Ampco-Pittsburgh Corporation operates in two segments: Forged and Cast Rolls, and Air and Liquid Processing. Forged and Cast Rolls segment is operated by Union Electric Steel Corporation and Union Electric Steel UK Limited. The Air and Liquid Processing segment includes Aerofin, Buffalo Air Handling and Buffalo Pumps, all divisions of Air & Liquid Systems Corporation. Aerofin produces highly-engineered heat-exchange coils for a variety of users, including electric utility, HVAC, power generation, industrial process and other manufacturing industries. Buffalo Air Handling makes custom-designed air handling systems for commercial, institutional and industrial building markets. Union Electric Steel Corporation produces forged hardened steel rolls used in cold rolling by producers of steel, aluminum and other metals throughout the world.