CN104028740A - Upper pocket block for argon blowing of continuous casting tundish and mounting method and application of upper pocket block - Google Patents
Upper pocket block for argon blowing of continuous casting tundish and mounting method and application of upper pocket block Download PDFInfo
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- CN104028740A CN104028740A CN201410274361.5A CN201410274361A CN104028740A CN 104028740 A CN104028740 A CN 104028740A CN 201410274361 A CN201410274361 A CN 201410274361A CN 104028740 A CN104028740 A CN 104028740A
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Abstract
The invention relates to an upper pocket block for argon blowing of a continuous casting tundish. The upper pocket block comprises an upper pocket block body, ventilation ceramic rods, a gas chamber and a gas inlet pipe. The middle of the upper pocket block body is provided with a vertically through upper pocket mounting hole, the ventilation ceramic rods in circularly uniform arrangement and the circular gas chamber are arranged in the upper pocket block, the gas chamber is positioned at the bottoms of the ventilation ceramic rods and communicated with the ventilation ceramic rods, and the gas inlet pipe is connected to the side of the gas chamber. When argon is blown in, an annular gas curtain shield is formed around the upper pocket to perform gas washing on molten steel about to enter the upper pocket, floating and removing of slag inclusion are facilitated, the problem that slag is whirled away by eddies at the upper pocket under the low liquid level condition of the tundish is solved, and consequently cleanliness of the molten steel is improved while molten steel remained in the tundish is reduced.
Description
Technical field
The present invention relates to a kind of continuous casting tundish Argon filling pipe end brick cup and installation method and application, belong to continuous casting process technical field in Ferrous Metallurgy.
Background technology
Continuous casting tundish is as the metallurgical reaction between ladle and crystallizer, along with improving constantly that continuous casting billet quality requires, its effect is developed into and is had the inclusion floating of promotion, separation by basic functions such as initial decompression, current stabilization, storage steel, shuntings, prevent secondary oxidation of steel, the metallurgical function of controlling inclusion morphology and molten steel being carried out to microalloying.In recent years, continuous casting tundish air curtain barricade wall technology is progressively applied, its principle is: utilize the bar shaped air curtain barricade wall vertical with molten steel flow direction to be placed in turbulence inhibitor at the bottom of tundish and a certain position between filling pipe end, be blown into argon gas, argon gas sees through air curtain barricade wall floating and forms one microbubble air curtain barrier, these microbubbles are flutterred field trash and are caught, float, thereby are adsorbed by slag blanket, reach the object of removal of inclusions cleaning molten steel.But the deficiency of this technology is: (1) does not solve the filling pipe end eddy current slag problem under the low liquid level condition of tundish, and tundish note surplus is many, has increased iron and steel stock consumption, cost; (2) connect the laying of tracheae in tundish, adopt first pour into a mould tundish permanent liner, rear grooving lay tube connector method, the engineering time is long, labour intensity is large, operating expenses is high.
Chinese patent literature CN201455253U discloses a kind of a kind of Novel molten steel ladle nozzle pocket block using in steelmaking process, for tubular structure, Rotary-table by top Rotary-table, middle part cylinder, bottom forms, top Rotary-table feeder connection diameter D1 is 150～240mm, and the cylinder channel diameter D2 that bottom connects is 80～100mm.The height L1 of top Rotary-table is 80～200mm.The deficiency of this patented technology: without ventilated element, there is no the function of removal of inclusions, cleaning molten steel in pocket block, can not control and solve ladle mouth of a river slag problem, the molten steel amount in Casting Remnant is many.
Chinese patent literature CN202291395U discloses a kind of air-blowing tapping pocket block, comprise refractory aggregate, permeable-gas ceramics rod, gas blow pipe and air chamber box, described air chamber box has cannelure inner chamber, described permeable-gas ceramics rod and described air chamber box are all arranged in described refractory aggregate, and described permeable-gas ceramics rod and described gas blow pipe are communicated with respectively described air chamber box.Described air-blowing tapping pocket block steel flow is when brick cup, and upwards blowing gas floats with promotion nonmetal inclusion, thereby avoids nonmetal inclusion to be brought into the quality that improves steel in steel.The deficiency of this patented technology: permeable-gas ceramics rod (2) top is concordant with refractory aggregate (1), permeable-gas ceramics rod production location difficulty, finished product rate is low; Permeable-gas ceramics rod design height is large, and air chamber box and air inlet pipe, in the bottom of refractory aggregate (1), connect tracheae laying construction difficulty.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of continuous casting tundish Argon filling pipe end brick cup, this brick cup carries out air purge to entering the molten steel of filling pipe end, promote inclusion floating and removal, suppress the filling pipe end eddy generation slag problem under the low liquid level condition of tundish, not only improve the cleanliness factor of molten steel, and reduced the molten steel amount of tundish note in remaining, than applying Argon filling pipe end brick cup not, reduced on year-on-year basis the molten steel amount of tundish note in remaining more than 30%.
The present invention also provides the installation method of above-mentioned brick cup.
The present invention also provides the application of above-mentioned brick cup: utilize continuous casting tundish Argon filling pipe end brick cup to carry out the argon jetting method of the filling pipe end eddy generation slag under air purge molten steel, the low liquid level condition of inhibition tundish.
