First, the classification of steel pipe
1 Classification according to production method
(1) seamless steel pipe - hot-rolled tubes, cold rolled pipes, cold drawn tube, extruded tube, pipe jacking
(2) pipe
(A) according to the process - arc welded pipe, ERW pipe (high-frequency, low frequency), the gas pipe, stove pipe
(B) - longitudinally welded pipes, spiral welded pipe weld points
2, the cross sectional shape classification
(1) simple section steel - Round steel pipe, square steel pipes, oval steel tube, triangular steel tube, hexagonal steel pipe, diamond steel, octagonal steel pipe, semi-circular steel round, other
(2) The complex cross-section pipe - equilateral hexagonal steel pipe, five plum blossom-shaped steel tube, double-convex steel pipe, double concave steel, oval-shaped pipe, conical steel pipe, corrugated steel pipe, case steel pipe, other
3, according to the classification of wall thickness - thin-walled steel pipe, thick-walled steel pipe
4, use classification - pipeline with steel pipes, thermal equipment with steel pipes, machinery for industrial use with steel pipe steel pipe, petroleum and geological drilling, container steel, chemical industrial pipe, special-purpose steel pipes, other
Second, the standard of seamless steel
A hollow sections, peripheral joints of the long strips of steel. Steel hollow sections, a large number for a pipe conveying fluid, such as the transportation of oil, gas, gas, water and some solid materials, pipes, etc.. Such as steel pipe and round bar of solid steel compared to the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive transmission, bicycles frame construction using steel scaffolding. Steel pipe manufacturing annular parts, can increase the material utilization, simplify the manufacturing process, saving material and machining time, such as rolling bearing rings, jack sets, has been widely manufactured steel pipe. Steel pipe or a variety of conventional weapons, an indispensable material, barrel, barrel must be steel pipe manufacturing. The steel pipe according to the different cross-sectional area shape can be divided into tube and Yixingguan. More fluid can be transported under the same conditions in the perimeter area of ??a circle, with a round tube. In addition, the ring cross section to withstand internal or external radial pressure force is more uniform, so the vast majority of steel pipe is a tube.
However, the tube also has some limitations, under the conditions of the plane bending, the tube is not as good as square, rectangular tube bending strength, on the common side of farm machinery skeleton, steel and wood furniture, rectangular tube. According to different uses, should also have other cross-section shape of the shaped pipe.
(1) the structure seamless steel pipe (GB/T8162- 1999) is used for general structural and mechanical structure of seamless steel pipe.
Fluid conveying general seamless steel pipe for conveying water, oil, gas and other fluid with seamless steel pipe (GB/T8163-1999).
Low and medium pressure boiler seamless steel pipe (GB3087-1999) is used in the manufacture of a variety of structures is low and medium pressure boiler superheated steam, boiling water pipe and locomotive boiler superheated steam pipe, opium pipe, small pipe and arch brick tubes of quality carbon structural steel hot-rolled and cold drawn (rolled) seamless steel pipe.
(4) high-pressure boiler seamless pipe (GB5310-1995) is used in the manufacture of high pressure and over pressure water tube boiler heating surface with high-quality carbon steel, alloy steel and heat-resistant stainless steel seamless.
Fertilizer equipment with high-pressure seamless steel pipe (GB6479-2000) is applicable to operating temperature -40 ~ 400 ℃, working pressure of 10 ~ 30Ma chemical equipment and pipeline quality carbon structural steel and alloy steel seamless steel pipe.
Petroleum cracking seamless steel pipe (GB9948-88) is applicable to the oil refinery furnace tubes, heat exchangers and pipe seamless steel pipe.
7 geological drilling pipe (YB235-70) for the geological department core drilling, use of steel pipes, can be divided by end-use drill pipe, drill collars, the core pipe, casing and precipitation tubes.
8 diamond core drilling with seamless steel pipe (GB3423-82) is used for diamond core drilling, drill pipe, seamless steel tubes of the core rod, casing.
Oil drilling pipe (YB528-65) is used to thicken or external upset oil drilling at both ends of seamless steel pipe. Steel tube sub-threading and threading two Threading Pipe Fittings links, non-threading works butt links with the tool joints.
The ship carbon steel seamless steel pipe (GB5213-85) is to create a pressure pipe system of ships Class I, class II pressure piping, boilers, and overheating of the uses of carbon steel seamless steel pipe. Carbon steel seamless pipe wall temperature does not exceed 450 ° C, alloy steel seamless pipe wall temperature over 450 ℃.
