I couldn't find my Record OR crank for some reason, but in my search I did come across this Centaur MTB crank. The middle and inner rings are steel. I have a few other Campy MTB cranks and all of those have alloy middle and inner rings.







As for Record OR, it also came with steel middle and inner rings. That's not surprising considering that they mounted in a very different manner than a typical chainring. This pic was "borrowed" from the web.