ThePipingMart Blog Metals ERW vs Seamless Pipe – What’s the Difference

ERW vs Seamless Pipe – What’s the Difference

ERW vs Seamless Pipe

Regarding steel pipe, there are two main types: ERW and seamless. Both of these pipes have their unique advantages and disadvantages. Understanding the differences between the two is crucial in determining which is suitable for your next project. This blog post will discuss the pros and cons of ERW and seamless pipes and their critical differences. By the end of this article, you will better understand which type of pipe is best for you.

What is ERW Pipes?

ERW pipes are created by rolling a flat sheet of steel into a tube and then welding the seam shut.

What is Seamless Pipes?

Seamless pipes, conversely, are made by drawing a solid steel bar through a die, creating a seamless tube.

Difference Between ERW and Seamless Pipe


One significant advantage of ERW pipes is that they manufacture more cost-effectively. Since they are made from a flat sheet of steel, they can be produced in large quantities quickly and efficiently. However, the welding process used in ERW pipes can create weak points in the seam, which can sometimes be prone to cracks and leaks.

Seamless pipes, on the other hand, are generally more robust and more durable than ERW pipes. This is because the seamless production process eliminates any internal or external welds, which can be a point of weakness in the pipe. Additionally, seamless pipes have a more uniform thickness throughout their entire length, making them better suited for high-pressure applications.

Another advantage of seamless pipes is that they are less prone to corrosion than ERW pipes. This is because the seamless production process creates a line with a smooth interior surface, reducing the likelihood of decay. Additionally, seamless pipes are often made from higher-grade steel than ERW pipes, which can make them more resistant to corrosion.

Disadvantages of ERW Pipe

One disadvantage of ERW pipe is that it is susceptible to corrosion due to the weld seam. Additionally, ERW pipe can be damaged if the weld seam is not adequately protected during transport and installation.

Disadvantages of Seamless Pipe

One disadvantage of seamless pipe is that it is more expensive to manufacture than ERW pipe. Additionally, the seamless pipe cannot be cut and threaded like an ERW pipe, so it must be ordered in the size and length you need.


Despite their advantages, seamless pipes can be more expensive than ERW pipes. Since they require more specialized equipment and manufacturing processes, they are often priced higher than their welded counterparts. Additionally, because they are made from a single steel bar, seamless pipes are typically only available in smaller sizes.


In conclusion, ERW and seamless pipes have unique advantages and disadvantages. The decision of which type of pipe to use ultimately comes down to your specific project requirements and budget constraints. If you are looking for a cost-effective option for a low-pressure application, ERW pipes may be the better choice. However, if you require a more robust and durable pipe for a high-pressure application, seamless pipes may be the way to go. Additionally, suppose corrosion resistance is a critical factor in your decision-making process. In that case, seamless pipes may be the better option.No matter which type of pipe you choose, it is essential to work with a reputable supplier who can provide high-quality pipes that meet your specifications. By understanding the pros and cons of ERW and seamless pipes, you can make an informed decision to help ensure your next project’s success.

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