One, the classification Pipe
One, by classification production methods
    (1) Seamless Steel Tube - the hot, cold-rolled tubes, tube drawing, extruded pipe, pipe-jacking
    (2) Pipe
    (A) Based on the technology - arc welded pipe, resistance welding tube (high-frequency, low-frequency), gas pipe, pipe furnace
    (B) the weld points - longitudinally welded pipe, spiral pipe
2, the section shape classification
    (1) Section simple pipe - circular pipe, square steel pipe elliptical, triangular steel pipe hexagon, diamond pipe, pipe-shaped anise, semi-circular steel circle, other
    (2) Section Pipe complex - equilateral hexagonal steel pipe five cinquefoil, pipe-convex, concave-pipe, pipe-shaped melon seeds, conical steel bellows-shaped pipe, pipe crust, the other three, classified by thickness - thin-walled pipe, thick-walled pipe
4, the use classification - Pipeline steel pipe thermal equipment, machinery industrial pipe, oil, using geological drilling pipe, pipe containers, chemical industrial steel pipe for special purposes, other
2, welded pipe standards
    Welded Pipe also said pipe is the use of steel or strip after forming a curly made of welded steel pipe. Pipe welding production process is simple, high efficiency, different specifications, equipment financing small, but the general strength seamless steel pipe. Since the 1930s, with high quality strip rolling and the rapid development of welding and testing technological progress, continually raising the quality of welding and welding pipe specifications varieties growing, and more and more areas instead of seamless steel pipe. By welded steel pipe weld in the form into longitudinally welded pipe and spiral welded pipe.
Simple longitudinally welded pipe production technology, production of high efficiency, low cost, rapid development. The general strength of spiral welded pipe than longitudinally welded pipe, use narrower billet production of larger diameter pipe, but also with the same blank width of the production of different pipe diameters. But with the same length of straight pipe joints compared to weld length of 30 ~ 100% increase, but lower production rate.
Therefore, most small-diameter pipe used straight seam welding, large-diameter pipe used most of spiral welded.
    1. Low-voltage transmission fluid Welded Steel Pipe (GB/T3092-1993) also said that the general pipe, commonly known as the clarinet. Transportation is for water, gas, air and steam, heating oil and the generally low pressure fluid and other uses welded steel pipe. Then pipe wall thickness and pipe into ordinary thicker tube; Takeover-form into a non-Steel Tube (tubes) and the Steel Belt. The specifications of the steel pipe with that caliber (mm), the diameter of that caliber is an approximation. The habit of common-said that if 11 / 2,. Low-voltage transmission fluid used for welding pipe in addition to direct transmission fluid, but also for the large number of low-pressure fluid delivery with galvanized steel pipe welding of the original.
    2. Low-voltage transmission fluid Galvanized steel pipe welding (GB/T3091-1993) also said galvanized welded steel pipe, commonly known as white tube. Transportation is for water, gas, air heating oil and steam, heated and generally low pressure fluid or other uses hot dip galvanized welded (furnace welding or welding) pipe. Pipe wall thickness then divided into ordinary galvanized steel pipe and thicker galvanized pipe; Takeover-form into a non-threaded with galvanized steel pipe and threaded galvanized pipe. The specifications of the steel pipe with that caliber (mm), the diameter of that caliber is an approximation. The habit of common-said that if 11 / 2,.
    3. Ordinary carbon steel wire casing (GB3640-88) is the industrial and civil construction, equipment installation and the installation of electrical wires for the protection of the pipe.
    4. Longitudinal welded steel pipe (YB242-63) is parallel longitudinal weld pipe and tubes. Usually into the metric system welded steel pipe and tube welding transformer cooling tubing, and so on.
    5. Fluid pressure screw conveyor SAW pipe joints (SY5036-83) is a hot strip Vol tube, often spiral-shaped, with double-submerged arc welding method for the transmission of fluid pressure spiral pipe joints. Strong pressure pipe welding performance and a variety of strict scientific examination and testing, the use of safe and reliable. Pipe diameter, high transmission efficiency, conservation and the laying of pipeline investment. Mainly used for transportation of oil and gas pipelines.
