Seamless Steel Pipe

    Welded steel pipe slag is residual slag inside the weld. From the theoretical analysis, submerged arc welding seam slag generated mainly due to the following three reasons: ① raw materials (including base metal, wire, flux) in the inclusion of more; ② multi-layer welding clean up when the inter-layer; ③ improper selection of welding process parameters is not conducive to the emergence of slag.     According to the production characteristics of straight seam submerged arc welded steel pipe, it can be ruled out that the interlayer cleaning is not clean when the multi-layer welding is done and the slag is generated.     For the inclusions in raw materials and make the weld slag, straight seam steel pipe company to take the pre-test test base metal, replacement of new welding wire and flux and other measures, weld fusion line slag generated only a slight reduction in the proportion, Indicating that inclusions in the raw materials are not the main causes...

    The microstructure of weld seam of high frequency straight seam welded steel pipe reflects the welding process performance and weld quality of the steel pipe.     High-frequency straight seam welding production is mainly the use of high-frequency current with the skin effect and the proximity effect of the two characteristics, the current is highly concentrated in the tube side welding surface, the tube side quickly heated to the welding temperature, Extrusion welding to complete. During the welding process, the metal undergoes a crystallization transition (solidification transition) from the liquid phase to the solid phase, and then undergoes a recrystallization transition (solid phase transition) after cooling to a lower temperature, Carbon steel, mainly formed by fusion of melting material into crystalline structure of the fusion zone, and from the fusion line to the organization does not occur between the base metal heat affected zone. The transformation of...

    ASTM A520 standard specification for supplementary requirements for seamless and electric resistance welded carbon steel tubular products for high temperature service conforming to iso recommendations for boiler construction.     If rimmed steel or other than killed steel is used in themanufacture of electric-resistance-welded tubes to therequirements of Speci?cation A520, the strip shall berolled in single width and shall not be slit longitudinally exceptto trim the edges.     The yield strength values at the indicated elevatedtemperatures shall not be less than those given. The yield strength corresponding to a permanent offset of 0.2 % of the gage length of the specimen or to a total extension of 0.5 %of the gage length under load shall be determined.     For lots of 400 tubes or under, one tube for each 50tubes or 2 % of the total number of tubes, at the option of themanufacturer, shall be submitted to a tensile test, a ?atteningtest...

    Water pipeline AWWA C200 steel water pipe is widely used in the following fields/industries:     Hydraulic power station, potable     Water supply industry, irrigation penstock, Sewage disposal pipe line     AWWA C200 standards covers butt-welded, straight-seam or spiral-seam steel pipe, 6 in. (150 mm) and larger, for transmission and distribution of water, including fabrication of pipe, requirements of welding operations, permissible variations of weight and dimensions, preparation of ends, fabrication of specials, inspection, and test procedures.     Inspection     All work performed and material furnished under this standard may be inspected by the purchaser, but such inspection shall not relieve the manufacturer of responsibility to furnish material and perform work in accordance with this standard.     Quality assurance     The manufacturer shall maintain a quality-assurance program ...

    Definition:     Carbon steel: mainly refers to the mechanical properties depend on the carbon content of steel, and generally do not add a lot of alloying elements of steel, sometimes called plain carbon steel or carbon steel. Carbon steel, also known as carbon steel, carbon content WC less than 2% iron carbon alloy. Carbon steel in addition generally contains a small amount of silicon, manganese, sulfur, phosphorus can be divided according to the use of carbon steel carbon structural steel, carbon tool steel and free-cutting structural steel three carbon structural steel is divided into structural steel and machine structural steel, which can be divided into low carbon steel (WC ≤ 0.25%), medium carbon steel (WC 0.25% - 0.6% ) and high carbon steels (WC> 0.6%). According to phosphorus and sulfur content, carbon steels can be divided into ordinary carbon steels (phosphorus and sulfur are higher), high quality carbon steels (phosphorus and sulfur are lower) ...

    Straight seam steel pipe fracture, hydraulic (pneumatic) parts in the design of the use of mechanical properties, brittle fracture is also related to the use of components temperature.     It has been found that when the temperature is below a certain temperature, it is found that the information will be transformed into a brittle state, and its impact absorption is significantly reduced. This phenomenon is called low stress brittle fracture in cold brittle and high strength metallic materials. In the process, the data organization is far from uniform, isotropic, there will be cracks, there will be inclusions, pores and other defects, these defects can be seen as micro-cracks in the material. Therefore, the design should also be based on the work of the component temperature to select the appropriate cold brittle transition temperature of the information.     In general, it is assumed that the information is uniform and continuous isotropic, accordi...

