CN114054704A - Method for controlling temperature of tundish molten steel in heavy rail steel smelting process - Google Patents
Method for controlling temperature of tundish molten steel in heavy rail steel smelting process Download PDFInfo
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- CN114054704A CN114054704A CN202111342037.9A CN202111342037A CN114054704A CN 114054704 A CN114054704 A CN 114054704A CN 202111342037 A CN202111342037 A CN 202111342037A CN 114054704 A CN114054704 A CN 114054704A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 228
- 239000010959 steel Substances 0.000 title claims abstract description 228
- 238000000034 method Methods 0.000 title claims abstract description 69
- 230000008569 process Effects 0.000 title claims abstract description 44
- 238000003723 Smelting Methods 0.000 title claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 46
- 238000007670 refining Methods 0.000 claims abstract description 34
- 238000009749 continuous casting Methods 0.000 claims abstract description 28
- 230000006698 induction Effects 0.000 claims abstract description 21
- 230000008439 repair process Effects 0.000 claims description 5
- 238000005266 casting Methods 0.000 abstract description 20
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000001276 controlling effect Effects 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
- B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
Abstract
The invention discloses a method for controlling the temperature of tundish molten steel in a heavy rail steel smelting process, wherein the heavy rail steel smelting process comprises converter smelting, LF refining, RH refining and continuous casting; the continuous casting process adopts coil type induction heating of a tundish, and the temperature of molten steel in the tundish is controlled by controlling the total power of the coil type induction heating. The method for controlling the temperature of the tundish molten steel in the heavy rail steel smelting process considers the influence of the factors such as the temperature in the molten steel casting process, the state of the ladle, the heating power of the tundish and the like on the temperature control, and stably controls the temperature of the heavy rail steel. According to the weight of molten steel, the state of a steel ladle and the corresponding heating coefficient, a proper heating power formula for controlling the tundish is formulated, and the temperature of the molten steel in the tundish is stably controlled within +/-3 ℃ of the target temperature during the production of the heavy rail steel.
Description
Technical Field
The invention belongs to the field of metallurgy, and particularly relates to a method for controlling the temperature of tundish molten steel in a heavy rail steel smelting process.
Background
The heavy rail steel is an important material for rail transit and is a guarantee for the stable operation of high-speed rails in China. The quality control of the heavy rail steel is related to the stable operation of the high-speed rail, and the quality control of the heavy rail steel is obviously related to the temperature of molten steel in a tundish in the continuous casting process. When the temperature fluctuation is large, the quality of the heavy rail steel continuous casting blank fluctuates greatly. In order to improve the quality level of the heavy rail steel, the temperature of tundish molten steel is stably controlled, so that the overall quality of the heavy rail steel is urgently required to be improved.
In the prior art, similar studies exist.
Chinese patent application CN202110439484.X discloses a continuous casting microalloying production method, relating to the field of metallurgy. The continuous casting microalloying production method comprises the following steps: in the continuous casting process, a plasma heating device with a hollow graphite electrode is used for heating molten steel in a tundish, and metal raw materials are pre-added in the heating process and enter the tundish along with hydrogen through the hollow graphite electrode. The continuous casting microalloying production method can effectively solve the problems of element aggregation in casting , crack generation on the surface of casting and water gap blockage in part of heats in the existing production process, and improves the alloy yield and the alloy quality. The method describes the adoption of plasma heating, and does not consider the influence of factors such as the temperature of the molten steel casting process, the state of a steel ladle, heating power and the like on temperature control.
Based on the above, it is necessary to develop a method for stably and precisely controlling the temperature of tundish molten steel to improve the overall quality of heavy rail steel.
Disclosure of Invention
In view of the above, it is necessary to adopt the following technical solutions:
the invention provides a method for controlling the temperature of tundish molten steel in a heavy rail steel smelting process, which is characterized in that the heavy rail steel smelting process comprises converter smelting, LF refining, RH refining and continuous casting;
the continuous casting process adopts coil type induction heating of a tundish, and the temperature of molten steel in the tundish is controlled by controlling the total power of the coil type induction heating;
the method for controlling the total power of the tundish comprises the following steps:
P＝Q*T/t/N/A/B
q is the heating constant of the molten steel; t is the temperature value, DEG C, of the molten steel in the tundish to be heated; t, the residence time of the molten steel in the heating channel of the tundish s; n-thermal efficiency constant; a, ladle state coefficient; b-molten steel quantity coefficient;
wherein the molten steel amount coefficient is a heating coefficient corresponding to the amount of molten steel entering the tundish.
