LSAW Steel Pipe

　　The diameter of steel pipe can be divided into outer diameter, inner diameter and nominal diameter. 　　The outer diameter of the pipe with the antiseptic spiral steel pipe is denoted by letter D, followed by the size and wall thickness of the outer diameter. 　　For example, the anticorrosive spiral steel pipe with an outer diameter of 108 has a wall thickness of 5mm, which is expressed by D108*5. The plastic pipe is also expressed by the outer diameter, such as De63. Others such as reinforced concrete pipes, cast iron pipes, and galvanized pipes are indicated by DN. Design drawings are generally expressed in terms of nominal diameters. The nominal diameter is a standard that is conveniently and artificially specified for design, manufacture and maintenance. It is also a nominal diameter and is the specification name of a pipe (or pipe fitting). 　　The nominal diameter of the pipe is not equal to its inner diameter and outer diameter. 　　For example: a nominal diameter of 100MM sp...

　　The quality inspection process of ERW steel pipe includes on-line nondestructive testing, metallographic examination, flattening, combustion destructive test and hydrostatic test. Evaluation process: 　　1, online nondestructive testing 　　The detection arm of the testing station rotates and is placed on the longitudinal welded pipe production line. Observe the position of the weld through a camera. The position of the probe is adjusted by the lever so that the weld overlaps with the laser and saves the parameters. Input the coil number through DATASERVR and DACQ computer. The waveform of the observation defect detection interface is displayed. When the waveform exceeds the alarm line, the thickness measurement information is compared to determine whether it is a defective or interfering wave signal, and the naked eye is checked to see if the waveform is beyond the alarm line. If the alarm line exceeds the alarm line, the alarm will be issued. Close and adjust the welding parameters...

　　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...

　　Lamination defect control measures of spiral steel pipe is following below: 　　 1, to improve the toughness of plastic tube 　　Improve the cleanliness of molten steel, to reduce the harmful inclusions; increase the proportion of the slab crystal axis, to reduce the center segregation and center porosity; the use of reasonable cooling system to avoid cracks occur within the slab; billet or rolling slab to be taken offline slow cooling process, reduce internal stress, thus ensuring the microstructure and mechanical properties of the finished tube and pipe meet the technical standards. 　　 2, the reasonable control of the heating temperature 　　By measuring the thermoplastic curve, choose the best heating temperature. Note also that there is enough heating tube holding time, in order to reduce and improve plastic deformation resistance and toughness. 　　 3, lower roll speed 　　Roll speed is a key parameter piercing process, the roll speed from low to high variations in the process...

　　Generally speaking, the welded steel pipes are divided into general welded pipe, galvanized welded pipe, oxygen welding tube, metric system welded tube, transformer tube, welding thin wall pipe and spiral welded pipe etc. 　　General welded pipe: General welded pipe adopts Q195A, Q215A and Q235A or mild steel as raw materials. It is used to transfer the low pressure fluid. In addition, the pipes need water pressure, bending and flattening test etc. Usually, it has some certain requirements on the surface quality. The length of delivery is often from 4 to 10mm. The specifications of welded pipe in nominal diameter are different from actual size. Depending on the wall thickness, welded pipe are also divided into common steel pipe and thicken steel pipe. 　　Galvanized welded pipe: In order to enhance the corrosion resistance, the general welded pipe is galvanized zinc as protective layer. Galvanized steel pipe has two types: hot dip galvanized pipe with thicken zinc layer and electrica...

　　The influence of ssaw steel pipe production process factors on the quality of single-side welding double-sided forming welds mainly includes welding current, welding speed, number of welding layers, electrode type and electrode diameter. 　　1. Welding current. The proper choice of the welding current size directly affects the final welding quality. Excessive welding current can increase the productivity and increase the penetration depth, but it is prone to defects such as biting and welding, and increases the tendency of stomata. In particular, when the vertical welding operation is difficult to control the molten pool, the occurrence of welding defects, arc length increases, the welding current is too small, the penetration depth is reduced, prone to defects such as incomplete penetration, poor fusion, slag inclusion, and disconnection. During the training, for those students who have just come into contact with welding, this is a difficult problem to grasp. During the single-side...

　　As we all know, a company wants to survive in this competitive world, it needs to has its special characters. As steel pipe’s supplier, we would like to say that we have special production process for each kind of steel pipe from seamless steel pipe to SSAW steel pipe as well as ERW steel pipe. 　　Step 1- We will introduce steel pipe’s market overview, market threats, and market prospects, driving factors. And we would customize relative products according to client’s demand. 　　Step 2- Doing deep research on each kind of steel pipe’s character according to customer’s price structure, raw material cost, we would make production plan for our customers. 　　Step 3- Representing the procedure of the competitive steel pipe market among the manufacturer, with contracts, and income factor. 　　We would start our production when we finish all plans as we need to give our customers a successful answer sheet. 　　 http://www.xysteelpipe.com/info/Special-production-process-of-steel-pipe-1140...

　　One type of oil or gas casing is composed of a steel pipe(like seamless steel pipe) for conveying medium. With anti-corrosion jacket, and an ultra-fine glass wool filled between the steel pipe and the jacket steel pipe, it would give guarantee for safety during the whole process of transportation. 　　How to guarantee the quality of steel pipe during oil or gas transportation? 　　1. The technology of burying steel casing is a new technology for waterproofing, leak-proof, impervious, and fully-enclosed. It is a major breakthrough in the application of direct burial and laying technology in high groundwater table areas. 　　2. In addition to good mechanical strength, the oil casing is welded and connected due to its high strength. Its waterproof performance is very reliable. In addition, its high temperature resistance is also unmatched by other external protection pipes. In order to ensure that the groundwater does not affect the normal operation of the steam buried pipeline, the out...

