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Tesla Cybertruck May Have A Rust Problem (www.carsdirect.com)

submitted 9 months ago by L4s to c/technology

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Tesla Cybertruck May Have A Rust Problem::One of the more standout qualities of the Tesla Cybertruck is its bare stainless-steel body. The stainless-steel body gives the Cybertruck a unique design, but

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[–] HootinNHollerin 26 points 9 months ago* (last edited 9 months ago) (1 children)

Stainless has chromium added. Iron is still the main element. Different stainless steels have various other elements added, like molybdenum. There’s a wide range of SS for various purposes depending on their formability, weldability, corrosion resistance, heat treatment or precipitation hardened. Some are mildly magnetic (400 series), others not (300 series). Big range of cost too. Not sure which one they used. There’s also a finishing process called passivation that should be used to reduce the likelihood of corrosion.

[–] [email protected] 2 points 9 months ago* (last edited 9 months ago)

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...