【 Weak current College 】 fire commonly used steel pipe standards and knowledge-Power By 【 China power house network 】

The classification of a tube

1¡ ¢ categoryby
(1) seamless tube-hot-rolled, cold rolled steel-tubes, cold-drawn tubes, extrusion pipe, pipe-jacking
(2) welded pipe
(A) divided by technology-arc welded pipe, resistance welded pipe (high frequency, low frequency), gas welding, furnace pipe
(B) press the seam separation--longitudinal welded pipe, spiral welded pipe

2. the classification by the sectional shape
(1) simple section steel tube--round pipe, square pipe, oval, triangular steel pipe, tube, diamond, Hexagon, Octagon-shaped steel tubes, semicircular steel circle, other
(2) complex section of pipe--scalene Hexagon pipe, five-petal flower-shaped pipe, double-convex-concave steel pipe, steel pipes, shaped steel tubes, conical steel pipe, corrugated steel pipes, steel, other supra-

3, according to wall thickness category--thin-walled steel pipe, thick-walled steel pipe

4、category--pipeline steel pipe, steel tubes for thermal equipment, machinery and industrial pipe, oil, geological drilling pipes, containers, pipe, steel, chemical industry special-purpose pipe, other

2. seamless steel tube

Is a kind of hollow sections, peripheral no seams of long steel products. Steel with hollow section, a large number used as the transmission fluid pipeline, such as the transportation of oil, natural gas, coal gas, water and some solid material of pipes, etc. Steel pipe and bar, solid steel compared to the same flexural torsional strength, light weight, is an economic section steel, widely used in the manufacture of structural components and mechanical parts, such as oil drill pipe, motor shaft, bike racks, and building construction with steel scaffolding, etc. Pipe manufacturing ring parts, can improve the material utilization, streamline the manufacturing process, saving material and processing work such as rolling bearing rings, cylinder sleeves, etc., are already widely used for the manufacture of steel tubes. Steel pipe or conventional weapons essential materials, barrel, the barrel, etc. have to pipe manufacturing. Steel pipe cross-sectional shape by different can be divided into tubes and shaped tubes. Since the circumference equal conditions, the round area's largest, with round tube can transfer more fluid. In addition, circle section subjected to internal or external radial pressure time more evenly, so that the vast majority of steel pipe is a pipe.

However, circular tube also has limitations, such as in a plane bending of tubes as square, rectangular tube bending strength, some skeleton, steel wood furniture and implements, such as the popular party, rectangular tube. According to different purposes also requires other section shape shaped pipe.

