Red Brick calculation program
Rectangular steel pipe (or square tube steel), conforming to Thai Industrial Standards (TIS), is square-shaped, strong, and durable.
Flat steel box or Rectangular Steel Tube is Cold rolled steel It is similar in appearance to square steel tubing, but has a rectangular cross-section (with unequal width and height), resulting in superior bending moment resistance in the depth direction. This makes it suitable for applications requiring space efficiency in the horizontal plane but high vertical strength.
Why choose flat steel box sections from AY Contento?
- Genuine Thai Industrial Standard (TIS): All steel bars are certified to meet standards. TIS 107-2561 (Carbon steel pipes for general structural applications) Guaranteed to meet full specifications in terms of thickness and weight.
- There are 2 skin options to choose from:
- Black steel square tubes (Black Steel Tube): Suitable for general structural work that requires painting with rust-proof paint.
- Galvanized flat steel box sections (Galvanized Rectangular Tube): Galvanized coating provides rust protection and is suitable for exposed surfaces, outdoor applications, or areas near the sea.
- Custom sizing service: We offer steel cutting services to your required length, with delivery to project sites nationwide.
Advantages of flat steel pipes in construction.
- Economical structure: The rectangular shape (Moment of Inertia) provides excellent resistance to bending forces in the vertical axis, allowing for the reduction of the number of columns or beams in some areas.
- Clean work area: It is a dry construction process, reducing dust and mess compared to concrete work.
- Modern design: The smooth, sharp surface of the steel is ideal for modern architecture that emphasizes showcasing the structural framework.
Applications
- Door and window work: It is commonly used to make door and window frames (as a substitute for wood).
- Roofing work: Used as a roof purlin, replacing C-channel steel, in projects requiring a neat, seamless finish without open grooves.
- Structural work: Crossbeams, floor joists, fence posts
- Furniture work: Conference table legs, bed frames, industrial shelving.
Table of Flat Steel Box Section Sizes and Average Prices (Last Updated 2026)
| Size (inches) | Size (mm) | Thickness (mm) | Usage recommendations | Product price |
| 2" x 1"" | 50 x 25 | 1.2 - 3.2 | Furniture, lattice fences, wrought iron. | 160 - 350 baht |
| 3" x 1.5"" | 75 x 38 | 1.2 - 3.2 | Door frames, window frames, lightweight wall frames. | [Inquire about the price] |
| 4" x 2"" | 100 x 50 | 1.6 - 4.5 | Popular Roof structure, purlins, rafters | 470 - 980 baht |
| 5" x 2"" | 125 x 50 | 2.3 - 4.5 | Structural beams, medium load bearing. | [Inquire about the price] |
| 5" x 3"" | 125 x 75 | 2.3 - 6.0 | Garage pillars, main structure. | 820 - 1,300 baht |
| 6" x 2"" | 150 x 50 | 2.3 - 6.0 | Wide-span beams, advertising sign structures. | 670 - 1,240 baht |
| 6" x 3"" | 150 x 75 | 2.3 - 6.0 | Building columns, replacement of wide flange (in some areas). | 1,300 - 1,750 baht |
| 8" x 4"" | 200 x 100 | 3.2 - 9.0 | Heavy-duty structures, high-rise buildings | 2,800 - 3,250 baht |
Frequently Asked Questions (FAQ)
It's better in terms of cleanliness and durability. Because it's a closed pipe, birds or rodents can't nest inside, and it can withstand torsional forces better. However... C-shaped steel It will be more cost-effective and lighter, depending on the budget and project design.
Yes, that's right. Back in the day, mechanics commonly called it that. "Matchbox steel" Because the cross-section resembles a matchbox, which generally refers to the size. 2x1 inch (50 x 25 mm) ครับ
""Looking for flat steel box sections for window frames or roof structures?""
Order quality steel, get your work done quickly. Trust AY Contento.
🟢 Line: @aycon
📞 Tel: 083-0243351
🚚 Delivery service: Trucks offer delivery right to your location.
Request for quotation
Related articles
- Galvanized steel box: a good value product that you shouldn't overlook.
- Price of square steel 2024, today's price + how to buy (with table)
- Square steel is cheap, easy to find, and suitable for DIY work.
- 1x1 square steel, economical price, good value, suitable for every budget.
- What is the difference between square steel pipe and square tube? Which one should I choose?
- 5 reasons to choose “4×2 square steel” for your home structure
Denphong –
Beautiful steel, fast delivery, recommended.
Weera –
Beautiful steel, good price, fast delivery.