Where now used electric-welded steel pipe?This product, which in modern conditions is widely used in various industries.
Application
As a rule, put it where you want to transport gaseous or liquid substances with a high degree of aggressiveness.Therefore, the tube of such a plan can be found in the engineering industry, the laying of heating main level.
electric-welded steel pipe used in the industry.Without it you can not do for oil, construction scaffolding, in furniture or sport trainers.Its versatility, good performance, excellent opportunities for welding (including your home) you can use it in the living conditions for the formation and repair utilities.
Dimensions
electrically welded steel pipes, GOST 10704-91 which has the number, release certain non-standard length for a given diameter.For example, if the last value of 0.3 cm the product should not be less than two meters long, and if this parameter exceeds 15.2 cm, the length can not be less than 5 m. Also, there are dimensional variations when the length for a given diameterpipe is within certain limits.So, for the record to 7 cm size of the article may range from 5 to 9 meters.
production
what properties should such a tube?Steel electric-welded modification in the production must have parameters corresponding to the state requirements for the articles used in this or that sphere.For example, pipes for oil and gas (trunk) are performed according to GOST 20295-85.They are formed by arc welding or contact type (the latter with high-frequency currents) with different strength classes (from K34 to K60).
to manufacture heat-treated product is used, or hot-rolled steel (quiet or semi-killed) containing C (carbon) is not more than 0.2% by weight.Its leaves are rolled up into a tube, and then the edge of the sheets are heated and compressed shock rollers (ring electrode).The rate of such processes on special machines can be quite high (tens of meters per minute of welding, depending on the wall thickness).Operation is almost always accompanied by a threaded products desired length using a split equipment.
Steel electric-welded heat treatment can get both full length and only in the weld.The main metal products are not allowed to have captured, flaws, cracks, sunsets and bundles.Surface defects permissible level should not be corrected by welding (only stripping) in order to maintain the necessary degree of reliability.Welds pipes should not be poor fusion, cracks, pores, fistulas, slag inclusions that come to the surface.
cost
how expensive electric-welded steel pipes?The price for them, depending on the manufacturer, the steel grade, diameter and wall thickness can vary from 32 to 45-48 thousand.When you purchase you should always pay attention to the conformity of GOST, t. To. In his part of the products pass the required tests, including a shear component, impact strength at different temperatures, the tension on the roundness article, the length of his departure, the quality of the metal inwelded joints and others.
information about what the product is planned to purchase, you can learn from the mark on the tube.It must compulsorily bear at a distance of 10-150 cm from one end, marked with paint, and include the year of manufacture, given the technical control, the steel grade, the individual number of the tube (the party), a trademark of the manufacturer.
