Smelting method capable of improving fluidity of molten steel after refining and desulfurizing of deformed steel bar

Abstract

The invention discloses a smelting method capable of improving fluidity of molten steel after refining and desulfurizing of a deformed steel bar. A deformed steel bar refining and desulfurizing process comprises the steps of converter smelting, post-furnace and argon station treatment, LF refining and continuous casting; and an LF refining process comprises the steps of: adding slag making material lime before refining and power transmission, and adding fluorite at the same time to adjust slag fluidity; controlling the alkalinity of refining slag to meet the standard requirement; carrying out diffusion deoxidation in the power transmission process, cutting off power after the slag is completely molten, expanding a steel ladle for bottom blowing argon, and controlling the desulfurization efficiency to meet the standard requirement; adding particle steel to increase the oxygen content in the molten steel and improve the fluidity of the molten steel; and adjusting the components of the molten steel to ensure that the components of the molten steel meet the standard requirement, and continuously casting on a crane ladle after the temperature is qualified. According to the technical scheme provided by the invention, after the sulfur content in the molten steel in the refining process reaches the standard requirement, a proper amount of oxidizing material high-quality particle steel is added, so that the fluidity of the molten steel is improved, a pouring nozzle is prevented from being blocked, and pouring in the continuous casting process is smooth.

Description

technical field

[0001] The invention relates to the technical field of steel manufacture, in particular to a smelting method for improving the fluidity of molten steel after smelting and desulfurization of threaded steel. 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 for rural farmers, 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 "converter-argon station- LF refining furnace - continuous casting" refining process.

[0003] The main raw materials for converter steelmaking are molten iron and steel scrap. After a long-time shutdown of the blast furnace or when the furnace is in poor condition, the composition of the molten iron is prone to fluctuations, especially the ...

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