CN104236977B - A kind of decision method of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio - Google Patents
A kind of decision method of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio Download PDFInfo
- Publication number
- CN104236977B CN104236977B CN201410519934.6A CN201410519934A CN104236977B CN 104236977 B CN104236977 B CN 104236977B CN 201410519934 A CN201410519934 A CN 201410519934A CN 104236977 B CN104236977 B CN 104236977B
- Authority
- CN
- China
- Prior art keywords
- slag
- film
- solidified flux
- flux film
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Continuous Casting (AREA)
Abstract
The invention discloses the decision method of a kind of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio, continuous crystallizer protecting slag is heated to being completely melt and formed uniform molten bath by silicon molybdenum stove in graphite crucible；HF 200 slag film heat flux simulation instrument is utilized to obtain the Solidified Flux Film of covering slag；Rapid for slag in graphite crucible shrend is obtained corresponding shrend slag specimen；Respectively Solidified Flux Film and Water Quenching Slag are carried out according to same heating schedule heat and analyzes test, differential scanning calorimeter record sample DSC curve in temperature-rise period, can get the crystallization ratio of Solidified Flux Film by analyzing the DSC curve of slag film and Water Quenching Slag；The invention provides a kind of by the method for crystal proportion quantification in covering slag Solidified Flux Film, its result can be used for characterizing the heat-transfer character of covering slag Solidified Flux Film, and the design to continuous crystallizer protecting slag has directive significance.
Description
Technical field
The present invention relates to the decision method of a kind of physical property to continuous crystallizer protecting slag Solidified Flux Film, especially will protection
Crystal proportion quantitative method in slag Solidified Flux Film.
Background technology
Crystallizer protecting residue is the important metallurgical function material used in casting process, to ensureing the direct motion of cast and good casting
Base quality plays extremely crucial effect.Joining the granulated slag on crystallizer molten steel surface relies on the heat of molten steel offer gradually to be added
Heat, finally forms liquid slag layer on molten steel face.After melt cinder is flowed between green shell and crystallizer, near strand side temperature relatively
High formation melt cinder film, the closer to crystallizer, temperature is the lowest, and along with the reduction of temperature, melt cinder solidification forms Solidified Flux Film,
Near crystallizer side, melt cinder rapidly cools to form glassy layer (such as Fig. 1).Therefore, the solid slag between green shell and crystallizer
Film actually contains crystal and glass biphase (such as Fig. 2).On the one hand, the crystal in Solidified Flux Film can effectively hinder heat
From green shell to the lateral transport of crystallizer, this Slow cooling contributing to realizing green shell, thus be conducive to avoiding casting billet surface to indulge
The generation of crackle；On the other hand, increase crystal proportion in Solidified Flux Film, will be reduced by the heat flow density of slag film,
The thickness of initial solidification shell is the most thinning, and the frictional force that the thinnest green shell is difficult to bear between itself and crystallizer wall the most likely goes out
The situation of existing bleed-out.Therefore, only by crystal proportion in Solidified Flux Film, i.e. crystallization ratio controls in the range of reasonably,
Just can coordinate in casting process the contradiction between lubricating and conducting heat, the final slab quality realizing pouring into a mould direct motion and having obtained.
Solidified Flux Film crystallization than can be used for characterize slag film heat-transfer character, be research worker extremely pay close attention to when design protection slag one
Individual physical parameter.But for how by crystal proportion quantification in covering slag Solidified Flux Film, existing research method is still
Deficiency of both so existing.First is the Solidified Flux Film not obtaining being suitable for judging slag membrane crystallization ratio.The experimental results
Showing, the cooling condition of melt cinder has large effect to the crystallization ratio of Solidified Flux Film, say, that obtain under Different Cooling Conditions
Solidified Flux Film, crystallization ratio result differ.At present, the Solidified Flux Film that covering slag is formed in continuous cast mold can
Directly obtain in industry spot, but owing to field condition is not fixing (such as pulling rate, liquid steel temperature, sample position and time etc.),
The slag membrane sample obtained is made not have representativeness and repeatability.Second is to the Solidified Flux Film got, the most mostly by grand
The method that sight or microcosmic are directly observed qualitatively judges slag membrane crystallization ratio.Even if can observe under optical microscope or scanning electron microscope
The pattern of crystal in slag film, but the region owing to observing is limited, and the boundary line of crystal and glass is difficult to determine,
The most directly observe slag membrane structure to be difficult to obtain accurate slag membrane crystallization and compare result.X-ray diffraction technology can also be used for research
Crystal in slag film, however it is necessary that and diffraction data carries out substantial amounts of correction and just can be tied after complicated computing
Really, and to select different parameters to carry out calculated result difference bigger.
