CN102744393A - Tundish flow control device for slab casting machine, preparation method thereof and slagging method using tundish flow control device - Google Patents
Tundish flow control device for slab casting machine, preparation method thereof and slagging method using tundish flow control device Download PDFInfo
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- CN102744393A CN102744393A CN2012102618705A CN201210261870A CN102744393A CN 102744393 A CN102744393 A CN 102744393A CN 2012102618705 A CN2012102618705 A CN 2012102618705A CN 201210261870 A CN201210261870 A CN 201210261870A CN 102744393 A CN102744393 A CN 102744393A
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Abstract
The invention relates to a tundish flow control device for a slab casting machine, a preparation method of the tundish flow control device and a slagging method using the tundish flow control device, and belongs to the technical field of the ferrous metallurgy slab casting tundish technology. The tundish flow control device for the slab casting machine comprises a turbulence controller, a slag blockage weir and a slag blockage dam, and is characterized in that the upper edge of the slag blockage weir (5) is higher than the highest liquid level (10) of molten steel normally poured by the tundish, but is lower than the working face of tundish overflow port coating (1); the slag blockage weir (5) and the slag blockage dam (6) are vertically staggered; two ends of the slag blockage dam (6) are respectively provided with a through hole; a center distance a between the slag blockage weir (5) and the turbulence controller (4) is 400-600mm; and a center distance b between the slag blockage weir (5) and the slag blockage dam (6) is 300-400mm. After the tundish flow control device for the slab casting machine is adopted, slab tundish injection residue can be reduced by more than 25%, the service life of the flow control device is improved by one time and is above 14 hours, and the production cost of continuous casting refractory material is lowered by more than 30%.
Description
Technical field
The present invention relates to a kind of slab caster tundish flow control device, its preparation method and utilize the method for its slagging, belong to Ferrous Metallurgy sheet billet continuous casting tundish technology field.
Background technology
In the slab caster tundish, flow control device is set,, prolongs the time of staying of molten steel in tundish, have the inclusion floating of promotion and get rid of, reduce the metallurgical function of strand inner inclusion, change inclusion morphology with change molten steel running route.Flow control device generally is made up of turbulence inhibitor, slag weir, dam.After in the slab caster tundish flow control device being set at present; Occur new technical problem again: (1) is provided with slag weir; Can not be the slag that floats in the tundish through regular the ejecting of tundish overfall, the time is watered by the company that can only shorten tundish, causes the continuous casting production cost to raise; (2) dam is set, after tundish stops watering, has stopped that the part molten steel flows out, it is surplus to have increased the tundish notes thus, has reduced the slab qualification rate; (3) flow control device not anti-erosion, wash away, service life is low, becomes the bottleneck problem that restriction improves the sheet billet continuous casting tundish life-span, causes the continuous casting production cost to raise.
CN101947643A is weir, an a kind of tundish dam flow control device, comprise put fore slag weir, be arranged on the pushing off the slag counter-dam at slag weir rear portion and be arranged on the pushing off the slag at pushing off the slag counter-dam rear portion after the dam; The bottom on the left surface of being shaped as of slag weir all is that the cross section of outer arcuate is trapezoidal hexahedron; The bottom on the upper bottom surface of being shaped as of pushing off the slag counter-dam all is that the cross section of arc lower is pentagonal heptahedron; The dam is shaped as cuboid after the pushing off the slag.The upper edge of slag weir is concordant with the bag edge of tundish in this invention, can not be the slag that floats in the tundish through regular the ejecting of tundish overfall, and the time is watered by the company that can only shorten tundish; Do not have through hole on the dam, after tundish stops watering, stopped that the part molten steel flows out, increased tundish thus and annotated surplus; Slag weir adopts existing production technology, and its opposing molten steel corrodes, performance of flushing is poor; Traditional impact pad (11) is adopted in the position, bag bottom that the molten steel beam impacts in the tundish; Turbulence inhibitor is not set; To prolong the time of staying of molten steel in tundish, the effect that promotes inclusion floating to get rid of weakens greatly, and impact pad opposing molten steel corrodes, performance of flushing is poor.
Summary of the invention
The objective of the invention is,, a kind of slab caster tundish flow control device and manufacturing approach are provided to the problem that occurs behind the flow control device is set in the slab caster tundish; Another object of the present invention provides a kind of slagging method of utilizing this slab caster tundish flow control device; Use the present invention can realize regular slagging; Reducing tundish on year-on-year basis annotates and surpluss more than 25%; Flow control device improves 1 times service life on year-on-year basis, reaches more than the 16h, reduces the continuous casting production cost of anti-the material on year-on-year basis more than 30%.
For realizing above-mentioned purpose, the technical scheme that the present invention adopts is:
A kind of slab caster tundish flow control device comprises turbulence inhibitor, slag weir, dam, and turbulence inhibitor is installed in the inboard of tundish beam impact zone bag wall working lining; Its center line and big central lines of wrapping long nozzle; Slag weir is fixed on the tundish bag wall working lining, and dam is fixed at the bottom of the tundish bag on the working lining, it is characterized in that; The upper edge of slag weir 5 is higher than the high liquid level (HLL) 10 of molten steel of the normal cast of tundish; But be lower than the working face of tundish overfall coating 1, slag weir 5 and dam interlaced arrangement about in the of 6, respectively there is a through hole at the two ends of dam 6; Slag weir 5 is 400～600mm with turbulence inhibitor 4 centre distance a; Dam 6 is 300～400mm with the centre distance b of slag weir 5; The working face of tundish overfall coating 1 and tundish bag are 120～160mm along 13 distance y.
Preferably, the upper edge of slag weir 5 be higher than the normal cast of tundish the high liquid level (HLL) 10 of molten steel be 20～50mm apart from n, and the upper edge of slag weir 5 is lower than tundish overfall coating 1 working face is 50～100mm apart from m.
Preferably, slag weir 5 is 100～200mm with the staggered up and down height x of dam 6.
Preferably; The position of the two ends through hole 7 of dam 6 is respectively at 1/4 place, dam two ends; Its diameter d is 50～100mm; The center line of its through hole is 30 °～50 ° with the center line angle β of vertical dam body, and the distance h of working lining 8 is 40～70mm at the bottom of the center line of through hole 7 and the tundish bag.
Preferably, turbulence inhibitor 4 comprises turbulence inhibitor shell 14, turbulence inhibitor cover core 15, turbulence inhibitor base 16 and coating coating 17.
