What are the selection principles for the last 4 digits of metal wound gaskets?
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I would like to ask the experts: are there any principles regarding the materials used for the outer ring, metal strips, filler strips, and inner ring of metal wound gaskets? Are there any guidelines or references I can consult? Thank you very much
The selection principle for the last four digits of metal wound gaskets mainly takes into account the corrosivity of the medium, operating temperature, pressure, and the condition of the sealing surface. Generally, the material of the outer ring needs to be corrosion-resistant; stainless steel and similar materials are chosen for this purpose ； The metal strip and filler strip must be suitable for the working conditions; common materials include stainless steels such as 304 and 316 ； The inner ring is typically used in situations requiring high temperature resistance or protection against corrosion by media, and corresponding heat-resistant and corrosion-resistant metal materials are chosen for its construction. When making a specific selection, it is best to refer to relevant standards such as GB/T 4622.2-2009 or the material comparison tables recommended by the manufacturer. .
I have a question: Stainless steel and carbon steel tend to corrode when in contact with each other, so why can stainless steel wound gaskets be used between them? Thank you for the reply.
Stainless steel and carbon steel do not come into contact; a layer of filler (such as graphite) separates them.