Nitrogen-containing steel and smelting method thereof

The invention discloses nitrogen-containing steel and a smelting method thereof, and belongs to the technical field of nitrogen-containing steel smelting. The preparation method of the nitrogen-containing steel comprises the following steps that a molten iron raw material is subjected to a KR procedure, silicon manganese nitride is added, stirring is conducted, then converter smelting is conducted on the molten iron raw material and converter slag, oxygen is blown from the top, inert gas is blown from the bottom, and nitrogen is blown from the top after oxygen blowing is stopped; the oxygen content of converter molten steel obtained at the end point of converter smelting is 0.07-0.10 wt%, the carbon content is smaller than or equal to 0.06 wt%, the nitrogen content is 0.008-0.0100 wt%, the temperature is 1620-1640 DEG C, and the nitrogen-containing steel is obtained through LF furnace refining and continuous casting. According to the method, powdery silicon-manganese nitride is added in the KR process, the mo