Said turbulence inhibitor shell 14 adopts the pours moulding by casting, and its lateral wall is truncated cone-shaped, and madial wall is truncated cone-shaped.
Said turbulence inhibitor cover core 15 adopts the pours moulding by casting, and its lateral wall is truncated cone-shaped, and madial wall is cylindrical, and the intracavity diameter D of said turbulence inhibitor cover core 15 is 300～400mm.
Preferably, slag weir 5 adopts the pours moulding by casting, and thickness L is 120～160mm, respectively buries suspension ring 18 underground at the two ends, upper edge of slag weir.
Preferably, dam 6 adopts the pours moulding by casting, and thickness w is 150～200mm, respectively buries suspension ring 19 underground at the two ends, upper edge of dam.
The said pours that is used for turbulence inhibitor shell 14 is made up of following material: the alumine 25 ~ 28% of 8 ~ 5mm granularity, 3mm ≦ granularity by weight percentage<the alumine 10 ~ 14% of 5mm, 1mm ≦ granularity<the alumine 14 ~ 18% of 3mm, 0.083mm ≦ granularity<the alumine 12 ~ 16% of 1mm, the corundum fine powder 8.0 ~ 10% of Li Du ≦ 0.074mm, the highly-purity magnesite fine powder 8.0 ~ 10.0% of Li Du ≦ 0.074mm, the aluminum-spinel micro mist 4.5 ~ 5.5% of Li Du ≦ 0.047mm, the a-AI of Li Du ≦ 0.047mm
2O
3Micro mist 3.5 ~ 4.5%, silicon powder 0.5 ~ 1.5%, pure calcium aluminate cement 3.5 ~ 4.5%, sodium phosphate trimer 0.1 ~ 0.2%, explosion-proof fiber 0.05 ~ 0.1%.
Said alumine is one-level or special grade bauxite.Alumine is claimed bauxite again, and general main is to look its Al
2O
3The height of content comes classification, Al
2O
3＞75% is superfine, and 70-75%'s is one-level, and 60-70%'s is secondary, and 50-60%'s is three grades, and 45-55%'s is level Four.Its impurity F e
2O
3The general requirement less than 2.5% (except that superfine requires less than 2.0%), CaO is generally less than 0.6% (superfine requirement is less than 0.5%, and level Four is then only required and is lower than 0.7%).Refractoriness requires to be higher than 1770 ℃.In addition, also can carry out Primary Evaluation to the commercial grade with bauxite through light microscope, mainly be the relative amount of measuring diaspore.The main alumine of being made up of diaspore is superfine and one-level, is main with the diaspore, but contains the secondary that is of some clay minerals (like kaolinite); With kaolinite is main, and what contain a great deal of diaspore simultaneously is three grades.The specification requirement of high aluminas at different levels is known to those skilled in the art.
Said highly-purity magnesite is to select for use natural superfine giobertite flotation to purify to form MgO percentage composition>=97% (weight ratio), particle volume density>=3.30g/cm through light-burned, fine grinding, pressure ball, the calcining of superhigh temperature oil shaft furnace
3
Said corundum is brown corundum or alundum, and its physical and chemical index sees the following form:
The said pure calcium aluminate cement trade mark is CA-70.The trade mark is specific targets (following composition all by weight percentage): the Al as follows of the pure calcium aluminate cement of CA-70
2O
368.5-71.5%; CaO 26.5-30.5%; SiO
2≤0.5%; Fe
2O
3≤0.5%; Specific area (cm
2/ g)>=5000; Initial set setting time (min)>=150; Final set (h)≤6; 24h maintenance intensity (MPa) rupture strength (MPa)>=5, compression strength (MPa)>=40, refractoriness (℃) 1680.Examination criteria is GB201-2000.
Said refractory fibre is processed through modification by polypropylene fibre, length L=6mm, phasor diameter D=0.048mm, 165～175 ℃ of fusing points.Said explosion-proof fiber have good dispersion, no sintering, no doubling, residual less, characteristics such as result of use is good, be the excellent anti-explosion additives of various amorphous refractories, high-strength quick-acting amorphous refractory particularly.
Said silicon powder, wherein SiO
2Content>=92%, granularity is less than 5 μ m, and granularity accounts for 80～85% less than 2 μ m.Said silicon powder is commonly called as the silicon ash, is the byproduct of producing metallic silicon or Antaciron.
Preferably, the said pours that is used for turbulence inhibitor shell 14 is made up of following material: the alumine 28% of 8 ~ 5mm granularity, 3mm ≦ granularity by weight percentage<the alumine 10% of 5mm, 1mm ≦ granularity<the alumine 18% of 3mm, 0.083mm ≦ granularity<the alumine 12% of 1mm, the corundum fine powder 10% of Li Du ≦ 0.074mm, the highly-purity magnesite fine powder 10% of Li Du ≦ 0.074mm, the aluminum-spinel micro mist 4.5% of Li Du ≦ 0.047mm, the a-AI of Li Du ≦ 0.047mm
2O
3Micro mist 3.5%, silicon powder 0.5%, pure calcium aluminate cement 3.3%, sodium phosphate trimer 0.15%, explosion-proof fiber 0.05%.
The said pours that is used for turbulence inhibitor cover core 15, slag weir 5, dam 6 all is made up of following material: the highly-purity magnesite 24 ~ 28% of 8 ~ 5mm granularity, 3mm ≦ granularity < highly-purity magnesite 16 ~ 20% of 5mm granularity by weight percentage; 1mm ≦ granularity < highly-purity magnesite 12 ~ 18% of 3mm, 0.088mm ≦ granularity < fused magnesite 12 ~ 16% of 1mm, the fused magnesite fine powder 15 ~ 20% of Li Du ≦ 0.074mm; The aluminum-spinel micro mist 3.0 ~ 5.0% of silicon powder 2.0 ~ 3.0% Li Du ≦ 0.047mm, sodium phosphate trimer 0.2 ~ 0.5%, calgon 0.15 ~ 0.25%; Explosion-proof fiber 0.1 ~ 0.15%, heat-resistant steel fiber 0.35 ~ 0.5%.
Said fused magnesite is the one-level fused magnesite of MgO >=97%.
Said heat-resistant steel fiber is to produce with the heat resisting steel that contains alloying elements such as chromium nickel, the optional trade mark be 330,310,304,446 and 430 a kind of.
