Pipe 76 mm seamless and electrofusion: distinctive

If you are interested in a pipe of 76 mm (outer diameter), then you should not forget that such a profile is produced according to two different State Standards, this is GOST 8732-70 (seamless seamless) and GOST 10704-63 (electrowelded).

In addition to these two standards, there are various additions - TU and DU (conditional diameter), but this is quite a narrow specialization, where products are manufactured in small batches for certain technical conditions and are most often made to order, so you can only get it directly from the factory .

Now we will talk about the products that can be found in warehouses and in stores, and in addition, thematic demonstration of the video in this article will be provided to your attention.

Pipe according to GOST

Note. If you need a pipe of 76 mm in diameter, then you will have to coordinate this most conditional internal diameter with the manufacturer. That is, in fact, you stipulate the thickness of the wall or strips.

What to look for when buying

• Depending on the purpose for which you are going to acquire the 76-millimeter profile, you will have to pay attention not only to its outer diameter, but also to the internal one or simply to the wall thickness if you are not interested in its cross-country ability.. So, the instruction in accordance with GOST 10704-63 (electrowelded) indicates the thickness of the metal (rolled sheet) in the size: 1.4 mm; 1.6 mm; 1.8 mm; 2.0 mm; 2.2 mm; 2.5 mm; 2.8 mm; 3.0 mm; 3.2 mm; 3.5 mm; 4.0 mm; 4.5 mm; 5.0 mm; 5.5 mm. According to GOST 8732-70 (seamless), this parameter will be 3.5 mm; 4.0 mm; 5.0 mm; 7.0 mm; 8.0 mm; 10.0 mm.
• This parameter determines how much 76 pipe weighs (mass is usually taken into account per running meter), as well as its cost, not counting the manufacturing method (electrowelded or seamless), on which pricing also depends. But if you do not delve into the subtleties of mercantile calculations, then we can say that the price of products depends on the weight of the metal in one running meter, therefore, the more expensive is the thick-walled one.

• In terms of popularity, a thin-walled profile certainly takes a leading position in front of a thin-walled one (material cost plays a decisive role), but it’s still important to pay attention to technical specifications, especially when installing pressure pipelines. For example, heating of 76 pipes is not done as flat pipework, but as risers and highways, therefore, it is important to take into account the pressure (maximum) pressure of the heat carrier. Even for an ordinary fence, a thin-walled profile will not be entirely appropriate - in this case, of course, the electrowelded profile is quite suitable, but the thicker the sheet, the higher the service life of the fence.
• It happens that the seller voices the price of the material not by the meter, but by the tonnage and for the uninitiated person it is quite difficult to understand, but here you just need to take into account the weight of 1 meter of pipe 76 mm with different wall thickness. Thus, taking into account this parameter, you can easily find out the number of meters in one ton of a particular product, in which the tables below will help you. If there is no possibility to weigh the material, and the price is given by tonnage, then such a calculation can be easily done with a pencil or paper, but for this, again, you need to know the mass of the meter.

Tables

Electrowelded longitudinal (GOST 10704-63)

Seamless seamless (GOST 8732-70)

Note. Using this table, you can easily determine the parameters you need, for example, if the weight of a 1 meter pipe 76x3 mm (seamless) is 5.4 kg, then in one ton it will turn out 133.3 m of production. Or, for example, a pipe weight of 76x4 mm (electrowelded) is 7.103 kg, then in one ton it will be 140.8 m of the profile.

Properties and application

Depending on the operational need (target), such pipes are made from certain steel grades corresponding to a certain State Standard.

• A - Mechanical properties are standardized according to GOST 380-88. Steel grades: St2sp, St4sp, St5sp, St6sp.
• B - Mechanical properties are standardized according to GOST 380-2005 (amended), 1050-88, 4543-71 and 19281-89.
• B - Mechanical properties are standardized according to GOST 380-2005, 1050-88, 4543-71 and 19281-89.
• G - Mechanical and chemical properties are normalized according to GOST 1050-88, 4543-71 and 19281-89. The control of mechanical properties is carried out on samples after heat treatment.
• E - These pipes are not rated for chemical composition and mechanical properties. This option involves testing for hydraulic pressure.

Seamless pipes are also called oil and gas, that is, their main application is in the field of oil and gas pipelines and water-supply lines, that is, everywhere where there are increased quality requirements. But the electric-welded profile of pipes is more often used as a structural material in mechanical engineering, construction and various structures of a domestic nature and their installation is done by hand.

Conclusion

Knowing the weight of the pipe 76x3 mm or, for example, 765 mm per linear meter, you can easily make an estimate of their installation for any work on your site or production facility. It should be borne in mind that the purchase from large manufacturing companies, as a rule, is somewhat cheaper.