    Pre-welding quality of straight seam steel pipe includes seam quality and weld quality.     (1) Joint (that is, forming seam) no wrong side or wrong side is less than the specified value, the general provisions of the wrong amount ≤ 8% thickness, the maximum does not exceed 1.5mm.     (2) To ensure that the weld has a suitable penetration depth and welding volume, it is necessary to ensure that after welding does not crack, does not produce burning phenomenon, but also to control the weld height, the weld weld height does not have an impact.     (3) The weld is continuous, good shape, in order to help ensure the final external welding quality.     (4) Weld does not exist welding bias, pores, cracks, slag, burning and back welding and other defects, requiring weld center deviation ≤ 1 mm.     (5) No arc burns, splash small, does not affect the tube end groove and surface quality.     (6) Weld and base m...

    Submerged arc welding straight seam steel pipe welding introduction:     1, The bubble occurred in the middle of the weld, the main reason is that hydrogen is still in the form of bubbles hidden in the weld metal inside, so the elimination of this defect is the first step must be removed welding wire and weld rust, oil, moisture and Moisture and other substances, followed by the need to dry the flux to remove moisture. In addition, to increase the current, reduce the welding speed, slow down the melting rate of molten metal is also very effective.     2, Sulfur crack (sulfur caused by the crack). A crack in the sulfur segregation zone in the weld segregated zone, especially in soft boiled steel. The reason for this is that there is hydrogen present in the sulfur segregation zone containing low melting point iron and steel. Therefore, in order to prevent this situation, the use of sulfur segregation with less semi-killed steel or sedative steel is al...

    Black erw steel pipe is hot-rolled coil through the molding machine, the use of high-frequency current skin effect and proximity effects, so that the edge of the tube heating and melting, in the role of squeeze roller pressure welding to achieve production.     Black erw steel pipe , compared with ordinary welding technology is not the same, the weld is made of the base material of the steel body melting, mechanical strength better than the general pipe. Smooth appearance, high precision, low cost welding seam height, favorable 3PE anti-corrosion coating. High-frequency welded steel pipe and submerged arc welded pipe welding methods are significantly different. As the welding is completed at high speed instantly, to ensure the quality of welding is much more difficult than submerged arc welding.

    Taking notice for the old water pipes, specifically galvanized steel pipe when you rent an old house. No doubt that steel pips have an important role in transportation whether for water, oil or gas.     It gets me angry when I removed to my new rent house at first day. It was leaking water from the ground in kitchen when I open the water faucet just want to wash my hands. Thus I know due to the long time’s no replacement or examination, the pipes have troubles. These steel pipes build up with sediment on the inside, making the inside diameter of the pipe smaller and smaller over time, eventually to the point where water flow is unusable. These pipes also corrode at the joints, which can lead to leaks. Even they have the protection of the zinc galvanized, it cannot be good with the long time service.     So checking and replacement would be a necessary job for us when we use the galvanized steel pipe for a long time in a house.     http:/...

    We can see there are so much of waters coming from bridge when we walk under the bridge at rain day. Actually, every viaduct bridge needs the drain system made by various steel pipes like the ERW steel pipe.     Drainage from bridge must be led to the city sewer, and we can not let its natural splash together which would cause trouble for citizens as water’s everywhere. However, which kind of pipes would be a best option for its drain?     Anti-corrosion would be one of a most important factor we need to consider. Plastic would not so good for acid and alkali so we may give up it this time. And galvanized steel pipes would be one of good options among these pipes. Of course, it can also handle the problem of heat makes something expand and cold makes it contract.     Generally speaking, with the wide use of various steel pipes, they are now the pets for human being’s engineering project.     http://www.xysteelpipe.com/info/Dr...

    Lots of cities in the whole world are now using the steel pipes, wedge gate valves for various engineering project. Why? Due to the pursuit of speed, thus the steel pipe, like the spiral welded pipe would be in large demand for customers.     Finally, with the help of steel pipe, all pipes can quickly be installed by one person and uses only one single stainless steel bolt, saving time, labor and money. No doubt that all of the cities need the steel pipe for water, oil and gas transportation purpose and engineers have found the steel pipes' ease of installation which makes them stand out from other pipe products. For example, the demand is "we have to get the water and oil on as soon as possible safely". Thus, the steel pipes would be the first option for its high quality, guarantee of no leak during the transportation. Because of the corrosion resistance, they are now widely applied in water engineering, petrochemical industry, chemical industry, power industr...

