Where today is a straight-seam steel electric pipe used? This product, which in modern conditions is widely used in various industries.
Application
As a rule, it is put where it is necessary to transport gaseous or liquid substances with a high degree of aggressiveness. Therefore, pipes of such a plan can be found in mechanical engineering, when laying heating systems of the main level.
Steel electric-welded straight-line pipe is used in industry. You can’t do without it in oil production, construction of scaffolding, in the manufacture of furniture or even sports equipment. Its versatility, good performance, excellent welding capabilities (including home welding) make it possible to use it in a domestic environment for the formation and repair of utility networks.
Dimensions
Electric-welded straight-seam steel pipes for which GOST is numbered 10704–91 produce a certain unmeasured length for a specific diameter. For example, with a value of the latter up to 0.3 cm, the product should not be less than 2 meters long, and if this parameter exceeds 15.2 cm, then the length cannot be less than 5 m. There are also dimensional options when for a given diameter the length the pipe is within certain limits. So, for an indicator up to 7 cm, the size of the article can range from 5 to 9 meters.
Production
What properties should such a pipe have? Steel electric-welded straight-line modification during production should have parameters that correspond to state requirements for articles used in one or another field. For example, pipes for oil and gas pipelines (trunk) are made in accordance with GOST 20295-85. They are formed by welding an electric arc or contact type (the latter using high-frequency currents) with different strength classes (from K34 to K60).
For the manufacture of products, heat-treated or hot-rolled steel (calm or semi-calm) with a content of C (carbon) of not more than 0.2% by weight is used. Its sheets are twisted into a pipe, after which the edges of the sheets are heated by current and squeezed by rolls (electrode rings). The speed of such processes on special machines can be quite high (tens of meters of welding per minute, depending on the wall thickness). The operation is almost always accompanied by cutting products of the desired length using cutting equipment.
An electric welded straight-line steel pipe can be heat treated both over the entire length and only along the weld. On the base metal of the product, captivity, flaws, cracks, sunsets and delaminations are not allowed. Surface defects of an acceptable level should not be corrected by welding (only stripping) in order to maintain the necessary degree of product reliability. Welded seams of the pipe should not have imperfections, cracks, pores, fistulas, slag inclusions that come to the surface.
Cost
How expensive are electric-welded straight-line steel pipes? The price for them, depending on the manufacturer, steel grade, diameter and wall thickness, can range from 32 to 45-48 thousand. When buying, you should always pay attention to compliance with GOST, because within its framework, the product passes the necessary tests, including the proportion of the viscous component, shock bending at different temperatures, tensile, ovality of the article, the length of its deviation, the quality of the metal in welded joint, etc.
Information about which product is planned to be purchased can be found in the stamp on the pipe. It must be affixed at a distance of 10-150 cm from one of the ends, marked with paint and include the year of manufacture, technical control data, steel grade, individual pipe (batch) number, and trademark of the manufacturer.