Process to anneal steel strips in an annealing furnace without g

Details Process to anneal steel strips in an annealing furnace without g Process to anneal steel strips in an annealing furnace without g

1995-06-08

1997-07-08

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C21D 176

Patent

active

056456557

ABSTRACT:
A process to anneal a steel strip in an annealing furnace in an inert-gas atmosphere containing hydrogen, with reduced formation of carbon black and encompassing the phases of heating, retention and cooling, wherein on the surface of the steel strip are impurities containing carbon components, and wherein during the annealing, there is a reaction between the H.sub.2 and the carbon components of the impurities on the surface of the steel strip, whereby said reaction changes the composition of the inert gas atmosphere in the annealing furnace from an inert gas containing H.sub.2 into a gas mixture containing H.sub.2 and CH.sub.4, which forms an H.sub.2 --CH.sub.4 system, and wherein the annealing furnace is flushed during the phase of retention, the phase of cooling, or during both the phases of retention and cooling, as a function of at least one of the thermodynamic limit values of the H.sub.2 --C.sub.4 system.

REFERENCES:
patent: 3531333 (1970-09-01), Hill
"Cahiers D'Informations Techniques De La Revue De Metallurgie", vol. 86, No. 2 (1989), pp. 173-180.
"High performance hydrogen annealing technology ", Iron and Steel Engineer, vol. 65, No. (Aug. 1988) pp. 43-49.

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