Therefore, want the accurate ratio obtained in Solidified Flux Film shared by crystal, need to obtain suitable Solidified Flux Film, this
The slag film acquisition methods that patent is used is to utilize HF-200 slag film heat flux simulation instrument (such as Fig. 1) to obtain slag film at laboratory,
Being passed through in the copper probe of cooling water is immersed in slag and make liquid covering slag cooled and solidified, melt cinder forms Solidified Flux Film postadhesion at copper
In probe head wall, after a period of time, probe is promoted to original height, and the Solidified Flux Film (such as Fig. 2) being attached in probe head wall can
As crystallization than the slag membrane sample tested.Owing to there being noncrystal existence in Solidified Flux Film, therefore slag film can be put in heating process
Go out heat, and liberated heat is proportional to non-crystal quality in slag film, replace the amorphous in slag film with slag water quenching slag
Body, utilizes differential scanning calorimetry to measure liberated heat in slag film and Water Quenching Slag (noncrystal) heating process respectively, by slag
Thermal discharge in film heating process compares with the thermal discharge of unit mass Water Quenching Slag heating process, just can obtain slag film quantitative
Crystallization compare result.
Summary of the invention
It is an object of the invention to for above-mentioned the deficiencies in the prior art, it is proposed that the judgement of a kind of covering slag Solidified Flux Film crystallization ratio
Method, in the forming process of laboratory simulation industry spot slag film, obtains under given conditions and is suitable for crystallization than consolidating of judging
State slag film, and to obtaining judging the concrete side of Solidified Flux Film crystallization ratio after the physical property of slag film is detected
Method.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is a kind of continuous crystallizer protecting slag Solidified Flux Film
The decision method of crystallization ratio, it is characterised in that include with acquisition after differential scanning calorimeter detection Solidified Flux Film and slag water quenching
Heat enthalpy value in Water Quenching Slag film temperature-rise period and Analysis of test results is processed；
Comprise the steps: by differential scanning calorimeter detection Solidified Flux Film physical property
1) weigh Solidified Flux Film powder sample 10mg to 15mg with electronic balance, be positioned in corundum crucible；
2) utilize differential scanning calorimeter, will be equipped with the crucible of sample from room temperature with the heating rate of 10 20 DEG C/min
To 900 1300 DEG C, obtaining sample DSC curve in heating process, abscissa is temperature T, and unit is DEG C；Vertical seat
Being designated as rate of heat flow, unit is mw.mg-1；Whole process is passed through protective gas, and flow is 50mL/min；
3), after test terminates, the thermal analysis software supporting with thermal analyzer is utilized test result to be exported in text document
For crystallizing the calculating of ratio；
4) the heat analysis testing result of Water Quenching Slag film powder sample is obtained by same method.
Analysis of test results is processed and comprises the steps:
1) DSC curve (convex for exothermic peak) is made according to the detection data importing to the Solidified Flux Film in text document,
Abscissa is temperature T (DEG C), and vertical coordinate is rate of heat flow y (mw.mg-1), from DSC curve, determine the starting point of exothermic peak
The end point (Tn, yn) of (Tm, ym) and exothermic peak, is connected the datum line as exothermic peak with straight line between starting point with end point；
2) according to starting point (Tm, ym) and the end point (Tn, yn) of exothermic peak, byCalculate Tm
And y value bx of datum line corresponding to arbitrary temp Tx (Tm < Tx < Tn) between Tn；
3)TmWith TnBetween temperature Tm, Tm+1..., Tx..., TnCorresponding rate of heat flow is ym, ym+1...,
yx..., yn, the datum line y value corresponding to each temperature is bm, bm+1..., bx..., bn, accordingly byCalculate the area A of exothermic peakm；
4) make the DSC curve of Water Quenching Slag film by same method and calculate the area A of exothermic peakn；
5) byCalculate ratio k shared by crystal in Solidified Flux Film.
