CN103862013B - A kind of refining cover for continuous casting production and preparation method thereof - Google Patents
A kind of refining cover for continuous casting production and preparation method thereof Download PDFInfo
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- CN103862013B CN103862013B CN201410113939.9A CN201410113939A CN103862013B CN 103862013 B CN103862013 B CN 103862013B CN 201410113939 A CN201410113939 A CN 201410113939A CN 103862013 B CN103862013 B CN 103862013B
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Abstract
The present invention relates to a kind of refining cover for continuous casting production and preparation method thereof, comprise outer arc plate, inner arc plate and impregnating cover, circulation seam is provided with between outer arc plate and inner arc plate, circulation seam is communicated with the space between Slag Layer in tundish cover and tundish, impregnating cover is provided with the steam vent running through impregnating cover, inner arc plate is provided with the through hole relative with steam vent, steam vent to be stitched with circulation by through hole and is communicated with, air curtain air brick is blown into argon gas, the air curtain barrier that continuous closeness is large is formed between air curtain air brick and impregnating cover, catch field trash, by Slag Layer Adsorption, the Slag Layer that argon gas breaks through below impregnating cover continues up, through steam vent, through hole enters circulation seam, argon gas enters above tundish Slag Layer through circulation seam, space in tundish between Slag Layer and tundish cover forms argon gas-sealed.The secondary oxidation of molten steel is reduced in protection slag face, makes four type impurity 0.5 grade in LHG2 steel reach more than 90%, substantially increases the cleanliness factor of molten steel.
Description
Technical field
The present invention relates to a kind of refining cover for continuous casting production and preparation method thereof, belong to Ferrous Metallurgy continuous casting production technology field.
Background technology
Continuous casting production air curtain barricade wall technology, it is grow up for 20 end of the centurys one new technology removing non-metallic inclusions in molten steel in continuous casting production, its principle is, utilize the bar shaped air brick vertical with molten steel flow direction, be placed in a certain position at the bottom of tundish, be blown into argon gas, argon gas is through air brick floating formation one microbubble air curtain barrier, field trash is flutterred and is caught, floats by these microbubbles, thus adsorb by slag blanket, reach the object of removal of inclusions cleaning molten steel.
Although existing gas brick air curtain barricade wall can remove field trash in molten steel to a certain extent, play the object of cleaning molten steel, but still there is following technological deficiency, the air-blowing quantity of air brick is limited, the top of the slag can not be blown open, air-blowing quantity greatly easily causes blowing slag face open and causing molten steel slag and secondary oxidation of steel, so the Argon Bubble that air curtain barricade wall is formed is caught and removal of inclusions limited in one's ability, apply traditional flow control device on year-on-year basis, improving molten steel flow characteristic, removal of inclusions aspect does not show superiority, also the control overflow of high-purity clean steel to field trash cannot be met.
CN102764868A discloses a kind of blowing refining apparatus for removing tundish molten steel inclusion, it is characterized in that purifier comprises tundish (1), blowning installation (2), impregnating cover (3), permanent layer (5), working lining (6), compacted zone (7), air-permeable layer (8), air chamber (9), tracheae (10), air brick (11), cover body (12), immerses part (13), automatic lifting system (14), steam vent (15), described tundish comprises permanent layer (5) and is arranged on the working lining (6) on permanent layer inner surface, blowning installation (2) is provided with bottom described permanent layer, described blowning installation comprises air brick (11) and breather pipe (10), described air brick comprises compacted zone (7) and air-permeable layer (8), air chamber (9) is had in the middle part of described air-permeable layer, ambient atmos is blown in described air chamber by described breather pipe, described impregnating cover (3) is the refractory material cover supported by steel plate, be arranged on directly over described blowning installation (2), be connected with automatic lifting system (14), impregnating cover is made up of cover body (12) and immersion part (13), is provided with steam vent (15).Adopt this device can introduce the air curtain barricade wall of atm number, form continuously bubble column closely, obviously extend molten steel mean residence time in tundish.But this invention has the following disadvantages: 1) cover body (12) of impregnating cover is individual layer steel plate structure, easily deforms under applied at elevated temperature condition, and cause coming off of immersion part (13) refractory material, cause impregnating cover low for service life.2) cover body of impregnating cover is provided with steam vent, from air brick air chamber blowout argon through molten steel gas by impregnating cover steam vent discharge, damp and hot argon gas directly washes away the tundish cover inner lining refractory (not indicating in diagram) above impregnating cover, air-flow washes away tundish cover inner lining refractory same position for a long time, cause this position liner delamination to fall material and pollute molten steel, in the course of time, tundish cover can be made to chap, be out of shape, have a strong impact on the service life of tundish cover, cause cost to increase; 3) directly discharged outside tundish by the steam vent impregnating cover from the argon gas of air brick air chamber blowout through molten steel, argon gas does not carry out circulation utilization, causes the argon gas wasting of resources.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of refining cover for continuous casting production, this refining cover and air curtain air brick combinationally use, from the large discharge argon gas of air curtain air brick blowout, continuous bubble column is closely formed between air curtain air brick and refining cover, blow brokenly slag face below refining cover, avoid producing molten steel slag and secondary oxidation of steel, improve Argon Bubble to catch and the ability of removal of inclusions, this refining cover makes in the space in argon gas circulation to tundish between slag face and clad simultaneously, argon envelope is formed above slag face, effectively play the effect of isolated air, the secondary oxidation of molten steel is reduced in protection slag face, four type impurity 0.5 grade in LHG2 steel is made to reach more than 90%, substantially increase the cleanliness factor of molten steel, extend the service life of tundish cover liner simultaneously, water by 15 ~ 20 and time to bring up to 35 ~ 40 on year-on-year basis and to water time.
