Stainless steel is really cheap, and they adapted fabrication methods from the grain silo industry.
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The stainless steel is irrelevant.
They lose 3 raptor engines per crash and that hurts. A lot.
Not sure if they are at v1.0 yet, but "Raptor cost is tracking to well under $1M for V1.0" [0]. Assuming they are, 3 million dollars worth of engines per test isn't that much.
[0]: https://twitter.com/elonmusk/status/1179107539352313856