Preferably, be used for the pours of turbulence inhibitor cover core 15, slag weir 5, dam 6, be by weight percentage and form: the highly-purity magnesite 24% of 8 ~ 5mm granularity by following material; 3mm ≦ granularity < highly-purity magnesite 20% of 5mm granularity, 1mm ≦ granularity < highly-purity magnesite 18% of 3mm, 0.088mm ≦ granularity < the fused magnesite fine powder 15% of fused magnesite 16% Li Du ≦ 0.074mm of 1mm, silicon powder 3.0%, the aluminum-spinel micro mist 3.0% of Li Du ≦ 0.047mm; Sodium phosphate trimer 0.4%; Calgon 0.15%, explosion-proof fiber 0.1%, heat-resistant steel fiber 0.35%.
The present invention also provides the preparation method of turbulence inhibitor 4, may further comprise the steps:
1) turbulence inhibitor shell 14 preparations after the component material weighing with said turbulence inhibitor shell 14 pours, add to do in the batch mixer and mixed 2 ~ 3 minutes; The water that adds material gross weight 4.5～6.0%, loose tool is put in wet mixing 4 ~ 6 minutes behind the mixing; Use vibrating head jolt ramming, when no big bubble is emerged, the green compact casting complete of turbulence inhibitor shell 14; The band mould solidified natural curing 12～24 hours 12～24 hours; Warm firing process in adopting after the natural curing: 1. heat up, be warming up to 135 ± 15 ℃ from 0～135 ± 15 ℃ with 10 ℃/h programming rate; 2. at 135 ± 15 ℃ of insulations, temperature retention time 12h; 3. heat up from 135 ± 15 ℃ with 10 ℃/h programming rate again, be warming up to 275 ± 15 ℃; 4. at 275 ± 15 ℃ of insulations, temperature retention time 8h; 5. heat up from 275 ± 15 ℃ with 15 ℃/h programming rate again, be warming up to 435 ± 15 ℃; 6. at 435 ± 15 ℃ of insulations, temperature retention time 8h; 7. the nature of ceasing fire cooling, cool time 12～24h, turbulence inhibitor shell 14 completes.
2) turbulence inhibitor cover core 15 preparations after the said component material weighing that is used for turbulence inhibitor cover core 15 pours, add to do in the batch mixer and mixed 2 ~ 3 minutes; The water that adds material gross weight 5.5～6.0%, loose tool is put in wet mixing 4 ~ 6 minutes behind the mixing; Use vibrating head jolt ramming, when no big bubble is emerged, the green compact casting complete of turbulence inhibitor cover core 15; The band mould solidified 12～24 hours; Natural curing 12～24 hours, warm firing process in adopting after the natural curing: 1. heat up, be warming up to 135 ± 15 ℃ from 0～135 ± 15 ℃ with 10 ℃/h programming rate; 2. at 135 ± 15 ℃ of insulations, temperature retention time 12h; 3. heat up from 135 ± 15 ℃ with 10 ℃/h programming rate again, be warming up to 275 ± 15 ℃; 4. at 275 ± 15 ℃ of insulations, temperature retention time 8h; 5. heat up from 275 ± 15 ℃ with 15 ℃/h programming rate again, be warming up to 435 ± 15 ℃; 6. at 435 ± 15 ℃ of insulations, temperature retention time 8h; 7. the nature of ceasing fire cooling, cool time 12～24h, turbulence inhibitor cover core 15 completes.
3) turbulence inhibitor 4 assemblings; Bottom at turbulence inhibitor shell 14; At first adopt the aluminium-magnesia carbon brick of mechanical pressing to build turbulence inhibitor base 16 by laying bricks or stones, its thickness e is 100～120mm, and turbulence inhibitor cover core 15 is installed then; With the outer surface of fire-resistant coating at turbulence inhibitor base 16 and turbulence inhibitor cover core 15, coating thickness c is 15～25mm again.Adopt the filling of magnesite clinker powder, the tamping of 1～0.083mm between turbulence inhibitor shell 14 and the turbulence inhibitor cover core 15, obtain turbulence inhibitor 4.
Said aluminium-magnesia carbon brick, its MgO+Al
2O
3Content is 72～76%, and MgO content is 10～14%, and C content is 7～8%, and apparent porosity is 8～10%, and bulk density is 2.80～2.90g/cm
3, cold crushing strength is 40～55MPa, the 0.2MPa refractoriness under load is 1600～1670 ℃.
Described coating 17 is selected to the magnesia coating of tundish working lining, and its MgO content is 84～86%, SiO
2Content is 4～6%, and CaO content is 1～3%, Fe
2O
3, Al
2O
3Reaching other content is 5～12%, and bulk density is 1.9～2.1g/cm
3, compressive resistance (110 ℃ * 24h) be 3～6MPa, line rate of change-2～-4%.
The preparation method and the step of described slag weir 5, dam 6 are all identical with above-mentioned turbulence inhibitor cover core 15.
Through a large amount of tests; We find that when turbulence inhibitor shell 14, turbulence inhibitor cover core 15, slag weir 5, dam 6 prefabricated components, baking temperature has considerable influence to resistance to compression, the rupture strength of prefabricated component; Through overtesting, we have found best baking temperature and time control system.Turbulence inhibitor shell 14, the turbulence inhibitor made with warm firing process in of the present invention overlap core 15, slag weir 5, dam 6 prefabricated components; Can bear the high-temperature molten steel (1550～1650 ℃) more than 16 hours erosion, wash away, good corrosion resistance, scour resistance are arranged.
The present invention also provides a kind of slagging method of utilizing above-mentioned slab caster tundish flow control device, may further comprise the steps:
1) during the continuous casting ordinary production, the high liquid level (HLL) of molten steel that liquid steel level is controlled at the normal cast of tundish in the tundish is below 10, the upper edge of slag weir 5 be higher than the normal cast of tundish the high liquid level (HLL) 10 of molten steel be 20～50mm apart from n;
2) during the tundish slagging, the liquid steel level 11 when improving liquid steel level to tundish slagging in the tundish, making its distance z that is higher than the working face of tundish overfall coating 1 is 50～100mm, discharges the slag in the tundish through tundish overfall 2;
3) after the tundish slagging finished, the high liquid level (HLL) of molten steel that reduces the normal cast of liquid steel level to tundish in the tundish was below 10, make the upper edge of slag weir 5 be higher than the normal cast of tundish the high liquid level (HLL) 10 of molten steel be 20～50mm apart from n;
4) the every cast of continuous casting tundish is 6～8 hours, and slagging once repeats above-mentioned steps 2), 3).
