CN102346159A - Method for testing melting speed of continuous casting powder - Google Patents
Method for testing melting speed of continuous casting powder Download PDFInfo
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- CN102346159A CN102346159A CN2011102807331A CN201110280733A CN102346159A CN 102346159 A CN102346159 A CN 102346159A CN 2011102807331 A CN2011102807331 A CN 2011102807331A CN 201110280733 A CN201110280733 A CN 201110280733A CN 102346159 A CN102346159 A CN 102346159A
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- crucible
- sample
- burn
- rate
- covering slag
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Abstract
The invention relates to a method for testing the melting speed of continuous casting powder. The method is characterized by comprising the following steps of: weighing three parts of casting powder samples by using a scale, wherein each part is 1.49-1.51 g; in the event of raising the temperature, placing a crucible in a furnace, raising the temperature of the furnace to 1350 DEG C, wherein the temperature fluctuation error is +/- 20 DEG C, and keeping the constant temperature for 20 min; taking out the crucible from a hearth, rapidly adding a part of casting powder sample to be tested into the crucible, putting the sample together with the crucible in the furnace, simultaneously, stating a stopwatch to time, and recording the time required for completely melting the sample, namely the time for putting the sample in the hearth till the last dark spot is brightened; calculating the melting speed according to the formula MR=W/tau*A; and repetitively testing according to the above steps and calculating other samples, and then solving an average value to obtain the melting speed MR of the casting powder under the 1350 DEG C condition. The invention aims to provide the method, which is capable of simulating the one-way heating and melting condition of the casting powder on a steel level in a crystallizer and true reflecting the melting speed of the casting powder.
Description
Technical field
The invention belongs to steelmaking technical field, relate to the method for check continuous casting covering slag burn-off rate size.
Background technology
In the middle of the covering slag performance, burn-off rate is one of important physical property, is the physical quantity of a reflection covering slag fusing speed.Burn-off rate is determining the formed melting model structure of covering slag on the interior molten steel face of crystallizer, and covering slag is added on the crystallizer molten steel surface, requires to keep certain thickness stable molten slag layer and slag layer.If the slag layer fusing is too fast, the top of the slag is difficult for keeping, and slag is exposed under the atmosphere, makes often to occur some floating things, oxide film, sintering particle etc. on the molten slag layer surface.This slag that has floating thing near the gap that flows into the meniscus between base shell and the copper wall, possibly cause strand to produce defectives such as slag inclusion, surface crack and pore.And make insufficient lubrication between strand and the crystallizer.Therefore, in casting cycle, always hope on the top of the slag, to have one deck granulated slag to be covered with.Can be heat insulation, can avoid occurring on the slag surface solid floating thing again.Certainly, the burn-off rate of granulated slag can not be slow excessively, otherwise molten slag layer is thin excessively, can not stablize on the meniscus that covers molten steel, causes solid slag to be involved in the gap from meniscus, can cause defectives such as slag inclusion and crackle equally.
Covering slag factory and user are through judging the pre-arcing characterisitics of covering slag to the analysis of the burn-off rate of covering slag.So it is very important accurately measuring the covering slag burn-off rate.
For this reason, the covering slag research of lot of domestic and foreign, production, operation technique staff development multiple burn-off rate assay method.The assay method that is adopted at present has: Seger cone, button slag test (also claiming little slag post method), crucible test, the test of fusion drippage etc.
But no matter all there is certain limitation in which kind of method in practical application.Because the difference of assay method, it measures the result often has very big difference.So, the characteristic and the limitation of analysis the whole bag of tricks, R and D can reflect that more the burn-off rate assay method of the actual melting conditions of covering slag is necessary.
Summary of the invention
The purpose of this invention is to provide a kind of unidirectional melted by heat situation of covering slag on the molten steel face of can simulating in the crystallizer, can reflect the burn-off rate size of covering slag truly.On the molten steel face, should have suitable burn-off rate to covering slag, a kind of method of testing the continuous casting covering slag burn-off rate that method is easy.
