CN106141132A - The manufacture method of strand and continuous casting apparatus - Google Patents
The manufacture method of strand and continuous casting apparatus Download PDFInfo
- Publication number
- CN106141132A CN106141132A CN201510149261.4A CN201510149261A CN106141132A CN 106141132 A CN106141132 A CN 106141132A CN 201510149261 A CN201510149261 A CN 201510149261A CN 106141132 A CN106141132 A CN 106141132A
- Authority
- CN
- China
- Prior art keywords
- strand
- molten steel
- temperature
- tundish
- speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Continuous Casting (AREA)
Abstract
The present invention provides a kind of continuous casting apparatus, and it has tundish, mold and slighter compress portion, is used for manufacturing strand, and wherein, this continuous casting apparatus includes: temperature detector, and it is for detecting the temperature of the molten steel in tundish；Molten steel heater, it is for heating the molten steel in tundish；Speed detector, it is for detecting the casting speed of strand；Speed adjustment portion, it is used for adjusting casting speed；1st control portion, it is for controlling within molten steel heater maintains 10 DEG C with the amplitude of fluctuation by the temperature of molten steel；And the 2nd control portion, its for control speed adjustment portion so that the velocity deviation of casting speed is maintained ± 10% within.
Description
Technical field
The present invention relates to manufacture method and the continuous casting apparatus of strand.
Background technology
The continuous casting apparatus of strand includes: mold, and the molten steel poured into a mould via nozzle from tundish is entered by it
Row cooling, forms the strand of preliminary dimension；And strand support, the casting that its supporting surface element has solidified
Base, and from mold, pull out strand continuously.In the slighter compress portion being located at strand support, by right
Top (wick-containing terminal part (Japanese: Network レ タ エ Application De the portion)) pressurization in the portion that do not solidifies of strand,
Thus decrease the segregation at the central part of strand.
It is known to a kind of in order to carry out the operation of slighter compress near the top in portion not solidifying of strand and set
Put ultrasound transmitter device and supersonic detector to detect the technology on the top in the portion that do not solidifies of strand.Separately
Outward, patent documentation 1 (Japanese Unexamined Patent Publication 1-271047) proposes a kind of utilization between pressure roller
Situation about changing every the change of the curdled appearance along with strand does not solidifies portion to infer strand
The technology on top.
Summary of the invention
As in the past like that, using what ultrasound transmitter device and supersonic detector detected strand not solidify portion
Top technology in, can worry apparatus structure complicate and be difficult to stably and accurately detect.
It addition, in the method for the above-mentioned patent documentation 1 of the situation utilizing the interval of pressure roller to change, difficult
To infer the top in the portion that do not solidifies of strand with sufficiently high precision, the most sometimes cannot be come by slighter compress
The segregation of the central part of suppression strand.
Therefore, in the present invention, the purpose of an aspect is to provide one can be adequately suppressed center
The manufacture method of the strand of the segregation at portion.The purpose of another aspect of the present invention is to provide a kind of energy
Enough it is adequately suppressed the continuous casting apparatus of segregation at the central part of strand.
The present invention provides the manufacture method of a kind of strand in one aspect, and its use has tundish, mold
And the continuous casting apparatus in slighter compress portion, wherein, the manufacture method of this strand includes following operation: make
Within the amplitude of fluctuation of the temperature of the molten steel in described tundish being maintained 10 DEG C by molten steel heater, and
And the velocity deviation of casting speed is maintained ± 10% within, from described mold, pull out strand simultaneously.
According to above-mentioned manufacture method, by using molten steel heater, thus the molten steel in inhibiting tundish
Cool down because of heat radiation, within the temperature change amplitude of the molten steel in tundish has been maintained 10 DEG C.Additionally,
The velocity deviation of the casting speed of strand has been maintained ± 10% within.So, by reducing fully
The amplitude of fluctuation of the temperature of the molten steel in tundish and the velocity deviation of strand, it is possible to not coagulating of suppression strand
Gu the position on the top in portion changes.Thereby, it is possible to maintain strand consistently not with higher precision
Relative position relationship between the top in solidification portion with slighter compress portion.Thus, the most reliably play
The slighter compress inhibitory action to center segregation.It is as a result, it is possible to manufacture and suppressed sufficiently at central part
The strand of segregation.
Can also be that above-mentioned manufacture method includes following operation: circulate between mold and slighter compress portion
Strand for feedwater or the mixture of water and air.
