CN103837062A - Method for detecting casting powder situation of crystallizer - Google Patents
Method for detecting casting powder situation of crystallizer Download PDFInfo
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- CN103837062A CN103837062A CN201410058605.6A CN201410058605A CN103837062A CN 103837062 A CN103837062 A CN 103837062A CN 201410058605 A CN201410058605 A CN 201410058605A CN 103837062 A CN103837062 A CN 103837062A
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Abstract
The invention relates to a method for detecting the casting powder situation of a crystallizer. The method comprises the following steps that firstly, a detecting tool is close to the narrow face position of the crystallizer and is a splat fixedly connected with five iron wires; secondly, the detecting tool is horizontally placed in the crystallizer; thirdly, when the submersed nozzle insertion depth is in the range of 140+/-1 mm, the detecting tool stays for 7-8 s, and the liquid casting powder layer thickness and the total casting powder layer thickness of casting powder at the positions of the iron wires are measured; fourthly, when the submersed nozzle insertion depth is in the range of 150+/-1 mm, the detecting tool stays for 11-13 s, and the liquid casting powder layer thickness and the total casting powder layer thickness of the casting powder at the positions of the iron wires are measured; fifthly, when the submersed nozzle insertion depth is in the range of 160+/-1 mm, the detecting tool stays for 14-16 s, and the liquid casting powder layer thickness and the total casting powder layer thickness of the casting powder at the positions of the iron wires are measured. According to the method for detecting the casting powder situation of the crystallizer, the crystallizer surface molten steel flow field and the casting powder melting situation can be displayed.
Description
Technical field
The present invention relates to a kind of method that detects crystallizer protecting residue situation.
Background technology
In continuous casting installation for casting, crystallizer is referred to as the heart of conticaster, and the Link role that to accept high-temperature molten steel coagulation forming be solid-state strand has directly determined the quality of surface quality of continuously cast slab simultaneously.
According to traditional theory, the flow field of molten steel in crystallizer is divided into meniscus district, close contact district, air gap district three parts from top to bottom successively, and is divided into successively from outside to inside in the horizontal direction initial solidification shell district, He Yexin district, mushy zone three parts.The stable formation of meniscus district initial solidification shell has directly affected the surface quality of continuous casting billet, and surperficial steel fluid field and the quality of changing slag effect are producing material impact to cc billet surface quality (as scab, depression, slag inclusion etc.).Therefore, need to strengthen the research to crystallizer flow field, further improve cc billet surface quality.At present, domestic metallurgical continuous casting slab production run, adopts the double-side-hole mouth of a river conventionally.Flow out molten steel by the double-side-hole mouth of a river and in crystallizer, formed respectively backflow and two flow field regions of lower backflow.Upper recirculating zone has directly affected the degree of surperficial molten steel flow velocity, covering slag fusing effect, inclusion floating removal.If upper recirculating zone is too small, cause protection scorification slag effect bad, poor to base shell lubricant effect in crystallizer, easily cause the surface imperfection such as strand generation scabs, depression; Otherwise, if upper recirculating zone is excessive, can cause the interface disorder of crystallizer surface molten steel-covering slag, cause strand to form slag inclusion, wrap up in the surface imperfection such as slag.
In existing detection crystallizer, the method for covering slag situation is single-spot way; by using an iron wire to be inserted in covering slag and molten steel; observe iron wire melting loss situation and measure liquid slag layer, sinter layer and slag layer thickness, and there is no any research for the method that detects crystallizer surface flow field of molten steel.
Summary of the invention
For a gram above-mentioned deficiency for the method for existing detection crystallizer protecting residue situation, provide a kind of method that shows the detection crystallizer protecting residue situation of crystallizer surface flow field of molten steel and covering slag fusing situation with simple tool.
For addressing these problems; design the self-made tool of multiple spot detection crystallizer surface flow field of molten steel and covering slag situation; by testing result, guarantee suitable upper recirculating zone for working out suitable technological parameter, and then the finished product strand of producing excellent surface quality provides reliable theoretical foundation.
The present invention is by detection limit instrument, can disposablely measure broad ways diverse location place liquid slag layer thickness in crystallizer simultaneously, in conjunction with under different technical parameters condition, the measurement result of each position, Comprehensive Comparison, can play important directive function for optimizing casting parameters.
Technical conceive of the present invention is considered in view of following several respects:
(1) fusing point of thin wire is between covering slag and molten steel.Wherein, the fusing point of covering slag is 1300～1350 DEG C; Molten steel fusing point is 1420～1520 DEG C; And between the fusing point of thin wire between covering slag and molten steel, be between 1400～1450 DEG C.
