CN106735143B - A kind of application method of IF steel tundish - Google Patents

A kind of application method of IF steel tundish Download PDF

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Publication number
CN106735143B
CN106735143B CN201611078033.3A CN201611078033A CN106735143B CN 106735143 B CN106735143 B CN 106735143B CN 201611078033 A CN201611078033 A CN 201611078033A CN 106735143 B CN106735143 B CN 106735143B
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steel
dam
tundish
pod apertures
molten steel
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CN106735143A (en
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朱正海
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Maanshan Shangyuan Metallurgical Technology Co Ltd
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Maanshan Shangyuan Metallurgical Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10Supplying or treating molten metal
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/057Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on calcium oxide
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66Monolithic refractories or refractory mortars, including those whether or not containing clay
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/004Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3262Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38Non-oxide ceramic constituents or additives
    • C04B2235/3817Carbides
    • C04B2235/3826Silicon carbides
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    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/38Non-oxide ceramic constituents or additives
    • C04B2235/3852Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
    • C04B2235/386Boron nitrides

Abstract

The invention discloses a kind of application method of IF steel tundish, belongs to Ferrous Metallurgy continuous casting production technology field.The application method of the IF steel tundish of the present invention, comprises the following steps:(1) molten steel injects:When continuous casting normally produces, IF steel molten steel is collected in the region that dam surrounds;(2) lasting cast:The liquid level of IF steel molten steel is more than the height of dam in tundish body, and IF steel molten steel flows out from middle water containing opening;(3) latter stage is poured into a mould:Stop the injection of IF steel molten steel, the liquid level of IF steel molten steel is gradually reduced in tundish body, and when the liquid level of IF steel molten steel in tundish body is less than the height of dam, the IF steel molten steel of residual is flowed out by pod apertures in the region that dam surrounds;(4) casting complete:By clogging of tundish nozzle, casting complete.The present invention is adapted to production IF steel and can significantly reduce molten steel note surplus.

Description

A kind of application method of IF steel tundish
Present patent application is to be directed to Application No.:2016101893262 divisional application, the applying date of original application For:2016-03-28, invention and created name are:A kind of IF steel tundish.
Technical field
The present invention relates to a kind of tundish for being used to produce IF steel, more specifically to a kind of making for IF steel tundish With method, belong to Ferrous Metallurgy continuous casting production technology field.
Background technology
IF steel, full name Interstitial-Free Steel, i.e. gapless atomic steel, sometimes referred to as ultra-low-carbon steel, has Extremely excellent deep drawability, elongation and r values can obtain extensively respectively up to 50% and more than 2.0 in auto industry at present Using.In IF steel, because C, N content are low, add the strong carboritride such as a certain amount of titanium (Ti), niobium (Nb) and form member Element, the interstitial atoms such as the carbon in ultra-low-carbon steel, nitrogen are completely fixed for carboritride, gap-free atom is clean obtained from Net ferritic steel, as Ultra-low carbon gapless atomic steel (Interstitial Free Steel).
Tundish is the refractory material containers used in smelter STEELMAKING PRODUCTION flow, receives to pour from ladle first The molten steel to get off, then it is assigned to again by middle water containing opening in each crystallizer.Flow control is set to fill in continuous casting tundish Put, to change the running route of molten steel in tundish, extend residence time of the molten steel in tundish, have and promote on field trash Floating mat removes, and reduces strand inner inclusion, changes the metallurgical function of inclusion morphology.With the development of metallurgical technology, in tundish Metallurgical method be continuously developed.Such as patent publication No.:The Y of CN 2936498, publication date:On August 22nd, 2007, invention wound Make entitled:A kind of slag blocking dam of middle ladle, this application case disclose a kind of slag blocking dam of middle ladle, and the dam is without pod apertures, outside Column is seen into, side arcwall face, opposite side is plane, hollow, and whole shape is in " Kei-shaped ", is made up of magnesia refractories, Circular or curved wall apparent height is the 1/2~2/3 of tundish head room;The dam is simply easily made, and cost is cheap, can have Effect improves slab quality;But conventional art is concentrated mainly on continuous casting normal productive process, the research for continuous casting latter stage Seldom, this application case is not just because of taking into full account continuous casting latter stage so that tundish cast latter stage molten steel residual volume compared with It is more, and then make it that molten steel recovery rate is low, economic benefit is bad.
In recent years, technical staff starts the cast latter stage of gradually concern continuous casting, such as patent publication No.:CN 103302259 A, publication date:On September 18th, 2013, invention and created name are:A kind of continuous casting production dam and its preparation Method, this application case are related to a kind of continuous casting production dam and preparation method thereof, two water conservancy diversion of continuous casting production dam Hole is symmetrical arranged relative to dam body longitudinal centre line, and the pod apertures center of circle is respectively positioned at longitudinal centre line or so 1/4~3/8 Place, and the pod apertures center of circle is located at 1/8~1/4 above dam body cross central line, the axial line positive pitch β of pod apertures For 15 °~20 °;The continuous casting production dam service life length of this application case, while by convincing discharge orifice reality by patient analysis on dam The molten steel residual volume in cast latter stage is now reduced, so as to improve molten steel recovery rate, increases economic benefit.But such dam is opened The tundish of pod apertures is only capable of using when the quality of production requires in general steel grade, because general steel grade is to field trash size sum Amount is not strict with, but (this steel grade requires higher to field trash in strand, and field trash equivalent diameter typically will when production IF steel Ask and be necessarily less than 100 μm) when, then it can not use such tundish;And add tundish using the dam without pod apertures Note surplus, molten steel recovery rate is low, has raised the steel technology of continuous casting billet, has added production cost.
In summary, how to design a kind of suitable production IF steel and significantly reduce the tundish of molten steel note surplus, be existing There is the technical barrier of urgent need to resolve in technology.
The content of the invention
1. invention technical problems to be solved
It is an object of the invention to overcome the IF steel that purity requirements are high in the prior art to be noted in continuous casting latter stage molten steel The problem of surplus is higher, there is provided a kind of application method of IF steel tundish, be adapted to production IF steel and molten steel note can be significantly reduced Surplus.