The present invention provides a kind of continuous casting apparatus on the other hand, and it has tundish, mold and light
Depression, is used for manufacturing strand, and wherein, this continuous casting apparatus includes: temperature detector, and it is used for
The temperature of the molten steel in detection tundish；Molten steel heater, it is for heating molten steel；Speed is examined
Surveying device, it is for detecting the casting speed of strand；Speed adjustment portion, it is used for adjusting casting speed；The
1 control portion, it is for controlling molten steel heater the amplitude of fluctuation of the temperature of the molten steel in tundish to be tieed up
Hold within 10 DEG C；And the 2nd control portion, it is for controlling speed adjustment portion with by the speed of casting speed
Degree deviation maintain ± 10% within.
Above-mentioned continuous casting apparatus includes: the 1st control portion, and it is used for controlling molten steel heater with by centre
Within the amplitude of fluctuation of the temperature of the molten steel in bag maintains 10 DEG C；And the 2nd control portion, it is used for controlling
Speed adjustment portion processed so that the velocity deviation of casting speed is maintained ± 10% within.Thus, it is suppressed that in
Between molten steel in bag cool down because of heat radiation, suppressed sufficiently the variation of the temperature of molten steel in tundish.
Additionally, suppressed sufficiently the variation of the casting speed of strand.So, by reducing tundish fully
The amplitude of fluctuation of the temperature of interior molten steel and the variation of the casting speed of strand, it is possible to not coagulating of suppression strand
Gu the position on the top in portion changes.Thereby, it is possible to utilize simple apparatus structure with higher precision
Relative position relationship between top and the slighter compress portion in the portion that do not solidifies of maintenance strand consistently.Cause
And, it is possible to the most steadily and reliably play the slighter compress inhibitory action to center segregation.Its result,
Can be continuously manufactured by suppressed sufficiently the strand of the segregation at central part.
Can also be that above-mentioned continuous casting apparatus includes cooling end, this cooling end be configured to in casting
Between mould and slighter compress portion, the strand of circulation supplies the mixture of feedwater or water and air.
In the present invention, a kind of segregation can being adequately suppressed at central part can be provided in one aspect
The manufacture method of strand.The present invention can provide one can be adequately suppressed strand in yet another aspect
Central part at the continuous casting apparatus of segregation.
Accompanying drawing explanation
Fig. 1 is the figure of the embodiment representing the continuous casting apparatus manufacturing strand.
Fig. 2 is the flow chart of the method for adjustment representing the liquid steel temperature in tundish.
Fig. 3 is the flow chart of the method for adjustment of the casting speed representing strand.
Fig. 4 is the temperature of the molten steel in the tundish during manufacture method manufacture strand representing and utilizing the present invention
Figure with the rheological parameters' change with time of casting speed.
Fig. 5 is the temperature representing the molten steel utilizing conventional manufacture method to manufacture in tundish when strand manufactures
The figure of the rheological parameters' change with time of degree and casting speed.
Fig. 6 is the figure representing the sample collection location when segregation of the central part carrying out strand is evaluated.
Detailed description of the invention
One embodiment of the present invention is described referring to the drawings.But, implementation below is for saying
The example of the bright present invention, is not the purport limiting the invention to herein below.In explanation, to phase
With element or there is the element of identical function use identical reference, sometimes omit repeat specification.Separately
Outward, unless otherwise specified, the position relationship waited up and down is namely based on position shown in the drawings and closes
System.And, the dimension scale of accompanying drawing is not limited to the ratio of diagram.
Fig. 1 is the figure of an embodiment of the continuous casting apparatus representing present embodiment.Cast dress continuously
Putting 100 to include: casting ladle 102, it is filled molten steel 101；Tundish 105, it is located at casting ladle 102 times
Side, for accumulating the molten steel 101 of the bore having passed through casting ladle nozzle 103 from the bottom of casting ladle 102；Mold
104, it is located at the lower section of tundish 105；And strand support 110, it is located at the downstream of mold 104
Side.
Casting ladle 102 is configured in the way of can carrying the molten steel 101 utilizing process for making to obtain enter
Row is mobile.The molten steel utilizing process for making to obtain is sent in casting ladle 102.Fill up the molten steel 101 of casting ladle 102
Supply to tundish 105.By arranging multiple casting ladle 102, it is possible to from multiple casting ladle 102 (the 1st casting ladle and
2nd casting ladle) molten steel 101 is supplied successively to tundish 105.
