CN100507770C - Method for determining the time of hot rolling heating stove bar plate leavings in furnace - Google Patents
Method for determining the time of hot rolling heating stove bar plate leavings in furnace Download PDFInfo
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- CN100507770C CN100507770C CNB2006100270913A CN200610027091A CN100507770C CN 100507770 C CN100507770 C CN 100507770C CN B2006100270913 A CNB2006100270913 A CN B2006100270913A CN 200610027091 A CN200610027091 A CN 200610027091A CN 100507770 C CN100507770 C CN 100507770C
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Abstract
The invention discloses an affirming method of residual time of hot-rolled heater slab in the furnace, which comprises the following steps: calculating extracting interval of slab in the furnace through combined prediction model of slab extracting interval according to the length, product breadth and product thickness of slab in the furnace and the length, product breadth, thickness and hardness grade of slab; fusing the extracting time with present timely extracting time; indexing from extracting end according to the present position of each segment length of heater and slab and the length from slab to end; accumulating the extracting interval of slab within index scale to calculate; affirming the residual time of slab in the furnace or segment; fitting automatically; repairing the residual time to predict the temperature of slab precisely. The invention can control the temperature of heater precisely to make the slab reach the regulated goal temperature, which is benefit to improve the temperature control level of slab in the heater and heating quality of slab with low energy consumption.
Description
Technical field
The present invention relates to the processing and forming of hot-rolled steel, more specifically be meant a kind of definite method of slab of hot rolling heating furnace residue time inside furnace.
Background technology
Two main targets of hot-rolling heating furnace production have two, and one is to provide the slab that satisfies the heating furnace quality requirements for later process; Another target is harmonious with rolling line, satisfies the requirement of rolling line rolling rhythm.The target of back is the best definite problem of extracting rhythm out of furnace plate blank, and the target of front is a slab heating temperature control problem.These two targets connect each other, and key variables in the control of slab heating temperature are exactly the residue time inside furnace of slab in heating furnace, the automatic combustion controlling models utilizes the residue time inside furnace of slab to calculate, and determine the furnace gas temperature setting value; And the residue time inside furnace is to determine according to suitable extraction rhythm.
Determine that heating furnace takes out steel rhythm dual mode is generally arranged, the one, according to automatic rhythm control (MPC) mode of foundation mathematical model, another kind is the mode of regularly taking out steel rhythm.Determine that with this dual mode furnace plate blank residue time inside furnace all has certain problem:
The MPC mode is difficult to calculate accurately, even it is unstable sometimes, reason is that a lot of uncertain factors are arranged, make and only also can't determine rolling rhythm accurately at present with mathematical model, so the MPC mode can only be used for the monitoring of rolling rhythm, be difficult to constitute closed-loop control, that is to say that the residue time inside furnace of slab in the heating furnace is difficult to determine according to the result of calculation that MPC provides with heating furnace.
The timing of regularly taking out the steel mode is at interval generally by the operation interface input, and Heating Furnace Control determines the extraction moment of next piece slab according to this time, and calculates the residue time inside furnace of slab in the stove.If all slabs in the heating furnace all are same sizes, rolling rhythm is about the same, so regularly taking out steel does not change at interval, the calculating of the residue time inside furnace of slab is relatively accurate, regrettably, length, finish to gauge target thickness and finish to gauge target width and the hardness group of a rolling scaduled middle slab all will change, these slabs rhythm when reality is rolling will change, heating furnace is in order to adapt to this variation, operating personnel will intervene the setting of furnace gas temperature in advance, and take out steel rhythm actual the modification on operation interface when taking out steel.Because the residue time inside furnace of slab is according to the current steel rhythm of taking out in the heating furnace, according to rolling order accumulation calculating, when taking out steel rhythm and change, the residue time inside furnace must change, make that the actual time inside furnace of slab is inaccurate, make that also the setting of furnace gas temperature is inaccurate.
So at present the method for using all has problems, can accurately not calculate furnace plate blank excess time, thereby can't well adapt to hot rolling production, must seek a kind of new definite furnace plate blank and remain in the stove time method,, satisfy the demand that hot rolling is produced to address the above problem.
