Carbon steel 180 degree pipe elbow
Elbow is a common part in pipeline engineering, which is mainly used for pipeline connection. The elbow can not only connect the pipeline well, but also ensure the good sealing performance of the pipeline. The main specifications of carbon steel elbow are 45 degree elbow, 90 degree elbow and Carbon steel 180 degree pipe elbow. But if there is a special need in engineering, it can also be specially manufactured 60 degree carbon steel elbow.
It can replace the pipeline by removing the flange elbow when the pipeline is damaged, which saves much time. When the pipeline in use may be damaged, when the maintenance workers want to check, the pipeline without flange will have a lot of trouble. In serious cases, it is necessary to saw the pipeline, causing damage to the whole pipeline. For different pipelines, we choose different elbows.
Elbows are often connected with carbon steel pipes. The main connection modes are welding, flange welding, thread welding, socket connection and so on. The general manufacturing process of carbon steel elbow is to transform a welded polygonal polygonal ring shell or a closed polygonal shell with two ends into a circular shell after filling with pressure medium. Carbon steel elbow does not need billet as raw material, which can save part of the cost of pipe making equipment and die. Because the blank is easy to cut and the accuracy is easy to guarantee, the welding resistance is more convenient. In this way, the production cycle is shortened and the production cost is greatly reduced. Carbon steel elbows are mainly suitable for pipeline systems in petroleum, chemical, hydropower and construction industries.
Application Points of Carbon Steel 180 degree pipe elbow
The elbow is often used in the bending part of the pipeline to change the direction of the pipeline. Commonly used are 45 degree elbows and 90 degree elbows. The bending radius is about 1.0 times of the outside diameter of the pipe, which is called short radius elbow, and the long radius elbow is about 1.5 times of the outside diameter of the pipe. In the pipeline system layout, it is generally appropriate to use long radius elbow connection, short radius elbow is usually used in the pipeline installation location is more compact occasions or in order to reduce costs. When using short radius elbow, its working pressure should not exceed 0.8 times of long radius elbow of the same specification. Elbows are usually used in large-sized pipes with low pressure (design pressure s2.0MPa), water and similar fluid medium conditions. When the angle of one section of oblique elbow is more than 45, it is not suitable for poisonous and flammable medium pipeline or pipeline under vibration, pressure fluctuation and alternating load due to temperature change.
Carbon steel 180 degree pipe elbow production process
Carbon steel 180 degree pipe elbow can also be called thick-walled U-shaped elbow, but different usable terms are much the same, almost the same. There are two kinds of thick-walled U-shaped elbows, cold stamping and hot stamping, which are usually selected according to material properties and equipment capabilities. The forming process of cold extrusion elbow is to use a special elbow forming machine to put the tube blank into the external die. After the upper and lower die are closed, the tube blank moves along the gap reserved between the internal die and the external die under the push rod to complete the forming process. The elbow manufactured by cold extrusion with internal and external dies has beautiful shape, uniform wall thickness and small size deviation. Therefore, this process is mostly used in the forming of stainless steel elbows, especially thin-walled stainless steel elbows. The precision of internal and external dies used in this process is high, and the deviation of wall thickness of tube blanks is also demanding.
Advantages of Carbon steel 180 degree pipe elbow hot push process
1. The process is simple and the productivity is high, which can meet the requirements of mass production.
2. This process can avoid the uneven wall thickness caused by the stretching and thinning of the convex edge of the tube wall and the increasing of the pressure on the concave edge of the tube wall during the traditional tube bending process.
3. The elbow with large radius and thick wall (t/D < 0.015) with uniform wall thickness can be produced by this process. Among them, t is thickness and D is billet diameter, which can not be achieved by other elbow processes.
4. The elbow has good mechanical properties because the metal structure is compact due to the pressure in the axial direction during push-bending process. Some pipes require hot bending to obtain good mechanical properties.
5. With this technology, bending pipes with the same caliber of 30, 45, 60, 90, etc. can be produced once on the same horn mandrel, and the production efficiency is high.
6. Because of rapid heating and high thermal efficiency, the surface of elbow has less oxide scale.