Continuous casting apparatus 100 includes adding for the molten steel heating the molten steel 101 in tundish 105
Hot device 62 and for measuring the temperature detector 64 of the temperature of molten steel 101 in tundish 105.Molten steel heats
Device 62 makes to produce between plasma-arc molten steel 101 in plasma gun and tundish 105, thus adds
Hot molten steel 101.As plasma, such as, can use argon plasma.Molten steel heater 62 both can be
Utilize the plasma heater that molten steel 101 is heated by plasma, it is also possible to be that molten steel 101 is felt
The sensing heater that should heat.By arranging molten steel heater 62, even if thus reducing than ever from watering
Bag 102 is to the temperature of the molten steel 101 of tundish 105 supply, it is also possible to the obturation of suppression nozzle.
Plasma heater the most both can be single spraying gun-type, it is also possible to be double torch-type.In single spraying gun-type
In the case of, such as can be to be arranged in the spray gun on molten steel 101 as cathode electrode, to be embedded in structure
Becoming the iron plate in the refractory body of tundish 105 is that anode electrode is to produce plasma-arc.On the other hand,
In the case of double torch-type, such as can be respectively to be arranged in two spray guns on molten steel 101 as the moon
Pole electrode and anode electrode produce plasma-arc.
In tundish 105, set to improve the uniformity of the temperature of the molten steel 101 in tundish 105
There is weir portion 105a.As temperature detector 64, such as, can use radiation thermometer or sonde-type immersion-type
Thermometer etc..
The temperature information utilizing temperature detector 64 to detect is transfused to the 1st control portion 60.1st control portion 60
The letter relevant to the output of molten steel heater 62 is calculated according to the temperature information from temperature detector 64
Breath, the control carrying out plasma heater 62 according to result of calculation processes.1st control portion 60 can also have
Have CPU (Central Processing Unit: central processing unit), ROM (Read Only Memory:
Read only memory), RAM (Random Access Memory: random access memory) and input
Output interface etc..In the 1st control portion 60, it is also possible to storage has for according to from temperature detector 64
Temperature information set the function of output of molten steel heater 62.
Utilize the molten steel heater 62 controlled by the 1st control portion 60, by the molten steel 101 in tundish 105
Temperature T1(liquid steel temperature T1) amplitude of fluctuation maintain 10 DEG C within.So, in tundish 105
Liquid steel temperature T1Amplitude of fluctuation sufficiently small, even if the most not changing the casting speed of strand 10, it is also possible to
Make the position constant of the top 12a (wick-containing end) in the portion that do not solidifies 12 of strand 10.
Such as, the desired value of the temperature of the molten steel 101 in tundish 105 is set to T0In the case of, profit
Molten steel heater 62 is controlled, to maintain the state meeting following formula (1) with the 1st control portion 60.Desired value
T0Such as can be set to liquidus temperature that the composition according to molten steel obtains plus the temperature after 25 DEG C.Now
Desired value T0If representing by the degree of superheat, be then equivalent to 25 DEG C.By desired value T0It is set to 25 DEG C overheated
In the case of degree, temperature T of the molten steel 101 in tundish 1051(liquid steel temperature T1If) use degree of superheat table
Show, then maintain in the range of 20～30 DEG C.
-5 (DEG C)≤T0-T1≤+5(℃) (1)
Fig. 2 is the flow chart of the method for adjustment of the temperature representing the molten steel 101 in tundish 105.First,
According to the composition of molten steel, desired value T of the liquid steel temperature in setting tundish 1050.Then, bag is set
Containing desired value T0In interior target zone.The target zone of liquid steel temperature such as can be set to T0±4(℃)
Scope.So, as long as the target zone of liquid steel temperature is set in the scope less than formula (1),
Just can reliably meet above-mentioned formula (1), and by temperature T of molten steel 1011Amplitude of fluctuation be set to 10 DEG C
Within.After the target zone setting liquid steel temperature, use temperature detector 64, measure molten steel temperature
Degree T1.In the 1st control portion 60, to liquid steel temperature T1Whether judge in above-mentioned target zone.
At liquid steel temperature T1In the case of in above-mentioned target zone, the flow chart of Fig. 2 terminates.The opposing party
Face, at liquid steel temperature T1In the case of outside target zone, the output to molten steel heater 62 is adjusted.