Summary of the invention
The object of the present invention is to provide a kind of definite method of slab of hot rolling heating furnace residue time inside furnace, determine the deficiency of method to overcome tradition, thereby better the temperature of slab is forecast accurately, exactly control set heating furnace furnace gas temperature so that slab reaches the process goal temperature of regulation, the heating quality that the temperature controlled water that helps improving slab in the heating furnace is flat, improve slab and reduce energy resource consumption.
To achieve these goals, the present invention has adopted following technical scheme:
Definite method of this slab of hot rolling heating furnace residue time inside furnace may further comprise the steps:
A. at first according to length scale, finished width grade, finished product thickness grade and the hardness level of length, finished width and finished product thickness and the slab of slab in the heating furnace, utilize slab to extract out and make up forecasting model at interval, and extract the interval out with current timing and merge, determine the extraction interval of slab in the heating furnace;
B. again according to the current location of each section of heating furnace segment length and slab,, the slab in the index range is extracted out is at interval carried out accumulation calculating from extracting a section beginning index out according to the length at slab distance segment end, determine slab remain in stove or in the section time;
C. to whether having the slab extraction to judge,, then finish the time of slab,, then carry out the step of next step D if there is slab to extract out in stove or section if there is not slab to extract out;
D. calculate the actual extraction rhythm of current slab, and extract out at interval with the slab of built-up pattern forecast and to compare, and adapt to correction automatically according to result relatively.
Described steps A further may further comprise the steps:
A1. obtain the compacting planning data of slab;
A2. call built-up pattern and determine the output gap of slab;
A3. obtain the timing of operating personnel's input and extract rhythm out;
A3. carry out the extraction interval of slab in the combination calculation heating furnace, and preserve result of calculation.
Described step B further may further comprise the steps:
B1. obtain the position of designated plate blank in heating furnace;
B2. calculate the length at this slab distance segment end;
B3. from extracting all slabs of section beginning index respective length correspondence out;
B4. determine the residue time inside furnace of current pre-extraction slab;
B5. the residue time inside furnace total or each section of slab after determining second.
Described step D further may further comprise the steps:
D1. obtain the extraction moment of last block of slab;
D2. obtain the extraction moment of current block slab;
D3. calculate the actual rhythm of extracting out;
D4. the extraction rhythm of last block of slab is revised and saving result.
In technique scheme of the present invention, this method is at first according to length scale, finished width grade, finished product thickness grade and the hardness level of length, finished width and finished product thickness and the slab of slab in the heating furnace, utilize slab extraction interval to make up the extraction interval that forecasting model calculates slab in the heating furnace, and merge at interval with current timing extraction.Again according to the current location of each section of heating furnace segment length and slab,, the slab in the index range is extracted out is at interval carried out accumulation calculating from extracting a section beginning index out according to the length at slab distance segment end, determine slab remain in stove or in the section time.The slab extraction of calculating the forecast of current actual extraction rhythm and built-up pattern compares at interval, adapts to automatically and revises.Thereby better the temperature of slab is forecast accurately, exactly control set heating furnace furnace gas temperature so that slab reaches the process goal temperature of regulation, the heating quality that the temperature controlled water that helps improving slab in the heating furnace is flat, improve slab and reduce energy resource consumption.
Description of drawings
Fig. 1 determines the method flow synoptic diagram for slab of hot rolling heating furnace residue time inside furnace of the present invention.
Fig. 2 is the schematic flow sheet that slab of hot rolling heating furnace of the present invention is extracted rhythm out.
Fig. 3 remains in the schematic flow sheet of stove time for slab in the heating furnace of the present invention.
Fig. 4 is that slab of the present invention is extracted rhythm correction schematic flow sheet out.
Fig. 5 presses apart from the index principle schematic for calculating the bar plate leavings time inside furnace.
Embodiment
In order to understand technique scheme of the present invention better, describe in detail further below in conjunction with drawings and Examples.
See also shown in Figure 1ly, slab of hot rolling heating furnace of the present invention residue time inside furnace determines that method may further comprise the steps:
Dimensions data of slab in the rolling scaduled acquisition heating furnace at first, the just length scale of the length of slab, finished width and finished product thickness and slab, finished width grade, finished product thickness grade and hardness level, call the extraction interval that statistical parameter model and form parameter model calculate slab in the heating furnace, the result of calculation addition, take out steel with present timing then and merge mutually at interval.