    In the ultrasonic inspection of dsaw pipe, how to identify and determine the echo is a key issue. The influence of ultrasonic defect signal or non-defect signal and the radius of curvature of the steel pipe on the defect location is analyzed by analyzing the characteristics of the actual ultrasonic testing of the double-sided submerged arc welded pipe weld, including the segregation, inclusions, crack and base metal delamination of the ultrasonic echo signal. This paper summarizes the causes and identification methods of four kinds of pseudo-defective waves, such as the reflected wave of the coupling agent, the reflection wave of the weld surface, the reflected wave caused by the upper and lower dislocation of the weld, and the non-defect wave formed by the weld height or the undercut The accuracy of the defective wave discriminating provides a new idea and direction for the actual ultrasonic testing of the dsaw pipe.     In the ultrasonic inspection of steel p...

    There are many ways to connect carbon steel seamless tube, and now several commonly used methods are listed:     a, compression type; b, live connection; c, compression; d, push; e, taper thread; f, socket welding; g, live flange connection; h, welding and welding and the traditional combination of the derivative Series of connections.     Different connections, because of their different production principles, its application areas are also different, but in general have one thing in common is the easy installation, solid and reliable.     Here are some of the more common connection to do a brief introduction:     1. Compression: the pipe into the pipe fittings, fastened by the nut, with a spiral force to the mouth of the casing through the seal ring compression, sealing effect, to complete the connection pipe.     2. Welding type: the end of the pipe processing bevel, with manual or automatic welding on the pipe...

    A106B seamless steel pipe thread inspection is more complex and divided into the screw thread test and pipe thread test.     1. Collar thread inspection     After the processing of the wire, the internal taper, the inner pitch, the thread height and the concentricity are tested, and the tightness and the comprehensive parameters are checked by the thread plug and the incomplete head. In addition, the thread surface according to API standards for artificial eye inspection.     2. Pipe thread inspection     Tube thread, the external taper, the outer pitch, the thread height of the test, with a thread profile microscope on the thread angle sampling, with the thread ring and smooth ring gauge on the tight distance and comprehensive parameters of the test, in addition to the The thread surface is checked according to the API standard. After the machine is screwed with a plug and not a single-head plug gauge on the screw after th...

    Steel pipe in the production, the single length is usually less than 14m, and some of the length of service in the steel pipe is often much more than this length. For example, in geological drilling and oil drilling, drilling depth is usually above 1000m, up to 7000m; for conveying oil, natural gas, water, alkali, minerals and other transport lines up to several kilometers or even hundreds of kilometers. To this end, the need for both ends of the steel pipe thread, the use of the corresponding coupling (take over) to connect the steel pipe. Threaded connection requires high connection strength, good air tightness, to prevent the fracture of steel and transport media leakage. In order to meet the needs of a variety of uses, the world has developed a variety of forms of thread, but the main use of the following three:     (1) Dome triangular thread. It is characterized by simple thread processing. But the thread is uneven and deformation, so the connection stren...

    Electric-resistance welded pipe(short for erw pipe ) can only occur in a specific environment, it also has the following characteristics:     (1) Stress corrosion cracking can only occur when stress (especially tensile stress) is present. This stress can be an applied stress, or the residual stress introduced during the welding and joining process, or the expansion stress caused by the wedging action of the corrosion product.     (2) Stress corrosion fracture is a time-dependent hysteresis damage, which is completely similar to hydrogen lag cracking.     (3) Stress corrosion cracking is a low stress brittle fracture.     Stress corrosion cracking is a common cause of failure of the chemical and chemical equipment, especially the erw pipe for oil pipelines. Due to the unpredictability of stress corrosion cracking, it is the biggest hidden danger in the petrochemical industry. The necessary conditions for stress corrosion crac...

    SA 213 standard specification for seamless ferritic and austenitic alloy-steel boiler,super heater,and heat-exchanger tubes.     1. Surface state:     Austenitic steel pipe should be washed to remove the scale, when the use of bright annealing, you do not need pickling.     2. Chemical analysis of finished products:     It shall be analyzed from one billet or one pipe per furnace, and the chemical composition determined accordingly shall meet the specified requirements.     3. Mechanical test and grain size:     (1) Tensile test:Such as each batch of steel pipe ≤ 50 root, then take a sample for tensile test; each batch of steel pipe> 50, then two steel pipes should take two samples for tensile test.     (2) Flattening test: in each batch of a finished tube at both ends of each sample to take a flattening test, but the root can not used as a flaring sample.     (3) Flaring te...

