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, 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.
When the pipe is rolled, the distance between the two welds shall be greater than 100mm, and the distance between the outer wall of the outer branch pipe shall not be less than 50mm.
.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, 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, 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, stainless steel 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.
1 carbon structural steel: q215-a, q215-a. & middot; F,Q215-B,Q235-AQ235-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 thick wall coil is made of steel plate. Long term coil, Q235B coil, Q345B coil, large diameter thin wall coil, large diameter thick wall coil, stainless steel coil, L360 coil, 16Mn coil, 20 old brands, with price advantages and quality! Thick wall coil can be divided into two types: hot coil and thick wall coil.
.All continuous pipe welds shall be penetration tested.
High manganese content 6 will make the steel brittle and reduce its plasticity. Under what circumstances does the thick wall coil need to be preheated before welding?
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.
: 90% of the developed thick wall coil processing industry is CNC cutting machine, and only 10% is manual cutting; The CNC cutting machine only accounts for part of the total blanking. 10%, of which the proportion of NC plasma cutting is small. In industrial production, the thermal cutting of thick wall coiled pipe generally includes gas cutting, plasma cutting, laser cutting and so on. Among them, plasma cutting has a wider cutting range than gas cutting More efficient. Fine plasma cutting technology is close to laser cutting in material cutting surface quality, but the cost is much lower than laser cutting. Therefore, since the successful development of the United States in the mid-1950s, plasma cutting has developed rapidly. Professional hot-rolled steel pipe, large-diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, high pressure rating, good waterproof performance, fire and high temperature resistance, strong overload capacity, corrosion resistance, radiation protection and long service life. With the rapid development of computer and digital technology, NC cutting has also expanded and improved the processing accuracy. It shows great advantages in saving materials and improving labor productivity. This leads to the development of plasma cutting technology from manual or semi-automatic to NC, which has become one of the main directions of NC cutting technology. NC plasma cutting technology is a set of high-tech technologies such as NC technology, plasma cutting technology and inverter power supply technology. Its development is based on the common progress of computer, plasma arc characteristic research, power electronics and other disciplines. The CNC cutting technology began in the 1980s, and the CNC plasma cutting technology was later. However, recently, some domestic universities, research institutes and manufacturers have studied NC plasma cutting technology and gradually developed and produced various specifications of NC plasma cutting equipment, narrowing the gap of foreign advanced technology. The large-scale rolling pipe factory of rolling pipe, t-welded rolling pipe, flaw detection welding rolling pipe 16Mn rolling pipe, Q345B rolling pipe and special-shaped rolling pipe, and the t-welded rolling pipe, 16Mn rolling pipe, Q345B rolling pipe and special-shaped rolling pipe produced by the rolling pipe factory are exported to major engineering buildings at home and abroad.
Both internal welding and external welding adopt American Lincoln Electric welding machine for single wire or double wire submerged arc welding, and large-diameter thick wall coil pipe, so as to obtain stable welding specification.
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 pipe must be subject to winding diameter test. If there is no response crack on the surface, 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, the quality of the steel pipe will not meet the response standard. The appearance of cold-rolled seamless steel pipe is shorter than that of hot-rolled seamless steel pipe, 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 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, and complete specifications,. 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, and finally lead to the bias of weld metal.
Which one is better.The production process of thick wall welded pipe can be divided into cold rolling, cold rolling and hot rolling. The steel pipes are made of 10, 20 35 and 45, which are referred to as ordinary steel pipes for short, and 16Mn is between ordinary steel pipes and alloy steel pipes. This material is called low alloy steel pipe the steel pipe materials are 27SiMn, 12Cr1MoV, 10crmo9, 15CrMo and 35CrMo, and the stainless steel pipe is collectively referred to as alloy steel pipe. According to the use, it is divided into structural seamless steel pipe; Seamless steel pipe transportation; Seamless steel pipe for boiler; High pressure seamless steel pipe for boiler; High pressure seamless steel pipe for fertilizer equipment; Seamless steel pipe for geological exploration; Jointed steel pipe; Seamless steel pipe for petroleum cracking; Marine seamless steel pipe; Cold drawn cold rolled precision seamless steel pipe; Various alloy pipes.
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
For external welding, a larger welding current is used. However, under the condition of high welding current, the stirring effect of molten pool is enhanced, and the melting amount of welding wire increases accordingly, resulting in the increase of weld reinforcement, the deterioration of weld formation and poor edge transition.
The rolling pipe factory mainly produces steel plate rolling pipe and thick wall rolling pipe. With the development of domestic economic situation and the acceleration of welding and casting trend, the advantage of NC cutting is gradually recognized. NC cutting not only greatly improves the rate of plate and product quality, but also improves the working environment and labor efficiency. At present, the CNC cutting machines used in the thick wall rolling pipe processing industry are mainly flame and ordinary plasma cutting machines, but pure flame cutting can not meet the needs of modern production, At present, most CNC cutting machines are CNC plasma cutting machines. This type of cutting machine can meet the needs of thick wall coiled pipe plate processing and thick wall coiled pipe parts processing so the demand will be greater and greater, but there is still a very obvious gap with foreign countries, mainly in
ranking.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, 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, it is basically OK. The main problem of the product is the welding quality. The welding quality directly determines the quality of the product, 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.
, large-diameter thick wall coils are factory painted with marks, and large-diameter thick wall coils are in stock. According to this, the process parameters are adjusted at any time to eliminate defects in time.
Continuous pipe products are widely used in petroleum, chemical industry, natural gas transmission, pile driving, heat supply, gas supply and other projects. The detection of thick wall continuous pipe is mainly ultrasonic flaw detection. The longitudinal wall thickness of two cylinders should not exceed two. 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, L360 rolling and 16Mn rolling were analyzed. The offer is in progress. Welcome new and old customers to consult. Prevent surface damage of steel plate.
.During pipe rolling, the surface damage of steel plate shall be prevented. The parts with serious scratches must be polished for transition, hot rolled steel pipe has been widely used, bridge construction, engineering column, large drum and so on. Save materials and labor for the above enterprises, reduce production costs, improve the market competitiveness of finished products, and promote the development of enterprises to a certain extent. Continuous pipe is committed to producing all kinds of circumferential seam, longitudinal circumferential continuous pipe and penstock, and is reformed on the basis of the same specification and model of traditional pipe rolling equipment. 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 8-100mm.
In the process we mentioned, we need to explain each process such as groove. We need to compact both sides of the steel plate with indenter, so as to avoid the formation of peach shaped mouth in the rolling pipe.