Because the coiled steel pipe plays an important role in construction railway construction and bridge construction, its quality standards are also more important. If you don't understand the quality specifications and standards, it is easy to have an impact. Generally, low cost. The rolling pipe is mainly used for pipes, billboards,Q235B reel, columns, etc.
.The material of thick wall coiled pipe is 10#, 20#, 35#, 45# called ordinary steel pipe and alloy steel pipe.
.Clean the iron oxide scale falling off in the process of plate drum to prevent the iron oxide scale from bonding and the surface of steel plate.
The longitudinal weld of the same barrel part of the coiled pipe shall not be greater than 2.
It is to preheat rather than increase the line energy. Reel needs quality, honest business! Let's talk about our productivity.
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, 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, steel casing, rolling pipe factory and other special products, old brands, price advantages and guaranteed quality. These processes can not be less.
The electric contact pressure gauge is used to press down the pressure of the oil cylinder on both sides of the conveyor to ensure the smooth transportation of strip steel.
The rolled pipe shall meet the specified arc degree, end face deviation, straightness, etc.
Workshop cost.The arc length of the coil calibration template shall be 1 / 6 ~ I of the circumference of the pipe / the gap between the template and the pipe. What is the manganese content of the straight seam coil? Q345B coil, manganese is a common element in structural steel. Manganese in carbon steel is mainly added to the steel water as deoxidizer in the steelmaking process, usually in the range of 0.3-0.8%. In low alloy steel, manganese is a mixed alloy element, and the manganese content in 16Mn steel and 15MnV steel is 2-6%.
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.
Thick wall coiled pipe is a kind of familiar steel. It is widely used in construction and pipeline industry because of its durable performance and excellent quality. Have we known about the packaging process of the frequently used steel? With the development of domestic economic situation and the acceleration of welding and casting trend, the advantages of NC cutting are 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 NC cutting machines used in the thick wall coil 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 NC cutting machines are NC 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, which is mainly reflected in: 90% of the developed thick wall coiled pipe processing industry is digital control 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. Professional hot rolled steel pipe, large diameter thick wall rolling pipe, steel casing, rolling pipe factory to ensure quality, service and quality. Your satisfaction is our pursuit! Welcome to inquire. In industrial production, thick wall coil thermal cutting generally includes gas cutting, plasma cutting, etc. Among them, but the cost is much lower than laser cutting. Therefore, plasma cutting has developed rapidly. With the rapid development of computer and digital technology, NC cutting is also developing, which improves the machining accuracy. Save materials
The rolled pipe shall meet the specified arc degree, end face deviation, straightness, etc.
Welcome calls .The latter stage is called unloading regression. At this time, the sector continues to retract from the circumferential position of the rewind pipe before rewinding, and will eventually reach the initial expanding position, which is the small shrinking diameter of the sector required by the expanding process. In practical application, in the process simplification, the three steps can be combined and simplified, which has no impact on the expanding quality of steel pipe. How to calculate the weight per meter of steel coil? Steel coil belongs to steel pipe so it is combined with general formula when carrying out theoretical weight.
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, oxygen blowing 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
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 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.
The thickness of hot-rolled thick wall coil is generally greater than 20mm, and the outer diameter range is 450-3000mm. The hot-rolled thick wall coil is rolled, welded, formed, ribbed and defect detection under the condition of steel plate heating. Sometimes the wall thickness is relatively thick and secondary heating is required. It is characterized by small outer diameter tolerance and uniform wall thickness. It is important that the hot rolled thick wall coil will not damage the properties of raw materials. The disadvantage of hot roll thick wall rolling pipe is that the treatment time is long. Hot rolled thick wall coiled pipe is widely used: cylinder, hydraulic, bridge, roller, etc.
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.