CN106694830B - Liquid covering slag mobility detection method - Google Patents
Liquid covering slag mobility detection method Download PDFInfo
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Abstract
The present invention relates to a kind of process for making continuous casting technology more particularly to a kind of liquid covering slag mobility-detected device and detection methods.A kind of liquid covering slag mobility detection method; by by covering slag required temperature fusing after; it pours on the V-type chute with certain inclination angle, the flow behavior of covering slag is evaluated with the length of flow of liquid covering slag, propose two kinds of judgment methods of temperature flowing and low temperature flow；Temperature flowing is for judging melt cinder in the inflow situation of molten steel meniscus, and according to steel grade type, different covering slags have suitable length range；Low temperature flow is used to judge the Expenditure Levels of melt cinder, and under conditions of chute inclination angle is 10 °, measuring temperature is 330 DEG C lower than steel grade liquidus temperature, is the foundation for judging low temperature flow quality with 10cm.Detection method, can lubrication and Expenditure Levels of the quick predict slag in continuous casting process to simulate mobility of the covering slag in slab and copper plate of crystallizer gap.
Description
Technical field
The present invention relates to a kind of process for making continuous casting technology more particularly to a kind of liquid covering slag mobility-detected device and
Detection method.
Background technique
Continuous casting covering slag is a kind of steel-making auxiliary function of being covered on molten steel surface in steel making working procedure conticaster crystallizer
Material, it have adiabatic heat-insulation, prevent molten steel oxidation, absorb molten steel in float be mingled with, lubricate between copper plate of crystallizer and slab
The multiple functions such as relative motion and Heat Transfer Control are last one of technical factors of steelmaking process control cc billet surface quality.
In general, covering slag is with CaO, SiO2Based on binary system, match CaF outside2、Na2O、Li2The fluxing agents such as O, and a small amount of
Al2O3, constituent elements and some other inevitable impurity (such as Fe such as MgO2O3, MnO) composition, be a kind of mixed type inorganic silicic acid
Salt material.Since the fusing point of covering slag is 400~500 DEG C lower than liquid steel temperature, to control the covering slag of opposite low melting point in molten steel
Surface can slowly melt, it is necessary to a certain amount of carbonaceous material is incorporated, such as carbon black and graphite.Carbonaceous material has very high molten
Point, can effectively prevent the aggregation of covering slag drop, to can be effectively controlled the burn-off rate of covering slag；And carbonaceous material again can be complete
Full burning becomes gas, does not pollute to covering slag, therefore be a kind of not only cheap but also practical framework material.
When mold powder cover is in molten steel surface, slag layer, sinter layer and liquid slag layer three-decker are from top to bottom formd,
Slag layer mainly plays a part of adiabatic heat-insulation, and liquid slag layer is mainly used to prevent molten steel oxidation and absorbs being mingled with for floating, and is
Sufficient molten slag is provided between slab and copper plate of crystallizer gap.These molten slags are made in the periodic vibration of crystallizer
Under, slab and copper sheet gap are continuously flowed into, and forms solid slag film and melt cinder film double-layer structure, melt cinder film plays lubricating action,
Slab drawing crack is prevented, solid slag film is in mainly glassy state or crystalline structure by morphosis point, and wherein crystalline structure is in porous again
Looks, the two has the entirely different capacity of heat transmission, therefore solid slag film plays crucial work to the heat-transfer capability of control crystallizer again
With.Once covering slag performance is bad, it cannot be guaranteed that the adequate thickness of liquid slag layer and sufficient consumption, will cause slab to generate
The surface defects such as slag inclusion, crackle, it is serious to keep resistance of billet withdrawal excessive and cause bleed-out accident.In the above-mentioned five functional of covering slag,
It is again the most basic with lubricating function, and determine that the performance indicator of lubricant effect is mainly exactly the mobility of liquid covering slag.But extremely
Until the present, the standard method for detecting covering slag performance only has fusion temperature and viscosity, and there is no unified methods for mobility.Due to
Mobility is the general performance form of setting temperature and viscosity, and Chinese patent CN104458497A proposes a kind of viscous by measurement
Degree-temperature curve is come the method that characterizes covering slag temperature flowing.It is substantially exactly to measure protection by temperature-viscosity curve
A kind of beginning setting temperature (this is morning published technology) of slag, and think that the temperature less than 1150 DEG C is exactly good fluidity,
It otherwise is poor.Though this method can characterize the mobility of slag to a certain extent, there are still its limitations:
1) rather too dogmatic using 1150 DEG C of evaluation criterions as covering slag quality, it is difficult to be suitble to all steel grades；
2) the definition standard for starting setting temperature is not known, so that this method preciseness is inadequate；
3) this method lays particular emphasis on viscosity, does not consider the section size started between setting temperature and complete solidification temperature；
4) the measurement period is long, and result is influenced by artificial judgement.