Technical scheme of the present invention is as follows:
A kind of refining cover for continuous casting production, it is characterized in that, comprise outer arc plate (12), inner arc plate (13) and impregnating cover (14), described inner arc plate is sleeved on impregnating cover, the inwall of inner arc plate (13) is provided with anchor studs, inner arc plate is fixedly connected with impregnating cover by anchor studs, outer arc plate is sleeved on the top of inner arc plate, the outer wall of inner arc plate is fixed with connection ball, described outer arc plate is linked together by connection ball and inner arc plate, gap is provided with between outer arc plate and inner arc plate, this gap is circulation seam, described circulation seam is communicated with the space between Slag Layer in tundish cover and tundish, impregnating cover is provided with the steam vent running through impregnating cover, inner arc plate is provided with the through hole relative with steam vent, described steam vent to be stitched with circulation by through hole and is communicated with.
The present invention is preferred, and the through hole (16) on described inner arc plate is identical with the quantity of the steam vent (17) on impregnating cover, and all with distribution, and the longitudinal centre line of steam vent overlaps with the longitudinal centre line of through hole.
Preferred further, the quantity of described impregnating cover upper air-vent is 6 ~ 9, and the internal diameter d of steam vent (17) is 10 ~ 15mm, and the internal diameter D of through hole (16) is 15 ~ 25mm, and the height e of circulation seam (18) is 10 ~ 20mm.
Described impregnating cover (14) is casting material prefabricated of corundum-spinel, the cross section of impregnating cover is trapezoidal, trapezoidal internal is provided with the inner chamber of bottom end opening, described inner chamber is up-narrow and down-wide trapezoidal, the upper end width m of inner chamber is 200 ~ 250mm, bottom width n is 250 ~ 350mm, and the wall thickness c of impregnating cover (14) is 60 ~ 100mm.
The present invention is preferred, described outer arc plate (12) is identical with the thickness of inner arc plate (13), include transverse slat and side plate, transverse slat is in be horizontally disposed with and parallel with Slag Layer, side plate is connected to the two ends of transverse slat and downward-sloping, described side plate and the junction of transverse slat are arc transition, and the angle between the plane at side plate place and the plane at transverse slat place is 110 ~ 140 °, and the shape of described impregnating cover and the matching form of inner arc plate close.
Preferred further, the thickness b of described outer arc plate (12), inner arc plate (13) is 20 ~ 25mm.
The present invention is preferred, and be also provided with gusset in the outside of outer arc plate, the shape of described gusset and the matching form of outer arc plate close, and described gusset (15) width k is 15 ~ 20mm, and quantity is 7 ~ 9, is evenly distributed on the outer wall of outer arc plate (12).
Described outer arc plate (12), inner arc plate (13), gusset (15) material are heat-resistance stainless steel.
Impregnating cover of the present invention is provided with steam vent, inner arc plate is provided with the through hole relative with steam vent, steam vent to be stitched with circulation by through hole and is communicated with, and the angle between the plane at the side plate place of inner arc plate and the plane at transverse slat place is 110 ~ 140 °, it is all based on task of the present invention: protection slag face, reduce the secondary oxidation of molten steel, reduce inclusion content in melting steel amount, improve Cleanliness of Molten Steel, extend refining cover service life and service life of tundish cover, the argon gas that steam vent on Appropriate application impregnating cover is discharged, reduce costs, and it is regioselective, be provided with circulation between the outer arc plate of refining cover of the present invention and inner arc plate to stitch, and be connected with the space in tundish cover and tundish between Slag Layer, in being stitched by the steam vent circulation entered between the outer arc plate of refining cover and inner arc plate from the argon gas of air curtain air brick blowout through molten steel, circulation seam plays a part to relax reduction of speed to argon gas stream, make argon gas stream prompt drop low, make to be blown into Argon Bubble circulation in molten steel in the space in tundish between slag face and clad, argon envelope is formed above slag face, effectively play the effect of isolated air, prevent argon gas stream from washing away tundish cover inner lining refractory, liner delamination is fallen material and is polluted molten steel, avoid tundish cover be full of cracks, distortion, extend the service life of tundish cover, effectively make use of the argon gas of discharge simultaneously, argon gas is made to carry out circulation utilization, argon envelope is formed above slag face, the secondary oxidation of molten steel is reduced in protection slag face, angle between the plane at inner arc plate side plate place of the present invention and the plane at transverse slat place is 110 ~ 140 °, this kind of design of side plate and transverse slat, play to change to argon gas stream and flow to and reduction of speed effect, argon gas enters above tundish Slag Layer through circulation seam, the tiling exhibition in moderate water, excessive or the too small level that all can affect argon gas of angle between the plane at inner arc plate side plate place and the plane at transverse slat place is sprawled, if the excessive argon gas stream that causes of angle washes away middle handbag edge, cause bag along collapsing material, argon gas stream is caused to blow Slag Layer open if angle crosses I, cause molten steel slag.Purifier of the present invention, makes four type impurity 0.5 grade in LHG2 steel reach more than 90%, improves the cleanliness factor of molten steel.
