CN102207497B - Method for forecasting slag inclusion on surfaces of continuous casting slabs before rolling - Google Patents
Method for forecasting slag inclusion on surfaces of continuous casting slabs before rolling Download PDFInfo
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Abstract
The invention relates to a method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling and belongs to the technical field of surface quality control during continuous casting slab productions. The method comprises the following steps of (1) acquiring liquid level values of a crystallizer and corresponding casting lengths, (2) retrieving corresponding liquid level values according to casting lengths, calculating the differences of adjacent liquid level values of the crystallizer and determining if there are fluctuations in a liquid surface of the crystallizer, counting numbers of the fluctuations and calculating to obtain a fluctuation amplitude and a fluctuation speed during each one of the fluctuation, (3) comparing respectively the fluctuation amplitude and the fluctuation speed with a preset fluctuation amplitude standard value and a preset fluctuation speed standard value, and rating a scope determined by the comparison to obtain a fluctuation rate of the each one of the fluctuation, (4) determining a weight coefficient of the fluctuation rate of the each one of the fluctuation according to a preset weight coefficient of the fluctuation rate, and (5) adding all weight coefficients of fluctuation rates to obtain a slag-entrapment index, comparing the slag-entrapment index with a present slag-entrapment index standard value, determining if the casting slabs are qualified or not, and outputting and displaying a forecast. Through the method provided by the invention, surface qualities of casting slabs can be forecasted thereby being utilized for guidance of processing before rolling.
Description
Technical field
The present invention relates to a kind of method that slab surface slag defect is forecast, belong to continuous casting steel billet and produce the quality control on the surface technical field.
Background technology
Continuous casting is to connect the intermediate link of steel-making and rolling in Steel Production Flow Chart, and its Main Function is that high-temperature molten steel is cast into to the continuous casting billet with certain section configuration and dimensions.Because continuous casting billet quality directly affects follow-up rolling process, therefore realize that the early prediction of flawless continuous-casting billet production and continuous casting billet quality just seems particularly important.
The initial solidification forming process of molten steel has material impact to the surface quality of steel, and when wherein the slag inclusion on continuous casting billet surface causes rolling, plate surface generation strip inclusion defect is common main Quality with sticking up the skin defect.In crystallizer; interaction between molten steel-base shell-slag phase-copper coin is the dynamic process of a complexity; particularly the fluctuation meeting of crystallizer molten steel surface is involved in liquid covering slag in initial base shell, and steel, slag solidify rapidly together, makes continuous casting billet form subcutaneous dreg defect.With the continuous casting billet of dreg defect, when the rolling, slag inclusion is stretched along rolling direction, thereby form strip, is mingled with or sticks up the skin defect.But existing continuous casting can't be detected usually to the especially subcutaneous dreg defect of surface quality of continuously cast slab in producing, only have the sheet material later formed to rolling could find defect.Therefore, whether the continuous casting billet of existing iron and steel enterprise after to continuous casting production exists surface quality problems to feel unsure of, and whether needing to clear up the continuous casting billet surface is generally also to determine according to customer requirement.If customer requirement is high, will after the continuous casting billet complete liquidation, send to rolling; If customer requirement is not high, directly do not send to rolling after continuous casting billet all not being cleared up, whether continuous casting billet is cleared up fully in the blindness state.
Summary of the invention
The technical matters that the present invention solves is: propose a kind ofly before rolling, can carry out the method for accurate forecast to continuous casting billet surface slag inclusion situation, utilize the method can also instruct the processing of continuous casting billet before rolling.
