From the Society of Automotive Engineers article: "'Tesla’s strategy with this truck is very interesting," observed Dr. David Matlock, professor emeritus at the Colorado School of Mines’ Advanced Steel Processing and Products Research Center. Reviewing Musk’s public comments on Cybertruck online, Matlock surmises that the material is 'very likely a modified version of the lean-alloyed austenitic 301 alloy.'"
Two other things line up for me: the rate of rust is right and I think if they were using 304 they'd want to advertise it as 304, not 30X.
I don't think we should say "it's 301" based on the "surmising" of a 3rd party who didn't look at the steel itself but rather "reviewed musk's public comments".
He could very well be right, but that is definitely speculation rather than fact.
Well I haven't done the depth of research he has, but I believe a key piece of evidence is that in the initial Cybertruck announcement Musk said the Cybertruck uses the same steel as Starship. At that time, Starship prototypes were using 301.
From the Society of Automotive Engineers article: "'Tesla’s strategy with this truck is very interesting," observed Dr. David Matlock, professor emeritus at the Colorado School of Mines’ Advanced Steel Processing and Products Research Center. Reviewing Musk’s public comments on Cybertruck online, Matlock surmises that the material is 'very likely a modified version of the lean-alloyed austenitic 301 alloy.'"
Two other things line up for me: the rate of rust is right and I think if they were using 304 they'd want to advertise it as 304, not 30X.