Mobility after covering slag fusing is to reflect its lubricating ability to slab in continuous casting process, is that exploitation covering slag is non-
Often important performance design factor, but mobility only is difficult to characterize so far without evaluation method by fusion temperature and viscosity.Liquid
Flowing of the covering slag between slab and copper plate of crystallizer gap is extremely complex, and during which thermal field is widely different.As close to crystallizer copper
Plate side, temperature is only at 300~500 DEG C or so, and slab side temperature is up to 1400 DEG C or more.In addition, crystallizer top with
Temperature of lower is also different, differs at 400 DEG C or so.In order to simulate liquid covering slag as far as possible in such complicated temperature condition
Under mobility, it is necessary to design a kind of detection method and detection device simple and practical, that slag fluidity can be reproduced very well,
This is highly desirable exploitation covering slag, and number is tried out at the scene that can greatly reduce covering slag, reduces experimentation cost.
Summary of the invention
The purpose of the present invention is to provide a kind of liquid covering slag mobility-detected device and detection method, the detection methods
It, can profit of the quick predict slag in continuous casting process to simulate mobility of the covering slag in slab and copper plate of crystallizer gap
Sliding and Expenditure Levels.
In order to achieve the above technical purposes, the present invention adopts the following technical scheme:
A kind of liquid covering slag mobility-detected device, including a chute, chute one end are supported with base support, are being flowed
The slot end is provided with plug closure, and the chute other end is placed on ground.
The chute uses V-type steel, and the material of V-type steel is stainless steel, and 90 ± 30 ° of angle.
The chute inclination angle is 5~30 °.
Further, the chute inclination angle is 10 °, and chute is long to be not less than 105cm.
A kind of liquid covering slag mobility detection method, the steps include:
The first step, finished product protection slag is toasted 2 hours at 600~800 DEG C or more, it is ensured that the carbonaceous during complete calcination is scaling-off
Material；
Second step weighs the complete slag specimen of calcination of a certain amount of G, is contained with high purity graphite crucible, temperature is being previously set
It spends and keeps the temperature 10~30min in the high temperature furnace of T；
The slag specimen being completely melt is quickly removed high temperature furnace by third step, and the chute for disposably toppling at room temperature have it is stifled
One end of head；
4th step, liquid covering slag flow downward along chute and gradually solidify, and measure the slag length of formation；
5th step measures length of the liquid covering slag on the chute with certain inclination angle to characterize its mobility.
The chute inclination angle is 10 °, and chute cross section is V-type, and v-angle is 90 °, and chute is long to be not less than 105cm, slag specimen
Weight G takes 50g；
Temperature flowing judgment method:
Ability of this method to judge slag inflow slab and copper plate of crystallizer gap near crystallizer molten steel meniscus
Size；T=1350 DEG C is taken, which represents the mean temperature of the position；Steel grade is classified, respectively by taking straight carbon steel as an example by carbon content
The temperature flowing of covering slag used in steel grade judges are as follows: ultra-low-carbon steel, carbon content < 0.005%, 40 ± 5cm of surveyed slag length；
Mild steel, carbon content 0.01~0.08%, 60 ± 5cm of surveyed slag length；Medium carbon steel, carbon content 0.08~0.20%, surveyed slag
85 ± 5cm of length；High-carbon steel, carbon content > 0.20%, 100 ± 5cm of surveyed slag length；When temperature flowing is lower than corresponding model
It when the lower limit enclosed, can determine that the liquid covering slag temperature flowing is poor, be not suitable for the continuous casting demand of corresponding steel grade；Work as temperature flowing
Property when being higher than the upper limit of corresponding range, illustrate that the protection slag melting point, viscosity are relatively low, be equally unfavorable for slab quality and technique control
System；
Low temperature flow judgment method:
This method is to judge that slag in the object phase state in crystallizer exit, takes T=Tll- 330, unit DEG C, T in formulall
For the liquidus temperature for being poured steel grade, the length of flow of slag at a temperature of this is measured, and using 10cm as measurement standard, lower than this length
The covering slag low temperature flow of degree is poor.
