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Square Tube
Quick Overview

  • Similar to rectangular steel tubes, square tubes undergo the same process of either being welded or seamless.

  • Square steel tubes are able to withstand extreme temperatures and pressures.

  • Square steel tubes are generally used for maintenance and structural purposes.

  • Wondering where to buy good quality Square Tube? Camasteel is here! Get a quote from us and purchase great and cost-effective square tubes from China

Availability: In stock


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Q195, Q345
Application: Carbon Structural Steel, Construction, Building
Standard: ASTM, GB, JIS, DIN
Lengths: 1-12M
Widths: 0.75-32mm
Technique: Electronic Resistance Welded (ERW), Electronic Fusion Welded (EFW), Double Submerged Arc Welded (DSAW)
Surface Treatment: Galvanized, Black painted varnish coating, oiled
Ends: Plain, Beveled, Thread, and Socket

Square Steel Tube 

Square steel tube (tubing) can be used in both domestic and industrial settings because of their ability to withstand extreme temperatures, pressure, and natural destructive elements. In a domestic scenario, these steel tubes can be used to transport gasses and liquids. 

Characteristics of Square Steel Tubes:

  • Ability to withstand extreme temperatures, pressure, and natural destructive elements.

  • They have uniformity in wall thickness and concentricity.

  • Square steel tubes are stronger but more costly than rectangular steel tubes.

  • Square steel tubes can be either welded or seamless.

How Square Tubes are Manufactured?

Square steel tubes begin their life as iron ores that are melted into a liquid substance that are cooled into ingots. These ingots are flattened through steel rollers that make them into slabs of steel with rectangular cross-sections and cut into the necessary shape. These welded pipes that were formed from a roller system undergo an electric-resistance welding process which forces and binds the slabs together to produce the tubing.

square tube

What are Some Specific Use of Square Steel Tubes?

Square tubes are generally used for maintenance and structural purposes. Some specific applications of square steel tubes include machine parts, guides, and supports, safety and deck rails, sign posts, athletic equipment.

What are the Benefits of Square Steel Tubes?

  • Uniformity: square tubes contain uniform wall thickness and concentricity.

  • Strength: Cold forming allows square tubes to be able to withstand extreme temperatures, pressures, and destructive elements.

  • Cost-Effectiveness: Square tubes undergo less processing than other types of mechanical tubing, so they have cost advantages for less-demanding applications.

  • Wide Range in Sizes: Square tubes are available in broad range of OD and wall thickness dimensions. This makes them suitable for various applications and needs.

How to Choose Between Square Steel Tube and Rectangular Steel Tube?

When cons dering rectangular or square tubes, it is good to know that square tubes are stronger but weigh and cost more than their rectangular counterpart. 

How Are Steel Tubes Sizes Measured?

Regardless of its material, steel tube is measured by its outside diameter (OD). In other words, the dimensions provided for steel tube refer to its actual outside diameter.

square tube

What are the differences Between Steel Tubes and Steel Pipes? 

Though steel pipes and steel tubes look similar, they  do not have the same applications and they vary in sizing. They both have a hollow cylindrical shape but that is where the similarities end. 

For example, steel pipes’ diameters are calculated using the inside diameter whereas steel tubes’ are calculated using the outside diameter. Another distinguishing factor is the shape of the inside where steel pipes only have round sections and tubes can be round, square, and rectangular. 

Differences in Steel Pipes’ and Steel Tubes’ Applications

 Steel pipes usually cover larger applications than steel tubes do. Steel pipes are typically used for transporting or dispensing liquids and gases, so it is important to know the capacity and tolerance of the pipe. Steel tubes on the other hand are used in manufacturing and for structural purposes.

Which is Stronger: Steel Pipe or Steel Tube?

Steel tubes are significantly stronger than steel pipes. Steel tubes perform much better in applications that require strength.

What is the Strongest Metal Tube?

