Q345B welded p
Q345B large diIf 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, 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.
Thick wall coiled pipe is made of steel plate. Thick wall coiled pipe can be divided into coiled pipe and thick wall coiled pipe. The wall thickness of coiled pipe is 20mm and the outer diameter is 450-3000mm. It is rolled, welded, formed, butted removed and reinforced directly from the steel plate. Coil pipe processing time is short and delivery is fast Low cost. The rolling pipe is mainly used for pipes, columns, etc.
.For the natural gas pipeline of large-diameter steel plate rolling pipe manufacturer, spiral seam high-frequency welded steel pipe for pressure fluid transmission, spiral seam high-frequency welded steel pipe welded by high-frequency lap welding method, and spiral seam high-frequency welded steel pipe for pressure fluid transmission. The steel pipe has strong pressure bearing capacity, good plasticity and is easy to weld and process. The spiral seam submerged arc welded steel pipe for general low-pressure fluid transmission is made of double-sided automatic submerged arc welding or single-sided submerged arc welded steel pipe for general low-pressure fluid transmission such as water, gas, air and steam. With the planning and construction of many major pipeline projects, large deformation pipeline steel, High value-added products such as high-grade hot bends and thick low-temperature pipe fittings. Q235 welded steel pipe and its standard classification: spiral seam submerged arc welded steel pipe for pressurized fluid transmission) is mainly used to transport oil, showing good market competitiveness and large market demand. However domestic enterprises have made slow progress in developing this series of products. They should develop high value-added and large deformation pipeline steel and hot bend steel suitable for industrial application as soon as possible, Steel for low temperature pipe fittings for pipeline station, X100 straight seam submerged arc welded pipe and spiral seam. Jia Qifeng, manager of the Department, welcomes you at any time!.
Continuous pipe products are widely used in petroleum, chemical industry, natural gas transmission, pile driving, urban water supply, heat supply, gas supply and other projects. The detection of thick wall continuous pipe is mainly ultrasonic flaw detection. The longitudinal weld of the same barrel section of thick wall continuous pipe shall not exceed two passes. The butt weld of thick wall continuous pipe shall be flush with the. When the nominal diameter is larger than, back sealing welding shall be carried out in the pipe. In the process of pipe rolling, the rolling quality of pipe, Q235B rolling, Q345B rolling, large diameter thin wall rolling, large diameter thick wall rolling, stainless steel rolling, L360 rolling and 16Mn rolling were analyzed. Professional hot rolled steel pipe, large diameter thick wall rolling pipe, steel casing, rolling pipe factory, large quantity, excellent quality and low price, fire resistance - Waterproof - high temperature resistance, strong and durable, safe and reliable
.Profiled seamless steel pipe is the general name of API seamless steel pipe with other section shapes except circular pipe. According to the shape and size of steel pipe cross section, it can be divided into profiled seamless steel pipe with equal wall thickness (code D), profiled seamless steel pipe with unequal wall thickness (code BD) and profiled seamless steel pipe with variable diameter (code) Special shaped seamless steel pipe is widely used in various structural parts, tools and mechanical parts. Compared with circular pipe, special-shaped pipe has large moment of inertia and section modulus, and has large bending and torsion resistance, which can greatly reduce the structural weight and save energy
Welding voltage because the welding arc is conical and the welding voltage directly affects the length of the arc. Therefore, the production process of thick wall 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 the pipe blank first. If the surface does not respond to the crack, the round pipe shall be cut by cutting machine to cut the blank with a length of about meters. However, when entering the annealing process, acid shall be used for annealing, and attention shall be paid to whether a large number of bubbles are generated on the surface. If a large number of bubbles are generated, 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,. With the increase of welding voltage, the arc length increases, the moving range of arc spots expands, the weld pool widens, it will only change the width of the weld without affecting the edge transition of the weld. However, large-diameter thick wall coils, thick wall straight seam coils, steel casings and quality assurance of pipe rolling factory. New and old customers are welcome to consult during the preferential activities. It can be seen that the larger the welding voltage is, the wider the molten pool is, the more serious the trend of lateral flow of weld metal will be, * which will eventually lead to the bias flow of weld metal.
The butt joint of coiled pipe (with the same wall thickness) shall not exceed 10% of the wall thickness and not more than 2mm.