2. technical scheme
To reach above-mentioned purpose, technical scheme provided by the invention is:
The IF steel tundish of the present invention, including tundish body, the tundish body is interior to be provided with middle water containing opening and pushing off the slag Dam, the middle water containing opening are located at tundish body bottom portion, and the dam is surrounded in tundish body and middle water containing opening The region separated, and dam surrounds the bottom in region and is connected with middle water containing opening.
IF steel tundish as the present invention further improves, and the bottom that dam surrounds region is provided with pad level, Pod apertures are provided with the pad level, the bottom that the pod apertures surround dam in region is connected with middle water containing opening.
IF steel tundish as the present invention further improves, and the pod apertures are to include vertical section and horizontal segment " L " shape through hole, the bottom that the pod apertures vertical section surrounds region with dam connect, and pod apertures horizontal segment is close to tundish body Bottom is set, and pod apertures horizontal segment connects with middle water containing opening;The junction of pod apertures vertical section and horizontal segment connects for circular arc Connect.
IF steel tundish as the present invention further improves, and the pod apertures have two groups, two groups of pod apertures on Same middle water containing opening is symmetrical arranged, and every group of pod apertures comprise at least a pod apertures.
IF steel tundish as the present invention further improves, and the middle water containing opening has two, and two centres Water-coating port surrounds the both sides in region positioned at dam respectively;The pod apertures have two groups, and two groups of pod apertures are respectively by dam Surround region bottom it is corresponding with two middle water containing openings be connected, every group of pod apertures comprise at least a pod apertures.
IF steel tundish as the present invention further improves, and includes suppression whirlpool device one, pod apertures vertical section and The interface both sides that dam surrounds the bottom in region are respectively equipped with a suppression whirlpool device one, and the suppression whirlpool device one is to include erecting Straight section and " umbrella " the shape structure in vertical section top umbrella cover portion, and the angle in straight line and umbrella cover portion where the vertical section be 120 °~ 180°。
IF steel tundish as the present invention further improves, in addition to suppression whirlpool device two, the suppression whirlpool device two For rectangular block, suppression whirlpool device two surrounds the interface side of the bottom in region positioned at pod apertures vertical section with dam, and presses down whirlpool One end of device two contacts with dam medial surface, and the other end of suppression whirlpool device two does not cover the interface;
Suppression whirlpool device two is made up of the refractory material of following mass percent:0.1~6.6%SiC, 0.1~4.5%BN, 85~92%CaO, 3.5~7.3%MnO, 0.1~1.9%Al2O3,0.1~5.3%SiO2,1.4~5.6%ZrO2;Wherein, The manufacture method for pressing down whirlpool device two is as follows:
(1) it after above-mentioned refractory material dispensing, will add in batch mixer dry-mixed 5~10 minutes, then add and account for refractory material The water of gross weight 6.9~7.5%, wet mixing 10~15 minutes;
(2) the good material of wet mixing is put into loose tool, in charging with vibrating head vibration moulding, the green compact of suppression whirlpool device two Manufacture is completed, and green compact are conserved into 24~30h at a temperature of 5~30 DEG C;
(3) toast and cool down, be divided into the next stage:150 are warming up to from 5~30 DEG C of programming rates with 25~30 DEG C/h~ 8~9h is incubated after 180 DEG C;10~12h is incubated after being warming up to 300~320 DEG C again with 25~30 DEG C/h programming rate;Again with 25 ~30 DEG C/h programming rate is incubated 12~15h after being warming up to 550~575 DEG C;30~35h of last natural cooling, presses down whirlpool device Two manufactures are completed.
IF steel tundish as the present invention further improves, and dam surrounds at least three in tundish body The region separated with middle water containing opening, and the bottom in region that each dam surrounds is by pod apertures and tundish water Mouth is connected.
The manufacture method of the IF steel tundish of the present invention, comprises the following steps:
(1) three-dimensional modeling:The 3-D geometric model of pod apertures is drawn using 3 d modeling software;
(2) 3D printing:The 3-D geometric model of pod apertures is inputted to 3D printer, 3D printing goes out the bend pipe of ABS materials, The physical dimension of the bend pipe and pod apertures matches;
(3) bend pipe is installed:During IF steel tundish is built by laying, the bend pipe is embedded in pad level;
(4) dam is installed:Dam is attached in tundish body;
(5) water conservancy diversion hole forming:IF steel tundish is toasted, the bend pipe heated combustion of ABS materials disappears in baking process Lose, the satisfactory pod apertures of physical dimension are formed in pad level.
The application method of the IF steel tundish of the present invention, comprises the following steps:
(1) molten steel injects:When continuous casting normally produces, IF steel molten steel is injected into the area that dam surrounds in tundish body Domain, IF steel molten steel are collected in the region that dam surrounds;Wherein, the IF steel molten steel includes the member of following mass percent Element:0.001~0.003%C, 0.011~0.025%Si, 0.11~0.19%Mn, 0.003~0.006%P, 0.003~ 0.007%S, 0.0015~0.0040%N;
(2) lasting cast:With the lasting injection of IF steel molten steel, the liquid level of IF steel molten steel is more than pushing off the slag in tundish body The height on dam, IF steel molten steel flow out from middle water containing opening;
(3) latter stage is poured into a mould:Stopping the injection of IF steel molten steel, the liquid level of IF steel molten steel gradually reduces in tundish body, when When the liquid level of IF steel molten steel is less than the height of dam in tundish body, the IF steel molten steel of residual in the region that dam surrounds Flowed out by pod apertures;
(4) casting complete:, will when the IF steel molten steel liquid levels remained in the region that dam surrounds drop to certain altitude Clogging of tundish nozzle, casting complete;Wherein, field trash equivalent diameter is less than 100 μm in strand after continuous casting.
