Pipe production methods
Stainless steel pipes are a derivative of rolled metal products. Based on the production method, the following types of stainless steel pipes are distinguished:
- Hot deformed;
- Cold-deformed;
- Heat-deformed;
Products can be produced from flat-rolled products, which are subjected to technological bending and subsequent welding. In this way, welded pipes are obtained. For seamless pipes, a stainless circle is used as the starting material, and in this case, piercing, rolling and calibration are used in the manufacture of the pipe. Seamless stainless steel pipe as a single piece has increased strength and high mechanical properties.
Dimensions and weight of stainless steel pipes according to GOST
At the present time, stainless steel pipes are actively used in construction. Their diameter depends on several factors - the manufacturer's company, manufacturing method, wall thickness. In addition, it affects the parameters of the pipes and the purpose for which they will be used. Diameter is the length between the outer edges of the pipe. This distance is equal to two radii.
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Such an indicator is measured in millimeters and is indicated by a special sign?. But, there is also the only exception - samples of GOST 3262-75 in modern industry are usually measured by the inner diameter. Such models are designated by the symbol Du.
What are provided by state standards dimensions of stainless pipes, table will allow you to find out in detail.
It should be noted that according to GOST 8734-75, thin-walled and cold-deformed pipes are distinguished. In the first case, models of such dimensions are produced - 2.5 x 0.3; 4.0 x 0.2; 10 x 4.0; 16 x 2.0; 20 x 3.0; 22 x 1.5; 38 x 1.0; 40 x 2.0; 60 x 1.8. As for hot-deformed samples, here the standard provides for the production of pipes, the parameters of which are - 23 x 5.0; 26 x 4.0; 40 x 5.0; 48 x 6.0; 57 x 2.8; 60 x 4.5; 68 x 4.0; 75 x 5.0; 85 x 9.0; 102 x 10; 120 x 6.0; 133 x 3.0 160 x 4.5; 180 x 10.
According to experts, it is best to use pipes with a standard diameter in production. Stainless steel pipe, dimensions according to GOST which belongs to such a category, allows you to work as simply as possible. If you have information about what the diameter is, then you can select all the necessary elements without any problems - plugs, transitions, fittings, and so on. In addition, the diameter will allow you to calculate weight, size. The pipe is stainless, taking into account all these parameters, it will be as effective as possible.
If the same diameter is noted, then the throughput of stainless models will be an order of magnitude higher than in the case of steel samples. All pipes according to the current standard are divided into three large groups - small, medium and large.
The first category includes those models whose diameter exceeds 50, namely - 59, 89, 108, 114, 159. Pipes of medium diameter are already correspondingly large. As a rule, there are models with sizes - 219, 325, 377, 530. There are other samples, but they are not used so often for one reason or another. And finally, the dimensions of large diameter stainless pipes are 630,820,1220,1620. It should be noted that according to the standard, there are no restrictions. That is, it is quite realistic to purchase pipes of larger sizes than those listed above.
Weight of a running meter of stainless pipe directly depends on the diameter. The mass is calculated, taking into account the grade of the metal used in the production. With information regarding the mass of the pipe, you can easily translate such data into length. The approximate weight of a running meter of stainless steel pipes is indicated in the corresponding GOST.
If you need a stainless steel pipe aisi 304 in production, order them in our online store for various samples that differ in outer diameter, wall thickness. This steel grade is good in that it does not react with liquid and gaseous media. It is classified as austenitic and contains up to 0.08% carbon. Its domestic counterpart is 08X18H10. An alternative could be the A500 fittings.
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There are other alloys with excellent corrosion, chemical and mechanical resistance. We recommend paying attention to such products as stainless steel aisi 316 pipe, whose characteristics are improved due to alloying with molybdenum (addition of 2.5%). Chemical resistance allows the product to be used even in the cold and salty waters of the northern seas. At the enterprises, the compliance of the chemical composition of products with GOST 5632 is monitored. Also, many of our products are manufactured in accordance with GOST, for example, a professional sheet, which can be found here.
