CN105750519A - Method and device for improving surface quality of cast blank of continuous casting machine by adding covering slag - Google Patents

Method and device for improving surface quality of cast blank of continuous casting machine by adding covering slag Download PDF

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Publication number
CN105750519A
CN105750519A CN201410817669.XA CN201410817669A CN105750519A CN 105750519 A CN105750519 A CN 105750519A CN 201410817669 A CN201410817669 A CN 201410817669A CN 105750519 A CN105750519 A CN 105750519A
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China
Prior art keywords
covering slag
crystallizer
liquid
liquid covering
crucible
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CN201410817669.XA
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Chinese (zh)
Inventor
张立
刘军占
石洪志
李成斌
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宝山钢铁股份有限公司
宝钢特钢有限公司
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Priority to CN201410817669.XA priority Critical patent/CN105750519A/en
Publication of CN105750519A publication Critical patent/CN105750519A/en

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Abstract

The invention relates to a method and a device for improving the surface quality of a cast blank of a continuous casting machine by adding covering slag. The device comprises a crystallizer, wherein a crystallizer liquid covering slag adding system is connected to a crystallizer opening in the upper part of the crystallizer; by means of the system, solid covering slag is molten by using a medium frequency induction heating technology and is then heated to a certain temperature, the outflow volume of liquid covering slag is controlled by adopting a stopper bar, and the liquid covering slag is added into the crystallizer after passing through a liquid covering slag distributor and a guide pipe, so as to form a full-liquid covering slag layer at the upper part of molten steel in the crystallizer. Meanwhile, a crystallizer heat-insulation cover is additionally arranged at the upper part of the crystallizer to reduce radiant heat loss at the upper part of the crystallizer. According to the method and the device disclosed by the invention, the liquid covering slag is added to the continuous casting machine, and the addition amount of the liquid covering slag is controlled according to the thickness of the liquid covering slag layer, such that the surface quality of a continuously cast blank is improved; in addition, The method disclosed by the invention is a substitute method of a conventional solid covering slag adding method for a continuous casting machine, has universality and can be applied to various continuous casting machines for, such as, square billets, round billets and plate billets.

Description

Method and the device of casting blank of continuous casting machine surface quality is improved by adding covering slag

Technical field

The present invention relates to and improve metallurgical technology field, particularly relate to a kind of employing being applied to casting blank of continuous casting machine and add the method for the covering slag technique to improve its cc billet surface quality.

Background technology

At present, each iron and steel metallurgy enterprise is equipped with continuous casting line, and continuous casting of iron and steel production is the necessary link in modern steel metallurgical technology, and continuous casting ratio represents the advanced level of Ferrous Metallurgy technology.Conticaster is in order to blanks such as the round base of production and supply milling train, square billet, slabs, and covering slag is the indispenseble expendables that conticaster produces.Covering slag adds via conticaster crystallizer top, plays heat-insulation and heat-preservation, anti-oxidation, lubrication, absorption non-metallic inclusion, promotes the effects such as green shell homoepitaxial (slag film).

The lubrication of covering slag is most important to the surface quality of continuous casting billet, causes bleed-out accident time serious.Improve the surface quality of continuous casting billet, it is possible to reduce the reconditioning quality of later process, it is possible to increase the quality of stocking, relevant technology belongs to energy-saving and cost-reducing, environmental protection new technique.

And the conventional continuous casting manufacturing technique under prior art; solid-state covering slag is added on crystallizer top; covering slag forms the three-decker of solid slag blanket, sinter layer and liquid protection slag blanket on crystallizer molten steel top, and solid-state covering slag is only possible to after being only melted has lubrication and slag membrane interaction.Solid-state covering slag fusion process absorbs a large amount of heat energy from high-temperature molten steel; require that molten steel overheat must reach certain value on the one hand; cause on the other hand being difficult to the steel grade that casting molten steel overheat is low; or when molten steel overheat is gradually lowered; cc billet surface quality constantly worsens; bleed-out accident even occurs, and according to statistics, the dependency of casting blank of continuous casting machine (continuous casting billet) surface quality defect and covering slag reaches more than 70%.

In sum, first in the urgent need to a kind of novel covering slag Adding Way, can effectively improve cc billet surface quality, and the requirement to molten steel overheat can be reduced.