11 automobile axle casing seamless steel pipe (GB3088-82) is the manufacture of automobile axle casing and the drive axle shell axis effective quality carbon structural steel and alloy structural steel hot-rolled seamless steel pipe.
12 engine manufacture diesel injection system, high pressure pipes cold-drawn seamless steel pipe with high-pressure tubing (GB3093-2002).
13 hydraulic and pneumatic cylinder with precision internal diameter seamless steel pipe (GB8713-88) is used in the manufacture of hydraulic and pneumatic cylinder with precision inner diameter cold drawn or cold rolled precision seamless steel tubes. Company website www.sdggjt.com
14 cold drawn or cold rolled precision seamless steel pipe (GB3639-2000) is used for mechanical structure, hydraulic equipment, high dimensional accuracy and surface finish, good cold drawn or cold rolled precision seamless steel tubes.
Use precision seamless steel tube manufacturing mechanical structure or hydraulic equipment, etc., can greatly reduce the mechanical processing time, improve material utilization, and help to improve the product quality.
15 structure is widely used in chemical, petroleum, textile, medical, food, machinery and other industrial corrosion of piping and structural parts and components made of stainless steel hot-rolled (with stainless steel seamless pipe (with GB/T14975-2002) extrusion, expansion) and cold drawn (rolled) seamless steel tubes.
16 fluid transport stainless steel seamless pipe (GB/T14976-2002) is used for the transmission fluid made of stainless steel, hot rolled (extrusion, expansion) and cold drawn (rolled) seamless steel pipe.
17 Shaped seamless steel pipe is the general term in addition to the sectional shape other than round tube, seamless steel pipe. Shaped seamless steel pipe wall thickness according to different shapes and sizes of steel pipe cross-section can be divided into (code D), ranging from wall thickness of the shaped seamless steel tubes (code BD) variable diameter Shaped seamless steel pipe (code for the BJ). Shaped seamless steel tubes are widely used in various structural parts, tools and mechanical parts. And tube, Special Pipes generally have a greater moment of inertia and cross-section modulus, flexural and torsional capacity, can greatly reduce the structural weight saving steel.
Welded steel pipe standards
Welded steel pipe, said pipe is made of steel pipe welded plate or strip after curl forming. Welded steel pipe production process is simple, high production efficiency, and many varieties of different specifications, equipment owned, but the general strength is less than seamless steel pipe. Since the 1930s, with the progress of the rapid development of quality steel rolling production, welding and inspection techniques, weld quality improved, increasing number of varieties and specifications of welded steel pipe, and more and more areas instead of pipe joints. Welded steel pipe according to the form of a weld is divided into a straight seam welded pipe and spiral welded pipe.
Longitudinal production process is simple, high efficiency, low cost, rapid development. The strength of the spiral welded pipe is generally higher than the Longitudinal, can narrow the billet production of large diameter pipe, you can also use the same width of the billet production of different diameters of pipe. However, compared with the same length of straight seam pipe, the weld length increased by 30 to 100%, and lower production rate.
Therefore, smaller diameter pipe mostly straight seam welded pipe of large diameter are mostly spiral welded.
A low pressure liquid delivery pipe with welded steel pipe (GB/T3092-1993), also known as the general, commonly known as the clarinet. Used for conveying water, gas, air, oil and heating steam low pressure fluid, and for other purposes welded steel pipe. The steel pipe connected to the wall thickness is divided into ordinary steel and thicker steel; take over the side into the form without the steel pipe (fluorescent tubes) and with a steel pipe. Specifications of the tubes with nominal diameter (mm) said that the nominal diameter is the diameter of the approximation. The habit usually expressed in inches, such as 11/2 and so on. The low pressure fluid welded steel unless used directly in the transmission fluid, but also a large number used as a low pressure fluid of the original tube of galvanized welded steel pipe.
(2) the low pressure fluid galvanized welded steel pipe (GB/T3091-1993) also known as galvanized welded steel pipe, commonly known as white tube. Is used for conveying water, gas, air, oil and heating steam, heated and other general low pressure fluid or other uses hot-dip galvanized steel pipe welding (furnace welding or welding). Steel pipe connected to the wall thickness is divided into ordinary galvanized steel and thicker galvanized steel; take over the side into the form of threaded galvanized steel pipe and threaded galvanized steel pipe. Specifications of the tubes with nominal diameter (mm) said that the nominal diameter is the diameter of the approximation. The habit usually expressed in inches, such as 11/2 and so on.