Further feature is: the Solidified Flux Film powder sample weighed or the quality of Water Quenching Slag membrane sample powder be 10mg extremely
15mg。
The pretreatment of Solidified Flux Film elder generation, pretreatment comprises the steps:
1) take a number of continuous crystallizer protecting slag, be dividedly in some parts in graphite crucible and be positioned in silicon molybdenum stove；Will
Fire box temperature rises to 1,350 1400 DEG C and constant temperature a period of time, makes composition and the homogeneous temperature of slag；
2) pressing " location " button on HF-200 slag film heat flux simulation instrument control panel, alignment system is unlocked, two
Location bar begins to decline, and when the lower surface positioning bar has just touched slag liquid level, location bar stops declining, immediately on the bar of location
Rise to original height, position complete；The distance that location bar declines is copper probe and immerses the height that should decline in slag；
3) open cooling water, adjust effusion meter and make cooling water flow stable, open water heater and adjust cooler-water temperature until water
Temperature is stable at 35 DEG C ± 3.5 DEG C, presses " test " button on HF-200 slag film heat flux simulation instrument control panel, and copper is popped one's head in
Beginning to decline, when copper probe upper surface is concordant with slag liquid level, probe stops declining test simultaneously and starts；After test terminates,
Copper probe is increased to original height, takes off the Solidified Flux Film being attached in copper probe head wall, obtains Solidified Flux Film sample；Take graphite
Part slag in crucible is after shrend, it is thus achieved that corresponding Water Quenching Slag membrane sample；
4) grind into powder after Solidified Flux Film and Water Quenching Slag film being dried, powder is used after 200 mesh dusting covers are sieving through
The powder sample of Solidified Flux Film and the powder sample of Water Quenching Slag film in heat analysis test.
The present invention is relative to prior art, and it has the beneficial effect that
The present invention is by the forming process of the HF-200 slag film heat flux simulation instrument slag film in laboratory simulation and at fixing bar
The slag membrane sample that can be used for heat analysis test has been produced, it is proposed that can be by shared by crystal in continuous casting covering slag Solidified Flux Film under part
The detection technique of ratio quantification and the method for analysis, for being fully understood by slag membrane structure and holding the crystallization heat transfer of Solidified Flux Film comprehensively
Characteristic provides foundation.Sample preparation is convenient, and stable equipment operation is reliable, and computational methods are the most feasible, to continuous cast mold
The composition design of covering slag, laboratory research and performance evaluation all have certain reference value.
Accompanying drawing explanation
Accompanying drawing 1 is crystallizer protecting residue slag membrane structure schematic diagram in casting process.
Accompanying drawing 2 is the Temperature Distribution schematic diagram between crystallizer wall and green shell.
Accompanying drawing 3 is HF-200 slag film heat flux simulation instrument schematic diagram.
Accompanying drawing 4 is the Solidified Flux Film pictorial diagram being attached in copper probe head wall.
Accompanying drawing 5 is the DSC curve (convex for exothermic peak) in Solidified Flux Film and Water Quenching Slag film heating process.
Accompanying drawing 6 is the DSC curve (convex for exothermic peak) in low-carbon steel protecting slag Solidified Flux Film temperature-rise period.
Accompanying drawing 7 is the DSC curve (convex for exothermic peak) in low-carbon steel protecting slag Water Quenching Slag film temperature-rise period.
Accompanying drawing 8 is the DSC curve (convex for exothermic peak) in medium carbon steel covering slag Solidified Flux Film temperature-rise period.
Accompanying drawing 9 is the DSC curve (convex for exothermic peak) in medium carbon steel covering slag Water Quenching Slag film temperature-rise period.
In accompanying drawing, 1-submersed nozzle, 2-slag layer, 3-liquid slag layer, 4-crystallizer, 5-slag circle, 6-initial solidification shell, 7-liquid
Slag film, 8-crystalline state slag film, 9-glassy state slag film, 10-air gap, 11-crystallizer, 12-air gap, 13-glassy state slag film, 14-
Crystalline state slag film, 15-melt cinder film, 16-initial solidification shell, 17-cooling water pipe, 18-copper probe, 19-Solidified Flux Film, 20-liquid
State covering slag, 21-graphitic steel pot, 22-alumina pedestal, 23-thermocouple, 24-refractory material, 25-silicon molybdenum stove, 26-corundum
Boiler tube, 27-protects equipped with the corundum sleeve pipe of thermocouple, 28-covering slag Solidified Flux Film DSC curve in temperature-rise period, 29-
Slag Water Quenching Slag film DSC curve in temperature-rise period.
Detailed description of the invention
Below in conjunction with embodiment and the detailed description of the invention of the accompanying drawing detailed description present invention thereof, but the detailed description of the invention of the present invention
It is not limited to following embodiment.