Summary of the invention

In order to solve a large amount of heat energy of absorption added existing for solid-state covering slag under prior art on crystallizer top, require that molten steel overheat must reach certain value and the problem being difficult to the low steel grade of casting molten steel overheat, and the cc billet surface quality caused constantly worsens, even there is the phenomenon of bleed-out accident, the invention provides the method and the device that improve casting blank of continuous casting machine surface quality by adding covering slag, the method is that conticaster adds liquid covering slag, the thickness of slag blanket is protected according to liquid, control the addition of liquid covering slag, be conducive to improving the surface quality of continuous casting billet.The method and the device that improve casting blank of continuous casting machine surface quality by adding covering slag of the present invention, its concrete scheme is as described below:

Improve method and the device of casting blank of continuous casting machine surface quality by adding covering slag, including crystallizer, its overall flow is as follows:

1) before conticaster casting starts; being added by solid-state covering slag in the crucible that crystallizer liquid covering slag adds system, after starting induction heater, crucible and solid-state covering slag are successively heated; after crucible is heated to uniform temperature, regulates heating power and ensure that the temperature of crucible can not be too high.Solid-state covering slag fusing after, continue to be heated to 1345 DEG C~1355 DEG C, make liquid covering slag temperature relatively small change time viscosity B coefficent little as far as possible;

2) step 1) in order to reduce liquid covering slag thermal loss in course of conveying; liquid covering slag is before flowing out crucible; the induction heater that liquid covering slag allotter and mozzle are arranged is opened, liquid covering slag allotter and mozzle are carried out preheating heating and insulation;

3) after conticaster casting starts; lifting stopper bar, liquid covering slag is flowed in liquid covering slag allotter, then arrives the crystallizer opening part on crystallizer top then through mozzle; last liquid covering slag flows into the top of the molten steel in crystallizer, forms the covering slag Rotating fields of full liquid;

4), in step 3, in order to reduce the radiation heat loss of the upper surface liquid covering slag in crystallizer, the crystallizer insulation cover arranged on the top of crystallizer can be closed.

The described crystallizer crystallizer opening part on top is connected with a crystallizer liquid covering slag and adds system;

The liquid covering slag that described crystallizer liquid covering slag addition system is heated injects the top of the molten steel being positioned at crystallizer by this crystallizer opening part, forms the covering slag Rotating fields of full liquid.

Purpose of design is in that herein, crystallizer liquid covering slag adds system by the fusing of solid-state covering slag is controlled, flow-control to liquid covering slag, the conveying temperature drop of liquid covering slag is controlled, crystallizer liquid is protected radiation heat loss's control etc. of slag blanket, substitute solid-state covering slag and add system, enable liquid covering slag covering slag controlled, can be continuous, the molten steel top in crystallizer can be added into discontinuously, the covering slag Rotating fields of full liquid is formed on the top of molten steel, heat flux in mold is reduced when increasing the consumption of liquid covering slag, significantly improve surface quality of continuously cast slab.

nullThe method and the device that improve casting blank of continuous casting machine surface quality by adding covering slag according to the present invention,It is characterized in that,Described crystallizer liquid covering slag adds system and includes crucible、Induction heater、Stopper bar、Liquid covering slag allotter、Mozzle and crystallizer insulation cover,Wherein,The covering slag flow passage at crucible center is provided with the stopper bar that can move up and down along duct,Crucible bottom is then provided with liquid covering slag allotter and the mozzle being connected with its allotter,Crucible、All circulating type is provided with induction heater outside liquid covering slag allotter and mozzle,Solid-state covering slag in crucible is heated into liquid covering slag by this induction heater,Heating in crucible is formed liquid mold flux and will inject the crystallizer opening part on crystallizer top by mozzle by liquid covering slag allotter again,Liquid mold flux forms the covering slag Rotating fields of full liquid on the top of molten steel,Crystallizer insulation cover then it is provided with at crystallizer opening part.

