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[stevec]

I read this
" The second most popular type of stainless, after Type 304, is Type 316. In Type 316 stainless, the chromium content is lowered
from 18% to 16%, however, the nickel content is raised to 10% and 2% molybdenum is added to the mixture.
This change in the chromium/nickel ratio and the addition of the molybdenum increases the resistance to chlorides.
This is why Type 316 stainless is often used in more corrosive environments where the material will be exposed to
chemical, solvent, or salt water corrosion and makes it the preferred material for marine construction. " in the following link
http://www.portlandbolt.com/faqs/2010/06...ess-steel/