It’s very easy to tell if a 100% polished out crank is cast or steel.
Drill a shallow 3/16” hole in the the flywheel end of the crank as close as you can get it to the crank centerline.
If the crank is cast you’ll drill out chips, if it’s steel you’ll get long shards.
My bet is since you say it has a center square cheek that it’s a factor nodular iron crank.
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