    6. Transmission fluid pressure with high frequency spiral welded pipe joints (SY5038-83) is a hot strip Vol tube, often spiral-shaped, using high-frequency welding lap welding method for the transmission of fluid pressure of high frequency spiral welded steel pipe joints. Strong pressure pipe, plastic, welding and processing ease of molding; After all strict and scientific examination and testing, the use of safe and reliable, pipe diameter, high transmission efficiency, and save the laying of pipeline investment. Major transportation for the laying of oil and gas pipelines, etc..
    7. Generally low-pressure fluid transmission with helical submerged arc welding pipe joints (SY5037-83) is a hot strip Vol tube, often spiral-shaped, using single or double-sided automatic submerged arc welding into the legal system for water, gas, air and steam, with the general low-voltage transmission fluid SAW pipe.
    8. Generally low-pressure fluid transmission with high frequency spiral welded pipe joints (SY5039-83) is a hot strip Vol tube, often spiral-shaped, using high-frequency welding lap welding method for general low-voltage transmission fluid with high frequency spiral welded steel pipe joints.
    9. Piles with spiral weld pipe (SY5040-83) is a hot strip Vol tube, often spiral-shaped, double-submerged arc welding or using high-frequency welding made for the civil structures, piers, bridges and other infrastructure used pipe pile.
2, seamless steel pipe standards
With a hollow cross section, not peripheral joints of the long steel products. A hollow steel tube sections, large transmission fluid for the pipeline, such as the transportation of oil, gas, gas, water and certain pipeline and other solid materials. Pipe and solid steel bar, compared to the bending of the torsional strength, lighter weight, is an economic cross-section steel, widely used in the manufacture of structural and mechanical parts, such as oil drill pipe, automotive transmission, as well as 4,000 construction using steel scaffolding. Using circular pipe manufacturing parts, improve material utilization and simplify the manufacturing process, saving time and processing materials, such as rolling bearings Ring, Jack sets, has been widely used to manufacture pipe. Various pipe or conventional weapons indispensable material, barrel, the barrel of the cannon, to be pipe manufacturing. Pipe-shaped by different cross-sections can be divided into pipe and tube. As in circumference under the same conditions, round largest circular tube can be used more transmission fluid. In addition, Circle section was under internal or external radial pressure, force more evenly, it is the overwhelming majority of tube pipe.
    However, the pipe has some limitations, such as the plane bending conditions, the better side on the tube, rectangular tube bending strength, some Farm Implements frames, wood furniture on the popular side of the rectangle. According to different uses also other forms of profiled steel tube sections.
    1. Seamless pipe structure (GB/T8162- 1999) is for general structure and the mechanical structure of seamless steel pipe.
    2. Seamless pipe transmission fluid (GB/T8163-1999) was used to transport water, oil, gas and other fluids generally seamless steel pipe.
    3. Low pressure in the boiler Seamless Steel Tube (GB - 1999) is used in the manufacture of various structures in the low-pressure steam boiler superheater tube, boiling water pipes and superheated steam locomotive boiler tubes, cut the small brick arch pipe and effective quality hot-rolled carbon steel and cold finished (rolling) Seamless Steel Tube.
    4. High-pressure boiler Seamless Steel Tube (GB5310-1995) is used in the manufacture of high-pressure and more pressure boiler heating surface of the pipes with high quality carbon steel, stainless steel and heat-resistant steel seamless steel pipe.
    5. Fertilizer equipment with high pressure seamless steel pipe (GB6479-2000) is applicable to a temperature range of -40 to 400 ° C, pressure for 10 ~ rocks chemical equipment and pipeline quality carbon steel and alloy steel seamless steel pipe.
    6. Seamless pipe oil cracking (GB9948-88) is applicable to the oil refinery furnace tubes, seamless tube and pipe heat exchangers.
    7. Geological Drilling Pipe (YB235-70) is a core sector for geological drilling pipe used by use can be divided into the drill pipe, drill collar, the core tube, pipe, casing and precipitation.
    8. Diamond Core Drilling Seamless Steel Tube (GB3423-82) is used for diamond core drilling of drill pipe, at core, the seamless steel pipe casing.
    9. Oil drilling tube (YB528-65) is used for oil drilling at both ends of the thickening or thickening of the Seamless Steel Tube. Pipe-wire cars and two trucks silk, silk effective joint association cars, trucks silk effective methods and tools welded joints link.