Determine to extract out the index range of section again according to the position of each segment length of heating furnace and slab, the slab model prediction in the index range is extracted out at interval added up, determine the residue time inside furnace of slab or in the section time from heating furnace.
After if current slab is extracted out, utilize the extraction moment of this slab and the extraction moment of last block of slab, calculate actual extraction at interval, slab length scale, finished width grade, finished product thickness grade and hardness level according to last block of slab, extraction to last block of slab is smoothly learnt at interval, and the corresponding parameter of correction card model.
See also shown in Figure 2ly, slab of hot rolling heating furnace is extracted rhythm out and be may further comprise the steps:
At first according to the length, finished width and the finished product thickness that obtain slab in the heating furnace from rolling scaduled data, utilize the input quantity of these three amounts as parameter model in the built-up pattern, determine the output of this model, and then utilize length scale, finished width grade, finished product thickness grade and the hardness level of this slab, the correction of indexed table model correspondence, these two value combination additions obtain the slab extraction rhythm predicted value that built-up pattern calculates; And then the current slab that the acquisition operative employee imports on operation interface is regularly extracted out at interval, the slab that this is regularly extracted out at interval and built-up pattern calculates is extracted out the rhythm predicted value to be merged by given scale-up factor, acquisition is used to calculate the extraction rhythm of each slab that remains time inside furnace, and the result is preserved.
Furnace plate blank is extracted out and is determined that at interval model comprises the combination of two parts, and the one, utilize real data to return the statistical parameter model that obtains, another part is based on the correction model of classification form.Also can, do not have argument section and have only the model of retouch.
1, parameter model
Input parameter is the length of slab, the finished product thickness of slab and the finished width of slab, and method is as follows:
pitch(l，h，w)＝
(a
1×l+a
2×h+a
3×w+b
1×l
2+b
2×h
2+b
3×w
2+c
1×l×h+c
2×l×w+c
3×w×h)
Wherein: l, h, w is respectively a slab length from according to rolling scaduled acquisition, finished product thickness and finished width; Model parameter a
i, b
i, c
i, i=1,2,3 obtain as follows:
A＝B
-1.C
Matrix A is exactly a model parameter, A=[a
1a
2a
3b
1b
2b
3c
1c
2c
3]
T
Matrix B is according to the slab length of n piece slab from rolling scaduled acquisition, and finished product thickness and finished width data generate, and expression formula is:
Matrix C is the actual extraction interval of n piece slab production, and expression formula is:
C＝[pitch(l
1，h
1，w
1)pitch(l
2，h
2，w
2)…pitch(l
n，h
n，w
n)]
T
2, the form correction model
(w_level is to determine by the method for table index harg_level) to modify, promptly presses length scale, finished product thickness grade, finished width grade and the hardness level index of slab for l_level, h_level.
3, described slab extraction is made up the forecasting model expression formula at interval and is:
Wherein,
The slab that the combining prediction model is determined is extracted out at interval,
Pitch_pre extracts out according to furnace plate blank and determines Model Calculation at interval, that is:
pitch_pre＝
(a
1×l+a
2×h+a
3×w+b
1×l
2+b
2×h
2+b
3×w
2+c
1×l×h+c
2×l×w+c
3×w×h)
+modify(l_level，h_level，w_level)
Pitch_now is the timing rhythm of present operative employee's input;
β ∈ [0,1] is a fusion coefficients.
See also Fig. 3, shown in Figure 5, determine that the residue time inside furnace of each slab in the heating furnace may further comprise the steps:
At first read the position data of slab in heating furnace, and determine the distance of slab apart from each section section end according to each section of heating furnace segment length data, extract the section beginning out from heating furnace and carry out index according to the identical length of the segment length of previous calculations, determine all slabs in this distance range in proper order by extraction, the residue time inside furnace of current pre-extraction slab adopts regularly takes out steel at interval, and according to last block of slab take out steel constantly and the current moment calculate the residue time inside furnace of current pre-extraction slab, extract the residue time inside furnace or the section of the remaining in time of slab after suitable second out, length with slab, finished width and finished product thickness are input parameter, utilize the parameter model in the built-up pattern to calculate, result of calculation with the length scale of slab, the correction that finished width grade and finished product thickness grade obtain from the correction card model as index, that determines each slab in the index distance range takes out steel rhythm, carry out accumulation calculating at last, just obtained the residue time inside furnace or the section residue time inside furnace of slab.