The present invention has the following advantages:
1) the invention solves in the sheet billet continuous casting tundish slag weir, dam are set after, slagging regularly, tundish are annotated technical barriers such as surplus increase, reduce tundish on year-on-year basis and annotate and surplus more than 25%.
2) turbulence inhibitor of the present invention, slag weir, dam, improved to high-temperature molten steel anti-wash away, erosion-resisting characteristics, flow control device improves 1 times service life on year-on-year basis, reaches more than the 14h, reduces the continuous casting production cost of anti-the material on year-on-year basis more than 30%.
The present invention is successful Application on silver mountain shaped steel Co., Ltd of Laiwu iron and steel group steel mill single current Wide and Thick Slab billet continuous casting machine tundish; Effect is good: 1. the every cast of continuous casting tundish is 6～8 hours; Slagging once, average tundish is annotated and is surplusly reduced to 4 tons by 6 tons, reduces tundish on year-on-year basis and annotates and surplus 30%.2. flow control device is brought up to 14h by 7h average life, improves single Bao Lian on year-on-year basis and waters 1 times of time, reduces the continuous casting production cost of anti-material the 50% on year-on-year basis.
Description of drawings
Fig. 1 is a slab caster tundish flow control device structural representation of the present invention.
Fig. 2 is a turbulence inhibitor structural representation of the present invention.
Fig. 3 is a slag weir structural representation of the present invention.Wherein A is the slag weir front view, and B is the slag weir left view.
Fig. 4 is a dam structural representation of the present invention.Wherein A is the dam front view, and B is the dam left view.
Wherein, 1-overfall coating, 2-tundish overfall, the big bag long nozzle of 3-; The 4-turbulence inhibitor, 5-slag weir, 6-dam, 7-through hole; 8-tundish working lining, 9-tundish permanent liner, the high liquid level (HLL) of the molten steel of the normal cast of 10-tundish, the liquid steel level the during slagging of 11-tundish; The 12-basket pouring mouth of a river, 13-tundish bag edge, 14-turbulence inhibitor shell, 15-turbulence inhibitor cover core; 16-turbulence inhibitor base, 17-smears the bed of material, the suspension ring on the 18-slag weir, the suspension ring on the 19-dam.
The specific embodiment
Following examples are that the preparation technology who invents is further specified, but the present invention is not limited thereto.
Embodiment 1:
Like Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, a kind of slab caster tundish flow control device comprises turbulence inhibitor 4, slag weir, dam; Turbulence inhibitor is installed in the inboard of tundish beam impact zone bag wall working lining; The central lines of its center line and big bag long nozzle, slag weir is fixed on the tundish bag wall working lining, and dam is fixed at the bottom of the tundish bag on the working lining; The upper edge of slag weir 5 be higher than the normal cast of tundish the high liquid level (HLL) 10 of molten steel be 50mm apart from n; And what the upper edge of slag weir 5 was lower than tundish overfall coating 1 working face is 50mm apart from m, slag weir 5 and dam about in the of 6 interlaced arrangement height x be 100mm, respectively there is a through hole at the two ends of dam 6; The position of the two ends through hole of dam 6 is at dam 1/4 place; Its diameter d is 100mm, and its centerline hole is 30 ° with the center line angle β of vertical dam body, and the distance h of working lining 8 is 70mm at the bottom of through hole 7 center lines and the tundish bag; Slag weir 5 is 600mm with turbulence inhibitor 4 centre distance a; Dam 6 is 400mm with the centre distance b of slag weir 5; The working face of tundish overfall coating 1 and tundish bag are 160mm along 13 distance y.
Said turbulence inhibitor 4 comprises turbulence inhibitor shell 14, turbulence inhibitor cover core 15, turbulence inhibitor base 16 and coating coating 17.
Said turbulence inhibitor shell 14 adopts the pours moulding by casting, and its lateral wall is truncated cone-shaped, and madial wall is truncated cone-shaped.
Said turbulence inhibitor cover core 15 adopts the pours moulding by casting, and its lateral wall is truncated cone-shaped, and madial wall is cylindrical, and the intracavity diameter D of said turbulence inhibitor cover core 15 is 300mm.
Said slag weir 5 adopts the pours moulding by casting, is trapezium structure, and thickness L is 120mm, respectively buries suspension ring 18 underground at the two ends, upper edge of slag weir.
Said dam 6 adopts the pours moulding by casting, is trapezium structure, and thickness w is 150mm, respectively buries suspension ring 19 underground at the two ends, upper edge of dam.
The said pours that is used for turbulence inhibitor shell 14 is made up of following material: the alumine 28% of 8 ~ 5mm granularity, 3mm ≦ granularity by weight percentage<the alumine 10% of 5mm, 1mm ≦ granularity<the alumine 18% of 3mm, 0.083mm ≦ granularity<the alumine 12% of 1mm, the corundum fine powder 10% of Li Du ≦ 0.074mm, the highly-purity magnesite fine powder 10% of Li Du ≦ 0.074mm, the aluminum-spinel micro mist 4.5% of Li Du ≦ 0.047mm, the a-AI of Li Du ≦ 0.047mm
2O
3Micro mist 3.5%, silicon powder 0.5%, pure calcium aluminate cement 3.3%, sodium phosphate trimer 0.15%, explosion-proof fiber 0.05%.
Said alumine is a special grade bauxite.Said corundum is an alundum.
The said pours that is used for turbulence inhibitor cover core 15, slag weir 5, dam 6 is by weight percentage and is made up of following material: the highly-purity magnesite 24% of 8 ~ 5mm granularity, 3mm ≦ granularity < highly-purity magnesite 20% of 5mm granularity; 1mm ≦ granularity < highly-purity magnesite 18% of 3mm, 0.088mm ≦ granularity < fused magnesite 16% of 1mm, the fused magnesite fine powder 15% of Li Du ≦ 0.074mm; The aluminum-spinel micro mist 3.0% of silicon powder 3.0% Li Du ≦ 0.047mm, sodium phosphate trimer 0.4%, calgon 0.15%; Explosion-proof fiber 0.1%, heat-resistant steel fiber 0.35%.
Said fused magnesite is the one-level fused magnesite of MgO >=97%.Said heat-resistant steel fiber, selecting the trade mark is 330.
