Q235 Threaded flange is a kind of flange connected with pipe by thread. In design, it can be treated as loose flange. The utility model has the advantages that welding is not required, and the additional torque generated by flange deformation on the cylinder or pipeline is very small. The disadvantage is that the Q235 Threaded flange is thick and the cost is high. It is suitable for the connection of high pressure pipeline.
Q235 Threaded flange is a kind of non welding flange, which processes the inner hole of flange into pipe thread and connects with the pipe with thread. Compared with flat welding flange or butt welding flange, Q235 Threaded flange has the characteristics of convenient installation and maintenance, and can be used in some pipelines that are not allowed to be welded on site. Alloy steel flange has enough strength, but is not easy to weld, or welding performance is not good, can also choose Q235 Threaded flange. However, when the temperature of the pipeline changes sharply or the temperature is higher than 260 ℃ and lower than - 45 ℃, it is recommended not to use Q235 Threaded flange to avoid leakage.
There are two types of Q235 threaded flanges. A kind of threaded flange with low nominal pressure is generally used in galvanized steel pipe and other places where it is not suitable for welding, and it is not suitable for pipes with repeated temperature fluctuation or above 260 ℃ and below - 45 ℃. The other is used for high pressure condition, using two tube ends with external thread and machined into a certain shape sealing surface with lens gasket to seal. This kind of flange used to be used in synthetic ammonia production. In addition, Q235 Threaded flange should be avoided on any piping where crevice corrosion, severe erosion or cyclic loading may occur.
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