The decision method of the present invention a kind of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio, implements step as follows:
With the Water Quenching Slag film obtained after differential scanning calorimeter detection Solidified Flux Film and slag (melt cinder or melt cinder film) shrend, heating up
During heat enthalpy value and Analysis of test results is processed, it is thus achieved that ratio k shared by crystal in Solidified Flux Film；
Described differential scanning calorimeter detection slag film and Water Quenching Slag film heat enthalpy value in temperature-rise period comprise the steps:
1) weigh certain mass Solidified Flux Film powder sample with electronic balance, be positioned in corundum crucible；
2) utilize differential scanning calorimeter, will be equipped with the crucible of sample from room temperature with the heating rate of 10 25 DEG C/min
To 900 1300 DEG C, obtaining sample DSC curve in heating process, abscissa is temperature T, and unit is DEG C；Vertical seat
Being designated as rate of heat flow, unit is mw.mg-1；During whole, in crucible, it is passed through protective gas；
3), after test terminates, the thermal analysis software supporting with thermal analyzer is utilized test result to be exported in text document
For crystallizing the calculating of ratio；The supporting thermal analysis software of thermal analyzer is prior art, or those skilled in the art according to
Present disclosure, it is possible to work out this thermal analysis software, by calculating and the process of this software, obtains present invention needs
Related data.
4) the heat analysis testing result of Water Quenching Slag membrane sample powder is obtained by same method；
The calculating of described crystallization ratio comprises the steps:
1) DSC curve is made according to the detection data importing to the Solidified Flux Film in text document, convex for exothermic peak,
Abscissa is temperature T (DEG C), and vertical coordinate is rate of heat flow y (mw.mg-1), from DSC curve, determine the starting point of exothermic peak
The end point (Tn, yn) of (Tm, ym) and exothermic peak, is connected the datum line as exothermic peak with straight line between starting point with end point；
2) according to starting point (Tm, ym) and the end point (Tn, yn) of exothermic peak, byCalculate Tm
And y value bx of datum line corresponding to arbitrary temp Tx (Tm < Tx < Tn) between Tn；
3)TmWith TnBetween temperature Tm, Tm+1..., Tx..., TnCorresponding rate of heat flow is ym, ym+1...,
yx..., yn, the datum line y value corresponding to each temperature is bm, bm+1..., bx..., bn, accordingly byCalculate the area A of exothermic peakm；
4) make the DSC curve of Water Quenching Slag film by same method and calculate the area A of exothermic peakn；
5) byCalculate ratio k shared by crystal in Solidified Flux Film.
The Solidified Flux Film powder sample weighed or the quality of Water Quenching Slag membrane sample powder are 10mg to 15mg.
If Solidified Flux Film meets the requirement of the present invention, the most directly choose；If not meeting application claims, need first pretreatment,
Pretreatment comprises the steps:
1) take a number of continuous crystallizer protecting slag, be dividedly in some parts in graphite crucible and be positioned in silicon molybdenum stove；Will
Fire box temperature rises to 1,350 1400 DEG C and constant temperature a period of time, makes composition and the homogeneous temperature of slag；
2) pressing " location " button on HF-200 slag film heat flux simulation instrument control panel, alignment system is unlocked, two
Location bar begins to decline, and when the lower surface positioning bar has just touched slag liquid level, location bar stops declining, immediately on the bar of location
Rise to original height, position complete；The distance that location bar declines is copper probe and immerses the height that should decline in slag；
3) open cooling water, adjust effusion meter and make cooling water flow stable, open water heater and adjust cooler-water temperature until water
Temperature is stable at 35 DEG C ± 3.5 DEG C, presses " test " button on HF-200 slag film heat flux simulation instrument control panel, and copper is popped one's head in
Beginning to decline, when copper probe upper surface is concordant with slag liquid level, probe stops declining test simultaneously and starts；After test terminates,
Copper probe is increased to original height, takes off the Solidified Flux Film being attached in copper probe head wall, obtains Solidified Flux Film sample；Take graphite
Part slag in crucible is after shrend, it is thus achieved that corresponding Water Quenching Slag membrane sample；
4) grind into powder after Solidified Flux Film and Water Quenching Slag film being dried, powder is used after 200 mesh dusting covers are sieving through
The powder sample of Solidified Flux Film and the powder sample of Water Quenching Slag film in heat analysis test.
First the present invention obtains Solidified Flux Film and corresponding shrend at use for laboratory HF-200 slag film heat flux simulation instrument at laboratory
Slag film, then carries out Solidified Flux Film and Water Quenching Slag film heat analysis test respectively and obtains DSC curve, and abscissa is temperature
T (DEG C), vertical coordinate is rate of heat flow y (mw.mg-1), calculate heat release in Solidified Flux Film and Water Quenching Slag film heating process the most respectively
The area at peak, and then gone out in Solidified Flux Film the ratio shared by crystal by the exothermic peak areal calculation of DSC curve.