The objective of the invention is to realize like this:
A kind of method of testing the continuous casting covering slag burn-off rate is characterized in that:
(a) weigh in the balance and get three parts of covering slag samples, every part 1.49～1.51 gram;
When (b) heating up crucible is put into stove, make stove be warming up to 1350 ℃, the temperature fluctuation error is ± 20 ℃, constant temperature 20min;
(c) crucible is taken out in burner hearth, portion covering slag sample to be measured is added crucible rapidly put into stove together, start stopwatch simultaneously and clock, record sample required time when melting fully, promptly from sample put into burner hearth when last dim spot of sample brightens till;
(d) measure calculating crucible inner bottom surface portion area, and according to formula M
R=W/ τ A calculates burn-off rate;
In the formula: M
R-burn-off rate, kg/m
2S
W-slag weight, kg
A-crucible inner bottom part area, m
2
τ-fusing time, S
(e) according to above-mentioned (b), (c), the repeated test of (d) step, calculate all the other samples, average then, promptly get the burn-off rate M of covering slag under 1350 ℃ of temperature conditions
R: M
R=(M
R1+ M
R2+ M
R3)/3 (kg/m
2S);
(f) when above, then (a)～(e) claims the calculating of appearance mensuration to relative error again that measure the result if any obviously error or each sample in the test value set by step greater than 10%.
Advantage of the present invention:
A kind of method of testing the continuous casting covering slag burn-off rate of the present invention; Easy, and the unidirectional melted by heat situation of covering slag in the simulation crystallizer to greatest extent fast; And the covering slag sample does not need sample preparation; Directly take by weighing the adding crucible; Cost of determination is low, can test out the size of the burn-off rate of covering slag truly.
Embodiment
Embodiment 1～embodiment 3 usefulness places of production are China, are numbered the 10# covering slag:
Embodiment 4～embodiment 6 usefulness places of production are China, are numbered the TY-1 covering slag:
Embodiment 1:
A kind of method of testing the continuous casting covering slag burn-off rate is characterized in that:
(a) weigh in the balance and get three parts of covering slag samples, every part is respectively: 1.497 grams, 1.502 grams, 1.496 grams;
When (b) heating up crucible is put into stove, make stove be warming up to 1350 ℃, the temperature fluctuation error is ± 20 ℃, constant temperature 20min;
(c) crucible is taken out in burner hearth, portion covering slag sample to be measured is added crucible rapidly put into stove together, start stopwatch simultaneously and clock, promptly from sample put into burner hearth when last dim spot of sample brightens till; Required time was 2100 seconds when the record sample melted fully;
(d) measuring calculating crucible inner bottom surface portion area is 314mm
2,, calculate burn-off rate M according to formula MR=W/ τ A
R=2.27 * 10
-3Kg/m
2S;
In the formula: M
R-burn-off rate, kg/m
2S
W-slag weight, kg
A-crucible inner bottom part area, m
2
τ-fusing time, S
(e) according to above-mentioned (b), (c), the repeated test of (d) step, calculate all the other 2 samples, average then, promptly get the burn-off rate M of covering slag under 1350 ℃ of temperature conditions
R: M
R=(M
R1+ M
R2+ M
R3)/3 (kg/m
2S).
Table 1 has been put down in writing the place of production and has been the covering slag numbering 10# of China, chemical constitution and the physical property of TY-1.
Table 1: experiment covering slag 10#, TY-1 chemical constitution and physical property
Table 2 is with test and the result of method of the present invention to embodiment 1～3 covering slag numbering 10# burn-off rate.
Table 3 is with the reach result of method of the present invention to the test of embodiment 4～6 covering slag code T Y-1 burn-off rates.
The method of testing of embodiment 2～embodiment 6 is identical with embodiment 1, and its concrete data are seen table 2 and table 3.
Table 2: the burn-off rate result of embodiment 1～embodiment 3 test covering slag numbering 10#
Table 3: the burn-off rate result of embodiment 4～embodiment 6 test covering slag code T Y-1
The result can get by the covering slag repeated test, and this test continuous casting covering slag burn-off rate method is more stable, and test result is believable.
