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In business since 1952 and celebrating our 70th year anniversary this year, Circle City Heat Treating, Inc. is known for its outstanding quality and extraordinary customer service and day-in and day-out reliability and turnaround. With over 55 furnaces and ovens, Circle City Heat Treating, Inc. provides heat treating (steel and aluminum) , black oxide and cryogenic processing services to customers in the automotive, aerospace, defense, medical, motorsports, agricultural, semi conductor and electronics, tool & die, general manufacturing, etc.