In order to solve the problems of the technologies described above, the technical scheme that the present invention proposes is: a kind of method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling comprises the following steps:
1) by existing continuous casting billet production automation system, to set
sampling periodreal-time Collection also stores in the continuous casting cycle
the mould liquid level valuewith corresponding mould liquid level value
cast length;
2) according to producing the cast length of continuous casting billet, transfer the mould liquid level value to this continuous casting billet that should cast length, calculate
adjacent crystallizer level value poor, whether liquid level when the crystallizer intercrystalline to judge this continuous casting billet according to the positive and negative variation of the difference of adjacent crystallizer level value
fluctuationand statistics
the fluctuation number of times, according to what once fluctuate
mould liquid level large value and minimum valuecalculate this secondary undulation
fluctuating rangewith
velocity of wave motion, repeat above-mentioned calculating
every secondary undulationfluctuating range and velocity of wave motion,
----described fluctuating range is the mould liquid level value by the distance that is up to minimum or is changed to maximum one-time continuous by minimum,
It is minimum or by the minimum average velocity changed to the highest one-time continuous by being up to that----described velocity of wave motion is the mould liquid level value,
3) according to by the above-mentioned the 2nd) in step the fluctuating range of every secondary undulation and velocity of wave motion respectively with set
fluctuating range standard valuewith
the velocity of wave motion standard valuecarry out size more definite scope carry out
the fluctuation grading, obtain
every secondary undulation is commented level,
----described fluctuating range standard value and velocity of wave motion standard value are at least respectively one according to the property settings of existing conticaster and production steel grade, and described fluctuation grading is divided at least three
grading,
4) according to the characteristic of existing conticaster, be that each grading that described fluctuation is graded is set corresponding
each grading weight system number, the selected the above-mentioned the 3rd) and every secondary undulation grading of obtaining in step is corresponding
every secondary undulation grading weight coefficient;
5) every secondary undulation grading weight coefficient added and obtain this continuous casting billet
the slag index, by slag index and setting
slag standard of index valuerelatively, judge that whether this continuous casting billet is qualified and have or not slag and the output forecast shows, this continuous casting billet normally sent to roll line or cleared up,
----described slag standard of index value is at least one according to the property settings of producing steel grade;
6) repeat above-mentioned steps, complete the forecast to every continuous casting billet surface slag inclusion.
For continuous casting, produce, the liquid level fluctuation of molten steel in crystallizer is inevitably, and normal fluctuating range requires in be controlled at ± 2.5mm.But, in actual production, due to numerous influence factors, the fluctuating range of molten steel in mold liquid level often exceeds the standard range of control, when abnormal, can reach ± more than 10mm.The each fluctuating range of the corresponding mould liquid level of the continuous casting billet that the inventor produces by analytical calculation and velocity of wave motion, and continuous casting billet is graded and judged according to fluctuating range and the velocity standard value set, find the crystallizer level fluctuation to affect the concrete determination methods of surface quality of continuously cast slab, thereby provide foundation for the guidance of the forecast of the surface quality after continuous casting billet production and rolling pre-treatment.Therefore, the proposition of method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling of the present invention, judge and forecast provides a kind of completely new approach for surface quality of continuously cast slab, filled up existing continuous casting billet production and lacked the blank of surface quality of continuously cast slab forecast technique before continuous casting is accomplished to rolling.
The one of perfect of technique scheme is: the described the 3rd) in step, described fluctuating range standard value and velocity of wave motion standard value are respectively one, described fluctuation grading is divided into three gradings,
---the-the first grading is that described fluctuating range is less than the fluctuating range standard value and described velocity of wave motion is less than the velocity of wave motion standard value,
---the-the second grading is that described fluctuating range is more than or equal to the fluctuating range standard value and described velocity of wave motion is less than the velocity of wave motion standard value, or described fluctuating range is less than the fluctuating range standard value and described velocity of wave motion is more than or equal to the velocity of wave motion standard value,
----tri-gradings are that described fluctuating range is more than or equal to the fluctuating range standard value and described velocity of wave motion is more than or equal to the velocity of wave motion standard value;
The described the 5th) in step, described slag standard of index value is one,
----when described slag index is less than or equal to slag standard of index value, judge that this continuous casting billet is qualified to show without slag output forecast, and this continuous casting billet is normally sent to roll line,
----when described slag index is greater than slag standard of index value, judge that this continuous casting billet is defective and export the forecast demonstration, and this continuous casting billet is cleared up.
