LeapZipBlog: oilandgaspipe's blog: Features and scope of seamless pipes

Features and scope of seamless pipes

January 23, 2020 by oilandgaspipe  

Seamless pipes occupy a special place in the pipe market. The fact is that special machines and manufacturing methods are used for their production since conventional methods leave seams.


The most common methods for producing  api 5l x65 seamless pipes are rolling, forging, drawing, or pressing.


As a material, various metals and their alloys can be used. They are selected depending on the principle of the pipe.




Seamless rolling is obtained by rolling an ingot of metal using special equipment that creates holes in the center of the metal. A completely different method for the production of seamless elements is also possible - drilling a hole inside a cylindrical workpiece.


Hot-rolled api 5l x52 seamless pipe is characterized by a large number of features and complexity of manufacture. These include hot rolling only; heat treatment occurs at a temperature exceeding the level of recrystallization.


Seamless rolled api 5l erw pipe is necessarily made using heat treatment methods.


Cold-rolled seamless tubes are processed in the cold state, but before that, hot rolling is carried out.


Due to the variety of methods for manufacturing a api 5l seamless pipe, it is possible to achieve the highest level of product strength and significantly save money, materials, and time.


In the manufacture of seamless pipes, alloyed, high alloyed, carbon and high carbon steel grades can be used. In total, about ten grades of steel are used for the production of seamless pipes, which makes it possible to choose the best option by the needs.



A seamless pipe can be classified by size: multiple measured length, non-measured length, and measured length.


Depending on the manufacturing method, several types of seamless pipes are distinguished: hot-rolled pipe, seamless, and cold-rolled pipes.


astm a249 tubing is seamless, depending on the parameters of the walls, it can be thin-walled and thick-walled. Dimension is calculated based on their external diameter. According to GOST, a hot-rolled pipe in diameter should vary from 25 to 700 mm (outer diameter), while the wall thickness should be 2.5-75 mm. Production of unmeasured products in the range of 4-12 m is possible.


In astm a213 tubing, the outer diameter varies from 8 to 450 mm. Wall thickness should be up to a maximum of 20 mm.


Seamless steel pipes in terms of the ratio of wall thickness to diameter are found from 6 to 13 mm. They belong to a special type of thick-walled. They can be made from various non-ferrous metals. Such materials are used when transportation of chemicals through such elements is provided. What is noteworthy, hot-rolled steel found its application in cryogenic technology.



The main advantage of astm a269 tubing is the absence of seams so that they become almost invulnerable. The absence of a weld increases several times their strength and resistance to external influences.


Its good anti-corrosion properties distinguish a hot-rolled pipe made from a thick sheet of metal.


The seamless pipe can be made from various grades of steel, has a high degree of thermal conductivity and low-temperature linear expansion.