Differences between seamless and ERW stainless steel pipe

Seamless and ERW (Electric Resistance Welded) stainless steel pipes are commonly usedstainless steel pipes in various industry. Here are the key differences between seamless and ERW (Electric Resistance Welded) stainless steel pipes. Read on to learn more.

1. Manufacturing Process

Seamless Pipes: Made from a solid steel billet that is heated and then either extruded or drawn through a die to form a hollow tube. There is no welding involved, which results in no seam or joint along the pipe’s length.

ERW Pipes: Formed by rolling a flat steel sheet into a cylindrical shape and welding the edges together along the pipe’s length. The seam created by this welding is typically heat-treated to ensure a smooth finish and strength.

2. Strength and Durability

Seamless Pipes: Generally considered stronger due to the lack of a weld seam, which can be a potential weak point. Seamless pipes are preferred for high-pressure, high-temperature, and corrosive environments.

ERW Pipes: The welding process makes the seam the weakest point in the pipe, but modern welding techniques have significantly improved the strength and integrity of the seam. ERW pipes are typically sufficient for many applications but may not be as durable under extreme pressure or stress as seamless pipes.

3. Cost

Seamless Pipes: More expensive due to the complex manufacturing process and the need for precise quality control.

ERW Pipes: Less costly as they are easier and faster to produce, with a simpler process.

4. Application

Seamless Pipes: Used in applications that require high reliability and strength, such as oil and gas transmission, boilers, and heat exchangers.

ERW Pipes: Commonly used in lower-pressure applications like water transportation, fencing, scaffolding, and general structural use.

5. Availability and Size

Seamless Pipes: Available in a wide range of sizes, including smaller diameters and thicker walls, which are difficult to achieve with ERW pipes.

ERW Pipes: Typically limited in terms of thickness and diameter compared to seamless pipes, but are widely available in standard sizes.

Both types have their advantages and are chosen based on the specific requirements of the project, such as pressure, temperature, and the level of corrosion resistance needed.