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Tesla Cybertruck May Have A Rust Problem
(www.carsdirect.com)
This is a most excellent place for technology news and articles.
You are absolutely right, just for clarity:
Chromium needs to be > 12 weight-%. If you take 18 w-% Cr and 8 w-% Ni you get an austenitic steel which is (normally) neither magnetic nor able to be hardened.
And if you add 12 w-% Cr, you remove 12 w-% Fe. So formally this is right-ish too...