Midwest Thermal-Vac. Inc. Is North Americas premier Vacuum Processing Heat Treater. Specializing in Vacuum Carburizing, Vacuum Carbonitriding, with both Vacuum oil quench and HPGQ up to 23 bar. We also provide Vacuum processing for tool steels, stainless steels, and hot work steels. We have added another new Pulse-Plasma Ion Nitider System for our customers lead times.