1. structure for seamless steel tubes (GB/T8162-1999) is used for general structure and mechanical structure for seamless steel pipe.
2. seamless steel tubes for fluid transport (GB/T8163-1999) is used for transportation of water, oil, gas and other fluids in General seamless steel pipe.
3. low and medium pressure boiler seamless steel pipe (GB3087-1999) is used in the manufacture of various structures of low and medium pressure boiler steam pipes, water pipes and locomotive boilers with thermal steam pipe, opium pipes, small smoke pipe and Pipe Arch brick-quality carbon structural steel hot rolling and drawing (rolling) seamless steel pipe.
4. high pressure boiler seamless steel tubes (GB5310-1995) was used in the manufacture of high pressure and the pressure of the water above the boiler heating surface of high-quality carbon steel, alloy steel and stainless steel heat-resistant steel seamless steel pipe.
5. fertilizer equipment used high-pressure seamless steel pipe (GB6479-2000) is suitable for working temperature:-40 ~ 400 ℃, working pressure 10 ~ 30Ma of chemical equipment and pipeline of high-quality carbon steel and alloy steel seamless steel pipe.
6. seamless steel tubes for petroleum cracking (GB9948-88) is applicable to petroleum refinery of furnace tube, seamless steel tube heat exchanger and pipeline.
7. geological drilling pipe (YB235-70) is for Geology departments use core drilling by use of steel, can be divided into the drill pipe, drill collar, core pipe, casing and sedimentation tube, etc.
8. diamond core drilling seamless steel tubes (GB3423-82) is used for diamond core drilling of the drill pipe, casing for core pipe, pipe.
9. oil drilling pipe (YB528-65) is used for oil drilling off the ends of thickened or thickened steel pipe. Pipe-threading and threading, threading tubes Connector connection, no threading tubes on welding joints of methods and tools.
10. vessels use carbon steel seamless pipe (GB5213-85) is manufacturing the ship I-level pressure piping, ⅱ pressure piping, boiler and superheater of carbon steel seamless steel pipe. Carbon steel seamless pipe wall temperature does not exceed 450 ℃, alloy steel seamless pipe wall temperature in excess of 450 degrees centigrade.
11. seamless steel tubes for automotive axle (GB3088-82) is manufacturing the car axle tube and drive axle axle shaft tube of high-quality carbon steel and alloyed structural steel hot-rolled seamless steel pipe.
12. diesel engine with high pressure tubing (GB3093-2002) is the manufacturing of diesel injection system high pressure tubes of cold drawn steel tube.
13. hydraulic and pneumatic cylinder with precision seamless steel tube with inner diameter (GB8713-88) is the manufacturing of hydraulic and pneumatic cylinder bore with precision using the dimensions of the cold drawn or cold precision seamless steel pipe.
14. cold drawn or cold precision seamless steel pipe (GB3639-2000) is used for mechanical structure, the dimensions of the hydraulic equipment with high accuracy and surface finish good cold drawn or cold precision seamless steel pipe.
Selection of precision seamless steel tube manufacturing mechanical structure or hydraulic equipment, etc, you can significantly save machining work, improving material utilization while improving product quality.
15. the structure of stainless steel seamless steel pipe (GB/T14975-2002) is widely used in chemical industry, petroleum, textile, medicine, food, machinery and other industrial anti-corrosion pipelines and structures and parts made of stainless steel hot rolling (squeezeAnd expansion) and drawing (rolling) seamless steel pipe.
16. fluid transport stainless steel seamless pipe (GB/T14976-2002) is used for the transmission fluid made of stainless steel hot rolling (squeeze. expansion) and drawing (rolling) seamless steel pipe.
17. Special seamless steel tube is in addition to other than the pipe cross-section shape of seamless steel pipe. Press the pipe cross-section shape size can be divided into different thickness of seamless steel tubes (code-named D), incoordinate shaped seamless steel pipe (code-named BD), varying diameter deformed seamless steel pipe (code-named BJ). Special seamless steel tube is widely used in various structures, tools and machine parts. And tube-shaped tube than generally have greater inertia and section modulus, high flexural torsional ability, can significantly reduce the weight of steel structure, saving.
　
Third, welded steel pipe
Welded steel tubes, also known as welded pipe, steel sheet or Strip through curl forming welding made of steel tubes. Welded pipe production process is simple, high production efficiency, the variety specification, equipment-less, but the General strength seamless. Since the beginning of the 20th century, along with high-quality strip rolling sprawl and welding and inspection of technical progress, and constantly improve the quality of the weld, welding steel pipe specifications growing, and growing areas instead of seamless steel pipe. Welded steel tubes on the form is divided into the welding seam welded pipe and spiral welded pipe.

Longitudinal welded pipe production process is simple, high production efficiency, lower costs, faster development. Spiral welded pipe of strength than high longitudinal welded pipe, with narrower body production pipe diameter larger pipe, you can also use the same width of the blank production pipe diameter different pipe. But with the same length of the longitudinal seam weld pipe length is increased, compared to 30 ~ 100%, but production speed is low.
Therefore, most of the small diameter of welded pipes, using longitudinal welded large diameter pipe is mostly with spiral welding.

