chrome in stainless steel

  1. 47,086 Posts.
    I was reading about stainless, trying to find out why my submersible bore pump corrodes. According to wiki: Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion and blocks corrosion from spreading into the metal's internal structure. There would certainly be no O2 deep in a bore.

    Note the chrome! I'm confused. :)

    Doesn't stainless use Ni? If it does indeed contain 10% chrome, who mines it and why isn't it's price of interest?
 
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