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.
ERW (Electric Resistance Welded) pipes are welded longitudinally, manufactured from Strip / Coil and can be manufactured up to 24" OD. ERW pipe cold made by the ribbon of steel pulled by a set of pliers and shaped in to a tube that's fused through an electric fee. It's largely utilized for non - moderate pressure applications like transport of oil / water.
Typical dimensions for ERW Steel Pipe include 2 3/8 inch OD into 24 inches OD in various lengths to over 100 feet. Surface finishes are offered in bare and protected processing and formats can be dealt with on site to customer specifications.

How to Identify Seamless or Electric Resistance Welded (ERW) steel angle suppliers

The main method used to identify whether a pipe provided is seamless or Electric Resistance Welded,One can Simply Read Through the stencil printed over the side of the tube.

Type E is ERW.
Type F is Furnace but Welded.
When it is printed as ASTM A53, The S Means it is Seamless.

There are other methods that are used to identify the two types but the above three methods are the simplest means to recognize whether the pipe is either seamless or Electric Resistance Welded.
In a Nutshell, Seamless Steel Pipe rarely has defects. However, welding comes with an intrinsic defect all through the duration of each tubing, also as mentioned previously. Intuitively this notion is readily accepted by buyers and designers who have modest working experience with the several services and products. Each item manufacturing and form procedure has its inherent difficulties and possible defects. Consumers need to understand exactly what those issues and flaws are and also how they may impact particular product and it's applications. They then are able to make a decision based on reality of the product features as opposed to what people think of.