1. low pressure fluid transfer of welded steel pipe (GB/T3092-1993) also known as generic welded pipe, commonly known as the clarinet. Is used for transportation of water, gas, air, oil and heating steam, etc. generally low pressure fluid and other uses of welded steel tubes. Pipe wall thickness is divided into ordinary steel pipe and thickened steel tube; take over side form is divided into non-threaded steel tube (tube) and threaded pipe. Steel pipe specifications with nominal diameter (mm) nominal diameter is an approximation of internal diameter. It is customary to commonly used inches, such as 11/2, etc. Low pressure fluid transfer of welded steel pipe subject directly used for the transmission fluid, but also a large number of low-pressure fluid transport galvanized welded pipe of the pipe.
2. low pressure fluid transport galvanized welded pipe (GB/T3091-1993) also known as galvanized steel pipe, commonly known as the white tube. Is used for transportation of water, gas, air in the oil and heating steam, warm water, and other generally low pressure fluid or other use of hot-dip galvanized welded (furnace welding or electric welding) pipe. Pipe wall thickness is divided into ordinary galvanized pipe and thickening of the galvanized pipe; take over client form divided into non-threaded galvanized pipe and threaded galvanized pipe. Steel pipe specifications with nominal diameter (mm) nominal diameter is an approximation of internal diameter. It is customary to commonly used inches, such as 11/2, etc.
3. ordinary carbon steel wire casing (GB3640-88) is an industrial and civil construction and installation of machinery, equipment and other electrical installation project for protection of steel wire.
4. straight seam welded steel pipe (YB242-63) longitudinal seam and the pipe is parallel to the pipe. Usually divided into metric welded steel pipe, welding thin-walled tubes, transformer cooling tubing, etc.
5. pressurized fluid transport spiral submerged arc welded pipe (SY5036-83) is to make the volume of hot-rolled steel strip, often warm tube forming, with double-sided spiral submerged arc welding method for welding for pressurized fluid transfer of spiral welded pipe. Pipe pressure ability, good weldability, after various strict scientific examination and testing, the use of safe and reliable. Pipe diameter, high conveying efficiency, and saving the laying of the pipeline of investment. Mainly used for transportation of petroleum, natural gas pipelines.
6. pressure fluid transport spiral seam steel pipe (SY5038-83) is to make the volume of hot-rolled steel strip, tube, regular temperature helical high frequency welded lap welding method for pressurized fluid transfer of spiral seam steel pipe. Pipe pressure ability, plastic, easy to weld and molding processing; after all kinds of rigorous and scientific examination and testing, the use of safe and reliable, pipe diameter, high conveying efficiency, and saving of the laying of the pipeline of investment. Mainly used for laying out transportation of oil, natural gas pipeline.
7. General low-pressure fluid transport spiral submerged arc welded pipe (SY5037-83) is to make the volume of hot-rolled steel strip, tube forming temperature frequently, using double-sided spiral submerged arc welded or simplex welding method to use for water, gas, air and steam as general low-pressure fluid transfer with submerged-arc welded pipe.
8. General low-pressure fluid transport spiral seam steel pipe (SY5039-83) is to make the volume of hot-rolled steel strip, tube, regular temperature helical high frequency welded lap welding method for general low-pressure fluid transport spiral seam steel pipe.
9. spiral seam steel pipe pile (SY5040-83) is to make the volume of hot-rolled steel strip, tube forming temperature frequently, using double-sided spiral submerged arc welding or high-frequency welding, for civil engineering structures, docks, bridges Foundation pile pipe.
　
4. steel-plastic composite pipe, large-diameter steel pipe coating
Steel-plastic composite pipe to hot-dip galvanized steel pipe for the substrate, the powder melting spraying in wall (wall when required) coated with plastic, with excellent performance. Compared with galvanized pipe, with corrosion resistance, not rust, scale, smooth smooth, clean and non-toxic, long life and other advantages. According to the test, the use of steel-plastic composite pipe life of galvanized pipe for more than three times. Compared with the plastic pipe, with high mechanical strength, good resistance to pressure and heat. Because the matrix is filled, there is no problem of ageing embrittlement,. It can be widely used in water supply, gas, chemical products such as fluid transportation and heating engineering, is the upgrading of galvanized pipeProduct. Since its installation methods and traditional galvanized pipe, pipe fitting forms are identical, but instead of aluminum-plastic composite pipe in large diameter water transmission, is deeply welcome the user, has become the most competitive market the pipeline of new products.
Coated steel pipe is in large diameter spiral welded pipe and on the basis of high frequency welded pipe coated with plastic, maximum tube diameter up to 1200mm, according to the different needs of coating polyvinyl chloride (PVC), polyethylene (PE), epoxy resin (EPOZY), various properties of the plastic coating, adhesion, resistance to corrosion, is resistant to strong acid, alkali and other chemical corrosion, non-toxic, does not rust, wear resistance, impact resistance, resistance to penetration, pipe surface is smooth, not glued any substance that can reduce transmission time of resistance, improve the flow and transmission efficiency, reduce pressure losses. Coating solvent-free, no leaking substances and, therefore, will not pollute the transmission medium, thus ensuring the purity degree of fluid and hygienic,-40 ° c to + 80 ° c range can be used interchangeably and cold cycles, not aging, not cracking, which can in cold areas, demanding environment.
Large diameter coated steel is widely used in water supply, natural gas, petroleum, chemical, pharmaceutical, telecommunications, power, marine, and other engineering fields.