The answer is steel. Steel is one of the strongest and most durable metals for tubes. It provides excellent heat resistance, long durability and high corrosion resistance because it is often alloyed with various kinds of metals. That’s why Camasteel’s square steel tube will be the best choice for you!

square tube

What Are Square Tubes Used For?  

Square tube is quite useful and is applied for several domestic and industrial uses. Due to their unique ability and strength they can withstand extreme pressure and temperature, they are applied for use in the following; 

  • It can be used in the manufacturing of construction equipment which includes steam rollers, bulldozers, and cranes. 

  • It is used as a support for buildings, bridges, and towers. 

  • It can be used to make bases and brackets for solar mounts and panels. 

  • It is used as a railing for stairs in buildings, and as a fence and entrance gate. 

  • It is also used in the manufacture of trailers and trucks, railcar bases, and frames. 

How Are Steel Tubes Sizes Measured? 

Steel Tube sizes are often measured by the outside diameter (O.D.) and are specified in inches or fractions of an inch. 

What Is The Strongest Metal Tube? 

Steel Tube is the strongest metal tube there is. It is highly durable. It provides heat resistance. It is often alloyed with other metals to increase its corrosion-resistance and durability. 

square tube

Is The Square Tube Stronger Than Round? 

No, a Square tube is not stronger than a round tube. A round tube is stronger and more formable. It's resistant to twisting and bending. 

How Strong Is the Square Tube? 

The average strength of a square tube is about 36,000 psi under maximum yield stress. 

Is Square Tubing Cheaper Than Pipe?  

No, a square tube is not cheaper than a pipe. The production cost of square pipe is easier and costs less. The manufacturing process of the tube requires more energy, labor, and materials. Pipes are often manufactured in bulk which causes a cut in the cost of pipes. 

Which Is Stronger, Square Or Rectangular Tubing? 

A rectangular Tube is always stronger than a square tube. Rectangular tubing can withstand any load at any orientation. 

How Do You Bend Square Tubing? 

You can easily bend a square tubing through the use of a bender. However, in the absence of a bender, you can just cut part way through the square tube at one end. Then cut out a triangle at the angle you wish to bend. Then you can easily bend the tube, and weld the joint afterwards. This might be a little tricky on small radiuses.

square tube 

What Lengths Does Square Tube Come In?  

The lengths of the square tube can differ. It normally ranges between 20 feet to 40 feet.  

What Is Steel Tube Used For? 

Steel Tube is applied for use in various industries which include; 

  • Industrial 

Steel Tube is used for various industrial applications, especially for the transportation of gases, water, and liquid waste. Steel tubes are used commonly as a component of industrial machinery, such as hydraulic lifts, conveyor belts, mills, and several other machines. There are several home appliances that steel tubes are used to manufacture. 

  • Medical 

Steel tubes are applied both in patient assistance and equipment in the medical world. Steel tubes are used in the manufacture of surgical tools and for several implants such as bones. Stethoscopes are also made from a particular type of steel tube. 

  • Military and Aerospace 

Steel tubes are often applied in the military for weapon components and vehicles due to their ability to withstand extreme conditions. Its strength is one of the major reasons It is applied in aerospace since the structures require more strength in outer space than on earth. Steel tubes are usually present in landing gear, motor shafts, and exhaust stacks.

  • Architecture and Construction 

Steel tubes are a top choice for standard houses and commercial buildings. It is highly aesthetically pleasing and is commonly employed in railings and stairways across several buildings. It can also be found in roofs and ceilings and can reduce the rate of gas leaks in buildings. 

  • Transportation 

Steel tubes are present in almost everything transportation such as trucks, cars, and planes. It is most commonly present in fuel lines and engines. Steam, gas, oil, and smoke travel through steel tubes more than any other tube type. 

What Size Are Steel Tubes? 

