Method for increasing endpoint carbon content of converter

Abstract

The invention discloses a method for increasing the endpoint carbon content of the converter. The method comprises the following steps: adding steel scraps in the molten iron of a converter, then adding slag while controlling the initial basicity of slag to 2.5-3 and controlling the heating speed of the process; supplying oxygen, converting to control the phosphorus content of molten iron to lessthan 0.025%; and performing catch carbon while controlling the catch carbon temperature to 1620-1660 DEG C, controlling the carbon content of molten iron to 0.2%-0.4% and controlling the adding time of all the auxiliary materials to be less than 3min, wherein when a dephosphorization oxygen lance is used to supply oxygen, and the dephosphorization oxygen lance is 1.2m-1.6m above the liquid level of a molten bath in the converter during the preset time before catch carbon. The method of the invention adopts an compact production organization model, thus the number of reblowings can be reduced and the heat of the converter can be effectively utilized.

Description

The method of increasing the carbon content at the end point of converter technical field The invention relates to the field of steelmaking, in particular to the end point control of converter steelmaking, that is, a method for increasing the carbon content at the end point of the converter. Background technique Steelmaking end point control is an important operation at the end of converter blowing, because phosphorus and sulfur are always removed to the range required by the end point as far as possible in advance during the blowing process. Compared with molten steel temperature control, converter end point carbon control is particularly important. Important and difficult, it will affect the operation of the entire converter smelting process, so the main content of the converter's end point control is end point carbon control and molten steel temperature control. At present, oxygen converters often use "high carbon" operation to smelt high carbon steel. The so-called "...

AI Technical Summary

Problems solved by technology

However, the content of [O] in molten steel obtained by high-strength supplementary blowing method is relatively high, which has a great impact on the quality of molten steel, and the elimination cost is also high

Therefore, the current end-point control methods for converter steelmaking cannot effectively control the carbon content and the content of other components at the end point, so it is urgent to improve the existing converter end point [C] control method to improve the end point of the converter. [C] content

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