A Complete Introduction to Steel Hollow Section

STEEL HOLLOW SECTION- A Complete Overview And Details:

Steel is progressing day by day similarly STEEL HOLLOW SECTION is becoming a major part of the construction and mechanical application. Moreover, if you are interested in structural designs you should know that the finest and impressive structures are possible today due to hollow sections.

Interesting enough? Scroll below and find out more engrossing details regarding the hollow section and its types.

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Our ancestors learn about hollow sections and their application through nature. . For instance, the bamboo pole when becomes the source of light building and irrigation of water thus showing the importance of tubular shape.


STEEL HOLLOW SECTION also known as hollow structural section (HSS) is the application of steel. This application includes the conversion of steel into a hollow tube section.  Coils are the source which is passing through dies to produce a variety of sizes in STEEL HOLLOW SECTION.


Fabrication aspects:

After the Second World War, bolted circular structures had numerous joints with gusset plates. Over the period of the last 30 years, the proportion of work to material expenses has expanded quickly in industrialized nations. Hence, more consideration was required for the detailing of straight joints.

Quite far, the joints plan should be without stiffeners or gusset plates. This, in any case, implies that the creator ought to consider the joint strength at the fundamental plan stage.


Welding is the most significant joining strategy for steel hollow segment structures.

By and large, similar welding methods can be utilized concerning open steel segments. The round hollow section comes together with filet welds if the distance across proportion between the segment’s associates doesn't surpass 0. 33 and the weld hole doesn't surpass 3 mm.

Preparation at the end:

The end preparation should be as basic as could be expected under the circumstances. For instance, a whole joint or a 100% cover joint ideally contrasts a joint with mostly covering bracings.


Hot and cold conditions applies to bend hollow sections. It should be considered that the wall thickness of the hollow segment at the outside span of the bend can be diminished. While at the inward side of the arch wall distortion may happen. Further, the care belongs to the ovality of a cylinder therefore, it is important to keep it as little as possible.


The inner faces of the STEEL HOLLOW SECTION are inaccessible. However special measures are present such as the provision of holes. Usually in steel construction there is a direct bolt connection between hollow connections or between hollow and open section.

Moreover, plates and angles known as drill fittings welded to do more than one hollow section. The bolts represents the holes with or without pre-stressing.

What are the mechanical and geometrical properties of the STEEL HOLLOW SECTION?

STEEL HOLLOW SECTION is indeed superior to any kind of steel profile due to its stability. The mechanical and geometrical properties of the tubular segment show under which loadings a saving in the material can be acquired.

Mechanical properties:

The mechanical properties include hardness, toughness, tensile, and yield strength.

Geometric properties:

The selection of hollow segments relies upon their geometric properties and in this manner on the partner resistances for specific stacking cases.


The design strength of a part under tensile stacking relies upon the cross-sectional zone and the design yield pressure. It is free of the sectional shape. On a basic level, there is no preferred position or impediment in utilizing hollow sections from the perspective of the measure of material required.


The fatigue conduct of hollow segment joints impacts to a great extent by the geometrical pressure or strain fixation factor.


There are certain types of steel hollow section:

Square hollow sections-For symmetry:

Square empty areas (SHS) is another well-known sort of primary steel tube that is somewhat of a center arrangement among RHS (Rectangular hollow section) and CHS(Circular hollow section) as far as properties, appearance, and underlying conduct.

SHS highlights a level surface that is additionally practical for joining and welding, with clean lines and insignificant edge planning required.

Square hollow section additionally includes traits of CHS (Circular hollow section), with its even appearance, framed in equivalent sided square hollow segments – instead of round segments.

SHS gives an ideal harmony between strength, usefulness, and stylish appearance for a huge number of uses that requires each of the three angles.

Round or circular hollow section-For aesthetics:

Round hollow segments (RHS) was the main type of hollow area. Usually utilized in a wide scope of primary, mechanical, and development areas.

The round hollow section should always meet the ASTMA 500 Grad B and UNS K 0300 standards for cold forming as well as follows HSLA 70 standards for tubing.

Rectangular cross section-For economy:

Rectangular hollow segments (RHS) are a popular choice for mechanical, primary, and development applications. Moreover, the rectangular state of this sort of hollow area, when joining to other level surfaces areas only should be straight cut. RHS requires insignificant edge groundwork for welding or joining.

RHS is for engineering vibes because of having clean lines close by primary strength.

ERW black steel:

ERW black steel is popular for building scaffolding and projects. However, a hot rolling process is available to manufacture it within a range of 201, 202, 304, 2205 to 904L.

Grades and standards:


EN 10219:235JRH, S275J0H, S275J2H, S355J0H, S355J2H


EN 10219 within steel grades S325, S275, S355.

Pre-Galvanized tubes:

EN 10219 within steel grades DX51 Z180-Z275

Hot-dip galvanized tubes:

EN 10219 within many steel grades.


  • It helps to reduce the volume of design. Hence the design becomes economic.
  • Moreover, the self-weight of the section reduces therefore hoisting and transportation cost decreases.
  • Above all SHS provides better pressure distribution than a solid section.
  • STEEL HOLLOW SECTION also possesses higher torsion resistance than the solid section.

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  • Rectangular STEEL HOLLOW SECTION is widely available in industries such as shipbuilding, construction, concrete structure.
  • STEEL HOLLOW TUBE becomes the part of the automobile as window element, energy-absorbing members, and in thresholds.
  • Moreover, HOLLOW SECTION is also present as highway guardrails, pedestrian, and safety fences.
  • Tubular hollow section exhibits better bending, compression, fire, and corrosion resistance as compared to open member.
  • The circular hollow section serves an aesthetic purpose that is why it is the main material in the construction industry.