|
Pipe is a hollow steel strip, a large number of channels for transporting fluids such as oil, gas, water, gas, steam, etc. In addition, practice bending, torsional strength of the same lightweight, it is also widely for the manufacture of mechanical parts and engineering structures. Also used in producing all kinds of conventional weapons, the barrel, shells and so on.
Classification of Steel: Seamless and welded steel points (pipe joints) two categories. By cross-section shape can be divided into tube and shaped tubes, round steel is widely used, but there are some square, rectangular, semi-circular, hexagon, equilateral triangle, octagon and other special-shaped pipe.
For steel to withstand the pressure of fluid hydraulic pressure test should be conducted to test the capacity and quality of its pressure, the provisions do not leak under pressure, wet or expanded qualified, some steel Haiyaogenju standard or demand side, curling test requirements , flaring test, flattening tests.
Seamless: seamless steel pipe or solid steel ingot is made of the capillary tube by the piercing, and then by hot rolling, cold rolling or cold call is made. Specifications of seamless steel pipe with outer diameter * thickness mm numbers. Hot-rolled and cold rolled seamless steel pipe points (allocated) seamless two.
Hot-rolled seamless steel tube sub-normal, low, medium pressure boiler pipe, high pressure boiler steel pipe, steel pipe, stainless steel pipe, oil cracking pipe, steel and other steel and other geological.
Cold (allocated) Subject to sub-normal steel seamless steel pipe, low and medium pressure boiler pipe, high pressure boiler steel pipe, steel pipe, stainless steel pipe, oil cracking pipe, other steel, but also including Carbon Steel Tube, Alloy Steel Tube, thin wall stainless steel pipe, shaped steel.
Hot rolled seamless tube outer diameter generally greater than 32mm, wall thickness 2.5-75mm, cold-rolled seamless steel pipe diameter can go to the Department 6mm, wall thickness can be 0.25mm, outer diameter thin-walled tube to 5mm thickness can be less than 0.25mm , cold than hot-rolled high dimensional accuracy.
Seamless steel pipe for general use is 10,20,30,35,45 and other quality carbon structural steel 16Mn, 5MnV low-alloy structural steel or 40Cr, 30CrMnSi, 45Mn2, 40MnB, etc. All structural steel made of hot-rolled or cold rolled. 10,20 and other low-carbon steel is mainly used for manufacturing of seamless pipes fluid. 45,40 Cr, etc. made of carbon steel seamless pipe used in the manufacture of mechanical parts, such as cars, tractors and the force components. Seamless steel pipe for general use to ensure strength and flattening test. Hot-rolled steel with hot-rolled state or heat treatment delivery; cold to hot to heat treatment delivery. Low and Medium Pressure Boiler Seamless Steel Tubes: used to manufacture a variety of low and medium pressure boilers, superheated steam pipes, boiling water pipe, water wall tubes and superheated steam locomotive boiler tubes, opium pipe, tobacco pipe and a small brick arch tubes.
With high-quality hot-rolled or cold-rolled carbon structural steel (call) seamless. 10,20 No. steel is mainly used, in addition to chemical composition and mechanical properties to ensure things do pressure test, crimping, flaring, flattening test, etc. State of delivery hot rolled to hot rolled, cold-rolled (allocated) to heat treatment delivery.
High-pressure boiler steel pipe: mainly used to manufacture high-pressure and more pressure steam boiler tubes, etc. with high quality carbon structural steel, alloy steel and heat-resistant stainless steel seamless pipe, the boiler tubes at high temperature and high pressure by the party to work tubes in high temperature gas and water vapor will occur under the action of oxidation and corrosion, thus requiring a durable steel pipe with high strength, high oxidation resistance, and good organizational stability, use of steel: high quality carbon structural steel steel with 20G, 20MnG, 25MnG; alloy steel steel 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB etc.; a rust resistant steel used 1Cr18Ni9, 1Cr18Ni11Nb Apart from ensuring high-pressure boiler tubes chemical composition and mechanical properties , the hydraulic pressure test should be done by the root, to be flaring, flattening test. Steel to heat treatment delivery. In addition, finished steel microstructure, grain size, there are certain requirements decarburization layer. Geological drilling and oil drilling control with seamless; In order to investigate underground rock structures, water, oil, gas and mineral resources, use of drilling rigs. Oil, natural gas can not do without drilling, geological drilling oil drilling with seamless control is the main drilling equipment, including core outer tube, core tube, casing, drill pipe and so on. As the drilling pipe to work deep into the depth of several kilometers formation, working conditions are complex, drill pipe to withstand tension, compression, bending, torsion and impact loading such as uneven stress, but also by mud, rock wear, therefore, required pipe must have sufficient strength, hardness, wear resistance and toughness, steel pipe with "DZ" (Geology of the Chinese Phonetic Alphabet prefix) plus a representative number of yield point of steel that the steel used has DZ45 of 45MnB, 50Mn; DZ50 of 40Mn2, 40Mn2Si; DZ55 the 40Mn2Mo, 40MnVB; DZ60 the 40MnMoB, DZ65 the 27MnMoVB. Steel to heat treatment are delivered. Oil cracking tube: for oil refinery furnace tubes, heat exchanger tubes and pipes used seamless. Common quality carbon steel (10,20), steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti) manufacturing. In addition to steel may permit the chemical composition and mechanical properties of all kinds, but also ensure the water pressure, flattening, flaring and other tests, and surface quality, and nondestructive testing. Pipe under the heat treatment delivery. Stainless steel tube: stainless steel with a variety of hot and cold rolled stainless steel pipe, widely used in petroleum, chemical equipment, stainless steel pipes and structural components for various purposes, with the exception of the chemical composition and mechanical properties, where the fluid pressure steel pipe used to bear pressure test to ensure compliance. All kinds of special steel in accordance with the provisions of guarantee conditions.