The present invention proposes a kind of simulation the covering slag detection device of mobility and side in slab and copper plate of crystallizer gap
Method, by after required temperature fusing, pouring into covering slag on the V-type chute with certain inclination angle, with the length of flow of melt cinder
The flow behavior of covering slag is evaluated, and proposes two kinds of judgment methods of temperature flowing and low temperature flow, the former is for sentencing
Melt cinder break in the inflow situation of molten steel meniscus, according to steel grade type, different covering slags have suitable length range；The latter uses
In the Expenditure Levels for judging melt cinder, under conditions of chute inclination angle is 10 °, measuring temperature is 330 DEG C lower than steel grade liquidus temperature,
It is the foundation for judging low temperature flow quality with 10cm.
Detection method of the invention, can be quickly to simulate mobility of the covering slag in slab and copper plate of crystallizer gap
Predict lubrication and Expenditure Levels of the slag in continuous casting process, compared with traditional detection fusion temperature, the method for viscosity, this method
Not only detection speed is fast, and more convenient, more acurrate.
Detailed description of the invention
Fig. 1 is liquid covering slag mobility-detected apparatus structure schematic diagram of the invention；
Fig. 2 is the Section A-A schematic diagram in Fig. 1.
In figure: 1 chute plug, 2 chutes, 3 base supports.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
Referring to Fig. 1 and Fig. 2, a kind of liquid covering slag mobility-detected device, including a chute 2,2 one end bottom of chute
Seat support 3 supports, and the end of chute 2 is provided with plug 1 and blocks, 2 other end of chute is placed on ground, the function of plug 1
It is to prevent liquid covering slag from overflowing chute from there.The chute 2 uses V-type angle steel, and V-type angle steel material is stainless steel, angle
It is 90 ± 30 °, generally taking v-angle is 90 °.
The chute inclination angle be 5~30 °, the present invention using chute inclination angle be 10 ° as detect benchmark, respective streams flute length
The high 18.5cm of 105cm, base support.
Taking chute inclination angle is 10 °, and chute is long to be not less than 105cm, and chute cross section is V-type, and v-angle is 90 °, as liquid
State covering slag mobility-detected device detects benchmark.
A kind of liquid covering slag mobility detection method, the steps include:
The first step, finished product protection slag is toasted 2 hours at 600~800 DEG C or more, it is ensured that the carbonaceous during complete calcination is scaling-off
Material；
Second step weighs the complete slag specimen of calcination of a certain amount of G, is contained with high purity graphite crucible, temperature is being previously set
It spends and keeps the temperature 10~30min in the high temperature furnace of T；
The slag specimen being completely melt is quickly removed high temperature furnace by third step, and the chute for disposably toppling at room temperature have it is stifled
One end of head；
4th step, liquid covering slag flow downward along chute and gradually solidify, and measure the slag length of formation；
5th step measures length of the liquid covering slag on the chute with certain inclination angle to characterize its mobility.
The chute inclination angle is 10 °, and chute cross section is V-type, and v-angle is 90 °, and chute is long to be not less than 105cm, slag specimen
Weight G takes 50g.
Temperature flowing judgment method:
Ability of this method to judge slag inflow slab and copper plate of crystallizer gap near crystallizer molten steel meniscus
Size, determines whether the lubricating ability of covering slag meets continuous casting demand.T=1350 DEG C is taken, which represents the flat of the position
Equal temperature.Steel grade is classified by taking straight carbon steel as an example by carbon content, the temperature flowing judgement of covering slag used in each steel grade are as follows: ultralow
The corresponding liquid covering slag suitable length of carbon steel, mild steel, medium carbon steel, high-carbon steel is as shown in table 1；When temperature flowing lower than pair
It when answering the lower limit of range, can determine that the covering slag temperature flowing is poor, be not suitable for the continuous casting demand of corresponding steel grade；If temperature flowing
Property when being higher than the upper limit of corresponding range, illustrate that the protection slag melting point, viscosity are relatively low, be equally unfavorable for slab quality and technique control
System.