Technical scheme of the present invention is as follows:
A kind of continuous casting tundish Argon filling pipe end brick cup, comprise filling pipe end brick cup body (1), permeable-gas ceramics rod (2), air chamber box (3), air inlet pipe (4), the middle part of described filling pipe end brick cup body (1) is provided with the filling pipe end installing hole running through up and down, in described filling pipe end brick cup body (1), be provided with a plurality of permeable-gas ceramicses rods (2) that annular is evenly arranged and the air chamber box (3) of annular, described air chamber box is positioned at the bottom of permeable-gas ceramics rod and is communicated with permeable-gas ceramics rod, the sidepiece of air chamber box (3) is connected with air inlet pipe (4), one end of described air inlet pipe is connected to the sidepiece of air chamber box (3), the other end passes with outside tube connector (12) and is connected from the sidepiece of filling pipe end brick cup body (1), it is characterized in that, described permeable-gas ceramics rod (2) is truncated cone-shaped, and its top diameter is less than base diameter, on described air chamber box (3), be provided with a plurality of slots (5) that annular is evenly arranged, the shape of described slot, quantity, layout are corresponding with described permeable-gas ceramics rod (2), the upper surface of described filling pipe end brick cup body (1) is stretched out on the top of described permeable-gas ceramics rod (2), and the lower end of described permeable-gas ceramics rod (2) extend in the slot (5) on air chamber box.
The permeable-gas ceramics rod (2) of continuous casting tundish Argon filling pipe end brick cup of the present invention takes shape in filling pipe end brick cup body (1), be blown into after argon gas, argon gas sees through permeable-gas ceramics rod (2) and forms annular air curtain barrier around at filling pipe end, to being about to enter the molten steel of filling pipe end, carry out air purge, inclusion floating and removal have been promoted, suppress tundish upper nozzle eddy generation slag problem, not only improved the cleanliness factor of molten steel, and reduced the molten steel amount of tundish note in remaining, reduce more than 30% on year-on-year basis.
Furtherly, described permeable-gas ceramics rod (2) is processed into truncated cone-shaped structure, cylindrical structural than prior art, not only improve Argon Bubble closeness, improve that Argon Bubble is caught, the ability of removal of inclusions and suppress mouth of a river slag and regioselective, be that those skilled in the art gropes to obtain through long-term experiment.Meanwhile, described truncated cone-shaped structure is conducive to the mechanical extrusion molding of described permeable-gas ceramics rod (2).
Wherein permeable-gas ceramics rod (2) top stretch out filling pipe end brick cup body upper surface, bottom extend in the slot (5) on air chamber box, be beneficial to the upper of permeable-gas ceramics rod in filling pipe end brick cup moulding by casting, lower two precise positioning, to guarantee the perpendicularity of described permeable-gas ceramics rod (2) air guide, the lower end of permeable-gas ceramics rod (2) extend in the slot (5) on air chamber box simultaneously, to guarantee evenly air inlet of permeable-gas ceramics rod (2), the argon gas that this design makes to enter in air chamber box (3) forms vertically upward through permeable-gas ceramics rod (2), annular, continuous, the Argon Bubble air curtain barrier that closeness is large, improving Argon Bubble catches, the ability of removal of inclusions, control and solve tundish upper nozzle eddy current slag problem, not only to being about to enter the molten steel of tundish upper nozzle, carry out air purge, inclusion floating and removal have been promoted, improved the cleanliness factor of molten steel, and reduced the molten steel amount of tundish note in remaining, solved the permeable-gas ceramics rod precise positioning difficult problem during the cast of continuous casting tundish Argon filling pipe end brick cup is produced simultaneously, improved the qualification rate that manufactures a finished product of permeable-gas ceramics rod, by the present invention in contrast Chinese patent literature CN202291395U, brick cup at molten steel outlet is manufactured a finished product to qualification rate by original 75～80%, bring up on year-on-year basis 93～96%, and production cost reduces more than 30% on year-on-year basis.
The present invention is preferred, and the height m that described filling pipe end brick cup body (1) upper surface is stretched out in the upper end of described permeable-gas ceramics rod (2) is 5～10mm, and the interior height n of slot (5) that its lower end extend into air chamber box (3) is 5～10mm.
The present invention is preferred, the top diameter ￠ of described permeable-gas ceramics rod (2)
1be 16～18mm, its base diameter ￠
2be 19～21mm, the height H of described permeable-gas ceramics rod (2) is 90～100mm.
The present invention is preferred, and the quantity that is the permeable-gas ceramics rod (2) of annular distribution setting on each filling pipe end brick cup body (1) is 10～16, and described circle diameter ￠ is 290～330mm.
The present invention is preferred, at described air chamber box (3), be provided with the slot (5) for locating permeable-gas ceramics rod (2), air chamber box and slot thereof adopt can one-body molded, described air chamber box (3) integral body is annular, the vertical section of air chamber box is rectangle, rectangle width a be 25～35mm, height b be 15～20mm.
The present invention is preferred, and described filling pipe end brick cup body (1) profile is cylindrical, its outer diameter D
3be 360～400mm, its height h
2be 190～210mm.
The present invention is preferred, and described filling pipe end installing hole comprises the truncated cone-shaped through hole on top and the cylindrical hole of bottom, the top diameter D of the truncated cone-shaped through hole of described filling pipe end installing hole
1be 150～160mm, the truncated cone-shaped via bottoms diameter D of described filling pipe end installing hole
2be 170～180mm, the height h of the truncated cone-shaped through hole of described filling pipe end installing hole
1be 105～115mm.
The present invention is preferred, and described air inlet pipe (4), tube connector (12) are heat-resistance stainless steel pipe, and specification is 4 to be in charge of; Between described air inlet pipe (4) and tube connector (12), by rotation coupling (11), be connected, described rotation coupling (11) is for being heat-resistance stainless steel joint, and specification is M12.
