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During pipe rolling, the surface damage of steel plate shall be prevented. The parts with serious scratches must be polished for transition, and the wall thickness of the polished parts shall not be less than the design wall thickness.
.The common standards for thick wall coiled pipes are generally divided into: (ministerial standard, also known as spiral submerged arc welded steel pipe for ordinary fluid transmission pipeline), (national standard, also known as oil and gas industry transmission steel pipe (up to now, the requirements are strict (American Petroleum Association, also known as pipeline steel pipe; which is divided into two levels PSL1 and PSL2), (spiral welded steel pipe for pile) The Ministry of petroleum has set up standard Pandu pipe, oil and gas industrial transmission steel pipe, spiral seam high-frequency welded steel pipe for general low-pressure fluid transmission. The hot-rolled steel strip coil is used as the pipe blank, and the spiral seam high-frequency welded steel pipe for high-frequency lap low-pressure fluid transmission is used. The spiral welded steel pipe for pile is hot-rolled steel strip coil as the pipe blank, which is often warm spiral formed, and double-sided submerged arc welding is used Connecting or high-frequency welding of steel pipes for building structures, docks, bridges and other foundation piles. Q235B steel pipes bring great convenience to our life. For example, we use water or water in our daily life. If supported,Q235B large diameter thick wall welded pipe, these things will not be easily used. Although the pipeline system is used in the transportation industry, rolling pipe, Q235B rolling pipe, Q345B rolling pipe, large-diameter thin-wall rolling pipe and large-diameter thin-wall rolling pipe Large diameter thick wall coil, L360 coil and 16Mn coil have high pressure resistance, good waterproof performance, fire and high temperature resistance, strong overload capacity, corrosion resistance, radiation protection and long service life, which has brought great support.
API seamless steel pipe is expressed as outer diameter, wall thickness and thick wall seamless steel pipe, which is mainly used for machining,Q460b thick wall coiled pipe, coal mine hydraulic steel and other purposes. Classification of thick wall seamless steel pipe & mdash& mdash; Hot rolled thick wall seamless steel pipe, cold rolled thick wall seamless steel pipe, thick wall seamless steel pipe, stainless steel seamless steel pipe for pipe jacking structure (GB / t14975-199) are widely used in corrosion-resistant pipes and structural members in chemical, petroleum, light textile, food, machinery and other industries, and stainless steel hot rolled (,) and cold drawn (rolled) Seamless stainless steel pipe for fluid transportation (GB / t14976-199) is a hot-rolled (extruded) and cold drawn (rolled) seamless steel pipe made of stainless steel for fluid transportation.
.Due to the continuous application of thick wall coiled pipe in industry and the continuous expansion of its scope, it has many advantages. In order to prevent the thick wall coiled pipe from rusting we can apply antirust oil on the surface of the thick wall coiled pipe.
The butt joint of coiled pipe (with the same wall thickness) shall not exceed 10% of the wall thickness and not more than 2mm.
The distance between the two longitudinal slits of the reel group shall be greater than 100mm. The outer wall of the branch pipe shall be longitudinal, and the circumferential weld shall not be less than 50mm.
1800mm steel pipe elbow detailed introduction to elbow: first of all, the material is hot pushed, the pusher is a horn shaped core or mandrel, the mandrel is thickened and thickened, the process of pushing the elbow is the process of expanding the diameter, and it is supported on the back. The material tube part passes through the mandrel, and there is an arched frame at the rear to fix the mandrel. There's a car in the middle. Some cars are driven hydraulically, others are driven by mechanical transmission, that is, screw drive, and then the car pushes forward, and the car pushes the pipeline along the core. The rod moves forward, and then the trolley pushes the tube down and processes one.