When refining cover of the present invention uses, combinationally use with air curtain air brick, to be positioned at directly over air curtain air brick and relative with air curtain air brick, the two side ends of refining cover is fixed in middle handbag wall permanent liner, the lower end of refining cover is immersed in the molten steel in tundish below Slag Layer, in the space of upper end in tundish cover and tundish between Slag Layer.
The present invention is preferred, the described corundum for impregnating cover (14)-spinel castable, be made up of following material by weight percentage: the fused white corundum 28 ~ 32% of 8 ~ 5mm granularity, the fused white corundum 10 ~ 12% of 3mm≤granularity <5mm, the fused white corundum 16 ~ 20% of 1mm≤granularity <3mm, the plate diamond spar 13 ~ 16% of 0.083mm< granularity <1mm, 180 object plate diamond spar fine powders 4.0 ~ 6.0%, 325 object plate diamond spar micro mists 4.0 ~ 6.0%, 325 object aluminum-spinel micro mists 2.0 ~ 4.0%, 325 object α-Al
2o
3micro mist 1.5 ~ 2.0%, the α-Al of 625 objects
2o
3ultramicro-powder 2.0 ~ 2.5%, SiO
2ultramicro-powder 1.0 ~ 1.3%, pure calcium aluminate cement 4.0 ~ 4.3%, 200 object highly-purity magnesite fine powders 4.5 ~ 5.5%, sodium phosphate trimer 0.1 ~ 0.15%, heat-resistant steel fiber 0.05 ~ 0.08%, is all weight percentage.
Described fused white corundum particle volume density>=3.41g.cm
-3, refractoriness > 1850 DEG C, Al
2o
3percentage composition>=98.0%(weight ratio), all the other are SiO
2, Fe
2o
3, TiO
2, K
2o, Na
2o impurity content.
Described plate diamond spar particle volume density>=3.76g/cm
3, refractoriness > 1850 DEG C, Al
2o
3percentage composition>=99.30%(weight ratio), all the other are SiO
2, Fe
2o
3, TiO
2, Na
2o impurity content.
Described highly-purity magnesite selects highly-purity magnesite 97, particle volume density>=3.0g/cm
3, content of MgO percentage>=97.6%, all the other are CaO, SiO
2, Fe
2o
3, Al
2o
3impurity content.
The described pure calcium aluminate cement trade mark is CA-70.The trade mark is following (following composition all by weight percentage): the Al of specific targets of the pure calcium aluminate cement of CA-70
2o
368.5-71.5%; CaO26.5-30.5%; SiO
2≤ 0.5%; Fe
2o
3≤ 0.5%; Specific area (cm2/g)>=5000; Initial set setting time (min)>=150; Final set (h)≤6; 24h curing strength (MPa) rupture strength (MPa)>=5, compression strength (MPa)>=40, refractoriness (DEG C) 1680.Examination criteria is GB201-2000.
Described α-Al
2o
3ultramicro-powder, its Al
2o
3percentage composition>=99.2%, all the other are SiO
2, Fe
2o
3, NaO
2impurity content.
Described SiO
2ultramicro-powder, wherein SiO
2percentage composition>=92%, granularity is less than 5 μm, and granularity be less than 2 μm account for 80 ~ 85%.
Described heat-resistant steel fiber produces with the heat resisting steel containing chrome-nickel element, cross section is 0.2mm × 1.0mm, length has 20mm, 25mm, 30mm and 35mm tetra-kinds of specifications, the trade mark is 330,310,304,446 and 430, the present invention selects one wherein, and the heat-resistant steel fiber physical and chemical index of each trade mark sees the following form 1:
Table 1 heat-resistant steel fiber physical and chemical index
Preferred further, the described corundum for impregnating cover (14)-spinel castable, be made up of following material by weight percentage: the fused white corundum 28% of 8 ~ 5mm granularity, the fused white corundum 10% of 3mm≤granularity <5mm, the fused white corundum 20% of 1mm≤granularity <3mm, the plate diamond spar 13% of 0.083mm< granularity <1mm, 180 object plate diamond spar fine powders 6.0%, 325 object plate diamond spar micro mists 4.0%, α-the Al of 325 object aluminum-spinel micro mist 4.0%, 325 objects
2o
3micro mist 2.0%, 625 object α-Al
2o
3ultramicro-powder 2.0%, SiO
2ultramicro-powder 1.3%, the trade mark is pure calcium aluminate cement 4.0%, the 200 object highly-purity magnesite fine powder 5.5% of CA70, and sodium phosphate trimer 0.12%, heat-resistant steel fiber 0.08%, is all weight percentage.
