CN1840263A - Process for automatically controlling shrinkage filling for electroslag remelting refining operation - Google Patents
Process for automatically controlling shrinkage filling for electroslag remelting refining operation Download PDFInfo
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- CN1840263A CN1840263A CN 200510024668 CN200510024668A CN1840263A CN 1840263 A CN1840263 A CN 1840263A CN 200510024668 CN200510024668 CN 200510024668 CN 200510024668 A CN200510024668 A CN 200510024668A CN 1840263 A CN1840263 A CN 1840263A
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- feeding
- molten
- electroslag
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Abstract
The invention discloses an electroslag furnace smelting craft, which is characterized by the following: the controlling of feeding processing parameter is according to two formulas to built control curve: lnfV smelt lnI2RT-lnfV smelt 2lnI+lnR+lnT,I=KT+B; The truncate operation is finished according to control curve.
Description
Technical field: the present invention relates to a kind of electroslag furnace smelting process, particularly a kind of process for automatically controlling shrinkage filling for electroslag remelting refining operation.
Background technology: the electroslag remelting refining later stage must be carried out the feeding operation, could reduce the shrinkage cavity defect degree of depth at electroslag ingot top like this, improves the availability of steel ingot.Traditional feeding operating procedure has two kinds, and a kind of is manually, forfeits the method for electricity between employing and carries out.Another kind is that the method that reduces input power is continuously carried out the feeding operation.These two kinds of methods are to rely on operative employee's experience to carry out fully, so the randomness of the top shrinkage cavity defect of electroslag ingot is bigger, the top differences in appearance that different operating personnel smelt the steel ingot that is also bigger.The present invention is exactly at above situation, realizes control feeding operation by setting up the control curve model, reaches and improves the feeding effect, improves the purpose of electroslag ingot lumber recovery.
Summary of the invention: the purpose of this invention is to provide a kind of electroslag furnace feeding and control technology automatically, solve the technical problem that present feeding can't quantitatively be controlled.By feeding smelting process operation, control speed of melting and time, make that in the regular hour volume in hole that the top produces when the molten steel volume of institute's melting equals molten steel solidification and becomes steel ingot is to reduce shrinkage cavity defect, the availability of raising steel ingot.
By electric slag refusion and smelting as can be known: the input power in the burn-off rate of consutrode and the molten slag bath becomes a corresponding relation of determining.Usually the computing formula that adopts during design is:
V
Molten=(0.7 ~ 0.8) D
Knot(1)
V
Molten: comsumable melt speed, unit is Kg/h;
D
Knot: crystallizer nominal diameter, unit are mm;
Following formula is applicable to d
/ D
Knot=0.6 ± 0.05 condition.
V during normal the smelting
MoltenBe a constant, and in the feeding phase, require in the regular hour that consumbuble-electrode melting changes into the volume that the volume of molten steel equals to shrink when the feeding phase, molten steel solidification became steel ingot and equates.The requirement of feeding is: the steel ingot top is plentiful, and the top shrinkage cavity defect degree of depth requires minimum or eliminates shrinkage cavity defect.In the feeding process, this is a process of progressively finishing, and is relevant with factors such as the input power of electric energy in the temperature in the specification of steel ingot, molten bath, the molten bath and intensities of cooling.Under the situation that other conditions are determined, V
MoltenAs follows with the power corresponding relation formula of electric energy input in the molten bath:
F (V
Molten) ∝ U
2T/R=I
2RT (2)
F (V
Molten): the molten steel (kg) of feeding phase institute's melting;
∝: f (V
Molten) with the molten bath in the corresponding relation of input work.
U: input voltage (V);
R: the composition of the resistance of molten slag bath (Ω) the molten bath quantity of slag and slag is determined the back, and it is a constant;
T: feeding smelting time (min):
I: input current (A);
When adopting computer to control automatically, because of the technical difficulty of regulation voltage, be easier to relatively and regulate electric current, so generally adopt fixed voltage, the mode of regulating electric current realizes, promptly adopts f (V
Molten) ∝ I
2The RT formula is controlled.Analyze (2) formula as can be known: f (V
Molten) be and I
2With the multiplication relationship of T, and with electric current I be quadratic relationship.Difficult realization the in control.But can carry out conversion to the above-mentioned relation formula, multiplication relationship can be converted into addition relation, i.e. linear relationship by exponential transform.
Lnf (V
Molten) ∝ lnI
2RT → lnf (V
Molten) ∝ 2lnI+lnR+lnT (3).
And electric current and time T can be simplified to linear relation I=KT+B (4).
K is the straight line coefficient in the formula, and B is a constant.
Can get by (3) and (4) and to control curve as shown in drawings, by accompanying drawing as can be known: f (V
Molten) be the functional relation of electric current to time integral.The factor that other are less important is omitted, and only considers several main control parameter (input voltage U, input current I
0, feeding time period T
0, T
1, T
2, T
3With electric current Current Control straight slope K
1, K
2, K
3).Very directly perceived and feasible so feeding control just becomes.
The invention has the beneficial effects as follows: by setting up the feeding control curve of different steel grades, just can come shrinkage filling for electroslag remelting refining operation is quantitatively controlled, avoid the randomness of artificial control, improve feeding effect and electroslag ingot lumber recovery by the control parameter.
