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Steel Pipe Knowledge
Published:2013-09-28 02:23:06    Text Size:【BIG】【MEDIUM】【SMALL
Summary:Steel Pipe Knowledge

steel pipe is a hollow pipe of long steel products, used for transmitting large fluid channels, such as oil, gas, water, gas, steam, etc., in addition to engaging bending, torsional strength of the same, the lighter weight, So also widely used in the manufacture of mechanical parts and engineering structure. Also used in the production of conventional weapons, a barrel, shells.

Pipe Categories :
Seamless Steel Tube and Pipe-welding steel pipe (a pipe joints) two categories. 

By the shape can be divided into special-shaped tube and pipe, is widely used in the circular pipe, but there are also some square, rectangular, hemicycle, hexagonal, equilateral triangle, the square shape 1.80 pipe.

Fluid pressure to bear for the pipes should be carried out to test hydraulic pressure test their ability and quality, in the no-pressure leak, wetting or qualified for the expansion, Some also based on standard pipe or demand side, demand for beading test, expanding the pilot, squash test. Seamless

Steel Tube : 
Seamless steel tube is solid steel ingot or perforated tube made by the capillary and then hot-rolled, cold-rolled or cold allocation made. Seamless Steel Tube diameter * specifications with a few millimeters of thickness said. Seamless Steel Tube pm Hot and cold (for) two types of seamless steel pipe. Hot Seamless Steel Tube Pipe-general, low-, medium-pressure boiler tube, high-pressure boiler pipe, steel pipe and stainless steel pipe. oil cracking tube, pipe and other geological pipe, etc.. 

Cold (for) Seamless Steel Tube Pipe inter-general, low-pressure boiler tube, high-pressure boiler pipe, steel pipe and stainless steel pipe. cracking of petroleum, other pipe, it also includes the thin carbon steel pipe, the alloy thin-walled steel tube, thin-walled stainless steel tube, pipe abnormal. Hot-rolled seamless tube diameter greater than 32 mm in general, the wall thickness of 2.5-75mm.

Cold Seamless Steel Tube Division Drive to be 6 mm, wall thickness to be 0.25 mm. thin-walled tube diameter can be less than 5 mm wall thickness of 0.25 mm, cold than hot high dimensional accuracy. Seamless general is 10, 20,30,35,45 and other quality carbon steel Guitar 16Mn, 5MnV low alloy structural steel or 40Cr, 30CrMnSi, 45Mn2. Guitar 40MnB such a hot or cold rolled steel manufactured. 10,20, and other low-carbon steel seamless pipes manufactured mainly for fluid pipes. 45,40 Cr made of carbon steel seamless pipes used in the production of machinery parts, such as automobiles, tractor parts of the force.

Seamless general to ensure that the strength and squash test. Hot Hot-rolled steel pipe to a state or heat treatment delivery; Hot to cold to heat treatment delivery. Low-and medium-pressure boiler Seamless Steel Tube : used in the manufacture of various low-pressure boilers, superheated steam pipe, boiling water pipe, waterwall tubes and locomotive boiler superheated steam pipe, opium pipe, pipe tobacco and small brick arch, and so on. Good hot-rolled carbon steel or cold (for) seamless steel pipe. Mainly used 10, 20 steel manufacturing, in addition to guarantees chemical composition and mechanical properties of hydrostatic test to be done outside, curling, expanding, squash experiment. Hot Hot to state delivery, cold-rolled (for) heat treatment delivery.

High Pressure Boiler Tube : 
mainly used for the manufacture of high pressure and more pressure steam boiler tubes, and so on the structural quality carbon steel, alloy structural steel and stainless steel seamless steel pipe heat, Boiler Tube by the party at high temperature and under high pressure, tubes in high temperature flue gas and water vapor will occur under oxidation and corrosion, and therefore require a high pipe lasting strength, The high oxidation resistance, and good organizational stability, steel, are : quality carbon steel, structural steel 20 G, 20MnG, 25MnG; Alloy steel, structural steel 15 MoG. 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG. 12Cr3MoVSiTiB;

Heat-resistant stainless steel is used lCrl8Ni9. 1Cr18Ni11Nb high pressure boiler tube Apart from ensuring the chemical composition and mechanical properties, but also should be done gradually-pressure test, Expanding to make, squash test. Pipe delivery to a state of heat treatment. In addition, the finished steel tube microstructure, grain size, decarbonization layer has a set of requirements. Geological drilling and oil drilling control the use of the pipes; Known for underground rock, underground water, oil, natural gas and mineral resources, the use of drilling rigs. Oil and gas exploration are inseparable from the wells, geological drilling oil drilling control the use of the pipes is the main drilling equipment, mainly outside of the core, the core tube, casing, drill pipe, and so on. As the drilling pipe used to go to work kilometers deep strata, the working conditions are complex, drill pipe under tensile, compressive, flexural, reverse and uneven impact of load stress, but also by mud, rocks wear, therefore, Pipe requirements must have sufficient strength, hardness, wear resistance and toughness.

Steel Pipe "DZ" (geology of the pinyin system prefix) plus a number of representatives of steel yield point, The steel used, the 45MnB a DZ45, 50Mn; DZ50 of 40Mn2, 40Mn2Si; DZ55 the 40Mn2Mo, 40MnVB; upsetting the 40MnMoB. DZ65 the 27MnMoVB. Pipe has to heat treatment delivery. Cracking of oil : oil refinery for the tube, pipe and tube heat exchanger with seamless tube. Common quality carbon steel (10,20), steel (12CrMo, 15CrMo) Heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (lCrl8Ni9. 1Cr18Ni9Ti) manufacturers.

In addition to a pipe certification of various chemical composition and mechanical properties, but also to ensure water pressure, squash, expand export and other tests, and surface quality and nondestructive testing. Pipe under the heat treatment delivery. Stainless steel tube : all stainless steel hot-rolled, cold-rolled stainless steel tube, which are widely used in oil, Chemical Equipment pipelines and various uses of stainless steel structural components, with the exception of chemical composition and guarantees mechanical properties, Where fluid under pressure for the pipe pressure test to ensure that qualified. Pipe according to various special provisions guaranteeing conditions. Welded Pipe : also called pipe, or using steel strip after bending, and then manufactured by welding. Weld into form by Longitudinal and spiral welded pipe. End-use is further divided into general welded pipe, galvanized pipe, oxygen pipe, wires, casings metric pipe, pipe Idler, deep well pump control, auto-control, Transformer pipe, tube welding, welding tube and spiral welded pipe.

General Pipe : general low-pressure pipe for pumping fluid. Q195A use, Q215A, Q235A manufacturers. Can be applied easily to other welding mild steel manufacture. Pipe for pressure, bending, squash and other experiments, the surface of a certain quality, delivery length of the usually 4-10m, Length often asked (or fold feet) delivery.

Pipe with the specifications of the public expressed claimed caliber (mm or inches) nominal diameter and the actual, Pipe wall thickness in accordance with the regulations of ordinary pipe and two pipe thickened, Pipe by the end of another form of zoning and non-threaded screw two, Table 6 -17 for welded pipe size. Table 6 -17 low pressure fluid transmission of welded steel pipe (under GB/T3092-93) nominal diameter aperture ordinary steel mm thicker tube pipe in nominal sizes allow mm thickness deviation theory weight kg / m thickness theoretical weight kg / m public Dimension mm allow deviation% nominal size allows mm deviation%

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