A kind of preparation method like embodiment 1 said turbulence inhibitor 4 may further comprise the steps:
1) turbulence inhibitor shell 14 preparations after the component material weighing with said turbulence inhibitor shell 14 pours, add to do in the batch mixer and mixed 2 minutes; The water that adds material gross weight 4.5%, loose tool is put in wet mixing 6 minutes behind the mixing; Use vibrating head jolt ramming, when no big bubble is emerged, the green compact casting complete of turbulence inhibitor shell 14; The band mould solidified natural curing 24 hours 12 hours; Warm firing process in adopting after the natural curing: 1. heat up, be warming up to 135 ± 15 ℃ from 0～135 ± 15 ℃ with 10 ℃/h programming rate; 2. at 135 ± 15 ℃ of insulations, temperature retention time 12h; 3. heat up from 135 ± 15 ℃ with 10 ℃/h programming rate again, be warming up to 275 ± 15 ℃; 4. at 275 ± 15 ℃ of insulations, temperature retention time 8h; 5. heat up from 275 ± 15 ℃ with 15 ℃/h programming rate again, be warming up to 435 ± 15 ℃; 6. at 435 ± 15 ℃ of insulations, temperature retention time 8h; 7. the nature of ceasing fire cooling, cool time 12h, turbulence inhibitor shell 14 completes.
2) turbulence inhibitor cover core 15 preparations after the said component material weighing that is used for turbulence inhibitor cover core 15 pours, add to do in the batch mixer and mixed 2 minutes; The water that adds material gross weight 5.5%, loose tool is put in wet mixing 4 minutes behind the mixing; Use vibrating head jolt ramming, when no big bubble is emerged, the green compact casting complete of turbulence inhibitor cover core 15; The band mould solidified 12 hours; Natural curing 12 hours, warm firing process in adopting after the natural curing: 1. heat up, be warming up to 135 ± 15 ℃ from 0～135 ± 15 ℃ with 10 ℃/h programming rate; 2. at 135 ± 15 ℃ of insulations, temperature retention time 12h; 3. heat up from 135 ± 15 ℃ with 10 ℃/h programming rate again, be warming up to 275 ± 15 ℃; 4. at 275 ± 15 ℃ of insulations, temperature retention time 8h; 5. heat up from 275 ± 15 ℃ with 15 ℃/h programming rate again, be warming up to 435 ± 15 ℃; 6. at 435 ± 15 ℃ of insulations, temperature retention time 8h; 7. the nature of ceasing fire cooling, cool time 12h, turbulence inhibitor cover core 15 completes.
3) turbulence inhibitor 4 assemblings; Bottom at turbulence inhibitor shell 14; At first adopt the aluminium-magnesia carbon brick of mechanical pressing to build turbulence inhibitor base 16 by laying bricks or stones, adopt side block method, aluminium magnesia carbon brick specification (long * wide * thick) 230 * 115 * 65 (mm of unit); Said turbulence inhibitor base 16 thickness e are 115mm; Turbulence inhibitor cover core 15 is installed then, and with the outer surface of fire-resistant coating at turbulence inhibitor base 16 and turbulence inhibitor cover core (15), coating thickness c is 15mm again.Adopt the filling of magnesite clinker powder, the tamping of 1～0.083mm between turbulence inhibitor shell 14 and the turbulence inhibitor cover core 15, obtain turbulence inhibitor 4.
Said aluminium-magnesia carbon brick, selecting the trade mark for use is the aluminium-magnesia carbon brick of LMT-72, its MgO+Al
2O
3Content is 72%, and MgO content is 10%, and C content is 7%, and apparent porosity is 10%, and bulk density is 2.80g/cm3, and cold crushing strength is 40MPa, and the 0.2MPa refractoriness under load is 1600 ℃.
Described coating 17 is selected to the magnesia coating of tundish working lining, and its MgO content is 86%, SiO
2Content is 4%, and CaO content is 2%, Fe
2O
3, Al
2O
3Reaching other content is 8%, and bulk density is 2.1g/cm
3, compressive resistance (110 ℃ * 24h) be 6MPa, line rate of change-2%.
The preparation method and the step of described slag weir 5, dam 6 are all identical with above-mentioned turbulence inhibitor cover core 15.
A kind of slagging method of utilizing like embodiment 1 said slab caster tundish flow control device may further comprise the steps:
1) during the continuous casting ordinary production, the high liquid level (HLL) of molten steel that liquid steel level is controlled at the normal cast of tundish in the tundish is below 10, the upper edge of slag weir 5 be higher than the normal cast of tundish the high liquid level (HLL) 10 of molten steel be 50mm apart from n;
2) during the tundish slagging, the liquid steel level 11 when improving liquid steel level to tundish slagging in the tundish, making its distance z that is higher than the working face of tundish overfall coating 1 is 50mm, discharges the slag in the tundish through tundish overfall 2;
3) after the tundish slagging finished, the high liquid level (HLL) of molten steel that reduces the normal cast of liquid steel level to tundish in the tundish was below 10, make the upper edge of slag weir 5 be higher than the normal cast of tundish the high liquid level (HLL) 10 of molten steel be 50mm apart from n;
4) the every cast of continuous casting tundish is 6～8 hours, and slagging once repeats above-mentioned steps 2), 3).
Other is with embodiment 1, and difference is:
The upper edge of slag weir 5 be higher than the normal cast of tundish the high liquid level (HLL) 10 of molten steel be 20mm apart from n, and the upper edge of slag weir 5 is lower than tundish overfall coating 1 working face is 100mm apart from m.Slag weir 5 is 200mm with the staggered up and down height x of dam 6.
The two ends through hole 7 of dam 6, its diameter d are 100mm, and its centerline hole is 45 ° with the center line angle β of vertical dam body, and the distance h of working lining 8 is 70mm at the bottom of through hole 7 center lines and the tundish bag.
Said turbulence inhibitor cover core 15, its intracavity diameter D is 400mm.
Said slag weir 5 thickness L are 160mm.
Said dam 6 thickness w are 200mm.
The said prefabricated component pours that is used for turbulence inhibitor shell 14 is made up of following material: the alumine 25% of 8 ~ 5mm granularity, 3mm ≦ granularity by weight percentage<the alumine 13% of 5mm, 1mm ≦ granularity<the alumine 14% of 3mm, 0.083mm ≦ granularity<the alumine 16% of 1mm, the alundum fine powder 8.0% of Li Du ≦ 0.074mm, the highly-purity magnesite fine powder 8.0% of Li Du ≦ 0.074mm, the aluminum-spinel micro mist 5.5% of Li Du ≦ 0.047mm, the a-AI of Li Du ≦ 0.047mm
2O
3Micro mist 4.5%, silicon powder 1.5%, pure calcium aluminate cement 4.2%, sodium phosphate trimer 0.2%, explosion-proof fiber 0.1%.