　　In the screw steel tube feeding unit, the rolled strip steel is gradually rolled up to form an open circular pipe gap, the extrusion roll is reduced and adjusted, the weld gap is controlled at 1-3mm, and the weld end face is flush. 　　1. If the gap is too large, resulting in reducing the proximity effect, eddy current lack of heat, weld crystal combined indirect adverse arising from lack of fusion or cracking. 　　2. The gap is too small, causing the proximity effect increases, excessive soldering heat, cause weld Burning; weld or extruded, rolled after the formation of the pit, affecting the quality of the weld surface. 　　After the two edges of the tube is heated to welding temperature in the extrusion of squeeze rollers, spiral pipe to form a common metal grain mutual penetration, crystallization, eventually forming a strong weld. If the spiral pipe extrusion pressure is too small, the number of co-crystal formation is small, the weld metal strength is reduced by the force will...

　　Fusion bonded epoxy (FBE) coated pipes are used for prevent steel pipes from corrosion and harmful chemicals. These are thin coatings of epoxy-resin powder materials formed in a film and applied on pipes by specialised coating facilities by electrostatic spraying. These FBE coated pipes can be used in temperatures up to 85oC in dry conditions. 　　FBE Coating has been used as a standard in industries for protection against corrosion. FBE coatings have good handling characteristics; they are flexible and resistant to soil pressure. These are used in pipeline projects that have normal requirements and do not have harsh conditions. 　　A dual-layer of fusion bonded epoxy can also be used for coating of pipelines for use in harsher conditions to make it more abrasion resistant. The second layer is also made of the similar fusion bonded epoxy with both the layers being sprayed successively. Depending on the application, the dual-layer FBE can also come with an Abrasion-Resistant Overcoat ...

　　SSAW steel pipe is a strip coil as raw material, after extrusion at room temperature, with automatic double wire-sided submerged arc welding process welded spiral seam steel pipe. 　　 SSAW steel pipe process performance are as follows: 　　1. Bending performance. Prescribed by apex diameter bend 180 degrees, reinforced by the curved parts of the surface can not crack. 　　2. Reverse bending performance. According to the requirements, it can be reinforced reverse bending performance test. Reverse bending test bending test apex diameter than the corresponding increase in a bar diameter. First bend forward 45 degrees, after the reverse bend 23 degrees, 23 degrees after the reverse bending. After the reverse bending test, reinforced by the curved parts of the surface can not crack. 　　3. The surface quality. Steel surface allowed to have cracks, scarring and folding. Reinforced surface allows the bump, but shall not exceed the height of the transverse ribs, on the other steel surface ...

　　 SSAW steel pipe also has its own shortcomings, spiral steel hollow section is used as a large number of pipeline fluids, such as transportation of oil, natural gas, gas, water and some solid materials, pipes and so on. Compared to other steel and solid steel bar, the same torsional strength in bending, lighter, is an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive drive shafts, bicycle rack and construction using steel scaffolding. 　　Steel pipe manufacturing annular parts, can improve material utilization, simplify the manufacturing process, saving material and machining time, such as bearing rings, jack sets, has been widely used to make steel. Steel or a variety of conventional weapons indispensable material, barrel, barrel would have to make steel. Pipe according to different cross-sectional shapes can be divided into tube and shaped tubes. Because in the perimeter of equal conditions, the la...

　　No matter which kind of steel pipe we engineering project takes, stainless steel pipe, seamless steel pipe, welded steel pipe or others, it is an important lesson for us to have precautions for steel pipe users need to pay attention to. 　　There are some examples for clients: 　　First of all, to make ensure the safe operation of oil or gas, or prevent accidents from expanding in the event of an accident,we need to take some special safety measures except the basic installing detect and control. For example, there should be an accident relief valve or an emergency stop valve for the seamless steel pipes which used for long distance oil or gas transmission. 　　What's more, due to the parameter of the steel pipes, we should take original material into account when we consider the problem of the adhesion of the anti-corrosion layer. 　　 http://www.xysteelpipe.com/info/Precautions-steel-pipe-users-need-to-pay-attention-to-1118-1.htm

　 　First, anti-corrosion of seamless steel pipe 　　Seamless steel pipe corrosion according to the requirements of the drawings, the use of epoxy coal tar lacquer outsourcing glass fiber cloth, painted topcoat anti-corrosion. 　　The construction process of the outer wall: pipeline rust removal → coating primer → first time paint → second time paint → glass fiber cloth → topcoat; 　　The inner wall construction process flow: pipeline rust removal → priming → first pass paint → second pass paint → third pass paint 　 　Corrosion requirements: 　　1, Pipeline rust removal the surface of the pipe should be cleaned of grease, ash, rust, and oxide scale before being primed. The use of sand blasting rust quality standards Sa2.5. 　　2. The surface of the pipe shall be rusted and then primed. The time interval shall not exceed 8 hours. When the primer is applied, the base surface shall be dry. The primer brushing is uniform and full, and there should be no clotting or foaming phenomenon. No b...