Steel pipe is a hollow steel strip, a large number used as the transmission fluid pipeline, such as oil, gas, water, gas, steam, etc, in addition, at the made curved, torsional strength, light weight, it is also widely used in the manufacture of mechanical parts and engineering structure. Also used in producing all kinds of conventional, barrel, shells, etc.

Classification: steel tube into seamless and welded steel tubes (seamless). Press section shapes can be divided into tubes and special-shaped pipe, widely used is the circular steel tube, but there are also some squares, rectangles, half circles, hexagonal, octagonal equilateral triangle, and so shaped steel tube.

To withstand the pressure of the fluid pipe must be carried out to validate the hydraulic test pressure capacity and quality, in a specified pressure does not leak, wetting or expansion for qualified, some pipe also according to the standard or demand-side requirements for curling trials, flaring test, flattening test, etc.

Seamless: seamless steel pipe is made of steel ingot or solid billets manufactured by perforation, and capillary by hot rolling, cold rolling or the cold call. Seamless steel pipe specifications with outer diameter * number of wall thickness mm. Seamless steel tube-hot-rolled and cold-rolled (dial) seamless steel pipe.

Steel hot-rolled seamless steel tube in General, low and medium pressure boiler steel pipe, high pressure boiler steel, alloy steel, stainless steel pipe, oil cracking tube, steel and other steel geology.

Seamless cold-rolled (dial) except divide General steel, low and medium pressure boiler steel pipe, high pressure boiler steel, alloy steel, stainless steel pipe, oil cracking tube, other steel, carbon steel, alloy thin-walled steel pipe, stainless steel thin-walled steel pipes, shaped steel tube.

Hot-rolled seamless tubes generally greater than 32mm, wall thickness 2.5-cold-rolled seamless steel tube Department 75mm, diameter, wall thickness to 6mm to thin-walled tubes can 0.25mm, to wall thickness less than 0.25mm 5mm, cold-rolled dimensions than precision.

General pipe is made of 10, 20, 30, 35, 45, and other high-quality carbon structural steel 16Mn, 5MnV, low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc.-or cold-rolled steel guitar. 10, 20, and other low-carbon steel seamless pipe manufacturing is mainly used in fluid conveying pipe.　　45, 40Cr, etc. in carbon into seamless tubes for the manufacture of mechanical parts such as automotive, mechanical parts of the tractor. General pipe to ensure strength and flattening test. Hot rolled steel for hot-rolled or cold-heat treatment condition delivery; to deliver heat to heat treatment status. Low and medium pressure boiler seamless steel tubes used for the manufacture of low and medium pressure boiler, overheated steam pipes, water pipes, water pipes and locomotive boilers with thermal steam pipe, opium pipes, small smoke pipe and Pipe Arch brick and so on.

