A method for manufacturing a high strength formable continuously annealed steel strip

The present invention relates to a method for manufacturing high strength formable steel, to a high strength formable continuously annealed steel strip product and to a steel coil. Especially the present invention relates to those steel strips, which utilize microalloying based strengthening instead...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Lyytinen, Oskari, Kopio, Tero, Peura, Pasi
Format:	Patent
Sprache:	eng ; fre ; ger
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 LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The present invention relates to a method for manufacturing high strength formable steel, to a high strength formable continuously annealed steel strip product and to a steel coil. Especially the present invention relates to those steel strips, which utilize microalloying based strengthening instead of substantial phase hardening. The present invention is based on the idea of direct quenching the microalloyed hot-rolled steel strip after the last hot-rolling pass of the hot-rolling step to a temperature below 400 °C and subjecting such quenched steel strip to a continuous annealing at a temperature between 400 and 900 °C. This way at least part of, preferably at least most of the microalloying elements stay uniformly in the solution during the manufacturing of hot-rolled strip and they include precipitation potential for the following process step(s). Due to the present invention, the produced steel strip is extremely well formable taking into account the strength level.