The slag membrane structure of crystallizer protecting residue in casting process shown in Fig. 1, molten steel is injected into crystallizer by submersed nozzle 1
In, the fusing for the covering slag granulated slag 2 on mold liquid level simultaneously provides heat；Granulated slag 1 shape on molten steel face of fusing
Becoming liquid slag layer 3, melt cinder 3 is flowed between initial solidification shell 6 and crystallizer 4, and is formed about slag circle 5 at meniscus；Lean on
Nearly initial solidification shell 6 side, temperature higher formation melt cinder film 7；Near crystallizer 4 side, rate of cooling bigger formation glass
State slag film 9, is attended by volume contraction simultaneously and forms air gap 10 in slag film cooling procedure；Glassy state slag film 9 and melt cinder film 7 it
Between formed crystalline state slag film 8.
Temperature Distribution schematic diagram between crystallizer shown in Fig. 2 and solidified shell, between crystallizer 11 and solidified shell 16
Temperature be gradually increased with the increase of the distance away from crystallizer 14；One layer is had very between crystallizer 11 and glassy state slag film 13
Thin air gap 12；Near solidified shell 16 side is melt cinder 15, forms crystallization between melt cinder 15 and glassy state slag film 13
State slag film 14.
HF-200 slag film heat flux simulation instrument schematic diagram as shown in Figure 3, the graphite crucible 21 equipped with covering slag granulated slag is positioned over
On alumina pedestal 22 in corundum furnace tube 26；By silicon molybdenum stove 25, the granulated slag in graphite crucible 21 is added heat fusing, with
Time measured fire box temperature by the thermocouple 27 of crucible bottom, be refractory material 24 outside silicon molybdenum stove；When shape in graphite crucible 21
Uniformly behind molten bath 20, cooling water by cooling water pipe 17 be flowed into copper probe 18 in, melt cinder 20 be cooled after
Solidified Flux Film 19 is formed in probe head wall 18；The Inlet and outlet water temperature difference can be recorded by the thermocouple 23 in cooling water pipe 17.
DSC curve in Solidified Flux Film as shown in Figure 5 and Water Quenching Slag film heating process, in Solidified Flux Film heating process
One exothermic peak occurs on DSC curve 28；One exothermic peak occurs on the DSC curve 29 in Water Quenching Slag film heating process,
And exothermic peak area ratio slag film heat transfer peak area is big.
Embodiment
The present embodiment judging, the material of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio pours into a mould medium carbon steel as in industry spot
Covering slag with mild steel.Calculated results combines the feature showed in different steel grade casting process be analyzed, can
To further illustrate the concordance crystallized than the feasibility of decision method and value of calculation with Solidified Flux Film structure.
Comprising the concrete steps that of the present embodiment:
Solidified Flux Film is anticipated: take the slab continuous casting crystallizer protection slag for pouring into a mould mild steel after 350g removes charcoal in batches
Join in graphite crucible and be positioned in silicon molybdenum stove, fire box temperature being risen to 1400 DEG C and constant temperature makes the one-tenth of slag for 15 minutes
Divide and homogeneous temperature；
Pressing " location " button on HF-200 slag film heat flux simulation instrument control panel, alignment system is unlocked, and two fixed
Position bar begins to decline, and when the lower surface positioning bar has just touched slag liquid level, location bar stops declining, and location bar rises immediately
To original height, position complete；The distance that location bar declines is probe and immerses the height that should decline in slag；
Open cooling water, adjust effusion meter and make cooling water flow stable at 200L/h, open water heater adjustment cooler-water temperature straight
To water temperature stability at 35 DEG C ± 0.5 DEG C, press " test " button on HF-200 slag film heat flux simulation instrument control panel, copper
Probe begins to decline, and when copper probe upper surface is concordant with slag liquid level, probe stops decline and starts simultaneously at timing；After 45 seconds
Test terminates, and probe is increased to original height, takes off the Solidified Flux Film being attached in copper probe head wall, obtains Solidified Flux Film sample,
Part slag (about 50g) in graphite crucible is after rapid shrend, it is thus achieved that corresponding Water Quenching Slag membrane sample；
