PROCESS FOR MANUFACTURING A GALVANIZED OR A GALVANNEALED STEEL SHEET BY DFF REGULATION

The invention deals with a process for manufacturing a hot-dip galvanized or galvannealed steel sheet having a TRIP microstructure, said process comprising the steps consisting in: - providing a steel sheet whose composition comprises, by weight: 0.01 ¤ C ¤ 0.22%, 0.50 ¤ Mn ¤ 2.0%, 0.2 ¤ Si ¤...

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Bibliographische Detailangaben
Hauptverfasser:	SAINT-RAYMOND, HUBERT, HUIN, DIDIER, BERTRAND, FLORENCE
Format:	Patent
Sprache:	eng ; pol
Schlagworte:	ALLOYS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The invention deals with a process for manufacturing a hot-dip galvanized or galvannealed steel sheet having a TRIP microstructure, said process comprising the steps consisting in: - providing a steel sheet whose composition comprises, by weight: 0.01 ¤ C ¤ 0.22%, 0.50 ¤ Mn ¤ 2.0%, 0.2 ¤ Si ¤ 2.0%, 0.005 ¤ Al ¤ 2.0%, Mo < 1.0%, Cr ¤ 1.0%, P < 0.02%, Ti ¤ 0.20%, V ¤ 0.40%, Ni ¤ 1.0%, Nb ¤ 0.20%, the balance of the composition being iron and unavoidable impurities resulting from the smelting, - oxidizing said steel sheet in a direct flame furnace where the atmosphere comprises air and fuel with an air-to-fuel ratio between 0.80 and 0.95, so that a layer of iron oxide having a thickness from 0,05 to 0,2 µm is formed on the surface of the steel sheet, and an internal oxide of Si and/or Mn and/or Al is formed, - reducing said oxidized steel sheet in order to achieve a reduction of the layer of iron oxide, - hot-dip galvanising said reduced steel sheet to form a zinc-coated steel sheet, and - optionally, subjecting said hot-dip coated steel sheet to an alloying treatment to form a galvannealed steel sheet.