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First, the classification of steel pipe
1 Classification according to production methods
(1) seamless steel pipe - hot rolled pipes, cold rolled tubes, cold drawn tubes, extruded pipe, pipe jacking
(2) pipe
(A) by technology - from electric arc welded pipe, resistance welding pipes (high-frequency, low frequency), gas pipe, stove pipe
(B) by weld points - straight seam welded pipe, spiral welded pipe
2, shape classification by cross section
(1) simple cross section steel - round tube, square tube, oval tube, triangle tube, hexagon steel, diamond steel, octagonal-shaped steel, semi-circular steel round, other
(2) complex section steel - scalene hexagonal steel pipe, five plum-shaped steel tube, steel double convex, double concave steel, melon-shaped steel tube, conical steel pipe, corrugated steel pipe, steel case, other
3, classified according to thickness - thin-walled steel pipe, thick wall steel pipe
4, classified by use - with a steel pipe, steel pipe thermal equipment, machinery and industrial steel, petroleum, geological drilling steel, container steel, chemical, industrial pipe, special-purpose steel, other
2, seamless steel pipe standards
Is a kind of hollow cross section, no seams around the steel strip. Hollow section steel pipe with a large number of channels for transporting fluids, such as the transportation of oil, natural gas, gas, water and some solid materials, pipes, etc.. Solid steel pipe and round bar, etc. compared to the same torque strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture structural parts and mechanical parts, such as drill pipe, automotive transmission, bike frame and steel building construction using scaffolding. Ring with a steel pipe manufacturing parts, can improve material utilization, simplify the manufacturing process, saving materials and processing man-hours, such as bearing rings, jack sets, etc., has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel would have to steel to make. Tube shape by cross-sectional area can be divided into different tubes and special section tube. Since under the conditions of equal perimeter, the maximum area of a circle with a circular pipe can carry more fluid. In addition, the ring cross section to withstand internal or external radial pressure, the force is uniform, so the vast majority of steel pipe is pipe.
However, the tube also has some limitations, such as by plane bending conditions, the tube on the better side, rectangular tube bending strength, some farm machinery frames, steel and wood furniture on the commonly used square, rectangular tube. Needed for different purposes other shaped cross-section shape steel.
1. Structural Seamless Steel Tube (GB/T8162-1999) is used for general structural and mechanical structure of seamless steel tubes.
2. Seamless steel tubes for fluid transportation (GB/T8163-1999) is used for conveying water, oil, gas and other fluids generally seamless.
3. Low and Medium Pressure Boiler Seamless Steel Tubes (GB3087-1999) is used in the manufacture of various structural low and medium pressure boiler superheated steam pipes, boiling water pipes and superheated steam locomotive boiler tubes, opium pipe, small pipe and brick arch useful high-quality carbon structural steel hot-rolled and cold drawn (rolled) seamless.
4. High-pressure boiler seamless pipe (GB5310-1995) is used to manufacture high-pressure and more pressure on the water boiler heating surface with high-quality carbon steel, alloy steel and heat-resistant stainless steel seamless pipe.
5. Fertilizer equipment high pressure seamless steel pipe (GB6479-2000) is applicable to operating temperature -40 ~ 400 ℃, working pressure of 10 ~ 30Ma of chemical equipment and pipeline quality carbon structural steel and alloy steel seamless steel tubes.
6. Petroleum Cracking Seamless Steel Tubes (GB9948-88) is applied to the oil refinery furnace tubes, heat exchangers and pipe seamless steel pipe.
7. Geological Drilling Pipe (YB235-70) is for the use of the geological department of the steel core drilling, can be divided by use of drill pipe, drill collars, cores, sleeves and precipitation tubes.
8. Diamond core drilling Seamless (GB3423-82) for diamond core drilling drill, core rods, seamless steel casing.
9. Oil drilling pipe (YB528-65) is used to thicken the oil drilling within or outside the thick ends of the seamless steel tubes. Steel wire and non-sub-car wire two car, car connector wire useful links, not threading methods and tools useful butt joint connection.
10. Ship carbon steel seamless pipe (GB5213-85) is the manufacture of pressure vessels piping grade I, Ⅱ grade pressure piping, boilers and Superheater carbon steel seamless pipe. Carbon steel seamless pipe wall temperature does not exceed 450 ℃, alloy steel seamless steel pipe wall temperatures in excess of 450 ℃.