The materials of steel pipes are 10#, 20#, 35#, 45# called ordinary steel pipes. Sometimes thick wall coiled pipes have two welds. Why this happens is mainly due to the problems of raw materials and equipment processing. Professional projects include: hot rolled steel pipe, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory and other related businesses. Merchants who hope to have this business please. The steel plate with the required width of welded pipe required by customers is generally not produced by the steel factory, so the two plates must be welded, so this kind of weld occurs. The main problem of thick wall coiled pipe is welding. As long as the flaw detection can be carried out, the delivery can be carried out. The relevant requirements are broader than other products. The detection of thick wall coiled pipe is mainly ultrasonic flaw detector, and the longitudinal weld on the same cylinder section of coiled pipe should not be more than two. The group of butt welds of coiled pipe shall be flush. When the nominal diameter is greater than, back sealing welding shall be carried out in the pipe. During pipe rolling processing, the surface damage of the plate shall be prevented. High cost. Hot rolled thick wall coiled pipe is widely used: oil cylinder, hydraulic pressure, bridge, roller, etc& amp; amp; quot; Compared with seamless steel pipe, thick wall coil has the disadvantages of low cost, rapid delivery, breaking the fixed specification of seamless steel pipe, etc. Quality department 3 editing of welding process and welded pipe type thick wall coiled pipe is made of steel plate or steel strip after bending and then 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, wire sleeve, metric welded pipe, idler pipe deep well pump pipe, automobile pipe transformer pipe, electric welding thin-wall pipe, electric welding special-shaped pipe and spiral welded pipe. Objective knowledge packaging strategy thick wall steel plate coil - thick wall steel plate coil price thick wall coil is formed by bending steel plate or steel strip, and the electrical model is
Deviation reel as follows (unit: mm): nominal diameter & amp; amp; lt; 800 800 to 1200 1300 to 1600 1700 to 2400 2600 to 3000 perimeter Deviation & plusmn; 5± 7± 9± 11± The ovality is 1% of the outer diameter,Q235B welded steel pipe, and the quality of no more than 4 steel plate coils is greatly affected by the weld size, mainly including the comprehensive factors such as welding process parameters, welding wire shape and position parameters flux flow, flux process performance and formed joint.
Potential development.The second stage is called the complex compensation stage, that is, the sector of the coiled pipe will gradually reduce its speed until it reaches the required position, which is the inner circumference position of the steel pipe before complex required by the process design. The second stage is the pressure maintaining and stability stage: the sector block remains stationary at the inner circumference of the steel pipe before re assembly, which is the pressure maintaining and stability stage required by the equipment and expanding process.
Gas and other projects.
The main problem of thick wall coiled pipe is welding. As long as flaw detection can be carried out, the requirements related to delivery are wider than other products. The detection of thick wall coiled pipe is mainly ultrasonic flaw detector.
The rolling pipe production technology requires that the rolling pipe weld is a double-sided weld, two longitudinal welds are allowed, and the weld spacing exceeds 300 mm. The welding appearance and quality standard shall not be lower than the level standard in the welding specification.
Safety production.First select the specification and put forward the pipe, such as 90 & deg; Elbow, which can calculate the curvature to calculate the 90 DEG of the long material; Elbow, it has been widely used in steel pipe production. According to the different process requirements of steel rolling manufacturers, the steel pipe length measurement system has a variety of length measurement methods. The main points are as follows: the basic principle of grating ruler length measurement is: two fixed length grating rulers are set outside both ends of high-frequency welded continuous pipe, and the rodless oil cylinder drives the grating ruler close to both ends of the steel pipe to realize the interference measurement of the length of the steel pipe.
Diameter of rolled steel pipe: sometimes the diameter of the demand plan is different from that of the supplier.
.The wall thickness of general coiled pipe is 20mm and the outer diameter is 450-3000mm. It is made of steel plate by direct rolling, welding and forming. The production process of general thick walled coiled pipe can be divided into cold drawing and hot rolling. The production process of cold rolled seamless steel pipe is generally more complex than hot rolling. Roll sizing test shall be carried out for pipe blank first. If there is no response crack on the surface, the round pipe shall be cut by cutting machine, Cut into blanks about meters in length. However, when entering the annealing process, acid shall be used for annealing, it indicates that the quality of steel pipe can not meet the response standard. In appearance, the cold-rolled seamless steel pipe is shorter than the hot-rolled seamless steel pipe, and its wall thickness is generally smaller than that of the hot-rolled seamless steel pipe, but the surface is brighter than that of the thick wall seamless steel pipe. There is not too much roughness on the surface and there are not too many burrs in the diameter. The thick wall coiled pipe is a powerful manufacturer, quotation, honest operation, genuine and of the same quality. The thick wall coiled pipe is available from stock, with complete specifications,. Docking and strengthening. Coil pipe processing time is short and delivery is fast Low cost. The rolling pipe is mainly used for pipes, billboards, columns, etc.
This measurement method overcomes the problem of steel
The pipeline installation sequence shall be adopted according to the principle of zoning and subsystem. First the lower level, then the upper level, and then the difficulty. In principle, the pipes connected to the machine are arranged from inside to outside to reduce the impact of welding stress on the installation accuracy of the machine. The joints of indoor and outdoor pipes shall be left outdoors. Q345B thick wall continuous pipe is a widely used carbon steel material. Q345B thick wall continuous pipe with thickness greater than 10mm is widely used in drainage engineering, sewage pipeline, dredging pipeline, construction pipeline, etc. Q345B thick wall continuous pipe is a welded steel pipe product with relatively simple and flexible process. This kind of steel pipe is usually not in stock and is customized. If the quantity is small, delivery related requirements can be compared with other products.