CN113528739A - Method for calculating converter smelting end-point slag-steel phosphorus distribution ratio - Google Patents

Method for calculating converter smelting end-point slag-steel phosphorus distribution ratio Download PDF

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CN113528739A
CN113528739A CN202110579460.4A CN202110579460A CN113528739A CN 113528739 A CN113528739 A CN 113528739A CN 202110579460 A CN202110579460 A CN 202110579460A CN 113528739 A CN113528739 A CN 113528739A
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slag
smelting
steel
converter
end point
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马德刚
王耐
李波
李建英
李经哲
王建兴
武冠华
孙宏亮
王言峰
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Tangshan Steel Group High Strength Automobile Plate Co ltd
Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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Tangshan Steel Group High Strength Automobile Plate Co ltd
Tangshan Iron and Steel Group Co Ltd
HBIS Co Ltd Tangshan Branch
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2300/00—Process aspects
    • C21C2300/06—Modeling of the process, e.g. for control purposes; CII
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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Abstract

The invention relates to a method for calculating the distribution ratio of converter smelting end-point slag to steel phosphorus, which comprises the steps of carrying out standing treatment on molten steel and slag after the converter blowing is finished, wherein the standing time is more than or equal to 140s, and carrying out the distribution ratio of the converter smelting end-point slag to the steel phosphorus after the standing is finished
Figure 100004_DEST_PATH_IMAGE002
The smelting end points T, (% MgO) and (% CaO) correspond to the following formula 1: lg
Figure 407875DEST_PATH_IMAGE002
=