    Seamless steel pipe can be divided into two types, one is seamless round tube, one is seamless square tube, seamless round tube is the most important use of the pipeline and machinery industry, such as oil pipelines and natural gas pipeline, also there are natural gas pipeline and so on; there is the machinery industry, the car is made of semi-axle is made of seamless steel, as well as bicycle steel frame, but also as a material for the production of the boiler. The seamless tube is mainly used for the construction industry.     Seamless steel pipe in the pipeline before the need to rust paint, and seamless square tube is made of first, galvanized, galvanized way is mainly divided into galvanized and hot galvanized in two ways, we usually see galvanized seamless square pipes are generally hot-dip galvanized because hot-dip galvanized seamless tubes are much stronger than galvanized seamless steel tubes because the main purpose of seamless square pipes is for c...

    The most common way to test the hardness of a SA 213 boiler tube is to use a rasp to wipe the edge of the workpiece and to scrape the depth of the surface to determine its hardness,whose method is not scientific. Hardness tester to test is extremely accurate, is a modern test hardness commonly used method. The most commonly used test method is rockwell hardness test. Rockwell hardness testing machine use diamond into the metal depth to determine the hardness of boiler tube, into the depth of the larger, the smaller the hardness. Diamond into the metal depth, can be pointed out from the pointer the correct number, the number is called rockwell hardness.     Forging     It is a hammer to make the metal into a certain shape <forming> method, when the SA 213 boiler tube heating to the forging temperature, you can engage in forging, bending, drawing, forming and other operations. Most high-pressure boiler tubes are heated to fresh cherry red when t...

    Words have magic power or you can say they are mysterious for us. For example, do you know the meaning of pipe in English? Sara can say that it is a stuff for my grandfather’s smoking; Sara can also say that it is a little thing for music using. Of course, Sara can even say that it is used in building construction! How? With the combination of spiral welded pipe, it would be applied in building project.     With the common meaning, all of us would think building construction when we talk the word “pipe”. however, in the same pipe, there are categories of seamless steel pipe, ERW steel pipe, LSAW steel pipe and SSAW steel pipe...which one would you like to choose? We, as professional manufacturer, would tell you when your answer is no!     Maybe you don’t know that you need pipe fitting as piling pipe is widely used in coastal, river, lake area. Offshore, deep water terminal project in the country have also been large-scale construction in coastal ar...

    LSAW welding machine is a kind of automatic welding equipment that can be automatized by automatic and mechanized linear weld of welding workpiece. LSAW welding machine is also called straight seam automatic welding machine, longitudinal seam automatic welding machine, which is a kind of automatic welding machine. It can replace a lot of manpower, greatly improve the production efficiency and welding quality, reduce labor costs, improve the welding workers working environment. Such as the large-scale transformers shell angle seam welding, straight seam welding large-scale cylinder, solar water heater cylinder straight seam welding, production line with straight seam welded steel, H-beam welding, etc., are extensive use of straight seam welding machine.     Specific classification of lsaw welding machine is as follows:     CZ series welding operation machine     Welding operation machine is a mechanical and electrical integration welding ...

    There are lots of steel products, which are integrally hot galvanized, and they would never rusty with long life. Thus, this is the popularity of the galvanized steel pipe, aluminum sheet, strip, hot galvanized plate, such as powder coatings.     Thick galvanized and low cost galvanized would be symbol for hte hot dipped galvanized steel pipe. Of course, the surface of the steel pipe's product would not very smooth. This kind of steel pipe is to produce molten metal and iron matrix reaction and produce alloy layer. Under this situation, there is the combination of the substrate and coating. The advantage of this production process are uniform coating, strong adhesion, long service life and so on. Thus, galvanized steel pipe can be used in low pressure liquid delivery such as water, gas and oil with the wall thickness 0.8-22mm.     Of course, there are different types for the galvanized steel pipes:     1. Pre-painted (zinc: 60-120G/M2) ...

