Steel pipe are widely used in various industries. Apply them in engineering, oil & gas, utilities, etc. types of steel metal tubes there are several. They can vary according to the method of manufacture, size and type used for the production of the material. Dimensions of steel pipes of different types defined by Standards.
Basically all modern steel pipe are divided into two large groups: hot rolled and welded. The first kind is more cost. Therefore, use these products less frequently than welded. Assortment of seamless steel pipes GOST 8732-78 is determined. The ratio of the size of such pipes and their weights are given in special tables. Parameters can be, for example, as shown below.
Size | Weight of 1 m |
38х4 mm | 3.35 kg |
70h5 mm | 8.02 kg |
108х10 mm | 24.17 kg |
219х8 mm | 41.63 kg |
377х9 mm | 81.68 kg |
426х10 mm | 102.59 kg |
Dimensions of steel pipe welded and manufactured through furnace welding is discussed below. Their parameters are also exactly determined Standards.
Producing a product of this variety of steel grades 35 and 45 on the continuous mill. It uses the so-called black billet. The latter are sewn in a roller mill, and then sent to a circular saw to trim the ends of the pipe. Then the finished product arrives on konovalovy machine for straightening and reducing the ovality of cross section.
Products of that type, as already mentioned, are more popular than seamless. These pipes are used in the national economy is already quite a long time. However, in recent years their popularity has increased significantly. This is due primarily to the development of new, more advanced methods of welding, allowing to obtain the most reliable and durable products. So, for example, in 1941, was released only 38.8% of welded pipes. The remainder was accounted for by seamless. The share of welded accounted for only 0.8%. Already by 1965 these figures increased to 50% and 35% respectively.
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Today, these products are used everywhere. Most often they are used for laying different kinds of roads, designed for pumping oil, gas, water etc this kind of pipes are usually used in public services. In this case, they are used for laying of water mains and sewer systems. Welded pipe is used also for the Assembly of gas elevated highways, drainage systems, etc.
Engineering — another area in which used welded pipe. Use them for making different kinds of architectural elements: canopies over entrances, awnings, swings, horizontal bars, etc. In agriculture with their use of harvested irrigation system.
Be Different products of this type can:
Method of manufacture. In this case, allocate the pipes made with the use of furnace welding and electric welding. Both of these species are considered quite reliable. Welded pipes can be produced by methods of arc, by contact or induction welding.
The type of coverage. this feature could distinguish galvanized and ungalvanized pipe.
According To From the direction of the seam (longitudinal and spiral).
The Appearance used for the manufacture of Material. Produced welded pipes are usually made from low alloy or carbon steel. Apply either rolled sheet or strip. Sometimes for the production of pipes can be used and other metals: Nickel, copper, magnesium, etc. In this case, usually used with gas or gas-electric welding.
A profile View. On this basis, there are round, rectangular profile, oval tube.
Next, let's look at how is made of welded steel pipe. Assortment GOST in this case governs the accuracy. This applies both to the size and weight of products. In fact the process of production consists of the following steps:
The preparation and formation of the sheet;
Welding, which consists in creating an electric arc between the edges of the workpiece and the electrode;
Final finishing (sizing, chamfering, straightening, etc).
The Main stages of manufacture of pipes with spiral seam is the formation of sheet, welding and cutting on the go. In this case, the sheet metal ribbon is fed into a special node of the camp, where he rolled into a spiral. At the same time and his welding.
Despite the fact that to produce spiral pipe lighter, industries are mainly engaged in production of pipes. The fact that such products are on the market, the most popular.
In the production of welded steel pipes must comply with certain standards. The quality of such products is regulated by GOST 10704-91. Assortment of pipes electrically welded steel pipes specified in this document to the regulations includes types of products:
With standard mechanical properties (marked “And”);
With control of chemical composition (“B”);
With control of both these parameters (“In”);
With standard hydraulic pressure when testing (“D”).
As for the size and weight, longitudinally welded pipes are manufactured in accordance with GOST 10705-80 (for products with a diameter of 10-500 mm) and GOST 10706-76 (for diameters of 478-1420 mm).
Below we present to your attention a table of ratios of diameters of pipes, thickness of the walls and tolerances in accordance with GOST.
Outer diameter | Welding Method | Wall Thickness | Deviations | |
Wall thickness | Diameter | |||
13.5-114 mm | Kiln | 2-4 mm | -15, +8% | From 0.5 mm to 40 mm 1 — more than 40. |
6-125 mm | Electric | 0.4-5.5 mm | 0.1 mm to 0.75 mm and 10% more than 0.75 mm | From 0.3 mm to 2 cm, From 2 to 5.1 cm — 0.5 mm, more than 51 1% |
159-529 mm | 3-8 mm | In accordance with the regulations with respect to deviations in thickness used for the manufacture of metal sheets (for GOST 5587-58и 8597-57) | 1% to 400 mm over 400 mm is used, the calibration of the pipe ends | |
426-1420 | Electric Arc | 6-14 mm | From 2 mm to 720 mm From 3 mm to 1020 mm, From 4 mm to 1220 mm 5 mm, more than 1220 mm | |
159-2020 | 4-15 mm |
The GOST Regulates the ratio of the outer diameter and weight of 1 m pipe with a certain wall thickness. Dimensions of steel pipes in this case are also presented in special tables. Below for example of this a few such ratios.
D | Weight of 1 m pipe wall thickness | ||
1 mm | 2 mm | 3 mm | |
10 mm | 0.222 | ||
20 mm | 0.469 | 0.888 | |
30 mm | 0.715 | 1.38 | |
40 mm | 1.87 | 2.74 | |
60 mm | 2.86 | 4.22 |
Welded steel Pipes, assortment of which is presented above, may vary also:
Product lengths (from five to 12 meters);
Random (2-12 m);
Multiple lengths.
The Product is a multiple of and lengths can have two classes of accuracy: cut ends and trimmed burrs and with cutting in-line mill (without zatorski).
English this term is translated as “tape” or “strip”. Strips for manufacture of welded pipes are used very often. Actually, these strips made from sheet metal. There are strips:
Steel
Galvanized
Stainless steel strips;
With a polymer coating.
Weighing the strip depending on the thickness used for the manufacture of the material can range from fifty pounds to five tons. Supplied to companies specializing in the manufacture of pipes it in Babina or in conjunction definitely on the pallet.
This equipment can be used for manufacturing as the spiral and longitudinally welded products. In the latter case, the machine design includes the following elements:
Foster and the boot device;
Decoiler
Correct machine.
Scissors for cutting the ends of the strip;
A furnace for heating the strip;
Molding-welding and calibration of the mills;
Flying saw, etc.
Before welding the workpiece passes through a special molding press or rolls.
A Mill for the production of spiral pipe consists of the following elements:
Decoiler and receiving rolls;
Guillotine shears
The cleanup device;
Gearbox;
The truck with the cutter;
Bracket welding head, etc.
The process of the formation of the pipe in this mill with a speed of 1.1 meters per minute. The quality of the weld, modern enterprises are inspected using ultrasound. Made the cut pipe after the mill comes in for calibration.
So, you now know how to do and what are the steel electric-welded pipes. Assortment GOST this product determines exactly. Also we understood what the standards are provided in the manufacture of seamless pipes. Exact observance of technology in the manufacturing allows to obtain quality and reliable products of this type are used in many fields of national economy.
Article in other languages:
TR: https://tostpost.com/tr/business/36618-karmas-elik-boru-karmas-elik-boru-diki-li.html
Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."
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