CN101063651B - Method for detecting molten steel continuous casting protection slag viscosity stability - Google Patents
Method for detecting molten steel continuous casting protection slag viscosity stability Download PDFInfo
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- CN101063651B CN101063651B CN200610026075A CN200610026075A CN101063651B CN 101063651 B CN101063651 B CN 101063651B CN 200610026075 A CN200610026075 A CN 200610026075A CN 200610026075 A CN200610026075 A CN 200610026075A CN 101063651 B CN101063651 B CN 101063651B
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Abstract
This invention provides one steel water connection cast resides stability test method, which through thermal wires to observe protection resides fusing process bubble time to evaluate its adhesive stability, wherein it computes the adhesive bias R formula for adhesive bias; when R is less than 20, it is regarded as best stability and when R is more than 20, as bad stability. This invention method establishes one new resides property evaluation index to improve the evaluation system to ensure the casting process.
Description
Technical field
The present invention relates to detection method, relate in particular to a kind of detection method of molten steel continuous casting protection slag viscosity stability.
Background technology
Covering slag is last one technical factor of steelmaking process, it has adiabatic heat-insulation, prevents molten steel oxidation, absorb be mingled with, multiple function such as lubricated and control heat transfer, be the important assurance of technology direct motion and slab quality.Covering slag viscosity is the important performance indexes that covering slag guarantees back three kinds of functions.The unfavorable covering slag of viscosity will directly have influence on the surface quality of continuous casting billet, and severe patient even deterioration continuous casting process produce bleedout, bring great harm for the production direct motion.Usually covering slag is with CaO, SiO
2Binary is main, joins CaF outward
2, Na
2O, Li
2Fluxs such as O, and a spot of Al
2O
3, constituent element such as MgO, MnO, FeO, thereby reach suitable temperature of fusion and viscosity.For the low-melting relatively covering slag of control can slowly melt at molten steel surface, also must allocate a certain amount of carbonaceous material into, mainly be carbon black and graphite.Be to optimize the meltdown property of covering slag, increasing covering slag tends to carry out earlier fritting and handles, and obtain all more stable basic slag of every performance, and then sneak into carbonaceous material, but these carbonaceous materials must be removed when detecting at high temperature viscosity of covering slag.Way commonly used is 700～900 ℃ of long-time insulations, guaranteeing that the covering slag base-material do not burn the carbon in the slag under the prerequisite of sintering, could measure accurately viscosity then.Viscosity commonly used all is viscometric standardized techniques in respect of rotating cylinder method and vibrating reed method.
At present, covering slag is burnt the result that records after carbon is handled promptly as its viscosity number.Yet long-term working experience shows, at present many covering slags all exist and burn the viscosity number that records behind the carbon phenomenon apparently higher than basic slag viscosity (being actual value).That is to say, allocate into after the carbonaceous material in some basic slag higher tendency is arranged by burning the measured viscosity number of carbon processing.Therefore, for these finished product protection slags, only carry out viscosimetric analysis and be to reflect with the extent of deviation of true viscosity value.In addition, because covering slag manufacturer will finely tune basic slag ingredient according to performance requirement toward contact when joining carbon, therefore basic slag performance and final products performance also have certain difference.Still do not have the Research on Related Problems report both at home and abroad at present, do not have relevant patented claim yet.
Facts have proved; the unsettled covering slag of viscosity brings very big influence in use can for the stability of continuous casting process; the instability of viscosity directly has influence on the lubricated and heat transmission function of covering slag between crystallizer and base shell; cause the copper plate of crystallizer temperature fluctuation violent, the number of times that severe patient activates the warning of bonding steel leakage red card obviously increases.Because famous warning can cause the conticaster auto stop, not only has influence on the direct motion of technology, and slab quality is also produced very big negative effect.
For the covering slag of not allocating carbonaceous material into, the viscosity number when measuring its high temperature (normally 1300 ℃) is all very stable, but handles through burning carbon after allocating carbonaceous material into again, and the viscosity of some covering slag will be obviously higher, and obviously this is relevant with the carbonaceous material of allocating into.By observation, think that producing a large amount of bubbles in the covering slag is to cause the unsettled key factor of viscosity, bubble is many more, and then the higher trend of viscosity is big more.Normal covering slag generally gets final product the carbonaceous material that burning-off is allocated at 800 ℃ of insulation 2h.For the unsettled covering slag of these viscosity, burn the carbon time even prolong, also be difficult to carbon is burnouted.This just shows as in the production use, because carbonaceous material can not all be burnt fast, after covering slag melted fully, remaining carbon just burnt away in melt cinder, constantly forms bubble and discharges.When melt cinder flow in the slit of base shell and copper plate of crystallizer, this process still continued carrying out.Because the existence of bubble has greatly changed the thermal resistance of slag film, therefore cause that the copper plate of crystallizer temperature fluctuation is violent, cause heat transfer inhomogeneous.
In sum, be necessary to find the unsettled short-cut method of a kind of detection covering slag viscosity, and unstable degree be quantitatively described, with the usability of correct evaluation covering slag.
