Q355b thick wa
Q355b reelHow When the nominal diameter is greater than or equal to 600mm, back welding shall be carried out in the pipe.
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 principle of encoder length measurement is to install an encoder at the oil cylinder, the oil cylinder pushes the welded steel pipe to move on the roller table, and a series of photoelectric switches with equal distance are installed on the other side. When the steel pipe is pushed by the oil cylinder and the pipe end touches the photoelectric switch, the distance of the oil cylinder can be converted from the recorded encoder reading, so that the length of the steel pipe can be calculated.
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, we can purchase from these aspects.
.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.
The diameter of large-diameter thick wall coiled pipe is generally above dn450. Long term supply of hot rolled steel pipe large diameter thick wall rolling pipe, thick wall straight seam rolling pipe, steel casing, rolling pipe factory, price advantage and quality guarantee! Sometimes there are two welds for large-diameter thick wall coiled pipe. Why does this happen? It is mainly due to the problems of raw materials and equipment processing. The steel plate with the required width of large-diameter welded pipe required by the customer is not produced by the steel plant, so the two plates must be welded, so this kind of weld occurs. The main problem of large-diameter thick wall coiled pipe is welding. As long as the flaw detection can be carried out, and the longitudinal weld on the same barrel section of the 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.
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, 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,. 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.
The longitudinal weld of the same barrel part of the coiled pipe shall not be greater than 2.
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, 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, manager of the Department X100 straight seam submerged arc welded pipe and spiral seam. Jia Qifeng, welcomes you at any time!.
In addition, when the pipe rolling equipment is made, we should not have more than two longitudinal welds on the same cylinder section of the pipe rolling. For long-term pipe rolling, Q235B pipe rolling, Q345B pipe rolling, large-diameter thin-wall pipe rolling, large-diameter thick wall pipe rolling, stainless steel pipe rolling L360 pipe rolling and 16Mn pipe rolling, the products are complete, the quality is excellent and the price is favorable. The distance between the two longitudinal welds should not be less than 200.
Supply chain quality management.The steel plate coil adopts the secondary forming process. When rolling, first bend both ends of the steel plate,Q345B large diameter thick wall welded pipe, and the diameter shall be less than the diameter of the coiled pipe. Then adjust the bed pressure, rolling two to three times steel pipe coiled pipe welding and strengthening the rolling pipe joint long-term rolling pipe, Q235B coil pipe, Q345B coil pipe large diameter thin wall tube, large diameter heavy wall coil pipe, L360 coil pipe, 16MN coil pipe and other brand products, designated products are complete, quality assurance. Then transported to the welding platform for welding.
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.
Continuous pipe is committed to producing all kinds of circumferential seam, longitudinal circumferential continuous pipe and penstock,Q460b thick wall coiled pipe, and is reformed on the basis of the same specification and model of traditional pipe rolling equipment.
Thick wall coiled pipe is made of steel plate. Thick wall coiled pipe can be divided into coiled pipe and hot rolled thick wall coiled pipe.
middleman.The influence of welding process parameters on welding current mainly includes two aspects: according to the production characteristics of spiral steel pipe, small welding current is usually used for internal welding
2PE / E shall comply with SY / t0413-2002 (test) technical standard for polyethylene outer coating of buried steel pipeline
Weight per meter of steel plate coil = (outer diameter wall thickness) * wall thickness * 0.0246615 steel plate coil is made of steel plate. Thick wall t-welded coil can be divided into coil and hot rolled thick wall coil.
.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;.
Cold rolled thick wall continuous pipe is similar to cold rolled thick wall continuous pipe, with wall thickness of 20mm and outer diameter of 450-3000mm. Steel plate is directly rolled, welded, butted and reinforced. Cold rolled thick wall pipe has the characteristics of short processing time,45# large diameter thick wall coiled pipe, fast delivery and low cost. Cold rolled thick wall pipe is mainly used for: pipe, billboard, column, etc.
In fact, the surface pit of the coiled pipe is almost caused by the sparse iron oxide scale on the surface of the steel plate. In general, we can apply the following methods for prevention.