Table 1
| Steel grade | Ultra-low-carbon steel | Mild steel | Medium carbon steel | High-carbon steel |
| Carbon content, wt% | <0.005 | 0.01~0.08 | 0.08~0.20 | >0.20 |
| Suitable length, cm | 40±5 | 60±5 | 85±5 | 100±5 |
Low temperature flow judgment method:
This method is to judge slag in the object phase state in crystallizer exit, due to the reduction of temperature herein, slab with
Great changes also have occurred in the ratio of solid slag film and melt cinder film in copper plate of crystallizer gap, are mainly shown as solid slag film increasingly
Thickness, melt cinder film are more and more thinner.If covering slag performance is improper, it may cause melt cinder film and completely disappeared in crystallizer exit,
All become solid slag film, so, the consumption of covering slag is just substantially reduced, easily initiation continuous casting accident.When detection, T is taken
=Tll- 330, unit DEG C, T in formulallFor the liquidus temperature for being poured steel grade, the length of flow of slag at a temperature of this is measured, and with
10cm is measurement standard, poor lower than the covering slag low temperature flow of this length, is not suitable for the continuous casting of the steel grade, is only more than
The covering slag of this length just can guarantee normal consumption.
The present invention characterizes its mobility by measuring length of the liquid covering slag on the chute with certain inclination angle, has
Have with the closer feature of covering slag use environment, when melting melt cinder at room temperature chute contact after also can moment Quench go out
Solid slag film, subsequent liquid covering slag flow downward along solid slag and continue to generate solid slag film, and with continuing for flowing, liquid is protected
The temperature of shield slag can be reduced quickly, stop flowing until solidifying completely.Viscosity is different, setting temperature is different, liquid covering slag
Length of flow it is different, therefore be that the comprehensive of viscosity and setting temperature embodies, more can really reflect that covering slag is actually using
Effect in the process.
In addition, the chute inclination angle of detection device of the invention also will affect the length of flow of liquid covering slag.Inclination angle is bigger,
Length is longer.For ease of description, the present invention (but not limited to this numerical value) by taking 10 ° of inclination angle as an example, respective streams flute length 105cm, pedestal
The high 18.5cm of bracket, chute cross section are V-type, and v-angle is 90 °, and corresponding slag specimen weight G takes 50g, substantially through practice test
The fluidity determining of all types melt cinder can be met.
The mobility-detected that slag under high temperature, cryogenic conditions can be carried out using the detection device of this dimensions, to sentence
The applicability of disconnected covering slag.
Embodiment 1:
Detect a kind of ultra-low-carbon steel (liquidus temperature Tll=1532 DEG C) use covering slag A mobility.Chute length used is not low
In 105cm, 10 ° of inclination angle, chute cross section is V-type, and v-angle is 90 °；
Temperature flowing tests specific steps are as follows:
(1) 150g finished product protection slag is toasted 2 hours with the big mouth container of SiC matter in 700 DEG C of constant temperature；
(2) slag specimen after weighing the complete calcination of 50g is contained with high purity graphite crucible, is kept the temperature in 1350 DEG C of high temperature furnace
15min；
(3) one for graphite crucible being quickly removed into high temperature furnace with fire tongs, and slag being disposably poured over that chute has plug
End；
(4) melt cinder flows downward along chute and gradually solidifies, and the slag length for measuring formation is 42cm.
Low temperature flow tests specific steps are as follows:
(5) slag specimen after weighing the complete calcination of 50g again is contained with high purity graphite crucible, is protected in 1202 DEG C of high temperature furnace
Warm 25min；
(6) one for graphite crucible being quickly removed into high temperature furnace with fire tongs, and slag being disposably poured over that chute has plug
End；
(7) melt cinder flows downward along chute and gradually solidifies, and the slag length for measuring formation is 15cm.
According to measurement result, temperature flowing length is 42cm, is located in table 1 in the range of 40 ± 5cm, low temperature flow length
For 15cm, it is greater than 10cm, when illustrating the slag for continuous casting of ultralow carbon steel production, the lubricant effect and consumption of generation, which are able to satisfy, to be wanted
It asks.
