Seamless steel pipe NGP st. 20 / 09G2S GOST 8732-78 is a type of rolled pipe that is made without welds, which gives them high strength and resistance to external factors. Unlike welded pipes, which are produced by folding and welding a sheet or strip of metal, seamless pipes are made from a single metal billet (ingot or die) that goes through the process of rolling, hot or cold drawing, and other types of deformation.

The production process of seamless pipes includes several stages:

Rolling (1) - a solid billet is heated to a high temperature and then rolled through special shafts, forming a hollow cylinder.; Piercing (2) - The workpiece is pierced to create a hole that will become the inner channel of the pipe; Rolling (3) - next, the pipe can be subjected to a rolling process to achieve the required wall thickness and diameter.; Calibration (4) - After rolling, the pipe is calibrated to ensure accurate dimensions and smoothness of the surface.

Advantages of Seamless Steel Pipes

• High strength. The absence of welds ensures uniform stress distribution along the entire length of the pipe, which increases its strength characteristics.
• Resistance to high pressures and temperatures. Due to the absence of seams, seamless pipes can withstand high pressures and temperatures, which makes them indispensable in critical operating conditions.
• Durability. Seamless pipes have high wear resistance and corrosion resistance, which increases their service life.
• Dimensional accuracy. Modern production technologies make it possible to produce pipes with precise internal and external diameters, as well as wall thicknesses.
• Tightness. Due to their solid structure, seamless pipes have high tightness, which is important when transporting liquids and gases.

Application of seamless pipes

Oil and gas industry

Oil and Gas Transportation - Seamless pipes are widely used to transport oil, gas, and other hydrocarbons over long distances, including underground and underwater pipelines.
Well drilling - used as casing strings and pipes for drilling oil and gas wells.

Chemical and petrochemical industry

Processing and production are used in installations for processing oil, gas and chemical products, where pipes with high corrosion resistance and the ability to withstand high temperatures and pressures are required.
Pipelines for aggressive media are used to transport aggressive chemicals, acids, alkalis and other reagents.

Energy industry

Steam generators and heat exchangers are used in steam boiler systems, heat exchangers and other installations where pipes with high thermal conductivity and resistance to high temperatures are needed.
Nuclear power is used in reactors and other installations where pipes with the highest levels of strength and reliability are required.

Mechanical engineering

Manufacturing of parts - seamless pipes are used to manufacture various parts and components of machines and mechanisms where high strength and resistance to wear are required.
Hydraulic systems are used in hydraulic cylinders, high-pressure systems, hydraulic drives and other mechanisms.

Shipbuilding and aerospace industry

Ship Systems - Seamless pipes are used in shipbuilding to create strong and durable pipeline systems capable of withstanding high loads and aggressive marine conditions.
Aviation and space technologies are used in aircraft, rocket, and engine designs where pipes with minimal weight and maximum strength are required.

Construction

Supporting structures are used in the construction of buildings and structures, including for the creation of supporting columns, supporting structures of bridges and other architectural objects.
Infrastructure projects are used in various infrastructure projects such as water supply, sewerage, and gas pipelines.

Production and processing features

• Technological processes: The production of seamless pipes requires the use of sophisticated equipment and technologies such as hot rolling, cold deformation, calibration and heat treatment.
• Precision and quality control: During the production process, seamless pipes undergo strict quality control, including ultrasound and X-ray flaw detection, which makes it possible to identify and eliminate defects at an early stage.
• Welding and Joining: Seamless pipes are easily joined using welding, flanges or other methods, providing a reliable and tight connection.
• Corrosion resistance: Depending on the application, seamless pipes can additionally be coated with protective layers or made of special corrosion-resistant alloys.

Seamless steel pipes are a high–quality and reliable material that, due to its unique characteristics and wide range of applications, occupies an important place in various industries and construction.