Said alumine is the one-level alumine.Said corundum is brown corundum.
The said prefabricated component pours that is used for turbulence inhibitor cover core 15, slag weir 5, dam 6 is by weight percentage and is made up of following material: the highly-purity magnesite 28% of 8 ~ 5mm granularity, 3mm ≦ granularity < highly-purity magnesite 16% of 5mm granularity; 1mm ≦ granularity < highly-purity magnesite 12% of 3mm, 0.088mm ≦ granularity < fused magnesite 16% of 1mm, the fused magnesite fine powder 20% of Li Du ≦ 0.074mm; The aluminum-spinel micro mist 4.9% of silicon powder 2.0% Li Du ≦ 0.047mm, sodium phosphate trimer 0.2%, calgon 0.25%; Explosion-proof fiber 0.15%, heat-resistant steel fiber 0.5%.
Said heat-resistant steel fiber, selecting the trade mark is 310.
Preparation method like embodiment 4 said turbulence inhibitors 4 may further comprise the steps:
1) turbulence inhibitor shell 14 preparations after the component material weighing with said turbulence inhibitor shell 14 pours, add to do in the batch mixer and mixed 3 minutes; The water that adds material gross weight 6.0%, loose tool is put in wet mixing 6 minutes behind the mixing; Use vibrating head jolt ramming, when no big bubble is emerged, the green compact casting complete of turbulence inhibitor shell 14; The band mould solidified natural curing 12 hours 24 hours; Warm firing process in adopting after the natural curing: 1. heat up, be warming up to 135 ± 15 ℃ from 0～135 ± 15 ℃ with 10 ℃/h programming rate; 2. at 135 ± 15 ℃ of insulations, temperature retention time 12h; 3. heat up from 135 ± 15 ℃ with 10 ℃/h programming rate again, be warming up to 275 ± 15 ℃; 4. at 275 ± 15 ℃ of insulations, temperature retention time 8h; 5. heat up from 275 ± 15 ℃ with 15 ℃/h programming rate again, be warming up to 435 ± 15 ℃; 6. at 435 ± 15 ℃ of insulations, temperature retention time 8h; 7. the nature of ceasing fire cooling, cool time 24h, turbulence inhibitor shell 14 completes.
2) turbulence inhibitor cover core 15 preparations after the said component material weighing that is used for turbulence inhibitor cover core 15 pours, add to do in the batch mixer and mixed 3 minutes; The water that adds material gross weight 6.0%, loose tool is put in wet mixing 6 minutes behind the mixing; Use vibrating head jolt ramming, when no big bubble is emerged, the green compact casting complete of turbulence inhibitor cover core 15; The band mould solidified 24 hours; Natural curing 12 hours, warm firing process in adopting after the natural curing: 1. heat up, be warming up to 135 ± 15 ℃ from 0～135 ± 15 ℃ with 10 ℃/h programming rate; 2. at 135 ± 15 ℃ of insulations, temperature retention time 12h; 3. heat up from 135 ± 15 ℃ with 10 ℃/h programming rate again, be warming up to 275 ± 15 ℃; 4. at 275 ± 15 ℃ of insulations, temperature retention time 8h; 5. heat up from 275 ± 15 ℃ with 15 ℃/h programming rate again, be warming up to 435 ± 15 ℃; 6. at 435 ± 15 ℃ of insulations, temperature retention time 8h; 7. the nature of ceasing fire cooling, cool time 24h, turbulence inhibitor cover core 15 completes.
3) turbulence inhibitor 4 assemblings in the bottom of turbulence inhibitor shell 14, at first adopt the aluminium-magnesia carbon brick of mechanical pressing to build turbulence inhibitor base 16 by laying bricks or stones; Aluminium-magnesia carbon brick adopts flat block method; Aluminium magnesia carbon brick specification (long * wide * thick) 300 * 150 * 100 (mm of unit), its thickness e is 100mm, and turbulence inhibitor cover core 15 is installed then; With the outer surface of magnesia coating at turbulence inhibitor base 16 and turbulence inhibitor cover core 15, magnesia coating thickness c is 25mm again.Adopt the filling of magnesite clinker powder, the tamping of 1～0.083mm between turbulence inhibitor shell 14 and the turbulence inhibitor cover core 15, obtain turbulence inhibitor 4.
Said aluminium-magnesia carbon brick, selecting the trade mark for use is the aluminium-magnesia carbon brick of LMT-76, its MgO+Al
2O
3Content is 76%, and MgO content is 14%, and C content is 8%, and apparent porosity is 8%, and bulk density is 2.90g/cm3, and cold crushing strength is 55MPa, and the 0.2MPa refractoriness under load is 1670 ℃.
Described coating 17 is selected to the magnesia coating of tundish working lining, and its MgO content is 84%, SiO
2Content is 6%, and CaO content is 3%, Fe
2O
3, Al
2O
3Reaching other content is 7%, and bulk density is 1.9g/cm
3, compressive resistance (110 ℃ * 24h) be 3MPa, line rate of change-4%.
The preparation method and the step of described slag weir 5, dam 6 are all identical with above-mentioned turbulence inhibitor cover core 15.
A kind of slagging method of flow control device being installed like embodiment 4 said slab caster tundish may further comprise the steps:
1) during the continuous casting ordinary production, the high liquid level (HLL) of molten steel that liquid steel level is controlled at the normal cast of tundish in the tundish is below 10, the upper edge of slag weir 5 be higher than the normal cast of tundish the high liquid level (HLL) 10 of molten steel be 20mm apart from n;
2) during the tundish slagging, the liquid steel level 11 when improving liquid steel level to tundish slagging in the tundish, making its distance z that is higher than the working face of tundish overfall coating 1 is 100mm, discharges the slag in the tundish through tundish overfall 2;
3) after the tundish slagging finished, the high liquid level (HLL) of molten steel that reduces the normal cast of liquid steel level to tundish in the tundish was below 10, make the upper edge of slag weir 5 be higher than the normal cast of tundish the high liquid level (HLL) 10 of molten steel be 20mm apart from n;
4) the every cast of continuous casting tundish is 6～8 hours, and slagging once repeats above-mentioned steps 2), 3).