Embodiment 2:
Detect a kind of medium carbon steel (liquidus temperature Tll=1520 DEG C) use covering slag B mobility.Chute length used is not less than
105cm, 10 ° of inclination angle, chute cross section are V-type, and v-angle is 90 °；
Temperature flowing tests specific steps are as follows:
(1) 150g finished product protection slag is toasted 2.5 hours with the big mouth container of SiC matter in 700 DEG C of constant temperature；
(2) slag specimen after weighing the complete calcination of 50g is contained with high purity graphite crucible, is kept the temperature in 1350 DEG C of high temperature furnace
15min；
(3) one for graphite crucible being quickly removed into high temperature furnace with fire tongs, and slag being disposably poured over that chute has plug
End；
(4) melt cinder flows downward along chute and gradually solidifies, and the slag length for measuring formation is 84cm.
Low temperature flow tests specific steps are as follows:
(5) slag specimen after weighing the complete calcination of 50g again is contained with high purity graphite crucible, is protected in 1190 DEG C of high temperature furnace
Warm 25min；
(6) one for graphite crucible being quickly removed into high temperature furnace with fire tongs, and slag being disposably poured over that chute has plug
End；
(7) melt cinder flows downward along chute and gradually solidifies, and the slag length for measuring formation is 11cm.
According to measurement result, temperature flowing length is 84cm, is located in table 1 in the range of 85 ± 5cm, low temperature flow length
For 11cm, it is greater than 10cm, when illustrating the slag for medium carbon steel continuous casting, the lubricant effect and consumption of generation, which are able to satisfy, to be wanted
It asks.
The above is merely preferred embodiments of the present invention, be not intended to limit the scope of the present invention, therefore, it is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention should be included in protection model of the invention
Within enclosing.
Claims (3)
1. a kind of liquid covering slag mobility detection method, it is characterized in that:
The first step, finished product protection slag is toasted 2 hours at 600~800 DEG C or more, it is ensured that the charcoal material during complete calcination is scaling-off
Material；
Second step weighs the complete slag specimen of calcination of a certain amount of G, is contained with high purity graphite crucible, is being previously set temperature T's
10~30min is kept the temperature in high temperature furnace；
The slag specimen being completely melt is quickly removed high temperature furnace by third step, and the chute disposably toppled at room temperature has plug
One end；
4th step, liquid covering slag flow downward along chute and gradually solidify, and measure the slag length of formation；
5th step measures length of the liquid covering slag on the chute with certain inclination angle to characterize its mobility；
Described chute one end is supported with base support, and the chute end is provided with plug closure, and the chute other end is placed in ground
On.
2. liquid covering slag mobility detection method according to claim 1, it is characterized in that: the chute uses V-type steel,
The material of V-type steel is stainless steel, and 90 ± 30 ° of angle, chute inclination angle is 5~30 °.
3. liquid covering slag mobility detection method according to claim 1, it is characterized in that: the chute inclination angle is 10 °,
Chute cross section is V-type, and v-angle is 90 °, and chute is long to be not less than 105cm, and slag specimen weight G takes 50g；
Temperature flowing judgment method:
Capacity of water of this method to judge slag inflow slab and copper plate of crystallizer gap near crystallizer molten steel meniscus；
T=1350 DEG C is taken, which represents the mean temperature of the position；Steel grade is classified by taking straight carbon steel as an example by carbon content, each steel grade institute
Judged with the temperature flowing of covering slag are as follows: ultra-low-carbon steel, carbon content < 0.005%, 40 ± 5cm of surveyed slag length；Mild steel,
Carbon content 0.01~0.08%, 60 ± 5cm of surveyed slag length；Medium carbon steel, carbon content 0.08~0.20%, surveyed slag length 85
±5cm；High-carbon steel, carbon content > 0.20%, 100 ± 5cm of surveyed slag length；When temperature flowing is lower than the lower limit of corresponding range
When, it can determine that the liquid covering slag temperature flowing is poor, be not suitable for the continuous casting demand of corresponding steel grade；When temperature flowing be higher than pair
When answering the upper limit of range, illustrates that the protection slag melting point, viscosity are relatively low, be equally unfavorable for slab quality and technology controlling and process；
Low temperature flow judgment method:
This method is to judge slag in the object phase state in crystallizer exit；Take T=Tll- 330, unit DEG C, T in formulallTo pour
The liquidus temperature for infusing steel grade, measures the length of flow of slag at a temperature of this, and using 10cm as measurement standard, lower than this length
Covering slag low temperature flow is poor.
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