Grind into powder after Solidified Flux Film and Water Quenching Slag film being dried, powder be can be used for after 200 mesh dusting covers are sieving through
Heat analyzes powder sample and the powder sample of Water Quenching Slag film of the Solidified Flux Film of test；
Weigh slag film powder sample 10mg ± 2mg with electronic balance, be positioned in corundum crucible；
Utilize Germany's NETSCH STA 449F3Jupiter synchronous solving, will be equipped with the heating rate of 20 DEG C/min
The crucible of sample, from room temperature to 900 DEG C, obtains sample DSC curve in heating process, and abscissa is temperature T,
Unit is DEG C；Vertical coordinate is rate of heat flow, and unit is mw.mg-1；Whole process is passed through protective gas, such as indifferent gas such as argon
Body, or nitrogen, as protective gas, argon flow amount is 50mL/min；
After test terminates, utilize the thermal analysis software NETZSCH supporting with thermal analyzerThermal
Test data are exported to the calculating being used for crystallizing ratio in text document by Analysis；
Detection data according to the Solidified Flux Film imported in text document make DSC curve (convex for exothermic peak), as
Fig. 6 abscissa is temperature T (DEG C), and vertical coordinate is rate of heat flow y (mw.mg-1), from determining exothermic peak on DSC curve
Initial point (485 DEG C, 0.1438mw.mg-1) and exothermic peak end point (700 DEG C, 0.3918mw.mg-1), between starting point and end point
With the connected datum line as exothermic peak of straight line；
Starting point according to exothermic peak and end point, by bx=0.1438+0.0012 × (Tx-485) calculate between Tm and Tn
Y value bx of the datum line corresponding to arbitrary temp Tx (485 < Tx < 700)；
Temperature T between 485 DEG C and 700 DEG Cm, Tm+1..., Tx..., TnCorresponding rate of heat flow is 0.1438,
ym+1..., yx..., 0.3918, the datum line y value corresponding to each temperature is 0.1438, bm+1..., bx...,
0.3918, accordingly byCalculate the area A of exothermic peakm, AmResult of calculation
It is 12.78；
Make the DSC curve (such as Fig. 7) of low-carbon steel protecting slag Water Quenching Slag film by same method and calculate mild steel shrend
The area A at slag film heat transfer peakn, AnResult of calculation is 28.24；
ByCalculate ratio k shared by crystal in Solidified Flux Film；The meter of low-carbon steel protecting slag Solidified Flux Film crystallization ratio
Calculation result is k=1-12.78/28.24=0.547.
Be used for same method of testing producing the Solidified Flux Film of Mold Flux for Slab Casting of Medium-Carbon Steel covering slag and Water Quenching Slag film, by Solidified Flux Film and
Water Quenching Slag film carries out heat respectively and analyzes detection；The starting point of exothermic peak is drawn by the DSC curve of medium carbon steel covering slag Solidified Flux Film
For (498 DEG C, 0.1677mw.mg-1), end point be (582 DEG C, 0.2617mw.mg-1), as shown in Figure 8；Thus can calculate solid
The area of the exothermic peak occurred in state slag film heating process is 2.45；The initial of exothermic peak is drawn by the DSC curve of Water Quenching Slag film
Point for (486 DEG C, 0.09825mw.mg-1), end point be (596 DEG C, 0.2629mw.mg-1), as shown in Figure 9；Thus calculate
Water Quenching Slag film heat transfer peak area is 25.06；The ratio shared by crystal that calculates in medium carbon steel covering slag Solidified Flux Film is k=1-
2.45/25.06=0.902.
Being analyzed as follows result of calculation, the crystallization ratio of the Solidified Flux Film of the mild steel plate blank protecting slag calculated is 0.547, low
Crystallization ratio in Mold Flux for Slab Casting of Medium-Carbon Steel covering slag Solidified Flux Film.In conjunction with the steel grade that two kinds of carbon contents are different, in mild steel casting process
Casting billet surface is not easily formed longitudinal crack, and the Solidified Flux Film crystallization ratio calculated is on the low side, strand the heat transmitted to crystallizer
Relatively big, the green shell that can form adequate thickness reduces the generation of sticker type breakout accident；And medium carbon steel in process of setting due to
Peritectic reaction, easily produces surface longitudinal crack of slab along with volume contraction, and the medium carbon steel slag membrane crystallization ratio calculated is relatively
Height, this is conducive to controlling the heat transmission to crystallizer, it is achieved green shell Slow cooling, it is to avoid the generation of longitudinal crack.It is visible,
Calculated results meets the feature of pouring of two kinds of steel grades in actual production process, and value of calculation with the practical structures of Solidified Flux Film is
Consistent.
