MS Round Pipe
Description
MS Pipes (Mild Steel Black Pipes) | IS 1239 / IS 3589 Certified
India's Most Trusted Mild Steel ERW Black Pipes for Structural, Industrial & Infrastructure Applications
Overview
MS Pipes, commonly known as Mild Steel Black Pipes or MS Black Pipes, are Electric Resistance Welded (ERW) steel pipes manufactured from low-carbon mild steel — making them one of the most versatile, cost-effective, and widely used pipe products across India's construction, fabrication, infrastructure, and industrial sectors. Their excellent weldability, consistent dimensional accuracy, and high tensile strength make them the go-to choice for engineers, fabricators, contractors, and procurement managers across project types and industries.
We stock and supply ISI-certified MS Black Pipes conforming to IS 1239 (Part 1) and IS 3589 Indian Standards, ensuring consistent quality, dimensional accuracy, and pressure-tested integrity in every pipe — sourced from India's most trusted manufacturers.
MS Pipe vs GI Pipe — Which One Do You Need?
A common question at every project site. Here's a quick guide:
| Parameter | MS Black Pipe | GI Pipe (Galvanized) |
|---|---|---|
| Corrosion Resistance | Low (requires coating/painting) | High (zinc-coated) |
| Recommended For | Structural, fabrication, dry indoor use | Water supply, outdoor, agriculture |
| Weldability | Excellent | Good |
| Cost | Lower | Slightly higher |
| Surface Finish | Black / Oiled | Zinc-coated silver finish |
| Lifespan (uncoated) | Moderate | Long |
Rule of thumb: Use MS Black Pipes where corrosion is not a concern or where pipes will be painted, coated, or embedded in concrete. Use GI Pipes where direct water contact, outdoor exposure, or underground installation is involved.
Why Choose ISI-Certified MS Pipes?
- BIS / ISI Certified — All pipes carry the ISI mark, confirming compliance with Bureau of Indian Standards dimensional, chemical, and mechanical requirements
- Premium Raw Materials — Manufactured using IS:10748 compliant Hot Rolled Coils (HRC) sourced from leading Indian steel producers including TATA Steel and SAIL
- Advanced ERW / HFIW Manufacturing — High Frequency Induction Welding (HFIW) technology produces a cleaner, more consistent weld seam compared to older low-frequency ERW processes
- Multi-Stage QC — Every pipe is inspected from raw material receipt to final dispatch, ensuring dimensional accuracy, uniform wall thickness, and consistent mechanical properties
- Hydrostatic Testing — Pipes are pressure-tested at 5 MPa (51 Kgf/cm²) to ensure leak-proof integrity before dispatch
- Versatile Supply Formats — Available in plain end, beveled end, screwed end (single/both), and screwed with socket configurations
- Customizable Coatings — Available with anti-corrosive oil, black varnish, red oxide primer, epoxy paint, or 3LPE cladding for enhanced protection in aggressive environments
Understanding the Standards: IS 1239 vs IS 3589
IS 1239 (Part 1) – 2004
The primary Indian Standard for MS Black Pipes. Covers ERW and HFIW welded mild steel pipes in sizes from 15 mm NB (½") to 150 mm NB (6"), classified into three wall-thickness categories:
| Class | Series | Wall Thickness | Typical Use |
|---|---|---|---|
| Class A | Light | Thinnest | Fencing, conduit, casing, low-load structural use |
| Class B | Medium | Standard | General fabrication, structural, gas lines, scaffolding |
| Class C | Heavy | Thickest | High-load structural, concealed embedding, industrial piping |
Equivalent International Standards: BS 1387 / EN 10255 / ASTM A53 / JIS G3452
IS 3589 – 2001
Covers larger diameter MS pipes from 168.3 mm OD (6" NB) and above for water conveyance, sewage systems, and large industrial pipelines. Available in:
- Grade FE 330 — Minimum tensile strength 330 MPa; general purpose
- Grade FE 410 — Minimum tensile strength 410 MPa; heavy-duty structural and industrial applications
Product Specifications
IS 1239 (Part 1) – MS Black Pipe Specifications (15 mm to 150 mm NB)
| Parameter | Specification |
|---|---|
| Standard | IS 1239 Part 1 – 2004 |
| Size Range | ½" (15 mm NB) to 6" (150 mm NB) |
| Classes Available | Class A (Light), Class B (Medium), Class C (Heavy) |
| Manufacturing Process | ERW (Electric Resistance Welded) / HFIW (High Frequency Induction Welded) |
| Material | Mild Steel (Low Carbon Steel) |
| Surface Finish | Black (Mill Finish), Anti-corrosive Oil, Varnish, Primer, Red Oxide, 3LPE |
| Pipe Length | 4 m, 5.5 m, 6 m standard; up to 12 m available |
| End Conditions | Plain End (PE), Screwed Without Socket, Screwed With Socket, Beveled End |
| HSN Code | 7306 |
IS 1239 Wall Thickness Reference Chart
| NB Size | OD (mm) | Class A – Thickness | Class B – Thickness | Class C – Thickness |
|---|---|---|---|---|
| ½" (15 mm) | 21.3 mm | 2.0 mm | 2.6 mm | 3.2 mm |
| ¾" (20 mm) | 26.9 mm | 2.3 mm | 2.6 mm | 3.2 mm |
| 1" (25 mm) | 33.7 mm | 2.6 mm | 3.2 mm | 4.0 mm |
| 1¼" (32 mm) | 42.4 mm | 2.6 mm | 3.2 mm | 4.0 mm |
| 1½" (40 mm) | 48.3 mm | 2.9 mm | 3.2 mm | 4.0 mm |
| 2" (50 mm) | 60.3 mm | 2.9 mm | 3.6 mm | 4.5 mm |
| 2½" (65 mm) | 76.1 mm | 3.2 mm | 3.6 mm | 4.5 mm |