Such as, at liquid steel temperature T1Less than lower limit [T0-4 (DEG C)] in the case of, improve molten steel heater
The output of 62, makes liquid steel temperature T1Rise.On the other hand, at liquid steel temperature T1Exceed higher limit [T0+4
(DEG C)] in the case of, reduce the output of molten steel heater 62, make liquid steel temperature T1Decline.By root
According to needing the method for adjustment that repeats shown in Fig. 2, it is possible to by liquid steel temperature T1Amplitude of fluctuation maintain
Within 10 DEG C.
Strand support 110 have make from mold 104 strand 10 of pull-out circulate downwards vertical section,
Rectification section that the strand 10 make bending section that strand 10 bends, making bending recovers and carrying to horizontal direction
The horizontal segment of strand 10.Vertical section, bending section and rectification section are respectively equipped with in a thickness direction
Across the strand backing roll 50 that the mode of strand 10 relatively and contacts with strand 10 at outer peripheral face.
Strand backing roll 50 has the rotary shaft of the width extension along strand 10, is configured to revolve
Turn while making strand 10 downstream side pass through.That is, logical with its rotary shaft and strand 10 of strand backing roll 50
Cross direction (pull-out direction) mode at a right angle to be fixed as along the circumferential direction rotating.
The horizontal segment of strand support 110 is provided with slighter compress portion 110a.Slighter compress portion 110a a pair
Slighter compress roller 30, about 30 is oppositely disposed across strand 10.It addition, a pair slighter compress roller 30,30 is also
Bending section can be located at or correct section.There is the slighter compress unit of a pair slighter compress roller 30,30 along strand
The length direction arrangement of 10 is provided with multiple.It is provided with 7 groups of slighter compress unit in FIG, but slighter compress unit
Quantity be not particularly limited.A pair slighter compress roller 30,30 connects with strand 10 at respective outer peripheral face
Touch.A pair slighter compress roller 30,30 has the width along strand 10 in the same manner as strand backing roll 50
The rotary shaft extended, rotates slighter compress strand 10.Slighter compress roller 30,30 is not shown by Fig. 1
Supporting member etc. can fix in the way of rotating.
The strand 10 the most only surface element solidification of pull-out from mold 104.Thus at the surface element of strand 10
Form so-called solidified shell 11.On the other hand, the inside at strand 10 has and is in not coagulating of molten condition
Gu portion 12.And, strand 10 along with on vertical section, bending section, rectification section and horizontal segment circulation and cold
But, solidified shell 11 grows.Along with the growth of solidified shell 11, do not solidify portion 12 and reduce, solidified shell 11
Thickness increases.
At the upstream side of slighter compress portion 110a, strand 10 has the portion of solidification 12 (fusing department) in inside.
By utilizing slighter compress roller 30,30 to carry out the slighter compress of strand 10, thus control the dense of the inside of strand 10
The flowing of contracting molten steel.Thereby, it is possible to reduce along with solidification and the surface element of strand 10 not solidifying portion 12
Contraction based on cooling and produce, the segregation of the central part of strand 10.That is, at slighter compress, pass through
Thickness direction along strand 10 presses containing concentrating the portion that do not solidifies 12 of molten steel to suppress segregation.
Slighter compress roller 30,30 at least one slighter compress unit can also be for adjusting drawing of strand 10
Go out pinch roll 30a, 30a of speed.In FIG, the slighter compress roller 30 in 3 groups of slighter compress unit is as folder
Tight roller 30a plays a role.The rotary shaft of pinch roll 30a is linked to motor 44.The load factor of motor 44 is by
2 control portions 40 control.Both can as in the present embodiment using slighter compress roller 30 as pinch roll 30a, also
Can using the roller different from slighter compress roller 30 in the upstream side being located at slighter compress portion 110a or downstream as
Pinch roll.
Continuous casting apparatus 100 has the casting speed for measuring strand in the downstream of slighter compress portion 110a
The measurement roller 70 of degree (pull-out speed).Speed detector 42 is had measuring to connect on roller 70.Velocity measuring
The tachometer that device 42 is configured to according to measuring roller 70 calculates casting speed.Speed detector 42 does not limit
Due to measuring roller 70.Can suitably use the structure of the casting speed that can measure strand 10.
Information from the casting speed of speed detector 42 is transfused to the 2nd control portion 40.2nd control portion 40
Information according to the casting speed from speed detector 42 calculates and the motor as speed adjustment portion
The information that the load factor of 44 is relevant.Then, the control process of motor 44 is carried out according to result of calculation.2nd
Control portion 40 can also have CPU (Central Processing Unit), ROM (Read Only
Memory), RAM (Random Access Memory) and input/output interface etc..In the 2nd control
In portion 40 processed, it is also possible to storage has for setting motor 44 according to the velocity information from speed detector 42
The function of load factor.
