Smelting method of low-carbon and high-manganese steel

The invention discloses a smelting method of low-carbon and high-manganese steel. Desulfurated molten iron is added into a converter, the end point carbon content is controlled to be 0.03-0.05%, the oxygen value of tapped steel is 400-500 ppm, and the temperature is controlled to be 1660-1680 DEG C; the temperature when molten steel enters an RH furnace is larger than 1610 DEG C, and decarburization is carried out till the carbon content is below 0.01%; the molten steel processed by the RH furnace is added into the converter, and before the molten steel is added, a mixture of manganese metal and aluminum metal is added into the converter so that alloying of manganese can be conducted; after the molten steel is added, the converter is rocked, a burning torch is put and ignited, steel is discharged after alloy in the converter is wholly molten, and the temperature is controlled to be 1600 DEG C or over; and after the steel enters an LF, if the temperature is lower than 1530 DEG C, the temperature is increased to be over 1530 DEG C firstly, and then alloying of manganese can be carried out, and the temperature when the steel is carried out of the LF is larger than 1500 DEG C. By means of the smelting method, the final manganese content in steel can be controlled to be 15-20% stably, the carbon content is controlled to be below 0.05%, and the problem that the low-carbon and high-manganese steel cannot be produced through conventional converters or refining is solved.