The furnace plate blank of determining according to slab rolling order in the heating furnace and model prediction extract out at interval and each slab position and extraction in proper order, calculate every block of slab remain in stove or in the section time.
According to said method of the present invention, for the situation that a concrete heating furnace is produced slab, the time deterministic process that remains in heating furnace or the section of its slab is as follows:
What 1, next piece was extracted slab out remains in the stove Time Calculation
Extract the extraction predetermined instant that calculates when handling out with last extraction slab, calculate next piece and extract the residue time inside furnace of material when extracting out out.
ΔT
F＝T
PRE-T
NOW
Δ T
F: extract excess time (sec) out
T
PRE: according to the extraction predetermined instant of timing tempo calculation
T
NOW: current time
2, total stove time prediction that remains in is calculated
Next piece is extracted out material:
ST
1，1＝ΔT
F/3600
Δ T
F: remain find time (sec)
ST
1,1: next piece is extracted material prediction time inside furnace (hr) out
In the extraction order, second block of later slab, the calculating of total residue time inside furnace:
ST
1，i＝(ΔT
F+ΔT
PRE)/3600
Wherein, ST
1, iIt is i piece slab prediction residue time inside furnace (hr);
I: extract serial number out.
3, the calculating of each section residue time inside furnace
Determine that each slab is to each section section end residue section hold-up time in the heating-furnace; Be divided into two steps, the one, the corresponding extraction order slab retrieval of last distance from current slab to section, the 2nd, determine the residue time inside furnace of slab according to the result who retrieves at each section.
(1) distance corresponding extraction in end is retrieved along slab from current slab to section
To extract section out is benchmark, and when the current existence section of a certain slab was k, this each section of slab residue length was:
L
k＝X
k-X
k(k+1)
L
k+1＝X
k(k+1)-X
(k+1)(k+2)
L
k: each section residue length (m)
X
k: slab current location (m)
X
K (k+1): the crossover location of k section and k+1 section (position, k section section end).
K: the current place of slab section; Suppose K=3,4,5.
From the slab that current location is drawn out of during displacement, get its last extraction of extracting slab out along number being M till section section end, place
1, this slab leaves the position distance of coming out of the stove and is L
k(m).From section section end, current place to following a section last displacement (L
kTo L
K+1) in extract slab out and extract out along number being M
1To M
2So, current slab is by i when section (comprising current place section), is drawn out of slab and extracts out along number from M
1To M
i
(2) each section prediction remains in the stove Time Calculation
Retrieve with above-mentioned that to extract serial number out be M
1～M
iThe residue time inside furnace of slab calculates each section residue time inside furnace.
ZT
k: each band prediction residue time inside furnace (hr).
I: extract serial number out.
See also bar plate leavings time inside furnace shown in Figure 5 principle schematic by the distance indexing means, 1 is heating furnace, M
1Be current slab, L
3Be the distance of current slab to the section end, M
3Be current slab and extracting the result of section out by the distance index.
See also shown in Figure 4ly, determine that slab extracts the rhythm correction out and may further comprise the steps:
At first according to the extraction moment of last block of slab and the extraction moment of current firm extraction slab, calculate actual extraction rhythm, with the length of utilizing according to last block of slab, the length scale of finished width and finished product thickness and slab, the finished width grade, finished product thickness grade and hardness level are extracted out at interval for the slab of the built-up pattern forecast of input, compare, relatively result with the length scale of this slab, the finished width grade, finished product thickness grade and hardness level are that the form correction that index obtains is smoothly learnt, and study a result be saved in the corresponding index position of form model, upgrade original form modified value.
Current slab compares the coefficient of the other form of piece slab place layer before revising according to coming out of the stove at interval of it and preceding piece slab by the rhythm with the preceding piece slab of Model Calculation after coming out of the stove.
modify_new＝modify_old+η×(act_pit-model_pitch)
Modify_old is preceding piece slab, and (w_level hard_level) presses the coefficient of length scale, finished product thickness grade and the finished width hierarchy index of slab for l_level, h_level by form model modify.
Act_pit is that actual slab is extracted rhythm out.
