Please note that the steel collector does NOT mine steel ore.
How To Obtain:
Steel Collector can be brought from Auctions, it can also be earned from the Atom Fusion.
Megabot + Aircraft III (Confirmed, I just got mine)
Megabot + Eradicator
Megabot + Two-Headed Dragon Drone
Evil Hannibal + Roller Skater (i Just got mine, too )
Alien Instigator + Machine Jeep II
Viking Core Bot + Viking Motosquad (just got mine as well)