Heavy wall pipe is specified for applications where greater volume is carried, where greater internal pressures exist within the pipe or where the pipe walls must be stronger to support the external burden such as the cover under which they are layed. Heavy wall pipe is also known as Extra Strong or Extra Heavy pipe.
Hot rolled rectangular steel tube is ideal for structural applications, general fabrication, repairs and manufacturing. Its box-shape design allows for increased strength and rigidity over other shapes of hot rolled steel. Hot rolled rectangular steel tube is easy to cut, weld, form and machine.
The most common (and probably cheapest) square structural tubing is made from A36 carbon steel with a maximum yield stress of 36,000 psi.
Rectangular Tube. Rectangular tubes are formed from coils and then ran through a series of dies. They are are welded from the inside to form their shape. Rectangular tubes are generally used for maintenance and structural purposes. Some examples of applications would be building construction, railings, and truck frames.
Low-Carbon Steel Rectangular Tubes. Also known as mild steel, low-carbon steel is easy to machine, form, and weld. It's widely fabricated into parts that don’t require high strength.
Rectangular steel tubing provides great strength-to-weight ratios, which means that less steel by weight is required to accomplish the job. Steel rectangular tubing also provides outstanding support and compression features, which allow this shape of steel to be used for a wide range of column applications.
Laboratory - Heavy wall tubing is highly suited to laboratory plumbing where high pressures are often encountered such as with larger chromatography systems or for hoses connecting gas cylinders. Heavy wall tubing also prevents the tubing from collapsing for procedures requiring a vacuum to be applied.