The present invention also provides a kind of preparation method of the refining cover for continuous casting production, comprises the following steps:
1) difference processing and fabricating outer arc plate, inner arc plate, gusset, and anchor studs is welded on inner arc plate internal chamber wall;
2) inner arc plate is placed on prefabricated component shake table, installs impregnating cover casting tyre mould, and on impregnating cover casting tyre mould inwall coating lubricating oil;
3), after the described component material being used for the corundum-spinel castable of impregnating cover (14) being weighed, add in batch mixer and be dry mixed 2 ~ 3 minutes, add the water of material gross weight 5.0 ~ 6.0%, wet mixing 4 ~ 6 minutes, mixing;
4) castable after mixing is put into loose tool, feed in raw material while vibrate with vibrating head, until stop vibration after surperficial bleeding, completely exhaust, floating, finishing, the green compact casting complete of impregnating cover prefabricated component, then maintenance 1 ~ 2 day under the environment temperature of 15 ~ 30 DEG C;
5) toast after maintenance, baking process is as follows: 1. first heat up with 10 DEG C/h programming rate from 0 ~ 120 DEG C, be warming up to 120 ~ 150 DEG C; 2. 120 ~ 150 DEG C of insulations, temperature retention time 12 ~ 16h; 3. heat up with 10 DEG C/h programming rate from 120 ~ 150 DEG C again, be warming up to 250 ~ 300 DEG C; 4. again from 250 ~ 300 DEG C with 15 DEG C/h programming rate heat up, be warming up to 400 ~ 450 DEG C, 5. truce cools naturally, cool time 12 ~ 24h, impregnating cover prefabricated component has toasted,
6) adjust gap to the 10 ~ 20mm between outer arc plate and inner arc plate, be connected together by being connected ball bonding with inner arc plate by outer arc plate, gusset on uniform welding on the outer wall of outer arc plate, refining cover completes.
Utilize the refining cover of continuous casting production of the present invention to remove the method for field trash in molten steel in tundish, comprise the following steps:
When refining cover uses, combinationally use with air curtain air brick, to be positioned at directly over air curtain air brick and relative with air curtain air brick, the two side ends of refining cover is fixed in middle handbag wall permanent liner, the lower end of the impregnating cover of refining cover is immersed in the molten steel in tundish below Slag Layer, Inner arc plate, in the space of outer arc plate in tundish cover and tundish between Slag Layer, argon gas is blown into by air curtain air brick, argon gas forms the large air curtain barrier of continuous closeness between air curtain air brick and impregnating cover, catch the field trash in molten steel, drive inclusion floating, adsorbed by Slag Layer, the Slag Layer that argon gas breaks through below impregnating cover continues up, through steam vent, through hole enters circulation seam, argon gas enters above tundish Slag Layer through circulation seam, sprawl in level, space in tundish between Slag Layer and tundish cover forms argon gas-sealed.
The present invention is preferred, and the lower end molten steel degree of depth be immersed in tundish below Slag Layer of impregnating cover is 30 ~ 50mm.
Beneficial effect of the present invention:
1) refining cover of the present invention adopts the double-deck circumferential weld structure of heat-resistance stainless steel inner arc plate, outer arc plate and interior liner in pouring corundum-spinel castable, there is high temperature-proof distortion function, the difficult drop-off of resistance to material, high life, can use 6 ~ 10 continuous casting production to water secondary.
2) be provided with circulation between the outer arc plate of refining cover of the present invention and inner arc plate to stitch, and be connected with the space in tundish cover and tundish between Slag Layer, in being stitched by the steam vent circulation entered between the outer arc plate of refining cover and inner arc plate from the argon gas of air curtain air brick blowout through molten steel, circulation seam plays argon gas stream and changes the flow direction and reduction of speed effect, make to be blown into Argon Bubble circulation in molten steel in the space in tundish between slag face and clad, argon envelope is formed above slag face, effectively play the effect of isolated air, prevent argon gas stream from washing away tundish cover inner lining refractory, liner delamination is fallen material and is polluted molten steel, avoid tundish cover be full of cracks, distortion, extend the service life of tundish cover.
3) refining cover of the present invention effectively make use of the argon gas of discharge, makes argon gas carry out circulation utilization, forms argon envelope above slag face, and the secondary oxidation of molten steel is reduced in protection slag face, further increases the cleanliness factor of molten steel.
The present invention applies on Laiwu steel enterprise Yin Shan shaped steel Co., Ltd steel mill single current slab CC tundish, reaches 11 continuous casting production the highest service life and waters secondary.Meanwhile, the application of this invention, makes four type impurity 0.5 grade in LHG2 steel reach more than 90%, substantially increases the cleanliness factor of molten steel, extend the service life of tundish cover liner simultaneously, waters time to bring up to 35 ~ 40 on year-on-year basis and to water time by 15 ~ 20.
Accompanying drawing explanation
Fig. 1 is the main TV structure schematic diagram of refining cover in the embodiment of the present invention,
Fig. 2 is refining cover A-A cross-sectional view in the embodiment of the present invention,
Fig. 3 is that in continuous casting production of the present invention, refining covers on the schematic diagram in tundish.
In figure, 1. turbulence inhibitor; 2. refining cover; 3. argon gas is through the bar shaped air curtain barrier of air curtain air brick floating formation; 4. air curtain air brick; 5. liner in dundish; 6. tundish permanent liner; 7. the argon gas-sealed that the space in tundish between Slag Layer and tundish cover is formed; 8 filling pipe ends; 9. tundish cover; 10. Slag Layer in tundish; 11. large bag long nozzles; 12. outer arc plates; 13. inner arc plates; 14. impregnating covers; 15. gussets; 16. through holes; 17. steam vents; 18. circulation seams; 19. connect ball; 20. anchor studs.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described, but be not limited thereto.
