It really depends on your application or project, because different specs and grades of steel pipe have unique characteristics. This is due to the floating die used in the manufacturing process. The wall thickness of seamless pipe will vary as you go down the pipe, sometimes starting larger and becoming smaller. The drawback of seamless steel pipe is its concentricity. A great deal of variety exists between the different pipes. The damage is not uniform, so neither is the resulting pipe length. Simply put, the process damages the ends of the pipe and as a finishing step the mill cuts off the damage. Specifying the minimum required length needed for a project or application becomes very important. This range of lengths is a by-product of the manufacturing process. An SRL ranges from about 18ft to 24ft and a DRL ranges from 35ft to 44ft. Rather, a mill will make either “single random lengths” (SRLs) or “double random lengths (DRLs). Unlike almost any other material in the world, seamless pipe is not manufactured to a specific length. The result is a continuous steel cylinder of uniform strength.
Seamless pipe series#
The hollow cylinder is then massaged over a series of rollers and dies to achieve the desired size. So, when the billet is red hot, the center of the billet is pushed out, creating a hollow cylinder. From the furnace, the billet is transferred and pierced. The billet is super-heated in the mill furnace, just to the point where it is about to lose shape. To make a seamless pipe, the mill starts with a solid cylinder of steel called a billet. It does not show the joint where two pipes are connected.
As the name implies, seamless steel does not have a weld seam.
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