Perfect two of technique scheme is: the described the 3rd) in step, described fluctuating range standard value and velocity of wave motion standard value have respectively two, two fluctuating range standard values are respectively the first fluctuating range standard value and the second fluctuating range standard value, two velocity of wave motion standard values are respectively the first fluctuation velocity standard value and the second fluctuation velocity standard value, described fluctuation grading is divided into six gradings
---the-the first grading is that described fluctuating range is less than the first fluctuating range standard value and described velocity of wave motion is less than the first fluctuation velocity standard value,
---the-the second grading is that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, described velocity of wave motion is less than the first fluctuation velocity standard value simultaneously, perhaps described fluctuating range is less than the first fluctuating range standard value, described velocity of wave motion is more than or equal to the first fluctuation velocity standard value and is less than or equal to the second fluctuation velocity standard value simultaneously
----tri-gradings are that described fluctuating range is greater than the second fluctuating range standard value and described velocity of wave motion is less than the first fluctuation velocity standard value, perhaps described fluctuating range is less than the first fluctuating range standard value and described velocity of wave motion is greater than the second fluctuation velocity standard value
----tetra-gradings are that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, and described velocity of wave motion is more than or equal to the first fluctuation velocity standard value and is less than or equal to the second fluctuation velocity standard value simultaneously,
----five gradings are that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, described velocity of wave motion is greater than the second fluctuation velocity standard value simultaneously, perhaps described fluctuating range is greater than the second fluctuating range standard value, described velocity of wave motion is more than or equal to the first fluctuation velocity standard value and is less than or equal to the second fluctuation velocity standard value simultaneously
----six gradings are that described fluctuating range is greater than the second fluctuating range standard value and described velocity of wave motion is greater than the second fluctuation velocity standard value;
The described the 5th) in step, described slag standard of index value has two, is respectively first volume slagging index standard value and volume Two slagging index standard value,
----when described slag index is less than or equal to first volume slagging index standard value, judge that this continuous casting billet is qualified to show without slag output forecast, and this continuous casting billet is normally sent to roll line,
----when described slag index is greater than first volume slagging index standard value and be less than or equal to volume Two slagging index standard value, judging that this continuous casting billet is defective has a small amount of slag output forecast to show, and this continuous casting billet is carried out to part and clear up,
----when described slag index is greater than volume Two slagging index standard value, judging that this continuous casting billet is defective has a large amount of slags output forecast to show, this continuous casting billet is made an overall screening.
Perfect three of technique scheme is: the described the 3rd) in step, described fluctuating range standard value has respectively two, is respectively the first fluctuating range standard value and the second fluctuating range standard value, and described velocity of wave motion standard value is one, described fluctuation grading is divided into five gradings
---the-the first grading is that described fluctuating range is less than the first fluctuating range standard value and described velocity of wave motion is less than or equal to the velocity of wave motion standard value,
---the-the second grading is that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, and described velocity of wave motion is less than or equal to the velocity of wave motion standard value simultaneously,
----tri-gradings are that described fluctuating range is greater than the second fluctuating range standard value and described velocity of wave motion is less than or equal to the velocity of wave motion standard value, or described fluctuating range is less than the first fluctuating range standard value and described velocity of wave motion is greater than the velocity of wave motion standard value,
----tetra-gradings are that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, and described velocity of wave motion is greater than the velocity of wave motion standard value simultaneously,
----five gradings are that described fluctuating range is greater than the second fluctuating range standard value and described velocity of wave motion is greater than the velocity of wave motion standard value,
The described the 5th) in step, described slag standard of index value has two, is respectively first volume slagging index standard value and volume Two slagging index standard value,
----when described slag index is less than or equal to first volume slagging index standard value, judge that this continuous casting billet is qualified to show without slag output forecast, and this continuous casting billet is normally sent to roll line,
----when described slag index is greater than first volume slagging index standard value and be less than or equal to volume Two slagging index standard value, judging that this continuous casting billet is defective has a small amount of slag output forecast to show, and this continuous casting billet is carried out to part and clear up,
----when described slag index is greater than volume Two slagging index standard value, judging that this continuous casting billet is defective has a large amount of slags output forecast to show, this continuous casting billet is made an overall screening.
The one of further perfect of technique scheme is: described fluctuating range standard value is 5mm, and described velocity of wave motion standard value is 1.0mm/s, and described slag standard of index value is 0.3, and described each grading weight coefficient is respectively 0,0.01 and 0.15.