With high-quality carbon steel hot-rolled or cold-rolled seamless steel tubes (dial). Mainly used for 10, 20, steel manufacturing, in addition to the guaranteed mechanical properties, chemical composition and hydraulic test you want to do, curling, flaring, flattening etc test. Hot to cold-rolled State lead, (dial) to heat treatment condition delivery.

High pressure boiler steel pipe: mainly used for the manufacture of high pressure and more pressure steam boiler pipes, etc. with high-quality carbon steel, alloy steel and stainless steel heat-resistant steel seamless steel pipe, the boiler tube after party at high temperature and high pressure, high temperature flue gas tube and water vapor by also occur oxidation and corrosion, thus requiring durable steel tube with high strength, high oxidation resistance, and has a good organizational stability, using steel are: high-quality carbon steel, steel with 20G, 20MnG, 25MnG; alloy structural steel, steel 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB; rust-resistant steel common 1Cr18Ni9, 1Cr18Ni11Nb high pressure boiler tube subject to ensure chemical composition and mechanical properties, to one by doing the hydraulic test to be flared, flattening test. Steel pipe for heat treatment of the State of the delivery. In addition, on microstructure of finished steel, grain size, decarburized layer also has certain requirements. Geological drilling and oil drilling seamless control; to detect subsurface rock structure, ground water, oil, gas and mineral resources, the use of rig drilling wells. Oil, gas and mining more without drilling wells, geological drilling control seamless steel tubes used in oil is the main equipment for drilling, including core tube, core inner tube, pipe, drill pipe, etc. Because drilling pipe to drill down to a depth of several kilometres of ground work, working conditions are extremely complex, drill Rod withstands tensile, compression, bending and torsion and uneven impact load, stress, but also by mud, rocks and wear, therefore, asked the pipe must have sufficient strength, hardness, wear resistance and toughness, steel pipe steel "DZ "(geology of Hanyu Pinyin-prefix) plus digital a representative steel yield point that commonly used steel grade has the 45MnB, 50Mn DZ45; DZ50 of 40Mn2, 40Mn2Si; DZ55 of 40Mn2Mo, 40MnVB; DZ60 of 40MnMoB, DZ65 27MnMoVB of. Steel tube with heat treatment condition delivery. Petroleum cracking tubes: used oil refinery of tubes, heat exchanger tube and pipe-seamless pipe. Commonly used high-quality carbon steel (10, 20), alloy (12CrMo 15CrMo,), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti) manufacturing. Steel tube subject to permit various chemical composition and mechanical properties, but also guarantee the water pressure, flattening, flaring, test, and surface quality and nondestructive examination. Heat treatment of steel pipe in the State of the delivery. Stainless steel tube: stainless steel hot-rolled, cold-rolled stainless steel tube, widely used in petroleum, chemical industry equipment pipes and various uses of the stainless steel structure parts, should ensure that chemical composition and mechanical properties, where used to withstand the pressure of the fluid-filled hydraulic pressure test to ensure that qualified. Various special steel to guarantee conditions as required.

Welded steel pipe: also called welded pipe, steel or steel tape after bending forming and welding. The weld is divided into longitudinal welded pipe and spiral welded pipe.

By purpose is divided into general welded pipe, galvanized welded pipe, oxygen blowing wires welded pipe, casing, metric welded pipe, pipe roller tube, deep-well pump, automotive tubes, transformer, electric welding profiled thin-wall tubes, welded tubes and pipes with spiral welding.

