Tangganggufen a steel casting and rolling mill technology section in conjunction with the second workshop, on the recent increase of nitrogen in steel has been plagued by technical problems for specific technical research. Increase in the water by taking Tundish covering flux addition and for the protection of the reasonable control of the casting pressure, flow rate of argon gas seal a number of measures to solve the molten steel by the basic nitrogen of technical problems. From the metallographic point of view, mainly of nitrogen in steel aluminum nitrogen compounds, nitrogen compounds in the form of titanium. If excessive nitrogen content in steel can lead to hardening of steel, plastic lower direct impact on the mechanical properties of steel, resulting in steel during deep drawing processing cracks, the occurrence of fracture. Nitrogen in molten steel for the recent increase in the phenomenon occur, Tangganggufen Technology Section, in conjunction with a steel casting and rolling the second workshop, active exploration of nitrogen in liquid steel by the method. First, the increase in Tundish agent dosage, so full of molten steel slag layer in the middle under the orderly flow of molten steel in the air avoid bare; Secondly, after several exploration practice in the argon pressure relief valve installed on the road and the trachea flow meter, the cast for the protection of argon gas seal pressure control in 6kg/cm2, argon gas flow so as to solve the problems of instability; third, rationalize the Ministry of large packet length nozzle bowl shape and improve the hardness of the bowl sealed asbestos so that the bowl and seal the asbestos big bag tightly stuck together long nozzle; Fourth, continuous casting of steel workers poured seal used for argon argon hose and quick connector diligent examination, that the timely replacement of damaged air leakage, give full play to the role of argon gas seal; Fifth, do a better job casting no oxidation protection to prevent the molten steel in the tundish before entering in contact with air, resulting in a second oxidation. Specific measures to go hand in hand through the above, two continuous casting plant has been basically brought under control the phenomenon of increasing nitrogen in molten steel. In recent days, the nitrogen content in carbon steel SS400 are controlled at 50ppm the following; low-carbon steel SPHC, SPHE is controlled by the nitrogen content of 40ppm below, fully meet the technical requirements.