| abstract |
The invention discloses a smelting method for high-nitrogen and sulfur-containing free-cutting steel, which mainly comprises the following steps: converter smelting and tapping → LF refining furnace → RH vacuum furnace → continuous casting, adding aluminum ingots through the tapping process for pre-deoxidation, and LF refining furnace making For low-basicity slag, add a small amount of aluminum particles to the slag surface to improve the efficiency of diffusion and deoxidation, so that the molten steel can be greatly purified; the RH vacuum furnace is driven by nitrogen, and the ultimate vacuum is maintained for a certain period of time. Four-stage pump, adding nitrogen-containing alloy, and circulating for 5 minutes, which can accurately control the S content and N content in the steel, ensure the precise control of the composition of molten steel in a narrow range, and stabilize the refining cycle at the same time, the operation is simple, and it is suitable for mass production; The method is simple, effective, easy to operate, and can precisely control refining time and refining components, improve molten steel quality, ensure production rhythm, and is suitable for widespread promotion. |