LSAW Steel Pipe

 Year: 2023 Country：Ecuador Quantity: 1078.12MT Product: LSAW steel pipe Project: Ecuador LSAW Heavy Crude Oil Pipeline Project Standard and Specification: API 5L X56M PSL-2 508*10.31mm LSAW steel pipe https://www.xysteelpipe.com/ecuador-lsaw-heavy-crude-oil-pipeline-project/

Project Location: Saudi Arabia Product：LSAW STEEL PIPE & ELBOW Specification：690*20*12M;740*20*12M Standard and Material：ASTM A53 GR B Usage: Dredging Project Inquiry Time：04.2022 Order Time：05.2022 Shipping Time：06.2022 In April 2022, when I contacted the customer for the first time, I received an inquiry from their Technical Department. The inquiry includes steel pipes, flange-welded steel pipes and flange-welded elbows, including detailed product drawings for the customer’s dredging project in Saudi Arabia. Because the project is under construction, the customer has strict requirements on the delivery time. Therefore, our Technical and factory studied the drawings carefully, then offered quotation with batch shipment delivery plan for customer. After providing customers with our previous shipment records of similar products, their company highly affirmed our production capability. And then we signed the contract within two weeks. https://www.xysteelpipe.com/flange-welded-steel-p...

Project location：Australia Product：LSAW Steel Pipe Standard and material：EN10219 S355JR Specifications：DN500 Usage：Marine Piling Construction Inquiry time：2021.10 Order time：2022.5 Shipping time：2022.7 Estimated arrival time：2022.8 In last Oct，Xinyue received a new enquiry of LSAW steel pipes with Epoxy painting from our regular client for a small jetty piling construction to Australia. The enquiry is very complex, one OD pipe but with several different length and in total quantity only several piles & less than 50tons, also required heavy thickness Epoxy painting. After several months of bidding, design changes and price updates, the project finally made good progress in this February. However, the production time left for us is very tight due to the early technical &commercial confirmation took too long time. In order to help customers catch up with the construction time by the end of August, Xinyue production and technical department launched a quick pre-production meeting, ...

 Project Location：Chile Products：LSAW steel pipe with welding shoes Size： 800*18*12000mm 800*18*13000 mm Standard and steel grade：ASTM A252 ASTM A572 GR. 50 Coating requirement: Bare Pipe Application：Bridge Construction Inquiry Time: April 2022 Purchase Time：May, 2022 Shipped Time：July, 2022 This order is a regular customer in Chile, and it is a pile pipe order from a construction company, and the end user is a public government project in Chile. Due to the cooperation between Xinyue and the customer in the past, Xinyue’s quality, delivery and service were excellent, and the purchase speed was very fast in this order, and it only took 1 month from the inquiry to the transaction. At the beginning of the quotation, we provided several design solutions for the customer, with the sea transportation method, to maximize the customer’s procurement solution, the lowest procurement cost and the fastest delivery time, so as to seize the procurement right from the terminal together with the c...

　　Difference between hot stretch reducing pipe and LSAW steel pipe are basically has the following two points: 　　1, Resulting in differnce on product quality due to the different processes, hot stretch reducing also carried out a process after high-frequency welding process that lsaw steel pipe can not found ------ Longitudinal are no clear line inside and outside burrs. Burr presence will affect the tube fluid - flow, burr block the normal flow of fluid, resulting in a whirlpool. According to principles of fluid mechanics, welding must increase local compression, discontinuity make pipe safety factor is also greatly reduced, hot stretch reducing steel production process - fully taken into account the existence of the risk of burrs, to limit burr removal, making it uniform thickness, no difference in the appearance and seamless. So from this point of view, hot stretch reducing pipe joints also completed the transition seamless. 　　2, Weld quality directly determines the quality of ...

　　Transverse crack after lsaw steel pipe measures rework appear, specifically: 　 　1. Confirm defect 　　All welds 100% UT inspection, crack marked location, length, depth and direction. If the entire weld has defects, the proposed dig out the entire re-submerged arc weld, partial repair is recommended SMAW. 　　2, Planing preheat 　　Preheating temperature is 110-170 ℃, preheating temperature weld both sides of the detection position is not less than 150mm, the heating is within the range of from defects around 500mm. 　　3, Gouging 　　Gouging out both ends of the range of cracks, weld integrity is not less than 50mm Outbound middle gouging, gouging ends gently to smooth the transition, the transition surface and a vertical line at least greater than 45 °. Gouging carbon rod angle should be at 60 ° or less, particularly in the crack to arrive at an angle as small as possible. 　　4, Polished 　　Polished to no black, polished surface after the transition should be smooth, there sho...

　　In addition to large-caliber LSAW steel pipe as a structural material generally has good mechanical and process performance, but also has the use of stainless steel corrosion environment, maintaining the appearance of fine excellent characteristics, but also with acid and alkali resistance, high stainless steel pipe temperature, low temperature resistance, excellent magnetic properties, wear and other functions. Stainless steel pipes and other metal materials have been widely used in construction projects also has the following characteristics compared. 　　1) Large Diameter Longitudinal has a high specific strength and specific stiffness. Specific strength and stiffness of structural engineering in the selection of materials two basic parameters. Strength is the ratio of strength and weight, high-strength steel for the 52 different types of stainless steel pipes in different state than the intensity of the heat treatment may be in the range of 46 to 152, while the aluminum alloy co...