3. beneficial effect
Using technical scheme provided by the invention, compared with prior art, there is following remarkable result:
(1) IF steel tundish of the invention, " L " shape pod apertures can not directly impact middle water containing opening region molten steel liquid Under conditions of face, molten steel is emptied to greatest extent, and " umbrella " shape suppression whirlpool device one can prevent field trash from entering molten steel inside ensuring Molten Steel Cleanliness, the two synergy, the purpose that molten steel note surplus is reduced under conditions of Molten Steel Cleanliness is ensured is can be only achieved, Meet the quality requirement of IF steel, realize the target of increase Business Economic Benefit.
(2) IF steel tundish of the invention, two pod apertures are symmetrically disposed in the both sides of same middle water containing opening, from And enabling molten steel symmetrically to flow into same middle water containing opening by two pod apertures respectively, symmetrically arranged pod apertures can disappear Except the deficiency for setting single pod apertures to be easily formed about bottom vortex in middle water containing opening, slag can be effectively avoided.
(3) because the structure of pod apertures is special, using traditional handicraft it is difficult to ensure that the dimensional accuracy of pod apertures, and then influence The using effect of IF steel tundish, and the manufacture method of the IF steel tundish by the present invention, can accurately control pod apertures Dimensional accuracy, so that it is guaranteed that IF steel tundish produced by the present invention effectively uses.
Brief description of the drawings
Fig. 1 is the main cross section structure diagram of the IF steel tundish of embodiment 1;
Fig. 2 is the left view structural representation of the IF steel tundish of embodiment 2;
Fig. 3 is the main cross section structure diagram of the IF steel tundish of embodiment 3;
Fig. 4 is the main cross section structure diagram of the IF steel tundish of embodiment 4;
Fig. 5 is the main cross section structure diagram of the IF steel tundish of embodiment 5;
Fig. 6 is the main cross section structure diagram of the IF steel tundish of embodiment 6;
Fig. 7 is the main cross section structure diagram of the IF steel tundish of embodiment 7;
Fig. 8 is the FB(flow block) of the manufacture method of the IF steel tundish of embodiment 8;
Fig. 9 is the FB(flow block) of the application method of the IF steel tundish of embodiment 9.
Label declaration in schematic diagram:
1st, tundish body;101st, dam;102nd, pad level;103rd, tundish body bottom portion;104th, middle water containing opening; 105th, pod apertures;106th, whirlpool device one is pressed down;107th, whirlpool device two is pressed down.
Embodiment
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
With reference to Fig. 1, the IF steel tundish of the present embodiment, including tundish body 1 and suppression whirlpool device 1, the tundish Middle water containing opening 104 and dam 101 are provided with body 1, middle water containing opening 104 is located at tundish body bottom portion 103, dam 101 surround the region separated with middle water containing opening 104 in tundish body 1, and dam 101 surrounds the bottom in region It is connected with middle water containing opening 104 (i.e. relatively independent by installing the formation one in tundish body 1 of dam 101 first Space, then the bottom of the separate space is connected with middle water containing opening 104).Specifically, dam 101 surrounds region Bottom be provided with pad level 102, is provided with pod apertures 105 in the pad level 102, dam 101 is surrounded region by pod apertures 105 Bottom is connected with middle water containing opening 104.In the present embodiment, pod apertures 105 are to include vertical section and " L " shape of horizontal segment is led to Hole, the bottom that the vertical section of pod apertures 105 surrounds region with dam 101 connect, and the horizontal segment of pod apertures 105 is close to tundish sheet Body bottom 103 is set, and the horizontal segment of pod apertures 105 connects with middle water containing opening 104;The vertical section of pod apertures 105 and horizontal segment Junction is circular sliding slopes.The interface both sides for the bottom that the vertical section of pod apertures 105 surrounds region with dam 101 are respectively equipped with One suppression whirlpool device 1, suppression whirlpool device 1 is to include vertical section and " umbrella " the shape structure in vertical section top umbrella cover portion, and Straight line where above-mentioned vertical section and the angle in umbrella cover portion are 120 °~180 ° (120 ° are taken in specific the present embodiment).
In continuous casting latter stage, the liquid level of molten steel is less than the height of dam, and a large amount of molten steel can be caused to remain in dam It in the region surrounded, can not be used effectively, cause that molten steel recovery rate is low, and economic benefit is bad.In view of the above-mentioned problems, existing skill It is proposed opens up the scheme of through hole in dam side fixed position in art, although the program reduces centre to a certain extent Baogang's water note surplus, but there is problems:(1) dam of the prior art is mainly using fire resistings such as magnesia or magnalium matter Material is made, and dam is vertically arranged, and that bears molten steel for a long time washes away erosion and static pressure, in actual applications dam meeting Damage, the damage that dam is found by studying are typically in its side through hole, under the physics of molten steel and chemical action, are led to Hole borehole enlargement, and be uneven expansion, thus change originally by hydraulic analogy and the aperture and flow field that calculate, The effect designed originally can not be played;After through hole constantly expands, the bulk strength of dam is reduced, finally makes dam Fracture and destroyed by rush of water, substantially reduce the service life of dam;(2) molten steel is direct from top to bottom by the through hole of dam side The liquid steel level in the region of middle water containing opening 104 is flowed to, direct impact can be formed to the liquid steel level in the region of middle water containing opening 104, Slag is formed, causes the liquid level slag blanket in the region of middle water containing opening 104 to be rolled into molten steel, is finally formed in strand a large amount of big Type field trash;On the other hand, molten steel directly flows out from dam side through hole, can be formed in dam side through hole more bright Aobvious turbulent flow and vortex, first, when molten steel flows into middle water containing opening 104, the molten steel in the region of middle water containing opening 104 is easily disturbed, is increased The liquid level slag blanket in the region of middle water containing opening 104 is added to be rolled into degree inside molten steel, second, can be surrounded to remaining in dam Molten steel in region forms disturbance so that dam surrounds liquid steel level slag blanket in region and is rolled into inside molten steel, same big The big content for adding strand Large Inclusions;(3) through hole is located at the fixed position of dam side, as molten steel notes surplus Reduction, dam surrounds the through hole that liquid steel level in region becomes closer to dam side, due to can not intuitively observe To the real-time relative position of liquid steel level and dam side through hole, easily cause the slag blanket near liquid steel level and pass through dam The phenomenon that side through hole is flowed directly into middle water containing opening 104, and with the decline of liquid steel level, the impurity near liquid steel level Increasingly flowed out easily by dam side through hole, the final content for increasing field trash in strand.
