CN109270239A - A kind of slag absorbs the evaluation method of field trash ability - Google Patents
A kind of slag absorbs the evaluation method of field trash ability Download PDFInfo
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- CN109270239A CN109270239A CN201710569502.XA CN201710569502A CN109270239A CN 109270239 A CN109270239 A CN 109270239A CN 201710569502 A CN201710569502 A CN 201710569502A CN 109270239 A CN109270239 A CN 109270239A
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- slag
- inclusion
- field trash
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Abstract
The present invention relates to the evaluation methods that a kind of slag absorbs field trash ability, comprising: 1) when refining starts, after flux is added into molten steel, takes steel sample X1 and slag specimen Y1 immediately, calculate saturation solubility of the field trash in slag；2) viscosity number R of the detection slag under refining temperature；3) after refining, steel sample X2 and slag specimen Y2 are taken, actual solubility of the field trash in slag is detected by slag specimen Y2；4) inclusion content in steel sample X1 and X2 is detected respectively, calculates inclusion removal rate；5) slag dross inclusion adsorption Capability index I is calculated, the ability and slag dross inclusion adsorption Capability index I of slag dross inclusion adsorption are positively correlated.The present invention evaluates it for the absorbability of field trash by slag self performance, and evaluation method is more intuitive, reliable, can be used for effectively slag being instructed to adjust, is conducive to the cleanliness for further increasing steel, realizes the smelting of ultrapure steel.
Description
Technical field
The present invention relates to the evaluation methods that steelmaking technical field more particularly to a kind of slag absorb field trash ability.
Background technique
With the continuous development of steel industry, requirement of the people to steel comprehensive performance is also higher and higher, correspondingly to steel
The requirement of cleanliness is also increasingly stringenter.The presence of non-metallic inclusion seriously reduces the cleanliness of steel, influences steel
Various performances, can not only be substantially reduced the plasticity of steel, toughness, weldability and corrosion resistant candle property, also result in stress concentration, draw
Play fatigue fracture.
Field trash enters in steel slag there are three process, floats, separates and is dissolved into steel slag, first process is field trash
Slag interface is floated to from molten steel, second process is that surface tension field trash is overcome to stablize in slag interface, third process
It is that field trash is dissolved into steel slag, if there is no just having field trash and be involved in molten steel again most latter two process
It is dangerous.
Studies have shown that solid inclusions floats to the speed (7s or so) at slag gold interface from molten steel, and from Zha Jin circle
The influence that surface tension is broken through in face enters the speed (7 × 10 in slag-4S) very fast, therefore being dissolved into the reaction in slag is to restrict
Field trash is adsorbed onto the key reaction in slag.
Focus mostly on how to remove the field trash in molten steel about the research of field trash at present, such as by blowing air into steel
Liquid forms micro-bubble, stirs means, acceleration and the floatings for promoting field trash such as molten steel, vacuum cycle processing molten steel, and these
Can the field trash that steel slag liquid level finally floated to effectively be adsorbed onto the concern for but seldom causing people in slag；Steel slag liquid level is such as
Fruit has accumulated excessive field trash, cannot effectively be adsorbed onto slag, can be involved in molten steel again under certain conditions, reduces steel
The degree of purity of material, to restrict further increasing for steel degree of purity, it is therefore necessary to carry out about slag dross inclusion adsorption energy
The research of power.
It is more for the evaluation method of molten steel cleanliness, have the evaluation criterion of field trash, metallographic method, extremum method, spectroscopic methodology,
ASPEX scan statistics method etc., and the research about slag dross inclusion adsorption ability is then seldom, also without relevant evaluation side
Method can only be the ability for reversely inferring refining slag dross inclusion adsorption by the improvement of molten steel cleanliness, cannot directly instruct essence
The exploitation for refining slag system, becomes the obstruction of steel degree of purity raising, therefore develops a kind of evaluation side of slag dross inclusion adsorption ability
Method just seems very necessary.