| 3" (80 mm) | 88.9 mm | 3.2 mm | 4.0 mm | 4.8 mm |
| 4" (100 mm) | 114.3 mm | 3.6 mm | 4.5 mm | 5.4 mm |
| 5" (125 mm) | 139.7 mm | 4.0 mm | 4.5 mm | 5.4 mm |
| 6" (150 mm) | 165.1 mm | 4.0 mm | 4.5 mm | 5.4 mm |
IS 3589 – Large Diameter MS Pipe Specifications (Above 6" NB)
| Parameter | Specification |
|---|---|
| Standard | IS 3589 – 2001 |
| Grades | Grade FE 330 / Grade FE 410 |
| Size Range | 168.3 mm OD and above |
| Manufacturing Process | ERW / EFW (Electric Fusion Welded) |
| Application | Municipal water mains, industrial pipelines, large infrastructure |
Mechanical Properties
| Property | Class A (Light) | Class B (Medium) | Class C (Heavy) |
|---|---|---|---|
| Yield Strength (min.) | 195 MPa | 235 MPa | 275 MPa |
| Tensile Strength (min.) | 320 MPa | 360 MPa | 410 MPa |
| Elongation (min.) | 20% | 20% | 20% |
| Hydrostatic Test Pressure | 5 MPa (51 kgf/cm²) | 5 MPa (51 kgf/cm²) | 5 MPa (51 kgf/cm²) |
Chemical Composition (Base Mild Steel)
| Element | Max. Content |
|---|---|
| Carbon (C) | 0.20% |
| Manganese (Mn) | 1.30% |
| Phosphorus (P) | 0.040% |
| Sulfur (S) | 0.040% |
Low carbon content is what gives MS pipes their hallmark characteristic — excellent weldability — allowing them to be welded without pre-heating using all standard methods including MIG, TIG, arc, and gas welding.
Key Features & Benefits
- Outstanding Weldability — Low carbon composition allows easy welding without pre-heating or post-weld heat treatment, making MS pipes ideal for all fabrication and structural work
- High Tensile Strength — Tensile strength up to 410 MPa (Class C / IS 3589 FE 410) provides excellent load-bearing capacity for structural and industrial applications
- Dimensional Precision — Advanced ERW / HFIW manufacturing ensures consistent OD, uniform wall thickness, and straight pipe geometry for trouble-free installation and fabrication
- Easy to Cut, Drill & Thread — MS pipes can be cut, drilled, threaded, and bent with standard tools, enabling fast and flexible on-site fabrication without specialised equipment
- Cost-Effective — Significantly more economical than stainless steel, seamless, or alloy alternatives — delivering reliable structural performance at the lowest material cost
- Available with Protective Coatings — Supplied with anti-corrosive oil, varnish, primer, epoxy paint, or 3LPE cladding for extended service life in mildly corrosive or outdoor environments
- Versatile End Options — Plain end, beveled, screwed, and socketed configurations available to match any jointing method or piping system design
- ISI Marked — BIS certification guarantees adherence to dimensional, mechanical, and chemical composition benchmarks
- Wide Size Range — Available from ½" (15 mm NB) through large-diameter IS 3589 pipes, covering virtually every structural and industrial need
Applications
MS Black Pipes are specified across a wide range of structural, fabrication, and industrial applications:
Structural & Fabrication:
- Industrial sheds, warehouses, and pre-engineered building (PEB) frameworks
- Columns, beams, and structural supports in commercial and industrial buildings
- Scaffolding and construction staging systems
- Gates, grills, fencing, and boundary structures
- Staircases, handrails, balustrades, and mezzanine platforms
- Furniture frames, racks, and storage systems
Infrastructure & Civil:
- Road and highway sign gantry structures
- Bridge and flyover railing and support systems
- Railway station roofing frameworks
- Telecom and power transmission structure supports
- Solar module mounting structures and frames
Industrial & Process Piping:
- Compressed air distribution lines
- Steam and process fluid conveyance (with appropriate coatings)
- Equipment frames, machine guards, and conveyor supports
- Belt conveyor idler frames (IS 3601 / IS 9295 compliant)
- Fire protection and sprinkler lines (Class C, with red oxide coating)
Agriculture & Irrigation:
- Greenhouse and polyhouse framework structures
- Shade net and net house support systems
- Farm equipment frames and supports
General Engineering:
- Cable conduit and electrical line protection pipes
- Low-pressure fluid and gas conveyance lines (with appropriate treatment)
- Custom fabrication and general engineering projects
Applicable Standards & Certifications
| Standard | Description |
|---|---|
| IS 1239 Part 1 (2004) | Mild Steel Tubes – Dimensions and Requirements (15 mm to 150 mm NB) |
| IS 3589 (2001) | Steel Pipes for Water & Sewage (168.3 mm OD and above) |
| IS 1161 | Steel Tubes for Structural Purposes |
| IS 4923 | Hollow Steel Sections for Structural Use |
| IS 3601 | Steel Tubes for Mechanical and General Engineering Purposes |
| IS 9295 | Steel Tubes for Idlers Used in Belt Conveyors |
| BS 1387 / EN 10255 | British / European equivalent for medium-pressure steel tubes |
| ASTM A53 | American standard for ERW and seamless MS pipes |
| EN 10219 / EN 39 | European structural hollow section standards |
| AS 1163 | Australian standard for cold-formed structural steel hollow sections |
All pipes are supplied with ISI / BIS certification marks and Mill Test Certificates available on request per EN 10204 3.1.