General welding pipe: General welding pipe for the transmission of low-pressure fluid. Use Q195A, Q235A steel manufacturing Q215A,. You can also use other easy-to-welding of mild steel. Pipe for hydraulic pressure, bending, compression, and other experiments on surface quality requirements, usually have a certain delivery length is 4-10m, often requires fixed length (or multiple lengths) delivery. Welded pipe specifications with nominal diameter (mm or inches) and the actual nominal diameter, wall thickness of welded tubes in accordance with the regulations and the ordinary steel steel tube thickened steel two, according to the pipe end forms and threaded and non-threaded, table 6-17 for welding steel pipe dimensions. Table 6-17 low-pressure fluid transport welded steel pipes (according to GB/T3092-93) nominal bore diameter steel tubes for General steel tube thickened mmin nominal size mm wall thickness allowable deviation theoretical weight kg/m thickness theoretical weight kg/m, nominal dimensions mm tolerance% nominal size mm tolerance% 61/810.0 + 0.50mm-0.50mm2.00 + 12-150.392.50 + 12-150.4681/413.52.250.622.750.73103/817.02.250.822.750.97151/221.32.751.263.251.45203/426.82.751.633.502.0125133.53.252.424.002.913211/442.33.253.134.003.784011/248.03.503.844.254.5850260.0 + 1%-1% 3.504.884.506.166521/275.53.756.644.507.8880388.54.008.344.759.811004114.04.0010.855.0013.441255140.04.0013.425.5018.241506165.04.5017.815.5021.63

With welded steel pipe technology improves and easy processing, now welded tubes instead of seamless tubes, welded steel pipe is capable of producing 219mm (8 inch) above.

Galvanized pipe: to increase the corrosion resistance of steel pipe, steel pipes for General (clarinet), zinc plated. Galvanized pipe in hot-dip galvanizing and two electrical steel zinc, zinc-coated galvanized, zinc-plating layer thickness and low cost.

Blown oxygen welding pipe used as a steel oxygen blowing, generally used with pipe diameter welded steel pipe, the specification consists of 3/8 inch-2 inch eight. With 08, 10, 15, 20 or Q195-Q235 strip steel. For corrosion, some with aluminized processing.

Wire casing: is ordinary carbon steel welded pipe, used in concrete and various structures and distribution project, common nominal diameter from 13-76mm. Wire set casing walls thinner, mostly for coating or galvanized after use, require a cold bending test.

Metric welded pipe: specifications of seamless pipe form, with the outer diameter * thickness mm represents the welded pipe, with ordinary carbon steel, high-quality carbon steel and low alloy steel or the Cape of tropical and cold strip welding, or with tropical welding after the cold call the method.

Metric welded pipe Cape and thin-walled, normal use as a structural element, such as drive shaft, or the transmission fluid, thin-wall is used for production of furniture, lamps, etc., to ensure that steel strength and flexural test.

Roller tube: for belt conveyer welded steel pipe, usually Q215, Q235A, B 20 steel and steel manufacturing, diameter 63.5-219.0mm. On the tube bending, faces to the centerline, ovality have certain requirements, generally for hydraulic and flattening test.

Transformer tube: used in the manufacture of transformer radiator pipe and other heat exchangers, the use of ordinary carbon steel manufacturing for flattening, flaring, bending, hydraulic test.

Steel tube with fixed length or double length deliveries on steel tube bending a set of requirements. Special-shaped tube: from ordinary carbon-steel and steel with welded, 16Mn steel square pipe, rectangular tube, hat-shaped pipe, empty plastic steel doors and Windows, mainly for agricultural machinery, steel structures, steel window door, etc.

Welding of thin wall tube: mainly used to make furniture, toys, lamps, etc. In recent years the production of thin-walled stainless steel tube, high-Furniture, decoration, fences, etc. Spiral welded pipe: low carbon steel and low-alloy structural steel with a Helix angle (called forming corner) into the tube and pipe joints welded together, it can be used relatively narrow strip production large diameter pipe. Spiral welded pipe is mainly used in oil, natural gas pipelines, its specifications with outer diameter * wall thickness. There are single-sided spiral welded pipe welding and double-sided welding, welding pipe should ensure the hydrostatic test, weld tensile strength and cold bending performance to meet the requirements.