Further perfect two of technique scheme is: described the first fluctuating range standard value is 5mm, and described the second fluctuating range standard value is 10mm; Described the first fluctuation velocity standard value is 1.0mm/s, described the second fluctuation velocity standard value is 1.5mm/s, described first volume slagging index standard value is 0.3, and described volume Two slagging index standard value is 0.8, and described each grading weight coefficient is respectively 0,0.01,0.05,0.15,0.3 and 0.7.
Further perfect three of technique scheme is: described the first fluctuating range standard value is 4mm, and described the second fluctuating range standard value is 8mm; Described velocity of wave motion standard value is 1.2mm/s, and described first volume slagging index standard value is 0.2, and described volume Two slagging index standard value is 0.6, and described each grading weight coefficient is respectively 0,0.01,0.05,0.25,0.5.
Further improving of technique scheme is: the described sampling period is the 30-250 millisecond.Through inventor's further investigation, show, the sampling period is very crucial, because the liquid level fluctuation of crystallizer cycle is very short, guarantee to collect enough level values within cycle of fluctuation.The frequency difference that level value produces for different liquid level Control & data acquisition systems, therefore need to determine the suitable sampling period.
The accompanying drawing explanation
Below in conjunction with accompanying drawing, method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling of the present invention is described further.
Fig. 1 is the process flow diagram of method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling in the embodiment of the present invention.
Embodiment
Embodiment mono-
The method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling of the present embodiment as shown in Figure 1, comprises the following steps:
1) by existing continuous casting billet production automation system, with the sampling period Real-time Collections of 50 milliseconds and store the mould liquid level value of continuous casting in the cycle and the cast length of corresponding mould liquid level value;
2), according to producing the cast length of continuous casting billet, transfer the mould liquid level value L of this continuous casting billet in crystallizer that should cast length
i, calculate adjacent crystallizer level value L
idifference Δ L, Δ L=L
i+1-L
i, judge according to the difference Δ L of adjacent crystallizer level value whether this continuous casting billet liquid level when the crystallizer intercrystalline fluctuates and the statistical fluctuations frequency n, when Δ L is positive and negative while changing, illustrate once and fluctuate, record the mould liquid level maximal value L of this secondary undulation
maxwith minimum value L
min, and corresponding time T
maxand T
min, duration Δ T=T
max-T
min, calculate the fluctuating range Δ L of this secondary undulation
maxwith velocity of wave motion V, preserve each result of calculation, then repeat the above-mentioned fluctuating range Δ L that calculates every secondary undulation
maxwith velocity of wave motion V,
----fluctuating range Δ L
maxthat the mould liquid level value is by the distance that is up to minimum or is changed to maximum one-time continuous by minimum, Δ L
max=| L
max-L
min|
---it is minimum or by the minimum average velocity changed to the highest one-time continuous, V=Δ L by being up to that-velocity of wave motion V is the mould liquid level value
max/ Δ T;
3) according to by the above-mentioned the 2nd) the fluctuating range Δ L of every secondary undulation in step
maxcarry out the size more definite scope grading of fluctuate with the fluctuating range standard value of setting and velocity of wave motion standard value respectively with velocity of wave motion V, obtain every secondary undulation and grade,
----according to property settings fluctuating range standard value and the velocity of wave motion standard value of existing conticaster and the steel grade of producing is respectively 5mm and 1.0mm/s, and fluctuation is graded and is divided into following three and grades and in Table 1:
---the-the first grading 1 is Δ L
max<5mm and V<1.0mm/s,
---the-the second grading 2 is Δ L
max>=5mm and V<1.0mm/s, or Δ L
max<5mm and V>=1.0mm/s,
----tri-gradings 3 are Δ L
max>=5mm and V>=1.0mm/s;
Table 1
4) corresponding each grading weight coefficient W, the selected the above-mentioned the 3rd are set in each grading that is the fluctuation grading according to the characteristic of existing conticaster) the corresponding every secondary undulation grading weight coefficient W of every secondary undulation grading that obtains in step
i, fluctuation grading and each grading weight coefficient are in Table 2:
Table 2
| The fluctuation grading | Weight coefficient W |
| 1 | 0 |
| 2 | 0.01 |
| 3 | 0.15 |
5) by every secondary undulation grading weight coefficient W
iadd and obtain the slag index Q of this continuous casting billet,
n is the 2nd) this continuous casting billet of statistics occurs in step fluctuation number of times, by the slag standard of index value of slag index Q and setting relatively, the present embodiment is 0.3 according to the property settings slag standard of index value of produced steel grade, judges that this surface quality of continuously cast slab and handling suggestion are following and in Table 3:
----when the slag index is less than or equal to 0.3, judge that this continuous casting billet is qualified to show without slag output forecast, and this continuous casting billet is normally sent to roll line,
----when the slag index is greater than 0.3, judging that this continuous casting billet is defective has slag output forecast to show, this continuous casting billet is cleared up.
