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aluminium is just as strong.
Regardless of the grade of ali?
Just that I’ve dealt with several many seized and sheared ali chainring bolts but all that seems to go wrong with steel ones is rounding the allen wrench fitting. And I suppose occasionally they do get a bit rusty.
TLDR: I’ve had more hassle from aluminium than steel in this application so my anecdata says steel is better.
M_V
Netakure
gbj_tester
Manufacturers don't usually specify a high strength steel for chainring nuts, but they make their tarty chainrings from 7075T6. If the steel fasteners aren't at least grade 8.8 (and they probably aren't) then the aluminium is just as strong.