CN117431392A - Continuous casting billet heating device and method - Google Patents
Continuous casting billet heating device and method Download PDFInfo
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- CN117431392A CN117431392A CN202210817774.8A CN202210817774A CN117431392A CN 117431392 A CN117431392 A CN 117431392A CN 202210817774 A CN202210817774 A CN 202210817774A CN 117431392 A CN117431392 A CN 117431392A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 221
- 238000009749 continuous casting Methods 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 42
- 230000006698 induction Effects 0.000 claims abstract description 113
- 238000004321 preservation Methods 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 4
- 230000010355 oscillation Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 11
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000009826 distribution Methods 0.000 description 6
- 238000005098 hot rolling Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013072 incoming material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 208000029154 Narrow face Diseases 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
Abstract
The invention discloses a continuous casting billet heating device and a method, comprising a first induction heating unit and a second induction heating unit; the first induction heating unit comprises a first induction coil which is arranged around the length direction and the width direction of the continuous casting billet; the second induction heating unit comprises a second induction coil which is arranged around the length direction and the thickness direction of the continuous casting billet, and a temperature measuring instrument which is used for detecting the surface temperature of the continuous casting billet. The invention effectively solves the induction heating requirements under two working conditions in the prior art, completely meets the requirements of products and processes on heating temperature and continuous casting billet temperature uniformity, and finally can realize the technical requirements of the integral temperature difference of continuous casting billets within +/-10 ℃.
Description
Technical Field
The invention relates to the technical field of electromagnetic induction heating of hot rolling production lines, in particular to a continuous casting billet heating device and a continuous casting billet heating method.
Background
In the production process of modern steel products, a certain distance exists between a continuous casting process and a hot rolling process, and the surface of a continuous casting blank is often required to be treated, so that the common temperature drop is serious, and the continuous casting blank must be sent into a heating furnace to be heated before entering a rolling mill, so that the temperature of the continuous casting blank reaches the technical requirements related to hot rolling. The average temperature of the continuous casting blank entering the furnace under the traditional production process is generally 300-400 ℃, and the temperature of the continuous casting blank entering the furnace can be increased to more than 800 ℃ by improving the process. However, the traditional gas furnace has high heating burnup, which is generally between 30 and 50Kgce/t, and is one of the main sources of carbon emission in the casting and rolling interface of steel products.
On the other hand, the induction heating technology has been widely used in industrial production due to its technical advantages of green, low carbon, no pollution, fast heating speed, easy automation, etc. Depending on the relationship between the magnetic field direction perpendicular to the steel sheet surface and the longitudinal magnetic field induction heating, the magnetic field direction parallel to the steel sheet surface can be generally classified into transverse magnetic field induction heating and longitudinal magnetic field induction heating. In addition to the above technical advantages, induction heating techniques also suffer from poor temperature uniformity compared to conventional heating methods. These problems are dependent on the specific operating conditions, for which the technical specialists propose corresponding solutions and concepts. Chinese patent CN100488324C proposes a device and method for arranging two layers of transverse magnetic coils in a staggered manner, and configuring an iron core for flexible control. The long side of the lower coil is perpendicular to the moving direction of the steel plate, and the long side of the upper coil is parallel to the moving direction of the steel plate. This assumption does not essentially contribute to improving the overall temperature uniformity of the steel sheet, since with transverse magnetic induction heating techniques the temperature assumes a non-linear distribution at the edges of the steel sheet due to the presence of end effects, especially when the coil length is greater than the width of the steel sheet, which can be much higher than the middle temperature. Although the method can effectively reduce the temperature of the edge of the steel plate theoretically by changing the eddy current distribution, a plurality of local small eddy currents are generated by superposition of coils, so that the induction heating efficiency is low, and the grid-shaped heating effect is also caused by the existence of the local small eddy currents, so that the method has no great industrial application value in practice. U.S. patent No. 5403994a proposes to heat by using a pair of J-coils which are paired with each other, and the heating range of the J-coils can be controlled by sliding adjustment according to the specifications of the heated steel plates. Two major problems of the method are that the coil is heated for a long time by sliding contact, particularly the problem of poor contact or ignition under high power condition is necessarily existed, and the service life and production of the coil are affected; on the other hand, the design cannot change the problems of overhigh temperature at the edge of the steel plate and uneven overall temperature. U.S. patent No. 20170002438A1 proposes a method for installing a shielding plate between an induction coil and a heated steel plate to control the problem of excessive temperature at the edge of the steel plate, which can improve the temperature uniformity to a certain extent, but the adjustment of the shielding plate cannot meet the index requirement of the process on the temperature uniformity of the plate surface.
