ronan
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Even cutting stainless on a guillotine used for mild steel csn contaminate the edge. Brushing a weld with a none stainless wire brush etc.
The best stainless work us done in separate work spaces with separate tools
Different crades for different purposes,, its only defined by the amount of chromium As stainless In the tool steel grades d2 is not a stainless being just under yhe mark but its non the less very corrosion resistent but 440 is, stainless and can rust just not as serve
Had to go on a course in Sheffield over 30years ago at thier stainless lab memory fades as i dont do much stainless at all now - sort of grew to hate tge stuff i feel
I bead blasted stainless components in a blast cabinet that had previously been used to blast mild steel, the mild was not rusty or anything, just barely discoloured and was beaded to get it fresh again. The stainless ended up with rust spots on them, you cannot be too careful with the stuff.