LSAW Steel Pipe

　　API mild steel pipe is widely used in lots of industries. However, a lot of customers still don't know kinds of API steel pipe and their usage. Here we are instroduce you the detail of API steel pipe. 　　 API line steel pipe 　　API line steel pipe is the line pipe that meets the American Petroleum standard. Line pipe is used for transportation of oil, gas and water to the oil and gas industry enterprises. Ends of pipe include plain end, threaded end and socket end; their connections concludes end welding, coupling, socket connections. With the development of technology, API line steel pipe's range of applications is expanding gradually, especially in the large-diameter disaster. Coupled with the factor of cost, welded pipe have a dominant position in the field of line pipe, limiting development of stainless steel seamless line pipe. During 2004, production of seamless line pipe is about 400,000 t, ranging from X42 to X70. 　　API line steel pipe is divided into onshore line...

　 　Classification of welded joints 　　Welded joints is constituted by weld fusion zone, heat affected zone and its adjacent base metal. Welded joints is mainly from two aspects, one is connected to the role, another is power transmission. 　　 Types of pipe welding joints 　　Different welding methods, the welded joints can be divided into welded joints, pressure welding head and brazed joints three categories. The basic types of welded joints can be grouped into five kinds, namely butt joints, T-shaped (cross) joints, lap joints, corner joints and termination connector. 　　Welded joints with groove 　　The docking connector is the ideal joints welded by force, to reduce the consumption of welding deformation and welding materials to ensure the quality of the welding, the edges of the pieces by welders processed into various forms of groove, bevel butt. 　　Depending on its shape, the groove of the welded joints can be divided into basic type, mixed type and special type of three cat...

　 　Scope 　　This standard applies to heat exchangers, condensers and similar heat exchanger and condenser erw carbon steel pipe with a minimum wall thickness. Usually provides steel pipe size outside diameter smaller than 3in (76.2mm), can also provide other dimensions of the tube, these tubes meets all other requirements of this standard. Mechanical performance requirements do not apply to the inner diameter of less than 3.2mm or the thickness is less than 0.015in (0.4mm) of the tube. 　　 Hardness requirements 　　Tube hardness value shall not exceed 72HRB 　　 Surface state 　　The finished steel should not with oxide skin, slight oxide should not be seen as the oxide. 　 　Manufacturing process 　　Carbon steel pipe with a resistance welding process 　　 Heat treatment 　　900 ℃ or higher temperature necessary after a steel pipe by welding heat treatment, followed by air cooling, or cooling in a controlled atmosphere furnace. Cold drawn tubes after a cold drawn by a final make he...

　　When steel yield to a certain extent, due to the internal grain rearrange and its ability to resist deformation increased, although deformation developed rapidly, but it can only be increased as the stress increased, until the stress reaches the maximum value. Thereafter, the ability of steel to resist deformation is significantly reduced, and the large plastic deformation occurs at the weakest point, here specimens sectional rapidly narrow, the phenomenon of necking until fracture. The maximum stress in the steel by pull before breakage. 　　Value (b point corresponding value) referred to as the ultimate strength or tensile strength. Strength limit yield limit is determined by experiment. During the tensile test, the stress reaches a certain value, although no longer increase even slightly, the strain of the test piece continues to grow, and produce significant plastic deformation, as if the material temporarily loses the ability to resist deformation, such the phenomenon known as m...

　　 Steel pipe burst test rig is used in certain specifications of the polymer sheet material (such as the surface of the film, leather, etc.), or a pipe, the inner surface of the container, through the liquid or air to continuously applied pressure to test sample burst when the maximum pressure and get material bursting strength equipment. 　　 Range of applications: 　　Suitable for a variety of automotive hose, hose, air conditioning pipes, automobile assembly pressure, blasting performance test. For various types of pipe burst pressure measurement and pressure-time measurement. Widely used in quality testing unit, a variety of car parts manufacturing unit, product quality inspection station, and other research institutions hose production, research and development and other fields. Pressure test system, by pressurizing the system and control the display system. Pressure system mainly consists of liquid booster pumps, etc., mainly to complete the system by pressing and holding press...