Description

Method for calculating converter smelting end-point slag-steel phosphorus distribution ratio
Technical Field
The invention belongs to the technical field of converter steelmaking in the metallurgical industry, and particularly relates to a method for calculating a converter smelting end-point slag-steel phosphorus distribution ratio.
Background
IF steel is used as deep drawing steel, the requirement on phosphorus content is strict, and the requirement on the phosphorus content of a finished product is less than or equal to 0.013%. The IF steel is smelted by a 100-ton medium-small converter, the requirement on the end point temperature is high, and the difficulty in smelting low-phosphorus steel is high. The slag-steel phosphorus distribution ratio is an important parameter of dephosphorization reaction capability among slag steels, has close relation with molten steel components, slag components, temperature and the like, and is usually a slag-steel phosphorus distribution ratio calculation model under a balanced state reported in documents. In the later stage of actual converter blowing, a certain amount of carbon exists in a molten pool, after blowing is finished, the carbon in the molten pool reacts with oxygen to be close to balance after standing for 140s, but the slag is always in a peroxide state, namely the oxygen potential of the slag is higher than that of molten steel and is in a non-equilibrium state. Therefore, a slag-steel phosphorus distribution ratio forecasting model which accords with the actual smelting is constructed, and the method has important guiding significance for improving the hit ratio of the primary carbon drawing dephosphorization.
Disclosure of Invention
The invention solves the technical problem that the invention provides a method for calculating the distribution ratio of the smelting end point slag of the converter to the steel phosphorus, which comprehensively considers the influence of the temperature T of the smelting end point molten steel, the mass percent content C of carbon in the smelting end point molten steel, the mass percent content of MgO in the smelting end point slag (% MgO), the mass percent content of CaO in the smelting end point slag (% CaO) and other factors on the distribution ratio of the phosphorus, and realizes the accurate prediction of the distribution ratio of the smelting end point slag of the converter to the steel phosphorus.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for calculating the distribution ratio of end-point slag to steel phosphorus in converter smelting includes such steps as blowing in converter, laying aside the molten steel and slag for more than 140s, and laying aside for the end-point slag to steel phosphorus
Figure BDA0003085638570000021
The smelting end points T, (% MgO) and (% CaO) correspond to the following formula 1:
Figure BDA0003085638570000022
wherein T is the temperature of the molten steel at the smelting end point, the (% MgO) is the MgO mass percentage content in the slag at the smelting end point, and the (% CaO) is the CaO mass percentage content in the slag at the smelting end point;
t is more than or equal to 1680 ℃, the mass percent of carbon in the molten steel at the smelting end point is 0.02-0.045%, the mass percent of phosphorus in the molten steel at the smelting end point is less than or equal to 0.012%, the mass percent of MgO in the slag at the smelting end point is 7.6-9.5%, the sum of the mass percent of MgO and CaO in the slag at the smelting end point (% MgO) + (% CaO) is 50-60%, a is 0.2-0.4, and b is 1.387-1.523.
Further, the mass percentage of carbon in the b and the smelting end point molten steel [% C ] is in accordance with the following formula 2:
Figure BDA0003085638570000023
and the value of d is 8335-8345.
Further, the converter smelting process is single slag smelting.
Further, the converter performs bottom blowing during the standing process.
The smelting end point of the invention is when the standing is finished.
The parameter b in the formula 1 of the invention is a parameter related to the oxidizing property of the slag.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the accurate calculation of the end-point slag-steel phosphorus distribution ratio in the IF steel smelting process by the 100-ton combined blown converter is realized, and the method has good popularization and application values in the IF steel smelting process by the 100-ton combined blown converter.
In addition, the method can be used for predicting the distribution ratio of the smelting end point slag to the steel phosphorus, and the distribution ratio of the smelting end point slag to the steel phosphorus is predicted by predicting T, [% C ], [% P ], (% MgO) and(% CaO) of the smelting end point and calculating by a formula.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples 1 to 6
The IF steel is smelted by a 100-ton combined blown converter by adopting conventional single slag smelting, a molten iron and scrap steel mode is adopted, the molten iron ratio is more than 86%, the phosphorus content of the charged molten iron is less than or equal to 0.13%, and the silicon content of the charged molten iron is as follows: 0.3 to 0.6 percent; the smelting gun positions are double high and double low gun positions, and the oxygen lance nozzle is a 4-hole nozzle; converter bottom blowing adopts a mode of 12 bottom blowing guns surrounding distribution, the diameter of the bottom blowing gun is 22mm, and the bottom blowing working pressure is more than or equal to 0.4 MPa; and (3) carrying out primary carbon drawing, blowing argon at the bottom after the converter blowing is finished, standing the molten steel and the slag, and then pouring the converter to measure the temperature and take a sample.
Examples 1 to 5
Calculating the distribution ratio of the converter smelting end-point slag to the steel phosphorus by adopting the formulas 1 and 2
Figure BDA0003085638570000031
Figure BDA0003085638570000032
Figure BDA0003085638570000033
The standing time of the molten steel is shown in Table 1, and T and [% C in the formula is based on the smelting end point after the molten steel is completely stood]、[％P]The values of the parameters a, (% MgO), CaO and a are shown in Table 1, and the parameter b obtained by calculation according to the formula 2 is shown in Table 2. B calculated by formula 2, b calculated by formula 1
Figure BDA0003085638570000034
Also shown in Table 2. The phosphorus content (% P) in slag and the phosphorus content [% P) in steel were actually measured]Actual result of calculation
Figure BDA0003085638570000041
Are shown in Table 2.
TABLE 1
Figure BDA0003085638570000042
TABLE 2
Figure BDA0003085638570000043
Figure BDA0003085638570000051
Example 6
First, predicting T, [% C of smelting end point]、[％P]And the percentage MgO and the percentage CaO are calculated according to the formulas 1 and 2, and the slag-steel phosphorus distribution ratio at the smelting end point is predicted. End point of smelting T, [% C]、[％P]Predicted and actual values for [% C using predicted values for [% MgO), (% CaO) are listed in Table 3]Obtained by the formula 2, and the calculated slag-steel phosphorus distribution ratio
Figure BDA0003085638570000052
And the actual slag-steel phosphorus distribution ratio
Figure BDA0003085638570000053
Also shown in Table 3.
TABLE 3
Figure BDA0003085638570000054
Through multiple tests, the T and [% C at the smelting end point]、[％P]Predicted values T of (% MgO) and (% CaO)Prediction、[％C]Prediction、[％P]Prediction、(％MgO)Prediction、(％CaO)PredictionWith the actual value TPractice of、[％C]Practice of、[％P]Practice of、(％MgO)Practice of、(％CaO)Practice ofWhile satisfying the following conditions, when the following conditions are satisfied,
Figure BDA0003085638570000055
the calculation result can be well matched with the actual value:
∣Tprediction－TPractice of∣≤5℃，∣[％C]Prediction－[％C]Practice of∣≤0.005％，[％P]≤0.012％，∣(％MgO)Prediction－(％MgO)Practice of∣≤1％，∣(％CaO)Prediction－(％CaO)Practice of∣≤1％。
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (4)

