Product Name：Stainless Steel DIN Large Diameter Steel Pipe Flange
Platetype flat welding flange (chemical standard HG20592, national standard GB/T9119, mechanical
JB/T81) : convenient to draw, simple to manufacture, low cost, and widely used; However, the rigidity.According to the type of flange connection, it can be divided into: plate flat welding flange, neck flat welding flange, neck butt welding flange, socket welding flange, threaded flange, flange cover, neck butt welding ring loose flange, flat welding ring loose flange, ring groove face flange and flange cover, large diameter flat flange, large diameter high neck flange, spectacle blind plate, butt welding ring loose flange, etc.
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What are the factors affecting the performance of large flanges
In the production of large flanges, there are many factors that affect the performance of large flanges. Below we will talk about several common factors. The first is annealing temperature (annealing temperature is the temperature parameter when the primer and template are combined. When 50% of the primer and The temperature at which the complementary sequence appears as a double-stranded DNA molecule. It is a more important factor affecting the specificity of PCR. In an ideal state, the annealing temperature is low enough to ensure that the primers anneal to the target sequence effectively, and at the same time high enough to reduce Non-specific binding. The reasonable annealing temperature ranges from 55°C to 70°C. The annealing temperature is generally set 5°C lower than the primer Tm.
Whether to reach the specified temperature Annealing temperature reaches the required temperature. The treatment of large flanges generally adopts solution heat treatment, which is called "annealing", and the temperature range is 1040~1120°C (Japanese standard). You can also observe through the observation hole of the annealing furnace. The large flange pipe fittings in the annealing zone should be in an incandescent state, but no softening or sagging appears.
The second is the sealing of the furnace body (the shell is welded by steel plate and section steel, and the trolley is welded by section steel and steel plate. The trolley reduces heat radiation and convection loss through soft contact with the furnace lining and sand sealing mechanism, and effectively guarantees the sealing of the furnace body. ), the bright annealing furnace should be closed and isolated from the outside air; if hydrogen is used as the protective gas, only one exhaust port is open (used to ignite the discharged hydrogen). The method of inspection can be wiped with soapy water on the joints of the annealing furnace to see if it is out of gas; the easiest place to outgas is the place where the annealing furnace enters the pipe and the place where the pipe exits. The sealing ring in this place is particularly easy to wear. Always check and change frequently.
The second is the protective gas pressure. In order to prevent micro-leakage, the protective gas in the furnace should maintain a certain positive pressure. If it is hydrogen protective gas, it is generally required to be above 20kBar. Annealing atmosphere: Generally, pure hydrogen is used as the annealing atmosphere. The purity of the atmosphere is preferably above 99.99%. If the other part of the atmosphere is an inert gas, the purity can also be lower, but it must not contain too much oxygen and water vapor.
