A500 A513 Carbon Steel Square Tubing 3in x 0.12in x 36in - Structural

In this review the reviewer looks at the A500/A513 carbon steel square tubing to determine whether it suits small structural projects and metalworking shops. The bottom line is simple: this 3in by 0.12in wall, 36in length tube is a solid choice when you need an affordable, weldable piece of steel that meets common structural specifications. For builders, fabricators, and hobbyists who value straightforward strength and easy welding, this tubing delivers dependable performance without unnecessary extras.

Key Features

• Material Strength: A500/A513 carbon steel provides good structural strength suitable for light framing and support applications.
• Weldability: The steel is easy to weld, which helps speed up fabrication and repair work in shops and on site.
• Standard Size: The 3in height and 0.12in wall in a 36in length make it convenient for common projects and reduce the need for cutting long stock.
• Specification Compliance: Meets ASTM-A513 and has A500 availability, offering reassurance for applications that reference these standards.
• Cost Effectiveness: As a commonly used tubing in North America, it tends to be lower cost compared with specialty alloys, improving project budgets.

Who It's For

This tubing is best for fabricators, metalworkers, and contractors who need a reliable piece of structural steel for framing, jigs, racks, or fixtures. It also fits hobbyists building carts, gates, or custom furniture where weldability and predictable strength are important.

Those who need corrosion-resistant or decorative finished tubing should look elsewhere or plan for a surface treatment, since some customers reported mixed results on rust resistance. Also, if you require stainless or specialty alloy properties, this standard carbon steel will not meet those needs.

Pros & Cons

Pros

• Good strength-to-cost balance for structural and small-scale industrial use.
• Easy to weld and work with common shop tools for quick fabrication.
• Standard dimensions (3in x 0.12in x 36in) reduce the need for additional cutting for many projects.
• Meets ASTM-A513 and offers A500 availability for applications referencing those specs.

Cons

• Not inherently corrosion resistant; some customers noted rust unless the steel is treated or painted.
• Limited to carbon steel properties, so not suitable where stainless or weathering alloys are required.

Specifications

Our Verdict

The A500/A513 3in x 0.12in x 36in square tubing is a practical, value-oriented choice for anyone needing straightforward structural steel that is easy to weld and work with. It is especially good for fabricators and hobbyists on a budget, though buyers should plan for surface protection if resistance to corrosion is important.

Frequently Asked Questions

Is this tubing weldable?
Yes. A500/A513 carbon steel is noted for good weldability and is suitable for common welding processes.

Does it meet industry standards?
Yes. The product meets ASTM-A513 and A500 is available on request for applications requiring that spec.

Will it rust outdoors?
Carbon steel is not stainless; some customers reported rust unless the piece is painted or otherwise treated for corrosion resistance.