How to Choose the Right Class
| Use Case | Recommended Class |
|---|---|
| Light structural framing, fencing, conduit, low-load fabrication | Class A – Light |
| General fabrication, scaffolding, industrial structures, gas lines | Class B – Medium (Most Popular) |
| High-load structural, embedded / concealed piping, heavy fabrication | Class C – Heavy |
| Large diameter water mains, sewage, industrial pipelines (6" NB+) | IS 3589 – Grade FE 330 / FE 410 |
Available Brands
We stock MS Black Pipes from India's leading ISI-certified manufacturers, giving you the flexibility to choose a brand that best suits your project requirements, approval list, or regional preference:
| Brand | Known For |
|---|---|
| Bansal Pipes | Widely distributed, consistent quality, popular across North and East India |
| Jindal (Jindal Star / Jindal Hissar) | Six decades of ERW pipe manufacturing, pan-India distribution, export-grade quality |
| Nezone | Northeast India's leading pipe manufacturer, strong presence in Eastern and Central India |
All brands stocked by us are BIS / ISI certified and conform to IS 1239 and IS 3589 as applicable. Mill Test Certificates available on request.
Frequently Asked Questions (FAQs)
Q: What is an MS Black Pipe and why is it called "black"? MS Black Pipes are mild steel pipes in their natural mill finish state — without any galvanizing or surface treatment. They appear dark or "black" due to the iron oxide (mill scale) layer formed during the hot rolling of the base steel. They are also commonly referred to as MS ERW Black Pipes or simply Black Steel Pipes.
Q: Can MS Black Pipes be used for water supply? MS Black Pipes are not recommended for direct potable water supply without a protective internal coating, as they are susceptible to corrosion when in contact with water. For water supply applications, GI Pipes (hot-dip galvanized) are the preferred choice. MS pipes can be used for water conveyance in industrial settings when appropriate internal linings or coatings are applied.
Q: What is the difference between Class A, B, and C MS pipes? The classes refer to wall thickness. Class A (Light) has the thinnest walls and is used for low-load, non-pressure applications like fencing and conduit. Class B (Medium) is the most widely used for general fabrication, structural, and scaffolding work. Class C (Heavy) has the thickest walls and is ideal for high-load structural, embedded, or industrial pressure applications.
Q: What coatings are available for MS Black Pipes? MS Black Pipes can be supplied with anti-corrosive oil (standard mill finish), black varnish, red oxide primer, epoxy paint, zinc chromate coating, and 3LPE (Three Layer Polyethylene) cladding for underground or aggressive environments.
Q: What is the standard pipe length for MS Black Pipes? Standard lengths are 4 m and 6 m. Pipes up to 12 m are available on request. Custom cut-to-length is also available.
Q: What is the difference between IS 1239 and IS 3589? IS 1239 covers pipes from ½" NB (15 mm) to 6" NB (150 mm) for general structural and engineering applications. IS 3589 covers larger diameter pipes (168.3 mm OD and above) for municipal water mains, sewage systems, and large industrial pipelines. IS 3589 Grade FE 410 also offers superior mechanical properties for demanding applications.
Q: What is the HSN Code for MS Black Pipes? The HSN Code for MS Black Pipes (welded steel tubes and pipes) is 7306.
MS Black Pipes — ISI Certified. Precision Engineered. The Backbone of India's Infrastructure.
Key Features
- Available with Protective Coatings
- Cost-Effective
- Dimensional Precision
- Easy to Cut, Drill & Thread
- High Tensile Strength
- ISI Marked
- Outstanding Weldability
- Versatile End Options
- Wide Size Range
