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I can't find a link to "SX500 alloy" in searches, so here's a bookholder for now. First mentioned here: SX 300 & soon SX 500. Kind of a modern version of Inconel superalloys. High strength at temperature, extreme oxidation resistance. Needed for ~800 atmosphere, hot, oxygen-rich turbopump on Raptor rocket engine. (Tweet by Elon Musk 2018-06-17T09:25-07) Well, that's why: I needed to search for "SX 500 alloy", which I did find in Google.