General steel grade is not strict with to field trash size and number, but for producing IF steel, then has strict requirements, IF steel requires higher to field trash in strand, and field trash equivalent diameter typically requires to be necessarily less than 100 μm, and inventor is by a large amount of Field experiment finds that fixed position opens up the unsuitable production IF steel of through hole in dam side in the prior art, by keeping off Slag dam side fixed position opens up through hole to produce IF steel, can greatly increase the content of strand Large Inclusions, influences most The IF steel qualities that are obtained eventually, automobile factory is gently then caused to occur tiny defect in punching press Automobile Plate, it is heavy then cause Automobile Plate direct Cracking forms waste product, has a strong impact on economic benefit, is much difficult to the requirement for meeting IF steel actual productions.Therefore, how can control On the basis of molten steel note surplus processed, the content of steel Large Inclusions is significantly reduced, meets the requirement of IF steel actual productions, be existing There is the technical barrier of a urgent need to resolve in technology.
In the present embodiment, the bottom that dam 101 surrounds region is connected with middle water containing opening 104, specifically, dam 101 bottoms for surrounding region are provided with pad level 102, are provided with pod apertures 105 in the pad level 102, pod apertures 105 be include it is vertical " L " shape through hole of section and horizontal segment, the bottom that the vertical section of pod apertures 105 surrounds region with dam 101 connect, pod apertures 105 horizontal segments are set close to tundish body bottom portion 103, and the horizontal segment of pod apertures 105 connects with middle water containing opening 104, water conservancy diversion The junction of the vertical section of hole 105 and horizontal segment is circular sliding slopes;Wherein, the bottom setting that region is surrounded in dam 101 is padded Layer 102, the space of the installation of pod apertures 105 is on the one hand provided, region is surrounded from dam 101 by pod apertures 105 for molten steel Bottom outflow provide condition;On the other hand, pad level 102 can effectively resist the top-down erosion of molten steel, in raising Between bag body 1 service life.Wherein, it is to include " L " shape through hole of vertical section and horizontal segment to set pod apertures 105 so that steel When water flows in pod apertures 105,90 ° of deflecting occurs, slow down the speed of molten steel flowing in pod apertures 105, be advantageous to Impact of the molten steel from after the outflow of pod apertures 105 to the region molten steel of middle water containing opening 104 is reduced, avoids the region of middle water containing opening 104 Liquid level slag blanket be rolled into molten steel;Simultaneously as the horizontal segment of pod apertures 105 is set close to tundish body bottom portion 103, steel Water along the horizontal segment of pod apertures 105 flow to 104 region of middle water containing opening when, can directly reach the steel in middle water containing opening 104 region Water level will not be formed direct impact to the liquid steel level in the region of middle water containing opening 104, be avoided middle water containing opening with lower part The liquid level slag blanket in 104 regions is rolled into molten steel, reduces the formation of strand steel Large Inclusions.Wherein, in pad level 102 Provided with pod apertures 105, because pad level 102 has a certain thickness, and pad level 102 not by pod apertures 105 along whole horizontal stroke To through, its intensity is higher, is not susceptible to damage, meanwhile, the side of dam 101 is not provided with through hole, greatly reduces dam 101 probabilities to be destroyed by rush of water, hence it is evident that improve the service life of dam 101.Wherein, the vertical section of pod apertures 105 and dam 101 The bottom connection in region is surrounded, ensure that cast latter stage remains in the molten steel that dam is surrounded in region and surrounds area along dam The bottom outflow in domain, therefore, the slag blanket of liquid steel level is always positioned at the superiors during molten steel outflow, is easy to the height according to slag blanket Degree controls molten steel note surplus at any time, and ensures the slag blanket of liquid steel level not as molten steel flows out to middle water containing opening 104.
It should be noted that molten steel surrounds the bottom outflow in region from dam, can be in the vertical section of pod apertures 105 and pushing off the slag The interface that dam 101 surrounds the bottom in region forms certain turbulent flow and vortex, in order to avoid above-mentioned turbulent flow and vortex cause to cast The increased phenomenon of base Large Inclusions content, a suppression whirlpool device 1, the suppression whirlpool are respectively equipped with above-mentioned interface both sides Device 1 is to include vertical section and " umbrella " the shape structure in vertical section top umbrella cover portion, and straight line and umbrella where above-mentioned vertical section The angle of face is 120 °, it is emphasized that, inventor has found by simulated experiment, and the setting of suppression whirlpool device 1 can Effective local buffer area is formed in above-mentioned interface both sides, weakens turbulent flow and whirlpool that molten steel is formed in above-mentioned interface significantly Stream, substantially reduce the content of steel Large Inclusions;In addition, the setting of the vertical section of suppression whirlpool device 1, reduces above-mentioned interface The linear velocity of place top molten steel in the horizontal direction, the setting in the umbrella cover portion of suppression whirlpool device 1, effectively slow down square steel on interface The speed that water flows from top to bottom, avoid liquid level slag blanket and be involved in pod apertures under the drive of quick flowing molten steel from top to bottom Phenomenon in 105.Inventor is had found by multiple comparison test, and straight line where above-mentioned vertical section and the angle in umbrella cover portion are set For 120 °~180 °, suppression whirlpool device 1 weakens the best results of turbulent flow and vortex.