Embodiment 1
A kind of refining cover for continuous casting production, structure is as Fig. 1, shown in Fig. 2, comprise outer arc plate 12, inner arc plate 13 and impregnating cover 14, described inner arc plate 12 is sleeved on impregnating cover 14, the inwall of inner arc plate 13 is provided with anchor studs 20, inner arc plate 13 is fixedly connected with impregnating cover 14 by anchor studs 20, outer arc plate 12 is sleeved on the top of inner arc plate 13, the outer wall of inner arc plate 13 is fixed with and connects ball 19, outer arc plate 12 links together with inner arc plate 13 by connecting ball 19, gap is provided with between outer arc plate 12 and inner arc plate 13, this gap is circulation seam 18, circulation seam 18 height e is 10mm, circulation seam 18 is communicated with the space between Slag Layer 10 in tundish cover 9 and tundish, impregnating cover 14 is provided with the steam vent 17 running through impregnating cover 14, inner arc plate 13 is provided with the through hole 16 relative with steam vent 16, steam vent 17 stitches 18 by through hole 16 with circulation and is communicated with.Through hole 16 on inner arc plate is identical with the quantity of the steam vent 17 on impregnating cover, and the longitudinal centre line of steam vent overlaps with the longitudinal centre line of through hole.The present invention is preferred, and the through hole 16 on inner arc plate 13 is 6, and the internal diameter D of through hole 16 is 15mm, and the steam vent 17 on impregnating cover 14 is 6, and the internal diameter d of steam vent 17 is 10mm.
Described impregnating cover 14 is casting material prefabricated of corundum-spinel, the cross section of described impregnating cover is trapezoidal, trapezoidal internal is provided with the inner chamber of bottom end opening, described inner chamber is up-narrow and down-wide trapezoidal, the upper end width m of inner chamber is 200mm, bottom width n is 250mm, and the thickness c of impregnating cover 14 is 60mm.Outer arc plate 12 is identical with the thickness of inner arc plate 13, the thickness b of outer arc plate 12, inner arc plate 13 is 20mm, include transverse slat and side plate, transverse slat is in be horizontally disposed with and parallel with Slag Layer, side plate is connected to the two ends of transverse slat and downward-sloping, described side plate and the junction of transverse slat are arc transition, and the angle between the plane at side plate place and the plane at transverse slat place is 110 °, and the shape of described impregnating cover and the matching form of inner arc plate close.
On outer wall, be provided with gusset 15 at outer arc plate 12, the shape of gusset 15 and the matching form of outer arc plate 12 close, and gusset 15 width k is 20mm, and quantity is 7, is evenly distributed on the outer wall of outer arc plate 12.Outer arc plate 12, inner arc plate 13, gusset 15 material are 2Cr25N.
For the corundum-spinel castable of impregnating cover 14, be made up of following material by weight percentage: the fused white corundum 28% of 8 ~ 5mm granularity, the fused white corundum 10% of 3mm≤granularity <5mm, the fused white corundum 20% of 1mm≤granularity <3mm, the plate diamond spar 13% of 0.083mm< granularity <1mm, 180 object plate diamond spar fine powders 6.0%, 325 object plate diamond spar micro mists 4.0%, α-the Al of 325 object Spinel micropowder 4.0%, 325 objects
2o
3micro mist 2.0%, the α-Al of 625 objects
2o
3ultramicro-powder 2.0%, SiO
2ultramicro-powder 1.3%, the trade mark is pure calcium aluminate cement 4.0%, the 200 object highly-purity magnesite fine powder 5.5% of CA70, and sodium phosphate trimer 0.12%, heat-resistant steel fiber 0.08%, is all weight percentage.Heat-resistant steel fiber, selects the trade mark to be 330.
Embodiment 2
Its preparation method of the refining cover for continuous casting production described in embodiment 1, comprises the following steps:
1) difference processing and fabricating outer arc plate 12, inner arc plate 13, gusset 15, and anchor studs 20 is welded on inner arc plate 13 internal chamber wall;
2) inner arc plate 13 is placed on prefabricated component shake table, installs impregnating cover casting tyre mould, and on impregnating cover casting tyre mould inwall coating lubricating oil;
3), after the described component material being used for the corundum-spinel castable of impregnating cover 14 being weighed, add in batch mixer and be dry mixed 2 minutes, add the water of material gross weight 5.0%, wet mixing 4 minutes, mixing;
4) castable after mixing is put into loose tool, feed in raw material while vibrate with vibrating head, until stop vibration after surperficial bleeding, completely exhaust, floating, finishing, the green compact of the prefabricated component of impregnating cover 14 complete, then maintenance 1 day under the environment temperature of 15 ~ 30 DEG C;
5) toast after maintenance, baking process is divided into the next stage: 1. heat up with 10 DEG C/h programming rate from 0 ~ 120 DEG C, be warming up to 120 DEG C; 2. 120 DEG C of insulations, temperature retention time 12h; 3. heat up with 10 DEG C/h programming rate from 120 DEG C again, be warming up to 250 DEG C; 4. again from 250 DEG C with 15 DEG C/h programming rate heat up, be warming up to 400 DEG C, 5. truce cools naturally, cool time 12h, the prefabricated component of impregnating cover 14 has toasted.