By utilizing the 2nd control portion 40 to control the casting speed of strand 10, it is possible to by casting speed
Velocity deviation maintains ± 10% within, manufacture strand 10.Here, velocity deviation refers to from casting
Reference value S of speed0The ratio of skew.In casting speed S being set to reality1In the case of, velocity deviation
Can calculate with following formula (2).
Velocity deviation (%)=(S1-S0)/S0×100 (2)
The control method of the casting speed of strand 10 is not limited to aforesaid way, it is also possible to by by multiple
The packet that pinch roll 30a packet is controlled controls the casting speed of strand 10.Thus, such as,
Even if producing slip between a pinch roll 30a and strand 10 and moment of torsion change, it is also possible to passing through
The casting speed utilizing another pinch roll 30a to control strand 10 reduces velocity deviation fully.
Fig. 3 is the flow chart of the method for adjustment of the casting speed representing strand 10.First, strand 10 is set
Reference value S of casting speed0.Then, setting comprises reference value S0In interior target zone.Casting speed
If the target zone of degree represents by above-mentioned velocity deviation, then can be set as such as ± 8%.As long as being set to
Such scope, it becomes possible to the velocity deviation utilizing above-mentioned formula (2) to calculate is set to ± 10% within.
Then, operating speed detector 42 measures the pull-out speed of strand 10, i.e. casting speed S1.In the 2nd control
In portion 40 processed, to casting speed S1Whether judge in above-mentioned target zone.
In casting speed S1In the case of in above-mentioned target zone, the flow chart of Fig. 3 terminates.The opposing party
Face, in casting speed S1In the case of outside target zone, bearing the motor 44 as speed adjustment portion
Load rate is adjusted.Such as, in casting speed S1In the case of lower limit (-8%), improve horse
Reach the load factor of 44, make casting speed S1Rise.On the other hand, in casting speed S1Exceed higher limit (+
8%), in the case of, reduce the load factor of motor 44, make casting speed S1Decline.By weighing as required
Carry out the method for adjustment shown in Fig. 3 again, even if thus between strand 10 and pinch roll 30a produce sliding,
It also is able to casting speed S1Velocity deviation maintain ± 10% within.
In continuous casting apparatus 100, due to by casting speed S1Velocity deviation maintain ± 10%
Within while manufacture strand, therefore, it is possible to be adequately suppressed the segregation of the center of strand 10.Casting speed
Reference value S0The e.g. desired value of casting speed or setting value.Such as, in reference value S0For 0.7m/
In the case of minute, the target zone of casting speed is such as set as 0.65m/ minute～0.75m/ minute.
In this case, casting speed S1Maintain in the range of 0.63m/ minute～0.77m/ minute.Reference value
S0Such as composition etc. according to molten steel suitably can set between 0.5m/ minute～0.9m/ minute.Base
From the viewpoint of reducing segregation further, casting speed S1Velocity deviation can also be within ± 5%.
The top 12a in the portion that do not solidifies 12 of strand 10 is positioned at slighter compress portion 110a.The casting of present embodiment
Casting speed S of base 101Velocity deviation minimum to less than ± 10%.And, suppressed sufficiently centre
The liquid steel temperature T of the molten steel 101 in bag 1051Variation.Thereby, it is possible to utilize simple apparatus structure with
Higher precision maintains between the top 12a in the portion that do not solidifies 12 of strand 10 and slighter compress portion 110a consistently
Relative position relationship.For instance, it is possible to the solid rate of the strand 10 in slighter compress portion 110a is maintained
In the range of 0.2～0.7.Thus, it is possible to the most reliably play the slighter compress suppression to center segregation
Effect.It is as a result, it is possible to manufacture the strand 10 that suppressed sufficiently the segregation at central part.
Continuous casting apparatus 100 has for the casting of circulation between mold 104 and slighter compress portion 110a
Base 10 is for feedwater or the cooling end 120 of the mixture of water and air.Cooling end 120 is at strand support
110 are configured to supply the mixture of feedwater or water and air to the surface of strand 10.Cooling end 120 is also
Can be there is common body, to raise the valve of the flow of rectification body at body and to body supply cooling
The parts of structure of fluid.Body can also be configured to spray water or water and air mixed
The two-fluid spray nozzle of compound.Two-fluid spray nozzle can also be the air water nozzle of air throttle cellular type.