Claims (1)
1. method of testing the continuous casting covering slag burn-off rate is characterized in that:
(a) weigh in the balance and get three parts of covering slag samples, every part 1.49～1.51 gram;
When (b) heating up crucible is put into stove, make stove be warming up to 1350 ℃, the temperature fluctuation error is ± 20 ℃, constant temperature 20min;
(c) crucible is taken out in burner hearth, portion covering slag sample to be measured is added crucible rapidly put into stove together, start stopwatch simultaneously and clock, record sample required time when melting fully, promptly from sample put into burner hearth when last dim spot of sample brightens till;
(d) measure calculating crucible inner bottom surface portion area, and according to formula M
R=W/ τ A calculates burn-off rate;
In the formula: M
R-burn-off rate, kg/m
2S
W-slag weight, kg
A-crucible inner bottom part area, m
2
τ-fusing time, S
(e) according to above-mentioned (b), (c), the repeated test of (d) step, calculate all the other samples, average then, promptly get the burn-off rate M of covering slag under 1350 ℃ of temperature conditions
R: M
R=(M
R1+ M
R2+ M
R3)/3 (kg/m
2S);
(f) when above, then (a)～(e) claims the calculating of appearance mensuration to relative error again that measure the result if any obviously error or each sample in the test value set by step greater than 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102807331A CN102346159A (en) | 2011-09-10 | 2011-09-10 | Method for testing melting speed of continuous casting powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102807331A CN102346159A (en) | 2011-09-10 | 2011-09-10 | Method for testing melting speed of continuous casting powder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102346159A true CN102346159A (en) | 2012-02-08 |
Family
ID=45545032
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|---|---|---|---|
| CN2011102807331A Pending CN102346159A (en) | 2011-09-10 | 2011-09-10 | Method for testing melting speed of continuous casting powder |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721718A (en) * | 2012-06-11 | 2012-10-10 | 内蒙古包钢钢联股份有限公司 | Method for judging heat transfer property of liquid-state protecting slag in crystallizer |
| CN103063537A (en) * | 2013-01-17 | 2013-04-24 | 武钢集团昆明钢铁股份有限公司 | Method for measuring melting speed of continuous casting covering slag |
| CN105372157A (en) * | 2015-12-21 | 2016-03-02 | 本钢板材股份有限公司 | Distilling structure of gieseler plastometer |
| CN107356624A (en) * | 2017-05-27 | 2017-11-17 | 内蒙古包钢钢联股份有限公司 | Judge the method for crystallizer protecting residue burn-off rate |
| CN109738443A (en) * | 2019-01-30 | 2019-05-10 | 中南大学 | Analyze the method and system of the flourishing layer migration velocity of sintering cup test |
| CN112362524A (en) * | 2020-10-30 | 2021-02-12 | 山东莱钢永锋钢铁有限公司 | Method for testing water yield of granular steel sample |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2572401Y (en) * | 2002-09-04 | 2003-09-10 | 武汉钢铁(集团)公司 | Protective slag smelting speed tester |
| CN1690688A (en) * | 2004-04-29 | 2005-11-02 | 宝山钢铁股份有限公司 | Method for detecting speed of melting of protecting slag |
-
2011
- 2011-09-10 CN CN2011102807331A patent/CN102346159A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2572401Y (en) * | 2002-09-04 | 2003-09-10 | 武汉钢铁(集团)公司 | Protective slag smelting speed tester |
| CN1690688A (en) * | 2004-04-29 | 2005-11-02 | 宝山钢铁股份有限公司 | Method for detecting speed of melting of protecting slag |
Non-Patent Citations (1)
| Title |
|---|
| 智建国 等: "结晶器保护渣熔化速度测定方法的研究", 《耐火材料》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102721718A (en) * | 2012-06-11 | 2012-10-10 | 内蒙古包钢钢联股份有限公司 | Method for judging heat transfer property of liquid-state protecting slag in crystallizer |
| CN102721718B (en) * | 2012-06-11 | 2014-06-18 | 内蒙古包钢钢联股份有限公司 | Method for judging heat transfer property of liquid-state protecting slag in crystallizer |
| CN103063537A (en) * | 2013-01-17 | 2013-04-24 | 武钢集团昆明钢铁股份有限公司 | Method for measuring melting speed of continuous casting covering slag |
| CN105372157A (en) * | 2015-12-21 | 2016-03-02 | 本钢板材股份有限公司 | Distilling structure of gieseler plastometer |
| CN107356624A (en) * | 2017-05-27 | 2017-11-17 | 内蒙古包钢钢联股份有限公司 | Judge the method for crystallizer protecting residue burn-off rate |
| CN107356624B (en) * | 2017-05-27 | 2020-06-16 | 内蒙古包钢钢联股份有限公司 | Method for judging melting speed of crystallizer covering slag |
| CN109738443A (en) * | 2019-01-30 | 2019-05-10 | 中南大学 | Analyze the method and system of the flourishing layer migration velocity of sintering cup test |
| CN112362524A (en) * | 2020-10-30 | 2021-02-12 | 山东莱钢永锋钢铁有限公司 | Method for testing water yield of granular steel sample |
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Application publication date: 20120208 |