    High-frequency welded pipe typical process: uncoiling - straightening of steel strip - head and tail shear - strip welding - sleeve storage - forming - welding - clear glitch - sizing - flaw detection - flying cut - initial inspection - pipe seal processing - water pressure test - flaw detection - printing and coating - finished products.     Welding speed is one of the main parameters of the welding process, which is related to the heating system, the deformation rate of the weld and the speed of mutual crystallization.     In the high-frequency welded pipe, the welding quality with the welding speed to accelerate and improve. This is because the heating time is shortened to narrow the width of the edge heating zone and shorten the time for forming the metal oxide. If the welding speed is reduced, not only the heating zone is widened, but also the width of the melting zone changes with the change of the input heat Burr is larger. In the low-speed w...

    1. Pipe gap control     Adjust the extrusion volume of the squeeze roller, so that both ends of the weld to keep flush, opening angle of 7 degrees below the weld gap control in 1-3 mm. Weld control is too large, there may be poor welding, welds are not fused or cracked, weld control is too small, due to heat is too large, likely to cause weld burns, melting metal splash, tumor is too large, affecting welding quality The (Metal spatter reasons: squeeze the melting tube edge, the weld inside the steam pressure is greater than the surface pressure)     2. High-frequency induction coil position control     The position of the induction coil should be on the same center line as the steel pipe, and the distance between the front end of the induction ring and the center line of the pressing roller should be as close as possible to the steel pipe,will reduce the strength of the weld. The coupling of the induction coil is as thin as possible. Wh...

    Production process of medium thickness thin walled straight seam high frequency welded pipe:     1. Board test: used to make large diameter submerged arc welded steel pipe straight into the production line, the first full-board ultrasonic test;     2. Milling: through the milling machine on both sides of the steel plate for double-sided milling, so that the required plate width, board parallelism and groove shape;     3. Pre-bending: the use of pre-bending machine for the edge of the pre-bending, so that the board has to meet the requirements of the curvature;     4. Forming: In the JCO forming machine, the first half of the pre-curved steel plate after a number of step into the stamping, pressed into a "J" shape, and then the other half of the same bending steel, pressed into a "C" shape, and finally formed openings Of the "O" shape     5. Pre-welding: the forming of the straight seam welded steel pipe joints and...

    Weld pipe manufacturers in the production of high-frequency welded pipe process, will encounter the surface of the pipe was scratched the situation, the reason for this is due to the main reason for the guide roller and squeeze roller caused.     1. The scratches caused by the guide roller generally occur on both sides of the high-frequency welded pipe, the characteristics of the scratch is relatively large, strong continuity. Reasons include:     (1) The height of the guide sleeve is not correct, such as guide roller bearing damage, guide roller can not be a good control of high-frequency welded pipe , so that with the guide sleeve friction caused by scratches.     (2) When the guide roller deviation from the high-frequency pipe production line rolling centerline is too large, the guide sleeve and guide roller axis relative difference is too large, resulting in high-frequency welded pipe on both sides of the scratch.     2. ...

    Steel pipe pile is suitable for the construction of the terminal in the terminal, the diameter range is generally between 400-2000mm, the most commonly used in 1800mm.     Shaped steel pipe can better adapt to the special conditions of use, save metal and improve the productivity of spare parts manufacturing. Its widely used in aviation, automobile, shipbuilding, mining machinery, agricultural machinery, construction, textile and boiler manufacturing and so on. Production of special-shaped pipe methods are cold drawn, welding, extrusion, hot rolling, which cold drawn method has been more widely used. Utility model in the cofferdam when the steel pipe pile between the use of each other was curved or round shape. It can play the role of water, earth, sand and so on. The utility model has the advantages of novel design, simple structure, convenient use, easy overlap and good sealing. Including cross-sectional profile non-circular, and other wall thickness, variabl...

    Electric resistance welding technology for direct rolling of steel is a rapid production pipeline technology, which is widely used in many fields such as downhole casing, oil and gas gathering and transportation, etc. However, the weld of this pipe has a higher activity than the base metal and the heat affected zone, so the weld zone determines the service life of the welded pipe.Trench corrosion is a special crevice corrosion phenomenon for the seam welded pipe, which usually forms a groove in the weld zone The Under natural conditions, the formation of the groove is easy to make the corrosive medium in the stagnant state, resulting in the reduction of dissolved oxygen concentration, and gradually formed in the seam and seam oxygen concentration of the battery to accelerate the corrosion of metal within the seam. At the same time, the residual metal ions in the process of corrosion, it was observed in the neutral sodium chloride solution in the gap, the chloride contained...