orrosion resistance of stainless steel flange

orrosion resistance of stainless steel flange
Among various pipe materials, the corrosion resistance of stainless steel flanges is the best. Because the stainless steel flange can passivate with the oxidant, a tough and dense chromium-rich oxide protective film Cr2O3 is formed on the surface, which effectively prevents the further oxidation reaction from occurring. Stainless steel flanges will not be uniformly corroded like carbon steel, and no protective coating is required during use.

Stainless steel flange vacuum requirements

Stainless steel flange vacuum seal mainly includes rubber seal, metal seal and magnetic liquid seal. Among them, metal seals can meet the requirements of ultra-high vacuum, but have the following shortcomings: metal seals have poor elasticity and require a large sealing force; poor reusability; high requirements for roughness and matching accuracy of flange sealing surfaces and knife edges; The thermal expansion coefficient of the sealing ring and the flange material is quite different, which is easy to cause local deformation and cause air leakage.

Common interface leakage treatment methods for carbon steel flanges:

Appropriately increase the preload;

　　1) The gasket is plastically deformed after long-term use

　　 Treatment method: Replace;

　　2) Aging, cracking and deterioration of gaskets

　　 Treatment method: Replace.

　　3) The roughness of the flange sealing surface does not meet the requirements

　　 Treatment method: repair;

　　4) The flange plane is not flat or there are scratches on the horizontal plane
　　 Treatment method: repair;
　　5) Cold and thermal deformation and mechanical vibration, etc.
　　 Treatment method: improve the environment or material selection;
　　6) Deformation and elongation of flange connecting bolts
　　 Treatment method: The material and the allowable torque cannot be exceeded.

Advantages of carbon steel flanges

Carbon steel flanges have different hardness and strength in utilization and production, which ensures that they can play an important role and cost in utilization. Carbon steel flanges of different materials can probably play different advantages and characteristics in utilization, and low carbon steel has good plasticity and low strength.

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