Dephosphorization control method for unequal samples at converter smelting end points of DC04 steel

Abstract

The invention discloses a dephosphorization control method for unequal samples at converter smelting end point of DC04 steel, and belongs to the technical field of converter steelmaking. The method comprises the following steps that on the basis of the optimal slag remaining amount and the slag alkalinity, the molten steel temperature obtained through sublance TSC measurement is t DEG C, the carbon content in molten steel is c%, when t + c * 100-1650 is smaller than or equal to 0, sintering ore is not added in the follow-up auxiliary blowing process, and when t + c * 100-1650 is larger than 0, a certain amount of sintering ore is added in the follow-up auxiliary blowing process; and during sublance TSO measurement, the measured molten steel temperature meets the tapping requirement, and when the measured end point oxygen content of molten steel is larger than or equal to X / 0.0315-55, unequal samples are obtained, wherein X is the average carbon oxygen deposit of first 3 furnaces. When X is smaller than 13, X is 13, when X is larger than 16, X is 16, and when X is larger than or equal to 13 and smaller than or equal to 16, X is the original value. In order to solve the problems in the prior art, it is necessary to research the dephosphorization control method for unequal samples at the converter smelting end point of the DC04 steel, the phosphorus content at the end point of molten steel can be effectively controlled, the qualification rate of the phosphorus content of the molten steel is guaranteed, and tapping can be achieved through unequal samples.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and more specifically relates to a dephosphorization control method with different end points of DC04 steel converter smelting. Background technique [0002] With the maturity of the converter steelmaking process, the requirements for the dephosphorization control level of the converter are constantly increasing. Generally, the steel is tapped after the blowing end point and other samples are qualified, which can no longer adapt to the development trend of efficient production of the converter and shortening the smelting cycle. When the converter produces low-phosphorus IF steel DC04 (the phosphorus content requirement for internal control is ≤0.015%, and the phosphorus content requirement for judgment steel is ≤0.020%). And its oxidation is at the peak of the steelmaking process, which is extremely harmful to the furnace condition. At the same time, due to the long waiting time a...

AI Technical Summary

Problems solved by technology

Generally, the steel is tapped after the blowing end point and other samples are qualified, which can no longer adapt to the development trend of efficient production of the converter and shortening the smelting cycle.

When the converter produces low-phosphorus IF steel DC04 (the phosphorus content requirement for internal control is ≤0.015%, and the phosphorus content requirement for judgment steel is ≤0.020%). and its oxidative properties are at the peak of the steelmaking process, which is extremely harmful to the furnace condition

At the same time, due to the long waiting time at the end of blowing, the temperature drops during the waiting process, and the heat is lost, which increases the energy consumption of the steelmaking process.

However, if the end point is not equal, it is difficult to control the phosphorus content at the end point of the converter.