In the existing continuous casting production, on one hand, the thickness of a continuous casting blank of the traditional continuous casting is generally between 150 and 300mm, the surface temperature of a casting blank outlet casting machine is more than 800 ℃, the core temperature is about 1000 ℃, particularly, the temperature of the corners and the head and the tail of the continuous casting blank has obvious temperature drop phenomenon, and the temperature of the corners is lower than the middle temperature by more than 150 ℃. On the other hand, the hot rolling temperature is usually required to be between 1100 and 1200 ℃ and the overall temperature difference of the slab is required to be within + -10 ℃. To achieve this target temperature and temperature uniformity, the continuous casting slab must be heated. Meanwhile, in order to meet production requirements such as capacity matching, quick heating modes such as induction heating and the like are needed, and a casting blank is heated to a target temperature in a short time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a continuous casting billet heating device and a continuous casting billet heating method, which effectively solve the induction heating requirements under two working conditions in the prior art, completely meet the requirements of products and processes on heating temperature and continuous casting billet temperature uniformity, and finally can realize the technical requirements of the integral temperature difference of continuous casting billets within +/-10 ℃.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in one aspect, a continuous casting billet heating apparatus includes a first induction heating unit and a second induction heating unit;
the first induction heating unit comprises a first induction coil which is arranged around the length direction and the width direction of the continuous casting billet;
the second induction heating unit comprises a second induction coil which is arranged around the length direction and the thickness direction of the continuous casting billet, and a temperature measuring instrument which is used for detecting the surface temperature of the continuous casting billet.
Preferably, the first induction coil is formed by winding one or more turns of copper pipes;
the magnetic field center line generated by the first induction coil is perpendicular to the wide surface of the continuous casting billet;
the second induction coil is formed by winding a copper pipe with a plurality of turns;
the magnetic field center line generated by the second induction coil is parallel to the wide surface of the continuous casting billet.
Preferably, the temperature measuring instrument is an infrared temperature measuring instrument, and at least one group of temperature measuring instruments is arranged.
Preferably, the heating frequency f of the first induction heating unit 1 The requirements are as follows: 50Hz is less than or equal to f 1 ≤500Hz；
The heating frequency f of the second induction heating unit 2 The requirements are as follows: 100Hz is less than or equal to f 2 ≤1000Hz。
On the other hand, the continuous casting billet heating method adopts the continuous casting billet heating device to heat the same continuous casting billet in the same time, so as to realize the heating of the continuous casting billet in two stages.
Preferably, after the first induction heating unit heats the continuous casting billet, the midpoint temperature T of the surface of the continuous casting billet in the thickness direction 1 And a heating target temperature T 0 The requirements are as follows: t at-10 DEG C 1 -T 0 Heating for a total time t at a temperature of less than or equal to 10 DEG C 1 ≤3min。
Preferably, when the continuous casting billet enters the first induction heating unit, the core temperature Tc, the surface center temperature Tb and the heating target temperature T of the continuous casting billet 0 The requirements are as follows:
T 0 -Tc＜100℃
T 0 -Tb＜350℃。
preferably, the second induction heating unit heats the continuous casting billet in two stages, wherein the first stage is a rapid heating stage and the second stage is a heat preservation stage;
the second induction heating unit heats the surface temperature of the continuous casting blank to a heating target temperature T in the rapid heating stage 0 -10 ℃, then reducing the heating power of the second induction heating unit into the soak phase;
and the heat preservation stage adopts heating power which changes along with time to perform oscillation heating, and forms a wave curve of which the heating time corresponds to the heating power.
Preferably, the wave curve needs to satisfy:
one or more power values Pn and n are odd numbers on the wave curve, wherein the minimum power in a curve section of the wave curve is arbitrarily intercepted, the curve section comprises the power values Pn and the time is not more than 3min, pn is less than 10% multiplied by P0, and P0 is the average value of the heating power in the rapid heating stage;
one or more power values Pm exist on the wave curve, m is an odd number, and is the maximum power in a curve section of the wave curve which is arbitrarily intercepted, the curve section comprises the power values Pm and the time is not more than 3min, pm is more than 30% multiplied by P0, and P0 is the average value of the heating power in the rapid heating stage;
the power values Pn and Pm are distributed alternately and at intervals on the wave curve.