Claims (3)
1. the decision method of a continuous crystallizer protecting slag Solidified Flux Film crystallization ratio, it is characterised in that use differential scanning
The Water Quenching Slag film obtained after calorimeter detection Solidified Flux Film and slag water quenching, heat enthalpy value in temperature-rise period and to detection knot
Fruit analyzing and processing, it is thus achieved that ratio k shared by crystal in Solidified Flux Film；
Described differential scanning calorimeter detection Solidified Flux Film and Water Quenching Slag film heat enthalpy value in temperature-rise period include walking as follows
Rapid:
1) weigh certain mass Solidified Flux Film powder sample with electronic balance, be positioned in corundum crucible；
2) utilize differential scanning calorimeter, will be equipped with the crucible of sample from room temperature with the heating rate of 10 25 DEG C/min
To 900 1300 DEG C, obtaining sample DSC curve in heating process, abscissa is temperature T, and unit is DEG C；Vertical seat
Being designated as rate of heat flow, unit is mw.mg-1；During whole, in crucible, it is passed through protective gas；
3), after test terminates, the thermal analysis software supporting with thermal analyzer is utilized test result to be exported in text document
For crystallizing the calculating of ratio；
4) the heat analysis testing result of Water Quenching Slag membrane sample powder is obtained by same method；
The calculating of described crystallization ratio comprises the steps:,
1) DSC curve is made according to the detection data importing to the Solidified Flux Film in text document, convex for exothermic peak,
Abscissa is temperature T, and unit is DEG C, and vertical coordinate is rate of heat flow y, and unit is mw.mg-1, determine from DSC curve
Starting point Tm of exothermic peak, ym, and end point Tn of exothermic peak, yn, be connected with straight line between starting point with end point
Datum line as exothermic peak；
2) according to starting point Tm, the ym of exothermic peak, and end point Tn, yn, by
Calculate between Tm and Tn y value bx of datum line corresponding to arbitrary temp Tx (Tm < Tx < Tn)；
3)TmWith TnBetween temperature Tm, Tm+1..., Tx..., TnCorresponding rate of heat flow is ym, ym+1...,
yx..., yn, the datum line y value corresponding to each temperature is bm, bm+1..., bx..., bn, accordingly byCalculate the area A of exothermic peakm；
4) make the DSC curve of Water Quenching Slag film by same method and calculate the area A of exothermic peakn；
5) byCalculate ratio k shared by crystal in Solidified Flux Film.
The decision method of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio the most according to claim 1, it is characterised in that claim
The Solidified Flux Film powder sample taken or the quality of Water Quenching Slag membrane sample powder are 10mg to 15mg.
The decision method of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio the most according to claim 1, it is characterised in that Gu
The pretreatment of state slag film elder generation, pretreatment comprises the steps:
1) take a number of continuous crystallizer protecting slag, be dividedly in some parts in graphite crucible and be positioned in silicon molybdenum stove；Will
Fire box temperature rises to 1,350 1400 DEG C and constant temperature a period of time, makes composition and the homogeneous temperature of slag；
2) pressing " location " button on HF-200 slag film heat flux simulation instrument control panel, alignment system is unlocked, two
Location bar begins to decline, and when the lower surface positioning bar has just touched slag liquid level, location bar stops declining, immediately on the bar of location
Rise to original height, position complete；The distance that location bar declines is copper probe and immerses the height that should decline in slag；
3) open cooling water, adjust effusion meter and make cooling water flow stable, open water heater and adjust cooler-water temperature until water
Temperature is stable at 35 DEG C ± 3.5 DEG C, presses " test " button on HF-200 slag film heat flux simulation instrument control panel, and copper is popped one's head in
Beginning to decline, when copper probe upper surface is concordant with slag liquid level, probe stops declining test simultaneously and starts；After test terminates,
Copper probe is increased to original height, takes off the Solidified Flux Film being attached in copper probe head wall, obtains Solidified Flux Film sample；Take graphite
Part slag in crucible is after shrend, it is thus achieved that corresponding Water Quenching Slag membrane sample；
4) grind into powder after Solidified Flux Film and Water Quenching Slag film being dried, powder is used after 200 mesh dusting covers are sieving through
The powder sample of Solidified Flux Film and the powder sample of Water Quenching Slag film in heat analysis test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410519934.6A CN104236977B (en) | 2014-09-29 | 2014-09-29 | A kind of decision method of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410519934.6A CN104236977B (en) | 2014-09-29 | 2014-09-29 | A kind of decision method of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104236977A CN104236977A (en) | 2014-12-24 |
| CN104236977B true CN104236977B (en) | 2016-10-05 |
Family
