A THIN CAST STRIP PRODUCT WITH MICROALLOY ADDITIONS, AND METHOD FOR MAKING THE SAME

摘要

Disclosed is an age hardened steel product comprising, carbon, manganese, silicon, and aluminum, at least one element from the group consisting of niobium or vanadium and having a majority of the microstructure comprised of bainite and acicular ferrite and having an increase in elongation and an increase in yield strength after age hardening. Also disclosed is a method of preparing the above steel product comprising: assembling internally a cooled roll caster having laterally positioned casting rolls forming a nip between them, and forming a casting pool of molten steel supported on the casting rolls above the nip and confined adjacent the ends of the casting rolls by side darns, counter rotating the casting rolls to solidify metal shells on the casting rolls as the casting rolls move through the casting pool, and forming steel strip from the metal shells cast downwardly through the nip between the casting rolls, and cooling the steel strip and further age hardening the steel strip at a temperature between 625 degrees Celsius and 800 degrees Celsius.