High efficiency reduction carburization

Details High efficiency reduction carburization High efficiency reduction carburization

B - Operations, Transporting

22

F

75/157

B22F 3/12 (2006.01) B22F 3/10 (2006.01) B22F 3/24 (2006.01) C22C 33/02 (2006.01) C23C 8/22 (2006.01)

Patent

CA 1225536

ABSTRACT The invention involves a method for making powder metal forging preforms of high strength ferrous- base alloys in which the times and temperatures for reducing oxides, sintering, and carburizing are substan- tially reduced as compared to conventional techniques. The method includes simultaneously sintering and carbur- izing the preforms in the hot zone of a sintering furnace at temperatures below 1093°C. (2000°F.) and for a period of time above austenitic temperature not exceeding about 35 minutes. After carburizing the preforms are rapidly cooled to freeze the case carbon gradient obtained in the hot zone.

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