Profile: Cincinnati Steel Treating Co. offers heat-treating services. Our services are used in gear, automotive, machine tool, bearing, heavy equipment, mining, tool & die, industrial knife, foundry and steel fabrication industries. Our aluminum heat treater provides solution treating, aging, stress relieving and annealing of both cast & wrought aluminum. Our flame hardening provides two specialties that are the progressive hardening of rolls and the tooth-to-tooth hardening of large gears & sprockets.