6) adjust outer arc plate to weld together between outer arc plate 12 with inner arc plate 13 by being connected ball 19 to 10mm with the gap between inner arc plate, gusset on uniform welding on the outer wall of outer arc plate, refining cover completes.
Embodiment 3
As described in Example 1 for the refining cover of continuous casting production, difference is:
Circulation seam 18 height e is 20mm, and the through hole 16 on inner arc plate 13 is 9, and the internal diameter D of through hole 16 is 25mm, and the steam vent 17 on impregnating cover 14 is 9, and the internal diameter d of steam vent 17 is 15mm.
The cross section of impregnating cover is trapezoidal, and trapezoidal internal is provided with the inner chamber of bottom end opening, and described inner chamber is up-narrow and down-wide trapezoidal, and the upper end width m of inner chamber is 250mm, and bottom width n is 350mm, and the thickness c of impregnating cover 14 is 100mm.Outer arc plate 12 is identical with the thickness of inner arc plate 13, the thickness b of outer arc plate 12, inner arc plate 13 is 25mm, include transverse slat and side plate, transverse slat is in be horizontally disposed with and parallel with Slag Layer, side plate is connected to the two ends of transverse slat and downward-sloping, described side plate and the junction of transverse slat are arc transition, and the angle between the plane at side plate place and the plane at transverse slat place is 120 °.
The described corundum for impregnating cover 14-spinel castable, be made up of following material by weight percentage: the fused white corundum 30% of 8 ~ 5mm granularity, the fused white corundum 12% of 3mm≤granularity <5mm, the fused white corundum 16% of 1mm≤granularity <3mm, the plate diamond spar 16% of 0.083mm< granularity <1mm, 180 object plate diamond spar fine powders 4.0%, 325 object plate diamond spar micro mists 6.0%, α-the Al of 325 object Spinel micropowder 2.0%, 325 objects
2o
3micro mist 1.5%, the α-Al of 625 objects
2o
3ultramicro-powder 2.5%, SiO
2ultramicro-powder 1.0%, the trade mark is pure calcium aluminate cement 4.3%, the 200 object highly-purity magnesite fine powder 4.5% of CA70, and sodium phosphate trimer 0.15%, heat-resistant steel fiber 0.05%, is all weight percentage.Described heat-resistant steel fiber, selects the trade mark to be 304.
Embodiment 4
Its preparation method of the refining cover for continuous casting production described in embodiment 3, comprises the following steps:
1) difference processing and fabricating outer arc plate 12, inner arc plate 13, gusset 15, and anchor studs 20 is welded on inner arc plate 13 internal chamber wall;
2) inner arc plate 13 is placed on prefabricated component shake table, installs impregnating cover casting tyre mould, and on impregnating cover casting tyre mould inwall coating lubricating oil;
3), after the described component material being used for the corundum-spinel castable of impregnating cover 14 being weighed, add in batch mixer and be dry mixed 3 minutes, add the water of material gross weight 6.0%, wet mixing 6 minutes, mixing;
4) castable after mixing is put into loose tool, feed in raw material while vibrate with vibrating head, until stop vibration after surperficial bleeding, completely exhaust, floating, finishing, the green compact of the prefabricated component of impregnating cover 14 complete, then maintenance 2 days under the environment temperature of 15 ~ 30 DEG C;
5) toast after maintenance, baking process is divided into the next stage: 1. heat up with 10 DEG C/h programming rate from 0 ~ 120 DEG C, be warming up to 120 DEG C; 2. 120 DEG C of insulations, temperature retention time 12h; 3. heat up with 10 DEG C/h programming rate from 120 DEG C again, be warming up to 250 DEG C; 4. again from 250 DEG C with 15 DEG C/h programming rate heat up, be warming up to 400 DEG C, 5. truce cools naturally, cool time 12h, the prefabricated component of impregnating cover 14 has toasted.
6) adjust outer arc plate to weld together between outer arc plate 12 with inner arc plate 13 by being connected ball 19 to 20mm with the gap between inner arc plate, gusset on uniform welding on the outer wall of outer arc plate, refining cover completes.
Embodiment 5
As described in Example 1 for the refining cover of continuous casting production, difference is:
Circulation seam 18 height e is 15mm, and the through hole 16 on inner arc plate 13 is 8, and the internal diameter D of through hole 16 is 20mm, and the steam vent 17 on impregnating cover 14 is 8, and the internal diameter d of steam vent 17 is 12mm.
The cross section of impregnating cover is trapezoidal, and trapezoidal internal is provided with the inner chamber of bottom end opening, and described inner chamber is up-narrow and down-wide trapezoidal, and the upper end width m of inner chamber is 250mm, and bottom width n is 350mm, and the thickness c of impregnating cover 14 is 100mm.Outer arc plate 12 is identical with the thickness of inner arc plate 13, the thickness b of outer arc plate 12, inner arc plate 13 is 22mm, include transverse slat and side plate, transverse slat is in be horizontally disposed with and parallel with Slag Layer, side plate is connected to the two ends of transverse slat and downward-sloping, described side plate and the junction of transverse slat are arc transition, and the angle between the plane at side plate place and the plane at transverse slat place is 130 °.