Claims (10)
1. a slab caster tundish flow control device comprises turbulence inhibitor, slag weir, dam, and turbulence inhibitor is installed in the inboard of tundish beam impact zone bag wall working lining; Its center line and big central lines of wrapping long nozzle; Slag weir is fixed on the tundish bag wall working lining, and dam is fixed at the bottom of the tundish bag on the working lining, it is characterized in that; The upper edge of slag weir (5) is higher than the high liquid level (HLL) (10) of molten steel of the normal cast of tundish; But be lower than the working face of tundish overfall coating (1), slag weir (5) and dam (6) be interlaced arrangement up and down, and respectively there is a through hole at the two ends of dam (6); Slag weir (5) is 400～600mm with turbulence inhibitor (4) centre distance a; Dam (6) is 300～400mm with the centre distance b of slag weir (5); The working face of tundish overfall coating (1) and tundish bag are 120～160mm along the distance y of (13); The position of the two ends through hole (7) of dam (6) is respectively at 1/4 place, dam two ends, and its diameter d is 50～100mm, and the center line of its through hole is 30 °～50 ° with the center line angle β of vertical dam body.
2. a kind of slab caster tundish flow control device according to claim 1; It is characterized in that; The upper edge of said slag weir (5) be higher than the normal cast of tundish the high liquid level (HLL) (10) of molten steel be 20～50mm apart from n, and the upper edge of slag weir (5) is lower than tundish overfall coating (1) working face is 50～100mm apart from m; Slag weir (5) is 100～200mm with the staggered up and down height x of dam (6); The distance h of working lining (8) is 40～70mm at the bottom of the center line of said through hole (7) and the tundish bag.
3. a kind of slab caster tundish flow control device according to claim 1; It is characterized in that said turbulence inhibitor (4) comprises turbulence inhibitor shell (14), turbulence inhibitor cover core (15), turbulence inhibitor base (16) and coating coating (17); Preferably, said turbulence inhibitor shell (14) adopts the pours moulding by casting, and its lateral wall is truncated cone-shaped, and madial wall is truncated cone-shaped; Said turbulence inhibitor cover core (15) adopts the pours moulding by casting, and its lateral wall is truncated cone-shaped, and madial wall is cylindrical, and the intracavity diameter D of said turbulence inhibitor cover core (15) is 300～400mm.
4. a kind of slab caster tundish flow control device according to claim 2 is characterized in that, slag weir (5) adopts the pours moulding by casting, and thickness L is 120～160mm, respectively buries suspension ring (18) underground at the two ends, upper edge of slag weir; Dam (6) adopts the pours moulding by casting, and thickness w is 150～200mm, respectively buries suspension ring (19) underground at the two ends, upper edge of dam.
5. a kind of slab caster tundish flow control device according to claim 3; It is characterized in that; The said pours that is used for turbulence inhibitor shell (14) is made up of following material: the alumine 25 ~ 28% of 8 ~ 5mm granularity, 3mm ≦ granularity by weight percentage<the alumine 10 ~ 14% of 5mm, 1mm ≦ granularity<the alumine 14 ~ 18% of 3mm, 0.083mm ≦ granularity<the alumine 12 ~ 16% of 1mm, the corundum fine powder 8.0 ~ 10% of Li Du ≦ 0.074mm, the highly-purity magnesite fine powder 8.0 ~ 10.0% of Li Du ≦ 0.074mm, the aluminum-spinel micro mist 4.5 ~ 5.5% of Li Du ≦ 0.047mm, the a-AI of Li Du ≦ 0.047mm
2O
3Micro mist 3.5 ~ 4.5%, silicon powder 0.5 ~ 1.5%, pure calcium aluminate cement 3.5 ~ 4.5%, sodium phosphate trimer 0.1 ~ 0.2%, explosion-proof fiber 0.05 ~ 0.1%.
6. a kind of slab caster tundish flow control device according to claim 5 is characterized in that the said pours that is used for turbulence inhibitor shell (14) is made up of following material by weight percentage: the alumine 28% of 8 ~ 5mm granularity, 3mm ≦ granularity<the alumine 10% of 5mm, 1mm ≦ granularity<the alumine 18% of 3mm, 0.083mm ≦ granularity<the alumine 12% of 1mm, the corundum fine powder 10% of Li Du ≦ 0.074mm, the highly-purity magnesite fine powder 10% of Li Du ≦ 0.074mm, the aluminum-spinel micro mist 4.5% of Li Du ≦ 0.047mm, the a-AI of Li Du ≦ 0.047mm
2O
3Micro mist 3.5%, silicon powder 0.5%, pure calcium aluminate cement 3.3%, sodium phosphate trimer 0.15%, explosion-proof fiber 0.05%; Said alumine is one-level or special grade bauxite.
7. a kind of slab caster tundish flow control device according to claim 3 is characterized in that, the said pours that is used for turbulence inhibitor cover core (15), slag weir (5), dam (6); All form by following material by weight percentage: the highly-purity magnesite 24 ~ 28% of 8 ~ 5mm granularity, 3mm ≦ granularity < highly-purity magnesite 16 ~ 20% of 5mm granularity, 1mm ≦ granularity < highly-purity magnesite 12 ~ 18% of 3mm; 0.088mm ≦ granularity < the fused magnesite fine powder 15 ~ 20% of fused magnesite 12 ~ 16% Li Du ≦ 0.074mm of 1mm, silicon powder 2.0 ~ 3.0%, the aluminum-spinel micro mist 3.0 ~ 5.0% of Li Du ≦ 0.047mm; Sodium phosphate trimer 0.2 ~ 0.5%; Calgon 0.15 ~ 0.25%, explosion-proof fiber 0.1 ~ 0.15%, heat-resistant steel fiber 0.35 ~ 0.5%.
8. a kind of slab caster tundish flow control device according to claim 7 is characterized in that, is used for the pours of turbulence inhibitor cover core (15), slag weir (5), dam (6); Be by weight percentage and form: the highly-purity magnesite 24% of 8 ~ 5mm granularity, 3mm ≦ granularity<highly-purity magnesite 20% of 5mm granularity, 1mm ≦ granularity<highly-purity magnesite 18% of 3mm by following material; 0.088mm ≦ granularity<the fused magnesite fine powder 15% of fused magnesite 16% Li Du ≦ 0.074mm of 1mm, silicon powder 3.0%, the aluminum-spinel micro mist 3.0% of Li Du ≦ 0.047mm; Sodium phosphate trimer 0.4%; Calgon 0.15%, explosion-proof fiber 0.1%, heat-resistant steel fiber 0.35%; Said fused magnesite is the one-level fused magnesite of MgO>=97%.
