Steel electric GOST 10704-91 is one of the most popular types of rolled pipe in particular and metal in general. What justified such a high demand? Let's find out!
regulatory documents
Before we move on to the answer, it is necessary to divide the attention aspect, is the basis for the production of all without exception rental - state standards. In this case, they are:
- GOST 10704-91 - Electrically welded steel tubes assortment
- GOST 10705-80 - Technical requirements for pipe diameter 10-630 mm.
- GOST 10706-76 - Specification for diameters 478-1420 mm.
The above documents refer exclusively to products with direct suture. There are also spiral welded pipes, but details on this species, we will not stop.
assortment
According to GOST gauge steel welded pipes composed of products the main parameters which are indicators of the inner diameter and wall thickness. They accordingly can be varied within 10-1420 mm, 0,8-32 mm.
As for the length, it may be unmeasured, dimensional and multiple.
For pipe length random length of the finished product depends on the diameter and equals:
- > 2 m for a diameter of 30 mm,
- > 3 m for a diameter of 30-70 mm,
- > 4 m for a diameter of 70-152 mm,
- > 5 m for a diameter of more than 152 mm.
Similar requirements are specified for pipes cut length:
- 5-9 m for a diameter less than 70 mm,
- To 6-9 m diameter 70-219 mm,
- 10-12 m for a diameter of 219-630 mm.
For products of multiple lengths multiplicity is not less than 250 mm and not more than the lower limit value specified for the same product measured length.
Rental dimensional and multiple length and is divided into two classes of accuracy:
- I - with all cutting and deburring,
- II - in a cutting mill line (without deburring).
making
Steel electric GOST 10704-91 - https://stvybor.ru/chernyj-metall/truba-elektrosvarnaya/produced on continuous lines (pipe mills) of the roll of strip. At the end of the new roll of blank just were welded to the remainder of the previous one. In order to counteract the bias and provide the same tape width over the entire length of its pre-trimmed at the edges.
Next, the tape is minimized in blank pipe and is run on rolling stands with rolls disposed in pairs, by which the product is formed and the desired diameter.
The resulting preform unclosed welded by high frequency currents. At this stage there is a longitudinal seam on who called this kind of rolled steel. welding place further trimmed, so that virtually finished pipe passes several rows of rolls, finally forming geometry, and is cut off at the desired length of the product.
application
The main direction - the use of electric-welded pipes for the installation of various pipelines, including:
- Trunk pipelines for gas, water and oil.
- Diversion branches of the central routes to specific objects.
- Creation of heating systems and gas in the residential and non-residential construction.
- Installation of systems of communication in the workplace.
However, such use - is not the only option available. Electrically welded steel tubes are also used:
- As the workpieces in the production of various metal such as railings, stairs, barriers or traffic signs.
- In modern architecture as elements carcasses or separate parts.
- In the production of cars, machines, cars.
- In construction, as one element of metal frames.
- In other industries.
Extensive use, high strength, a variety of sizes, versatility, opportunities mounting (welding muff to or flange connection), the possibility of additional processing significantly improves the durability and resistance to external influences, and affordable prices - that it is justified and consistently high demand for welded steel pipe.