Purpose of design is in that herein, adopts stopper bar flow control in liquid covering slag adition process, by the height of plug rod mechanism adjusting plug bar, protects the THICKNESS CONTROL liquid covering slag addition of slag blanket according to liquid, and then controls the flow of liquid covering slag outflow crucible.In adition process, it is necessary to during termination, shut-off plug bar;Restart to add fashionable, open stopper bar.Compared to other mechanisms such as slide plates; not easily slagging scorification blocking liquid covering slag mouth; then it is provided with crystallizer insulation cover at crystallizer opening part, reduces the radiation heat loss of the liquid protection slag blanket of the covering slag Rotating fields of full liquid in crystallizer, it is to avoid encrustation phenomena occurs on liquid protection slag blanket top.

Improve method and the device of casting blank of continuous casting machine surface quality according to the present invention by adding covering slag, it is characterised in that described crucible, the liner of liquid covering slag allotter and mozzle, all adopt graphite material material.

Purpose of design is in that herein, and the heat-resisting quantity of graphite material is good, conduct electricity very well, calorific intensity is good, does not infiltrate with liquid covering slag, compares and the precious metal materials such as platinum, platinum alloy, molybdenum, low price.

The method and the device that improve casting blank of continuous casting machine surface quality by adding covering slag according to the present invention; it is characterized in that; all circulating type is provided with induction heater outside described crucible, liquid covering slag allotter and mozzle; wherein it is looped around the induction heater outside liquid covering slag allotter and mozzle these parts are preheated and are incubated, reduces liquid covering slag thermal loss in transport flow process.

In order to avoid the overheated ionic reaction causing liquid covering slag, induction heater adopts medium-frequency induction heating technology.

The method and the device that improve casting blank of continuous casting machine surface quality by adding covering slag according to the present invention; it is characterized in that; described crystallizer liquid covering slag adds the liquid covering slag of the heating of system, and the temperature of this liquid covering slag controls between 1345 DEG C~1355 DEG C.

Technical purpose is in that herein, and the temperature of liquid covering slag controls between 1345 DEG C~1355 DEG C, and this temperature range section can ensure that the mobility of liquid covering slag, and mobility can be equal to viscosity, and viscosity hour mobility is good.

Use the present invention by adding covering slag and improve the method for casting blank of continuous casting machine surface quality and device obtaining following beneficial effect:

1. the method and the device that improve casting blank of continuous casting machine surface quality by adding covering slag of the present invention, adds liquid covering slag for conticaster, protects the thickness of slag blanket according to liquid, control the addition of liquid covering slag, is conducive to improving the surface quality of continuous casting billet;

2. the method and the device that improve casting blank of continuous casting machine surface quality by adding covering slag of the present invention; it it is the alternative of conventional conticaster solid-state covering slag Adding Way; there is universality, it is possible to be applied to square billet, the circle various conticaster such as base, slab, applied range.

Accompanying drawing explanation

Fig. 1 be the present invention be embodied as structure chart by what add that covering slag improves the method for casting blank of continuous casting machine surface quality and device.

In figure: 1-crystallizer, 1a-crystallizer opening part, 1b-molten steel, 1c-covering slag Rotating fields; A-crystallizer liquid covering slag adds system, A1-crucible, A11-covering slag flow passage, A2-induction heater; A3-stopper bar, A4-liquid covering slag allotter, A5-mozzle, A6-crystallizer insulation cover.

Detailed description of the invention

Below in conjunction with drawings and Examples to the present invention by adding covering slag and improve the method for casting blank of continuous casting machine surface quality and device being further described.

Embodiment

As it is shown in figure 1, improve method and the device of casting blank of continuous casting machine surface quality by adding covering slag, including crystallizer 1, its overall flow is as follows:

1) before conticaster casting starts; being added by solid-state covering slag in the crucible A1 that crystallizer liquid covering slag adds system A, after starting induction heater A2, crucible and solid-state covering slag are successively heated; after crucible is heated to uniform temperature, regulates heating power and ensure that the temperature of crucible can not be too high.Solid-state covering slag fusing after, continue to be heated to 1345 DEG C~1355 DEG C, make liquid covering slag temperature relatively small change time viscosity B coefficent little as far as possible;

2) step 1) in order to reduce liquid covering slag thermal loss in course of conveying; liquid covering slag is before flowing out crucible; the induction heater that liquid covering slag allotter A4 and mozzle A5 is arranged is opened, liquid covering slag allotter and mozzle are carried out preheating heating and insulation;

3) after conticaster casting starts; lift stopper bar A3; liquid covering slag is flowed in liquid covering slag allotter A4; then the crystallizer opening part 1a on crystallizer 1 top is arrived then through mozzle A5; last liquid covering slag flows into the top of the molten steel 1b in crystallizer, forms the covering slag Rotating fields 1c of full liquid;

4) in step 3, in order to reduce the radiation heat loss of the upper surface liquid covering slag in crystallizer, the crystallizer insulation cover A6 arranged on the top of crystallizer can be closed.

