Hollow Sections

Hollow Section

“Hollow section” (HSS: Hollow Structural Section) refers to a structural shape with a hollow section, usually made of steel. It has the properties of steel, such as high strength, stiffness and corrosion resistance.

In manufacturing and construction, a hollow section is a hollow steel tube or profile. It can be round, square, rectangular, or another shape. This structural shape of tubes or profiles is commonly used in a variety of engineering and construction projects. such as used in components or structures made of metal, plastic, concrete, etc.

Standard & Specifications of Hollow Section

The hollow section produced during the manufacturing of pipes is precise enough to ensure structural integrity. The production standards are strictly taken into account during the manufacturing process, and is available in different steel grades as well. In order for rust prevention, special coatings are also used. These hollow sections are highly efficient and are used in various engineering applications.

Name	Hollow Section
Standard	API, ASTM, BS, EN, JIS, DIN…
Shape	Round, Square, Rectangular
Steel Material	Carbon steel, Alloy steel, Stainless steel, Ductile Iron
Length	3m, 5.8m, 6m, 11.8m, 12m or customized
Wall Thickness	1.24mm -59.54mm or customized
Tolerance	As per different standard
Manufacturing Process	ERW, LSAW, SSAW, SMLS
Pipe Ends	Plain End, Beveled End, Threaded, Grooved
Pipe Surface	Varnishing, Oiling, Hot Dip Galvanizing, Pre Galvanized, FBE, 2PP, 3PP, 2PE, 3PE
Joint Method	Fitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Application	Structure, Construction, Oil, Gas and Water transport, Mining, Sprinkler, Green House…

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Types of Hollow Section

Square Hollow Section (SHS)

Square hollow section (SHS) is a type of structural steel pipe. It is similar to RHS and CHS in characteristics, appearance, and structural behavior.

SHS has a flat surface that makes joining and welding easier. Commonly used in construction and bridge projects.

Rectangular Hollow Section (RHS)

Rectangular hollow sections (RHS) are often used in mechanical, structural, and construction work, just like square hollow sections.

The pipe’s flat surface is more cost-effective for joining and other fabrication work.

Circular Hollow Section (CHS)

With a round cross-section, it provides uniform compressive and tensile properties. Widely used in pipelines, bridges, parts and other fields.

Circular hollow sections (CHS) are often used in architecture for their attractive appearance in many applications.

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Square Steel Pipe Specification

NAME: Square Steel Pipe

STANDARD: ASTM A500, EN10219, EN10296

GRADE: GR.A, GR.B, GR.C

Q195, Q235B, Q345B

Square Steel Pipe Size

Square Steel Pipe(mm)
size	Thickness	Size	Thickness
19×19	1.0-2.0	125×125	2.5-30
20×20	1.0-2.0	127×127	2.5-15
25×25	1.0-3.0	130×130	2.5-15
30×30	1.0-3.75	140×140	2.5-30
32×32	1.0-3.75	150×150	2.5-30
35×35	1.0-3.75	160×160	2.5-30
38×38	1.2-6.0	180×180	2.5-30
40×40	1.2-6.0	200×200	2.75-30
45×45	1.2-6.0	225×225	2.75-30
50×50	1.2-6.0	250×250	3.5-17.75
55×55	1.3-6.0	300×300	4.75-17.75
60×60	1.3-6.0	350×350	4.75-30
65×65	1.3-6.0	400×400	4.5-30
70×70	1.3-6.0	450×450	4.5-30
75×75	1.3-9.75	500×500	4.5-30
80×80	1.3-9.75
85×85	1.3-9.75
90×90	1.3-9.75
100×100	1.5-16
110×110	2.5-30
120×120	2.5-30

Advantages Of Using Hollow Section

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:

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Cost Saving

Hollow sections’ geometric shape allows for efficient distribution of materials, resulting in lighter structures compared to traditional solid beams. This can lead to cost savings in terms of transportation and construction.

Aesthetic Appeal

Hollow sections often have a modern and aesthetically pleasing appearance, making them a preferred choice in architectural and design-focused applications.

Corrosion Resistance

For steel hollow sections, proper coatings or galvanization can provide excellent corrosion resistance, extending the lifespan of the structure in challenging environments.

Reduced Buckling

The closed cross-sectional shape of hollow sections provides greater resistance against buckling and distortion under loads, enhancing structural stability.

Ease of Connection

Hollow tube can be easily connected using welding or mechanical connections. Their uniform shapes simplify joining processes compared to more complex connections needed for W-beams.

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Efficient Use of Space

Hollow sections can be used for integrated functions, such as housing electrical or plumbing systems within the hollow space, optimizing space utilization.

Hollow Section Manufacturing Process

The roll forming process is used to produce hollow tube 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.

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 structural 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.

The application of Hollow Sections

In welded steel frames and columns, hollow structural section 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.