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Price for stainless steel pipes with VAT
| Nomenclature | Weight 1 r.m. | Price, RUB / kg | ||
| Seamless 08 / 12Х18Н10Т GOST 9940-81 | ||||
| 57x4.0 | 5,300 | 365,00 | . | |
| 60x5.0 | 6,875 | 365,00 | . | |
| 76x4.5 | 8,044 | 365,00 | . | |
| 76x5.0 | 8,875 | 365,00 | . | |
| 89x4.0 | 8,500 | 365,00 | . | |
| 89x5.0 | 10,500 | 365,00 | . | |
| 108x3.0 | 17,870 | 365,00 | . | |
| 133x6.0 | 28,800 | 365,00 | . | |
| 152x8.0 | 32,950 | 365,00 | . | |
| 159x6.0 | 34,900 | 365,00 | . | |
| 168x10.0 | 39,460 | 365,00 | . | |
| Seamless 08 / 12Х18Н10Т GOST 9941-81 | ||||
| 15x1.5 | 0,600 | 378,00 | . | |
| 16x1.5 | 0,700 | 378,00 | . | |
| 18x2.0 | 0,800 | 378,00 | . | |
| 20x4.0 | 1,275 | 325,00 | . | |
| 21x4.0 | 1,000 | 325,00 | . | |
| 22x4.0 | 1,425 | 325,00 | . | |
| 25x2.0 | 1,548 | 387,00 | . | |
| 25x2.5 | 1,604 | 387,00 | . | |
| 25x3.0 | 1,650 | 387,00 | . | |
| 25x4.0 | 1,770 | 387,00 | . | |
| 28x3.0 | 1,875 | 387,00 | . | |
| 32x2.0 | 1,889 | 335,00 | . | |
| 32x2.5 | 1,841 | 335,00 | . | |
| 32x4.0 | 2,800 | 335,00 | . | |
| 38x2.0 | 1,880 | 335,00 | . | |
| 38x4.0 | 3,400 | 335,00 | . | |
| 42x3.0 | 2,925 | 335,00 | . | |
| 45x3.0 | 3,150 | 335,00 | . | |
| 45x5.0 | 5,000 | 335,00 | . | |
| 48x4.0 | 4,400 | 335,00 | . | |
| 57x3.0 | 4,050 | 365,00 | . | |
| 57x3.5 | 4,681 | 365,00 | . | |
| 76x3.0 | 5,475 | 355,00 | . | |
| 83x3.0 | 5,925 | 355,00 | . | |
| 85x3.0 | 6,075 | 355,00 | . | |
| Profile AISI 304 / 18H10 | ||||
| Sanded | Polished | Matt | ||
| 20x20x1.5 | 286,69 | 288,36 | 222,02 | . |
| 20x20x2.0 | 376,16 | 307,00 | 283,87 | . |
| 25x25x1.5 | 402,00 | 332,21 | 275,96 | . |
| 25x25x2.0 | 435,00 | 426,00 | 404,41 | . |
| 30x30x1.5 | 399,00 | 370,00 | 329,90 | . |
| 30x30x2.0 | 523,68 | 503,00 | 428,18 | . |
| 40x20x1.5 | 552,70 | 402,58 | 389,00 | . |
| 40x20x2.0 | 580,15 | 529,27 | 428,18 | . |
| 40x40x1.5 | 589,00 | 487,64 | 523,35 | . |
| 40x40x2.0 | 783,02 | 714,11 | 778,15 | . |
| 50x25x1.5 | 425,06 | 458,00 | 476,47 | . |
| 50x25x2.0 | 680,00 | 725,00 | 749,35 | . |
| 50x40x2.5 | 980,00 | 995,00 | 1000,00 | . |
| 50x50x1.5 | 690,00 | 744,20 | 626,45 | . |
| 50x50x2.0 | 985,84 | 970,00 | 905,68 | . |
Classification
Stainless steel pipes differ in geometric characteristics depending on the diameter and shape of the pipe section, as well as the type of surface treatment. In cross-sectional shape, pipes can be round, square and rectangular. According to the type of processing, they are divided into:
- Matte
- Sanded
- Polished
The pipe wall thickness makes it possible to divide stainless pipes into thick-walled with high strength and thin-walled. Thin-walled pipes are characterized by high flexibility, therefore they are necessary for the manufacture of complex structures.
Chimney stainless steel
Chimneys contain an extremely harsh environment. These are poisonous gases, condensates with acid deposits, soot. All this affects any material from which the chimney is made. There is little choice here. You can use a pipe one and a half centimeters thick. But here you need to understand that it will take enormous efforts to install such a chimney. In addition, you will need serious masonry that will be able to withstand such power. Or you can simply use a stainless steel pipe, the thickness of which is no more than one millimeter.