Summary of the invention
Purpose of the present invention is to solve the problems referred to above that prior art exists, and provides a kind of detection method of molten steel continuous casting protection slag viscosity stability, with the usability of correct evaluation covering slag.
The object of the present invention is achieved like this,
A kind of detection method of molten steel continuous casting protection slag viscosity stability utilizes the heated filament instrument to detect, and may further comprise the steps:
A, with the finished product protection slag of certain programming rate heating carbon containing, the intensification scope is room temperature～1400 ℃;
B, record protection slag begin to melt and the moment when having bubble to take place is t
0
C, the moment when the record bubble stops to generate are t
f
D, calculating bubble time of origin are t=t
f-t
0
E, according to the empirical formula that calculates viscosity deviation R
R＝Ae
Bt
Calculate viscosity deviation R;
A, B are the value under the different programming rates in the formula, and when programming rate was 0.5 ℃/s, the A value got 7.51, and the B value gets 0.01; When programming rate was 2 ℃/s, the A value got 3.54, and the B value gets 0.04; When programming rate was 4 ℃/s, the A value got 1.83, and the B value gets 0.10;
F, judge the viscosity stability of covering slag according to the size of R value.
Described heated filament instrument has the Type B thermopair that has heating and temp sensing function concurrently, and described heating is undertaken by micro-covering slag is added on the thermocouple wire, adds thermal effect and shows on computers synchronously by optical microscope and digital camera head.
The described amount that is added in the micro-covering slag on the thermocouple wire is 0.08～0.12mg.
The detection method of molten steel continuous casting protection slag viscosity stability of the present invention has following advantage and characteristics:
1, measures the bubble time of origin t of finished product protection slag in fusion process by the online observation method, the intensification scope is room temperature～1400 ℃, estimates the stability of covering slag viscosity with the t value, and the t value is big more, then the viscosity stability of covering slag is poor more, and is also big more to the potential impact of continuous casting process direct motion;
2, utilize empirical formula can calculate the deviate R of viscosity by t;
3, the viscosity deviation is the place of safety 20% with in, can ignore the influence that the viscosity instability is brought to continuous casting process in this scope;
4,, can be used for predicting the influence degree of covering slag, and then indicate contingent famous alarm rate the copper plate of crystallizer temperature fluctuation by the evaluation of this method to the covering slag viscosity stability;
5, this method has been set up a kind of new covering slag performance evaluation index, and the further perfect performance evaluation system of covering slag helps guaranteeing the direct motion of continuous casting process.
Description of drawings
Bubble time of origin t was to the trend map that influences of viscosity deviation R when Fig. 1 was 0.5 ℃/s for programming rate, and R≤20 are the place of safety;
Bubble time of origin t was to the trend map that influences of viscosity deviation R when Fig. 2 was 2 ℃/s for programming rate, and R≤20 are the place of safety;
Bubble time of origin t was to the trend map that influences of viscosity deviation R when Fig. 3 was 4 ℃/s for programming rate, and R≤20 are the place of safety;
Fig. 4 is the step and the decision flow chart of the detection method of molten steel continuous casting protection slag viscosity stability of the present invention.
Embodiment
Cooperation is referring to Fig. 4, and the detection method of molten steel continuous casting protection slag viscosity stability of the present invention observes the time that continues the generation bubble in the covering slag fusion process estimate the stability of viscosity by the heated filament instrument.The heated filament instrument is a kind of equipment of online observation slag specimen fusion process; have heating and temp sensing function concurrently by the Type B thermopair, be warming up to rapidly with being added in micro-covering slag on the thermocouple wire that temperature required (amount that is added in the micro-covering slag on the thermocouple wire is 0.08～0.12mg).By optical microscope and digital camera head image is shown on computers synchronously.The concrete steps of this method are:
A, with the finished product protection slag of certain programming rate heating carbon containing, the intensification scope is room temperature～1400 ℃;
B, record protection slag begin to melt and the moment when having bubble to take place is t
0
C, the moment when the record bubble stops to generate are t
f
D, calculating bubble time of origin are t=t
f～t
0
E, according to the empirical formula that calculates viscosity deviation R
R＝Ae
Bt
Calculate viscosity deviation R;
F, judging the viscosity stability of covering slag according to the size of R value, is good stability with R≤20, is poor stability with R＞20.
Programming rate described in the step a is traditionally arranged to be 0.5 ℃/s, 2 ℃/s or 4 ℃/s.A, B value under the different programming rates are as shown in table 1:
Table 1
| Programming rate, ℃/s | 0.5 | 2 | 4 |
| A | 7.51 | 3.54 | 1.83 |
| B | 0.01 | 0.04 | 0.10 |
Production practices show, when viscosity deviate R≤20, think the having good stability of viscosity, and can ignore to the influence of continuous casting process.
