High-titanium low-nitrogen steel for continuous casting and rolling and preparation method thereof

The invention particularly relates to high-titanium low-nitrogen steel for continuous casting and rolling and a preparation method of the high-titanium low-nitrogen steel, and belongs to the technical field of steel smelting. The desulfurized molten iron is subjected to converter smelting, and converter molten steel is obtained; refining the converter molten steel to obtain casting molten steel; the refining comprises LF refining and VD refining; the casting molten steel is subjected to continuous casting and continuous rolling, and the high-titanium low-nitrogen steel is obtained; the LF + VD duplex process is adopted, all process parameters in the smelting process are controlled, stable control over the high-titanium low-nitrogen steel grade with the titanium content being 0.030%-0.15%, the nitrogen content being smaller than or equal to 30 ppm and the sulfur content being smaller than or equal to 0.0020% in the steel can be achieved, and the requirement for batch production of the high-titanium low-nitroge