something that I had not answered in my past posts. He wants to know how 904L compares to 316L when exposed to the same oxidants in the environment. I hate it when this subject pops up as I am not too popular for discussing this on the forum!!!!
I must add that I have been offered some 904L Stainless steel Rolex models for my consideration of purchase, where I have opened the backs for general inspection such as condition of the movement and the case as a whole.
I have found that some of these 904L stainless steel models DO HAVE CORROSION & PITTING under the back seals and worse still under the bezel tension ring of submariners. I normally do not buy stainless steel models unless they are at a price where I can service them for a feasible resale value. I cannot keep them even if I wanted to, as I work short term in differnt parts of the globe and not being able to carry a collection with me (as I would have to always pay customs duties). By now customs officers would know me too well to be taxed like a sitting duck waiting to be hunted!!!! LOL!!!!
I have the following link on the former Avesta Sheffied (now known as outokumpu) site which has a corrosion table of different grades of stainless steel versus different chemicals and how they resist or fail against exposture of varying chemicals. For example if one wants to compare how good two different grades of stainless steel resist corrosion/pitting attacks against hydrochoric acid then the following will show the differences;
In that table you can click on whatever chemicals are listed and can make similar comparisons,
Incidently there is a nice story on some """Happy""" owner experiencing a wonderful horror on his 904L Seadweller HEV on;
Hope this has answered your question!! Good Luck!!!