(2) iron wire melts in molten steel a process, and liquid steel temperature is higher, and burn-off rate is faster.By controlling the residence time of thin wire in molten steel, the iron wire that contacts molten steel has just been melted completely, and the iron wire of contact protection slag can not be melted and be as the criterion.
(3) after iron wire and covering slag effect, surface is three kinds of forms: the iron wire of contact melt cinder part is smooth surface characteristics, can reflect the thickness of liquid slag layer; The iron wire of contact sinter layer part is coarse surface characteristics, reflects the thickness of sinter layer; The iron wire of contact slag layer only has slight oxidation blackout phenomenon, reflects the thickness of slag layer.Above three is added and is total thickness of slag layer.
(4) length that contrast under different technology conditions, rear iron wire is melted in each position and surperficial melting loss situation judge melt cinder thickness, molten steel slag and the molten steel surface flow field situation of each position.
Under contrast different technology conditions (5), the fusing time of each position iron wire, carry out the molten steel surface temperature situation under more each process conditions.
(6) the present invention passes through simple tool, crystallizer surface flow field of molten steel and covering slag situation under analysis and research different technology conditions, and then to Optimizing Process Parameters, improve end product quality and there is important directive function.
The method of this detection crystallizer protecting residue situation, it comprises following step successively:
detect a method for crystallizer protecting residue situation, it comprises following step successively:
ileptoprosopy position by one end of testing tool near crystallizer, described testing tool is made up of splat and iron wire, rectangular the long 600 ± 4mm of plate, wide 100 ± 2mm, thick 10mm; Iron wire length 110mm, diameter phi 1.5mm; Fix an iron wire every 100mm in the middle of the splat, fix continuously five, the length that is iron wire with the length of upper/lower positions iron wire at splat deducts the thickness of splat;
iIthen testing tool is lain in crystallizer, ensure that the iron wire in testing tool can touch the molten steel of covering slag below;
iIIin the time that submersed nozzle insertion depth is within the scope of 140 ± 1mm: testing tool stops 7～8s, testing tool is taken out stably, can be by the iron wire fusing of contact molten steel position; The liquid slag layer thickness of the first iron wire～five iron wire position covering slag measuring; And measure the thickness of total slag blanket;
iVin the time that submersed nozzle insertion depth is within the scope of 150 ± 1mm: change a testing tool, testing tool stops 11～13s, testing tool is taken out stably, can be by the iron wire fusing of contact molten steel position; Measure the liquid slag layer thickness of the first iron wire～five iron wire position covering slag; And measure the thickness of total slag blanket;
vin the time that submersed nozzle insertion depth is within the scope of 160 ± 1mm: change again a testing tool testing tool and stop 14～16s, testing tool is taken out stably, can be by the iron wire fusing of contact molten steel position; Measure the liquid slag layer thickness of the first iron wire～five iron wire position covering slag; And measure the thickness of total slag blanket.
The method of above-mentioned detection crystallizer protecting residue situation, is characterized in that: repeating step
i～step
voperation, repeat by 8～10 cumulative measurements, comprehensively weigh molten steel surface temperature and the Different Effects of liquid slag layer thickness to slab quality, finally determine the optimum depth of submersed nozzle.
Method of the present invention, according to different insertion depth values, was controlled the different residence time, at 7～16 seconds; Then, testing tool is taken out stably; By observation and comparison diverse location place iron wire melting loss degree, analyze the change slag situation of flow field of molten steel and covering slag.
The first iron wire of the present invention is from submersed nozzle iron wire farthest.
Beneficial effect of the present invention
Testing tool is simple, easy to use, can detect more intuitively crystallizer surface flow field of molten steel and covering slag fusing situation by observing the melting loss degree of iron wire, reliable theory is provided and has improved foundation for further producing high-quality strand.
Brief description of the drawings
Fig. 1 is the method schematic diagram of this detection crystallizer surface flow field of molten steel and covering slag situation.
Fig. 2 is the vertical view corresponding with Fig. 1.
in above-mentioned figure:
1. narrow face copper plate of crystallizer, 2. splat, 3. testing tool, 4. iron wire, the 5. slag layer of covering slag, the 6. sinter layer of covering slag, the 7. liquid slag layer of covering slag, 8. steel stream, 9. submersed nozzle, 10. flow field of molten steel, the leptoprosopy position of 11. crystallizers.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment and accompanying drawing thereof, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment
For the SUS304 steel grade sheet billet continuous casting condition of production of 200mm × 1500mm section, molten steel surface temperature and the liquid slag layer thickness actual conditions of same model submersed nozzle under different insertion depth process conditions are measured successively.Steel grade that measuring process is chosen is identical, section is identical, identical, the middle bag temperature of covering slag model is identical, the impact of the different insertion depth effects on surface of comparative analysis flow field of molten steel, surface temperature, covering slag melting conditions.
