.30 |
Full CHS weight charts (IS / EN / ASTM) are available on request.
CHS Price List (Indicative)
| Grade / Standard | OD Range | Avg Price (₹/kg) | Avg Price ($/kg) | Typical Use |
| IS 1161 YSt 210 | 21.3–508 mm | ₹70 – ₹82 | $0.90 – $1.05 | Structural fabrication |
| IS 1161 YSt 310 | 21.3–508 mm | ₹80 – ₹95 | $1.00 – $1.20 | Heavy structures |
| EN 10219 S355J2H | 33.7–508 mm | ₹95 – ₹120 | $1.20 – $1.50 | Solar, PEB, industrial |
| ASTM A500 Grade C | 33.7–508 mm | ₹100 – ₹130 | $1.25 – $1.60 | Structural and architectural |
Prices may vary depending on thickness, finish (Black/GI), order quantity, and raw material cost.
CHS HSN / HS Code Classification
Inox Steel India performs all quality checks as per IS / EN / ASTM standards to ensure structural reliability and dimensional accuracy.
Dimensional Inspection
Mechanical Testing
Non-Destructive Testing (NDT)
Flattening Test
Performed to evaluate weld strength and ductility.
Drift Expansion Test
Verifies weld integrity and base metal strength.
Hydrostatic Pressure Test
Leak-proof pressure testing for selected grades.
Surface Inspection
Visual inspection for roughness, scale and imperfections.
Certification
Supplied with EN 10204 – 3.1 / 3.2 Mill Test Certificates.
End-to-End Manufacturer
Modern forming mills in Mumbai and Ahmedabad ensure consistent supply of CHS pipes.
Certified Production
Manufactured according to IS 1161, IS 3601, EN 10219 and ASTM A500 standards.
Material Traceability
Each pipe supplied with MTC EN 10204 – 3.1 / 3.2 and heat number stamping.
Large Ready Stock
21.3 mm to 508 mm OD available in Black, GI and Painted finishes.
Custom Length Supply
Available in 6 m, 12 m and custom cut lengths for solar and PEB structures.
Export Logistics
Fast dispatch via JNPT, Mundra and Hazira ports with export packaging.
Third-Party Inspection
SGS, BV, DNV, Lloyd’s and TÜV inspection available on request.
Competitive Pricing
Transparent pricing with fast delivery across India and global markets.
As with seamless pipes, our focus is not only supplying CHS — we strengthen your structural supply chain with reliable quality and predictable performance.
Exactly same formatting as the sample — table style.
| Industry | Application | Preferred Grade / Standard |
|---|---|---|
| Construction & PEB | Columns, Trusses, Building Frames | IS 1161 YSt 210/310, EN 10219 S355J2H |
| Solar Power | Module Mounting Structures | EN 10219 S355J2H, ASTM A500 Gr B/C |
| Engineering & Fabrication | Machinery Frames, Conveyor Structures | IS 3601, IS 1161 |
| Automotive & Trailers | Axles, Chassis, Truck Frames | ASTM A500 |
| Infrastructure | Walkways, Poles, Signage, Bridges | EN 10219 |
| Architectural | Railings, Circular Aesthetic Structures | IS 1161 / ASTM A500 |
Each project demands precision — we match grade + diameter + thickness exactly to the structural and load-bearing requirement.
Your seamless pipe page structure is copied exactly:
All CHS are export-packed as per international structural steel shipping standards:
🌍 Regular Export Destinations:
UAE · Saudi Arabia · Oman · Qatar · Kuwait · Egypt · Nigeria · South Africa · Germany · Italy · UK · USA · Brazil · Mexico
IS 1161, IS 3601, EN 10219 (S235JRH / S355J2H), and ASTM A500 (Grade A/B/C).
From 21.3 mm to 508 mm OD with thicknesses 1.6 mm to 20 mm.
Black, Oiled, GI, Painted.
Yes — Middle East, Africa, Europe, USA, and South America.
Yes, 6 m, 12 m, and custom cut lengths.