Stainless steel pipes have recently begun to be used not only for plumbing systems. They are used as a decorative material for the manufacture of handrails. When combined with chrome plating, the stainless steel looks beautiful and lasts a very long time.
It is worth noting that these are not all areas of application for stainless steel pipes. However, this is enough to understand how popular the material is, which is an alternative to steel pipes and plastic.
Application of stainless steel pipes
Pipes today are indispensable in various fields: in the food industry, in mechanical engineering, in the petrochemical and mining industries, etc. They are used for laying utility lines and pipelines transporting, among other things, aggressive gases and liquids.
Passat LLC supplies seamless and welded stainless steel pipes, round and profile sections.
| SEAMLESS PIPES | ELECTRIC WELDED PIPES | PROFILE PIPES |
The range includes stainless pipes of the following steel grades: AISI 201, AISI 202, AISI 304, AISI 321, AISI-316L, AISI-316Ti, AISI 409, AISI 430, various sizes (square from 20x20mm to 300x3000mm, rectangular from 10x20mm to 400x200mm, round diameter from 10mm to 300mm), and types of surface (polished, mirror, matte).
Stainless steel profile pipes EN 10296
| product name | Width, mm | Height, mm | Wall, mm | Length, mm | Weight 1 rm, kg | Price, rub / r.m |
| Square pipe AISI 201 | 10-100 | 10-100 | 1-5 | 6000 | 0,294-12,359 | negotiable |
| Rectangular pipe AISI 201 | 20-120 | 10-80 | 1-5 | 6000 | 0,453-13,728 | negotiable |
| Square pipe AISI 304 / 304L | 10-300 | 10-300 | 1-12 | 6000 | 0,294-111,227 | from 170.50 |
| Rectangular pipe AISI 304 / 304L | 20-400 | 10-200 | 1-12 | 6000 | 0,453-111,227 | from 157.50 |
| Square pipe AISI 316L / 316Ti | 10-300 | 10-300 | 1-12 | 6000 | 0,294-111,227 | under the order |
| Rectangular pipe AISI 316L / 316Ti | 20-400 | 10-200 | 1-12 | 6000 | 0,453-111,227 | under the order |
| Square pipe AISI 430 | 20-40 | 20-40 | 1-3 | 6000 | 0,613-3,602 | negotiable |
| Rectangular pipe AISI 430 | 30-60 | 15-40 | 1-3 | 6000 | 0,693-3,363 | negotiable |
Characteristics of electrowelded pipes
International standards: electrowelded pipes from austenitic steel grades ASTM A554, A270, A312, A249, A269, DIN 17457, 17455 Seam welding type - TIG, laser seam. Surface: • Matt • Sanded (180, 320, 400 Grit) • Mirror (400,600 Grit)
Symbols for determining the type of surface of an electrowelded pipe
| Surface type | Designation | |
| Matt | Matt, Mill finish | Matt |
| Sanded | Brushed | Brushed, primary grinding |
| Satin 180 Grit Satin 320 Grit Satin 400 Grit | Grinding degree | |
| Mirrored | Mirror 400 Grit Mirror 600 Grit | Polishing degree |
The form: • round • profile Length: 6m (delivery of pipes of any length is possible on request). Sizes: • diameter from 6 mm to 325mm • section from 10x10mm to 300x300mm, 400x200mm Wall thickness: from 0.8 mm to 6 mm
Selection principles
When choosing a stainless steel pipe, you need to pay attention to some factors:
- wall thickness;
- length, section;
- the surface of the parts is matte, polished or mirrored.
Selection of stainless steel pipes
Manufacturers and cost
There are several domestic manufacturers whose products are popular among installers and builders:
- "Steel Pro";
- MetPromStar;
- "Special alloys and steels";
- "Steel Expert".
The price depends on the section, wall thickness, length of the parts. The average cost per 1 running meter is 100–300 rubles.
Benefits
Benefits:
- light weight;
- high strength;
- good flexibility;
- easy installation;
- stainless steel does not emit harmful substances during operation;
- rust does not form on the surface;
- preservation of technical characteristics during temperature fluctuations;
- stainless steel is easy to clean from dirt;
- no additional processing required.
