16Mn coilConst
20# large diamThe 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%.
Application of hot rolled steel pipe: the disadvantage of changing hot rolled steel pipe into seamless steel pipe with fixed specification and model is another major feature of hot rolled steel pipe. In the production process hot rolled steel pipe has been widely used, especially in large equipment such as oil cylinder production, 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.
.The groove sizes of longitudinal seam and circumferential seam of hot-rolled thick wall coiled pipe are different. Therefore, before plate rolling, it is necessary to confirm whether the inner side is upward to ensure the correctness of groove direction.
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 main materials are q23q3420, 435cimo and 42cimo, 16 manganese and 16 manganese capacity. Generally, cold rolled sheet can be used for pipe rolling, and the product standards are GB / t50205-200, GB / t3092-2001, etc. Continuous pipe is widely used in petroleum, chemical industry, natural gas transmission, pile driving,20# welded pipe, urban water supply, heat supply, gas supply and other projects.
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.
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.
It shows great advantages in 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,Q355b thick wall welded pipe, 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. Today, let's discuss the packaging process of lower thick wall coil.
The utility model is characterized in that a T-shaped welded steel pipe needs to be hung when measuring the length. In addition, the photoelectric switch detection also has a certain error, which may require a comprehensive measurement of the circumferential weld butt steel pipe.
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, so even in some large enterprises the above cutting is easy to operate compared with CNC cutting Easy to operate, it is still widely used in small and medium-sized enterprises.
Quotation sheet., low cost. The rolling pipe is mainly used for pipes, billboards, columns, 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 longitudinal weld of the same barrel part of the coiled pipe shall not be greater than 2.
Service specification of coiled steel pipe: there are spiral welded pipe and seamless pipe, and the pressure resistance of gas and water is different.
Service first.The quality of steel rolling pipe is greatly affected by the size of weld, mainly including welding process parameters, shape and position parameters of welding wire, flux flow, flux process performance, forming joint and other comprehensive factors.
Purchasing standards for steel plate coils in the steel market, steel plate coils are popular. What purchasing standards do some users have when purchasing such steel plate coils? The following year old Xiaobian because steel plate coil plays an important role in construction, railway construction and bridge construction, its quality standards are also more important. If it is for quality solution, it is easy to have an impact. Generally, we can purchase from these aspects.
Pipe groove processing and joint pair: when the pipe wall thickness is less than 6mm, it is type I weld; when the pipe wall thickness is greater than 6mm, it is type V weld; For pipes with diameter greater than 600mm and wall thickness greater than 6mm, the bottom of the pipe shall be sealed at the bottom of the pipe; In addition to the lap joint, the other type of gas coil pipe is continuous and solid V-groove butt welding. If the weld is found to be defective, the weld must be re welded. Rewelding shall not be more than twice. The longitudinal weld of coiled pipe in the same cylindrical part shall not be greater than, and the spacing between two longitudinal joints shall not be less than 200mm.
.1 carbon structural steel: q215-a, q215-a. & middot; F,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.
Generally, the packaging process of thick wall coiled pipe mainly includes filling, sealing and other processes as well as related pre and post processes, such as cleaning, stacking and disassembly. Because it is used strictly, the process of thick wall rolling pipe shall be strict, and the production shall be carried out according to the correct methods and principles. In addition, the process of thick wall rolling pipe also includes stamping on the package. The use of mechanical packaging products can improve productivity, reduce labor intensity and meet the needs of large-scale production. Thick wall coiled pipe is developed with the emergence of new packaging materials and the continuous innovation of packaging technology. It can show important value in different industries and fields.
The inspection requirements for thick wall coiled pipe treatment are that the thick wall coiled pipe is made of steel plate. The thick wall coiled pipe can be divided into coiled pipe and hot rolled thick wall coiled pipe. Generally, 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 a cutter and cut into a blank with a length of about meters. 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,. The wall thickness of coiled pipe is 20mm and the outer diameter is 450-3000mm. It is rolled, butted, removed and reinforced directly from the steel plate. Coil processing time is short and delivery is fast.