| abstract |
Average particle having less than 0.4 wt% carbon, less than 0.06 wt% aluminum, less than 0.01 wt% titanium, less than 0.01 wt% niobium, less than 0.02 wt% vanadium A steel material having a high austenite grain roughening temperature, having fine oxide particles comprising silicon and iron distributed in a steel microstructure that may be less than 50 nanometers in size and 5-30 nanometers. The steel can have fine oxide particles distributed in the microstructure that can limit ferrite recrystallization at strain levels up to at least 10.0% at temperatures up to 750 ° C. and residence times up to 20 minutes. Introduced between the casting rolls to form a cast pool of molten carbon steel having a total oxygen content of at least 70 ppm, usually less than 250 ppm, and a free oxygen content of 20-60 ppm, and continuously rolling the steel strip by rotating the casting rolls toward each other By doing so, steel can be made. |