Model_pitch is the data that provide according to rolling scaduled, presses that built-up pattern determines, that is:
model_pitch＝
(a
1×l+a
2×h+a
3×w+b
1×l
2+b
2×h
2+b
3×w
2+c
1×l×h+c
2×l×w+c
3×w×h)
+modify(l_level，h_level，w_level，hard_level)
Wherein: l, h, w is respectively slab length, finished product thickness and finished width from according to rolling scaduled acquisition.
η is a smoothing factor, η ∈ [0,1]; Modify_new is revised learning coefficient, is kept in the form model, adopts when forecasting the residue time inside furnace of slab next time.
Be example with hot rolling stepping beam type four-part form heating furnace more below, how illustrate as follows stove bar plate leavings time inside furnace deterministic process according to the described step of method of the present invention:
Hot rolling stepping beam type four-part form heating furnace, soaking zone segment length 8300mm, the second bringing-up section segment length 7000mm, the first bringing-up section segment length 7000mm, preheating section segment length 11200mm, heating furnace process machine burning control cycle adopted 1 minute, the finished product slab thick gauge lattice that heating furnace is produced are from 1.1mm to 20mm, the finished width specification is from 700mm to 1730mm, slab length is divided into short base and long base, and short base specification is from 4500mm to 5500mm, and long base specification is from 8000mm to 11000mm, the slab length scale, finished width and finished product thickness grade separation are as follows, corresponding 4 the width grades of length scale and 24 level of thickness.
Concrete parameter please see the following form:
The current residue time inside furnace of waiting to extract out slab is the moment of extracting out according to last block of slab and the present moment in the heating furnace, calculate according to present fixed time interval, second block of later slab adopts the length of slab, finished width and finished product thickness are as the input of the parameter model of built-up pattern, the length scale of result of calculation and this slab correspondence of employing, width grade and level of thickness are as the form model correction factor addition of input index, taking out steel with current timing then merges at interval, fusion coefficients β is relevant with the specification jump of specifying calculating slab and last block of extraction slab, promptly as (0.5 * a
1+ 0.5 * a
2+ 0.2 * a
3)＜=0.4 o'clock, β=0.8 is as (0.5 * a
1+ 0.5 * a
2+ 0.2 * a
3) 0.4 o'clock, β=0.2; A wherein
1, a
2, a
3For calculating slab and the last absolute value of extracting slab slab length scale, finished width grade and the jump of finished product thickness grade out; The slab that calculates according to built-up pattern is extracted out at interval again, according to the physical location of each slab and given segment length, determine the distance at the slab section of arriving end, be mapped to and extract section out, slab in the mapping scope extracted out carries out accumulation calculating at interval, obtain slab remain in stove or in the section time; After first block of slab of current extraction section extracted out, calculate actual extraction at interval, and and the result of calculation of built-up pattern compare, form model coefficient to last block of slab is smoothly revised, smoothing factor η=0.05, new modified value is saved in the form according to length scale, finished width grade and the finished product thickness grade of slab, is used for next computation period, and the slab of forecast same size is extracted out at interval.According to method of the present invention, calculate slab remain in stove or in the section time, the furnace gas temperature that is used for furnace plate blank heating process is dynamically set control.
By foregoing description as seen, the present invention can utilize the situation of change of built-up pattern according to the slab specification, the extraction of slab at interval in the forecast heating furnace, calculate exactly slab in the heating furnace remain in stove or in the section time, overcome in heating furnace because slab length, the difference of finished width and finished product thickness causes remains in the inaccurate deficiency of stove Time Calculation, thereby better the temperature of slab is forecast accurately, exactly control set heating furnace furnace gas temperature so that slab reaches the process goal temperature of regulation, the temperature controlled water that helps improving slab in the heating furnace is flat, improve the heating quality of slab and reduce energy resource consumption.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (4)
1, a kind of definite method of slab of hot rolling heating furnace residue time inside furnace,
It is characterized in that this method may further comprise the steps:
A. at first according to length scale, finished width grade, finished product thickness grade and the hardness level of length, finished width and finished product thickness and the slab of slab in the heating furnace, utilize slab to extract out and make up forecasting model at interval, and extract the interval out with current timing and merge, determine the extraction interval of slab in the heating furnace;
B. again according to the current location of each section of heating furnace segment length and slab,, the slab in the index range is extracted out is at interval carried out accumulation calculating from extracting a section beginning index out according to the length at slab distance segment end, determine slab remain in stove or in the section time;
C. to whether having the slab extraction to judge,, then finish the time of slab,, then carry out the step of next step D if there is slab to extract out in stove or section if there is not slab to extract out;
D. calculate the actual extraction rhythm of current slab, and extract out at interval with the slab of built-up pattern forecast and to compare, and adapt to correction automatically according to result relatively.