1. A method for calculating the distribution ratio of the smelting end-point slag to the steel phosphorus in a converter is characterized in that after the blowing of the converter is finished, the molten steel and the slag are subjected to standing treatment for more than or equal to 140s, and after the standing treatment is finished, the distribution ratio of the smelting end-point slag to the steel phosphorus in the converter is calculated
Figure DEST_PATH_IMAGE002
The smelting end points T, (% MgO) and (% CaO) correspond to the following formula 1:
lg
Figure 580914DEST_PATH_IMAGE002
=
Figure DEST_PATH_IMAGE004
-9.78+0.71×{(%CaO)+a×(%MgO)}＋b （1）
wherein T is the temperature of the molten steel at the smelting end point, the (% MgO) is the MgO mass percentage content in the slag at the smelting end point, and the (% CaO) is the CaO mass percentage content in the slag at the smelting end point;
t is more than or equal to 1680 ℃, the mass percent of carbon in the molten steel at the smelting end point is 0.02-0.045%, the mass percent of phosphorus in the molten steel at the smelting end point is less than or equal to 0.012%, the mass percent of MgO in the slag at the smelting end point is 7.6-9.5%, the sum of the mass percent of MgO and CaO in the slag at the smelting end point (% MgO) + (% CaO) is 50-60%, a is 0.2-0.4, and b is 1.387-1.523.
2. The method for calculating the distribution ratio of the converter smelting end point slag to the steel phosphorus according to claim 1, wherein the mass percentage of carbon [% C ] in the b molten steel and the smelting end point molten steel conforms to the following formula 2:
b＝lg(
Figure DEST_PATH_IMAGE006
d×
Figure DEST_PATH_IMAGE008
+259049.84068)+2.5lg
Figure DEST_PATH_IMAGE010
（2）
and the value of d is 8335-8345.
3. The method for calculating the slag-steel phosphorus distribution ratio at the smelting end point of the converter according to any one of claims 1 or 2, wherein the smelting process of the converter is single slag smelting.
4. The method for calculating the distribution ratio of slag to phosphorus in steel at the end of converter smelting according to any one of claims 1 or 2, wherein the converter performs bottom blowing during the standing process.
CN202110579460.4A 2021-05-26 2021-05-26 Method for calculating converter smelting end-point slag-steel phosphorus distribution ratio Withdrawn CN113528739A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5868817A (en) * 1994-06-30 1999-02-09 Nippon Steel Corporation Process for producing steel by converter
CN108676957A (en) * 2018-06-27 2018-10-19 攀钢集团攀枝花钢铁研究院有限公司 Cold conditions slag renewable resources semi-steel making technique
CN110551867A (en) * 2018-06-01 2019-12-10 上海梅山钢铁股份有限公司 Converter smelting control method based on slag component prediction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5868817A (en) * 1994-06-30 1999-02-09 Nippon Steel Corporation Process for producing steel by converter
CN110551867A (en) * 2018-06-01 2019-12-10 上海梅山钢铁股份有限公司 Converter smelting control method based on slag component prediction
CN108676957A (en) * 2018-06-27 2018-10-19 攀钢集团攀枝花钢铁研究院有限公司 Cold conditions slag renewable resources semi-steel making technique

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刁江: "中高磷铁水转炉双联脱磷的应用基础研究", 《中国优秀博硕士学位论文全文数据库(博士)工程科技Ⅰ辑》 *

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