The present invention is preferred, and described continuous casting tundish Argon filling pipe end brick cup body (1) adopts chrome corundum castable moulding by casting, refractoriness>=1790 ℃ of filling pipe end brick cup body (1), bulk density>=2.8g/cm
3, cold crushing strength>=60Mpa, AL in described filling pipe end brick cup body (1)
2o
3content>=93%, Cr
2o
3content is 2.0～5.0%.
The present invention is preferred, in described permeable-gas ceramics rod, is evenly equipped with gas passage.Described permeable-gas ceramics rod is that employing low-melting fiber is that raw material mechanical pressing becomes ceramic rod with fused alumina zirconia or zirconia, described low-melting fiber accounts for 0.1～0.5% of raw material total amount, and the micropore that then leaves tubulose after 1600 ℃～1700 ℃ temperature lower calcinations make low-melting fiber calcination volatilization has formed gas passage.
A kind of installation method of continuous casting tundish Argon filling pipe end brick cup, it is characterized in that, on permanent liner in pouring construction loose tool (7) sidewall, tracheae built-in fitting B is set, after the construction of tundish permanent liner in pouring, in the position of laying tracheae, form large, the interior young dovetail groove of collar extension, for laying tube connector.
An installation method for continuous casting tundish Argon filling pipe end brick cup, comprises the following steps:
1) tundish permanent liner (6) casting and constructing: first settle filling pipe end brick cup casting and constructing loose tool (8) in the position of installing pocket block, permanent liner at the bottom of employing high alumina castable cast tundish bag, it is to be cast when to air inlet pipe (4), the setting height(from bottom) x in permanent liner at the bottom of tundish bag is 120～130mm, settle tracheae built-in fitting A (9), continue cast, to completing permanent liner at the bottom of cast tundish bag; Then at the bottom of tundish bag, above permanent liner, settle permanent liner in pouring construction loose tool (7), cast tundish bag wall permanent liner, tundish permanent liner (6) moulding by casting; According to prior art, require to carry out health, baking, naturally cooling after ceasing fire, take out successively permanent liner in pouring construction loose tool (7), tracheae built-in fitting A (9);
2) according to prior art install, fixing tundish upper nozzle (13);
3) install, fixing tundish Argon filling pipe end brick cup: will on the internal chamber wall of the filling pipe end installing hole of Argon filling pipe end brick cup, smear corundum fireproof mud, from top to bottom tundish Argon filling pipe end brick cup body (1) is sleeved on the outer wall of filling pipe end (13), until be inserted in rear fixing;
4) tube connector (12) is laid, fixing: first tube connector (12) to be laid on to tracheae built-in fitting A, in the dovetail groove that tracheae built-in fitting B forms, one end of tube connector (12) is connected with the air inlet pipe (4) of tundish Argon filling pipe end brick cup by rotation coupling (11), the other end stretches out along position from the bag of tundish, again magnesian ramming mass is inserted at the bottom of filling pipe end brick cup body (1) and tundish bag in the gap between permanent liner (6), adopt ramming device evenly to vibrate, tamping, then in the dovetail groove of laying tube connector (12), smear magnesia coating, on the upper surface of tube connector (12), smear streamlining,
5) liner in dundish construction: according to prior art, adopt magnesia coating to smear liner in dundish, first smear the bag wall of liner in dundish, after smear the bag of liner in dundish at the bottom of, the upper surface of tundish underwrite lining work is 5～10mm lower than the height y of filling pipe end brick cup body (1) upper surface, so far described continuous casting tundish Argon filling pipe end brick cup installation.
The present invention is preferred, and described tracheae built-in fitting A, the cross sectional shape of tracheae built-in fitting B are trapezoidal, and sectional dimension is identical, and top width f is 20～25mm, and width e is 25～30mm below, and height c is 20～25mm; It is that the heat-resistance stainless steel plate of 20～25mm processes that described tracheae built-in fitting A, tracheae built-in fitting B all adopt thickness.
The present invention is preferred, and described filling pipe end brick cup construction loose tool (8) is selected punching block, is truncated cone-shaped, and upper end circular diameter is greater than the truncated cone-shaped of lower end circular diameter, and its upper end diameter D4 is 490～520mm, and its lower end diameter D5 is 380～460mm.
Described corundum fireproof mud, magnesian ramming mass, magnesia coating, high alumina castable are conventional raw material, commercial product.
Utilize continuous casting tundish Argon filling pipe end brick cup to carry out an argon jetting method for the filling pipe end eddy generation slag under air purge molten steel, the low liquid level condition of inhibition tundish, comprise the steps:
Before unwrapping in the middle of continuous casting and watering, by tube connector, to blowing argon gas in permeable-gas ceramics rod 20～25 seconds, the described argon pressure being blown into was controlled at 0.1～0.2MPa; Centre is unwrapped and is watered, reaches after normal cast liquid level, and argon pressure is controlled at 0.2～0.3MPa; After tundish stops watering, stop being blown into argon gas.Permeable-gas ceramics rod of the present invention, be blown into the Argon Bubble diameter forming after argon gas little (water mould measure in the diameter < 1mm of bubble) and number of bubbles is many, closeness is large, improved that Argon Bubble paving is obtained, the ability of removal of inclusions, and permeable-gas ceramics rod burns till and has higher intensity through high temperature, scour resistance is strong, and then has extended the service life of brick cup.