    10. Ship with carbon steel seamless steel pipe (GB5213-85) is the manufacture of pressure vessels of Class I, II-pressure piping, boiler and overheating Used for the carbon steel seamless steel pipe. Carbon steel seamless steel pipe wall temperature does not exceed 450 ° C, the alloy steel seamless steel pipe wall temperature over 450 ° C.
    11. Car Semiaxle seamless pipe casing (GB3088-82) in the manufacturing and automobile axle shaft drive casing Bridge shell axis effective quality carbon steel and alloy steel hot-rolled seamless steel tube structure.
    12. Diesel high-tubing (GB3093-2002) is to create high-pressure diesel injection system unworkable drawing Seamless Steel Tube.
    13. Hydraulic and Pneumatic cylinder diameter seamless tube with precision (GB8713-88) is the manufacturer of hydraulic and pneumatic cylinder with a diameter the size of a sophisticated drawing or cold precision seamless tube.
    14. Drawing or cold precision seamless tube (GB3639-2000) is used for mechanical structure, the size of hydraulic equipment and high precision surface finish good drawing or cold precision seamless tube.
Selection of seamless steel pipe manufacturing precision mechanical structure or hydraulic equipment, which can greatly save machining time, improve material utilization, and to improve product quality.
    15. Seamless steel tube with stainless steel structure (GB/T14975-2002) is widely used in chemical industry, petroleum, textile, medical, food, industrial machinery, pipes and corrosion resistance and structural components made of hot-rolled stainless steel (crowded, expanding) and drawing (rolling) Seamless Steel Tube .
    16. Fluid transport stainless steel seamless steel pipe (GB/T14976-2002) for the transmission fluid is made of hot-rolled stainless steel (crowded, expanding) and drawing (rolling) Seamless Steel Tube.
    17. Seamless steel tube is profiled in addition to other than the pipe cross-section shape of the Seamless Steel Tube Said. The shape and size of the pipe section can be divided into different thickness and profiled Seamless Steel Tube (codenamed D), profiled seamless steel pipe wall thickness ranges (codenamed BD), variable diameter profiled Seamless Steel Tube (codenamed BJ). Shaped seamless steel tubes used in various structural parts, tools and machinery parts. Pipe and compared tube are generally larger moment of inertia and section modulus, bending torsional larger capacity, which can greatly reduce the structural weight, save steel.
Steel-plastic composite pipe, large diameter pipe coating
    Steel-plastic composite pipe to hot dip galvanized steel pipe for Matrix, melt the powder spraying technology in the wall (wall also necessary) from plastic coating performance excellence. Compared with the galvanized pipe with corrosion-resistant, not rust, fouling, smooth smooth, clean non-toxic, long service life, etc. According to tests, steel-plastic composite pipe for the life of galvanized pipe more than three times. Compared with the plastic pipe, a high mechanical strength, pressure, heat and good benefits. The matrix is the pipe, so there is no brittle, aging. Tap water can be widely used, gas, chemical products and fluid transport and heating project is the upgrading of galvanized products. Since its installation with the traditional method essentially the same as galvanized pipe, tube form identical, but instead of aluminum-plastic composite pipe in large diameter water transmission on the role of 1W, the market has become the most competitive pipeline of new products one.
    Coated in large-diameter steel pipe spiral welded pipe and high frequency welded pipe plastic coating on the basis of the result of the biggest mouth diameter of 1200mm, according to the different needs of coated polyvinyl chloride (PVC), polyethylene (PE), epoxy resin (EPOZY) and the various properties of plastic coating, good adhesion , anti-corrosion, resistant acid, alkali and other chemical etching, non-toxic, non-corrosion, abrasion resistance, impact resistance, penetration - resistant pipeline smooth surface, adhesion any material, the transmission can be reduced resistance to flow and improve transportation efficiency, reduce transportation pressure loss. The solvent-free coating, it is undeniable leaking material, which will not be contaminated by the carrier medium, thus ensuring the purity of the fluid and health, -40 ° C to +80 ° C of thermal cycles can be used interchangeably, aging, cracking, which could in the cold zone, the use of harsh environment .
    Large Diameter Pipe Coating widely used tap water, gas, oil, chemicals, pharmaceuticals, telecommunications, power, marine and engineering fields.