Preferably, the height Wc of the energized portion of the second induction coil of the second induction heating unit is required to satisfy:
and the W is more than or equal to 200mm and less than or equal to 600mm, wherein W is the width of the continuous casting blank.
Preferably, the width W of the continuous casting blank is 850mm less than or equal to W less than or equal to 2050mm, the thickness H is 150mm less than or equal to H less than or equal to 300mm, and the length L is 4000mm less than or equal to L less than or equal to 12000mm.
Preferably, when the first induction heating unit heats the continuous casting billet, the wide surface of the continuous casting billet is parallel to a horizontal plane;
when the second induction heating unit heats the continuous casting billet, the wide surface of the continuous casting billet is vertical to the horizontal plane.
According to the continuous casting billet heating device and method provided by the invention, two groups of induction heating modes are specifically provided for heating according to the temperature distribution characteristics of the continuous casting billet in the induction heating process, and the temperature compensation and the integral heating of the corners of the continuous casting billet are considered, so that the target temperature requirement set by the process is realized. The continuous casting billet heating device and the continuous casting billet heating method can effectively solve the problem of non-uniformity of temperature distribution commonly existing in the continuous casting billet induction heating process, flexibly adjust heating process parameters according to the specification of the continuous casting billet and the change of the incoming material temperature, adapt to heating requirements under various working conditions, and achieve higher heating efficiency while ensuring the temperature uniformity.
Drawings
FIG. 1 is a schematic top view of a first induction heating unit of the strand heating apparatus of the present invention;
FIG. 2 is a schematic side view of a first induction heating unit of the strand heating apparatus of the present invention;
FIG. 3 is a schematic side view of a second induction heating unit of the strand heating apparatus of the present invention corresponding to a narrow face of a second induction coil;
FIG. 4 is a schematic side view of a second induction heating unit of the strand heating apparatus of the present invention corresponding to the broad face of a second induction coil;
FIG. 5 is a schematic diagram showing heating power curves of a continuous casting billet entering a second induction heating unit, passing through a rapid heating stage and entering a heat preservation stage after the surface reaches a target temperature in an embodiment of the continuous casting billet heating method of the present invention;
FIG. 6 is a schematic diagram of a heating curve of an embodiment of a continuous casting billet heating method according to the present invention.
Detailed Description
In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
The continuous casting billet heating device provided by the invention comprises a first induction heating unit 100 and a second induction heating unit 200.
Shown in combination with FIGS. 1 and 2Heating frequency f of first induction heating unit 100 1 The requirements are as follows: 50Hz is less than or equal to f 1 The first induction heating unit 100 includes a first induction coil 101 disposed around the length and width directions of the continuous casting billet 300, the first induction coil 101 being one or more turns of copper pipe, the magnetic field center line generated by the first induction coil 101 being perpendicular to the wide surface of the continuous casting billet 300.
As shown in conjunction with fig. 3 and 4, the heating frequency f of the second induction heating unit 200 2 The requirements are as follows: 100Hz is less than or equal to f 2 The second induction heating unit 200 includes a second induction coil 201 disposed around the length and thickness directions of the continuous casting billet 300, the second induction coil 201 being a copper pipe with a plurality of turns, the center line of the magnetic field generated by the second induction coil 201 being parallel to the wide surface of the continuous casting billet 300.
The second induction heating unit 200 further includes a thermo detector 202 for detecting the surface temperature of the continuous casting billet 300, where the thermo detector 202 is an infrared thermo detector, at least one thermo detector (two thermo detectors 202 are provided as shown in fig. 3) is provided, and the heating power of the second induction heating unit 200 is corrected by using the surface temperature value of the continuous casting billet 300 detected by the thermo detector 202.
The invention also provides a continuous casting billet heating method, in order to meet the requirement of process set heating temperature uniformity, the continuous casting billet 300 is not heated in the same time by adopting the continuous casting billet heating device, and the first induction heating unit 100 and the second induction heating unit 200 are independently controllable, so that the continuous casting billet is heated in two stages.