Crystallizer is connected with a crystallizer liquid covering slag at the crystallizer opening part 1a on top and adds system A;

Crystallizer liquid covering slag adds the system A liquid covering slag being heated by this crystallizer opening part 1a top injecting the molten steel 1b being positioned at crystallizer, forms the covering slag Rotating fields 1c of full liquid.

Crystallizer liquid covering slag addition system passes through the fusing control to solid-state covering slag, the flow-control to liquid covering slag, the conveying temperature drop control to liquid covering slag, the radiation heat loss's control etc. to crystallizer liquid protection slag blanket; substitute solid-state covering slag and add system; enable liquid covering slag covering slag controlled, can continuously, the molten steel top can being added into discontinuously in crystallizer; the covering slag Rotating fields of full liquid is formed on the top of molten steel; reduce heat flux in mold when increasing the consumption of liquid covering slag, significantly improve surface quality of continuously cast slab.

nullCrystallizer liquid covering slag adds system A and includes crucible A1、Induction heater A2、Stopper bar A3、Liquid covering slag allotter A4、Mozzle A5 and crystallizer insulation cover A6,Wherein,The covering slag flow passage A11 at crucible center is provided with the stopper bar that can move up and down along duct,Crucible bottom is then provided with liquid covering slag allotter and the mozzle being connected with its allotter,Crucible、All circulating type is provided with induction heater outside liquid covering slag allotter and mozzle,Solid-state covering slag in crucible is heated into liquid covering slag by this induction heater,Heating in crucible is formed liquid mold flux and will inject the crystallizer opening part 1a on crystallizer 1 top by mozzle by liquid covering slag allotter again,Liquid mold flux forms the covering slag Rotating fields 1c of full liquid on the top of molten steel 1b,Crystallizer insulation cover then it is provided with at crystallizer opening part.

Liquid covering slag adition process adopts stopper bar flow control, by the height of plug rod mechanism adjusting plug bar, protects the THICKNESS CONTROL liquid covering slag addition of slag blanket according to liquid, and then control the flow of liquid covering slag outflow crucible.In adition process, it is necessary to during termination, shut-off plug bar;Restart to add fashionable, open stopper bar.Compared to other mechanisms such as slide plates; not easily slagging scorification blocking liquid covering slag mouth; then it is provided with crystallizer insulation cover at crystallizer opening part, reduces the radiation heat loss of the liquid protection slag blanket of the covering slag Rotating fields of full liquid in crystallizer, it is to avoid encrustation phenomena occurs on liquid protection slag blanket top.

Crucible A1, the liner of liquid covering slag allotter A4 and mozzle A5, all adopt graphite material material.

The heat-resisting quantity of graphite material is good, conduct electricity very well, calorific intensity is good, does not infiltrate with liquid covering slag, compares and the precious metal materials such as platinum, platinum alloy, molybdenum, low price.

Induction heater A2 all it is provided with in circulating type outside crucible A1, liquid covering slag allotter A4 and mozzle A5; wherein it is looped around the induction heater outside liquid covering slag allotter and mozzle these parts are preheated and are incubated, reduces liquid covering slag thermal loss in transport flow process.

In order to avoid the overheated ionic reaction causing liquid covering slag, induction heater adopts medium-frequency induction heating technology.

Crystallizer liquid covering slag adds the liquid covering slag of the heating of system A, and the temperature of this liquid covering slag controls between 1345 DEG C~1355 DEG C.

The temperature of liquid covering slag controls between 1345 DEG C~1355 DEG C, and this temperature range section can ensure that the mobility of liquid covering slag, and mobility can be equal to viscosity, and viscosity hour mobility is good.