In the present embodiment, " L " shape pod apertures 105 can not directly impact the region liquid steel level of middle water containing opening 104 Under the conditions of, molten steel is emptied to greatest extent, and " umbrella " shape suppression whirlpool device 1 can prevent field trash from entering molten steel inside ensuring steel Water degree of purity, the two synergy, the purpose that molten steel note surplus is reduced under conditions of Molten Steel Cleanliness is ensured is can be only achieved, it is full The quality requirement of sufficient IF steel, realize the target of increase Business Economic Benefit;Specifically, " L " shape pod apertures 105 and " umbrella " shape suppression whirlpool Device 1 ensures that slag blanket is not rolled into inside molten steel jointly, strand Large Inclusions content is substantially reduced, using this reality The IF steel tundish of example is applied, requirement of the IF steel to field trash in strand is disclosure satisfy that, is verified through many experiments, using the present embodiment The strand produced of IF steel tundish, its field trash equivalent diameter is respectively less than 100 μm.
In the prior art, to ensure slab quality, prevent from pouring into a mould latter stage Tundish Slag caused by the generation of vortex Be involved in, it is however generally that tundish need to leave the molten steel of certain altitude, especially require Control and Inclusion Removal higher steel grade, middle Bag note reinforcement degree must be controlled in certain limit, and therefore, molten steel recovery rate is relatively low.Using the IF steel tundish of the present embodiment, energy Enough on the premise of the production of IF steel is met, hence it is evident that reduce the molten steel note surplus of tundish, certain steel mill, use the IF steel of the present embodiment Before tundish, cast latter stage when the liquid steel level between two dams 101 is less than 101 height of dam, that is, stops cast, this When two dams 101 between liquid steel level be highly 250mm, after the IF steel tundish of the present embodiment, cast latter stage is when two When liquid steel level between dam 101 is less than 101 height of dam, molten steel is continued to flow out by pod apertures 105, when molten steel liquid When face is down to apart from 102 upper surface 65mm of pad level, i.e., instrument shows remaining 2.5 ton hours of molten steel in tundish, now stops immediately Only cast (because now liquid steel level whirlpool is fairly obvious in tundish, should not be further continued for reducing liquid steel level), then passes through The field trash in strand obtained by scanning electron microscopic observation, more than 100 μm of field trash is not found.Pass through comparative experimental research table It is bright, equally by the prior art in tundish of the dam side with through hole liquid steel level be down to 65mm it is high when stop pour into a mould, lead to The field trash in strand obtained by overscanning electron microscopic observation, discovery are clearly present being mingled with for a fairly large number of 100~300um Thing, field trash source are mainly Tundish Slag.By above-mentioned description of test, using the IF steel tundish of the present embodiment, can control System, which is not contained on the premise of equivalent diameter is more than 100 μm of field trashes, (meets the production requirement of IF steel), in reducing to greatest extent Between wrap in remaining IF steel molten steel amount, so as to improve molten steel recovery rate, increase Business Economic Benefit.Specifically used the present embodiment After IF steel tundish, pour into a mould the dam 101 of latter stage two between liquid steel level reduce 175mm, reduction remaining molten steel amount It can be calculated, be a prismatoid (i.e. truncated rectangular pyramids) according to region between the dam 101 of tundish bottom two, long 5060mm, on Bottom width 1280mm, lower bottom width 1040mm, therefore, saving molten steel amount is:5.060×[0.5×(1.280+1.040)×0.175] × 7.3=7.498t, wherein, the density of molten steel takes 7.3t/m3;With 2150 yuan/ton of pour steel average price, heavy-duty waste steel is put down Equal 1310 yuan/ton of price, monthly average are calculated using 142 tundish, then year benefit is:12×142×7.498×(2150- 1310) economic benefit of enterprise can=1073.23 ten thousand yuan, therefore using the IF steel tundish of the present embodiment, be significantly increased.
Embodiment 2
With reference to Fig. 2, the IF steel tundish of the present embodiment, its structure is substantially the same manner as Example 1, and its difference is: Pod apertures 105 have two groups, and two groups of pod apertures 105 before and after same middle water containing opening 104 on being symmetrical arranged, and every group of pod apertures 105 comprise at least a pod apertures 105.In specific the present embodiment, pod apertures 105 share two, and two pod apertures 105 are on same It is symmetrical arranged before and after one middle water containing opening 104.The IF steel tundish of the present embodiment, its main cross section structure diagram is identical with Fig. 1, Reference picture 2 understands that two pod apertures 105 are symmetrically disposed in the both sides of same middle water containing opening 104, so that molten steel energy Enough symmetrically to flow into same middle water containing opening 104 by two pod apertures 105 respectively, symmetrically arranged pod apertures 105 can eliminate Set single pod apertures 105 to be easily formed about the deficiency of bottom vortex in middle water containing opening 104, can effectively avoid slag.
Embodiment 3
With reference to Fig. 3, the IF steel tundish of the present embodiment, its structure is substantially the same manner as Example 1, and its difference is: In the present embodiment, middle water containing opening 104 has two, and two middle water containing openings 104 surround region positioned at dam 101 respectively Both sides;Pod apertures 105 have two, and two pod apertures 105 dam 101 is surrounded respectively region bottom and two tundish The mouth of a river 104 is corresponding to be connected.Wherein, two pod apertures 105 are symmetrically disposed in pad level 102, and molten steel is along two water conservancy diversion Hole 105 symmetrically surrounds the bottom outflow in region from dam 101, can effectively reduce molten steel and surround region from dam 101 When bottom is flowed out, in the vortex that above-mentioned interface is formed, the final content for effectively reducing strand Large Inclusions.Meanwhile if Two middle water containing openings 104 are put, the operating efficiency for the IF steel tundish that has been multiplied.
Embodiment 4
With reference to Fig. 4, the IF steel tundish of the present embodiment, its structure is substantially the same manner as Example 3, and its difference is: It is 180 ° to press down straight line where vertical section and the angle in umbrella cover portion in whirlpool device 1.
