Steel Tube

Kloeckner Metals is proud to supply round, square, and rectangular steel tube in nationwide across our network of 40+ branches.

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More Details About Each Steel Tube Grade

  • A513

    ASTM A-513 Type 1 is a low carbon steel. It shows tighter dimensional tolerances on outer diameter, wall thickness, and length than A500, and is more easily bended. It is one of the highest value steel tubing available.

    It’s routinely stocked in the following formats:

    • Hot Rolled Square Mechanical Carbon Steel
    • Rectangular Structural Tubing
    • Hot Rolled Round Mechanical Carbon Steel


  • A500

    A500 is available in two grades, B and C. GR B is a cold formed welded and seamless carbon steel available in round, square, and rectangular structural tubing for welded, riveted, or bolted construction. It shows excellent weldability and good machinability. Common applications include: bridges and buildings, and for general structural purposes.

    A500 GR C is available in square and rectangular structural tubing. Similar to grade B in many ways, it distinguishes itself with higher yield and tensile strengths.

  • AISI-1020

    AISI-1020 is used for round structural tubing. It is a high strength carbon steel with good machinability, weldability, and high ductility.

Learn More About Each Steel Tube Grade

General Info About Steel Tube

This widely popular hollow steel product is most often used for mechanical or structural purposes across industries. It is available in round, square, and rectangular shapes in varying thicknesses and lengths.

Frequently Asked Questions

  • What is the difference between carbon steel tube and stainless steel tube?


    The main difference between these two products is their chemical composition. Carbon steel has higher carbon content than stainless steel and a lower alloy content. As a result, carbon steel is more susceptible to rust when exposed to moisture. In addition to a significantly lower carbon content, stainless steel has a much higher chromium content. The added chromium protects against corrosion and oxidation. Read our blog post on when to use stainless steel vs carbon steel to learn more.

  • What is typical steel tube sizing?


    They are measured in their outer dimensions, gauge/wall thicknesses, and length. Typical sizes include 11 gauge, 1/4”, 3/8” and 5/8” at the 20′, 24′, 40′ and 48′ lengths.

  • What is rectangle steel tube?


    It is a hollow steel product in the shape of a rectangle.

  • Why is rectangle steel tube popular?


    High demand in growing industries like construction, architecture, and automotive make this a popular steel product. It is designed for structural applications and manufacturing industries because its shape offers greater strength and rigidity than other tubes.

  • What are typical square steel tube sizes?


    Typical square sizes include: 1/2″, 3/4″, 5/8″,  7/8″ and 1″ in 11, 14, 16, 18, and 20 gauges. They can be easily cut to custom lengths.

  • Why is round steel tube common?


    Because of its excellent strength and durability, this product is seen widely across industries — from construction and architecture to aerospace manufacturing. It is also easy to cut, bend, and form.

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Additional Product Types

Kloeckner stocks the largest variety of products for the metals industry with over 200,000 available across our 50+ branches, all of them located close to the industries they serve to reduce warehouse and freight costs. See a selection of our other products below.
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