The detection method of employing molten steel continuous casting protection slag viscosity stability of the present invention detects the viscosity deviate of two kinds of covering slags, and the result is as follows:
Covering slag A, true viscosity is 0.13Pa.s, 750 ℃ are burnt the viscosity that records behind the carbon 4h is 0.27Pa.s.Utilize the DTC2001 type heated filament instrument of University Of Chongqing's development to detect, firing rate is 2 ℃/s, and recording the bubble time of origin is 80s.Utilizing the empirical formula that calculates viscosity deviation R to calculate the viscosity deviate is 101%, and actual deviation is (0.27-0.13)/0.13=108%, and the two coincide fine.
Covering slag B; true viscosity is 0.20Pa.s; 750 ℃ are burnt the viscosity that records behind the carbon 2h is that 0.21Pa.s. utilizes DTC2001 type heated filament instrument to detect; firing rate is 2 ℃/s; recording the bubble time of origin and be 5s., to utilize the empirical formula that calculates viscosity deviation R to calculate the viscosity deviate be 4%; actual deviation is (0.21-0.20)/0.20=5%, and the two coincide fine.
Claims (3)
1. the detection method of a molten steel continuous casting protection slag viscosity stability utilizes the heated filament instrument to detect, and it is characterized in that, may further comprise the steps:
A, with the finished product protection slag of certain programming rate heating carbon containing, the intensification scope is room temperature～1400 ℃;
B, record protection slag begin to melt and the moment when having bubble to take place is t
0
C, the moment when the record bubble stops to generate are t
f
D, calculating bubble time of origin are t=t
f-t
0
E, according to the empirical formula that calculates viscosity deviation R
R＝Ae
Bt
Calculate viscosity deviation R; A, B are the value under the different programming rates in the formula, and when programming rate was 0.5 ℃/s, the A value got 7.51, and the B value gets 0.01; When programming rate was 2 ℃/s, the A value got 3.54, and the B value gets 0.04; When programming rate was 4 ℃/s, the A value got 1.83, and the B value gets 0.10;
F, judge the viscosity stability of covering slag according to the size of R value.
2. the detection method of molten steel continuous casting protection slag viscosity stability as claimed in claim 1,
It is characterized in that: described heated filament instrument has the Type B thermopair that has heating and temp sensing function concurrently, and described heating is undertaken by micro-covering slag is added on the thermocouple wire, adds thermal effect and shows on computers synchronously by optical microscope and digital camera head.
3. the detection method of molten steel continuous casting protection slag viscosity stability as claimed in claim 2,
It is characterized in that: the described amount that is added in the micro-covering slag on the thermocouple wire is 0.08～0.12mg.
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| CN200610026075A CN101063651B (en) | 2006-04-26 | 2006-04-26 | Method for detecting molten steel continuous casting protection slag viscosity stability |
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| CN200610026075A CN101063651B (en) | 2006-04-26 | 2006-04-26 | Method for detecting molten steel continuous casting protection slag viscosity stability |
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| CN101063651B true CN101063651B (en) | 2010-05-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5868027A (en) * | 1996-09-30 | 1999-02-09 | Mississippi State University | Measurement of viscosity of a melt in a plasma centrifugal furnace |
| KR100352588B1 (en) * | 1997-06-20 | 2002-11-13 | 주식회사 포스코 | Method for estimating viscosity of slag of gas furnace |
| CN2660514Y (en) * | 2003-12-19 | 2004-12-01 | 宝钢集团上海梅山有限公司 | Slag viscosity tester |
-
2006
- 2006-04-26 CN CN200610026075A patent/CN101063651B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5868027A (en) * | 1996-09-30 | 1999-02-09 | Mississippi State University | Measurement of viscosity of a melt in a plasma centrifugal furnace |
| KR100352588B1 (en) * | 1997-06-20 | 2002-11-13 | 주식회사 포스코 | Method for estimating viscosity of slag of gas furnace |
| CN2660514Y (en) * | 2003-12-19 | 2004-12-01 | 宝钢集团上海梅山有限公司 | Slag viscosity tester |
Non-Patent Citations (8)
| Title |
|---|
| JP特开平10-142137A 1998.05.29 |
| Yoshiaki KASHIWAYA. et.al..Development of Double and Single HotThermocoupleTechnique for in situ Observation and Measurement of MoldSlag Crystallization.ISIJ International38 4.1998,38(4),348-356. |
| Yoshiaki KASHIWAYA. et.al..Development of Double and Single HotThermocoupleTechnique for in situ Observation and Measurement of MoldSlag Crystallization.ISIJ International38 4.1998,38(4),348-356. * |
| 国家经济贸易委员会.中华人民共和国黑色冶金行业标准YB/T185-2001连铸保护渣粘度试验方法.国家经济贸易委员会,2001,1-3. * |
| 张晨，朱祖民.热丝法在保护渣熔化特性研究上的应用.连铸 3.2005,(3),36-38. |
| 张晨,朱祖民.热丝法在保护渣熔化特性研究上的应用.连铸 3.2005,(3),36-38. * |
| 曹嘉毅，陈中柘.热丝法检测装置研究.电子科技大学学报30 4.2001,30(4),367-370. |
| 曹嘉毅,陈中柘.热丝法检测装置研究.电子科技大学学报30 4.2001,30(4),367-370. * |
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