Welded steel pipe: also called pipe, is to use steel or steel through bending, and then made by welding. Divided by the form of Longitudinal and spiral weld pipe.
Divided into general-use pipe, galvanized pipe, blowing oxygen pipe, wire and tube, metric pipe, roller tube, deep well pipes, automotive tube, transformer tube, welding tube, welding special section tube and spiral welded pipe.
General Pipe: General pipe used to transport low pressure fluid. With Q195A, Q215A, Q235A steel. Can be applied easily to other soft steel welding. Pipe to conduct water pressure, bending, flattening and other experiments on the surface of a certain quality requirements, delivery is usually the length of 4-10m, frequently asked Length (or double length) delivery. Specifications with the nominal pipe diameter, said (mm or inches) nominal diameter and the actual different pipe wall thickness required of ordinary steel and two thicker steel, steel pipe end in accordance with the form is divided into two threads and without threads Table 6-17 for the welded steel pipe size. Table 6-17 low pressure liquid delivery welded steel pipe (according to GB/T3092-93) nominal bore diameter of ordinary steel pipe thick nominal size mm mm in wall thickness tolerances theoretical weight kg / m thickness of theoretical weight kg / m nominal size mm to allow deviation% nominal size mm Tolerance % 6 1 / 8 10.0 +0.50 mm-0.50mm 2.00 +12 -15 0.39 2.50 +12 -15 0.46 8 1 / 4 13.5 2.25 0.62 2.75 0.73 10 3 / 8 17.0 2.25 0.82 2.75 0.97 15 1 / 2 21.3 2.75 1.26 3.25 1.45 20 3 / 4 26.8 2.75 33.5 1.63 3.50 3.25 2.42 2.01 251 4.00 2.91 32 11 / 4 42.3 3.25 3.13 4.00 3.78 40 11 / 2 48.0 3.50 3.84 4.25 4.58 50 2 60.0 +1% 1% 3.50 4.88 4.50 6.16 6521 / 2 75.5 3.75 88.5 6.64 4.50 7.88 803 4.00 8.34 4.00 4.75 9.81 100 4 114.0 140.0 10.85 5.00 13.44 1255 4.00 13.42 5.50 18.24 1506 165.0 21.63 4.50 17.81 5.50
With the welded steel pipe technology to enhance and improve the processing is simple, and now instead of part of the seamless pipe welded pipe, welded steel pipe is capable of producing 219mm (8 inches) or more.
Galvanized steel: To improve the corrosion resistance of steel pipe, the ordinary steel (clarinet) for zinc. Galvanized steel sub-zinc galvanized steel and two kinds of electric, hot dip galvanized zinc thickness, electro-galvanized and low cost.
Oxygen blowing pipe: used for blowing oxygen steel pipe, generally with small diameter welded steel pipes, size from 3 / 8 inch -2 inch eight. With 08,10,15,20 or Q195-Q235 steel is made. To corrosion, and some were aluminized.
Wire Casing: general carbon steel welded pipe is used in a variety of structural concrete and distribution projects, commonly used nominal diameter from 13-76mm. Thin wall wire condom, mostly carried out after the use of coated or galvanized, cold test requirements.
Metric pipe: seamless form with specifications, using OD * mm wall thickness, said the welded steel pipe, with ordinary carbon steel, quality carbon steel or low alloy steel common to the tropical, cold with welding, soldering or tropical made after the cold call approach.
Metric universal energy and thin-walled welded points, common for structural parts, such as the drive shaft, or transmission fluid, thin to produce furniture, lamps, etc., to ensure that steel strength and bending test.
Roller tube: welded steel pipe for belt conveyor idlers, the general use of Q215, Q235A, B steel and 20 steel, diameter 63.5-219.0mm. Curvature of the tube, end with the vertical axis, ellipticity certain requirements, ordinary pressure and flattening test.
Transformer control: for the manufacture of transformers and other heat pipe heat exchanger, the ordinary carbon steel, require flattening, flaring, bending, hydraulic pressure test.
Length or double length pipe to delivery pipe camber on certain requirements. Special section tube: Results from the ordinary carbon structural steel and 16Mn steel welding system such as square tube, rectangular tube, cap-shaped pipe, empty plastic steel doors and windows with steel, mainly for agricultural machinery components, steel window doors.
Welded thin-walled tube: mainly used to make furniture, toys, lamps and so on. In recent years, thin-walled tube made of stainless steel with a very wide application, fine furniture, decoration, fencing and so on. Spiral welded pipe: carbon steel is low carbon or low alloy steel strip at a certain point of the spiral line (called the forming angle) rolled tube, and then seam welded pipe made of, it can narrow The production of large diameter steel strip. Spiral welded pipe is mainly used for oil and gas pipelines, its specifications with diameter * wall thickness, said. Spiral welded pipe and welding a single-sided welding, pipe pressure test should ensure that the weld tensile strength and the forming performance to meet the requirements.
|
Steel Pipe 
TOP