Embodiment 5
With reference to Fig. 5, the IF steel tundish of the present embodiment, its structure is substantially the same manner as Example 3, and its difference is: Suppression whirlpool device 1 in the present embodiment is replaced by suppression whirlpool device 2 107, and suppression whirlpool device 2 107 is rectangular block, suppression whirlpool device two 107 surround the interface side of the bottom in region positioned at the vertical section of pod apertures 105 with dam 101, and press down whirlpool device 2 107 One end contacts with the medial surface of dam 101, and the other end of suppression whirlpool device 2 107 does not cover above-mentioned interface, suppression whirlpool device 2 107 Setting reduce the linear velocity of molten steel in the horizontal direction above above-mentioned interface, effectively inhibit the shape of whirlpool above interface Into.Suppression whirlpool device 2 107 is made up of the refractory material of following mass percent:1.2%SiC, 2.2%BN, 85.4%CaO, 5.9%MnO, 1.3%Al2O3, 1.9%SiO2, 2.1%ZrO2(the suppression whirlpool device 2 107 of this composition is not easy to be invaded in molten steel Erosion);Wherein, the manufacture method for pressing down whirlpool device 2 107 is as follows:
(1) it after above-mentioned refractory material dispensing, will add in batch mixer dry-mixed 10 minutes, then add and account for refractory material gross weight The water of amount 7.5%, wet mixing 15 minutes;
(2) the good material of wet mixing is put into loose tool, in charging with vibrating head vibration moulding, presses down whirlpool device 2 107 Green compact manufacture is completed, and green compact are conserved into 24h at a temperature of 30 DEG C;
(3) toast and cool down, be divided into the next stage:It is incubated after being warming up to 180 DEG C from 30 DEG C of programming rates with 25 DEG C/h 8h;10h is incubated after being warming up to 320 DEG C again with 25 DEG C/h programming rate;After being warming up to 575 DEG C again with 25 DEG C/h programming rate It is incubated 12h;Last natural cooling 30h, suppression whirlpool device 2 107, which manufactures, to be completed.The suppression whirlpool prepared using above-mentioned raw materials and method is filled 2 107 are put, its heat resistance and intensity can adapt to the working environment in IF steel tundish.
Embodiment 6
With reference to Fig. 6, the IF steel tundish of the present embodiment, tundish body 1 is interior to be provided with two pairs of dams 101, every a pair of gears Slag dam 101 is symmetrical arranged on the symmetrical line of tundish body 1;Middle water containing opening 104 is located at tundish body bottom portion 103, adjacent dam 101 surrounds the region separated with middle water containing opening 104, and adjacent pushing off the slag in tundish body 1 The bottom that dam 101 surrounds region is connected with middle water containing opening 104.Specifically, all adjacent dams 101 surround region Bottom is equipped with pad level 102, is provided with pod apertures 105 in the pad level 102, adjacent dam 101 is surrounded area by pod apertures 105 The bottom in domain is connected with middle water containing opening 104.Pod apertures 105 are to include " L " shape through hole of vertical section and horizontal segment, and this is led The bottom that the vertical section of discharge orifice 105 surrounds region with adjacent dam 101 connects, and the horizontal segment of pod apertures 105 is close to tundish body Bottom 103 is set, and the horizontal segment of pod apertures 105 connects with middle water containing opening 104;The company of the vertical section of pod apertures 105 and horizontal segment It is circular sliding slopes to meet place.Specifically, middle water containing opening 104 has two, and two middle water containing openings 104 are located at two pairs of pushing off the slag respectively The both sides on dam 101.It is highly smaller with nearer a pair of the dams 101 of 1 symmetrical linear distance of tundish body.In Between 1 symmetrical line of bag body a pair of dams 101, its surround the bottom in region pass through it is symmetrical along tundish body 1 The symmetrical two groups of pod apertures 105 of line are corresponding with the middle water containing opening 104 of both sides respectively to be connected, and other adjacent dams 101 enclose It is connected respectively by one group of pod apertures 105 with the middle water containing opening 104 of respective side into the bottom in region, wherein, every group of water conservancy diversion Hole 105 is on corresponding 104 symmetrically arranged two pod apertures 105 of middle water containing opening.Also include suppression whirlpool device 1, water conservancy diversion The interface both sides for the bottom that the vertical section of hole 105 surrounds region with adjacent dam 101 are respectively equipped with a suppression whirlpool device one 106, suppression whirlpool device 1 is to include vertical section and " umbrella " the shape structure in vertical section top umbrella cover portion, and where above-mentioned vertical section Straight line and the angle in umbrella cover portion are 120 °.
In the present embodiment, two pairs of dams 101 are provided with tundish body 1, every a pair of dams 101 are on tundish The symmetrical line of body 1 is symmetrical arranged, and two pairs of dams 101 surround three and middle water containing opening 104 in tundish body 1 The region separated, wherein, near a pair of dams 101 of 1 symmetrical line of tundish body, its height is less than another To dam 101 (the height setting of each pair dam 101 is inconsistent, is advantageous to carry out layered buffer to molten steel);Height is smaller A pair of dams 101 its surround the bottom in region, pass through symmetrical two groups of pod apertures 105 tundish with both sides respectively The mouth of a river 104 is corresponding to be connected, other adjacent dams 101 surround the bottom in region respectively by one group of pod apertures 105 with it is corresponding The middle water containing opening 104 of side is connected.The setting of above-mentioned two pairs of dams 101, the molten steel for entering tundish can be carried out Layered buffer, resistance to erosion, erosion-resisting characteristics of the dam 101 to high-temperature molten steel are improved, molten steel initially enters highly less It is upward by tundish bottom by the effect to dam 101, molten steel wherein in the region that a pair of dams 101 surround Portion moves, and the field trash in molten steel can move floating upward quickly upwards, make molten steel pure;Then molten steel symmetrically enters other In the region that two adjacent dams 101 surround, the effect of dam 101 is again passed by, molten steel moves drive field trash upwards Float, improve the nowed forming of molten steel in tundish, extend the time that molten steel reaches middle water containing opening 104, promote folder Debris floats separation, uniform molten steel composition and temperature.It is emphasized that the pushing off the slag in the present embodiment in tundish body 1 Dam 101 is not limited to two pairs, and multipair dam 101 can be set gradually according to Fig. 6 form, promotes inclusion content in melting steel to float and divides From the content of field trash in reduction strand.Wherein, every group of pod apertures 105 are symmetrically arranged on corresponding middle water containing opening 104 Two pod apertures 105, two pod apertures 105 are symmetrically disposed in the both sides of same middle water containing opening 104, so that steel Water can symmetrically flow into same middle water containing opening 104, symmetrically arranged pod apertures 105 by two pod apertures 105 respectively The deficiency for setting single pod apertures 105 to be easily formed about bottom vortex in middle water containing opening 104 can be eliminated, can effectively be avoided Slag.
