Baking on "hard" SS after pickling and passivation?? 1

[jackpot]

All,

I am confused, is it necessary to bake stainless steel parts that have been pickled and passivated? No one seems to be doing it. I'm specifically talking about sheet or wire that has been transformed by cold working into martensite, like full hard (40% red.) 302 SS or 17-7PH in the CH900 condition.

Jack

 

[swall]

When passivation is done with nitric acid, ss parts are not baked. Nitric is such a strong oxidizer that any hydrogen that is formed is immediately oxidized to water. Can't comment about the pickling or the use of other acids (citric) for passivation.