Summary of the invention
The present invention provides the evaluation methods that a kind of slag absorbs field trash ability, and it is right to evaluate its by slag self performance
In the absorbability of field trash, evaluation method is more intuitive, reliable, can be used for effectively slag being instructed to adjust, and is conducive to further
The cleanliness for improving steel, realizes the smelting of ultrapure steel.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of slag absorbs the evaluation method of field trash ability, comprising:
1) when refining starts, after flux is added into molten steel, steel sample X1 and slag specimen Y1 are taken immediately；Detect the chemistry of slag specimen Y1
At being grouped as and content, passes through FactSage software or thermodynamics method calculates saturation solubility of the field trash in slag
Inclusionsat；
2) by slag specimen Y1, viscosity number R of the slag under refining temperature is detected；
3) after refining, steel sample X2 and slag specimen Y2 are taken, practical dissolution of the field trash in slag is detected by slag specimen Y2
Spend Inclusionbulk；
4) inclusion content in steel sample X1 and X2 is detected respectively, calculates inclusion removal rate △ X,
5) slag dross inclusion adsorption Capability index I is calculated,Slag dross inclusion adsorption
Ability and slag dross inclusion adsorption Capability index I be positively correlated.
It is detected when detection steel sample inclusion content using scanning electron microscope in step 4).
Compared with prior art, the beneficial effects of the present invention are:
With it is existing by steel sample evaluate slag to the method for field trash absorbability compared with, the present invention pass through slag itself property
It can be evaluated for the absorbability of field trash, evaluation method is more intuitive, reliable, can be used for effectively slag being instructed to adjust, have
Conducive to the cleanliness for further increasing steel, the smelting of ultrapure steel is realized.
Specific embodiment
A kind of slag of the present invention absorbs the evaluation method of field trash ability, comprising:
1) when refining starts, after flux is added into molten steel, steel sample X1 and slag specimen Y1 are taken immediately；Detect the chemistry of slag specimen Y1
At being grouped as and content, passes through FactSage software or thermodynamics method calculates saturation solubility of the field trash in slag
Inclusionsat；
2) by slag specimen Y1, viscosity number R of the slag under refining temperature is detected；
3) after refining, steel sample X2 and slag specimen Y2 are taken, practical dissolution of the field trash in slag is detected by slag specimen Y2
Spend Inclusionbulk；
4) inclusion content in steel sample X1 and X2 is detected respectively, calculates inclusion removal rate △ X,
5) slag dross inclusion adsorption Capability index I is calculated,Slag dross inclusion adsorption
Ability and slag dross inclusion adsorption Capability index I be positively correlated.
It is detected when detection steel sample inclusion content using scanning electron microscope in step 4).
Slag absorbs the ability of field trash and itself accommodates field trash ability, absorbs field trash driving force (field trash saturation
The difference of melting degree and the practical melting degree of dross inclusions object) and viscosity coefficient of dross it is closely related, therefore the present invention is comprehensive by factors above
After consideration, evaluated using the ability that slag dross inclusion adsorption Capability index I absorbs field trash to slag.
Following embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
Not mentionleting alone bright is conventional method.
[embodiment]
The present embodiment smelts Q345B steel, and main inclusions ingredient therein is Al2O3, process route is BOF → LF → RH
→ CC, same adjustment refining slag ingredient when pouring time different tanks time refinings have carried out 4 altogether and have poured time；Using the method for the invention
Analyze the ability of different refining slag dross inclusion adsorptions, the specific steps are as follows:
1) when LF refining starts, after alloy, flux is added, steel sample X1, slag specimen Y1 are taken immediately；
2) after RH refining, steel sample X2, slag specimen Y2 are taken；
3) chemical component (as shown in table 1) of slag specimen Y1, inclusion content and inclusion removal rate in steel sample X1, X2 are detected
△ X is as shown in table 2；
4) the saturation melting degree for calculating aluminium oxide in slag specimen Y1, detects the actual content of aluminium oxide in slag specimen Y2, detects slag
The viscosity number R of sample Y1 finally calculates slag and absorbs field trash Capability index I, as shown in table 3；
