5D carbon steel pipe bend
The carbon steel pipe bend is a widely used pipe product, and the common ones are 3D carbon steel pipe bend, 5D carbon steel pipe bend, 10D carbon steel pipe bend, etc. So what is a bend? Everyone knows the elbow. The elbow is divided according to its radius of curvature: it can be divided into a long radius elbow and a short radius elbow. A long radius elbow refers to the outer diameter of a tube whose radius of curvature is equal to 1.5 times, that is, R = 1.5D; a short radius elbow refers to a radius of curvature equal to the outer diameter of the tube, that is, R = 1.0D. (D is the elbow diameter and R is the radius of curvature). When R is greater than 1.5, this special elbow is called a bend.
The carbon steel pipe bend is not a single industrial component. Generally, the pipe used in industrial equipment can be called a pipe. Its scope of application is very wide, so its quality requirements are also very high. When making bends, not only must the selection of materials be carefully selected, but the technology must also have high requirements. The bending state of the elbow is complicated in use, and the process is difficult in the bending process, and there are many factors affecting the quality performance. The manufacturing and quality of the elbow and its quality (including mechanical properties and dimensional limit deviation) directly affect the quality. To the safety, reliability and investment of oil and gas transmission pipelines.
What are the methods of 5D carbon steel pipe bend?
1. Stamping method: The pipe end is expanded to the required size and shape with a tapered core on the punching machine.
2. Roller method: The push of the core and the peripheral roller is placed in the tube for the processing of the round edge.
3, bulging method: one is to put the rubber in the tube above the compression with a punch to make the tube convex shape; the other method is hydraulic bulging forming in the middle of the tube is filled with liquid, the liquid pressure drums the tube into the desired shape ripple Most of the production of tubes is used in this way.
4, rolling method: generally do not use the mandrel for the inner edge of the thick-walled tube.
5, forging method: using the forging machine to extend the end or part of the pipe to reduce the outer diameter of the pipe. The commonly used forging machine has rotary type, connecting rod type and roller type.
6. Bending forming method: There are three methods that are more commonly used. Another method called stretching method is called stamping method, the third roller method has 3-4 rollers, two fixed one adjusting roller, and the fixed roller distance is adjusted. The finished pipe fittings are curved.
Finished product requirements for 5D carbon steel pipe bend
The elbow shall have a pressure pipeline issued by the department in charge of quality and technical supervision, and a safety registration certificate issued by the component manufacturing unit. Pipe fittings used in toxic and flammable medium pipeline engineering, components of pipes (pipes, fittings, flanges, remedies, valves, safety maintenance devices, etc.). It shall comply with the provisions of the design documents and the relevant requirements of this specification. The bent pipe should be visually inspected before use. Of course, its appearance is also required to meet the following requirements:
1. No defects such as cracks, shrinkage holes, slag inclusions, folding and heavy skin; should not exceed the negative deviation of wall thickness allowed by the corresponding specifications of the product.
2. The machining accuracy and roughness of the thread, sealing surface and groove should meet the design document requirements or manufacturing standards.
3. Depth of rust, bumps and other mechanical damage.
4. Have product identification.
5D carbon steel pipe bend use precautions for buyers
1. Check the surface quality of the intermediate frequency elbow, and clean the joints without damage. The flat surface is smooth and free of burrs.
2. Measure the depth of the socket and mark the surface of the intermediate frequency bend.
3. Wipe the surface of the product with a thousand knives to clean the surface.
4. Insert the product and the pipe into the heater without rotation at the same time to heat the joint.
5. Heat up to the predetermined time, pull out the pipe and fittings, and form a flange ring around the socket.
The differences between 5D carbon steel pipe bend and elbow
1. Different production processes
In the manufacturing process of the elbow, the cold-bending elbow can be made by using a pipe and directly bent by a pipe bending machine. The elbow can be produced in one time, and the secondary anti-corrosion is not required, but the elbow should be customized by the manufacturer. Anti-corrosion, long ordering period.
2. Different prices
The price of the elbow is lower than that of the elbow, but the price/performance ratio is much lower than that of the elbow. If the elbow without anti-corrosion treatment is easily damaged, everyone knows that I don’t say it, but because it is cheap. In some projects where the requirements are not very high, there are many uses.
3. Different application scope
In the open area, the elbows can be bent. Only the cost is considered. The curved pipe can be cold-bent, and the elbow needs to be hot. Of course, the elbow is expensive. Sometimes elbows must be used in narrow sections, such as stone section trenches, because the radius of curvature of the elbow is small, generally 6D, and the elbow is 40D. At the construction site of the construction site, whether the elbow or the elbow is used, not only the price quality of the elbow and the elbow but also the elbow or the elbow should be considered.
