Seamless Pipe
Seamless pipes are widely used in industries such as oil and gas, construction and automotive. These pipes are preferred over welded pipes because they do not have welds, which can weaken the pipe and make it more susceptible to failure.
Gnee Steel (Tianjin) Co., Ltd. is one of the most reliable manufacturers and suppliers of seamless pipe in China, also supports customized service with low price. Welcome to wholesale discount seamless pipe for sale here from our factory. Contact us for free sample.
Seamless Pipe Manufacturing
The manufacture of seamless pipes involves a complex process that produces pipes without any welds or joints. Seamless pipe is typically used in applications that require high strength, pressure resistance, and smooth interior surfaces. The following is an overview of the seamless pipe manufacturing process:
Billet Selection: The process begins with the selection of high-quality steel billets. These blanks are usually made from continuous casting or ingot casting and should meet specific chemical composition and mechanical property requirements.
Heating: Heating the selected steel billet to the required temperature to facilitate the piercing process. Heating takes place in a furnace, ensuring uniform temperature throughout the billet.
Perforation: The heated blank is then perforated to form a hollow tube. Perforation can be achieved by a variety of methods, including rotary piercing, plug rolling or elongating the blank.
Rotary piercing: In this method, the billet is rotated while the piercing point or mandrel is forced through the center of the billet, forming a hole. As the mandrel advances, the hole becomes the inner diameter of the seamless tube.
Plug Rolling: Plug rolling involves using a tapered metal plug to gradually enlarge the piercing to the desired pipe size. This method allows precise control of dimensions.
Stretching: In this method, the perforated stock is stretched over the point of the perforation, thereby simultaneously forming the length and diameter of the pipe.
Heat treatment: After piercing, the pipe is subjected to a heat treatment process to improve its mechanical properties and eliminate residual stress. This step increases the overall strength and toughness of the pipe.
Sizing and Reducing: The pipe then passes through a series of sizing rolls to achieve the desired outside diameter and wall thickness. This step ensures precise dimensions and a smooth surface finish.
Finishing Operations: Additional processes such as straightening, cutting and facing are performed to ensure the pipe meets the required specifications.
Non-destructive testing: Seamless pipes are subjected to various non-destructive testing methods such as ultrasonic testing, electromagnetic testing or hydraulic testing to detect internal or surface defects.
Marking and packaging: The seamless pipe is marked with relevant information, including size, material, production date, and furnace number. They are then bundled, packaged and prepared for shipping.
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