It addition, for slab formula conticaster, in order to reduce the submersed nozzle impact on crystallizer top liquid covering slag laminar flow, can be respectively provided with a mozzle in the left and right sides of submersed nozzle, the allocated device of liquid covering slag is diverted to two mozzles.Perforate on crystallizer insulation cover, liquid covering slag is entered crystallizer by adding hand-hole.

The method and the device that improve casting blank of continuous casting machine surface quality by adding covering slag of the present invention, adds liquid covering slag for conticaster, protects the thickness of slag blanket according to liquid, control the addition of liquid covering slag, is conducive to improving the surface quality of continuous casting billet;And the present invention is the alternative of conventional conticaster solid-state covering slag Adding Way, there is universality, it is possible to be applied to square billet, the circle various conticaster such as base, slab, applied range.

Claims (9)

1., by adding the method that covering slag improves casting blank of continuous casting machine surface quality, including crystallizer (1), its overall flow is as follows:
1) before conticaster casting starts; solid-state covering slag is added in the crucible (A1) that crystallizer liquid covering slag adds system (A); after starting induction heater (A2); crucible and solid-state covering slag are successively heated; after crucible is heated to uniform temperature, regulates heating power and ensure that the temperature of crucible can not be too high.Solid-state covering slag fusing after, continue to be heated to 1345 DEG C~1355 DEG C, make liquid covering slag temperature relatively small change time viscosity B coefficent little as far as possible;
2) step 1) in order to reduce liquid covering slag thermal loss in course of conveying; liquid covering slag is before flowing out crucible; the induction heater that liquid covering slag allotter (A4) and mozzle (A5) are arranged is opened, liquid covering slag allotter and mozzle are carried out preheating heating and insulation;
3) after conticaster casting starts; lift stopper bar (A3); liquid covering slag is flowed in liquid covering slag allotter (A4); then the crystallizer opening part (1a) on crystallizer (1) top is arrived then through mozzle (A5); last liquid covering slag flows into the top of the molten steel (1b) in crystallizer, forms the covering slag Rotating fields (1c) of full liquid;
4) in step 3, in order to reduce the radiation heat loss of the upper surface liquid covering slag in crystallizer, the crystallizer insulation cover (A6) arranged on the top of crystallizer can be closed;
The described crystallizer (1) the crystallizer opening part (1a) on top is connected with a crystallizer liquid covering slag and adds system (A);
The liquid covering slag that described crystallizer liquid covering slag addition system (A) is heated injects the top of the molten steel (1b) being positioned at crystallizer by this crystallizer opening part (1a), forms the covering slag Rotating fields (1c) of full liquid.
null2. as claimed in claim 1 by adding the method that covering slag improves casting blank of continuous casting machine surface quality,It is characterized in that,Described crystallizer liquid covering slag adds system (A) and includes crucible (A1)、Induction heater (A2)、Stopper bar (A3)、Liquid covering slag allotter (A4)、Mozzle (A5) and crystallizer insulation cover (A6),Wherein,The covering slag flow passage (A11) at crucible center is provided with the stopper bar that can move up and down along duct,Crucible bottom is then provided with liquid covering slag allotter and the mozzle being connected with its allotter,Crucible、All circulating type is provided with induction heater outside liquid covering slag allotter and mozzle,Solid-state covering slag in crucible is heated into liquid covering slag by this induction heater,Liquid covering slag allotter will heat in crucible and form liquid mold flux and will inject the crystallizer opening part (1a) on crystallizer (1) top by mozzle,Liquid mold flux forms the covering slag Rotating fields (1c) of full liquid on the top of molten steel (1b),Crystallizer insulation cover then it is provided with at crystallizer opening part.
3. as claimed in claim 2 by adding the method that covering slag improves casting blank of continuous casting machine surface quality; it is characterized in that; described crucible (A1), the liner of liquid covering slag allotter (A4) and mozzle (A5), all adopt graphite material material.
4. as claimed in claim 2 by adding the method that covering slag improves casting blank of continuous casting machine surface quality; it is characterized in that; described crucible (A1), liquid covering slag allotter (A4) and mozzle (A5) are outside is all provided with induction heater (A2) in circulating type; wherein it is looped around the induction heater outside liquid covering slag allotter and mozzle these parts are preheated and are incubated, reduces liquid covering slag thermal loss in transport flow process.
5. as claimed in claim 1 by adding the method that covering slag improves casting blank of continuous casting machine surface quality; it is characterized in that; described crystallizer liquid covering slag adds the liquid covering slag of the heating of system (A), and the temperature of this liquid covering slag controls between 1345 DEG C~1355 DEG C.
null6. the device of casting blank of continuous casting machine surface quality is improved by adding covering slag,It is characterized in that,Described crystallizer liquid covering slag adds system (A) and includes crucible (A1)、Induction heater (A2)、Stopper bar (A3)、Liquid covering slag allotter (A4)、Mozzle (A5) and crystallizer insulation cover (A6),Wherein,The covering slag flow passage (A11) at crucible center is provided with the stopper bar that can move up and down along duct,Crucible bottom is then provided with liquid covering slag allotter and the mozzle being connected with its allotter,Crucible、All circulating type is provided with induction heater outside liquid covering slag allotter and mozzle,Solid-state covering slag in crucible is heated into liquid covering slag by this induction heater,Liquid covering slag allotter will heat in crucible and form liquid mold flux and will inject the crystallizer opening part (1a) on crystallizer (1) top by mozzle,Liquid mold flux forms the covering slag Rotating fields (1c) of full liquid on the top of molten steel (1b),Crystallizer insulation cover then it is provided with at crystallizer opening part.
7. the device improving casting blank of continuous casting machine surface quality by adding covering slag as claimed in claim 6; it is characterized in that; described crucible (A1), the liner of liquid covering slag allotter (A4) and mozzle (A5), all adopt graphite material material.
8. the device improving casting blank of continuous casting machine surface quality by adding covering slag as claimed in claim 6; it is characterized in that; described crucible (A1), liquid covering slag allotter (A4) and mozzle (A5) are outside is all provided with induction heater (A2) in circulating type; wherein it is looped around the induction heater outside liquid covering slag allotter and mozzle these parts are preheated and are incubated, reduces liquid covering slag thermal loss in transport flow process.
9. the device improving casting blank of continuous casting machine surface quality by adding covering slag as claimed in claim 6; it is characterized in that; described crystallizer liquid covering slag adds the liquid covering slag of the heating of system (A), and the temperature of this liquid covering slag controls between 1345 DEG C~1355 DEG C.
CN201410817669.XA 2014-12-19 2014-12-19 Method and device for improving surface quality of cast blank of continuous casting machine by adding covering slag CN105750519A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106825480A (en) * 2017-02-23 2017-06-13 中钢集团邢台机械轧辊有限公司 A kind of Adding Way of the covering slag for pouring into a mould centrifugal roller