　　In the process of producing high frequency welded pipe, the manufacturer of welded pipe will encounter pipe surface damage, which is the main reason of guide roller and extrusion roll. 　　1, the scratch produced by the guide roller usually occurs on both sides of the high frequency welded pipe, and the scratch characteristics are large and continuous. The reasons include: 　　(1) the height of the guide sleeve is not correct, such as the damage of the guide roller bearing, the guide roller can not control the high frequency welding pipe well, so that the guide sleeve and friction lead to scratch. 　　(2) when the central roll of the guide roller deviates from the high frequency tube production line is too large, the difference between the guide sleeve and the guide roller axis is too large, resulting in scratches on both sides of the high-frequency welded pipe. 　　2. the scratches produced by the high frequency welding extrusion roller mainly occur at the bottom of the high-frequen...

　　High precision cold drawn steel pipe is a new type of high-tech energy-saving product. In recent years, the technology used in the production of precision steel pipes has been widely used in the domestic hydraulic, pressure cylinder, coal mine support (pillar), oil pump pipe, Jack and other manufacturing fields. The high precision cold drawn precision steel pipe is important to popularize the use of saving steel, improving machining efficiency, saving energy, and reducing investment in hydraulic cylinder and cylinder processing equipment. 　　Cold drawing method: producing high-precision cold drawn pipe, compared with traditional cutting technology, the hydraulic cylinder has the following characteristics: 　　(1) the production efficiency is high: the traditional production method of the cylinder with an inner diameter of 420 millimeters and a length of 12 meters is 154 hours, and the cold drawing process takes only 4 minutes. 　　(2) high positive rate: rolling head boring, play a ...

　　Spiral pipe surface quality problems mainly in the surface oxide thick, surface cracking, heavy leather surface, surface mechanical bumps and so on. Hot-rolled carbon steel pipe after completion, after, or cold-rolled steel and then heat treated, will form a layer thick and strong adhesion, high temperature oxide. The presence of oxide steel look not only poor quality, also affect the use of steel, which is the standard are not allowed. Such oxide with the general sandblasting is difficult to remove, to use pickling or mechanical polishing method to clear. 　　Mechanical bruising is the most common quality problems, arising primarily from the production, handling and transportation. Pipe bumps are formed at a structural discontinuities, use is a source of stress concentration, but also chipped sensitive. Compared with crack, mechanical defects bruised outline clear, do not involve injuries metal, so the standard allows some bumps depth exist, but in some of the more sensitive applica...

　　Frequency straight seam resistance welded steel pipe is hot-rolled coil after molding machine, the use of high-frequency current skin effect and proximity effect, so that the edge of the tube is heated to melt under pressure welding to achieve the effect of squeezing rollers produced. 　　Straight seam electric resistance welded pipe and seamless pipe has the following advantages: 　　A) high dimensional accuracy. Than the diameter welded steel pipe and seamless steel pipe wall thickness variation is much smaller, because the steel rolling and pipe forming easy to control, so the high dimensional accuracy. 　　B) good mechanical properties. Since the pipe is easy to control with the strip rolling line with the development of welding technology and heat treatment technology, the weld properties can be controlled, so straight seam electric resistance welded steel pipe elongation of 8% -10% higher than seamless steel tubes, which because straight seam welded carbon overcast about 12% l...

　　The first mode of production: the tube (plate, belt) molded directly welded into the pipe, the main steps of the strip forming, welding, sizing. Features: less production processes, engineering process is simple, short production cycle, product accuracy is slightly lower. 　　The second mode of production: the tube (plate, belt) first formed directly welded into a certain size pipe, then through the cold-drawn or cold-rolled into a finished tube, known as DOM welded steel pipe . The main processes are forming, welding, sizing, cold-rolled or cold-drawn (with mandrel or without mandrel), or continuous cold drawn (ie, cold drawn welded joint production line). Features: decentralized production processes, long process and production cycle, large area, good dimensional accuracy, smooth inner and outer surfaces, mechanical properties and microstructure good state. 　　The third mode of production: the tube (plate, belt) first formed directly welded into the pipe after a certain size, ente...