After the first induction heating unit 100 heats the continuous casting slab 300, the temperature T at the midpoint of the surface of the continuous casting slab 300 in the thickness direction 1 And a heating target temperature T 0 The requirements are as follows: t at-10 DEG C 1 -T 0 Heating for a total time t at a temperature of less than or equal to 10 DEG C 1 ≤3min。
When the continuous casting slab 300 enters the first induction heating unit 100, the core temperature Tc, the surface center temperature Tb, and the heating target temperature T of the continuous casting slab 300 0 The requirements are as follows:
T 0 -Tc＜100℃
T 0 -Tb＜350℃。
the second induction heating unit 200 heats the continuous casting billet 300 in two stages, the first stage being a rapid heating stage and the second stage being a heat-preserving stage;
the second induction heating unit 200 heats the surface temperature of the continuous casting billet 300 to the heating target temperature T at the time of the rapid heating stage 0 The heating power of the second induction heating unit 200 is then reduced to a 10 c temperature and enters the soak phase.
The heat preservation stage adopts heating power which changes along with time to carry out oscillation heating, and forms a wave curve with heating time corresponding to the heating power.
The wave curve needs to satisfy:
1) One or more power values Pn exist on the wave curve, n is an odd number, the minimum power in a curve section of the wave curve is arbitrarily intercepted, the curve section comprises the power values Pn and the time is not more than 3min, pn is less than 10% multiplied by P0, and P0 is the average value of heating power in a rapid heating stage;
2) One or more power values Pm exist on the wave curve, m is an odd number, the maximum power in a curve section of the wave curve is arbitrarily intercepted, the curve section comprises the power value Pm and the time is not more than 3min, pm is more than 30 percent multiplied by P0, and P0 is the average value of heating power in a rapid heating stage;
3) The power values Pn and Pm are alternately distributed at intervals on the wave curve.
The height Wc of the energized portion of the second induction coil 201 of the second induction heating unit 200 is required to satisfy:
and the W is more than or equal to 200mm and less than or equal to 600mm, wherein W is the width of the continuous casting billet 300.
The width W of the continuous casting blank 300 is equal to or less than 850mm and equal to or less than 2050mm, the thickness H is equal to or less than 150mm and equal to or less than 300mm, and the length L is equal to or less than 4000mm and equal to or less than 12000mm.
When the first induction heating unit 100 heats the continuous casting billet 300, the wide surface of the continuous casting billet 300 is parallel to the horizontal plane;
when the second induction heating unit 200 heats the continuous casting slab 300, the wide surface of the continuous casting slab 300 is perpendicular to the horizontal plane.
The continuous casting billet has a temperature drop phenomenon in the production process and must be heated before entering the rolling process. The traditional heating method has long heating time, high energy consumption and serious surface burning loss, and the energy conservation and emission reduction requirements of steel production under new situation are difficult to meet. In order to meet the temperature uniformity requirement of the hot rolling process on the continuous casting billet at +/-10 ℃, only longitudinal magnetic coils or scanning induction heating are adopted, and the heating requirement of the continuous casting billet cannot be met in engineering. In particular, the continuous casting billet itself has heat dissipation at corners, the temperature at corners is usually 150 ℃ lower than that at the middle, and the longitudinal magnetic coil or scanning induction heating mode cannot effectively compensate the low temperature area at corners. After being heated by adopting a longitudinal magnetic coil or scanning induction heating mode, the low-temperature area at the corner is still lower than the 100 ℃ in the middle area.
According to the continuous casting billet heating device and method provided by the invention, two groups of induction heating modes are specifically provided for heating according to the temperature distribution characteristics of the continuous casting billet in the induction heating process, and the temperature compensation and the integral heating of the corners of the continuous casting billet are considered, so that the target temperature requirement set by the process is realized. The continuous casting billet heating device and the continuous casting billet heating method can effectively solve the problem of non-uniformity of temperature distribution commonly existing in the continuous casting billet induction heating process, flexibly adjust heating process parameters according to the specification of the continuous casting billet and the change of the incoming material temperature, adapt to the heating requirements under various working conditions, ensure the temperature uniformity and achieve higher heating efficiency, and can realize the technical requirements of the integral temperature difference of the continuous casting billet within +/-10 ℃ after implementation.