2, definite method of slab of hot rolling heating furnace residue time inside furnace as claimed in claim 1,
It is characterized in that,
Described steps A further may further comprise the steps:
A1. obtain the compacting planning data of slab;
A2. call built-up pattern and determine the output gap of slab;
A3. obtain the timing of operative employee's input and extract rhythm out;
A3. carry out the extraction interval of slab in the combination calculation heating furnace, and preserve result of calculation.
3, definite method of slab of hot rolling heating furnace residue time inside furnace as claimed in claim 1,
It is characterized in that,
Described step B further may further comprise the steps:
B1. obtain the position of designated plate blank in heating furnace;
B2. calculate the length at this slab distance segment end;
B3. from extracting all slabs of section beginning index respective length correspondence out;
B4. determine the residue time inside furnace of current pre-extraction slab;
B5. the residue time inside furnace total or each section of slab after determining second.
4, definite method of slab of hot rolling heating furnace residue time inside furnace as claimed in claim 1,
It is characterized in that,
Described step D further may further comprise the steps:
D1. obtain the extraction moment of last block of slab;
D2. obtain the extraction moment of current block slab;
D3. calculate the actual rhythm of extracting out;
D4. the extraction rhythm of last block of slab is revised and saving result.
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|---|---|---|---|
| CNB2006100270913A CN100507770C (en) | 2006-05-30 | 2006-05-30 | Method for determining the time of hot rolling heating stove bar plate leavings in furnace |
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| CNB2006100270913A CN100507770C (en) | 2006-05-30 | 2006-05-30 | Method for determining the time of hot rolling heating stove bar plate leavings in furnace |
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| CN101869915A (en) * | 2009-04-24 | 2010-10-27 | 上海宝信软件股份有限公司 | Method for forecasting temperature of slab of hot rolling heating furnace |
| CN102888505B (en) * | 2011-07-19 | 2014-06-04 | 宝山钢铁股份有限公司 | Control method for detection of slab in heating furnace |
| CN102888506B (en) * | 2011-07-22 | 2013-11-20 | 宝山钢铁股份有限公司 | Method for controlling position of plate blank at extraction end of heating furnace |
| CN103882221B (en) * | 2012-12-24 | 2016-04-13 | 上海梅山钢铁股份有限公司 | The method of the shortest time inside furnace of dynamic prediction slab in hot-rolling heating furnace model |
| CN105396878B (en) * | 2015-12-02 | 2017-05-10 | 张家港浦项不锈钢有限公司 | Steel drawing control method and device for hot rolling production line |
| CN109663815A (en) * | 2018-12-28 | 2019-04-23 | 宝钢湛江钢铁有限公司 | A kind of control method and system for taking out steel automatically during hot rolling |
| CN109976280A (en) * | 2019-04-11 | 2019-07-05 | 北京科技大学设计研究院有限公司 | A kind of method of Exact Forecast hot rolling slab residue time inside furnace |
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| CN113355507B (en) * | 2021-05-14 | 2022-11-08 | 武汉钢铁有限公司 | Method and device for heating steel billet in heating furnace |
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| EP1310573A2 (en) * | 2001-11-13 | 2003-05-14 | Voest-Alpine Industrieanlagenbau GmbH & Co. | Process to produce a metal melt on the basis of a dynamic process model, including a correction model |
| CN1473945A (en) * | 2003-07-15 | 2004-02-11 | 上海应用技术学院 | Locally reinforced heating method and device for hot rolling steel billet before discharging |
| WO2005099923A1 (en) * | 2004-04-06 | 2005-10-27 | Siemens Aktiengesellschaft | Method for producing a metal |
| JP2005320563A (en) * | 2004-05-06 | 2005-11-17 | Sumitomo Metal Ind Ltd | Method for controlling temperature of molten steel |
| CN1704487A (en) * | 2004-05-28 | 2005-12-07 | 上海宝信软件股份有限公司 | Process for controlling temperature of strip steel |
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