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So I went looking........
430
A ferritic steel, grade 430 forms easily but does not resist extreme temperatures or corrosion well. It’s often used for decorative purposes such as automotive trim. Grade 430 stainless steel is also commonly used in backyard barbecue grills. It is less expensive than grade 304 since it does not contain nickel.
So Musk uses the cheapest SS and then wants a fortune for the vehicles. 
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