Further, the temperature value at which the molten steel in the tundish needs to be heated is equal to the target temperature value at which the molten steel in the tundish needs to be heated — the temperature of the molten steel before entering the tundish.
Further, the ladle state coefficient is a heating coefficient corresponding to the state of the ladle.
Further, when the steel ladle state is normal, the steel ladle state coefficient is 0.99; when the ladle state is a minor repair tank or a first tundish furnace, the ladle state coefficient is 0.90; when the ladle state is a overhaul ladle, the ladle state coefficient is 0.80 (only the state of the ladle needs to be determined, and the approximate temperature drop of the ladle needs to be determined, so that the coefficient needing to be heated is determined).
Further, the molten steel amount coefficient is a coefficient corresponding to the amount of molten steel in the ladle.
Further, when the molten steel amount is 0-30t, the molten steel amount coefficient is 1.1; when the molten steel amount is 31-80t, the molten steel amount coefficient is 0.98; and when the molten steel amount is 81-130t, the molten steel amount coefficient is 0.92.
Further, the outlet temperature of the molten steel after RH refining is controlled to be 50-70 ℃ higher than the phase line temperature of the heavy rail molten steel.
Further, the outlet temperature of the molten steel after RH refining is controlled to be 55-60 ℃ above the phase line temperature of the heavy rail molten steel.
Furthermore, the voltage range of the tundish coil type induction heating is 0-3000V, and the current range is 0-1000A.
Further, the temperature value of the molten steel heated by the tundish is equal to the target temperature value of the molten steel in the tundish, which is required to be heated, plus or minus 3 ℃.
The invention has the following beneficial technical effects:
the method for controlling the temperature of the tundish molten steel in the heavy rail steel smelting process considers the influence of the temperature of the molten steel casting process, the ladle state of the tundish, the heating power of the tundish and other factors on the temperature control, and stably controls the temperature of the heavy rail steel. According to the weight of molten steel, the state of a steel ladle and the corresponding heating coefficient, a proper heating power formula for controlling the tundish is formulated, and the temperature of the molten steel in the tundish is stably controlled within +/-3 ℃ of the target temperature during the production of the heavy rail steel.
The method for controlling the temperature of the molten steel in the tundish in the process of smelting the heavy rail steel adopts the induction heating of the tundish, ensures that the temperature of the molten steel in the tundish is stably controlled within +/-3 ℃ of the target temperature during the production of the heavy rail steel, and fully considers the influence of the ladle state of the tundish and the molten steel quantity on the temperature in the process of casting the molten steel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to specific embodiments.
The technical problem to be solved by the invention is to provide a method for controlling the temperature of molten steel in a tundish in the process of smelting heavy rail steel, and the target temperature of the molten steel in the tundish of the heavy rail steel can be effectively controlled within +/-3 ℃ by the control method.
The embodiment of the invention is suitable for all grades of heavy rail steel products, and the adopted process flow is as follows: smelting in a 120t converter, LF refining, RH refining, and continuously casting a large square billet with the thickness of 280mm multiplied by 380mm to obtain heavy rail steel;
in the continuous casting process, coil type induction heating of a tundish is adopted, and the temperature of molten steel in the tundish is controlled by controlling the total power of the tundish;
selecting proper heating power and curve according to the temperature requirement of molten steel, wherein the control method of the total power of the tundish comprises the following steps:
P＝Q*T/t/N/A/B (1)
q-molten steel heating constant, 0.0025 KW.h/(° C.kg); t is the temperature value, DEG C, of the molten steel in the tundish to be heated; t, the residence time of the molten steel in the heating channel of the tundish s; n-thermal efficiency constant, 0.7; a, ladle state coefficient; b-molten steel quantity coefficient;
wherein the molten steel quantity coefficient is a heating coefficient corresponding to the molten steel quantity entering the tundish;
the residence time of the molten steel in the heating channel of the tundish is 1-3 s.
The temperature value of the molten steel in the tundish, which is the target temperature value of the molten steel to be heated, is the temperature of the molten steel before entering the tundish.
When the steel ladle state is normal, the steel ladle state coefficient is 0.99; when the ladle state is a minor repair tank or a first tundish furnace, the ladle state coefficient is 0.90; and when the ladle state is the overhaul tank, the ladle state coefficient is 0.80. For the ladle with 130t molten steel amount in the embodiment, the molten steel amount coefficient includes a coefficient with the molten steel amount of 0-30t, a coefficient with the molten steel amount of 31-80t and a coefficient with the molten steel amount of 81-130 t.
