What Are the Key Differences Between a Welded and a Seamless Steel Pipe?

Due to their durability and strength, steel pipes play a crucial role in moving materials across a wide range of industries. So, they are regarded as conduits that keep sectors, such as agriculture, mining, and manufacturing running smoothly. They take charge of efficiently transporting liquids, gases, and solids from one place to another area.

Two of the most robust types of steel pipes are the welded steel and seamless steel pipes. Note early on here that the biggest difference between those two is their manufacturing process, but there are several other key differences to know about those two if you wish to keep yourself informed before your purchase. This guide will tackle these, covering:

– Overview of welded pipe and seamless steel pipe

– Seamless vs. welded pipe: Key differences

What Is a Welded Steel Pipe?

Welded steel pipes are created using flat steel plates or strips, and this particular manufacturing process gives them seams on their bodies. Specifically, as welded pipes are manufactured, bending occurs on the steel plate or strip, then subsequently welded into either a circular, traditional pipe shape or square shape.   

Meanwhile, What Are Seamless Steel Pipes?

Seamless steel pipes are derived from solid steel in sheet or bar form. These are then formed into solid round shapes known as billets, which go through the manufacturing process, specifically heating and casting them over forms, such as piercing rods, to create hollow tubes or shells. 

These pipes are preferred for their power to withstand pressure more efficiently compared to other pipe manufacturing processes. They are also cost-effective, which is why they work best for gas lines and for carrying liquids.

Learn Their Key Differences

Manufacturing Process

Seamless steel pipes are made through the extrusion of a solid steel billet via a piercing rod, creating a pipe without any welds. Meanwhile, welded steel pipes use rolling steel plates or strips for fabrication. They are turned into a cylindrical shape, then welding the seam spirally or longitudinally.

Durability and Strength

Interestingly, the two also differ in terms of strength and durability. Seamless steel pipes are generally stronger because of the absence of welds, though they could be weak points at times. They work best in high-pressure and high-temperature environments, such as power plants and oil refineries. 

So, it follows that welded pipes are relatively weaker. However, advancements in welding techniques have made them incredibly durable for their intended purposes.

Pricing and Production Efficiency

Since seamless steel pipes are generally stronger, they are more expensive, also because of the more complex manufacturing process and limited production capacity. So, if you are looking for a cheaper and more readily available option, then go for a welded pipe.

Size and Thickness Availability

In terms of sizing, seamless steel pipes at larger diameters and thickness are limited in number. Blame this on manufacturing constraints. Thus, they are typically used in smaller, high-pressure industrial applications, such as hydraulic and boiler systems. 

That said, welded pipes are available in a much wider range of diameters and thickness, making them ideal for pipelines, construction projects, and the like.

Corrosion Resistance and Inspection Requisites

Seamless pipes win over welded pipes in terms of corrosion resistance. Furthermore, the latter requires more inspection of the welds to guarantee quality. This can make them more prone to corrosion over time.

Wrapping Up

So, if you ask us, which of the two is better? It really depends on what you are looking for, or the industries you want them to serve. Seamless steel pipes are stronger and more corrosion-resistant, which also makes them expensive. But, if you want pipes with a wide range of diameter and thickness, then choose welded steel pipes.

Get to know more about our brand, YOUFUMI. Our company specializes in providing corrosion-resistant pipes, which is important for their safety and longevity while in use throughout your industry. Contact the YOUFUMI team today to learn how you can incorporate these pipes into your industrial operations.

Reference

5 Most Common Uses for Steel Pipes (1)

Welded vs. seamless steel pipe (2)