CN104846147A - Calcium treatment process control model - Google Patents
Calcium treatment process control model Download PDFInfo
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- CN104846147A CN104846147A CN201510227714.0A CN201510227714A CN104846147A CN 104846147 A CN104846147 A CN 104846147A CN 201510227714 A CN201510227714 A CN 201510227714A CN 104846147 A CN104846147 A CN 104846147A
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Abstract
The invention discloses a calcium treatment process control model, comprising the following steps: I, counting data: carrying out a statistic analysis according to data information obtained under an existing calcium treatment process condition, so as to provide a foundation for establishing the calcium treatment process control model; II, analyzing data: carrying out a thermomechanical analysis according to compositions of molten steel, so as to obtain a calcium line feeding rate when a optimal treatment effect of aluminium oxide inclusions in the molten steel is realized; III, integrating data: obtaining a reasonable calcium feeding rate according to analysis and calculating results, integrating counting and analyzing processes, so as to form the calcium treatment process control model to guide an on-site calcium treatment process. According to the calcium treatment process control model provided by the invention, the thermomechanical analysis can be carried out according to chemical compositions of steel to determine the optimal calcium treatment feeding rate, improve the calcium treatment efficiency and yield, and efficiently improve the purity of the molten steel while lowering the calcium treatment cost.
Description
Technical field
The present invention relates to a kind of Calcium treatment technology control model, specifically a kind of steelmaking process Calcium treatment technique precise control model, belongs to field of steel-making.
Background technology
Along with steel grade demand steady-state growths such as pipe line steel, bridge slab, pressurized vessel slab and high-strength slabs, also more and more higher to the requirement of steel product quality and performance, increasingly harsh to the requirement of the index such as Molten Steel Cleanliness and level of inclusions.Calcium treatment is a kind of liquid steel refining means that 20 century 70s grow up, and what apply at present is the method that calcium line fed by ladle.It is that calcium alloy (Ca, Ca-Si, Ca-Fe etc.) sheetmetal parcel is made cored-wire, by the guide wire of wire feeder, it is inserted molten steel with very high speed.Feed simultaneously with stirring of inert gas in silk process, to increase the residence time of Ca in molten steel and to carry out good mixing.This method is widely applied and achieves howling success in global iron and steel enterprise.
Through the development of nearly 30 years, Calcium treatment technology was quite ripe, had become indispensable important step in modern steel production.Calcium treatment technology has function molten steel to deep deoxidation, desulfurization and inclusion modification, can effectively improve Cleanliness of Molten Steel, prevents nozzle clogging and improve pourability of molten steel.
Calcium treatment technique has become a kind of refining means being widely used in the higher aluminium deoxidation high-quality steel grade stove of purity requirement and processing outward, and other substitute modes are not yet found in its effect.But, if it is improper that Calcium treatment controls, can cause the quality of steel and have a strong impact on: (1) is when calcium add-on is too low, high melting compound CaO6Al2O3 and CaO2Al2O3 may be formed, these solid inclusions are more more tough and tensile than aluminum oxide, are difficult to removing of floating because fusing point is too high in molten steel; (2) when Calcium treatment add-on is too large, because the vapour pressure of calcium is very large, molten steel surface will be caused to seethe and to cause secondary oxidation, stirring intensity is excessive, cause the reaction between ladle slag, cause Ca and Mg in slag or in refractory materials to be delivered in molten steel, form magnesium-aluminium spinel and be mingled with.Excessive calcium and reaction of Salmon-Saxl produce CaS simultaneously, are easily enriched in certain area, affect the performance of steel.
Therefore, suitable calcium line feed quantity is the prerequisite improving Molten Steel Cleanliness, accurately controls Calcium treatment technique and seems particularly important.Effective control of Calcium treatment technique, for the recovery rate improving calcium, improves Molten Steel Cleanliness significant.
Summary of the invention
In view of the defect that above-mentioned prior art exists, the object of the invention is to propose a kind of steelmaking process Calcium treatment technique precise control model, this model carries out associated hot mechanical analysis according to steel grade chemical composition, determine best Calcium treatment feed quantity, reach the accurate control of Calcium treatment technique, improve recovery rate and the calcium treatment effect of calcium.