Detection (surperficial flow field of molten steel) instrument 3 of the present embodiment is shown in Fig. 1 and Fig. 2, and testing tool 3 is made up of iron wire 4 and splat 2, the long 600mm of splat 2, the thick 10mm of wide 100mm; Iron wire 4 length 110mm, diameter phi 1.5mm; In the middle of splat 2, fix an iron wire every 100mm, fix continuously 5, be 100mm at splat 2 with the length of upper/lower positions iron wire 4.
The detecting step of the present embodiment is:
Leptoprosopy position by one end of testing tool 3 near crystallizer 11, then lies in testing tool 3 in crystallizer 11, ensures that the iron wire 4 in testing tool 3 can touch the molten steel of covering slag below.According to different insertion depth values, control the different residence time, at 7～16 seconds.Then, testing tool 3 is taken out stably.By observation and comparison diverse location place iron wire 4 melting loss degree, see Fig. 1 and Fig. 2, analyze the change slag situation of flow field of molten steel 10 and covering slag:
In the time that submersed nozzle 9 mouth of a river insertion depths are within the scope of 140 ± 1mm: testing tool 3 stops 7～8s can be by the iron wire fusing of contact molten steel position; Liquid slag layer 7 thickness of the first iron wire～five iron wire (from left number) the position covering slag measuring are respectively: 11.8mm, 14.1mm, 13.2mm, 13.8mm, 14.2mm; Total slag blanket (slag layer 5 of covering slag and the thickness summation of the sinter layer 6 of covering slag and the liquid slag layer 7 of covering slag), thickness is followed successively by: 50.5mm, 53.5mm, 51.3mm, 52.5mm, 52.5mm.
In the time that submersed nozzle 9 insertion depths are within the scope of 150 ± 1mm: change a testing tool, testing tool stops 11～13s, contact molten steel position iron wire 4 can be melted, testing tool is taken out stably; Liquid slag layer 7 thickness that measure the first iron wire～five iron wire position covering slag are respectively: 12.3mm, 13.8mm, 12.6mm, 13.0mm, 13.4mm; Total thickness of slag layer is followed successively by: 51.5mm, 54.3mm, 52.7mm, 53.4mm, 53.8mm.
In the time that submersed nozzle 9 insertion depths are within the scope of 160 ± 1mm: change a testing tool, testing tool 3 need to stop 14～16s again, can, by the iron wire fusing of contact molten steel position, testing tool be taken out stably; Liquid slag layer 7 thickness of the first iron wire～five iron wire position covering slag measuring are respectively: 12.8mm, 13.6mm, 13.2mm, 12.6mm, 13.2mm; Total thickness of slag layer is followed successively by: 51.8mm, 54.5mm, 53.5mm, 54.3mm, 54.5mm.
Result is analyzed as follows:
Submersed nozzle 9 insertion depths are more shallow, and iron wire 4 fusing times are shorter, and surperficial molten steel temperature is higher;
Submersed nozzle 9 insertion depths are more shallow, and liquid slag layer 7 thickness of the covering slag of close narrow side copper plate of crystallizer position are thinner, illustrate that the molten steel flow velocity of this position is larger, and molten steel refluxes more serious to washing away of covering slag.
Observe from narrow side (left side figure) to submersed nozzle 9 directions; liquid slag layer 7 liquid slag layers of the covering slag of the first iron wire position are the thinnest; and the liquid slag layer 7 of the second iron wire guarded by location slag is the thickest; the liquid slag layer 7 of the second iron wire root to the three iron wire guarded by location slags significantly reduces, the increase gradually again of liquid slag layer 7 thickness of the 3rd iron wire to the five iron wire guarded by location slags.The enrichment that has the liquid slag layer 7 of covering slag in the 200 ± 50mm position apart from narrow face copper plate of crystallizer 1 is described, slag phenomenon the most easily occurs.
Submersed nozzle 9 insertion depths are more shallow, and liquid slag layer 7 thickness of the covering slag of the second iron wire position are thicker, illustrate that this position slag is more serious.
By 8 cumulative measurements, comprehensively weigh molten steel surface temperature and the Different Effects of liquid slag layer thickness to slab quality, finally determine that under these process conditions, submersed nozzle 9 insertion depths are defined as 150mm for best.