5) slag dross inclusion adsorption Capability index I combination inclusion removal rate △ X is calculated, slag dross inclusion adsorption is evaluated
Ability；
Table 1 refines slag ingredient (mass percentage %)
| It pours secondary | CaO | SiO2 | Al2O3 | MgO | FeO |
| 1 | 53.91 | 17.29 | 8.97 | 16.76 | 1.65 |
| 2 | 53.55 | 16.93 | 15.86 | 11.14 | 1.34 |
| 3 | 49.45 | 17.37 | 15.39 | 14.41 | 1.74 |
| 4 | 43.80 | 16.82 | 14.22 | 22.27 | 1.23 |
2 steel sample inclusion content (area mm of table2)
| It pours secondary | X1 | X2 | △X |
| 1 | 1.78 | 0.88 | 50% |
| 2 | 1.45 | 0.15 | 90% |
| 3 | 0.37 | 0.24 | 35% |
| 4 | 0.62 | 0.19 | 69% |
3 slag alumina content (mass percentage %) of table and viscosity number (Pas)
Using the data in table 2, table 3, calculates and respectively pour time slag dross inclusion adsorption index I；Respectively 1.047 × 103、
1.289×103、0.981×103、1.118×103, corresponding inclusion removal rate is respectively 50%, 90%, 35%, 69%,
It can be seen that slag dross inclusion adsorption index I increases with the increase of inclusion removal rate, the two is positively correlated, slag dross inclusion adsorption
Index I can be used in evaluating the ability of slag dross inclusion adsorption.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (2)
1. the evaluation method that a kind of slag absorbs field trash ability characterized by comprising
1) when refining starts, after flux is added into molten steel, steel sample X1 and slag specimen Y1 are taken immediately；Detect the chemical component of slag specimen Y1
Composition and content calculate saturation solubility of the field trash in slag by FactSage software or thermodynamics method
Inclusionsat；
2) by slag specimen Y1, viscosity number R of the slag under refining temperature is detected；
3) after refining, steel sample X2 and slag specimen Y2 are taken, actual solubility of the field trash in slag is detected by slag specimen Y2
Inclusionbulk；
4) inclusion content in steel sample X1 and X2 is detected respectively, calculates inclusion removal rate △ X,
5) slag dross inclusion adsorption Capability index I is calculated,The energy of slag dross inclusion adsorption
Power and slag dross inclusion adsorption Capability index I are positively correlated.
2. the evaluation method that a kind of slag according to claim 1 absorbs field trash ability, which is characterized in that in step 4)
It is detected when detecting steel sample inclusion content using scanning electron microscope.
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Citations (7)
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| CN1061381C (en) * | 1991-12-24 | 2001-01-31 | 川崎制铁株式会社 | Method of refining of high purity steel |
| CN101131371A (en) * | 2007-10-08 | 2008-02-27 | 苏州阿特斯阳光电力科技有限公司 | Impurity content detecting and analyzing method for refined metallurgy silicon |
| CN101323893A (en) * | 2008-07-30 | 2008-12-17 | 鞍钢股份有限公司 | Technological process for removing fine occluded foreignsubstance in molten steel |
| CN103630665A (en) * | 2013-12-03 | 2014-03-12 | 北京科技大学 | Multistage sampling and system analyzing method for analyzing nonmetallic inclusions in steels |
| CN104406893A (en) * | 2014-11-10 | 2015-03-11 | 东北大学 | Method for measuring dissolution speed of solid inclusion in slag |
| CN105693116A (en) * | 2016-02-03 | 2016-06-22 | 重庆大学 | Method for removing calcium and magnesium impurities by using waste heat of high-temperature titanium slag |
| CN104502558B (en) * | 2014-12-18 | 2016-08-24 | 本钢板材股份有限公司 | Utilize electroslag remelting to the method detecting slag iron-holder |
-
2017
- 2017-07-13 CN CN201710569502.XA patent/CN109270239A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1061381C (en) * | 1991-12-24 | 2001-01-31 | 川崎制铁株式会社 | Method of refining of high purity steel |
| CN101131371A (en) * | 2007-10-08 | 2008-02-27 | 苏州阿特斯阳光电力科技有限公司 | Impurity content detecting and analyzing method for refined metallurgy silicon |
| CN101323893A (en) * | 2008-07-30 | 2008-12-17 | 鞍钢股份有限公司 | Technological process for removing fine occluded foreignsubstance in molten steel |
| CN103630665A (en) * | 2013-12-03 | 2014-03-12 | 北京科技大学 | Multistage sampling and system analyzing method for analyzing nonmetallic inclusions in steels |
| CN104406893A (en) * | 2014-11-10 | 2015-03-11 | 东北大学 | Method for measuring dissolution speed of solid inclusion in slag |
| CN104502558B (en) * | 2014-12-18 | 2016-08-24 | 本钢板材股份有限公司 | Utilize electroslag remelting to the method detecting slag iron-holder |
| CN105693116A (en) * | 2016-02-03 | 2016-06-22 | 重庆大学 | Method for removing calcium and magnesium impurities by using waste heat of high-temperature titanium slag |
Non-Patent Citations (1)
| Title |
|---|
| 杨景军: "特殊钢高Al2O3精炼渣系热力学性质及物性参数研究", 《中国博士学位论文全文数据库 工程科技Ⅰ辑》 * |
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