What is the process of stainless steel screw plating?

What is the process of stainless steel screws plating, stainless steel screws plating is really superfluous, not only the threads do not match well, and more rust-proof, the price is also much more expensive, I do not know who came up with the idea of a dull. It is best to check the relevant information on their own, the Internet is always false, encountered pretend to understand, random response, simply false or fraudulent directly mislead you, and even harm you.