Atmospheres for decarburize annealing steels

Details Atmospheres for decarburize annealing steels Atmospheres for decarburize annealing steels

C - Chemistry, Metallurgy

21

D

C21D 1/76 (2006.01) C21D 3/04 (2006.01)

Patent

CA 2141770

A process for producing low-cost atmospheres suitable for decarburize annealing carbon steels from non-cryogenically generated nitrogen containing up to 1.5% residual oxygen by catalytically deoxygenationg a non-cryogenically generated nitrogen stream at low temperatures with a hydrocarbon gas and mixing the deoxygenated stream with an economical amount of hydrogen prior to introduction into the furnace for annealing. The process includes the use of 1) hydrocarbon gas to convert residual oxygen to a mixture of carbon dioxide and moisture at low temperatures and 2) mixing the deoxygenated stream with a sufficient amount of hydrogen to maintain a pH2/pH2O ratio of at least 2 in the furnace.

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