The coefficient of molten steel amount is 1.1 when the molten steel amount is 0-30 t; the coefficient of molten steel amount of 31-80t is 0.98; and the coefficient of the molten steel amount is 0.92 between 81 and 130 t.
The temperature of the molten steel after RH refining is controlled to be 50-70 ℃ higher than the phase line temperature of the heavy rail molten steel.
The temperature of the molten steel after RH refining is controlled to be 55-60 ℃ above the phase line temperature of the heavy rail molten steel.
The voltage range of the tundish coil type induction heating is 0-3000V, the current range is 0-1000A, and the more preferable range is 0-2400V and 0-800A. The set values of the voltage and the current can be obtained from the total power (P) calculated by the formula (1) by using P ═ U × I, and are set specifically in a system of the tundish coil type induction heating.
The temperature value of the molten steel heated by the tundish is equal to the target temperature value of the molten steel in the tundish, which needs to be heated, plus or minus 3 ℃.
The continuous casting temperature of the invention is controlled to be 20-40 ℃ above the phase line temperature of the heavy rail molten steel, and more preferably 25-30 ℃.
Example 1
When the heavy rail steel U75V is produced, the liquidus temperature of the heavy rail steel U75V is 1463 ℃. The adopted process flow comprises the following steps: 120t converter smelting, LF refining, RH refining, and large square billet continuous casting with the diameter of 280mm multiplied by 380 mm.
Controlling the outlet temperature of RH refining of molten steel on heavy rail molten steel temperature as follows: 1523 deg.C.
When the molten steel reaches the continuous casting process, the molten steel amount is 130t, the casting temperature is 1492 ℃, and the target control temperature (the average temperature of the molten steel in a tundish after the molten steel is poured at 130 t) is 1495 ℃. The molten steel needs to be heated to 3 ℃ in a tundish to reach the target control temperature.
The continuous casting process adopts coil type induction heating of a tundish, the ladle is in a hot state (namely a normal state), and the coefficient A is selected to be 0.99. When 0-30t of molten steel is cast into the tundish, selecting a molten steel quantity coefficient B to be 1.1, calculating the total power of the tundish according to a formula (1), selecting a voltage to be 800V, and selecting a current to be 310A; when 31-81t is cast into the tundish, the molten steel quantity coefficient is selected to be 0.98, the total power of the tundish is calculated according to the formula (1), the voltage is selected to be 800V, and the current is selected to be 347A; when 81-130t is cast into the tundish, the molten steel quantity coefficient is selected to be 0.92, the total power of the tundish is calculated according to the formula (1), the voltage is selected to be 800V, and the current is selected to be 386A. Through the total power control of the induction heating of the tundish in stages (different amounts of molten steel poured into the tundish), the temperature of molten steel in the tundish is controlled within the target temperature of 1492-1496 ℃.
Example 2
When the heavy rail steel U71Mn is produced, the liquidus temperature of the heavy rail steel U71Mn is 1469 ℃. The adopted process flow comprises the following steps: 120t converter smelting, LF refining, RH refining, and large square billet continuous casting with the diameter of 280mm multiplied by 380 mm.
Controlling the outlet temperature of RH refining of molten steel on heavy rail molten steel temperature as follows: 1524 deg.C.
When the molten steel reaches the continuous casting process, the molten steel amount is 129t, the casting temperature is 1496 ℃, and the target control temperature (the average temperature of 130t of molten steel in a tundish after the molten steel is poured) is 1498 ℃. The molten steel needs to be heated in the tundish at 2 ℃ to reach the target control temperature.
And a tundish coil type induction heating is adopted in the continuous casting process, the ladle is in a minor repair tank or a tundish first furnace, and the coefficient A is selected to be 0.90. When casting 0-30t to the tundish, selecting a molten steel quantity coefficient B of 1.1, calculating the total power of the tundish according to a formula (1), selecting a voltage of 1000V, and selecting a current of 181A; when 31-81t is cast into the tundish, the molten steel quantity coefficient B is selected to be 0.98, the total power of the tundish is calculated according to the formula (1), then the voltage is selected to be 1000V, and the current is selected to be 204A; when 81-130t is cast into the tundish, the molten steel quantity coefficient B is selected to be 0.92, the total power of the tundish is calculated according to the formula (1), then the voltage is selected to be 1000V, and the current is selected to be 210A. Through the total power control of the staged tundish induction heating (different amounts of molten steel poured into the tundish), the temperature of molten steel in the tundish is controlled within the target temperature of 1495-1501 ℃.
