The pressure resistance of the reducer is the best. However, due to various factors, the actual wall thickness of floor heating pipe is usually in the wall thickness under the various types of pipe can meet the requirements of floor heating, different diameter elbow pipe pressure advantages are not reflected; thermal conductivity: For floor heating pipe needs to have good thermal conductivity, low-temperature heat shock resistance of low-temperature impact performance is better.
The production standard of the different diameter elbow
Elbow Now International standard is the United States national standards ANSIB16.9 and 16.28. The standard OD size range is 1/2〃~ 80〃, general 24〃 within the use of seamless steel tubes for raw materials, 26〃 to 80〃 are stamped with steel plate after welding. Wall thickness up to 60mm, minimum to 1.24mm. The most used steel grades are carbon steel (20#), alloy steel and stainless steel, a total of 24 steel grades. The CrMo steel used in the boiler is 15Cr, and the dosage is larger. Tee, OD range in 2.5〃-60〃, from 26〃-60〃 for welded tee. Wall thickness 28-60mm. Size Head specification range, the general first said the big head specifications, and then the small size, the smallest 0.75〃, head smallest 0.5〃, the largest head 60〃, the largest 48〃,20-60〃 for welding, wall thickness 2.8-4.5mm.
Two, different diameter elbow processing technology
With the continuous development of the world economy, the rising income level, we aim to the international advanced construction and shipbuilding industry and other related industries. Punching elbow to connect the main parts, in this product development areas can assume the responsibility, with world-class technology and set sail. Stamping elbow Pipe processing technology has a certain process, in production in accordance with a certain process technology to produce different diameter elbow can only do small-caliber, if the pipe size is too large, it is difficult to buy the finished product reducer elbow, can only use welded elbow. Due to the welding elbow weld more, all the performance than the different diameter elbow, easy to corrosion leakage. And because the different diameter elbow is a batch production, so the price is cheaper than welded elbow. Now has the casting elbow, can do 316L, anti-corrosion performance is better.
Because most of the pipe used for welding, in order to improve the quality of welding, the end of the Cheng Chengpo mouth, leaving a certain angle, with a certain edge, this requirement is also relatively strict, the edge of how much thick, the angle of the number and the range of deviations have provisions. The surface quality and mechanical properties are basically the same as the tubes. For the convenience of welding, the tubing is the same as the steel of the connected pipe.
The different diameter elbow is made of malleable iron, which is used for water supply pipe, water vapor pipe, gas pipe, oil pipeline connection of different diameter elbow color black, angled curvature, quality excellent wear-resistant, not easy to damage the elbow size of 1/2-10 inch, products are widely used in petroleum, chemical, metallurgy, electricity and other industries piping equipment, installation , supporting and other services. The test result of the different diameter elbow and the pushing elbow the thickness of the outer arc, side arc and inner arc are detected by the measuring instrument, and the curvature radius, the diameter of the port section and the processing allowance of the length are detected by means of the platform marking. The speed of push speeds up the 15mm radius of curvature to increase the speed of 50mm, which increases the radius of curvature.
The wear of the different elbow has been a factor affecting the safe civilization production, and with the continuous development of science and technology, the material has been continuously innovated, and the materials such as cast stone, cast steel, alloy, centrifugal pouring compound ceramics have been appeared successively. The different diameter elbow produces the corresponding development plan in the scientific development, according to the corresponding technical development and performance, in which the pipeline lined with alumina ceramics for its high wear resistance, high hardness, oxidation resistance, corrosion resistance and high resistance to high and low temperature strength performance, has become one of the most widely used wear-resistant materials, occupy the world's special ceramics market share ( Wear-resistant material) of about 80%.
Three, the advantages of the manufacturing process of different diameter elbow
1, the different diameter elbow is suitable in the petroleum, the natural gas, the chemical industry, the electricity and water, the construction and the boiler pipeline system.
2, without the need for tube billet as raw material, can save pipe equipment and mold costs, and can be arbitrarily large diameter and relatively thin wall thickness of carbon steel elbow.
3, due to the above two reasons, can shorten the manufacturing cycle, production costs greatly reduced. Due to the need for no special equipment, especially suitable for on-site processing of large carbon steel elbow.
4. The blank is flat or developable surface, so the material is simple, the precision is easy to ensure, assembly and welding is convenient.
The different diameter elbow is the power of the conventional or special stampingequipment, so that the sheet in the mold directly under the deformation force anddeformation, so as to obtain a certain shape, size and function of product parts production technology. Sheet, mold and equipment are three elements of stampingprocessing. Stamping process is a kind of metal cold deformation processing method. Called cold stamping or sheet stamping, for short stamping. It is one of the main methods of metal plastic processing, and also belongs to material forming engineering technology.
Four, the different diameter elbow's performance
1, long-term pressure-resistant performance, only from the design stress, the GB reducer elbow pressure-resistant performance best. However, due to various factors, the actual wall thickness of the floor heating pipe is usually 2mm. And in this wall thickness under the various types of pipe can meet the requirements of floor heating, different-diameter elbow pipe pressure advantages are not reflected;
2, thermal conductivity: For floor heating pipe needs to have a good thermal conductivity.
3, Low-temperature Heat impact: PE--RT and PEX resistance to low-temperature impact performance is better. During the winter construction, the tubing is not easy to be impacted and ruptured, which increases the flexibility of construction arrangement.
4, environmental protection: PE-RT can be recycled, do not pollute the environment. and PEX can not be recycled will produce two times pollution;
5, processing performance Stability: Pex exist control crosslinking degree and crosslinking uniformity and so on, processing complex and processing directly affect the performance of the pipe.