The invention discloses a
smelting method of high-
nitrogen sulfur-containing free-
cutting steel. The
smelting method mainly comprises the following steps of converter
smelting tapping, LF refining furnace treatment, RH
vacuum furnace treatment and
continuous casting; an aluminum
ingot is added in the tapping process for pre-deoxidation, low-
alkalinity slag is made by an LF refining furnace, a small amount of aluminum particles are added in the
slag surface, the
diffusion deoxidation efficiency is improved, and
molten steel is greatly purified; and an RH
vacuum furnace adopts
nitrogen drive, limit vacuum is kept for a certain time, a first-stage pump is retreated to a fourth-stage pump after vacuum breaking, a
nitrogen-containing
alloy is added, and circulation is conducted for 5 min, so that the S content and the N content in the steel can be accurately controlled, narrow-range accurate control over
molten steel components is guaranteed, meanwhile, the refining period is stabilized, operation is easy, and the method is suitable for
mass production. The method is simple, effective, easy to operate, capable of accurately controlling refining time and refining components, improving
molten steel quality and guaranteeing the production
rhythm and suitable for wide popularization.