9. the preparation method of turbulence inhibitor (4) in a kind of slab caster tundish flow control device as claimed in claim 3 is characterized in that, may further comprise the steps:
1) turbulence inhibitor shell (14) preparation after the component material weighing with said turbulence inhibitor shell (14) pours, adds to do in the batch mixer and mixed 2 ~ 3 minutes; The water that adds material gross weight 4.5～6.0%, loose tool is put in wet mixing 4 ~ 6 minutes behind the mixing; Use vibrating head jolt ramming, when no big bubble is emerged, the green compact casting complete of turbulence inhibitor shell (14); The band mould solidified natural curing 12～24 hours 12～24 hours; Warm firing process in adopting after the natural curing: 1. heat up, be warming up to 135 ± 15 ℃ from 0～135 ± 15 ℃ with 10 ℃/h programming rate; 2. at 135 ± 15 ℃ of insulations, temperature retention time 12h; 3. heat up from 135 ± 15 ℃ with 10 ℃/h programming rate again, be warming up to 275 ± 15 ℃; 4. at 275 ± 15 ℃ of insulations, temperature retention time 8h; 5. heat up from 275 ± 15 ℃ with 15 ℃/h programming rate again, be warming up to 435 ± 15 ℃; 6. at 435 ± 15 ℃ of insulations, temperature retention time 8h; 7. the nature of ceasing fire cooling, cool time 12～24h, turbulence inhibitor shell (14) completes;
2) turbulence inhibitor cover core (15) preparation, will saidly be used for the component material weighing of turbulence inhibitor cover core (15) pours after, add and did in the batch mixer mixed 2 ~ 3 minutes; The water that adds material gross weight 5.5～6.0%, loose tool is put in wet mixing 4 ~ 6 minutes behind the mixing; Use vibrating head jolt ramming, when no big bubble is emerged, the green compact casting complete of turbulence inhibitor cover core (15); The band mould solidified 12～24 hours; Natural curing 12～24 hours, warm firing process in adopting after the natural curing: 1. heat up, be warming up to 135 ± 15 ℃ from 0～135 ± 15 ℃ with 10 ℃/h programming rate; 2. at 135 ± 15 ℃ of insulations, temperature retention time 12h; 3. heat up from 135 ± 15 ℃ with 10 ℃/h programming rate again, be warming up to 275 ± 15 ℃; 4. at 275 ± 15 ℃ of insulations, temperature retention time 8h; 5. heat up from 275 ± 15 ℃ with 15 ℃/h programming rate again, be warming up to 435 ± 15 ℃; 6. at 435 ± 15 ℃ of insulations, temperature retention time 8h; 7. the nature of ceasing fire cooling, cool time 12～24h, turbulence inhibitor cover core (15) completes;
3) turbulence inhibitor (4) assembling; Bottom in turbulence inhibitor shell (14); At first adopt the aluminium-magnesia carbon brick of mechanical pressing to build turbulence inhibitor base (16) by laying bricks or stones, its thickness e is 100～120mm, and turbulence inhibitor cover core (15) is installed then; Use the outer surface of fire-resistant coating at turbulence inhibitor base (16) and turbulence inhibitor cover core (15) again, coating thickness c is 15～25mm.Adopt the filling of magnesite clinker powder, the tamping of 1～0.083mm between turbulence inhibitor shell (14) and the turbulence inhibitor cover core (15), obtain turbulence inhibitor (4).
10. one kind is utilized the slagging method of slab caster tundish flow control device according to claim 1, it is characterized in that, may further comprise the steps:
1) during the continuous casting ordinary production, it is below the high liquid level (HLL) (10) that liquid steel level is controlled at the molten steel of the normal cast of tundish in the tundish, the upper edge of slag weir (5) be higher than the normal cast of tundish the high liquid level (HLL) (10) of molten steel be 20～50mm apart from n;
2) during the tundish slagging; Liquid steel level (11) when improving liquid steel level to tundish slagging in the tundish; Making its distance z that is higher than the working face of tundish overfall coating (1) is 50～100mm, discharges the slag in the tundish through tundish overfall (2);
3) after the tundish slagging finished, the molten steel that reduces the normal cast of liquid steel level to tundish in the tundish was below the high liquid level (HLL) (10), make the upper edge of slag weir (5) be higher than the normal cast of tundish the high liquid level (HLL) (10) of molten steel be 20～50mm apart from n;
4) the every cast of continuous casting tundish is 6～8 hours, and slagging once repeats above-mentioned steps 2), 3).
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| CN107745099A (en) * | 2017-09-19 | 2018-03-02 | 辽宁科技大学 | A kind of method for improving continuous casting steel recovery rate |
| US11154925B2 (en) * | 2017-12-21 | 2021-10-26 | Vesuvius U S A Corporation | Configured tundish |
| KR20200097707A (en) * | 2017-12-21 | 2020-08-19 | 베수비우스 유에스에이 코포레이션 | Configured tundish |
| JP2021509863A (en) * | 2017-12-21 | 2021-04-08 | ベスビウス ユーエスエー コーポレイション | Tandish |
| EP3727724A4 (en) * | 2017-12-21 | 2021-08-25 | Vesuvius USA Corporation | Configured tundish |
| CN109940157A (en) * | 2017-12-21 | 2019-06-28 | 维苏威美国公司 | Tundish with construction |
| JP7269937B2 (en) | 2017-12-21 | 2023-05-09 | ベスビウス ユーエスエー コーポレイション | tundish |
| KR102578511B1 (en) * | 2017-12-21 | 2023-09-13 | 베수비우스 유에스에이 코포레이션 | Constructed tundish |
| CN110614350A (en) * | 2019-10-11 | 2019-12-27 | 马鞍山钢铁股份有限公司 | Method for reducing casting residue of tundish of 2-machine 2-flow slab continuous casting machine |
| CN111113638A (en) * | 2020-01-20 | 2020-05-08 | 莱芜钢铁集团银山型钢有限公司 | Preparation method of low-cost long-service-life slab continuous casting tundish turbulator |
| CN112692270A (en) * | 2020-11-25 | 2021-04-23 | 鞍钢集团北京研究院有限公司 | Tundish device |
| CN112692270B (en) * | 2020-11-25 | 2022-06-10 | 鞍钢集团北京研究院有限公司 | Tundish device |
| CN112453376A (en) * | 2020-11-26 | 2021-03-09 | 莱芜钢铁集团银山型钢有限公司 | Embedded continuous casting tundish slag dam and installation method thereof |
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| CN102744393B (en) | 2014-04-30 |
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