　　Our daily go to the mall to buy things, Huidong stroll look on the west, carefully compare the prices and quality will decide to buy or not to buy, simple household goods can be very good to judge the quality of quality, welding neck flanges is the same, although each a butt welded flange factory to after passing through the process of inspection to the factory, but will also have substandard products, but the probability is very low. 　　Products with butt welded flange is qualified to judge, simple method, first is to see the product finish, good product is absolutely good smoothness, very beautiful, no glitches. The second is to look at the welded flange sealing surface is intact, the neck flange cracked, under normal circumstances, pure forged flange neck does not have the defects. Finally to the size, the data can be the same, the maximum error can not exceed 2mm. 　　 Check www.tjxysteel.com for more info

　　HDG: Also called hot dip galvanized and hot-dip galvanized: is an effective way of metal corrosion, mainly for various sectors of the metal structure facilities. Is immersed steel rust after about 500 ℃ melted liquid zinc, steel member attached to the surface layer of zinc, which serve the purpose of preservation. 　　Cold galvanized: is galvanized, zinc less, only 10-50g / m2, so is the use of electrolysis or other parts of the metal surface of the material attached to a metal film craft. The formation of uniform, dense, good adhesion of the metal layer process can serve to prevent corrosion, improve the wear resistance, electrical conductivity, reflectivity and enhance the aesthetics and so on. 　　HDG and GI diffrence: 　　1, Different corrosion resistance, hot-dip galvanizing cold galvanizing several times. 　　2, On the way different jobs: HDG is 450-480 degrees in the molten liquid zinc plated zinc plating is cold at room temperature by plating zinc plating or other methods. ...

　　Your answer would be oil and gas once we have a topic on what kind of fuel you use for your cooking and shower nowadays. Thanks for the job of seamless or ERW steel pipe transportation, now we can use these oil and gas easily for improvement of our life. 　　There are some different impacts of oil and natural gas for human beings. 　　First of all, direct impact would be here. It is measured as the jobs, labor income, and value added within the oil and natural gas industry. 　　In addition, we can have a view for indirect impact. It is measured except direct impact, we can get value added occurring throughout the supply chain of the oil and natural gas industry involved. 　　Of course, another impact is induced impact. Except the first two kinds of impacts, household spending of labor and proprietor’s income earned either directly or indirectly from the oil and natural gas industry’s spending should be counted in too. 　　 http://www.xysteelpipe.com/info/Different-effects-of-steel-pi...

　　The advantages of this ERW steel pipe processing technology are that there is a heat treatment process after welding to eliminate the residual stress in the weld and heat affected areas, to refine the grain, and to make the heat affected zone of the weld small, and the heating speed is fast, thus greatly improving the welding speed and welding quality, and can be used as a blank without pickling, shot peening and trimming. At the same time, it can weld alloy steel, high alloy steel and non-ferrous metal pipe, greatly reducing unit power consumption. A set of welding equipment can be used to produce each. 　　The advantages of this ERW steel tube processing technology are that there is a heat treatment process after welding to eliminate the residual stress in the weld and heat affected areas, to refine the grain, and to make the heat affected zone of the weld small, and the heating speed is fast, thus greatly improving the welding speed and welding quality, and can be used as a blank ...

　　 Transverse crack in the weld of thick-walled lsaw steel pipe 　　D36, D36-Z35 and S355 structural steel plates with thickness of 20~50mm are used respectively to produce marine experience exchanges through the JCOE forming method. The lsaw steel pipe of the 54.HAN GUAN welded pipe platform are 508~1372mm in diameter. The weld seam adopts X-shaped groove, the inner weld is three-wire submerged arc welding, and the outer welding is multi-layer multi-channel three-wire submerged arc welding. Ultrasonic testing of the weld was carried out after 24h or 48h of welding. Lateral scanning revealed that there were forest-like echoes in the middle of the weld wall thickness. Further testing found that sometimes the entire weld was intermittently with similar signals, and the depth was in the weld. centre position. In order to find out the nature of the defect, X-ray filming was performed on some of the places where the reflected signal was the highest, and no defects were found. Magnetic parti...