Examples
Heated strand 300 gauge: 10000mm×1450mm×230mm, when entering the first induction heating unit 100, the core temperature of the continuous casting billet 300 is about 1060 ℃, the surface center temperature is about 880 ℃, the head-tail and side temperatures are about 700 ℃, and the heating target temperature is 1130 ℃. The continuous casting billet 300 is horizontally placed, after being conveyed to a heating station through a roller way, the first induction heating unit 100 is firstly positioned corresponding to the first heating coil 101 through a mechanical moving mechanism, and the system is electrified for heating after detecting no errors, as shown in fig. 1 and 2. The heating setting frequency of the first induction heating unit 100 is 50Hz, and the heating power is controlled to heat the center point temperature of the narrow surface of the continuous casting billet 300 to be within 1130+/-10 ℃ within 3 minutes.
After the heating is finished, the continuous casting billet is moved to the second induction heating unit 200 corresponding to the second induction coil 201 through the mechanical transmission and turnover mechanism, so that the continuous casting billet 300 is placed perpendicular to the horizontal plane and kept centered with the second induction coil 201, as shown in fig. 3 and 4. The height 1850mm of the energized section of the second induction coil 201, that is, the upper and lower sides of the second induction coil 201 are respectively 200mm higher than the continuous casting slab 300. Meanwhile, the continuous casting billet 300 is fixed correspondingly, and the second induction coil 201 is sealed up and down correspondingly. The second induction heating unit 200 sets a heating frequency of 250Hz, and after each module of the system detects no errors, the system is electrified and heated. The heating is divided into two stages, the first stage is a rapid heating stage, the heating power P0 is about 10MW, and the heating time is about t 21 About 3 minutes. The surface temperature of the continuous casting billet 300 is detected at any time by the thermometer 202 arranged in the middle of the second induction coil 201, when the surface heating temperature of the continuous casting billet 300 reaches 1130 ℃, the heating power is reduced to enter the heat preservation stage of the second stage, and the heating time t of the heat preservation stage is longer 22 About 12min. The power curve for the soak phase is shown in fig. 5. The heating power was first reduced rapidly to 6.9% of P0 in one minute, then increased again to 57.4% of P0 in one minute, then reduced again to 3.9% of P0, and so on until the heating was completed. Specific Pn and Pm set ratio values are shown in table 1, and by continuously adjusting the heating power set values, the heating power exhibits a fluctuation curve which continuously changes with time.
TABLE 1
| No | TIME(s) | Power/P0 |
| P0 | 0 | 100.0％ |
| P1 | 60 | 6.9％ |
| P2 | 120 | 57.4％ |
| P3 | 180 | 3.9％ |
| P4 | 240 | 39.2％ |
| P5 | 300 | 3.9％ |
| P6 | 360 | 36.8％ |
| P7 | 420 | 1.7％ |
| P8 | 480 | 35.3％ |
| P9 | 540 | 1.7％ |
| P10 | 600 | 31.5％ |
| P11 | 660 | 3.9％ |
| P12 | 720 | 10.9％ |
Temperature detection points are set at different positions of the continuous casting billet 300, and the corresponding positions of each point are respectively as follows:
SENSOR_1: at the center of the continuous casting billet
Sensor_2: the center of the wide surface of the continuous casting blank
Sensor_3: 20mm below the center of the wide surface of the continuous casting billet
Sensor_4: 20mm away from the narrow surface and 20mm below the wide surface of the continuous casting billet
Sensor_5: 20mm from the narrow surface and 115mm below the wide surface of the continuous casting billet
As can be seen from the heating process temperature rise curve displayed by each point, after the heating is finished, the temperature of each point is basically between 1120 ℃ and 1140 ℃ and meets the temperature uniformity requirement within 1130+/-10 ℃ set by the process, as shown in figure 6.
Under the current carbon peak and carbon neutralization related requirements, the steel industry increasingly strictly controls the carbon emission in the whole process production process, and increasingly pays attention to the energy saving and consumption reduction of each process. The induction heating technology has become an indispensable metallurgical proprietary technology in the production process of steel products due to the remarkable advantages of green low carbon, high heating speed and the like. The combined induction heating device and the method have the advantages of ingenious design, flexible functions, low equipment processing and manufacturing difficulties, and convenient equipment installation and replacement, and have wide expected use prospect, and the uniformity of heating temperature and the heating efficiency are both considered.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (12)
1. A continuous casting billet heating device, which is characterized in that: comprises a first induction heating unit and a second induction heating unit;
the first induction heating unit comprises a first induction coil which is arranged around the length direction and the width direction of the continuous casting billet;
the second induction heating unit comprises a second induction coil which is arranged around the length direction and the thickness direction of the continuous casting billet, and a temperature measuring instrument which is used for detecting the surface temperature of the continuous casting billet.
