HIGH STRENGTH AND HIGH DUCTILITY STEEL HAVING SUBMICRON SIZED GRAIN AND THE FABRICATION METHOD THEREOF

PURPOSE: A steel of high intensity and high ductility and manufacturing method are provided to reduce the production cost by applying SIMRT process. CONSTITUTION: A method for manufacturing a steel of high intensity and high ductility with ultra fine grain comprises: a step of processing metastable...

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Bibliographische Detailangaben
Hauptverfasser:	YU, CHAN SU, PARK, YONG MIN, LEE, YOUNG GUK
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PURPOSE: A steel of high intensity and high ductility and manufacturing method are provided to reduce the production cost by applying SIMRT process. CONSTITUTION: A method for manufacturing a steel of high intensity and high ductility with ultra fine grain comprises: a step of processing metastable qustenite steel over 40% of reduction ratio; a step of forming strain induced martensite; and a step of heating in the temperature range of martensite/austenite inverse transformation ending temperature. The metastable is Ni(7-11 weight%), Cr(8-2 weight%), Mn(2-10 weight%), remaining Fe and other impurities.