Difference between Seamless Stainless Steel Pipe and ERW Stainless Steel Pipe

There are some customer don’t know how to distinguish the seamless stainless steel pipe and ERW stainless steel pipe. Today, Prime Steel Pipe will discuss about differences between seamless stainless pipe and ERW stainless steel pipe.
What is the raw material required for manufacturing seamless & ERW stainless steel Pipes? Seamless Steel Pipe is made from a solid round steel ‘billet’ which is heated and pushed or pulled over a form until the steel is shaped into a hollow tube. Billets are procured both from indigenous suppliers and from abroad. HR Coils are required to manufacture ERW stainless steel pipes.

How to Identify Seamless or ERW Stainless Steel pipes?

To identify that a pipe supplied is seamless or ERW, Simply read the stencil on the side of the pipe. If it is ASTM A53, Type S means seamless. Type F is furnace but welded, type E is Electrical resist welded.

What is the difference between seamless stainless steel pipe and ERW stainless steel pipe?

1. ERW steel pipe is manufactured by rolling metal and then welding it longitudinally across its length. Seamless pipe is manufactured by extruding the metal to the desired length; therefore ERW steel pipe have a welded joint in its cross-section, while seamless pipe does not have any joint in its cross-section through-out its length.
2. In Seamless steel pipe, there are no welding or joints and is manufactured from solid round billets. The seamless pipe is finished to dimensional and wall thickness specifications in sizes from 1/8 inch to 26 inch OD. Applicable in for High-pressure applications such as Hydrocarbon Industries & Refineries, Oil & Gas Exploration & Drilling, Oil & Gas Transportation and Air and Hydraulic cylinders, Bearings, Boilers, Automobiles, etc.
3. ERW steel pipes are welded longitudinally, manufactured from Strip / Coil and can be manufactured upto 24” OD. ERW steel pipe cold formed from a ribbon of steel pulled through a series of rollers and formed into a tube which is fused through a electric charge. It is mainly used for low/ medium pressure applications such as transportation of water / oil.
4. Common sizes for ERW Steel Pipe range from 2 3/8 inch OD to 24 inch OD in a variety of lengths to over 100 feet. Surface finishes are available in bare and coated formats and processing can be handled on site to customer specifications.
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About Hunan Prime Steel Pipe Co., Ltd

HUNAN PRIME STEEL PIPE is the export gateway of SHINESTAR HOLDINGS GROUP. We are dedicated in providing and exporting high performance-price ratio welded & seamless steel pipes and fittings covering various steel grades. At Prime Steel Pipe, we believe that honest communication, expertise in our industry, and prompt execution lead to strong long-term relationships. Our professioanl team provides " one-stop procurement" servics to coordinate with your project regulation, site and terrain, and ensure the best quality of products by assigning skillful experts at every stage of production. Our principles is to keep the honesty in mind, to win reputation by trust. We strives to providing quality products, competitive price and value-added services to our clients throughout the world.

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