Described gusset 15 is uniformly distributed 8 on the outer wall of outer arc plate 12, and its width k is 17mm.
The described corundum for impregnating cover 14-spinel castable, be made up of following material by weight percentage: the fused white corundum 32% of 8 ~ 5mm granularity, the fused white corundum 11% of 3mm≤granularity <5mm, the fused white corundum 14% of 1mm≤granularity <3mm, the plate diamond spar 15% of 0.083mm< granularity <1mm, 180 object plate diamond spar fine powders 5.0%, 325 object plate diamond spar micro mists 5.0%, α-the Al of 325 object Spinel micropowder 3.0%, 325 objects
2o
3micro mist 1.8%, the α-Al of 625 objects
2o
3ultramicro-powder 2.3%, SiO
2ultramicro-powder 1.3%, the trade mark is pure calcium aluminate cement 4.1%, the 200 object highly-purity magnesite fine powder 5.3% of CA70, and sodium phosphate trimer 0.13%, heat-resistant steel fiber 0.07%, is all weight percentage.Described heat-resistant steel fiber, selects the trade mark to be 430.
Claims (9)
1. the refining cover for continuous casting production, it is characterized in that, comprise outer arc plate (12), inner arc plate (13) and impregnating cover (14), described inner arc plate is sleeved on impregnating cover, the inwall of inner arc plate (13) is provided with anchor studs, inner arc plate is fixedly connected with impregnating cover by anchor studs, outer arc plate is sleeved on the top of inner arc plate, the outer wall of inner arc plate is fixed with connection ball, described outer arc plate is linked together by connection ball and inner arc plate, gap is provided with between outer arc plate and inner arc plate, this gap is circulation seam, described circulation seam is communicated with the space between Slag Layer in tundish cover and tundish, impregnating cover is provided with the steam vent running through impregnating cover, inner arc plate is provided with the through hole relative with steam vent, described steam vent to be stitched with circulation by through hole and is communicated with, the quantity of described impregnating cover upper air-vent is 6 ~ 9, the internal diameter d of steam vent (17) is 10 ~ 15mm, the internal diameter D of through hole (16) is 15 ~ 25mm, and the height e of circulation seam (18) is 10 ~ 20mm, and the thickness b of described outer arc plate (12), inner arc plate (13) is 20 ~ 25mm.
2. the refining cover for continuous casting production according to claim 1, is characterized in that, the through hole (16) on described inner arc plate is identical with the quantity of the steam vent (17) on impregnating cover, and the longitudinal centre line of steam vent overlaps with the longitudinal centre line of through hole.
3. the refining cover for continuous casting production according to claim 1, it is characterized in that, described impregnating cover (14) is casting material prefabricated of corundum-spinel, the cross section of impregnating cover is trapezoidal, trapezoidal internal is provided with the inner chamber of bottom end opening, and described inner chamber is up-narrow and down-wide trapezoidal, and the upper end width m of inner chamber is 200 ~ 250mm, bottom width n is 250 ~ 350mm, and the wall thickness c of impregnating cover (14) is 60 ~ 100mm.
4. the refining cover for continuous casting production according to claim 1, it is characterized in that, described outer arc plate (12) is identical with the thickness of inner arc plate (13), include transverse slat and side plate, transverse slat is in be horizontally disposed with and parallel with Slag Layer, side plate is connected to the two ends of transverse slat and downward-sloping, described side plate and the junction of transverse slat are arc transition, angle between the plane at side plate place and the plane at transverse slat place is 110 ~ 140 °, and the shape of described impregnating cover and the matching form of inner arc plate close.
5. the refining cover for continuous casting production according to claim 1, it is characterized in that, also gusset is provided with in outside at outer arc plate, the shape of described gusset and the matching form of outer arc plate close, described gusset (15) width k is 15 ~ 20mm, quantity is 7 ~ 9, is evenly distributed on the outer wall of outer arc plate (12).
6. the refining cover for continuous casting production according to claim 3, it is characterized in that, the described corundum for impregnating cover (14)-spinel castable, be made up of following material by weight percentage: the fused white corundum 28 ~ 32% of 5 ~ 8mm granularity, the fused white corundum 10 ~ 12% of 3mm≤granularity <5mm, the fused white corundum 16 ~ 20% of 1mm≤granularity <3mm, the plate diamond spar 13 ~ 16% of 0.083mm< granularity <1mm, 180 object plate diamond spar fine powders 4.0 ~ 6.0%, 325 object plate diamond spar micro mists 4.0 ~ 6.0%, 325 object aluminum-spinel micro mists 2.0 ~ 4.0%, 325 object α-Al
2o
3micro mist 1.5 ~ 2.0%, 625 object α-Al
2o
3ultramicro-powder 2.0 ~ 2.5%, SiO
2ultramicro-powder 1.0 ~ 1.3%, pure calcium aluminate cement 4.0 ~ 4.3%, 200 object highly-purity magnesite fine powders 4.5 ~ 5.5%, sodium phosphate trimer 0.1 ~ 0.15%, heat-resistant steel fiber 0.05 ~ 0.08%, is all weight percentage.
