A kind of method for adjusting carbon by LF refining for carbon steel

Abstract

The invention relates to the technical field of iron and steel metallurgy, in particular to an LF refining carbon adjustment method for carbon steel. It specifically includes the following process steps: 1) Determine whether to implement carbon adjustment operation according to the composition of molten steel entering the furnace; 2) If the carbon content in the furnace is lower than the lower limit of the finished product by 0.01% to 0.03%, the amount of carburant added is 0.2 to 0.4kg / t; if the carbon content of the furnace is lower than the lower limit of the finished product by 0.03% to 0.06%, the amount of carburizer added is 0.45 to 0.75kg / t. 3) Add a specified amount of carburant according to the carbon content of the first sample into the furnace , turn on the argon gas; stir for 20 to 40 seconds to ensure that the added carburant is covered by slag, turn down the argon gas, heat the electrode with slag submerged arc, and use the heat generated by the electrode arc to melt the carburant; 4) Determine the heating time for refining and carburizing according to the data of the added carburant: 5) After the operation of heating and melting the carburant, stop heating and turn on the argon gas. Reduce the heating time of LF furnace, reduce the consumption of argon, reduce the energy consumption;

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an LF refining carbon adjustment method for carbon steel. Background technique [0002] The LF furnace smelting replaces the reduction refining period of the electric arc furnace, thereby reducing the refining burden of the electric arc furnace and improving the productivity of the electric arc furnace. In the early stage of LF furnace development, it was only used to produce high-grade steel. With the development of metallurgy, continuous casting and related control technologies, the scope of application of LF furnace has been expanded. Because the LF furnace has the advantages of less investment, wide application, and good refining effect, in recent years, the LF furnace has been used as the main means of refining outside the furnace at home and abroad in recent years. [0003] However, the LF refining process has the following disadvantages: the composition ...

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Problems solved by technology

[0003] However, the LF refining process has the following disadvantages: the composition adjustment and deoxidation and desulfurization operations in the LF furnace refining require strong argon stirring. On the one hand, the large temperature drop caused by a large amount of argon stirring requires LF furnace heating for temperature compensation. On the other hand, when a large amount of argon is stirred, it will cause the surface of the molten steel to be exposed and increase the amount of nitrogen absorption, resulting in the inhomogeneity of the composition of the molten steel, which increases the difficulty of precise control of the composition.

At the same time, a large amount of argon gas stirring will also increase the splashing of steel slag, resulting in serious slag hanging on the furnace cover and ladle car