Beneficial effect of the present invention:
1) continuous casting tundish Argon filling pipe end brick cup of the present invention, be blown into after argon gas, at tundish upper nozzle, form annular air curtain barrier around, to being about to enter the molten steel of filling pipe end, carry out air purge, inclusion floating and removal have been promoted, control and solved the filling pipe end eddy generation slag problem under the low liquid level condition of tundish, not only improved the cleanliness factor of molten steel, and reduced the molten steel amount of tundish note in remaining, than applying Argon filling pipe end brick cup not, reduce on year-on-year basis the molten steel amount of tundish note in remaining more than 20%.
2) filling pipe end brick cup body upper surface is stretched out on the permeable-gas ceramics of tundish Argon filling pipe end brick cup of the present invention rod top, bottom puts in air chamber box, upper and lower two precise positioning for filling pipe end brick cup moulding by casting permeable-gas ceramics rod, solved the permeable-gas ceramics rod precise positioning difficult problem during the cast of tundish Argon filling pipe end brick cup is produced, improved the qualification rate that manufactures a finished product of permeable-gas ceramics rod, in application documents 2 (Chinese patent literature CN202291395U), the brick cup at molten steel outlet qualification rate 75～80% that manufactures a finished product, brings up to 93～96% on year-on-year basis.
3) installation method of continuous casting tundish Argon filling pipe end brick cup of the present invention, on permanent liner in pouring construction loose tool (7) sidewall, tracheae built-in fitting B is set, after the construction of tundish permanent liner in pouring, in the position of laying tube connector, form large, the interior young dovetail groove of collar extension, in dovetail groove, lay the method for tube connector, make tube connector accurate positioning, laying process simple.
4) installation method of continuous casting tundish Argon filling pipe end brick cup of the present invention, on permanent liner in pouring construction loose tool (7) sidewall, tracheae built-in fitting B is set, after the construction of tundish permanent liner in pouring, in the position of laying tracheae, form large, the interior young dovetail groove of collar extension, in dovetail groove, lay the method for tube connector, make the simple and easy construction of tube connector accurate positioning, laying process, solved and first poured into a mould tundish permanent liner, rear grooving and lay long, the problem such as labour intensity is large of the engineering time that tube connector causes.
5) at the bottom of air inlet pipe, the tube connector of continuous casting tundish Argon filling pipe end brick cup are laid on tundish bag, in the extexine of bag wall permanent liner, be easy to change, safeguard, be convenient to connect, adjust, solved existing tube connector and be directly embedded in material for permanent liner in pouring, change tube connector and must remove the technical barrier of tundish permanent liner.
Accompanying drawing explanation
Fig. 1 is continuous casting tundish Argon filling pipe end brick cup structure cross-sectional schematic in the embodiment of the present invention.
Fig. 2 is continuous casting tundish Argon filling pipe end brick cup structure schematic top plan view in the embodiment of the present invention.
Fig. 3 is permeable-gas ceramics bar structure schematic diagram in the embodiment of the present invention.
Fig. 4 is air chamber box structural representation in the embodiment of the present invention.
Fig. 5 is continuous casting tundish permanent liner constructing structure schematic diagram in the embodiment of the present invention.
Fig. 6 is the generalized section of tracheae built-in fitting A or tracheae built-in fitting B in the embodiment of the present invention.
Fig. 7 is purging upper nozzle for continuous casting tundish brick cup mounting structure schematic diagram in the embodiment of the present invention.
In figure, 1, filling pipe end brick cup body; 2, permeable-gas ceramics rod; 3, air chamber box; 4, air inlet pipe; 5, the slot on air chamber box; 6, tundish permanent liner; 7, permanent liner in pouring construction loose tool; 8, filling pipe end brick cup casting and constructing loose tool; 9, tracheae built-in fitting A; 10, tracheae built-in fitting B; 11, rotation coupling; 12, tube connector; 13, filling pipe end; 14, ramming mass; 15, liner in dundish.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further described, but be not limited only to this.
In embodiment, corundum fireproof mud, magnesian ramming mass, magnesia coating, high alumina castable are conventional raw material, commercial product.
Corundum fireproof mud is purchased from Shanghai BaoMing fireresisting Materials Co., Ltd.
Magnesian ramming mass is purchased from Shanghai BaoMing fireresisting Materials Co., Ltd.
Magnesia coating is purchased from Laigang emerging Ye Qi Co., Ltd.
High alumina castable is purchased from Laigang emerging Ye Qi Co., Ltd.
Embodiment 1:
As shown in Figure 1, Figure 2, Figure 3, Figure 4:
A kind of continuous casting tundish Argon filling pipe end brick cup, comprise filling pipe end brick cup body 1, permeable-gas ceramics rod 2, air chamber box 3, air inlet pipe 4, the middle part of described filling pipe end brick cup body 1 is provided with the filling pipe end installing hole running through up and down, in described filling pipe end brick cup body 1, be provided with a plurality of permeable-gas ceramicses rods 2 that annular is evenly arranged and the air chamber box 3 of annular, described air chamber box is positioned at the bottom of permeable-gas ceramics rod and is communicated with permeable-gas ceramics rod, the sidepiece of air chamber box 3 is connected with air inlet pipe 4, one end of described air inlet pipe is connected to the sidepiece of air chamber box 3, the other end passes with outside tube connector 12 and is connected from the sidepiece of filling pipe end brick cup body 1, it is characterized in that, described permeable-gas ceramics rod 2 is truncated cone-shaped, and its top diameter is less than base diameter, on described air chamber box 3, be provided with a plurality of slots 5 that annular is evenly arranged, the shape of described slot, quantity, layout are corresponding with described permeable-gas ceramics rod 2, the upper surface of described filling pipe end brick cup body 1 is stretched out on the top of described permeable-gas ceramics rod 2, and the lower end of described permeable-gas ceramics rod 2 extend in the slot 5 on air chamber box.