2. The continuous casting billet heating apparatus according to claim 1, wherein: the first induction coil is formed by winding one or more turns of copper pipes;
the magnetic field center line generated by the first induction coil is perpendicular to the wide surface of the continuous casting billet;
the second induction coil is formed by winding a copper pipe with a plurality of turns;
the magnetic field center line generated by the second induction coil is parallel to the wide surface of the continuous casting billet.
3. The continuous casting billet heating apparatus according to claim 1, wherein: the temperature measuring instrument is an infrared temperature measuring instrument and is provided with at least one group.
4. The continuous casting billet heating device according to claim 1, wherein the heating frequency f of the first induction heating unit 1 The requirements are as follows: 50Hz is less than or equal to f 1 ≤500Hz；
The heating frequency f of the second induction heating unit 2 The requirements are as follows: 100Hz is less than or equal to f 2 ≤1000Hz。
5. A method of heating a continuous casting, characterized by: the use of a strand heating device according to one of claims 1 to 4 for heating the same strand at different times results in a two-stage heating of the strand.
6. The method according to claim 5, wherein after the first induction heating unit heats the continuous casting, the temperature T is at a midpoint of a surface in a thickness direction of the continuous casting 1 And a heating target temperature T 0 The requirements are as follows: t at-10 DEG C 1 -T 0 Heating for a total time t at a temperature of less than or equal to 10 DEG C 1 ≤3min。
7. The method according to claim 5, wherein the core temperature Tc, the surface center temperature Tb, and the heating target temperature T of the continuous casting blank are set at the time of entering the first induction heating unit 0 The requirements are as follows:
T 0 -Tc＜100℃
T 0 -Tb＜350℃。
8. the continuous casting billet heating method according to claim 5, wherein: the second induction heating unit heats the continuous casting billet in two stages, wherein the first stage is a rapid heating stage and the second stage is a heat preservation stage;
the second induction heating unit heats the surface temperature of the continuous casting blank to a heating target temperature T in the rapid heating stage 0 -10 ℃, then reducing the heating power of the second induction heating unit into the soak phase;
and the heat preservation stage adopts heating power which changes along with time to perform oscillation heating, and forms a wave curve of which the heating time corresponds to the heating power.
9. The method of claim 8, wherein the wave profile is such that:
one or more power values Pn and n are odd numbers on the wave curve, wherein the minimum power in a curve section of the wave curve is arbitrarily intercepted, the curve section comprises the power values Pn and the time is not more than 3min, pn is less than 10% multiplied by P0, and P0 is the average value of the heating power in the rapid heating stage;
one or more power values Pm exist on the wave curve, m is an odd number, and is the maximum power in a curve section of the wave curve which is arbitrarily intercepted, the curve section comprises the power values Pm and the time is not more than 3min, pm is more than 30% multiplied by P0, and P0 is the average value of the heating power in the rapid heating stage;
the power values Pn and Pm are distributed alternately and at intervals on the wave curve.
10. The continuous casting slab heating method according to claim 8, wherein the height Wc of the energized portion on the second induction coil of the second induction heating unit is required to satisfy:
and the W is more than or equal to 200mm and less than or equal to 600mm, wherein W is the width of the continuous casting blank.
11. The continuous casting billet heating method according to claim 5, wherein: the width W of the continuous casting blank is not less than 850mm and not more than 2050mm, the thickness H is not less than 150mm and not more than 300mm, and the length L is not less than 4000mm and not more than 12000mm.
12. The continuous casting billet heating method according to claim 5, wherein: when the first induction heating unit heats the continuous casting billet, the wide surface of the continuous casting billet is parallel to a horizontal plane;
when the second induction heating unit heats the continuous casting billet, the wide surface of the continuous casting billet is vertical to the horizontal plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210817774.8A CN117431392A (en) | 2022-07-12 | 2022-07-12 | Continuous casting billet heating device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210817774.8A CN117431392A (en) | 2022-07-12 | 2022-07-12 | Continuous casting billet heating device and method |
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| CN117431392A true CN117431392A (en) | 2024-01-23 |
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| CN202210817774.8A Pending CN117431392A (en) | 2022-07-12 | 2022-07-12 | Continuous casting billet heating device and method |
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| CN (1) | CN117431392A (en) |
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