Description of drawings:
Accompanying drawing is shrinkage filling for electroslag remelting refining operation control curve map of the present invention
The specific embodiment:
In actual production, the specification of feeding technology control parameter and the steel grade of being smelted, steel ingot, the factors such as slag system that adopted are closely related.The control parameter can be surveyed aborning and be obtained or adopt computing formula to obtain, but these parameters can be because of different steel grades, the steel ingot of different specification size and difference.At the concrete steel grade and the electroslag ingot of specification, in the production of reality, constantly adjust the control parameter, find optimal control curve and decide.So different steel grades, the steel ingot of different specification size must adopt different control curves, could arrive the effect of optimal desired.Set up concrete control curve model by continuous debugging.Just can realize controlling automatically feeding and smelt electroslag ingot.So it is just extremely important to set up the control of feeding shown in accompanying drawing curve model.Can carry out feeding smelting operation control aborning easily by these control curve models.
Embodiment 1, and concrete control curve is given an example: the 9Cr2Mo electroslag steel as Φ 280 specifications is groped through 3 months debugging, and the best feeding control parameter that finds is: voltage U=53V; Electric current I
0=6000A; I
1=I
2=4000A; K
1=500; K
2=0; K
3=400; T1～T2=4min; T2～T3=3min; T3～T4=8min.Adopt this curve to carry out automatic feeding operation, the top shrinkage cavity defect degree of depth of electroslag ingot can be controlled in the 10mm, eliminate top shrinkage cavity defect problem.
Embodiment 2, and as the H13 hot die steel of Φ 420 specifications, this steel grade is compared with 9Cr2Mo, the alloy content height, liquid molten steel surface tension force is big, and the shrinkage factor when solidification of molten steel becomes solid-state is big, and the ingot shape size of electroslag ingot is big more, the just difficult more control of its top shrinkage cavity defect.Debugging through the time more than 1 year is groped, and the best feeding control parameter that finds is: voltage U=62V; Electric current I
0=7800A; I
1=6300A; I
2=4800A; K
1=60; K
2=500; K
3=300; T
1～T
2=25min; T
2～T
3=3min; T
3～T
4=15min.Adopt this curve to carry out automatic feeding operation, the top shrinkage cavity defect degree of depth of electroslag ingot can be controlled in the 30mm, by this control curve time of existing 6 months of production, satisfy the customer requirements of the electroslag ingot top depth of defect of H13 hot die steel Φ 420 specifications, eliminate top shrinkage cavity defect problem substantially less than 50mm.By the enforcement of this technology, can guarantee that substantially the electroslag ingot availability is more than 95%.
Claims (1)
1, a kind of process for automatically controlling shrinkage filling for electroslag remelting refining operation, feeding are to utilize comsumable melt to finish the filling up of shrinkage cavity at electroslag ingot top, it is characterized in that: the feeding technology parameter control is set up control curve: lnfV by following two formula
Molten∝ lnI
2RT → lnfV
Molten∝ 21nI+lnR+lnT, I=KT+B finishes the feeding operation according to the control curve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100246680A CN100421840C (en) | 2005-03-28 | 2005-03-28 | Process for automatically controlling shrinkage filling for electroslag remelting refining operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100246680A CN100421840C (en) | 2005-03-28 | 2005-03-28 | Process for automatically controlling shrinkage filling for electroslag remelting refining operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1840263A true CN1840263A (en) | 2006-10-04 |
| CN100421840C CN100421840C (en) | 2008-10-01 |
Family
ID=37029553
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100246680A Expired - Fee Related CN100421840C (en) | 2005-03-28 | 2005-03-28 | Process for automatically controlling shrinkage filling for electroslag remelting refining operation |
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876901A (en) * | 2012-09-26 | 2013-01-16 | 攀钢集团江油长城特殊钢有限公司 | Feeding process for vacuum self-consuming smelting of titanium or titanium alloy |
| CN102978413A (en) * | 2012-12-14 | 2013-03-20 | 烟台台海玛努尔核电设备股份有限公司 | Hundred-ton large-scale three-phase electroslag furnace feeding technique |
| CN107151742A (en) * | 2017-04-20 | 2017-09-12 | 河钢股份有限公司 | A kind of fast automatic feeding technology of electroslag remelting |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1270852C (en) * | 2001-10-23 | 2006-08-23 | 赵士英 | Electroslag remelting feeding process |
-
2005
- 2005-03-28 CN CNB2005100246680A patent/CN100421840C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102876901A (en) * | 2012-09-26 | 2013-01-16 | 攀钢集团江油长城特殊钢有限公司 | Feeding process for vacuum self-consuming smelting of titanium or titanium alloy |
| CN102876901B (en) * | 2012-09-26 | 2014-04-30 | 攀钢集团江油长城特殊钢有限公司 | Feeding process for vacuum self-consuming smelting of titanium or titanium alloy |
| CN102978413A (en) * | 2012-12-14 | 2013-03-20 | 烟台台海玛努尔核电设备股份有限公司 | Hundred-ton large-scale three-phase electroslag furnace feeding technique |
| CN102978413B (en) * | 2012-12-14 | 2013-11-20 | 烟台台海玛努尔核电设备股份有限公司 | Hundred-ton large-scale three-phase electroslag furnace feeding technique |
| CN107151742A (en) * | 2017-04-20 | 2017-09-12 | 河钢股份有限公司 | A kind of fast automatic feeding technology of electroslag remelting |
| CN107151742B (en) * | 2017-04-20 | 2018-05-04 | 河钢股份有限公司 | A kind of fast automatic feeding technology of electroslag remelting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100421840C (en) | 2008-10-01 |
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Granted publication date: 20081001 Termination date: 20140328 |