Table 3
| The slag index | Surface quality of continuously cast slab is judged | Disposal options |
| Q≤0.3 | Qualified in slag | The normal roll line that sends |
| Q>0.3 | Defective have a slag | Send the cleaning line |
6) repeat above-mentioned steps, complete the forecast to every continuous casting billet surface slag inclusion.
Embodiment bis-
The method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling of the present embodiment and embodiment mono-are basic identical, except difference identical with embodiment mono-is:
1, the 1st) in step, the sampling period is 100 milliseconds;
2, the 3rd) in step, the fluctuating range standard value of setting has two, respectively the first fluctuating range standard value 5mm and the second fluctuating range standard value 10mm, the velocity of wave motion standard value of setting has two, be respectively the first fluctuation velocity standard value 1.0mm/s and the second fluctuation velocity standard value 1.5mm/s, the fluctuation grading is divided into following six gradings and in Table 4:
---the-the first grading 1 is Δ L
max<5mm and V<1.0mm/s,
---the-the second grading 2 is 5mm≤Δ L
max≤ 10mm, V<1.0mm/s, or Δ L simultaneously
maxbe less than 5mm, while 1.0mm/s≤V≤1.5mm/s,
----tri-gradings 3 are Δ L
max10mm and V<1.0mm/s, or Δ L
m<5mm and V>1.5mm/s,
----tetra-gradings 4 are 5mm≤Δ L
max≤ 10mm, while 1.0mm/s≤V≤1.5mm/s,
----five gradings 5 are 5mm≤Δ L
max≤ 10mm, V simultaneously>1.5mm/s, or Δ L
max10mm, while 1.0mm/s≤V≤1.5mm/s,
----six gradings 6 are Δ L
max10mm and V>1.5mm/s;
Table 4
3, the 4th) in step, fluctuation grading and each grading weight coefficient are in Table 5:
Table 5
| The fluctuation grading | Weight coefficient W |
| 1 | 0 |
| 2 | 0.01 |
| 3 | 0.05 |
| 4 | 0.15 |
| 5 | 0.3 |
| 6 | 0.7 |
4, the 5th) in step, according to the property settings slag standard of index value of produced steel grade, there are two, be respectively first volume slagging index standard value 0.3 and volume Two slagging index standard value 0.8, judge that this surface quality of continuously cast slab and handling suggestion are following and in Table 6:
----when Q≤0.3, judge that the qualified and output forecast of this continuous casting billet shows, this continuous casting billet is normally sent to roll line,
----when 0.3<Q≤0.8, judging that this continuous casting billet is defective has a small amount of slag output forecast to show, and this continuous casting billet is carried out to part and clear up,
----as Q > 0.8 the time, judging that this continuous casting billet is defective has a large amount of slags output forecast to show, this continuous casting billet is made an overall screening.
