Manufacturing welding and seamless steel tubes

As the development and development of industrial applications become more complex, the pipeline products and systems that serve them must keep pace.steel pipe supplier

Although there are many pipe manufacturing methods, the most prominent discussion in the industry is comparative electric resistance welding (ERW) and seamless (SMLS) steel pipes.

ERW and seamless steel tube manufacturing methods have been used for decades; over time, methods for producing each method have progressed. Which is better?

Manufacturing welding and seamless steel tubes

Manufacturing welded pipe

The welded pipe begins with a long coiled steel strip called skelp. The turf is cut to the desired length to obtain a flat rectangular sheet. The width of the shorter end of the sheet will be the outer circumference of the pipe and this value can be used to calculate its final outer diameter.

The rectangular sheets are fed by a rolling machine that curls the long sides toward each other to form a cylinder. In the ERW process, high frequency currents pass between the edges, causing them to melt and fuse together.

As the development and development of industrial applications becomes more complex, the pipeline products and systems that serve them must keep pace.

Although there are many pipe manufacturing methods, the most prominent discussion in the industry is comparative electric resistance welding (ERW) and seamless (SMLS) steel pipes.

ERW and seamless steel tube manufacturing methods have been used for decades; over time, methods for producing each method have progressed. Which is better?

One advantage of an ERW tube is that no molten metal is used and the weld is not visible or felt. This is in contrast to double submerged arc welding (DSAW), which leaves a significant weld and must be eliminated depending on the application.

Welded pipe manufacturing technology has improved over the years. Perhaps the most important advancement is switching to high frequency currents for soldering. Before the 1970s, low frequency currents were used. Welds produced by low frequency ERW are more susceptible to corrosion and seam failure.

Most welded pipe types require heat treatment after manufacture.welded pipe supplier

Manufacturing seamless tubes

The seamless pipe begins with a solid cylindrical steel block called a billet. Although still very hot, the billet was pierced with a mandrel. The next step is to roll and stretch the hollow billet. The billet is precisely rolled and stretched until it reaches the length, diameter and wall thickness specified by the customer’s order.

Some seamless tube types harden during manufacturing and therefore do not require heat treatment after manufacture. Others do need heat treatment. Please refer to the seamless tube type specification you are considering to see if heat treatment is required.

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