A mild steel box section (also called hollow structural section, HSS, or box girder) is a type of steel profile with a hollow, rectangular or square cross-section. It is widely used in construction and engineering due to its high strength-to-weight ratio, torsional resistance, and aesthetic appeal.
Key Features of Steel Box Sections
- Shape – Typically square or rectangular, but can also be circular (though circular sections are usually called "tubes").
- Material – Made from carbon steel, stainless steel, or weathering steel.
- Manufacturing – Produced by cold-forming or hot-rolling steel sheets into hollow sections.
- Weldability – Can be easily welded, bolted, or fabricated into structures.
- Surface Finish – Available in raw (mill finish), galvanized, or painted coatings for corrosion resistance.
Steel hollow box section Advantages
✔ High Strength & Stiffness – Resists bending and torsional forces better than open sections (like I-beams).
✔ Lightweight – Hollow design reduces weight while maintaining strength.
✔ Aesthetic Appeal – Clean, modern look for architectural applications.
✔ Versatility – Used in buildings, bridges, machinery, and vehicle frames.
✔ Efficient Material Use – Requires less steel compared to solid sections for similar strength.
ms mild Steel Box Sections Sizes & Standards
| Square Steel Box Section | Rectangular Steel Box Section | Wall Thickness |
| mm | mm | mm |
| 20*20 25*25 30*30 | 20*40 30*40 | 1.7-2.75 |
| 40*40 50*50 | 30*50 25*50 30*60 40*60 | 1.2-4.75 |
| 60*60 | 50*70 40*80 40*50 | 1.2-5.75 |
| 70*70 | 60*80 50*80 100*40 | 1.5-5.75 |
| 80*80 75*75 90*90 | 60*100 50*100 120*60 100*80 | 1.5-8.0 |
| 100*100 | 120*80 | 1.7-8.0 |
| 120*120 | 160*80 150*100 140*80 | 2.5-10.0 |
| 140*140 150*150 | 100*180 200*100 | 2.5-10.0 |
| 160*160 180*180 | 200*150 | 3.5-12.0 |
| 200*200 | 250*150 | 3.5-12.0 |
| 250*250 280*280 | 250*200 300*200 | 4.5-15.75 |
| 300*300 | 350*200 350*250 400*200 | 4.5-15.75 |
| 350*350 | 350*300 450*250 400*300 500*200 | 4.5-15.75 |
| 400*400 500*500 | 450*300 450*200 400*350 400*250 500*250 500*300 400*600 | 4.5-20.0 |
Complies with standards like ASTM A500, EN 10219, JIS3466, GB/T 6728, or EN10210
Common Applications
- Construction – Columns, beams, and trusses in buildings.
- Bridges – Box girders for long-span bridges.
- Automotive & Transport – Chassis and roll cages.
- Industrial Structures – Support frames, conveyor systems.
- Architectural Uses – Handrails, canopies, and exposed structural elements.
Square hollow or metal box section are commonly used in many commercial and industrial applications. This product has particularly good strength and weldability. We have the largest range of square erw box section steel available in stock, with length, width, and thickness to choose from. However, if you do not see the required specifications, please contact us.We also offer various circular and rectangular box section, as well as some testing certificates
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