Embodiment 7
With reference to Fig. 7, the IF steel tundish of the present embodiment, its structure is substantially the same manner as Example 3, and its difference is: Pod apertures 105 are not " L " shape through hole, but stepped throughhole, the stepped throughhole surround dam 101 bottom in region It is connected with middle water containing opening 104, because pod apertures 105 are stepped throughhole, the resistance of molten steel flowing in pod apertures 105 increases The speed that add, flows reduces, on the one hand advantageously reduce to molten steel from after the outflow of pod apertures 105 to the region of middle water containing opening 104 The impact of molten steel, the liquid level slag blanket in the region of middle water containing opening 104 is avoided to be rolled into inside molten steel;On the other hand water conservancy diversion is reduced Hole 105 and dam 101 surround the pressure differential between region, reduce the violent journey that turbulent flow and vortex are formed in above-mentioned interface Degree.
Embodiment 8
With reference to Fig. 8, according to the manufacture method of the IF steel tundish of embodiment 2, comprise the following steps:
(1) three-dimensional modeling:The 3-D geometric model of pod apertures 105 is drawn using 3 d modeling software;
(2) 3D printing:The 3-D geometric model of pod apertures 105 is inputted to 3D printer, 3D printing goes out the curved of ABS materials Pipe, the bend pipe and the physical dimension of pod apertures 105 match;
(3) bend pipe is installed:During IF steel tundish is built by laying, above-mentioned bend pipe is embedded in pad level 102;
(4) dam is installed:Dam 101 is attached in tundish body 1;
(5) water conservancy diversion hole forming:IF steel tundish is toasted, the bend pipe heated combustion of ABS materials disappears in baking process Lose, it is pollution-free to molten steel, the satisfactory pod apertures 105 of physical dimension are only formed in pad level 102.
Because the structure of pod apertures 105 is special, using traditional handicraft it is difficult to ensure that the dimensional accuracy of pod apertures 105, and then The using effect of IF steel tundish is influenceed, and by above-mentioned manufacture method, the size that can accurately control pod apertures 105 is smart Degree, so that it is guaranteed that the IF steel tundish of the present embodiment manufacture effectively uses.
Embodiment 9
With reference to Fig. 9, according to the application method of the IF steel tundish of embodiment 2, comprise the following steps:
(1) molten steel injects:When continuous casting normally produces, IF steel molten steel is injected into dam 101 in tundish body 1 and surrounded Region, IF steel molten steel is collected in the region that dam 101 surrounds;Wherein, in the present embodiment, IF steel molten steel includes following The element of mass percent:0.002%C, 0.025%Si, 0.18%Mn, 0.003%P, 0.003%S, 0.0017%N;
(2) lasting cast:With the lasting injection of IF steel molten steel, the liquid level of IF steel molten steel is more than gear in tundish body 1 The height of slag dam 101, IF steel molten steel flow out from middle water containing opening 104;
(3) latter stage is poured into a mould:Stopping the injection of IF steel molten steel, the liquid level of IF steel molten steel gradually reduces in tundish body 1, when When the liquid level of IF steel molten steel is less than the height of dam 101 in tundish body 1, remained in the region that dam 101 surrounds IF steel molten steel is flowed out by pod apertures 105;
(4) casting complete:When the IF steel molten steel liquid levels remained in the region that dam 101 surrounds drop to certain altitude When, middle water containing opening 104 is blocked, casting complete;Wherein, field trash equivalent diameter is less than 100 μm in strand after continuous casting.
Embodiment 10
The IF steel tundish of the present embodiment, its structure is substantially the same manner as Example 3, and its difference is:
It is emphasized that in the IF steel tundish of the present embodiment, pod apertures 105 are not the situations for two, specifically originally In embodiment, pod apertures 105 are two groups, and two groups of pod apertures 105 respectively surround dam 101 in the bottom and two in region Between water-coating port 104 is corresponding is connected.Wherein, every group of pod apertures 105 are on corresponding 104 symmetrically arranged even number of middle water containing opening Individual pod apertures 105, with embodiment 2 similarly, every group of pod apertures 105 are symmetrical arranged, and enable to molten steel symmetrically to flow into correspondingly Same middle water containing opening 104, can eliminate and set single pod apertures 105 to be easily formed about bottom whirlpool in middle water containing opening 104 The deficiency of stream, it can effectively avoid slag.
Embodiment 11
The IF steel tundish of the present embodiment, its structure is substantially the same manner as Example 5, and its difference is:
Suppression whirlpool device 2 107 is made up of the refractory material of following mass percent:0.5%SiC, 0.7%BN, 91.3% CaO, 4.0%MnO, 0.9%Al2O3, 1.1%SiO2, 1.5%ZrO2;Wherein, the manufacture method for pressing down whirlpool device 2 107 is as follows:
(1) it after above-mentioned refractory material dispensing, will add in batch mixer dry-mixed 5 minutes, then add and account for refractory material gross weight The water of amount 6.9%, wet mixing 10 minutes;
(2) the good material of wet mixing is put into loose tool, in charging with vibrating head vibration moulding, presses down whirlpool device 2 107 Green compact manufacture is completed, and green compact are conserved into 30h at a temperature of 5 DEG C;
(3) toast and cool down, be divided into the next stage:It is incubated after being warming up to 150 DEG C from 5 DEG C of programming rates with 30 DEG C/h 9h;12h is incubated after being warming up to 300 DEG C again with 30 DEG C/h programming rate;After being warming up to 550 DEG C again with 30 DEG C/h programming rate It is incubated 15h;Last natural cooling 35h, suppression whirlpool device 2 107, which manufactures, to be completed.
