A smelting method for improving the fluidity of molten steel after refining and desulfurization of rebar

Abstract

The invention discloses a smelting method for improving the fluidity of molten steel after refining and desulfurization of rebar. The refining and desulfurization process of rebar comprises: converter smelting - post-furnace and argon station treatment - LF refining - continuous casting. The LF refining process includes: refining and sending The slag-forming material lime is added before electricity, and fluorite is added at the same time to adjust the fluidity of the slag and control the alkalinity of the refining slag to meet the standard requirements. During the power transmission process, diffusion and deoxidation are carried out. After the slag is completely melted, the power is cut off. The desulfurization efficiency meets the standard requirements; particle steel is added to increase the oxygen content in the molten steel, and the fluidity of the molten steel is improved; the components of the molten steel are adjusted to ensure that the components of the molten steel meet the standard requirements, and the temperature is qualified for continuous casting; the technical scheme provided by the present invention , After the sulfur content in the molten steel through the refining process reaches the standard requirements, an appropriate amount of high-quality particle steel of oxidizing material is added to improve the fluidity of the molten steel, avoid the clogging of the pouring nozzle, and make the continuous casting process flow smoothly.

Description

technical field

[0001] The invention relates to the technical field of steel manufacturing, in particular to a smelting method for improving the fluidity of molten steel after refining and desulfurization of rebar. Background technique

[0002] As an important building material, rebar supports the development of the national economy and is widely used in real estate development, self-built houses by rural households, affordable housing and infrastructure construction. Most domestic iron and steel plants use the "converter-argon station-continuous casting" straight-up process to produce rebar, and some iron and steel plants also use the "converter-argon station- LF refining furnace - continuous casting" refining process.

[0003] The main raw materials of converter steelmaking are molten iron and scrap steel. After the blast furnace is suspended for a long time and the furnace condition is poor, the molten iron composition is prone to fluctuation, especially the high sulfur ...

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