11. Automobile axle casing seamless pipe (GB3088-82) is the manufacture of automobile axle tube and axle shaft axle useful high-quality carbon structural steel and alloy steel hot-rolled seamless steel tubes.
12. Diesel high pressure oil pipe (GB3093-2002) is to create high-pressure diesel injection system useful in the cold drawn seamless steel tubes.
13. Hydraulic and pneumatic cylinder seamless steel with precision internal diameter (GB8713-88) is a manufacturer of hydraulic and pneumatic cylinder with a diameter size with precision cold drawn or cold rolled precision seamless steel tubes.
14. Drawn or cold rolled precision seamless steel pipe (GB3639-2000) is used for mechanical structure, hydraulic equipment, high dimensional accuracy and surface finish of a good cold-drawn or cold rolled precision seamless steel tubes.
Use precision seamless steel pipe manufacturing equipment, mechanical or hydraulic structure can be significant savings in machining time while improving material utilization, and help to improve product quality.
15. Stainless steel seamless tubes (GB/T14975-2002) is widely used in chemical, petroleum, textile, medical, food, machinery and other industries, corrosion-resistant pipe and structural parts and components made of hot rolled stainless steel ( extrusion, expansion) and cold drawn (rolled) seamless.
16. Fluid transport stainless steel seamless pipe (GB/T14976-2002) is used for the transmission fluid made of hot-rolled stainless steel (extrusion, expansion) and cold drawn (rolled) seamless.
17. Shaped seamless steel tube is in addition to other than the general cross-section shape of seamless steel tubes. By steel cross-section shape and size can be divided into different shaped seamless steel pipe wall thickness, etc. (code-named D), ranging from shaped seamless steel pipe wall thickness (code-named BD), variable diameter shaped seamless steel pipe (code-named BJ). Shaped seamless steel pipe used in a variety of structural parts, tools and mechanical parts. And the tube compared to special section tube generally larger moment of inertia and section modulus, a larger bending and distorting ability, can significantly reduce the structural weight, saving steel.
3, welded steel pipe standards
Also known as welded steel pipe, steel plate or strip is formed through the coil made of steel after the welding. Welded steel pipe manufacturing process is simple, high efficiency, variety specifications, equipment, less capital, but the general strength of less than seamless. 30 Since the 20th century, with high-quality rapid development of strip rolling, and welding and inspection technology, continuously improving weld quality, welded steel pipe specifications increasing and more and more areas to replace the non- seam steel pipe. Welded steel pipe weld in the form of divided by Longitudinal and spiral welded pipe.
Longitudinal production process is simple, high efficiency, low cost, rapid development. Spiral Welded Longitudinal higher than the strength of the general, can use a narrow large diameter pipe billet production, but also the width of the blank with the same production of different pipe diameters. But with the same length of straight seam pipe than the weld length of 30 ~ 100%, and lower production rate.
Therefore, the smaller diameter of the pipe were powered by straight seam welded, large diameter spiral welded pipe is mostly used.
1. Low pressure liquid delivery welded steel pipe (GB/T3092-1993), also known as general welded pipe, commonly known as the clarinet. Is used to transport water, gas, air, steam, oil and heating generally low pressure fluid and welded steel tubes for other purposes. Then divided into ordinary steel pipe wall thickness and thicker steel; take over the side into the form of non-threaded steel pipe (tubes) and with a threaded steel pipe. Specifications with the nominal pipe diameter (mm) that the nominal diameter is the diameter of the approximation. Traditionally used inch that if the 11 / 2 and so on. Welded steel tubes for low pressure liquid delivery in addition to direct for the transport of fluids, but also a large number of low-pressure fluid used for the conveyance of the original galvanized welded steel pipe.
2. Low pressure liquid delivery galvanized welded steel pipe (GB/T3091-1993), also known as galvanized welded steel pipe, commonly known as white tube. Is used to transport water, gas, air-oil and heating steam, warm water and other fluids, or other general purpose low pressure hot-dip galvanized welding (furnace brazing or welding) pipe. Then divided into ordinary steel pipe wall thickness of galvanized steel and thicker galvanized steel; take over the side into the form of non-threaded galvanized steel pipe and galvanized steel pipe with threads. Specifications with the nominal pipe diameter (mm) that the nominal diameter is the diameter of the approximation. Traditionally used inch that if the 11 / 2 and so on.