Table 6
| The slag index | Surface quality of continuously cast slab is judged | Disposal options |
| Q≤0.3 | Qualified in slag | The normal roll line that sends |
| 0.3＜Q≤0.8 | Defective have a small amount of slag | Local cleaning |
| Q>0.8 | Defective have a large amount of slags | Make an overall screening |
Embodiment tri-
The method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling of the present embodiment and embodiment mono-are basic identical, except difference identical with embodiment mono-is:
1, the 1st) in step, the sampling period is 200 milliseconds;
2, the 3rd) in step, the fluctuating range standard value of setting has two, is respectively the first fluctuating range standard value 4mm and the second fluctuating range standard value 8mm, and the velocity of wave motion standard value of setting is 1.2mm/s, and the fluctuation grading is divided into following five gradings and in Table 7:,
---the-the first grading 1 is Δ L
max<4mm and V≤1.2mm/s,
---the-the second grading 2 is 4mm≤Δ L
max≤ 8mm, while V≤1.2mm/s,
----tri-gradings 3 are Δ L
max8mm and V≤1.2mm/s, or Δ L
m<4mm and V>1.2mm/s,
----tetra-gradings 4 are 4mm≤Δ L
max≤ 8mm, V simultaneously>1.2mm/s,
----five gradings 5 are Δ L
max8mm and V>1.2mm/s,
Table 7
3,, the 4th) in step, fluctuation grading and each grading weight coefficient are in Table 8:
Table 8
| The fluctuation grading | Weight coefficient W |
| 1 | 0 |
| 2 | 0.01 |
| 3 | 0.05 |
| 4 | 0.25 |
| 5 | 0.5 |
4, the 5th) in step, the slag standard of index value of setting has two, is respectively first volume slagging index standard value 0.2 and volume Two slagging index standard value 0.6, judges that this surface quality of continuously cast slab and handling suggestion are following and in Table 9:
----when Q≤0.2, judge that the qualified and output forecast of this continuous casting billet shows, this continuous casting billet is normally sent to roll line,
----when 0.2<Q≤0.6, judging that this continuous casting billet is defective has a small amount of slag output forecast to show, and this continuous casting billet is carried out to part and clear up,
----as Q > 0.6 the time, judging that this continuous casting billet is defective has a large amount of slags output forecast to show, this continuous casting billet is made an overall screening.
Table 9
| The slag index | Surface quality of continuously cast slab is judged | Disposal options |
| Q≤0.2 | Qualified in slag | The normal roll line that sends |
| 0.2＜Q≤0.6 | Defective have a small amount of slag | Local cleaning |
| Q>0.6 | Defective have a large amount of slags | Make an overall screening |
The described concrete technical scheme of above-described embodiment that is not limited to of the present invention, such as: the quantity of fluctuating range standard value, velocity of wave motion standard value, weight coefficient W and the slag standard of index value of 1) setting can be also three more, its numerical value also can be got other numerical value; 2) technical characterictic of the various embodiments described above can constitute new technical scheme mutually; Etc..All employings are equal to the technical scheme of replacing formation and are the protection domain that the present invention requires.
Claims (8)
1. a method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling is characterized in that: comprise the following steps:
1) by existing continuous casting billet production automation system, to set the sampling period Real-time Collection and to store the mould liquid level value of continuous casting in the cycle and the cast length of corresponding mould liquid level value;
2) according to the cast length of producing continuous casting billet, transfer the mould liquid level value to this continuous casting billet that should cast length, calculate the poor of adjacent crystallizer level value, judge according to the positive and negative variation of the difference of adjacent crystallizer level value whether this continuous casting billet liquid level when the crystallizer intercrystalline fluctuates and the statistical fluctuations number of times, the fluctuating range of calculating this secondary undulation according to mould liquid level maximal value and the minimum value of once fluctuation, mould liquid level maximal value and minimum value and the velocity of wave motion of being calculated this secondary undulation by the duration between the mould liquid level peak to peak according to once fluctuation, repeat above-mentioned fluctuating range and the velocity of wave motion that calculates every secondary undulation,
----described fluctuating range is the mould liquid level value by the distance that is up to minimum or is changed to maximum one-time continuous by minimum,
It is minimum or by the minimum average velocity changed to the highest one-time continuous by being up to that----described velocity of wave motion is the mould liquid level value,
3) according to by the above-mentioned the 2nd) fluctuating range of every secondary undulation and velocity of wave motion are carried out the size more definite scope grading of fluctuate with the fluctuating range standard value of setting and velocity of wave motion standard value respectively in step, and obtain every secondary undulation and grade,
----described fluctuating range standard value and velocity of wave motion standard value are at least respectively one according to the property settings of existing conticaster and production steel grade, and described fluctuation grading is divided at least three gradings,
4) corresponding each grading weight coefficient, the selected the above-mentioned the 3rd are set in each grading that is described fluctuation grading according to the characteristic of existing conticaster) the corresponding every secondary undulation grading weight coefficient of every secondary undulation grading that obtains in step;
5) every secondary undulation grading weight coefficient is added and obtains the slag index of this continuous casting billet, by the slag standard of index value of slag index and setting relatively, judge that whether this continuous casting billet is qualified and have or not slag and the output forecast shows, this continuous casting billet is normally sent to roll line or cleared up
----described slag standard of index value is at least one according to the property settings of producing steel grade;
6) repeat above-mentioned steps, complete the forecast to every continuous casting billet surface slag inclusion.