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Publication number Priority date Publication date Assignee Title
KR20020052121A (en) * 2000-12-23 2002-07-02 이구택 A mold flux having a larger interfacial thermal resistance in the continuous casting of steel
CN101472693A (en) * 2006-06-22 2009-07-01 Posco公司 Mold flux and continuous casting method using the same
CN101472694A (en) * 2006-06-23 2009-07-01 Posco公司 Continuous casting machine using molten mold flux
US20090165987A1 (en) * 2006-06-23 2009-07-02 Jung Wook Cho Continuous casting machine and method using molten mold flux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020052121A (en) * 2000-12-23 2002-07-02 이구택 A mold flux having a larger interfacial thermal resistance in the continuous casting of steel
CN101472693A (en) * 2006-06-22 2009-07-01 Posco公司 Mold flux and continuous casting method using the same
CN101472694A (en) * 2006-06-23 2009-07-01 Posco公司 Continuous casting machine using molten mold flux
US20090165987A1 (en) * 2006-06-23 2009-07-02 Jung Wook Cho Continuous casting machine and method using molten mold flux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106825480A (en) * 2017-02-23 2017-06-13 中钢集团邢台机械轧辊有限公司 A kind of Adding Way of the covering slag for pouring into a mould centrifugal roller
CN106825480B (en) * 2017-02-23 2019-06-21 中钢集团邢台机械轧辊有限公司 A kind of Adding Way for the covering slag being poured centrifugal roller

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