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5454 aluminum alloy heat exchanger of the chemical

Off the corrosion and stress corrosion cracking susceptibility, heat exchangers and piping in the chemical industry tend to have crystalline particles of the fluid flow in a pipe, it is inevitable erosion of the wall have eroded, but the use of pipes made of 5454 aluminum alloy is superior to the mechanical properties pure aluminum, so aluminum alloy 5454 to meet the basic requirements for chemical production, which can be used for chemical heat exchanger tubing and pipe, at present, some chemical companies in the heat exchangers and pipelines, the effect is better. Extrusion temperature and extrusion speed depends on the alloy grades, extrusion optimal temperature range, the possibility of the maximum extrusion speed, surface quality, microstructure and properties of products,[link widoczny dla zalogowanych], product shapes and sizes, extrusion method, extrusion machine capacity and other factors. After a production practice that 5454 tube extrusion temperature is 420-480 ℃. Extrusion speed should be strictly controlled, generally transverse crack pipe does not appear appropriate, but 3.2.3 should be strictly controlled by porthole die lubrication squeeze the tube, in order to ensure the weld quality, therefore, generally in the extrusion process lubrication or dirty does not allow mold, squeeze 35,454 cartridges and aluminum ingot production process. Aluminum casting production process 3.1.15454 3.1 smelting process (1) metal ingredients with 20% of new aluminum alloys an increase of the original system of waste ingredients. Magnesium aluminum add a new part of the 3% upper limit of ingredients according to the original waste burning magnesium remelting should be considered. (2) plus magnesium, should pay attention to the melt temperature to 700 ~ 720 ℃ should be suitable, should not be too high, and be sure to melt the magnesium pressure on people, should not float on the melt surface oxidation combustion; side of stirring added magnesium l. (3) Each blast furnace melting chemical analysis must be carried out before deciding whether feeding (4) to strengthen the coverage, stir. (5) by adding the appropriate A1Ti master alloy grain refinement. (6) Front end of the casting, the time is not more than 4h. (7) The melting temperature was controlled at 720-760 ℃ 3.1.2 Ingot Casting Process Specification: + J521111 \can be arbitrarily selected. Casting temperature: 710 ~ 730 ℃ casting speed :70-9oinm / inirt casting cooling water pressure :0.08-0 .12 MPa3.2 3.2.1 extrusion process extrusion process to determine the program for the production of chemical heat The 5454 aluminum alloy tube, is made of solid ingots for extrusion. Because most manufacturers are using porthole die extrusion 5454 aluminum tubes, also known as extrusion bonding, this process is the use of extrusion axis reaction force passed to the metal, the flow of metal through the front part of the mold was split into two sub- or more strands of metal flow, and then re-convergence of indoor mold welding and welding in the synthesis of high temperature and pressure pipe, obtained by this method to produce hollow products of any shape. So this method in the soft alloy extrusion pipe receive special widely used. Therefore, in 5454 the production of aluminum alloy pipe extrusion using this method, high temperature chemical heat exchanger with 5454 aluminum alloy extruded pipe to reduce the extrusion pressure and improve weld quality and speed of extrusion temperature 3.22 3.2 specification. 4 heat pipes 5454 are aluminum-magnesium alloy, such as after hardening at room temperature,[link widoczny dla zalogowanych], the long-term parking, and easy 8 phase in the supersaturated solid solution from the precipitation,[link widoczny dla zalogowanych], resulting in so-called \.2 declined. To prevent this change, the extrusion work hardening (cold drawing),[link widoczny dla zalogowanych], the 5454 pipe must be 130 ~ 170 ℃ low temperature stabilizing treatment, so that the mechanical properties of 5454 alloy tubes stabilized 5454 aluminum alloy to 4 Conclusion The excellent mechanical properties and corrosion resistance and thermal conductivity characteristics can be used for chemical heat exchangers and pipelines, and achieved good results. As the alloy production process of continuous improvement and improved, and the rapid development of modern industry, 5454 aluminum alloy and the profile will have a broader application. References l Wang Zhu Zhang,[link widoczny dla zalogowanych], Tian Rongzhang aluminum tone will increase L = F List of Changsha: Central South University IlJ edition I Li. 19882 Zhou dish cast aluminum Taijin A J dagger Beijing: Metallurgical I version. 1'tj ~ 7f Editor: Chen Wei-chen). one by one one by one ~ a ~ r ~ ~ ~ one by one \Machinery Industry Press out:; version of book \
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