ID=52225492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410519934.6A Expired - Fee Related CN104236977B (en) | 2014-09-29 | 2014-09-29 | A kind of decision method of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104236977B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241915B (en) * | 2015-09-23 | 2018-08-21 | 中南大学 | A kind of application process of the device of test high-temperature metallurgical slag performance |
| CN106370695B (en) * | 2016-11-03 | 2023-12-12 | 华北理工大学 | Device and method for measuring thermal resistance of continuous casting mold flux film |
| CN106825476A (en) * | 2016-12-28 | 2017-06-13 | 内蒙古包钢钢联股份有限公司 | The measuring method of Tundish Covering Flux for Continuous Casting molten steel surface slag blanket structure |
| CN106770427A (en) * | 2017-01-19 | 2017-05-31 | 南京师范大学 | A kind of heat analysis method for determining each phase constituent content of hypocrystalline macromolecular material |
| CN107462449B (en) * | 2017-08-02 | 2020-10-16 | 重庆大学 | Sample preparation method based on hot wire method |
| CN107843614B (en) * | 2017-09-18 | 2020-05-19 | 上海大学 | Method and device for high-flux characterization of heat and structure in melting-solidification process of crystal material |
| CN108562380A (en) * | 2018-04-15 | 2018-09-21 | 重庆大学 | A kind of powder exothermic mixture heating power test method |
| CN114441588A (en) * | 2020-11-05 | 2022-05-06 | 中国建筑材料科学研究总院有限公司 | Method and device for measuring granulated blast furnace slag content in cement |
| CN115808441B (en) * | 2023-02-08 | 2023-05-09 | 北京科技大学 | Metallurgical covering slag heat transfer performance testing device and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040105775A1 (en) * | 2002-11-14 | 2004-06-03 | Bryan Prucher | Method of manufacturing dispersion strengthened copper and/or hyper-nucleated metal matrix composite resistance welding electrodes |
| CN100495006C (en) * | 2006-09-29 | 2009-06-03 | 重庆大学 | Internal slag heat current inspector and inspection method for continuously-casting crystallizer |
| CN101844214A (en) * | 2009-03-23 | 2010-09-29 | 高妮 | Determination method of heat-flow density of plate blank continuous casting crystallizer |
| CN102520001B (en) * | 2011-12-06 | 2013-08-14 | 首钢总公司 | Crystallization behavior of slag material and determination method of crystallization temperature |
-
2014
- 2014-09-29 CN CN201410519934.6A patent/CN104236977B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN104236977A (en) | 2014-12-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104236977B (en) | A kind of decision method of continuous crystallizer protecting slag Solidified Flux Film crystallization ratio | |
| US4667725A (en) | Method for producing cast-iron, and in particular cast-iron which contains vermicular graphite | |
| CN100495006C (en) | Internal slag heat current inspector and inspection method for continuously-casting crystallizer | |
| CN102998324B (en) | Thermal analysis and detection method for solidification grain size of magnesium alloy melt | |
| CN101303319A (en) | Thermal analysis test method and apparatus of magnesium and magnesium alloy deteriorative processing tissue thinning effect | |
| Stefanescu et al. | 90 years of thermal analysis as a control tool in the melting of cast iron | |
| EP0805964A1 (en) | A sampling device for thermal analysis | |
| CN105880501A (en) | Method for measuring heat resistance of covering slag and crystallizer interface in continuous casting crystallizer | |
| CN102661967A (en) | Heat flow simulation test device of crystallizer meniscus horizontal heat transfer | |
| CN101396725B (en) | Pouring method and device capable of stabilizing the crystallizer molten steel surface temperature | |
| CN102430750B (en) | Method and device for carrying out online component detection and solidification structure control on magnesium alloy | |
| EP1056995B1 (en) | Device and process for thermal analysis of molten metals | |
| CN104155329A (en) | Continuous casting crystallizer protection slag solidification crystallization property test method | |
| Pedersen et al. | Temperature measurement during solidification of thin wall ductile cast iron. Part 1: Theory and experiment | |
| Hechu et al. | The use of infrared thermography to detect thermal instability during solidification of peritectic steels | |
| AU2007301495B2 (en) | An apparatus and method for determining the percentage of carbon equivalent, carbon and silicon in liquid ferrous metal | |
| CN102218515B (en) | Method for calculating molten steel solidification and heat transfer process in continuous casting crystallizer | |
| Ohno et al. | A critical condition for the formation of a coarse columnar γ grain structure in a peritectic solidified carbon steel | |
| CN205120633U (en) | Covering slag one dimensional heat transfer testing arrangement | |
| He et al. | Evolution of Dendrite Structure and Shrinkage Porosity in 30Cr15Mo1N Ingot with Pouring Rate | |
| CN107576679A (en) | A kind of method for the ESR ingot Local cooling speed for demarcating electroslag remelting production high-speed steel process | |
| CN105969930A (en) | Optimal control method for base iron overheating temperature and heat preservation time of ductile iron | |
| Ohno et al. | Experimental Verification of a Critical Condition for the Formation of As-Cast Coarse Columnar Austenite Grain Structure in a Hyperperitectic Carbon Steel | |
| Loizaga et al. | Thermal analysis applied to estimation of solidification kinetics of Al–Si aluminium alloys | |
| CN115808441B (en) | Metallurgical covering slag heat transfer performance testing device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161005 Termination date: 20170929 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |