Hot-Rolled
I Beam
ISMB Sections
Structural I Beam sections for warehouses, industrial sheds, mezzanine floors, heavy fabrication, and long-span construction where load capacity and dimensional accuracy are non-negotiable.
I Beam ISMB — Up Close
Hot-rolled I Beam sections with consistent flange width, web depth, and mill-standard finish for structural and fabrication work.
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04What Is an
I Beam?
An I Beam — also called an I-section, rolled steel joist (RSJ), or ISMB in Indian standards — is a hot-rolled structural steel section whose cross-section resembles the capital letter "I". It consists of two horizontal plates called flanges connected by a vertical plate called the web. The angle connecting the web to the flanges is the fillet.
In Indian construction, the ISMB designation (Indian Standard Medium Weight Beam) refers specifically to I Beam sections produced to IS:808 dimensional standards. Unlike an H Beam (ISHB), where the web depth and flange width are roughly equal, an ISMB has a web that is significantly deeper than its flange is wide — making it ideal for bending resistance along horizontal spans rather than axial column loads.
The design concentrates steel at the top and bottom flanges, where bending stresses are highest, while the web carries shear. This gives I Beam sections an outstanding strength-to-weight ratio for horizontal spans — which is why they are the standard choice for warehouse rafters, mezzanine floor beams, overhead crane girder rails, and bridge girders.
ISMB sections are readily weldable, drillable, and bolted using standard fabrication equipment. They are typically supplied in 6 metre and 12 metre standard lengths and conform to IS:2062 Grade A material specification.
I Beam Weight Calculator
Select ISMB section, quantity, and length to get instant weight in kg and truck planning for your project.
Stocked for Structural Contractors & Industrial Buyers
Primary mill I Beam and commercial grade supply backed by weight verification, source transparency, and mill test certificates.
Two Supply Tiers.
Choose by Specification, Not Guesswork.
Primary grade where test certificates and strict mill sourcing matter. Commercial grade where cost efficiency matters without compromising dimensional reliability.
Vizag Steel
- Government projects and PWD tenders
- Industrial warehouses and large-span sheds
- Bridges, flyovers, and heavy civil structures
- Projects where mill test certificate is mandatory
- Consultant or engineer-specified branded material
Rolling Mills
- Industrial shed columns and roof support beams
- Mezzanine floor framing and platforms
- Agricultural storage structures
- Non-certified general fabrication
- Projects where TC is not mandated
I Beam Size Chart & Weight Chart in kg
Standard ISMB section sizes per IS:808 — I Beam weight per metre and per foot for accurate BOQ estimation and load planning.
| Section | Depth × Flange (mm) | Flange Thk | Web Thk | kg/m | kg/ft | Use |
|---|---|---|---|---|---|---|
| ISMB 100 | 100 × 50 | 7.0 mm | 4.7 mm | 8.90 | 2.71 | Light frames, supports |
| ISMB 125 | 125 × 70 | 8.0 mm | 5.0 mm | 13.30 | 4.05 | Sheds, small beams |
| ISMB 150 | 150 × 75 | 8.0 mm | 5.0 mm | 15.00 | 4.57 | Beams, lintels |
| ISMB 175 | 175 × 85 | 9.0 mm | 5.8 mm | 19.60 | 5.97 | Platforms, mezzanine |
| ISMB 200 | 200 × 100 | 10.0 mm | 5.7 mm | 24.20 | 7.38 | Industrial structures |
| Section | Depth × Flange (mm) | Flange Thk | Web Thk | kg/m | kg/ft | Use |
|---|---|---|---|---|---|---|
| ISMB 225 | 225 × 110 | 11.0 mm | 6.5 mm | 31.10 | 9.48 | Heavy framing |
| ISMB 250 | 250 × 125 | 12.5 mm | 6.9 mm | 37.30 | 11.37 | Longer spans |
| ISMB 300 | 300 × 140 | 13.5 mm | 7.7 mm | 46.00 | 14.02 | Heavy loads |
| ISMB 350 | 350 × 140 | 14.2 mm | 8.1 mm | 52.40 | 15.97 | Large sheds |
| ISMB 400 | 400 × 140 | 16.0 mm | 8.9 mm | 61.60 | 18.78 | Warehouses, columns |
| Section | Depth × Flange (mm) | Flange Thk | Web Thk | kg/m | kg/ft | Grade | Use |
|---|---|---|---|---|---|---|---|
| ISMB 450 | 450 × 150 | 17.4 mm | 9.4 mm | 72.40 | 22.07 | Primary | High load beams |
| ISMB 500 | 500 × 180 | 17.2 mm | 10.2 mm | 86.90 | 26.49 | Primary | Heavy structures |
| ISMB 600 | 600 × 210 | 20.3 mm | 12.0 mm | 123.00 | 37.49 | Primary | Major span / bridge |
Standard lengths: 6 metres and 12 metres · Weights per IS:808 · Actual may vary within ±2.5% rolling tolerance · Mill TC available for primary grade
Rolling Tolerances & Chemical Composition
Permissible deviations for ISMB sections and IS:2062 chemical limits for Grade A material.
| Parameter | Tolerance |
|---|---|
| Depth — up to 200mm | ± 2.0 mm |
| Depth — 200 to 400mm | ± 3.0 mm |
| Depth — above 400mm | ± 4.0 mm |
| Flange width — up to 100mm | ± 2.0 mm |
| Flange width — above 100mm | ± 3.0 mm |
| Sectional weight | ± 2.5% |
| Fixed length supply | + 100 mm |
| Camber (straightness) | 0.1% of length |
| Web thickness | ± 0.5 mm (up to 6mm) / ± 1.0 mm (above) |
| Element | Max. % (Grade A) |
|---|---|
| Carbon (C) | 0.23 |
| Manganese (Mn) | 1.50 |
| Sulphur (S) | 0.050 |
| Phosphorus (P) | 0.050 |
| Silicon (Si) | 0.40 |
| Carbon Equivalent (CE) | 0.42 |
| Yield Strength Min. | 250 N/mm² |
| Tensile Strength | 410–540 N/mm² |
| Elongation Min. | 23% |
Why Structural Buyers in Central India Buy I Beam from Us
Not just supply. Controlled sourcing, weight verification, and practical support for buyers who need to get the job done right.
What Gets Built with I Beam
FAQ — I Beam Size Chart, Weight & Price
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Bulk
I Beam Quote?
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- Share BOQ or I Beam size list on WhatsApp
- Primary or commercial grade recommendation
- I Beam weight & dispatch planning support
- Mill TC available for SAIL / RINL primary supply