2. method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling according to claim 1, is characterized in that: the described the 3rd) in step, described fluctuating range standard value and velocity of wave motion standard value are respectively one, described fluctuation grading is divided into three gradings,
---the-the first grading is that described fluctuating range is less than the fluctuating range standard value and described velocity of wave motion is less than the velocity of wave motion standard value,
---the-the second grading is that described fluctuating range is more than or equal to the fluctuating range standard value and described velocity of wave motion is less than the velocity of wave motion standard value, or described fluctuating range is less than the fluctuating range standard value and described velocity of wave motion is more than or equal to the velocity of wave motion standard value,
----tri-gradings are that described fluctuating range is more than or equal to the fluctuating range standard value and described velocity of wave motion is more than or equal to the velocity of wave motion standard value;
The described the 5th) in step, described slag standard of index value is one,
----when described slag index is less than or equal to slag standard of index value, judge that this continuous casting billet is qualified to show without slag output forecast, and this continuous casting billet is normally sent to roll line,
----when described slag index is greater than slag standard of index value, judge that this continuous casting billet is defective and export the forecast demonstration, and this continuous casting billet is cleared up.
3. method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling according to claim 1, it is characterized in that: the described the 3rd) in step, described fluctuating range standard value and velocity of wave motion standard value have respectively two, two fluctuating range standard values are respectively the first fluctuating range standard value and the second fluctuating range standard value, two velocity of wave motion standard values are respectively the first fluctuation velocity standard value and the second fluctuation velocity standard value, described fluctuation grading is divided into six gradings
---the-the first grading is that described fluctuating range is less than the first fluctuating range standard value and described velocity of wave motion is less than the first fluctuation velocity standard value,
---the-the second grading is that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, described velocity of wave motion is less than the first fluctuation velocity standard value simultaneously, perhaps described fluctuating range is less than the first fluctuating range standard value, described velocity of wave motion is more than or equal to the first fluctuation velocity standard value and is less than or equal to the second fluctuation velocity standard value simultaneously
----tri-gradings are that described fluctuating range is greater than the second fluctuating range standard value and described velocity of wave motion is less than the first fluctuation velocity standard value, perhaps described fluctuating range is less than the first fluctuating range standard value and described velocity of wave motion is greater than the second fluctuation velocity standard value
----tetra-gradings are that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, and described velocity of wave motion is more than or equal to the first fluctuation velocity standard value and is less than or equal to the second fluctuation velocity standard value simultaneously,
----five gradings are that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, described velocity of wave motion is greater than the second fluctuation velocity standard value simultaneously, perhaps described fluctuating range is greater than the second fluctuating range standard value, described velocity of wave motion is more than or equal to the first fluctuation velocity standard value and is less than or equal to the second fluctuation velocity standard value simultaneously
----six gradings are that described fluctuating range is greater than the second fluctuating range standard value and described velocity of wave motion is greater than the second fluctuation velocity standard value;
The described the 5th) in step, described slag standard of index value has two, is respectively first volume slagging index standard value and volume Two slagging index standard value,
----when described slag index is less than or equal to first volume slagging index standard value, judge that this continuous casting billet is qualified to show without slag output forecast, and this continuous casting billet is normally sent to roll line,
----when described slag index is greater than first volume slagging index standard value and be less than or equal to volume Two slagging index standard value, judging that this continuous casting billet is defective has a small amount of slag output forecast to show, and this continuous casting billet is carried out to part and clear up,
----when described slag index is greater than volume Two slagging index standard value, judging that this continuous casting billet is defective has a large amount of slags output forecast to show, this continuous casting billet is made an overall screening.