The height m that described filling pipe end brick cup body 1 upper surface is stretched out in the upper end of described permeable-gas ceramics rod 2 is 5mm, and the height n that its lower end extend in air chamber box 3 is 5mm.
The top diameter ￠ of described permeable-gas ceramics rod 2
1for 16mm, its base diameter ￠
2for 19mm, the height H of described permeable-gas ceramics rod 2 is 90mm.
The quantity that is the permeable-gas ceramics rod 2 of annular distribution setting on each filling pipe end brick cup body 1 is 10, and described circle diameter ￠ is 290mm.
At described air chamber box 3, be provided with for locating the slot 5 of permeable-gas ceramics rod 2, air chamber box and slot thereof adopt can one-body molded, and described air chamber box 3 integral body are annular, and the vertical section of air chamber box is rectangle, rectangle width a be 25mm, highly b is 15mm.
Described filling pipe end brick cup body 1 profile is cylindrical, its outer diameter D
3for 360mm, its height h
2for 210mm.
Described filling pipe end installing hole comprises the truncated cone-shaped through hole on top and the cylindrical hole of bottom, the top diameter D of the truncated cone-shaped through hole of described filling pipe end installing hole
1for 154mm, the truncated cone-shaped via bottoms diameter D of described filling pipe end installing hole
2for 176mm, the height h of the truncated cone-shaped through hole of described filling pipe end installing hole
1for 105mm.
Described air inlet pipe 4, tube connector 12 are heat-resistance stainless steel pipe, and specification is 4 to be in charge of; Between described air inlet pipe 4 and tube connector 12, by rotation coupling 11, be connected, described rotation coupling 11 is for being heat-resistance stainless steel joint, and specification is M12.
Described continuous casting tundish Argon filling pipe end brick cup body 1, adopts chrome corundum castable moulding by casting, refractoriness>=1790 ℃ of filling pipe end brick cup body (1), bulk density>=2.8g/cm
3, cold crushing strength>=60Mpa, AL in described filling pipe end brick cup body (1)
2o
3content>=93%, Cr
2o
3content is 2.0～5.0%.
In described permeable-gas ceramics rod, be evenly equipped with gas passage.Described permeable-gas ceramics rod is that employing low-melting fiber is that raw material mechanical pressing becomes ceramic rod with fused alumina zirconia or zirconia, described low-melting fiber accounts for 0.1～0.5% of raw material total amount, and the micropore that then leaves tubulose after 1600 ℃～1700 ℃ temperature lower calcinations make low-melting fiber calcination volatilization has formed gas passage.
Embodiment 2,
A continuous casting tundish Argon filling pipe end brick cup as described in Example 1, its difference is, and the height m that filling pipe end brick cup body 1 upper surface is stretched out in the upper end of permeable-gas ceramics rod 2 is 10mm, and the height n that its lower end extend in the slot 5 on air chamber box is 5mm.
The upper round platform diameter ￠ of permeable-gas ceramics rod 2
1for 18mm, lower round platform diameter ￠
2for 21mm,, the height H of permeable-gas ceramics rod is 100mm.
Permeable-gas ceramics rod 2 is 16, is annular and is evenly arranged, and circle diameter ￠ is 330mm.
Described air chamber box 3 vertical sections are rectangle, and width a is 35mm, and height b is 20mm.
Filling pipe end brick cup body 1 profile is cylindrical, outer diameter D
3for 400mm, height h
2for 190mm.
Embodiment 3,
A continuous casting tundish Argon filling pipe end brick cup as described in Example 1, its difference is, and the height m that pocket block body upper surface is stretched out in the upper end of permeable-gas ceramics rod 2 is 15mm, and the height n that its lower end extend in the slot 5 of air chamber box is 10mm.
The upper round platform diameter ￠ of permeable-gas ceramics rod 2
1for 18mm, lower round platform diameter ￠
2for 20mm,, the height H of permeable-gas ceramics rod is 95mm.
Permeable-gas ceramics rod 2 is 12, is annular and is evenly arranged, and circle diameter ￠ is 320mm.
Described air chamber box 3 vertical sections are rectangle, and width a is 30mm, height b be 20mm.
Filling pipe end brick cup body 1 profile is cylindrical, outer diameter D
3for 380mm, height h
2for 203mm.
Embodiment 4,
A kind of as described in embodiment 1-3 the installation method of continuous casting tundish Argon filling pipe end brick cup, it is characterized in that, on permanent liner in pouring construction loose tool 7 sidewalls, tracheae built-in fitting B is set, after the construction of tundish permanent liner in pouring, in the position of laying tracheae, form large, the interior young dovetail groove of collar extension, for laying tube connector.