Ordinary carbon steel wire casing (GB3640-88) industrial and civil buildings, installation of machinery and equipment and other electrical installation work for the protection of wire and steel pipe.
4 straight seam welded steel pipe (YB242-63) is parallel to the longitudinal weld and steel pipe steel pipe. Usually divided into metric welded steel pipe, welding thin-walled tube, transformer cooling tubing.
Pressure fluid conveying tube with spiral submerged arc welded steel pipe (SY5036-83) is a hot-rolled steel strip coils, often warm spiral shape double submerged arc welding for pressure fluid transmission spiral pipe joints. Steel bearing ability, good welding performance, a variety of rigorous scientific examination and testing, the use of safe and reliable. Steel pipe caliber, transmission efficiency, and can save the laying of pipeline investments. Mainly used for transporting oil, natural gas pipeline.
Pressure fluid conveying high-frequency welded steel pipes with spiral (SY5038-83) tube is hot-rolled steel strip coils, often warm spiral shape, frequency lap welding welding, for the pressure fluid transportation spiral high-frequency welded steel pipe. Bearing capacity of steel pipe, plastic welding and machining molding; a variety of strict and scientific inspection and testing, the use of safe and reliable, large diameter steel pipe, transmission efficiency, and save the laying of the pipeline investment. Mainly used for laying the pipeline transport oil and natural gas.
Low pressure fluid conveying spiral submerged arc welded steel pipe (SY5037-83) is hot-rolled steel strip coils for tube, often warm spiral shape, using double-sided automatic submerged arc welding or single-sided welding into the legal system for water , gas, air and steam, low pressure fluid using the submerged arc welded pipe.
Low pressure fluid conveying high-frequency welded steel pipe (SY5039-83) is a hot-rolled steel strip coils for tube with spiral, often warm spiral shape, welded with high frequency lap welding method for the low pressure fluid transfer with spiral high-frequency welded steel pipe.
9. Pile for the tube, spiral welded steel pipe (SY5040-83) is a hot-rolled steel strip coils, often warm spiral shape, made of double-sided submerged arc welding or high frequency welding for the civil construction structures, docks, bridges, etc. The foundation piles with steel pipes.
Fourth, the plastic composite pipe, large diameter coated steel pipe
Plastic composite pipe, hot dip galvanized steel substrate, the outer wall can also be in the wall (when needed) coated plastic made by the powder melting spray performance. Compared with galvanized pipe, with the advantages of corrosion-resistant, not rust, not fouling, smooth, smooth and clean non-toxic, long life. According to three times of testing, the service life of plastic composite pipe for galvanized pipe. Compared with the plastic tube, with a high mechanical strength, pressure resistance, heat resistance, etc.. As the substrate is a steel pipe, so there is no embrittlement problem of aging. Can be widely applied to water, gas, chemical products, such as fluid transport and heating project is the upgrading of products galvanized pipe. Pipe market due to its installation method is basically the same as with traditional galvanized pipe, pipe fitting forms are identical, and can replace the plastic composite pipe on the transportation of large diameter water play a role welcomed by users, has become the most competitive one of the new products.
Coated steel pipe is made in a plastic coating on the basis of large-diameter spiral welded pipe and high-frequency welded pipe, the maximum nozzle diameter up to 1200mm, according to different needs coated with polyvinyl chloride (PVC), polyethylene (PE), the epoxy (EPOZY) and other variety of different properties of the plastic coating, good adhesion, corrosion resistance, can be resistant to acid, alkali and other chemical corrosion, non-toxic, does not rust, wear resistance, impact resistance, resistance to penetration strong, smooth pipe surface will not adhere to any substance, can reduce the transmission of resistance, increase traffic and transport efficiency, reduce the delivery pressure losses. Solvent-free coating, no oozing substance, and thus will not the transmission medium of pollution in order to ensure the purity and health of the fluid at -40 ℃ to +80 ℃ range of thermal cycles used interchangeably, not aging. no cracks, and thus can be used in the cold zone and other harsh environment.
The large diameter coated steel pipes are widely used in tap water, natural gas, petroleum, chemical, pharmaceutical, telecommunications, power, marine and other engineering fields.