Meet the following requirements: 1. The longitudinal joint of butt joint shall not be greater than 10% of the wall thickness plus 2mm,16Mn large diameter thick wall welded pipe, and shall not be greater than 3mm. 2. The longitudinal joint of joint 200mm away from the pipe end shall not be greater than 2mm. 3. Other parts shall not be greater than 1mm. 4. The vertical deviation between the end face of coiled pipe and the center line shall not be greater than percent of the outer diameter of pipe and shall not be greater than 3mm. The straightness deviation shall not exceed 1mm / m. 5 the weld cannot be double-sided molded coiled pipe. When the nominal diameter is greater than or equal to 600mm, the particle size and proportion design of rinse agent is very important. The roughness is too large, which may cause the anti-corrosion layer to become thinner at the peak of the cloud path. At the same time, because the cloud path is too deep bubbles are easy to form in the process, which seriously affects the performance of the layer.
During the polishing process, a thick layer of iron, nickel and other impurities will be deposited on the surface of the cathode lead plate, which will affect the conductivity of the cathode surface of the steel coil tube, resulting in the decrease of current, the negative removal of the polished surface, and seriously affect the polishing quality. Therefore, the deposits on the cathode plate shall be removed in time. Sometimes a hard thick film is formed, which can only be removed by knocking and then washed clean, so as to ensure why there are two longitudinal welds in the same pipe section?
Gas and other projects.
consumption.The function of parameters of pipe rolling equipment is improved by 30%, which fills the gap that can not be produced by traditional steel rolling equipment. It can produce steel pipes with diameter of more than 400 and wall thickness of 4-100mm. The main materials are q23q3420, 435cimo and 42cimo, 16 manganese and 16 manganese capacity. Generally speaking, cold-rolled sheet can be used for pipe rolling. Product standards: GB / t50205-200 GB / t3092-2001, etc.
After pushing, the elbows should be formed in this hot state, because some elbows will be distorted after improper handling which is not allowed. In addition, after pushing the head, the outer diameter of the front end is usually large and formed by the forming die. The forming die is actually a press. It must have a set of molds, two semi arcs, one on each side. The outer diameter after forming reaches the size of the finished product.
It should be noted that in practice, it is difficult to achieve the ideal proportion of metal sand and metal ball in the rinsing agent, because the hard and brittle metal sand has a higher crushing rate than the metal ball. For this reason, the mixture should be sampled continuously and the mixed rinse should be tested. According to the particle size distribution, the new rinse agent is added to the cleaning machine, and the amount of metal sand is usually the same in the new rinse agent.
The inner diameter of 1800mm steel plate coiled pipe elbow is 1800mm, the bending radius is also 1800mm, four bends, the material thickness is 4mm, and the bending is 90 & deg;.
Inspection items.Thick wall coiled pipe is usually higher than dn450. Thick wall coiled pipe is sometimes two welds. Why does this happen mainly because of raw material problems and equipment processing problems? The steel plate with the required width of welded pipe required by the customer is usually not produced by the steel plant, so two plates need to be welded, so the weld will occur. 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 longitudinal weld on the same cylindrical part of the coiled pipe shall not be greater than 2. When the coil pipe is butt welded, the corresponding parts shall be flushed to. When the nominal diameter is larger than the inner seal, the bottom seal welding shall be carried out. The surface of the circuit board shall be protected from damage during tube rolling treatment.
How is the strength grade of thick wall coiled pipe specified?
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,Q550b large diameter thick wall coiled pipe, 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.
.The process of thick wall straight seam coiled pipe is generally rolled. If the diameter required by the customer is particularly large, it is difficult for general machinery and equipment, so it is necessary to use coiled pipe. First, after the steel plate is rolled, then weld the two rolled steel pipes. The weld is also called T-welding. Sometimes, the large diameter thick wall straight seam steel needs to roll and weld the two steel plates, Therefore, there may be two welds on a pipe body, also known as double welds. Thick wall straight seam coiled pipe has a wide range of materials. As long as it is a steel plate that can be ordered in a steel plant, which is the main step in the thick wall rolling pipe. It is suitable for columns for bearing steel structures such as buildings, bridges, dams and offshore platforms, super long-span building structures and electric pole tower and mast structures requiring wind resistance and earthquake resistance.
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, and the application field is relatively wide, 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.
1 carbon structural steel: q215-a, q215-a. & middot; F,20# large diameter reel,Q215-B,Q215-B· F,Q235-A,Q235-A· F,Q235-B,Q235-B· F. Q235-c ordinary carbon steel: B2 BY2 B2F by2f B3 by3 B3F by3f a2ay2 a2f ay2f A3 ay3 A3F ay3f2 high quality carbon steel: 10 15 20 transmission shaft steel 3 low alloy structural steel: 123mn 16Mn 19mn 08ti 10ti15ti4 special purpose steel plates are stacked in the open air to prevent rain from causing steel plates. The oxide scale falling off the surface of steel plates is easy to turn into blocks or clusters and adhere to steel plates or crimping rollers, When repeatedly pressed, the coiled pipe forms pit defects.