　　Select of Straight Seam Submerged Arc Welded Steel Pipe 　　(1) For high peak load requirements of the pipeline, because the user's gas consumption is very uneven, pipeline pressure fluctuations in the frequent, alternating stress steel to withstand large tubing will expand the existing defects in alternating stress, if more choice weld defects high probability of spiral welded steel pipe, the safe operation of the pipeline will not be guaranteed. 　　(2) Pipeline crossing earthquake fault or by topical highly seismic region, due to the geological activity of these lots frequent pipeline will have a vertical or axial alternating stresses. Spiral weld much higher than the probability of defect LSAW steel pipe, under long-term stress, spiral welded steel pipe is much higher than the probability of an accident LSAW steel pipe , therefore, in such areas should be used straight submerged arc welded pipe. 　　(3) Internal and external coating requires a high piping should be used LSAW....

　　In 1940 the United States first use UOE method to produce large diameter LSAW steel pipe . In the early 1950s, the United States built a LIOE pipe workshop with a diameter of 607 to 915 mm. 1955 ~ 1967 years of Europe, the United States, Japan UOE welded pipe construction workshop, the diameter of its pipe range of 406 ~ 1067mm, the maximum length of steel pipe is 12m. From 1967 to 1976, the maximum diameter of welded steel pipe was 1626mm, the pipe wall thickness was 40mm, the length of pipe was 18m, and continuous pre-welding and automatic nondestructive testing and automatic control were used in Germany and Japan. 　　Design scale and product program UOE pipe workshop design scale is generally 40 to 110 million t/a, the main varieties of high-quality carbon steel pipe, steel pipe yield strength of 750MPa, product specifications for the diameter of 406 ~ 1626mm, wall thickness 6. 4 ~ 40mm, length up to 18m. 　　Process UOE pipe material for the thick and thick steel plate, planing ...

　　Water supply is essential for the use of steel pipes and conical steel pipes to cause “secondary pollution” in pipeline transportation. In daily life, the quality of drinking water and the safety of water pipes are the core of people's lives. Metal pipes have four major drawbacks: easy to rust, perishable, easy to leak, and prone to scaling. When the galvanized tapered steel tube is corroded, it will breed various microorganisms. Conical steel pipe. Bacteria in tap water are like tangible killers that constantly force people to be healthy. 　　In the past 10 years, some wealth-prone countries have enacted legislation or established industry regulations to stop the use of double-sided lsaw steel pipes as drinking water pipes, and it is recommended to use green pipes as the main body, without rust, corrosion and leakage. Excellent pipelines have no scale. 　　The standards for the implementation of straight seam steel pipes are those allowed by the standards and standards allowed b...

　　Advantages of LSAW steel pipe will be contained as follows: 　　1. Compared with the LSAW steel pipe, the welding line of SSAW steel pipe is poor, the stresses concentration phenomenon is serious. 　　2. The manufacturing process of SSAW steel pipe determines that the residual stress of it is greater than that of LSAW steel pipe. LSAW steel pipe uses overall expansion process, the residual stress closes to zero, and the SSAW steel pipe can not do this. 　　3. For the same diameter, the thickness of the pipe SSAW steel pipe may reach is much smaller than the LSAW steel pipe, such as the thickness of LSAW steel pipe is generally 6 ~ 25mm, the maximum thickness of it can up to 45mm, while the wall thickness of SSAW steel pipe can only reach 18mm. 　　4. The weld offset of SSAW steel pipe is mainly in range 1.1 ~ 1.2mm, the standard requires that the weld offset must be less than 10% of the wall thickness. For thin-walled SSAW steel pipe, the weld offset is difficult to meet the standar...

　　In the process of manufacturing lsaw steel pipe , lsaw steel pipe manufacturers need to have very good control of the pressing force. This is because during the welding process, when the temperature of the edge of the two tube blanks reaches the welding temperature, they should be applying a certain pressure, which allows the metal crystal grains to penetrate each other, resulting in tightly bonded crystals for the purpose of firm welding. However, if the extrusion is insufficient, the crystals are not formed well, and the strength of the welding position will be Very low, it is easy to crack due to the action of external force during use. However, when the extrusion is too large, the welding metal reaching the welding temperature will be squeezed out of the weld position, and the true welding can be the metal that reaches the temperature will be very small, so the amount of crystallization will also decrease, which will also lead to the welding is not strong enough, but also has a l...

　　The joint formed by the lsaw steel pipe when joining the two connected bodies is called a weld bead. Both sides of the weld are subjected to welding heat during welding, and changes in structure and properties occur. This area is called the heat affected zone. Due to the welding material of the workpiece material and the welding current of the straight seam steel pipe during welding, overheating, embrittlement, hardening or softening may occur in the weld and heat affected zone after welding, which also deteriorates the weldment performance and deteriorates the weldability. This requires adjustment of the welding conditions, pre-heating of the weldment interface before welding, welding heat preservation and post-weld heat treatment can improve the weld quality of the weldment. 　　Straight-slit steel pipe is a process in which two or two kinds of materials of the same kind or different materials are integrated by atomic or molecular bonding and diffusion, and the method for causing ...