Embodiment 12
The application method of the IF steel tundish of the present embodiment, its basic step is same as Example 9, and its difference exists In:In the present embodiment, IF steel molten steel includes the element of following mass percent:0.001%C, 0.013%Si, 0.15%Mn, 0.005%P, 0.005%S, 0.0035%N.
Schematically the present invention and embodiments thereof are described above, this describes no restricted, institute in accompanying drawing What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So if common skill of this area Art personnel are enlightened by it, without departing from the spirit of the invention, without designing and the technical scheme for creativeness Similar frame mode and embodiment, protection scope of the present invention all should be belonged to.

Claims (5)

1. a kind of application method of IF steel tundish, comprises the following steps:
(1) molten steel injects:When continuous casting normally produces, IF steel molten steel is injected into tundish body (1) interior dam (101) and surrounded Region, IF steel molten steel is collected in the region that dam (101) surrounds;Wherein, the IF steel molten steel includes following quality The element of percentage:0.001~0.003%C, 0.011~0.025%Si, 0.11~0.19%Mn, 0.003~0.006%P, 0.003~0.007%S, 0.0015~0.0040%N;
(2) lasting cast:With the lasting injection of IF steel molten steel, the liquid level of the interior IF steel molten steel of tundish body (1) is more than pushing off the slag The height on dam (101), IF steel molten steel flow out from middle water containing opening (104);
(3) latter stage is poured into a mould:Stop the injection of IF steel molten steel, the liquid level of the interior IF steel molten steel of tundish body (1) gradually reduces, central Between the liquid level of the interior IF steel molten steel of bag body (1) when being less than the height of dam (101), it is residual in the region that dam (101) surrounds The IF steel molten steel stayed is flowed out by pod apertures (105);
(4) casting complete:When the IF steel molten steel liquid levels remained in the region that dam (101) surrounds drop to certain altitude, Middle water containing opening (104) is blocked, casting complete;Wherein, field trash equivalent diameter is less than 100 μm in strand after continuous casting;
The IF steel tundish includes tundish body (1), and middle water containing opening (104) and gear are provided with the tundish body (1) Slag dam (101), the middle water containing opening (104) are located at tundish body bottom portion (103), and the dam (101) is in tundish The region separated with middle water containing opening (104) is surrounded in body (1), and dam (101) surrounds the bottom in region with Between water-coating port (104) be connected;
The bottom that dam (101) surrounds region is provided with pad level (102), and pod apertures (105) are provided with the pad level (102), The bottom that the pod apertures (105) surround dam (101) in region is connected with middle water containing opening (104);
The pod apertures (105) are " L " the shape through hole for including vertical section and horizontal segment, pod apertures (105) vertical section and pushing off the slag Dam (101) surrounds the bottom connection in region, and pod apertures (105) horizontal segment is set close to tundish body bottom portion (103), and water conservancy diversion Hole (105) horizontal segment connects with middle water containing opening (104);The junction of pod apertures (105) vertical section and horizontal segment connects for circular arc Connect;It is characterized in that:
Also include suppression whirlpool device one (106), pod apertures (105) vertical section surrounds the interface of the bottom in region with dam (101) Place both sides are respectively equipped with a suppression whirlpool device one (106), and the suppression whirlpool device one (106) is to include vertical section and vertical section top " umbrella " the shape structure in umbrella cover portion, and straight line where the vertical section and the angle in umbrella cover portion are 120 °~180 °.
2. the application method of IF steel tundish according to claim 1, it is characterised in that:The pod apertures (105) have two Group, two groups of pod apertures (105) are symmetrical arranged on same middle water containing opening (104), and every group of pod apertures (105) comprises at least one Individual pod apertures (105).
3. the application method of IF steel tundish according to claim 1, it is characterised in that:The middle water containing opening (104) There are two, and two middle water containing openings (104) surround the both sides in region positioned at dam (101) respectively;The pod apertures (105) Have two groups, and two groups of pod apertures (105) dam (101) is surrounded respectively region bottom and two middle water containing openings (104) Corresponding to be connected, every group of pod apertures (105) comprises at least a pod apertures (105).
4. the application method of IF steel tundish according to claim 1, it is characterised in that:Also include suppression whirlpool device two (107), the suppression whirlpool device two (107) is rectangular block, and suppression whirlpool device two (107) is located at pod apertures (105) vertical section and pushing off the slag Dam (101) surrounds the interface side of the bottom in region, and presses down one end and dam (101) medial surface of whirlpool device two (107) Contact, the other end of suppression whirlpool device two (107) do not cover the interface;
Suppression whirlpool device two (107) is made up of the refractory material of following mass percent:0.1~6.6%SiC, 0.1~4.5%BN, 85~92%CaO, 3.5~7.3%MnO, 0.1~1.9%Al2O3, 0.1~5.3%SiO2, 1.4~5.6%ZrO2;Wherein, The manufacture method for pressing down whirlpool device two (107) is as follows:
(1) it after above-mentioned refractory material dispensing, will add in batch mixer dry-mixed 5~10 minutes, then add and account for refractory material gross weight The water of amount 6.9~7.5%, wet mixing 10~15 minutes;
(2) the good material of wet mixing is put into loose tool, in charging with vibrating head vibration moulding, the life of suppression whirlpool device two (107) Base manufacture is completed, and green compact are conserved into 24~30h at a temperature of 5~30 DEG C;
(3) toast and cool down, be divided into the next stage:150~180 are warming up to from 5~30 DEG C of programming rates with 25~30 DEG C/h 8~9h is incubated after DEG C;10~12h is incubated after being warming up to 300~320 DEG C again with 25~30 DEG C/h programming rate;Again with 25~ 30 DEG C/h programming rate is incubated 12~15h after being warming up to 550~575 DEG C;30~35h of last natural cooling, suppression whirlpool device two (107) manufacture is completed.
5. the application method of the IF steel tundish according to claim 1-4 any one, it is characterised in that:Dam (101) at least three regions separated with middle water containing opening (104), and each pushing off the slag are surrounded in tundish body (1) The bottom in the region that dam (101) surrounds is connected by pod apertures (105) with middle water containing opening (104).
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