Recently, hot -formed pipes have deserved special attention. For the production of products, alloy, carbon, low -carbon steel, from corrosion alloys are used. The production of hot -formed pipes is carried out by pressing, drawing, the method of hot screw rolling. Pipes can have a different diameter of 25-426 millimeters and wall thickness 2.5-20 millimeters.
Modern technologies make it possible to produce products with increased accuracy of wall thicknesses, displaced tolerances of external, internal diameter. Production technologies allow you to get hot -formed pipes with different processing: mechanical and thermal. Mechanical processing can be carried out by grinding or grinding.
Hot -formed pipes have such a main property as the uniformity of the profile over the entire surface, and, therefore, increased strength. These characteristics allow the use of pipes in areas where high load is carried out on the pipe, fluids and gases exert increased pressure on the pipe. The presence of these properties must be controlled, this provides for GOST hot -formed pipes. Control is carried out by conducting hardness, pressure, bending, flattening, distribution. It also provides for the conduct of hydraulic – and pneumatic testing. Pipe are especially subjected to tests, which are made by directing, extraordinary drawing.
Today, the scope of seamless pipes is very diverse. The performance of work in the field of oil industry is difficult to imagine today without the use of seamless pipes. Thick -walled pipes are widely used where they will be subjected to high pressure, for example, when laying oil pipelines, gas pipelines. Seamless pipes that are used for laying gas pipelines can be used exclusively only after hydrochloring, pneumatic testing. Seamless pipes are used in design and installation boiler, heating systems. Hot -formed pipes have established themselves as reliable details of different elements.