Hollow Section

Hollow section steel is a versatile product used in construction and manufacturing. It is manufactured by rolling coils into different shapes, then cutting them to size. The final shape allows hollow section to be used in buildings as structural members, as well as in pipes, poles, and towers. Because of its hollow design, it can cover and protect wires, pipelines, moving parts and more. In addition to substituting for solid steel goods such as I-Beams and wide flange beams, hollow section can also be used for specialized applications including ship building platforms and bridge girders.

Table of Contents

What is Hollow Section?


The term “Hollow Section” (HSS: Hollow Structural Section) refers to welded steel tube that is utilized as structural elements in buildings and other structures, as well as a variety of manufactured items. It is commonly manufactured using hot-rolled coils. Slitting the coils to the appropriate width for the manufactured portion and then shaping them to the final shape required. Following size formation and seam welding, the tube is cut to the necessary length to make a single piece of pipe.

Hollow Section is a low-cost, lightweight material that is easy to weld, mold, punch, and drill. Its hollow design covers and protects wires, pipelines, and moving parts but allows them to be exposed. Additionally, it can be substituted for solid steel goods such as I-Beams and Wide Flange.

ERW pipe is mainly used in the transportation of oil, natural gas, and other vaporous-liquid objects. In order to meet different needs for high and low-pressure operation, ERW steel tubes have been developed into various specifications, according to their properties.

What are SHS, RHS and CHS?

What is Square Hollow Section (SHS)?

Square hollow section (SHS) is another popular type of structural steel pipe that falls somewhere between RHS and CHS in terms of characteristics, appearance, and structural behavior. SHS has a flat surface that makes joining and welding easier.

What is Rectangular Hollow Section (RHS)?

Rectangular hollow sections (RHS) are a frequently used material in mechanical, structural, and construction applications. This is because the flat surface of the pipe results in a more economical structural solution for joining and various other types of fabrication work.

What is Circular Hollow Section (CHS)?

Circular hollow sections (CHS) are frequently used in a variety of structural, mechanical, and construction applications.

CHS is a popular architectural choice for aesthetic appearances in a variety of applications.

How is Hollow Section Made?

The roll forming process is used to produce hollow sections for construction projects. The coil is continually twisted by the forming rollers and then shaped into circular hollow sections and finally square hollow sections and rectangular hollow sections.

Where Hollow Sections are Used?

In welded steel frames and columns, hollow steel sections are often employed. Because of their enormous strength, they are also frequently employed as steel support beams. Especially rectangular sections are frequently utilized in welded steel frames when components are subjected to loading from several directions. Because they have identical geometry along two or more cross-sectional axes and consequently uniform strength properties, square and circular hollow sections are extremely effective forms for this multiple-axis loading. This makes them suitable for columns. They are also extremely torsion-resistant.

Steel Fabrication


Solar Energy

Mechanical Engineering

Benefits of Using Hollow Sections Compare to W-Beams

Any steel construction with hollow sections gains strength and attractiveness. Employing hollow sections for building and structural purposes has various advantages over using W-beams, from cost savings to flexibility:

Cost Saving

Cost control is critical in every building project. The use of Hollow Structural Sections results in considerable weight reductions, which in turn leads to significant material cost savings. Simply said, it needs less steel to accomplish the same function. Working with hollow sections requires less steel to support a given load, which immediately correlates to material cost reductions. Finally, when unpainted weathering steel is selected in conjunction with the Hollow Structural Section, you get a double dose of cost savings on the original construction as well as further life cycle cost reductions owing to the very low continuing maintenance expenses as compared to a painted structure. You will also save money on transportation, handling, and erection charges when there is less weight involved.


Hollow sections, both weathering and non-weathering, are widely accessible from many steel wholesalers and may be easier to locate for your project than W-Beams.


Because there are so many different sizes of W-beams, choosing the right one for your application might be difficult. There are only 40-60 square and rectangular tube diameters made with hollow portions. Fabrication is further simplified by the straight sides of square and rectangular tubes or hollow sections.