7. the refining cover for continuous casting production according to claim 6, it is characterized in that, the described corundum for impregnating cover (14)-spinel castable, be made up of following material by weight percentage: the fused white corundum 28% of 5 ~ 8mm granularity, the fused white corundum 10% of 3mm≤granularity <5mm, the fused white corundum 20% of 1mm≤granularity <3mm, the plate diamond spar 13% of 0.083mm< granularity <1mm, 180 object plate diamond spar fine powders 6.0%, 325 object plate diamond spar micro mists 4.0%, 325 object aluminum-spinel micro mists 4.0%, 325 object α-Al
2o
3micro mist 2.0%, 625 object α-Al
2o
3ultramicro-powder 2.0%, SiO
2ultramicro-powder 1.3%, the trade mark is pure calcium aluminate cement 4.0%, the 200 object highly-purity magnesite fine powder 5.5% of CA70, and sodium phosphate trimer 0.12%, heat-resistant steel fiber 0.08%, is all weight percentage.
8. the preparation method of the refining cover for continuous casting production according to claim 1, comprises the following steps:
1) difference processing and fabricating outer arc plate, inner arc plate, gusset, and anchor studs is welded on inner arc plate internal chamber wall;
2) inner arc plate is placed on prefabricated component shake table, installs impregnating cover casting tyre mould, and on impregnating cover casting tyre mould inwall coating lubricating oil;
3), after the component material weighing of the corundum-spinel castable of impregnating cover (14) will be used for, add in batch mixer and be dry mixed 2 ~ 3 minutes, add the water of material gross weight 5.0 ~ 6.0%, wet mixing 4 ~ 6 minutes, mixing;
4) castable after mixing is put into loose tool, feed in raw material while vibrate with vibrating head, until stop vibration after surperficial bleeding, completely exhaust, floating, finishing, the green compact casting complete of impregnating cover prefabricated component, then maintenance 1 ~ 2 day under the environment temperature of 15 ~ 30 DEG C;
5) toast after maintenance, baking process is as follows: 1. first heat up with 10 DEG C/h programming rate from 0 ~ 120 DEG C, be warming up to 120 ~ 150 DEG C; 2. 120 ~ 150 DEG C of insulations, temperature retention time 12 ~ 16h; 3. heat up with 10 DEG C/h programming rate from 120 ~ 150 DEG C again, be warming up to 250 ~ 300 DEG C; 4. again from 250 ~ 300 DEG C with 15 DEG C/h programming rate heat up, be warming up to 400 ~ 450 DEG C, 5. truce cools naturally, cool time 12 ~ 24h, impregnating cover prefabricated component has toasted;
6) adjust gap to the 10 ~ 20mm between outer arc plate and inner arc plate, be connected together by being connected ball bonding with inner arc plate by outer arc plate, gusset on uniform welding on the outer wall of outer arc plate, refining cover completes.
9. utilize the refining cover of the continuous casting production described in claim 1 to remove a method for field trash in molten steel in tundish, comprise the following steps:
When refining cover uses, combinationally use with air curtain air brick, to be positioned at directly over air curtain air brick and relative with air curtain air brick, the two side ends of refining cover is fixed in middle handbag wall permanent liner, the lower end of the impregnating cover of refining cover is immersed in the molten steel in tundish below Slag Layer, inner arc plate, in the space of outer arc plate in tundish cover and tundish between Slag Layer, argon gas is blown into by air curtain air brick, argon gas forms the large air curtain barrier of continuous closeness between air curtain air brick and impregnating cover, catch the field trash in molten steel, drive inclusion floating, adsorbed by Slag Layer, the Slag Layer that argon gas breaks through below impregnating cover continues up, through steam vent, through hole enters circulation seam, argon gas enters above tundish Slag Layer through circulation seam, sprawl in level, space in tundish between Slag Layer and tundish cover forms argon gas-sealed.
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| US3944176A (en) * | 1974-06-24 | 1976-03-16 | Illinois Tool Works Inc. | Universal mounting backboard |
| JPS596313A (en) * | 1982-07-02 | 1984-01-13 | Kawasaki Steel Corp | Removing process for inclusion in molten steel |
| CN101181743A (en) * | 2007-10-26 | 2008-05-21 | 上海大学 | Metal casting device equipped with noble gas protective sealing system |
| CN101962701B (en) * | 2010-08-19 | 2012-02-29 | 北京科技大学 | LT-CAS (Control Automatic System) double-station vacuum refining device and process method thereof |
| CN102728827B (en) * | 2012-07-23 | 2014-11-05 | 武汉钢铁(集团)公司 | Continuous casting tundish capable of improving molten steel cleanliness |
| CN103509913A (en) * | 2013-09-03 | 2014-01-15 | 西安前沿重型工业工程技术有限公司 | Argon-blowing oxygen-blowing molten steel refining apparatus with vacuum cap |
| CN203725726U (en) * | 2014-03-25 | 2014-07-23 | 莱芜钢铁集团有限公司 | Refining cover for continuous casting tundish |
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Effective date of registration: 20220621 Address after: 271104 Shuangquan Road, Gangcheng District, Jinan City, Shandong Province Patentee after: LAIGANG GROUP YINSHAN SHAPED STEEL Co.,Ltd. Address before: Friendship Street 271104 Shandong province Laiwu City Gangcheng District No. 38 Patentee before: LAIWU STEEL Group Ltd. |
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