　　In recent years, with the development of the national economy, thick-walled LSAW steel pipe have been increasingly used in offshore platforms, high-temperature and high-pressure vessels, and wind power pipe piles. The production of such steel pipes generally uses D36 steel, S355 steel and structural steel plates with Z-direction properties. The thickness of the plates is large, the carbon content is high, and the carbon equivalent is high. The weldability is poor, and the hardenability tends to be large. The welding performance of the joints is reduced, and cold cracks are easily generated, especially the transverse cracks are more likely to appear. After the occurrence of welding cracks, in addition to the necessary control measures, it is also necessary to pay attention to the timely repair of the workpiece. Taking S355 steel as an example to illustrate the repair measures after the occurrence of transverse cracks in welding. specifically is: 　　1, Confirming the defect 　　A 100...

　　The quality inspection method of lsaw steel pipe is as follows: 　　1, Judging from the surface, that is, in appearance inspection. The appearance inspection of welded joints is a simple and widely used inspection method. It is an important part of the inspection of finished products. It mainly finds the defects on the weld surface and the deviation in dimensions. It is usually visually inspected and tested with tools such as standard templates, gauges, and magnifiers. If the weld surface defects, there may be defects inside the weld. 　　2. Physical method inspection: The physical inspection method is a method that uses some physical phenomena to measure or test. Inspection of defects in materials or workpieces is generally performed by means of non-destructive testing. Non-destructive testing includes ultrasonic testing, ray testing, penetrant testing, and magnetic testing. 　　3, The strength of the pressure vessel inspection: pressure vessel, in addition to the sealing test, but...

　　Features of lsaw steel pipe structure in design are as follows: 　　(1) The geometrical characteristics of the pipe section are good, the pipe wall is generally thin, the cross-section material is distributed around the centroid, the radius of rotation of the cross-section is large, and it has strong torsional rigidity; as a member subjected to compression, bending and bi-directional bending, The bearing capacity is higher, and the accuracy of flatness and cross-sectional dimensions of the cold-formed pipe is better than that of the hot-rolled opening. 　　(2) In terms of anti-hydrodynamic properties, the cross-section of the circular pipe is the best, and the effect of wind and water flow is greatly reduced. Rectangular tube sections are similar in this respect to other open sections. 　　(3) The steel pipe is a closed section; in the case of the same average thickness and cross-sectional area, the exposed surface area is approximately 50% to 60% of the open section, which is benef...

　　It can destroy the ingot casting structure, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the lsaw steel pipe is no longer an isotropic body to a certain extent; bubbles, cracks and looseness formed during pouring can also be welded under high temperature and pressure. 　 　Disadvantages of lsaw steel pipe 　　1. Residual stress caused by uneven cooling. Residual stress is the stress of internal self-phase equilibrium under no external force. Hot rolled steel of various sections has such residual stress. The larger the section size of general steel, the greater the residual stress. Although the residual stress is self-balanced, it still has some influence on the performance of steel components under external forces. For example, it may have adverse effects on deformation, stability, and fatigue resis...

　　 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...

　　Surface microcracks of lsaw steel pipe impact on product quality greatly, ranging from commuted, while in retirement, especially niobium, vanadium, titanium Longitudinal most prominent, has seriously affected the improvement of product quality and finished product rate. This not only gives the enterprise has brought huge economic losses, but also restricts the development of varieties of plate production line. Longitudinal surface microcracks mainly has edge crack, longitudinal, star cracks, its causes both improper rolling process parameter control, there are abnormal production of continuous casting process, the slab cracks genetic, residual element enrichment. 　　Longitudinal surface microcracks severely affect product quality. Longitudinal surface micro cracks main reason is the continuous casting mold copper coating off. This aspect will lead to copper penetration into the solidified shell austenite grain boundaries, grain boundary cracks; on the other hand will be uneven due ...

　　Transverse crack after lsaw steel pipe measures rework appear, specifically: 　　1. Confirm defect 　　All welds 100% UT inspection, crack marked location, length, depth and direction. If the entire weld has defects, the proposed dig out the entire re-submerged arc weld, partial repair is recommended SMAW. 　 　2, Planing preheat 　　Preheating temperature is 110-170 ℃, preheating temperature weld both sides of the detection position is not less than 150mm, the heating is within the range of from defects around 500mm. 　　 3, Gouging 　　Gouging out both ends of the range of cracks, weld integrity is not less than 50mm Outbound middle gouging, gouging ends gently to smooth the transition, the transition surface and a vertical line at least greater than 45 °. Gouging carbon rod angle should be at 60 ° or less, particularly in the crack to arrive at an angle as small as possible. 　　4, Polished 　　Polished to no black, polished surface after the transition should be smooth, there sh...