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

A converter smelting and control method technology, which is applied in the field of converter steelmaking, can solve the problems of heat loss, shortening smelting cycle, temperature reduction, etc., and achieves the advantages of reducing refractory material and energy consumption, increasing the oxidizing atmosphere in the furnace, and improving the production operation rate. Effect

Active Publication Date: 2021-12-03
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of dephosphorization control method of DC04 steel converter smelting end point of the present embodiment is not equal, comprising the following steps:

[0023] S1: On the basis of the optimal amount of slag remaining and slag basicity, the optimum amount of slag remaining for smelting DC04 steel in a 300-ton converter is 17 to 24 tons and the slag basicity is 4.3-4.7. If the amount of slag remaining is too low, it will affect the The dephosphorization effect makes the phosphorus content of the molten steel at the end point higher; while the amount of slag left is too high, the slag layer will be too thick, and the temperature rise in the auxiliary blowing process will be slow, which will affect the temperature of the molten steel at the end point, resulting in insufficient temperature of the molten steel at the end point. If the slag alkalinity is too low, it is not conducive to the dephosphorization reaction; if the slag alkalinity is too high, the fluidity of th...

Embodiment 2

[0031] The dephosphorization control method of a DC04 steel converter with different smelting end points in this embodiment is basically the same as in Example 1, the difference is that in this embodiment, the 300-ton converter has confirmed that the bottom blowing condition of the converter is good, and the converter is continuous. For production, the average carbon and oxygen product of the first three furnaces is calculated to be 14.3. After the steel is tapped from the previous furnace, the amount of slag remaining after slag turning is controlled at 24 tons. The furnace is protected by slag splashing. The slag alkalinity is set to 4.7, and the static model is calculated. 38.7 tons of scrap steel, 294.2 tons of molten iron, of which the molten iron includes the following chemical components in mass percentages: C: 4.57%, Si: 0.60%, Mn: 0.18%, P: 0.141%, S: 0.002%, V: 0.064%, Ti : 0.123%, the rest is Fe and other impurities. The temperature of molten iron after KR treatment...

Embodiment 3

[0034] The dephosphorization control method of a DC04 steel converter with different smelting end points in this embodiment is basically the same as in Embodiment 1, the difference is that in this embodiment, the 300-ton converter in this embodiment confirms the converter bottom blowing condition Good, the converter is in continuous production, the average carbon and oxygen product of the first 3 furnaces is calculated as 13.6, the steel is tapped from the previous furnace, the amount of slag left after slag turning is controlled at 20 tons, the furnace is protected by slag splashing, the slag basicity is set to 4.5, and static Model calculations add 25.5 tons of steel scrap and 294.2 tons of molten iron, where the molten iron includes the following chemical components in mass percentages: C: 4.59%, Si: 0.39%, Mn: 0.16%, P: 0.141%, S: 0.001%, V: 0.055%, Ti: 0.058%, and the rest are Fe and other impurities. After the molten iron is KR treated, the temperature is 1273°C, and sme...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/35C21C7/064C21C5/46
CPCC21C5/28C21C5/35C21C7/064C21C5/4673Y02P10/25
Inventor 邱在军邓勇吴亚男韩宝谢大为张小林杜克斌许辉
Owner MAANSHAN IRON & STEEL CO LTD
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