Claims (2)
1. detect a method for crystallizer protecting residue situation, it comprises following step successively:
ileptoprosopy position by one end of testing tool near crystallizer, described testing tool is made up of splat and iron wire, rectangular the long 600 ± 4mm of plate, wide 100 ± 2mm, thick 10mm; Iron wire length 110mm, diameter phi 1.5mm; Fix an iron wire every 100mm in the middle of the splat, fix continuously five, the length that is iron wire with the length of upper/lower positions iron wire at splat deducts the thickness of splat;
iIthen testing tool is lain in crystallizer, ensure that the iron wire in testing tool can touch the molten steel of covering slag below;
iIIin the time that submersed nozzle insertion depth is within the scope of 140 ± 1mm: testing tool stops 7～8s, testing tool is taken out stably, can be by the iron wire fusing of contact molten steel position; The liquid slag layer thickness of the first iron wire～five iron wire position covering slag measuring; And measure the thickness of total slag blanket;
iVin the time that submersed nozzle insertion depth is within the scope of 150 ± 1mm: change a testing tool, testing tool stops 11～13s, testing tool is taken out stably, can be by the iron wire fusing of contact molten steel position; Measure the liquid slag layer thickness of the first iron wire～five iron wire position covering slag; And measure the thickness of total slag blanket;
vin the time that submersed nozzle insertion depth is within the scope of 160 ± 1mm: change again a testing tool testing tool and stop 14～16s, testing tool is taken out stably, can be by the iron wire fusing of contact molten steel position; Measure the liquid slag layer thickness of the first iron wire～five iron wire position covering slag; And measure the thickness of total slag blanket.
2. the method for detection crystallizer protecting residue situation according to claim 1, is characterized in that: repeating step
i～step
voperation, repeat by 8～10 cumulative measurements, comprehensively weigh molten steel surface temperature and the Different Effects of liquid slag layer thickness to slab quality, finally determine the optimum depth of submersed nozzle.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109465413A (en) * | 2018-11-12 | 2019-03-15 | 莱芜钢铁集团银山型钢有限公司 | A kind of non-equilibrium casting beam blank mould covering slag distributing method of single-point |
| CN110116196A (en) * | 2019-05-27 | 2019-08-13 | 南京钢铁股份有限公司 | A kind of device of measurement vortex crystallizer submersed nozzle insertion depth |
| CN113084102A (en) * | 2021-04-15 | 2021-07-09 | 重庆大学 | Crystallizer protection slag liquid slag layer thickness testing device and method based on wettability |
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| CN201322613Y (en) * | 2008-12-23 | 2009-10-07 | 南京钢铁联合有限公司 | Slag blanket thickness measuring device for covering slag of continuous casting crystallizer |
| CN101612648A (en) * | 2008-06-25 | 2009-12-30 | 鞍钢股份有限公司 | A kind of device and method of measuring covering slag thickness and liquid level fluctuation of molten steel |
| CN202762982U (en) * | 2012-08-23 | 2013-03-06 | 北京科技大学 | Device capable of measuring wave shape of molten steel liquid level and thickness of slag powder liquid slag layer |
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Patent Citations (6)
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| US5622218A (en) * | 1995-05-15 | 1997-04-22 | Hylsa S.A. De C.V. | Method and apparatus for continuous casting of steel materials |
| CN1788883A (en) * | 2004-12-13 | 2006-06-21 | 宝钢集团上海梅山有限公司 | Detecting tool and method for crystallizer protective slag |
| CN101097133A (en) * | 2006-06-30 | 2008-01-02 | 宝山钢铁股份有限公司 | Method and apparatus for measuring protection slag thickness in continuous casting crystallizer in |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109465413A (en) * | 2018-11-12 | 2019-03-15 | 莱芜钢铁集团银山型钢有限公司 | A kind of non-equilibrium casting beam blank mould covering slag distributing method of single-point |
| CN110116196A (en) * | 2019-05-27 | 2019-08-13 | 南京钢铁股份有限公司 | A kind of device of measurement vortex crystallizer submersed nozzle insertion depth |
| CN113084102A (en) * | 2021-04-15 | 2021-07-09 | 重庆大学 | Crystallizer protection slag liquid slag layer thickness testing device and method based on wettability |
| CN113084102B (en) * | 2021-04-15 | 2022-07-01 | 重庆大学 | Crystallizer protection slag liquid slag layer thickness testing device and method based on wettability |
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Application publication date: 20140604 |