The size of the steel tube depends on the type of steel tube it is. The size of a square steel tube ranges from 0.500*0.500*0.065 wall to 16.000*16.000*0.625 wall. While a rectangular steel tube has sizes ranging from 1.000*0.500*0.065 wall to 20.000*12.000*0.625 wall. A round steel tube has sizes ranging from 0.840 Outside Diameter *0.109 wall to 16.000 Outside Diameter*0.500 wall. 

square tube

How Strong Is Steel Tube? 

The average young modulus of elasticity for steel tubes is about 30 million psi. This strength shows that they are durable and reliable.

What Are Differences Between Steel Pipe And Tube? 

These are the main differences between steel pipe and tube;

  • Structure 

A steel tube is not always round. It can be rectangular or square too. They are mostly seam welded. A steel pipe is always rigid and round. They are mostly pressure rated and seamless to prevent leakage. 

  • Diameter 

Steel tubes and pipes are always measured differently. A steel tube is measured by using the exact outside diameter. The thickness of a steel tube wall determines the strength of the tube. 

A pipe is measured through a nominal outside diameter. The most essential property of a pipe is its inside dimension or capacity. A pipe has a wide range of use and is in various sizes. Tubes are generally applied which require smaller diameters. 

  • Cost 

The manufacturing process of steel tubes requires more energy, labor, and materials. Therefore, the production of steel tubes is costlier than steel pipes. The steel tube price is higher. 

Steel Pipes require an easier production cost and are usually manufactured a lot. This ensures a cut in the cost of steel pipes. 

Which Is Stronger; Steel Pipe or Steel Tube? 

Steel tubes are stronger than steel pipes. Steel tubes perform better when required in an application that requires more strength and durability. 

Is Steel Pipe Cheaper Than Steel Tube? 

Yes, steel pipes are cheaper than tubes. Steel tubes are more expensive to produce. 

Is Tube Stronger Than Rods? 

Rods are stronger than a tube of the same material. Rods are more rigid than tubes due to wall thickness. 

square tube

What Type Of Steel Is Tube Steel?  

There are three main types of steel used in the tubing. They are; 

  • Carbon steel tubing 

  • Stainless Steel tubing 

  • Alloy Steel tubing

Why Is Steel Tubing More Widely Used Than Steel Pipe? 

Steel tubes are widely used more than steel pipes because they are stronger and more rigid than steel pipes. Steel tubing is also easier to install. They are also easily maintained. 

What Advantage Does A Tube Have Over Pipe? 

Often tubes and pipes are used for the same purpose but tubes have several advantages over pipes. The tube is easier to maintain and install and performs better. 

Tubes are designed to not leak, even under extreme operating conditions because they have metal-to-metal seals. Tubes are also readily available in various diameters ranging up to 2 inches with various materials and wall thicknesses to meet the hardest application demands. 

A tube can also be installed faster than a pipe. They are just cut to length, deburred, and fittings are tightened to a nut. Installing a tube of 1 in. takes about 12 minutes compared to a 1 in pipe which takes about an hour to install. Tubes also require a lower cost while installing than pipes. 

Tubes can withstand high pressure and have a higher strength to weight ratio than pipes. 

What Is The Difference Between Pipe Size And Tube Size? 

The main difference between the pipe size and tube size is the way they're measured. Pipes are measured by the nominal outside diameter (also known as Nominal Pipe Size or NPS). Tubes are measured by the exact outside diameter (also known as O.D)

How Do You Measure Tube Diameters? 

The diameter of a tube is measured through the measurement of its outside diameter using a caliper. It is also possible to measure the inner diameter. However, the outer diameter is always measured in most cases.

Learn more about square steel tube from our blog:

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Looking for other steel tubes for sale? At Camasteel, we also provide high-quality Rectangular Steel Tubes  to you!

To learn more about our steel products, please click here to visit our product category page!


  1. Square Tube review by Brooke on 6/10/2021

    You won't regret it but these steel product from Camal

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