Embodiment 5,
An installation method for continuous casting tundish Argon filling pipe end brick cup as described in embodiment 1-3, comprises the following steps:
1) tundish permanent liner 6 casting and constructings: first settle filling pipe end brick cup casting and constructing loose tool 8 in the position of installing pocket block, permanent liner at the bottom of employing high alumina castable cast tundish bag, it is to be cast when to air inlet pipe 4, the setting height(from bottom) x in permanent liner at the bottom of tundish bag is 120～130mm, settle tracheae built-in fitting A9, continue cast, to completing permanent liner at the bottom of cast tundish bag; Then at the bottom of tundish bag, above permanent liner, settle permanent liner in pouring construction loose tool 7, cast tundish bag wall permanent liner, tundish permanent liner 6 moulding by casting; According to prior art, require to carry out health, baking, naturally cooling after ceasing fire, take out successively permanent liner in pouring construction loose tool 7, tracheae built-in fitting A9;
2) according to prior art install, fixing tundish upper nozzle (13);
3) install, fixing tundish Argon filling pipe end brick cup: will on the internal chamber wall of the filling pipe end installing hole of Argon filling pipe end brick cup, smear corundum fireproof mud, from top to bottom tundish Argon filling pipe end brick cup body 1 is sleeved on the outer wall of filling pipe end 13, until be inserted in rear fixing;
4) tube connector 12 is laid, is fixed: first tube connector 12 is laid in the dovetail groove of tracheae built-in fitting A, tracheae built-in fitting B formation, one end of tube connector 12 is connected with the air inlet pipe 4 of tundish Argon filling pipe end brick cup by rotation coupling 11, the other end stretches out along position from the bag of tundish, again magnesian ramming mass is inserted at the bottom of filling pipe end brick cup body 1 and tundish bag in the gap between permanent liner 6, employing ramming device evenly vibrates, tamping, then in the dovetail groove of laying tube connector 12, smear magnesia coating, on the upper surface of tube connector 12, smear streamlining;
5) liner in dundish construction: according to prior art, adopt magnesia coating to smear liner in dundish, first smear the bag wall of liner in dundish, after smear the bag of liner in dundish at the bottom of, the upper surface of tundish underwrite lining work is 10mm lower than the height y of filling pipe end brick cup body (1) upper surface, so far described continuous casting tundish Argon filling pipe end brick cup installation.
Described tracheae built-in fitting A, the cross sectional shape of tracheae built-in fitting B are trapezoidal, and sectional dimension is identical, and top width f is 20mm, and width e is 25mm below, and height c is 20mm; It is that the heat-resistance stainless steel plate of 20mm processes that described tracheae built-in fitting A, tracheae built-in fitting B all adopt thickness.
Described filling pipe end brick cup construction loose tool 8 is selected punching block, is truncated cone-shaped, and upper end circular diameter is greater than the truncated cone-shaped of lower end circular diameter, and its upper end diameter D4 is 490mm, and its lower end diameter D5 is 390mm.
Embodiment 6,
An installation method for continuous casting tundish Argon filling pipe end brick cup as described in Example 5, comprises the following steps:
1) tundish permanent liner 6 casting and constructings: first settle filling pipe end brick cup casting and constructing loose tool 8 in the position of installing pocket block, permanent liner at the bottom of employing high alumina castable cast tundish bag, it is to be cast when to air inlet pipe 4, the setting height(from bottom) x in permanent liner at the bottom of tundish bag is 125mm, settle tracheae built-in fitting A9, continue cast, to completing permanent liner at the bottom of cast tundish bag; Then at the bottom of tundish bag, above permanent liner, settle permanent liner in pouring construction loose tool 7, cast tundish bag wall permanent liner, tundish permanent liner 6 moulding by casting; According to prior art, require to carry out health, baking, naturally cooling after ceasing fire, take out successively permanent liner in pouring construction loose tool 7, tracheae built-in fitting A9;
2) according to prior art install, fixing tundish upper nozzle 13;
3) install, fixing tundish Argon filling pipe end brick cup: will on the internal chamber wall of the filling pipe end installing hole of Argon filling pipe end brick cup, smear corundum fireproof mud, from top to bottom tundish Argon filling pipe end brick cup body 1 is sleeved on the outer wall of filling pipe end 13, until be inserted in rear fixing;
4) tube connector 12 is laid, is fixed: first tube connector 12 is laid in the dovetail groove of tracheae built-in fitting A, tracheae built-in fitting B formation, one end of tube connector 12 is connected with the air inlet pipe 4 of tundish Argon filling pipe end brick cup by rotation coupling 11, the other end stretches out along position from the bag of tundish, again magnesian ramming mass is inserted at the bottom of filling pipe end brick cup body (1) and tundish bag in the gap between permanent liner 6, employing ramming device evenly vibrates, tamping, then in the dovetail groove of laying tube connector 12, smear magnesia coating, on the upper surface of tube connector 12, smear streamlining;
5) liner in dundish construction: according to prior art, adopt magnesia coating to smear liner in dundish, first smear the bag wall of liner in dundish, after smear the bag of liner in dundish at the bottom of, the upper surface of tundish underwrite lining work is 5mm lower than the height y of filling pipe end brick cup body 1 upper surface, so far described continuous casting tundish Argon filling pipe end brick cup installation.
Described tracheae built-in fitting A, the cross sectional shape of tracheae built-in fitting B are trapezoidal, and sectional dimension is identical, and top width f is 25mm, and width e is 30mm below, and height c is 25mm; It is that the heat-resistance stainless steel plate of 25mm processes that described tracheae built-in fitting A, tracheae built-in fitting B all adopt thickness.