Object of the present invention, will be achieved by the following technical programs: a kind of Calcium treatment technology control model, comprises the following steps:
I, statistic data: the data message according to drawing under existing Calcium treatment processing condition carries out statistical study, obtains the recovery rate of the calcium under 200m calcium line feed quantity condition, provides basis for setting up Calcium treatment technology control model;
II, analytical data: carry out thermomechanical analysis according to molten steel composition, by calcium recovery rate be 20% situation based on, draw the calcium line feed quantity during optimum handling effect realizing aluminate in molten steel;
III, integrated data: draw rational calcium line feed quantity according to analysis and calculation result, undertaken integrated by Classified statistics process, forms Calcium treatment technology control model with guide field Calcium treatment technique.
Further, aforesaid Calcium treatment technology control model, data statistical analysis method in step I is benchmark for being 20% at 200m calcium line feed quantity and calcium recovery rate, analyzes the calcium line feed quantity obtaining aluminate optimum handling effect in molten steel, sets up Calcium treatment technology control model.
Further, aforesaid Calcium treatment technology control model, in step II, the step of analytical data is:
I, control Calcium treatment amount according to the content of S in molten steel, reducing sulfide inclusion content by controlling calcium sulfur ratio scope, forming dispergated CaS;
II, probe into dispersed and do not formed string tufted containing the reasonable terms of Ca oxide inclusion, reach reduction inclusion size, improve molten steel cleanness;
III, according to acid-soluble aluminum content in molten steel, control suitable calcium aluminum ratio, based on calculation of thermodynamics formula (asking contriver to supplement), draw Al
2o
3be mingled with liquefy calcium-aluminate C
12a
7reasonable calcium amount, thus draw the correct feed quantity of calcium line.
Further, aforesaid Calcium treatment technology control model, the thermodynamic calculation method in step II is with calculation of thermodynamics formula 12CaO+7Al
2o
3=12CaO7Al
2o
3based on, obtain Al by the calcium aluminum ratio controlled in molten steel
2o
3be mingled with liquefy calcium-aluminate C
12a
7calcium line feed quantity.
The present invention, its outstanding effect is: a kind of Calcium treatment technology control model provided by the invention, associated hot mechanical analysis can be carried out according to steel grade chemical composition, determine best Calcium treatment feed quantity, improve the recovery rate of Calcium treatment efficiency and calcium, while reduction Calcium treatment cost, effectively improve Molten Steel Cleanliness.
Below just accompanying drawing in conjunction with the embodiments, is described in further detail the specific embodiment of the present invention, is easier to understand, grasp to make technical solution of the present invention.
Accompanying drawing explanation
Fig. 1 is the Al-Ca-S ternary molar fraction figure of composition of inclusions of the present invention change.
Embodiment
Embodiment 1
A kind of Calcium treatment technology control model, comprises the following steps:
First, the data message according to drawing under existing Calcium treatment processing condition carries out statistical study, and the recovery rate obtaining the calcium under 200m calcium line feed quantity condition is 20%, provides basis for setting up Calcium treatment technology control model;
Secondly, thermomechanical analysis is carried out according to molten steel composition, by calcium recovery rate be 20% situation based on, draw the calcium line feed quantity during optimum handling effect realizing aluminate in molten steel, as shown in Figure 1: under same temperature condition, when Ca and S content is than when being 1:1, first, content according to S in molten steel controls calcium sulfur ratio scope, and in the present embodiment, the content of S is 0.0010%; And by controlling calcium sulfur ratio scope, forming dispergated CaS as far as possible, CaS enrichment in molten steel solidification process can be prevented like this, to ensure that inclusion content in melting steel is with 12CaO7Al
2o
3liquid form exists, to float removing.
Meanwhile, probe into dispersed and do not formed string tufted containing the condition of Ca oxide inclusion, reach reduction inclusion size, improve the object of molten steel cleanness.
