Method and device for reaction control
AssigneeCockerill Maintenance & Ingenierie S.A.
InventorMichel Dubois
Life of this patent
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Abstract
A method for controlling surface reactions on a steel strip running through a furnace includes, successively, a first section, a second section, and a third section separated by a sealing element, an atmosphere in the second and third sections being oxidizing and reducing respectively, the method including: heating, in the first section, the steel strip to between 600 and 750° C., while causing the atmosphere therein to be slightly oxidizing and to include: an H2 content inferior to 2%; an O2 content inferior to 0.1%; an H2O or CO2, or H2O+CO2 content superior to 0.03%; a controlled dew point ranging from −50 to −15° C.; and a controlled concentration of CO+CO2 maintained below 2%. All percentages are expressed in terms of volume.
Claims17
A method for controlling surface reactions on a steel strip running through a furnace comprising, successively, a first section, a second section, and a third section separated by a sealing element, an atmosphere in the second and third sections being oxidizing and reducing respectively, the method comprising:
- heating, in the first section, the steel strip to between 600 and 750° C., the first section comprising a resistance heater, an inductive heater, or a radiant tube heater, while causing the atmosphere therein to be slightly oxidizing and to include:
- an H2 content inferior to 2%;
- an O2 content inferior to 0.1%;
- an H2O or CO2, or H2O+CO2 content superior to 0.03%;
- a controlled dew point ranging from −50 to −15° C.;
- and
- a controlled concentration of CO+CO2 maintained below 2%,
- wherein all percentages are expressed in terms of volume;
- and
- wherein the atmosphere in the second section comprises a concentration of oxygen of between 0.1 and 5% by volume.
Dependencies are inferred from the claim text.