The effect of antirust oil on thick wall coiled pipe is antirust effect, which can make the thick wall coiled pipe as smooth as new for a long time and reduce the external corrosion to it. It can also increase its sealing performance and ensure that there will be no problems when transporting fluid. In addition, it has moisture-proof performance, uses antirust oil to isolate the direct air of thick wall welded pipe so it has little chance of being changed by the external situation, which increases its stable performance and safer use.
In short, hot rolled steel pipe is a special thick wall steel pipe rolled with steel plate under heating conditions. Here, hot coiling refers to heating to coil the steel plate. Its meaning shall be determined with cold rolled steel pipe.
.Meet the requirements of American Petroleum Institute standards.
Thick wall coiled pipe is made of steel plate. Thick wall coiled pipe can be divided into coiled pipe and hot rolled thick wall coiled pipe.
.Recently, with the rapid development of excellent strip continuous rolling production and the progress of welding and inspection technology, the weld quality has been continuously improved, and the technology of welded pipe has also been continuously improved, so as to gradually replace the seamless steel pipe. The main one is the technological development of welded pipe. Our welded pipe is made of steel plate or strip steel and welded after crimping. It is generally a welding process, which improves the production efficiency and service quality of welded pipe.
Today's equipment is double-sided submerged arc welding, because it goes without saying that double-sided welding is necessary here.
All continuous pipe welds shall be penetration tested.
In short, hot rolled steel pipe is a special thick wall steel pipe rolled with steel plate under heating conditions. Here, hot coiling refers to heating to coil the steel plate. Its meaning shall be determined with cold rolled steel pipe.
For pipe fittings with nominal pressure indicating their grade or specified pressure and temperature rating, the pressure and temperature rating specified in the standard shall be used as the reference. For example, for pipe fittings with nominal thickness of straight pipe connected to them, the applicable pressure and temperature rating shall be determined according to the reference pipe grade specified in the standard, For example, for pipe fittings with only overall dimensions specified in gb14383 ~ GB standards, such as GB1245 and GB 1340, confirmatory test shall be conducted to determine their bearing strength.
If the particle size of straight seam coiled pipe is too small, the adhesion and impact strength of the coating will be reduced. For serious internal pitting corrosion, it can not only rely on the high-strength impact of large particles of rinse agent but also remove corrosion products with small particles. Reasonable ratio design can not only slow down the speed of pipeline and nozzle (propeller) rinse agent. Wear and tear, and the rate of rinsing agent can be greatly improved. Generally, the particle size of metal particles is 2 - 9mm, and the particle size of metal sand is 1 - 2mm, of which 3 - 5mm is a common component. The sand shot ratio is usually 4 to 9.
Process inspection.Welding voltage because the welding arc is conical, and the welding voltage directly affects the length of the arc. Therefore, the general production process of thick wall continuous pipe can be divided into cold drawing and hot rolling. The production process of cold rolled seamless steel pipe is generally more complex than that of hot rolled steel pipe. First, the round pipe will be cut and the growth of the blank is about M. However, during annealing, acid should be used for annealing, and attention should be paid to whether there are a large number of bubbles on the surface. If a large number of bubbles appear, and the wall thickness is generally smaller than that of hot-rolled seamless steel pipe, but the surface is brighter than that of thick wall seamless steel pipe, the surface is not too rough, the diameter is not too prickly, and the strength is high. The manufacturer offers, operates in good faith, and has a real price. The same specification, thick wall continuous pipe, spot supply,. With the increase of welding voltage, the arc length increases, the moving range of solder joint increases and the molten pool widens. If welding is carried out in a horizontal position, the weld width will be changed, but the edge transition of the weld will not be affected. However, the external welding of spiral welded pipe is carried out on the slope and the molten weld metal will flow laterally under the action of gravity. We specialize in providing hot-rolled steel pipe, large-diameter thick wall continuous pipe, thick wall straight seam continuous pipe, steel casing and quality assurance of pipe rolling plant. During the preferential activities, new and old customers are welcome to consult. Therefore, the greater the welding voltage, the wider the weld pool, the more serious the transverse flow of weld metal, and finally lead to the bias of weld metal.
In fact, the surface pit of the coiled pipe is almost caused by the sparse iron oxide scale on the surface of the steel plate. In general, we can apply the following methods for prevention.
Be able to show important value in different industries and fields. When the coiled pipe is greater than 600mm, and the spacing shall be greater than 200mm.
The steel plate rolling pipe we call the steel plate rolling pipe is actually a process. The following small series will describe the process sequence: plate inspection, blanking, beveling, steel plate rolling, assembly spot welding, campus, perimeter and roundness deviation inspection, welding, weld inspection, pipe test and delivery. Professional hot-rolled steel pipe, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory and other special products, old brands, price advantages and guaranteed quality. These processes can not be less.
quality standard.steel products.
031 inspected 8517611 standard, and then made by high-frequency welding and submerged arc welding. According to the weld form, it is divided into straight welded pipe and spiral welded pipe. According to the purpose it is divided into general welded pipe, galvanized welded pipe, oxygen blowing welded pipe, wire sleeve, metric welded pipe, idler pipe, deep well pump pipe, automobile pipe, transformer pipe, electric welded thin-walled pipe, electric welded special-shaped pipe and spiral welded pipe, coil, Q235B coil, Q345B coil, large-diameter thin-walled coil, large-diameter thick-walled coil, stainless steel coil, L360 coil and 16Mn coil Quality. Preferential activities are in progress. Welcome to consult. Large diameter welded pipe, etc. According to the purpose, it is divided into seamless steel pipe for structure; Seamless steel pipe for transportation; Seamless steel pipe for boiler; High pressure seamless steel pipe for boiler; Seamless steel pipe for geological brick exploration; Seamless steel pipe for petroleum brick exploration; Seamless steel pipe for petroleum cracking; Seamless steel pipe for ships; Cold drawn cold rolled precision seamless steel pipe; Various seamless steel pipes expressed as outer diameter, wall thickness and thick wall are mainly used for machining, coal mine, hydraulic steel, etc.
However, the disadvantages of manual cutting and cutting are also obvious and the quality of the incision is very poor Big size error There is a great waste of materials The post-treatment process has large processing capacity and poor working conditions. Cutting with a forming machine can greatly improve the quality of the workpiece, but the workpiece must be pre machined. It is not suitable for blanking of single chip, small batch and large workpiece. Although the semi-automatic cutting machine reduces the labor intensity, its function is simple and is only suitable for cutting two shapes. Due to the low cost of equipment, the above cutting is easy to operate compared with CNC cutting Easy to operate, so even in some large enterprises, it is still widely used in small and medium-sized enterprises.
.Hot melt installation: pipes are connected according to the nature of thermoplastic coiled pipes. During hot melt special heating equipment (generally electric heating type) is used to make the connecting surface of coiled pipes of the same material and pipe fittings reach the molten state, safe and durable, and avoids water running, dripping and leakage at the joint of metal pipe fittings.
In general, the process of expanding the diameter of coiled pipe products can be divided into three stages. It is the preliminary rounding stage: the sector blocks are opened until all the sector blocks reach the steel pipe. At this time, the radius of each point in the steel pipe is almost the same within the step range, and the steel pipe is preliminarily rounded. The second stage is the nominal inner diameter stage: the sector starts to reduce the movement speed from the front position until it reaches the required position, which is the inner circumference position of the finished pipe with quality requirements.
The convex hull on the surface of the crimp roll shall be treated. Before repeated processing, the equipment surface shall be treated to prevent the convex hull steel plate with abnormal roll surface from causing pits.