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Major use of seamless steel pipes is all about the increase pressure ratings. These pipes are rolled and welded, and the weakest point of the pipe is the welded seam. Seamless steel pipes are continuous extrusion of alloy. The pipes are reliable and have just a few failure points. Seamless pipes are manufactured using steel alloy or hot-rolled round-bar billet of carbon steel. These billets are then cut into the appropriate length and will depend on the required length of the finished tube. It is then heated in a furnace in a temperature of 1200-1300 degree Celsius. In addition, drawing a solid billet over a piercer is used to create the hollow shell or mother blanks, and then tube is formed. Still in hot condition, at one end of the hollow it is crimped and cooled, afterwards, the surface is treated in order to facilitate the next process of tube drawing. With this, the finished tubes are subjected to single, double or triple drawing under 750 degree Celsius, and are slowly cooled in order to remove toughen it and remove internal stress. It would be then cleaned and straightened before its cut to the required exact size. The finished seamless pipes are tested for quality and coated with oil to prevent rust. Increase Pressure Ratings Major use of seamless steel pipes is all about the increase pressure ratings. These pipes are rolled and welded, and the weakest point of the pipe is the welded seam. However, as the name suggests – seamless steel pipes do not have seam, with this, it has uniform tensile strength around the entire circumference of the pipe. In addition, the seamless steel pipe has nominal pressure ratings that are based on the alloy's tensile strength and the pipe's wall thickness. Though, seamless pipe can cost an arm and a leg, however, it allows for smaller pipe weight and wall thickness, which can affect costs and design. Uniform Shape Seamless steel pipes are continuous extrusion of alloy; because of this it has true roundness of the circumference. On the other hand, welded seam pipe is not entirely true to its roundness because welded pipes are wrapped around another form before it's welded. In addition, when it is welded, it does add heat and the equipment adds stress and it will hold the pipe together. Through this process it introduces variables that allow warping of the roundness. But seamless pipe maintain its round cross section, which is great for installation and additional fittings of pipe. Strength under Loads Seamless steel pipes, though expensive it is reliable and with just a few failure points. With this, pressure calculations are easy to perform because welded qualities are now out of the equation. Another good thing to use seamless steel pipes is the strength under loading. To illustrate, en empty pipe has its certain weight that needs supporting over long usage. When the welded pipe begins to transport materials, it has to take account of the weight of the materials. Seamless steel pipes have the strength advantage compared to welded pipes, and a lot of leaks and failures are in welded seam. Final Thoughts Seamless pipes are great to use where resistance to corrosion, strength and product life. These things are crucial to pipes. More so, with the ultra-high strength and corrosion resistant properties, the seamless steel pipes make it perfect for gas and old industry, chemical and other processing industries, pipelines, steam boilers, installations with high pressure and supercritical steam. Collaborate with seamless pipe suppliers that can deliver on their promises. You can’t afford to get in substandard pipes for your applications. Author of this article is associated with Blue Steel Services LLC, which is engaged in OCTG sales, steel coils, electrical conduits, water well casing and pipes.
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