3. Ordinary carbon steel wire pipe (GB3640-88) is the industrial and civil construction, installation of machinery and equipment used to protect electrical installations in the steel wires.
4. Straight seam welded steel (YB242-63) is parallel to the longitudinal weld steel pipe with steel pipe. Usually divided into metric welded steel pipe, welded tube, transformer cooling oil pipe, etc..
5. Pressurized fluid transport spiral submerged arc welded pipe (SY5036-83) is a volume for hot rolled steel tube, often warm spiral shape, with double-sided submerged arc welding method for fluid transport in the spiral pressure seam steel pipe. Strong pressure steel pipe, welding performance, through a variety of rigorous scientific testing and testing, safety and reliability. Large diameter steel pipe, transmission efficiency, and saving investment to construct the pipeline. Mainly used to transport oil, natural gas pipelines.
6. Pressurized fluid transport Spiral Welded Steel Pipe (SY5038-83) is a volume for hot rolled steel tube, spiral shape often temperature, high frequency welding of lap welding method for conveying pressure fluid Spiral Welded Steel Pipe. Strong pressure steel pipe, plastic, and easy welding and metal forming; through a variety of strict and scientific examination and testing, use of safe, reliable, large diameter steel pipe, transmission efficiency, and can save investment to construct the pipeline. Mainly used for laying of transmission oil, natural gas pipeline.
7. Generally low pressure liquid delivery of Spiral Welded Steel Pipe (SY5037-83) is a volume for hot rolled steel tube, often warm spiral shape, with double-sided automatic submerged arc welding or welding into the legal system for water , gas, steam, air, and the general low pressure liquid delivery pipe submerged arc welding.
8. Generally low pressure liquid delivery Spiral Welded Steel Pipe (SY5039-83) is a volume for hot rolled steel tube, often warm spiral shape lap welding method using high frequency welding for general low pressure liquid delivery Spiral high frequency welding steel pipe.
9. With spiral weld steel pipe piles (SY5040-83) is a volume for hot rolled steel tube, often warm spiral shape, using double-sided submerged arc welding or high frequency welding made for civil engineering structures, piers, bridges, etc. with steel pipe pile foundation.
4, steel-plastic composite pipe, large diameter steel pipe coating
Steel-plastic composite pipe with hot dip galvanized steel as a matrix, by melting powder coating technology in the wall (where the outer wall can be) made of plastic coated, high performance. Compared with galvanized pipe with corrosion-resistant, not rust, fouling, smooth, smooth, clean and non-toxic, and long life. According to tests, the service life of steel-plastic composite pipe more than three times as galvanized pipe. Compared with the plastic pipe, with high mechanical strength, pressure, and good heat resistance. As the substrate is steel, so there is no embrittlement, aging. Can be widely used in tap water, gas, chemical products, engineering fluid transport and heating, is the upgrading products galvanized pipe. Since its installation and use the same traditional galvanized pipe, pipe fitting forms are identical, and can replace the aluminum-plastic composite pipe in large diameter water transmission play a role, popular with users, has become the most competitive channel market new products.
Coated steel pipe is large diameter spiral welded pipe and high-frequency welded pipe made of plastic coating on the basis of the maximum orifice diameter of 1200mm, can be coated with polyvinyl chloride according to different needs (PVC), polyethylene (PE), epoxy resin (EPOZY) and other plastic coatings of different properties, good adhesion, corrosion resistance, is resistant to acids, alkalis and other chemical corrosion, non-toxic, non-corrosion, wear and impact resistance, resistance to penetration strong pipeline surface is smooth, without any adhesive material, can reduce the transmission time of resistance, increased traffic and transportation efficiency, reduce transportation pressure loss. Solvent-free coating, no leakage of material, which will not pollute the transmission medium, in order to ensure the purity of fluid and health of, in the range of -40 ℃ to +80 ℃ can alternate hot and cold cycle, not aging, not crack, and can in the cold zone and other harsh environments.
Large-diameter coated steel pipe is widely used in tap water, natural gas, petroleum, chemical, pharmaceutical, telecommunications, electric power, marine and other engineering.
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