ISMB 450 Weight, Dimensions and IS 808 Properties
ISMB 450 weighs 72.4 kg per metre as per IS 808:1989.
- One 6-metre length weighs 434.4 kg · one 12-metre length weighs 868.8 kg
- Overall depth 450 mm · flange width 150 mm · web thickness 9.4 mm
- Cross-sectional area 9,220 mm² · Ixx = 30,390.7 cm⁴
ISMB 450 is a heavy structural beam per IS 808:1989, used for long-span industrial floor beams, heavy crane runway girders, and primary beams in multi-storey steel frames. Its wider 150 mm flange compared to ISMB 400 improves lateral stability for longer unbraced lengths.
ISMB 450 Weight Calculator
Enter the total length in metres to calculate weight.
ISMB 450 — Weight Calculator
IS 808:1989 Dimensions and Sectional Properties
| Property | Symbol | Unit | Value |
|---|---|---|---|
| Overall depth | D | mm | 450 |
| Flange width | B | mm | 150 |
| Web thickness | tw | mm | 9.4 |
| Flange thickness | tf | mm | 17.4 |
| Cross-sectional area | A | mm² | 9,220 |
| Mass per metre | — | kg/m | 72.4 |
| Moment of inertia (x–x) | Ixx | cm⁴ | 30,390.7 |
| Moment of inertia (y–y) | Iyy | cm⁴ | 838.5 |
| Elastic section modulus (x–x) | Zxx | cm³ | 1,350.7 |
| Elastic section modulus (y–y) | Zyy | cm³ | 111.8 |
| Radius of gyration (x–x) | rxx | cm | 18.16 |
| Radius of gyration (y–y) | ryy | cm | 3.01 |
Dimensions and properties as per IS 808:1989 (reaffirmed 2021). Mass tolerance: ±2.5% per piece per IS 808.
Common Applications of ISMB 450
ISMB 450 is used for heavy crane runway beams, transfer girders in multi-storey frames, and long-span industrial floor structures. Its increased flange width of 150 mm over the 300–400 series gives better performance where lateral-torsional buckling governs design. SAIL Bhilai and Tata Steel supply ISMB 450 in IS 2062 E300 and E350 grades.
Worked Example
A heavy engineering plant in Pune requires 4 crane runway girders of ISMB 450 each 10.0 m long for a 20-tonne EOT crane. Total length = 4 × 10.0 = 40 m. Weight = 40 × 72.4 = 2,896 kg (2.896 tonnes). At ₹58,000 per tonne (May 2026), estimated material cost is approximately ₹1,67,970.
Related ISMB Sections
Compare with adjacent sizes: ISMB 400 (61.6 kg/m) · ISMB 500 (86.9 kg/m). For all ISMB sizes see the Section Reference Library →
Frequently Asked Questions
What is the weight of ISMB 450 per metre?
ISMB 450 weighs 72.4 kg per metre as specified in IS 808:1989. For a standard 6-metre length, the total weight is 434.4 kg. For a 12-metre length, total weight is 868.8 kg.
ISMB 450 ka weight per meter kitna hota hai?
IS 808:1989 standard ke according, ISMB 450 ka weight 72.4 kg/m hota hai. 6 metre ki ek length ka total weight 434.4 kg hoga. Zyada accurate calculation ke liye upar diya gaya calculator use karein.
What are the dimensions of ISMB 450?
ISMB 450 per IS 808:1989 has an overall depth of 450 mm, flange width of 150 mm, web thickness of 9.4 mm, and flange thickness of 17.4 mm. The cross-sectional area is 9,220 mm².
Need weight for a different section type? Our free Metal Weight Calculator covers all IS 808 sections, pipes, bars, and hollow sections.
Try the Free Metal Weight Calculator →