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Hot Rolled Square Tubes
ASTM A500 Grade B hot rolled steel square tube. Features a 46,000 PSI yield strength and excellent weldability. Stocked in sizes like 1/2" and 3/4" with a 0.065" wall.
About Hot Rolled Square Tubes
Hot rolled steel square tubes offer excellent weldability and a yield strength of 46,000 PSI per ASTM A500 Grade B. Ideal for structural frames, supports, and general fabrication projects.
Quick Facts
- Material: Carbon Steel, A500 Grade B
- ASTM Standard: A500
- Available Sizes: Sides from 1/2" to 3/4"; Wall thickness 0.065" (16GA)
- Location: Los Angeles warehouse
- Services: Custom size, same-day pickup
Overview
Hot rolled square tube is formed from steel that has been processed at high temperatures, resulting in a product with a scaled surface finish and slightly rounded corners. This manufacturing method makes it a cost-effective choice for structural applications where precise tolerances and a smooth finish are not primary requirements. Its composition provides a durable material with good formability and excellent weldability, making it easy to fabricate into complex structures.
Often referred to as HSS (Hollow Structural Section), this tubing provides a high strength-to-weight ratio, essential for building rigid yet lightweight frames, supports, and machine bases. Unlike cold rolled tubing, its surface is better suited for painting after proper preparation. The material’s inherent strength and versatility make it a foundational component in general fabrication, construction, and automotive manufacturing for components that do not require an aesthetic finish.
Technical Specifications
⚠️ Reference Data Only: Values shown are typical industry standards and may vary by manufacturer, lot, and heat treatment. For critical applications, please contact us to verify specifications or request a Mill Test Report (MTR).
Mechanical Properties (A500 Grade B)
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 58,000 | PSI |
| Yield Strength | 46,000 | PSI |
| Elongation | 23 | % |
Applicable Standards
- ASTM A500: Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes
Common Applications
- Trailer Manufacturing: Trailer frames, tongues, and support jacks - Durability and load-bearing capacity.
- Fencing & Gates: Gate frames, fence posts, and security enclosures - Weldability and rigidity.
- Construction: Structural supports, building frames, and columns - High strength-to-weight ratio.
- Automotive: Roll cages, chassis components, and equipment racks - Good impact resistance.
- Industrial Equipment: Machine bases, conveyor frames, and support structures - Cost-effective strength.
- Agricultural: Equipment frames, implement components, and stall construction - Robust and easily fabricated.
- Furniture: Industrial-style table legs, shelving units, and frames - Aesthetic and structural integrity.
- General Fabrication: Brackets, mounts, and custom fixtures - Easy to cut, drill, and weld.
Working with Hot Rolled Square Tubes
Machining
Hot rolled square tube is easily machinable using standard methods. Due to the scaled surface, initial cuts may wear tools faster. Using appropriate speeds, feeds, and coolant will yield good results for drilling, cutting, and milling operations.
Welding
This material exhibits excellent weldability using common techniques, including MIG, TIG, and stick welding. The mill scale on the surface should be removed by grinding or sanding prior to welding to ensure a strong, clean weld bead with good penetration.
Finishing
The hot rolled surface has a dark, scaly finish that is not ideal for direct painting. For a lasting finish, the surface should be prepared by sandblasting, grinding, or chemical cleaning to remove mill scale before applying primer and paint.
Related Products
Frequently Asked Questions
Q: What is the difference between A500 and A513 square tubing?
A: A500 is a structural tubing specification with higher minimum strength requirements (46,000 PSI yield) and is used for construction and frames. A513 is mechanical tubing with tighter tolerances on dimensions and wall thickness, but lower strength requirements, making it better for precision machine parts.
Q: Do I need to clean hot rolled square tube before painting?
A: Yes, it is critical. The dark mill scale on the surface will flake off over time, taking the paint with it. The surface must be cleaned by grinding, sandblasting, or using a chemical rust remover before priming and painting for proper adhesion.
Q: Can hot rolled square tube be used for outdoor applications?
A: It can be used outdoors if it is properly protected from corrosion. The bare steel will rust quickly when exposed to moisture. It must be thoroughly cleaned and then painted, powder-coated, or galvanized to provide a protective barrier against the elements.
Stock & Custom Sizes
Available sizes: 1/2"×1/2" to 3/4"×3/4". Wall thicknesses: 0.065" (16GA). Standard lengths: 20 ft. Custom size available.
Same-day cutting and Los Angeles pickup available.
View Sizes & PricingNeed Hot Rolled Square Tubes? Contact Bobco Metals for availability and Los Angeles pickup.
Request a Quote Ask an Expert| Item Size & Description | Weight (lbs.)/Ft | Click! Arrow to Select Size | Qty | Price | Actions |
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| 1.048 |
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0.495
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0.606
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0.623
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0.827
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1.035
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1.048
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