4. method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling according to claim 1, it is characterized in that: the described the 3rd) in step, described fluctuating range standard value has respectively two, respectively the first fluctuating range standard value and the second fluctuating range standard value, described velocity of wave motion standard value is one, described fluctuation grading is divided into five gradings
---the-the first grading is that described fluctuating range is less than the first fluctuating range standard value and described velocity of wave motion is less than or equal to the velocity of wave motion standard value,
---the-the second grading is that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, and described velocity of wave motion is less than or equal to the velocity of wave motion standard value simultaneously,
----tri-gradings are that described fluctuating range is greater than the second fluctuating range standard value and described velocity of wave motion is less than or equal to the velocity of wave motion standard value, or described fluctuating range is less than the first fluctuating range standard value and described velocity of wave motion is greater than the velocity of wave motion standard value,
----tetra-gradings are that described fluctuating range is more than or equal to the first fluctuating range standard value and is less than or equal to the second fluctuating range standard value, and described velocity of wave motion is greater than the velocity of wave motion standard value simultaneously,
----five gradings are that described fluctuating range is greater than the second fluctuating range standard value and described velocity of wave motion is greater than the velocity of wave motion standard value,
The described the 5th) in step, described slag standard of index value has two, is respectively first volume slagging index standard value and volume Two slagging index standard value,
----when described slag index is less than or equal to first volume slagging index standard value, judge that this continuous casting billet is qualified to show without slag output forecast, and this continuous casting billet is normally sent to roll line,
----when described slag index is greater than first volume slagging index standard value and be less than or equal to volume Two slagging index standard value, judging that this continuous casting billet is defective has a small amount of slag output forecast to show, and this continuous casting billet is carried out to part and clear up,
----when described slag index is greater than volume Two slagging index standard value, judging that this continuous casting billet is defective has a large amount of slags output forecast to show, this continuous casting billet is made an overall screening.
5. method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling according to claim 2, it is characterized in that: described fluctuating range standard value is 5mm, described velocity of wave motion standard value is 1.0mm/s, and described slag standard of index value is 0.3, and described each grading weight coefficient is respectively 0,0.01 and 0.15.
6. method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling according to claim 3, it is characterized in that: described the first fluctuating range standard value is 5mm, described the second fluctuating range standard value is 10mm; Described the first fluctuation velocity standard value is 1.0mm/s, described the second fluctuation velocity standard value is 1.5mm/s, described first volume slagging index standard value is 0.3, and described volume Two slagging index standard value is 0.8, and described each grading weight coefficient is respectively 0,0.01,0.05,0.15,0.3 and 0.7.
7. method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling according to claim 4, it is characterized in that: described the first fluctuating range standard value is 4mm, described the second fluctuating range standard value is 8mm; Described velocity of wave motion standard value is 1.2mm/s, and described first volume slagging index standard value is 0.2, and described volume Two slagging index standard value is 0.6, and described each grading weight coefficient is respectively 0,0.01,0.05,0.25,0.5.
8. according to the arbitrary described method for forecasting slag inclusion situations of surfaces of continuous casting slabs before rolling of claim 1-7, it is characterized in that: the described sampling period is the 30-250 millisecond.
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| CN105945252A (en) * | 2016-06-20 | 2016-09-21 | 首钢总公司 | Method for controlling fluctuation of liquid level of crystallizer |
| CN110586891A (en) * | 2019-09-30 | 2019-12-20 | 河钢股份有限公司 | Method for evaluating liquid level control precision of continuous casting crystallizer |
| CN113926865B (en) * | 2020-06-29 | 2024-03-08 | 宝山钢铁股份有限公司 | Casting blank slag inclusion prediction method, machine cleaning control method, computing equipment and storage medium |
| CN111679625B (en) * | 2020-06-29 | 2021-10-29 | 马鞍山钢铁股份有限公司 | Method for evaluating liquid level fluctuation of multi-dimensional continuous casting machine crystallizer quickly and accurately |
| CN112077273B (en) * | 2020-09-18 | 2022-03-01 | 马鞍山钢铁股份有限公司 | Plate blank quality judgment and evaluation system and method with variable pulling speed |
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