Stainless steel does not change its chemical composition when exposed to other substances.
Fields of application of electrowelded pipes
• Heat exchangers and heaters • Decorations, structures • Oil and chemical industry • Food industry • Shipbuilding and mechanical engineering • Water transportation systems
Product standards according to the intended use (stainless welded pipes)
| USING | E.N. Euro Norm | S.S. | ASTM-ASME | DIN | NFA | GOST |
| Chemical industry | EN 10217-7 | 219711 219713 | A 358-SA 358 A 312-SA312 A 269-SA 269 | 17457 | 49147 | GOST 11068-81 |
| Food products | EN 10217-7 | A 270 | 11850 | 49249 | ||
| Heat exchanger | EN 10217-7 | 219711 219713 | A 249-SA 249 | 17457 2818 | 49247 49244 | GOST 11068-81 |
| Pipeline | EN 10217-7 | A 778 A 269 | 17455 | 49147 | ||
| Drinking water | EN 10312 | DVGW541 | ||||
| Decoration, construction | EN 10296-2 | A 554 | 17455 2395 | 49647 |
Scope of pipe products
Stainless pipes are widely used in construction. Their main difference from a solid square or round timber is that the resulting structures are lighter in weight, but at the same time good rigidity and strength are achieved. Products are used for the following purposes:
- Construction of covered trade pavilions, bus stops, various kinds of hinged structures.
- Manufacturing of billboards and outdoor advertising stands, large arched billboards.
- Production of fences, gates and gates for private and industrial use.
- Erection of frames for shopping centers, sports grounds, stadiums.
- Manufacturing of functional industrial furniture - racks, supports, workbenches.
- Arrangement of metal structures for the construction of low-rise and multi-tiered residential and industrial buildings.
- Production of trade and demonstration equipment.
- Installation of handrails and fences for flights of stairs, steps, gangways.
- Installation of high pressure pipelines for the transportation of aggressive media - oil, gas, steam.
- Construction of conveyor belts in the food, chemical and pharmaceutical industries.
- Construction of hydraulic structures - bridges, dams, reservoirs.
- The use of stainless steel pipes as chimneys when laying stoves and fireplaces.
- Installation of water supply systems with main pipes of various diameters.
- Furniture production, food block equipment, construction of workplaces and sites.
The use of stainless pipes in all spheres of the economy and economy is so widespread that the products occupy a leading position among all rolled metal products supplied to the market. You can purchase certified pipe products from the best manufacturers. We sell high-quality rolled pipes of various shapes and sizes, sections, lengths and surface types at the most affordable prices in the region.
Seamless pipe characteristics
International standards:
- ASTM A312 - Seamless pipes (cold-smoked) from austenitic stainless steels,
- ASTM A213 - Seamless Ferritic and Austenitic Alloy Boilers,
- superheating and heat exchange tubes.
Surface: Matt The form: round Length: 5-7m Sizes: diameter from 6mm to 325mm Wall thickness: from 1mm to 13mm
Applications of seamless pipes
• Pipes of general purpose, chem. and nuclear industry • Heat exchangers • Stoves and chimneys
Determination of the price for the example of stainless steel pipe 100 mm
The cost per meter of a running pipe made of stainless steel can be determined by the following expression:
- Цпмpipe = Цкг х (Dн-δ) х δ х ρst / 1000 (1), where:
- Ckg - the price of 1 kg of pipe, RUB / kg
- Dн - outer diameter of the pipe, mm
- δ - wall thickness, mm
- ρst - density of steel
And, accordingly, the price of one product (pipes of a given length) can be determined:
- Price of 1 pipe = CPMT x l (2), where
- l - pipe length, m
There is a stainless steel pipe 100, wall thickness 6 mm made of steel 12X18H10T. The length of the pipe is 6 m. The density of this steel grade is 7.9 g / m3. The price of one kg is 349 rubles. It is necessary to determine the cost of this pipe. First, we will determine the cost of one running meter of pipe using the expression (1).
- PM pipe price = 349 x 3.14 x (100-6) x 6 x 7.9 / 1000 = 4882.71 rubles
Now let's calculate by expression (2) the price of the 1st pipe 6 m long.