Example 3
The liquidus temperature of heavy rail steel U75V was 1463 ℃. The adopted process flow comprises the following steps: 120t converter smelting, LF refining, RH refining, and large square billet continuous casting with the diameter of 280mm multiplied by 380 mm.
Controlling the outlet temperature of RH refining of molten steel on heavy rail molten steel temperature as follows: 1521 deg.C.
When the molten steel reaches the continuous casting process, the molten steel amount is 130t, the casting temperature is 1491 ℃, and the target control temperature (the average temperature of the molten steel in a tundish after the molten steel is poured at 130 t) is 1495 ℃. The molten steel needs to be heated to 4 ℃ in a tundish to reach the target control temperature.
The continuous casting process adopts coil type induction heating of a tundish, the ladle is in a major repair tank (namely in a cold state), and the coefficient A is selected to be 0.80. When casting 0-30t to the tundish, selecting a molten steel quantity coefficient B of 1.1, calculating the total power of the tundish according to a formula (1), selecting a voltage of 900V, and selecting a current of 454A; when 31-81t is cast into the tundish, the molten steel quantity coefficient B is selected to be 0.98, the total power of the tundish is calculated according to the formula (1), then the voltage is selected to be 900V, and the current is selected to be 510A; when 81-130t is cast into the tundish, the total power of the tundish is calculated according to the formula (1), and then the molten steel quantity coefficient B is selected to be 0.92, the voltage is selected to be 900V, and the current is selected to be 526A. Through the total power control of the induction heating of the tundish in stages (different amounts of molten steel poured into the tundish), the temperature of molten steel in the tundish is controlled within the target temperature 1491-1497 ℃.
Comparative example 1
The liquidus temperature of heavy rail steel U75V was 1463 ℃. The adopted process flow comprises the following steps: 120t converter, LF refining, RH refining, and large square billet continuous casting with the diameter of 280mm multiplied by 380 mm.
The RH refining outlet temperature of the molten steel is controlled to be 1533 ℃ at the temperature of the heavy rail molten steel, and the RH refining temperature is over high and is 70 ℃ higher than the liquidus temperature.
When the molten steel is continuously cast, the molten steel amount is 130t, the casting temperature is 1506 ℃, and the target control temperature is 1495 ℃. Since the casting temperature is higher than the target control temperature, the tundish heating of the molten steel is not required. The temperature of the molten steel in the tundish is controlled within the target temperature of 1494-1506 ℃.
Comparative example 1 illustrates that if the RH-refined outlet temperature of molten steel is not controlled to 50 to 70 c above the phase line temperature of heavy rail molten steel, the temperature control of the subsequent tundish is affected.
Comparative example 2
The liquidus temperature of heavy rail steel U71Mn was 1469 ℃ when produced. The adopted process flow comprises the following steps: 120t converter, LF refining, RH refining, and large square billet continuous casting with the diameter of 280mm multiplied by 380 mm.
The RH refining leaving temperature of the molten steel is controlled to be 1505 ℃ at the temperature of the heavy rail molten steel, the RH refining temperature is too low and is 36 ℃ lower than the liquidus temperature.
When the molten steel is continuously cast, the molten steel amount is 129t, the casting temperature is 1475 ℃, and the target control temperature is 1498 ℃. The molten steel needs to be heated to 23 ℃ to reach a target value.
The continuous casting process adopts coil type induction heating of a tundish, the ladle is in a state of overhauling the tank, and the coefficient A is selected to be 0.80. When casting is carried out for 0-30t, the molten steel quantity coefficient is selected to be 1.1, the voltage is selected to be 2400V, and the current is selected to be 800A; when 31-81t of casting is carried out, the molten steel quantity coefficient is selected to be 0.98, the voltage is selected to be 2400V, and the current is selected to be 800A; when casting is carried out for 81-130t, the molten steel quantity coefficient is selected to be 0.92, the voltage is selected to be 2400V, and the current is selected to be 800A. Through the total power control of the induction heating of the tundish, the temperature of molten steel in the tundish is controlled within 1475 ℃ and 1485 ℃.
Comparative example 2 illustrates that if the RH refining leaving temperature of molten steel is not controlled to be 50-70 ℃ above the phase line temperature of heavy rail molten steel, the temperature control of the subsequent tundish is affected.
Comparative example 3
The liquidus temperature of heavy rail steel U71Mn was 1469 ℃ when produced. The adopted process flow comprises the following steps: 120t converter, LF refining, RH refining, and large square billet continuous casting with the diameter of 280mm multiplied by 380 mm.
Controlling the RH leaving temperature of the molten steel on the heavy rail at the temperature of the molten steel of the heavy rail as follows: 1505 ℃.
