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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.
What Are Round Hollow Sections (CHS) & How Are They Manufactured?
Round Hollow Sections (CHS) are circular structural tubes designed for applications where equal load distribution, smooth geometry, and enhanced strength are essential. CHS offers excellent resistance to bending, buckling, and torsion due to its symmetrical shape.
Manufacturing Process (Technical Flow)
1️⃣ Slitting & Coil Preparation
High-quality steel coils are slit to the exact width needed for the OD of the CHS.
2️⃣ Forming
The strip is progressively shaped through rolls into a circular profile.
3️⃣ ERW / HFIW Welding
The edges are heated and fused using high-frequency induction welding.
→ Produces a strong, invisible weld seam perfectly aligned with the CHS axis.
4️⃣ Sizing & Calibration
The pipe is circularized using precision sizing rolls to meet OD and thickness tolerances of IS/EN/ASTM standards.
5️⃣ Non-Destructive Testing
Eddy current or ultrasonic testing is performed to ensure joint integrity.
6️⃣ Cutting & End-Finishing
Standard lengths (6m / 12m) or custom lengths are cut, with ends supplied plain or bevelled.
7️⃣ Surface Protection
Black, oiled, painted, or galvanized finish is applied depending on project requirements.
This highly controlled process results in structurally stable CHS suitable for high-load environments.
These advantages make CHS one of the most widely used structural steel products globally.
Grades & Standards (Technical Comparison Table)
👉 Insert Master Datasheet (already prepared earlier)
This comparative table helps engineers, consultants, and procurement teams identify the appropriate CHS grade for structural strength, load-bearing requirements, and compliance with international standards.
1️⃣ Structural Load Requirement
Choose higher-yield grades like S355J2H or ASTM A500 Grade C for heavy structures.
2️⃣ Weldability
All CHS grades provide excellent weldability without preheating for most applications.
3️⃣ Thickness & OD Selection
Large ODs and heavier wall thicknesses provide higher moment capacity for longer spans.
4️⃣ Corrosion Environment
Choose GI or painted CHS for outdoor applications and coastal areas.
5️⃣ Compliance with Local Codes
Projects may require EN 10219 (Europe), ASTM A500 (US), or IS 1161 (India) depending on region.
6️⃣ Aesthetic Requirements
CHS provides smooth, visually clean geometry ideal for architectural designs.
Global & Indian Demand Trends for CHS
India
Strong demand from:
GCC & Middle East
High demand for CHS in:
Africa
Growing consumption in:
Europe & Americas
Construction and engineering sectors prefer EN 10219 S355J2H and ASTM A500 Grade C due to structural compliance and certification requirements.
Inox Steel India supplies CHS to all these markets with consistent quality and timely global dispatch.
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
Service Use:
High-strength, weldable CHS for structural and architectural use.
Typical Applications:
Size Range:
21.3 mm – 508 mm OD
Temperature Range:
Suitable for ambient & sub-zero service (Grade C preferred for toughness).
📏 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 chart (IS / EN / ASTM) can be provided in PDF 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 Gr C | 33.7–508 mm | ₹100 – ₹130 | $1.25 – $1.60 | Structural/Architectural |
Note: Prices vary based on thickness, finish (Black/GI), quantity, and raw material cost.
🔢 CHS HSN / HS Code Classification
Inox Steel India performs all quality checks as per IS/EN/ASTM requirements, including:
✔ Dimensional Inspection
OD, thickness, ovality, straightness.
✔ Mechanical Tests
Tensile, Yield, Elongation.
✔ NDT (Non-Destructive Testing)
UT (Ultrasonic Test) or Eddy Current Test on welded seam.
✔ Flattening Test
To determine ductility and weld strength.
✔ Drift Expansion Test
To verify weld and base metal integrity.
✔ Hydrostatic Test
Leak-proof pressure testing for selected grades.
✔ Surface Check
Visual inspection for roughness, scale, and imperfections.
✔ Certification
EN 10204 – 3.1 / 3.2 available on request.
Result:
Every CHS leaving our mill meets the performance, dimensional, and structural requirements expected by architects, structural engineers, and fabrication specialists globally.
🏭 Why Choose Inox Steel India
✅ Key Advantages Our Clients Rely On:
1️⃣ End-to-End Manufacturer & Exporter
Modern forming mills in Mumbai & Ahmedabad ensure consistent supply of CHS in all sizes and grades.
2️⃣ Certified Quality
Production meets IS 1161 / IS 3601 / EN 10219 / ASTM A500 with complete dimensional and mechanical traceability.
3️⃣ Global Material Traceability
Each CHS is supplied with MTC EN 10204 – 3.1 / 3.2, heat number stamping & batch certification.
4️⃣ Ready Stock Across Standard Sizes
21.3 mm to 508 mm OD always available in Black / GI / Painted finishes.
5️⃣ Custom Lengths & Finishes
We supply 6 m, 12 m, and fully customized cut-lengths for PEB, solar, and fabrication projects.
6️⃣ Export Logistics Expertise
Fast dispatch via JNPT, Mundra, Hazira with seaworthy packaging.
7️⃣ Third-Party Inspection Support
SGS, BV, DNV, Lloyd’s, TUV approvals available on request.
8️⃣ Competitive Price + Fast Delivery
Transparent pricing across India & global markets with quick production cycles.
💡 As with seamless pipes, our focus is not just supplying CHS — we strengthen your structural supply chain with reliability and predictable quality.
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.