Atmospheres for decarburize annealing steels

Details Atmospheres for decarburize annealing steels Atmospheres for decarburize annealing steels

1994-02-10

1995-03-28

Dean, Richard O.

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

148208, 148633, 148655, 148660, 148278, 148287, 423219, C21D 176

Patent

active

054013399

ABSTRACT:
A process for producing low-cost atmospheres suitable for decarburize annealing carbon steels from non-cryogenically generated nitrogen containing up to 1.54 residual oxygen by catalytically deoxygenating 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 pH.sub.2 /pH.sub.2 O ratio of at least 2 in the furnace.

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