An SMLS pipe is a pipe that has no welding seam. A seamless piping design can create several benefits such as increased strength and a smooth interior finish that is rust-resistant. Commercial, industrial, and residential customers will typically choose seamless pipes for their durability in various applications.

SMLS Pipe Specifications

Our SMLS pipes are produced through a meticulous production procedure that ensures a seamless and uniform structure. These pipes are available in various dimensions and steel grades, each designed to meet different industry standards. The surface coatings applied enhance their durability and resistance to corrosion. The end types and joint methods can be customized to meet specific application requirements. These pipes are machined to perfection and find extensive applications in industries like chemical, petrochemical, and power generation.

ProcedureSMLS (Seamless)
Dimensions13.7mm ~914mm
1/4″ ~ 36″
DN8~ DN900
Thickness1.65mm ~30.96mm
Unit Length3 ~ 18 mtrs
StandardsAPI 5L/API 5CT
DN17175/EN10216 /DIN1629
Surface CoatingVarnishing, Oiling, Hot Dip Galvanizing
FBE, 2PP, 3PP, 2PE, 3PE
End TypePlain, Bevelled, Threaded, Grooved
Joint MethodFitting, Flange, Coupling, Clamp, Pipe Shoulder, Welding
Pipe MachiningWelding, Bending, Hole Drilling, Punching, Swaging, Tapering, Flaring, Expanding
ApplicationOil & Gas, Water Transmission, Solar Energy, Fire Fighting, Construction, Piling Work, Mechanical Engineering, Fabrication

What is SMLS Pipe?

An SMLS pipe is a pipe without any welded connections. Idealistically, the seamless pipe will be a solid metal pipe with each end welded directly to another pipe.

Typically, a seamless pipe begins as a billet, a solid cylindrical hunk of steel. The billet is pierced in the center with a mandrel while it is still hot. The hollow billet is next rolled and stretched; this operation minimizes internal tensions and eliminates burrs from the interior of the pipe. After being rolled and stretched, the pipe is warmed to produce exact dimensions and thoroughly harden its surface.

SMLS steel pipe is widely used in engineering and construction; it is a hollow steel strip with no seams; it is primarily used to transport liquids through pipelines; it has a distinct appearance and is made of a heavy type of steel; it has a high resistance to corrosion and is resistant to general corrosion. This quality allows seamless steel tubes to have a longer lifespan, but what is essential is that they are extremely pure and free of contaminants.

Seamless steel pipe has a high mechanical resistance, regardless of how high the temperature is, seamless steel pipe is uninterested in impact, it is installed and the other pipe is the same, it can replace other piped water and other fluids.

Where SMLS Pipes are Used?

Due to superior mechanical strength and absence of seams, SMLS pipes are frequently used as water wall pipes, boiling water pipes, superheated steam pipes, superheated steam pipes for locomotive boilers, and arched brick pipes. Specifically throughout the nuclear, natural gas, petrochemical, shipbuilding, and boiler sectors.

Oil & Gas


Water Transmission

Piling Work

Solar Energy

Mechanical Engineering

Fire Fighting

Steel Fabrication

How is SMLS Pipe Made?

A cylindrical bar of steel is used to produce SMLS pipe. After heating the bar to a high temperature, a probe is put into the cylinder to produce a hole. The cylinder is then moved to rollers that shape it to the required diameter and wall thickness.

What is the Difference between SMLS Pipe and Seamed Pipe?

SMLS pipe is made using an extrusion method, which involves inflating a cylindrical metal tube through an opening in a die and then cutting it to lengths. The seamless pipe has no welded joint; thus, it has more strength and higher pressure capacity than equivalent size seamed pipes. The seamed pipe is made in a rolling process, which means that the welded joint is formed during production.


Seamed Pipe

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