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The explain for the stainless steel seizing problem on bolts and nuts of SS filter housing.

When respect to the filter housing/ filter vessel, with different working conditions, the material adopt may different, such as SS304, SS316L, etc.

When filter some normal corrosive liquids or some solutions that need to be specially take care, as usual we suggest to use SS316L for safety.

For the design of Zonel Filtech that the material touch with the liquids will adopted the SS316 and some parts not touch with the liquid will adopted the SS304, when we offer this choice, some clients not so understand, suppose we are lower the quality to make the price of our SS filter houses competitive only, which is not true! So we need to do some declaration to our clients as following for reference.

When we processing the stainless steel, especially the bolts and nuts, when we fixing them together, the surface between bolt and nut will increase to a quite a high temperature at a short time (especially when we fixing them fast) , which may hurt the oxidation film on the surface of the accessories, which lead the two parts to seize together.

For avoiding similar problems, sometimes we will grease the stainless steel bolts and nuts, but for the stainless steel filter housing, which is not allowed because it may cause some pollution problem!

While when change the bolts and nuts with different stainless steel model which is helpful to solve this problem perfectly.

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