And according to the acid-soluble aluminum content in molten steel: Alt-0.035%, control suitable calcium aluminum ratio, with calculation of thermodynamics formula 12CaO+7Al
2o
3=12CaO7Al
2o
3based on, when the ratio range of calcium aluminum ratio is (1.26), draw Al
2o
3be mingled with liquefy calcium-aluminate C
12a
7need calcium amount for (0.0441), converting according to the recovery rate of calcium show that calcium line feed quantity is 180m.
Finally, calcium line feed quantity is drawn according to analysis and calculation result, inclusion analysis evaluation is carried out to steel plate, steel plate main inclusions type is that 12CaO7Al2O3, CaO-CaS are mingled with, by effective utilization of Calcium treatment process modeling, realize calcium line accurately to control, improve Calcium treatment efficiency and Molten Steel Cleanliness simultaneously.Classified statistics process is carried out integrated, forms Calcium treatment technology control model with guide field Calcium treatment technique.
Claims (4)
1. a Calcium treatment technology control model, is characterized in that: comprise the following steps:
I, statistic data: the data message according to drawing under existing Calcium treatment processing condition carries out statistical study, obtains the recovery rate of the calcium under 100m ~ 300m calcium line feed quantity condition, provides basis for setting up Calcium treatment technology control model;
II, analytical data: carry out thermomechanical analysis according to molten steel composition, by calcium recovery rate be 10% ~ 30% situation based on, the calcium line feed quantity in accomplished molten steel during the optimum handling effect of aluminate;
III, integrated data: draw the calcium line feed quantity under different steel grades control condition according to analysis and calculation result, undertaken integrated by Classified statistics process, forms Calcium treatment technology control model with guide field Calcium treatment technique.
2. Calcium treatment technology control model according to claim 1, it is characterized in that: the data statistical analysis method in described step I is benchmark for being 20% at 200m calcium line feed quantity and calcium recovery rate, analyze the calcium line feed quantity obtaining aluminate optimum handling effect in molten steel, set up Calcium treatment technology control model.
3. Calcium treatment technology control model according to claim 1, is characterized in that: in described step II, the step of analytical data is:
I, control Calcium treatment amount according to the content of S in molten steel, control calcium sulfur ratio scope, reducing sulfide inclusion content by controlling calcium sulfur ratio scope, forming dispergated CaS to reduce sulfide inclusion content;
II, probe into dispersed and do not form the calcium line feed quantity of string cluster inclusion, reaching and reduce inclusion size and improve the object of molten steel cleanness;
III, according to acid-soluble aluminum content in molten steel, control suitable calcium aluminum ratio, based on calculation of thermodynamics formula, draw A1
2o
3be mingled with liquefy calcium-aluminate C
12a
7calcium amount, thus draw the correct feed quantity of calcium line.
4. Calcium treatment technology control model according to claim 1, is characterized in that: the thermodynamic calculation method in described step II is: with calculation of thermodynamics formula 12CaO+7 A1
2o
3=12 CaO7 A1
2o
3based on, obtain A1 by the calcium aluminum ratio controlled in molten steel
2o
3be mingled with liquefy calcium-aluminate C
12a
7calcium line feed quantity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385148A (en) * | 2017-06-27 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | A kind of control method of high-grade pipe line steel non-metallic inclusion |
Citations (2)
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|---|---|---|---|---|
| CN102268512A (en) * | 2011-07-08 | 2011-12-07 | 攀钢集团有限公司 | Control method for inclusion in steel |
| CN103614513A (en) * | 2013-12-04 | 2014-03-05 | 南京钢铁股份有限公司 | Calcium treatment method under special steelmaking process |
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2015
- 2015-05-06 CN CN201510227714.0A patent/CN104846147B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268512A (en) * | 2011-07-08 | 2011-12-07 | 攀钢集团有限公司 | Control method for inclusion in steel |
| CN103614513A (en) * | 2013-12-04 | 2014-03-05 | 南京钢铁股份有限公司 | Calcium treatment method under special steelmaking process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385148A (en) * | 2017-06-27 | 2017-11-24 | 包头钢铁（集团）有限责任公司 | A kind of control method of high-grade pipe line steel non-metallic inclusion |
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