Embodiment 7,
Utilize continuous casting tundish Argon filling pipe end brick cup described in embodiment 1 to carry out air purge molten steel, suppress the argon jetting method of the filling pipe end eddy generation slag under the low liquid level condition of tundish, comprise the steps:
Before unwrapping in the middle of continuous casting and watering, by tube connector, to blowing argon gas in permeable-gas ceramics rod 20～25 seconds, the described argon pressure being blown into was controlled at 0.1～0.2MPa; Centre is unwrapped and is watered, reaches after normal cast liquid level, and argon pressure is controlled at 0.2～0.3MPa; After tundish stops watering, stop being blown into argon gas.Permeable-gas ceramics rod of the present invention, be blown into the Argon Bubble diameter forming after argon gas little (water mould measure in the diameter < 1mm of bubble) and number of bubbles is many, closeness is large, improved that Argon Bubble paving is obtained, the ability of removal of inclusions, and permeable-gas ceramics rod burns till and has higher intensity through high temperature, scour resistance is strong, and then has extended the service life of brick cup.
Contrast experiment's example:
Adopt the disclosed a kind of brick cup at molten steel outlet of Chinese patent literature CN202291395U experimental example as a comparison.
The production cost of the pocket block of the pocket block of embodiment 1-2 and experimental example and tube connector laying method are contrasted, pocket block of the present invention manufactures a finished product, and rate is high, production cost is low, and the tube connector laying process of pocket block of the present invention is simple, accurate positioning, easy construction.Adopt the pocket block of embodiment of the present invention 1-2 and the pocket block of contrast experiment's example to be applied on Laiwu steel enterprise Yin Shan shaped steel Co., Ltd steel mill slab caster tundish, under equal process conditions, the tundish Argon filling pipe end brick cup of application embodiment of the present invention 1-2, molten steel amount control experiment example during tundish note is remaining reduces more than 32% on year-on-year basis, pocket block life-span control experiment example improves 11 heats on year-on-year basis, 12 heats, in the LHG2 steel of producing, field trash still less, in LHG2 steel Control and Inclusion Removal in the ratio below 1.5 grades by 91.62% bringing up to more than 93.26% of applying comparative example 1.Comparing result is in Table 1.
Table 1
Claims (10)
1. a continuous casting tundish Argon filling pipe end brick cup, comprise filling pipe end brick cup body (1), permeable-gas ceramics rod (2), air chamber box (3), air inlet pipe (4), the middle part of described filling pipe end brick cup body (1) is provided with the filling pipe end installing hole running through up and down, in described filling pipe end brick cup body (1), be provided with a plurality of permeable-gas ceramicses rods (2) that annular is evenly arranged and the air chamber box (3) of annular, described air chamber box is positioned at the bottom of permeable-gas ceramics rod and is communicated with permeable-gas ceramics rod, the sidepiece of air chamber box (3) is connected with air inlet pipe (4), one end of described air inlet pipe is connected to the sidepiece of air chamber box (3), the other end passes with outside tube connector (12) and is connected from the sidepiece of filling pipe end brick cup body (1), it is characterized in that, described permeable-gas ceramics rod (2) is truncated cone-shaped, and its top diameter is less than base diameter, on described air chamber box (3), be provided with a plurality of slots (5) that annular is evenly arranged, the shape of described slot, quantity, layout are corresponding with described permeable-gas ceramics rod (2), the upper surface of described filling pipe end brick cup body (1) is stretched out on the top of described permeable-gas ceramics rod (2), and the lower end of described permeable-gas ceramics rod (2) extend in the slot (5) on air chamber box.
2. a kind of continuous casting tundish Argon filling pipe end brick cup according to claim 1, it is characterized in that, the height m that described filling pipe end brick cup body (1) upper surface is stretched out in the upper end of described permeable-gas ceramics rod (2) is 5～10mm, and the interior height n of slot (5) that its lower end extend into air chamber box (3) is 5～10mm; The top diameter ￠ of described permeable-gas ceramics rod (2)
1be 16～18mm, its base diameter ￠
2be 19～21mm, the height H of described permeable-gas ceramics rod (2) is 90～100mm.
3. a kind of continuous casting tundish Argon filling pipe end brick cup according to claim 1, it is characterized in that, the quantity that is the permeable-gas ceramics rod (2) of annular distribution setting on each filling pipe end brick cup body (1) is 10～16, and described circle diameter ￠ is 290～330mm; At described air chamber box (3), be provided with the slot (5) for locating permeable-gas ceramics rod (2), air chamber box and slot thereof adopt can one-body molded, described air chamber box (3) integral body is annular, the vertical section of air chamber box is rectangle, rectangle width a be 25～35mm, height b be 15～20mm.
4. a kind of continuous casting tundish Argon filling pipe end brick cup according to claim 1, is characterized in that, described filling pipe end brick cup body (1) profile is cylindrical, its outer diameter D
3be 360～400mm, its height h
2be 190～210mm; Described filling pipe end installing hole comprises the truncated cone-shaped through hole on top and the cylindrical hole of bottom, the top diameter D of the truncated cone-shaped through hole of described filling pipe end installing hole
1be 150～160mm, the truncated cone-shaped via bottoms diameter D of described filling pipe end installing hole
2be 170～180mm, the height h of the truncated cone-shaped through hole of described filling pipe end installing hole
1be 105～115mm.
5. a kind of continuous casting tundish Argon filling pipe end brick cup according to claim 1, is characterized in that, described air inlet pipe (4), tube connector (12) are heat-resistance stainless steel pipe, and specification is 4 to be in charge of; Between described air inlet pipe (4) and tube connector (12), by rotation coupling (11), be connected, described rotation coupling (11) is for being heat-resistance stainless steel joint, and specification is M12.