When the molten steel is continuously cast, the molten steel amount is 129t, the casting temperature is 1475 ℃, and the target control temperature is 1498 ℃. The molten steel needs to be heated to 23 ℃ to reach a target value.
The continuous casting process adopts coil induction heating of a tundish, does not consider the state of a ladle and the molten steel amount, does not adjust electric power according to different casting molten steel amounts as described in embodiments 1-3, only selects 1000V of voltage and 800A of current, and controls the temperature of the molten steel in the tundish within 1500-1508 ℃.
Comparative example 3 illustrates that the temperature of molten steel cannot be accurately controlled at a target temperature value without finely regulating the total power of the tundish.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. Although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (10)
1. The method for controlling the temperature of tundish molten steel in the heavy rail steel smelting process is characterized in that the heavy rail steel smelting process comprises converter smelting, LF refining, RH refining and continuous casting;
the continuous casting process adopts coil type induction heating of a tundish, and the temperature of molten steel in the tundish is controlled by controlling the total power of the coil type induction heating;
the method for controlling the total power of the tundish comprises the following steps:
P＝Q*T/t/N/A/B
q is the heating constant of the molten steel; t is the temperature value, DEG C, of the molten steel in the tundish to be heated; t, the residence time of the molten steel in the heating channel of the tundish s; n-thermal efficiency constant; a, ladle state coefficient; b-molten steel quantity coefficient;
wherein the molten steel amount coefficient is a heating coefficient corresponding to the amount of molten steel entering the tundish.
2. The method for controlling the temperature of molten steel in a tundish in a heavy rail steel smelting process according to claim 1, wherein the temperature of molten steel in the tundish, which is a target temperature of molten steel in the tundish, is the temperature of molten steel before entering the tundish.
3. The method for controlling the temperature of molten steel in a tundish of a heavy rail steel smelting process according to claim 1, wherein the ladle state coefficient is a heating coefficient corresponding to the state of the ladle.
4. The method for controlling the temperature of tundish molten steel in a heavy rail steel smelting process according to claim 3, wherein the ladle condition coefficient is 0.99 when the ladle condition is normal; when the ladle state is a minor repair tank or a first tundish furnace, the ladle state coefficient is 0.90; and when the ladle state is the overhaul tank, the ladle state coefficient is 0.80.
5. The method for controlling the temperature of molten steel in a tundish of a heavy rail steel smelting process according to claim 1, wherein the molten steel amount coefficient is a coefficient corresponding to the amount of molten steel in the ladle.
6. The method for controlling the temperature of molten steel in a tundish of a heavy rail steel smelting process according to claim 5, wherein the molten steel quantity coefficient is 1.1 when the molten steel quantity is 0-30 t; when the molten steel amount is 31-80t, the molten steel amount coefficient is 0.98; and when the molten steel amount is 81-130tt, the molten steel amount coefficient is 0.92.
7. The method for controlling the temperature of molten steel in a tundish of a heavy rail steel smelting process according to claim 1, wherein the temperature of molten steel leaving the tundish after RH refining is controlled to be 50-70 ℃ above the phase line temperature of the heavy rail steel.
8. The method for controlling the temperature of molten steel in a tundish of a heavy rail steel smelting process according to claim 7, wherein the temperature of molten steel leaving the RH refining furnace is controlled to be 55-60 ℃ higher than the phase line temperature of the heavy rail steel.
9. The method for controlling the temperature of tundish molten steel in a heavy rail steel smelting process according to claim 1, wherein the voltage range of the tundish coil type induction heating is 0-3000V, and the current range is 0-1000A.
10. The method for controlling the temperature of molten steel in a tundish in a heavy rail steel smelting process according to claim 2, wherein the temperature of the molten steel heated in the tundish is ± 3 ℃ which is a target temperature of the molten steel in the tundish to be heated.
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2021
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| CN116117095A (en) * | 2023-01-06 | 2023-05-16 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and preparation method thereof |
| CN116117095B (en) * | 2023-01-06 | 2023-06-20 | 江苏省沙钢钢铁研究院有限公司 | High-carbon steel wire rod and preparation method thereof |
| CN116011149A (en) * | 2023-01-18 | 2023-04-25 | 鞍钢股份有限公司 | Method for determining target moving-out temperature of RH refining furnace |
| CN116011149B (en) * | 2023-01-18 | 2023-10-20 | 鞍钢股份有限公司 | Method for determining target moving-out temperature of RH refining furnace |
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Application publication date: 20220218 |