- Price of 1 pipe = 4882.71 x 6 = 29 296, 26 rubles
Product standards according to the intended use (stainless seamless pipes)
| using | GOST | International standard |
| General purpose pipes | GOST 9940-81, GOST 9941-81 | ASTM A312 |
| Heat exchange tubes | GOST 9941-81 (dimensional) | ASTM A213, DIN 17458-85, ASTM SA268, ASTM A269 |
| Instrument tubes | GOST 19277-73, GOST 10498-82, GOST 14162-79, | DIN 17458-85 |
| Boiler pipes | TU 14-3R-55-2001, TU 14-3-460-75, TU 14-3R-197-2001 | |
| Furnace pipes | GOST 9940-81, GOST 9941-81, m / s 10X23H18, 15X25T, | ASTM A312, m / s TP 310S |
Demanded assortment of stainless steel pipes
Stainless pipes according to GOST-9941 81
This standard, validated in the mid-1980s, describes seamless cold- and heat-worked tubular products manufactured from general purpose corrosion-resistant steel. The diameter (outer) of these pipes ranges from 5 to 273 mm, their walls are 0.20-21 mm thick.
Tubular products are manufactured in standard (5-7 meters), as well as multiple measured and unmeasured lengths. The standard is quite loyal to consumer requirements for corrosion-resistant products, therefore it allows their production with a length of 0.5-15 m. True, the manufacture of all non-standard tubular products by the plant must be previously agreed with the customer.
It must be said that in one batch of manufactured products of unmeasured length, pipes can be found:
- 0.5-0.75 meters (walls are less than 0.5 millimeters);
- 0.75-1.0 meters (walls 0.50-1.0 mm);
- 0.75-1.5 meters (when their wall is indicated with a thickness of more than 1 millimeter).
In a batch of rolled pipes with these dimensions, there can be no more than 6%. All corrosion resistant pipes are classified into high, normal and high precision products. Taking this indicator into account, the following deviations (limiting) of pipe products along the wall thickness are permissible:
- 0.05-0.15 millimeters (normal accuracy);
- 0.03-0.10 millimeters and from -11% to + 12.4% (increased accuracy);
- from -11% to + 12.4% (high precision products).
Outside diameter pipes can have permissible error from 0.15 millimeters (high precision) up to 0.4 millimeters (normal) or 0.7-1.3%. For pipes made of 06XH28 MDT steel with a cross section of more than 30 millimeters, a deviation of 1.2% is possible, a cross section of less than 30 millimeters is 0.45 mm.
Requirements for cold and heat-worked stainless pipes
The ends of the finished pipeline are cut off (the cut angle is straight), burrs are removed from them, which can lead to the formation of a chamfer and the formation of surface roughness.This is allowed by regulatory documents. Sometimes even customers negotiate with the manufacturer the need for chamfering at the ends of pipe products, where walls more than 5 mm, since it makes it possible to make the connection of the pipeline with the help of welding more efficiently and efficiently.
On any 1 meter segment, a stainless pipe can have the following curvature characteristics:
- 1 millimeter (walls are more than 0.50 millimeters, cross-section is more than 5 millimeters);
- 2 millimeters (pipes with walls up to 0.50 millimeters and a cross section of 15 millimeters).
If we consider structures with walls less than 0.50 cm with a cross section of up to 1.5 cm, then there is no special tolerance in GOST for this case. The main thing is that the products are made without sharp bends. The ovality of rolled pipes should be such that the diameter of the products does not go beyond the permissible errors in the value of their outer diameter.
The described products are made of stainless steel of these steel grades: 17Х18Н9, 08ХН28МДТ, 08Х17 Н15М3Т, 12Х18 Н12Т, 10Х23 Н18, 08Х18 Н10Т, 04Х18 Н10, 10Х17 Н13М2Т, 08Х13, 12Х17, 12Х18 Н10, 08Х22 Н6Т, 12Х13, 15Х25 Т, and some other high-alloyed metals. The density level of these alloys ranges from 7.6-7.97 g / cm. cubic meters, regarding the temporary resistance - 37-587 kgf / mm. sq. and elongation - 16-46%.
These steel grades can include a small addition of rare-earth metals in the composition, and at the same time meet all 5632 standards. Much attention is paid to the presence of sulfur in products, it cannot be more than 0.02%. Finished pipe products are heat-treated.