6. a kind of continuous casting tundish Argon filling pipe end brick cup according to claim 1, it is characterized in that, described continuous casting tundish Argon filling pipe end brick cup body (1), adopt chrome corundum castable moulding by casting, refractoriness>=1790 ℃ of filling pipe end brick cup body (1), bulk density>=2.8g/cm
3, cold crushing strength>=60Mpa, AL in described filling pipe end brick cup body (1)
2o
3content>=93%, Cr
2o
3content is 2.0～5.0%; In described permeable-gas ceramics rod, be evenly equipped with gas passage.
7. the installation method of continuous casting tundish Argon filling pipe end brick cup as claimed in claim 1, it is characterized in that, on permanent liner in pouring construction loose tool (7) sidewall, tracheae built-in fitting B is set, after the construction of tundish permanent liner in pouring, in the position of laying tracheae, form large, the interior young dovetail groove of collar extension, for laying tube connector.
8. an installation method for continuous casting tundish Argon filling pipe end brick cup as claimed in claim 1, is characterized in that, comprises the following steps:
1) tundish permanent liner (6) casting and constructing: first settle filling pipe end brick cup casting and constructing loose tool (8) in the position of installing pocket block, permanent liner at the bottom of employing high alumina castable cast tundish bag, it is to be cast when to air inlet pipe (4), the setting height(from bottom) x in permanent liner at the bottom of tundish bag is 120～130mm, settle tracheae built-in fitting A (9), continue cast, to completing permanent liner at the bottom of cast tundish bag; Then at the bottom of tundish bag, above permanent liner, settle permanent liner in pouring construction loose tool (7), cast tundish bag wall permanent liner, tundish permanent liner (6) moulding by casting; According to prior art, require to carry out health, baking, naturally cooling after ceasing fire, take out successively permanent liner in pouring construction loose tool (7), tracheae built-in fitting A (9);
2) according to prior art install, fixing tundish upper nozzle (13);
3) install, fixing tundish Argon filling pipe end brick cup: will on the internal chamber wall of the filling pipe end installing hole of Argon filling pipe end brick cup, smear corundum fireproof mud, from top to bottom tundish Argon filling pipe end brick cup body (1) is sleeved on the outer wall of filling pipe end (13), until be inserted in rear fixing;
4) tube connector (12) is laid, fixing: first tube connector (12) to be laid on to tracheae built-in fitting A, in the dovetail groove that tracheae built-in fitting B forms, one end of tube connector (12) is connected with the air inlet pipe (4) of tundish Argon filling pipe end brick cup by rotation coupling (11), the other end stretches out along position from the bag of tundish, again magnesian ramming mass is inserted at the bottom of filling pipe end brick cup body (1) and tundish bag in the gap between permanent liner (6), adopt ramming device evenly to vibrate, tamping, then in the dovetail groove of laying tube connector (12), smear magnesia coating, on the upper surface of tube connector (12), smear streamlining,
5) liner in dundish construction: according to prior art, adopt magnesia coating to smear liner in dundish, first smear the bag wall of liner in dundish, after smear the bag of liner in dundish at the bottom of, the upper surface of tundish underwrite lining work is 5～10mm lower than the height y of filling pipe end brick cup body (1) upper surface, so far described continuous casting tundish Argon filling pipe end brick cup installation.
9. the installation method of described continuous casting tundish Argon filling pipe end brick cup as claimed in claim 8, it is characterized in that, described tracheae built-in fitting A, the cross sectional shape of tracheae built-in fitting B are trapezoidal, sectional dimension is identical, top width f is 20～25mm, width e is 25～30mm below, and height c is 20～25mm; It is that the heat-resistance stainless steel plate of 20～25mm processes that described tracheae built-in fitting A, tracheae built-in fitting B all adopt thickness; Described filling pipe end brick cup construction loose tool (8) is selected punching block, is truncated cone-shaped, and upper end circular diameter is greater than the truncated cone-shaped of lower end circular diameter, and its upper end diameter D4 is 490～520mm, and its lower end diameter D5 is 380～460mm.
10. utilize continuous casting tundish Argon filling pipe end brick cup as described in Example 1 to carry out air purge molten steel, suppress the argon jetting method of the filling pipe end eddy generation slag under the low liquid level condition of tundish, comprise the steps:
Before unwrapping in the middle of continuous casting and watering, by tube connector, to blowing argon gas in permeable-gas ceramics rod 20～25 seconds, the described argon pressure being blown into was controlled at 0.1～0.2MPa; Centre is unwrapped and is watered, reaches after normal cast liquid level, and argon pressure is controlled at 0.2～0.3MPa; After tundish stops watering, stop being blown into argon gas.
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| CN107214327A (en) * | 2017-07-14 | 2017-09-29 | 山东钢铁股份有限公司 | A kind of continuous casting production bar shaped air curtain barricade wall and its installation method |
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| CN109108240A (en) * | 2018-10-31 | 2019-01-01 | 武汉科技大学 | A kind of continuous casting production air swirl filling pipe end brick cup |
| CN109759575B (en) * | 2019-02-20 | 2023-08-25 | 山东钢铁股份有限公司 | Annular gas curtain wall for steel ladle and argon blowing metallurgical method thereof |
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| CN109719289A (en) * | 2019-03-06 | 2019-05-07 | 山东钢铁股份有限公司 | A kind of continuous casting production and its tundish brick cup |
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| CN113492209A (en) * | 2020-03-19 | 2021-10-12 | 中冶宝钢技术服务有限公司 | Fire clay thickness control device and process for tundish water feeding port |
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| CN111822690A (en) * | 2020-07-25 | 2020-10-27 | 莱芜钢铁集团银山型钢有限公司 | Ladle argon blowing upper nozzle pocket brick and preparation method thereof |
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