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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.
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.
The ERW Pipe manufacturing process is fully automated and includes:
These advantages make CHS one of the most widely used structural steel products globally.
ParameterIS 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 |
Structural Load Requirement
Choose higher-yield grades like S355J2H or ASTM A500 Grade C for heavy structures.
Weldability
All CHS grades provide excellent weldability without preheating for most applications.
Thickness & OD Selection
Large ODs and heavier wall thicknesses provide higher moment capacity for longer spans.
Corrosion Environment
Choose GI or painted CHS for outdoor applications and coastal areas.
Compliance with Local Codes
Projects may require EN 10219 (Europe), ASTM A500 (US), or IS 1161 (India) depending on region.
Aesthetic Requirements
CHS provides smooth, visually clean geometry ideal for architectural designs.
India:
High consumption in Mumbai, Pune, NCR, Gujarat, Chennai for water lines, construction & fabrication.
GCC & Middle East:
UAE, Saudi Arabia, Oman import ERW pipes for infrastructure, mechanical works, and fabrication.
Africa:
Nigeria, Egypt, Kenya, South Africa source ERW CS/MS for water & structure.
Europe & Americas:
UK, Germany, USA, Brazil purchase ERW SS for food, architecture & light process applications.
Inox Steel India supports all these regions with ready stock + export packaging + fast dispatch from JNPT/Mundra/Hazira.
Below follows the same style as the stainless steel page — each grade/type has its own section.
ERW Carbon Steel Pipes (A53 / A500 / IS 3589 / API 5L)
Service Use:
Water, fire-fighting, process water, structural applications.
Typical Applications:
Size Range: ½″ – 24″ NB
Temperature Range: Ambient to 400°C
Industry Sectors: Construction | EPC Contractors | Water Boards | Fabricators | Agriculture
ERW Mild Steel Pipes (IS 1239 / IS 3589 Medium/Heavy)
Service Use:
Low-pressure structural & fabrication work.
Typical Applications:
Size Range: ½″ – 24″ NB
Temperature Range: Ambient to 350°C
Industry Sectors: Infrastructure | Fabrication | Furniture | Light Engineering
ERW Stainless Steel Pipes (304 / 304L / 316 / 316L)
Service Use:
Corrosion resistant utility lines, decorative structures, food-grade & chemical lines.
Typical Applications:
Size Range: ½″ – 12″ NB
Temperature Range: -196°C to +870°C
Industry Sectors: Pharma | Chemical | Food & Beverage | Architecture | Marine
| NPS (Inch) | OD (mm) | Wall Thickness (mm) | Approx. Weight (kg/m) |
|---|---|---|---|
| ½″ | 21.3 | 2.0 – 3.2 | 1.00 – 1.40 |
| 1″ | 33.4 | 2.6 – 3.6 | 1.80 – 2.45 |
| 2″ | 60.3 | 3.2 – 4.0 | 4.80 – 5.60 |
| 3″ | 88.9 | 3.2 – 5.0 | 7.20 – 10.20 |
| 4″ | 114.3 | 3.6 – 6.0 | 10.5 – 16.8 |
| 6″ | 168.3 | 4.5 – 7.1 | 20.8 – 30.2 |
| 8″ | 219.1 | 5.0 – 8.2 | 28.4 – 43.6 |
| 10″ | 273.1 | 6.0 – 9.3 | 40.2 – 63.1 |
| 12″ | 323.9 | 6.4 – 9.5 | 55.7 – 84.3 |
Prices vary by grade, heat treatment, thickness, and project requirements.
| Material / Grade | OD Range (mm) | INR/kg (F.O.B Mumbai) | USD/kg (F.O.B India) | Typical Use |
|---|---|---|---|---|
| ERW CS (A53 / IS 3589) | 17 – 610 | ₹ 60 – ₹ 85 | $ 0.75 – $ 1.05 | Water / Structural |
| ERW MS (IS 1239 Medium/Heavy) | 17 – 610 | ₹ 55 – ₹ 75 | $ 0.70 – $ 0.95 | Fabrication / Scaffolding |
| ERW SS 304 / 304L | 12 – 325 | ₹ 240 – ₹ 320 | $ 3.0 – $ 3.9 | Food / Decorative |
| ERW SS 316 / 316L | 12 – 325 | ₹ 320 – ₹ 450 | $ 3.9 – $ 5.4 | Chemical / Marine |
Just like stainless steel seamless pipes, every ERW Pipe undergoes:
All materials are supplied with full documentation:
Just as engineers select stainless steel seamless pipes based on consistent metallurgy and global certifications, ERW Pipes must be sourced from a mill that ensures weld integrity, uniform thickness, surface finish quality, and full test documentation.
Inox Steel India brings all these capabilities together:
Top Reasons to Choose Inox Steel India
| Industry | Application | Material Used |
|---|---|---|
| Water Supply Boards | Transmission mains, distribution lines | ERW CS / MS |
| Fire-Fighting Systems | Hydrant lines, risers | ERW CS |
| Construction & Infrastructure | Structural supports, columns | ERW CS / MS |
| Fabrication Workshops | Frames, mechanical structures | ERW MS / CS |
| Furniture Manufacturing | Tubular furniture | ERW MS |
| HVAC & Mechanical | Supports, duct stands | ERW CS / MS |
| Pharma & Food | Utility & decorative lines | ERW SS 304 / 316 |
| Chemical Industries | Low-pressure fluid lines | ERW SS 316 |
| Automotive | Chassis, tubular components | ERW CS / MS |
Our packaging system follows the same export-grade standards as our seamless and welded stainless steel products:
🌍 Export Ports
🌎 Export Regions
This follows the exact export detailing style found in your stainless steel pipe page.
Inox Steel India supplies ERW Pipes with mill test certification, full traceability, and export packaging.
Whether you need carbon steel, mild steel, or stainless steel ERW Pipes — our team supports you with quick delivery, competitive prices, and technical guidance.
52-A, Mulji Thackersi Bldg, Islampura Street, Shop No. 10, Near Alankar Cinema, Mumbai – 400 004
alloy@inoxsteelindia.in, steel@inoxsteelindia.in
+91 9930796690
ASTM A53, A500, IS 3589, IS 1239, API 5L, and ASTM A312 (ERW SS).
ERW Pipes have a weld seam and are ideal for low/medium pressure. Seamless pipes have no weld and are used for high-pressure/high-temperature applications.
Yes, ERW CS/MS pipes are widely used in structures, frames, columns, trusses, and fabrication work.
Absolutely — IS 3589 and A53 ERW pipes are standard for water lines.
Yes — grades 304, 304L, 316, and 316L are available.
If you need ERW Pipes with guaranteed weld integrity, consistent dimensions, and export-ready documentation, Inox Steel India is your trusted manufacturer.
📞 Contact us today for the best price & fastest delivery.