By the water supplied from cooling end 120 or the cooling effect of mixture, promote the surface of strand 10
The cooling in portion.Thus, except the minimizing of segregation of inside of strand 10, additionally it is possible to reduce at strand 10
The crackle that surface produces.I.e., it is possible to manufacture and reduce the quality of the degree of depth of crackle and surface the most fully
The strand 10 that improve.The flow of water is the most often 0.1L～0.5L by the slab of 1kg.
The manufacture method of the strand of present embodiment can use has tundish 105, mold 104 and light
The continuous casting apparatus of depression 110a is carried out.The manufacture method of strand includes following operation: use steel
Within the amplitude of fluctuation of the temperature of the molten steel 101 in tundish 105 is maintained 10 DEG C by water heater 62, and
And the velocity deviation of casting speed is maintained ± 10% within, from mold 104, pull out strand 10 simultaneously.
In the case of using continuous casting apparatus 100 to carry out the manufacture method of strand, it is possible to according to above-mentioned continuously
The explanation of casting device 100 carries out above-mentioned operation.
Liquid steel temperature when Fig. 4 is to represent the manufacture method utilizing continuous casting apparatus 100 to carry out strand 10
T1With casting speed S1The figure of an example of rheological parameters' change with time.Figure 4 illustrates the steel in present embodiment
Coolant-temperature gage and the target zone of casting speed.As shown in Figure 4, liquid steel temperature T1Substantially including desired value
T0Elapse in the target zone of interior liquid steel temperature.Thus, liquid steel temperature T1The amplitude of fluctuation of temperature
Within maintaining 10 DEG C.It addition, casting speed S1Also constant it is maintained.Thus, casting speed S1
Velocity deviation become ± 10% within.So, by reducing liquid steel temperature T1Amplitude of fluctuation, and
Reduce casting speed S1Velocity deviation, it is possible to constant ground maintains the top in the portion that do not solidifies 12 of strand 10
Position relationship between end 12a and slighter compress portion 110a.Thus, it is possible to reduce fully in strand 10
Segregation at heart portion.
Molten steel temperature when Fig. 5 is to represent the manufacture method utilizing conventional continuous casting apparatus to carry out strand 10
Degree T1With casting speed S1The figure of an example of rheological parameters' change with time.In this manufacture method, at liquid steel temperature T1
In the case of changing, by changing casting speed S1Adjust liquid steel temperature T1.In Figure 5, for
Make liquid steel temperature and casting speed that the contrast transfiguration between Fig. 4 easily shows in present embodiment
Target zone.
Be not provided with in tundish in the conventional continuous casting apparatus of molten steel heater, carry out following so
Operation.In order to prevent from being reduced the obturation etc. of the casting nozzle caused by the temperature of the molten steel in tundish,
Molten steel in casting ladle (the 1st casting ladle) is supplied to tundish with the temperature higher than present embodiment.Here,
In the case of the temperature of molten steel is too high, in casting, in mold or when by guide reel, it is in
The insufficient tendency of growth of the solidified shell of strand.Therefore, bleed-out is (by coming that the breakage of solidified shell causes
From within strand molten steel flow out) probability raise.Therefore, casting speed S is reduced1, it is to avoid this
Phenomenon.By such operation, the temperature of molten steel reduces.And, if the temperature of molten steel is reduced to energy
Enough substantially ensure that the degree of the growth of solidified shell, then make casting speed S1Restore.
And then the 1st casting ladle, the 2nd casting ladle filling up the molten steel with sufficiently high temperature is transfused to cast continuously
Manufacturing apparatus.Molten steel maintains sufficiently high temperature while being supplied to tundish from the 2nd casting ladle.So,
Supply molten steel from casting ladle to tundish every time, all repeat and persistently produce liquid steel temperature T1Variation and and this
Casting speed S together1Variation.Therefore, in conventional continuous casting apparatus, it is impossible to reduce casting
Speed S1Velocity deviation.Casting speed S now1Velocity deviation exceeded 10%.And, molten steel
Temperature T1Amplitude of fluctuation also increase to 30 DEG C～about 50 DEG C.Its result, the portion that do not solidifies 12 of strand 10
Top 12a and slighter compress portion 110a between position relationship change continually.Thus, it is impossible to subtract
Segregation at the central part of few strand 10.
The manufacture method of the strand according to present embodiment, uses molten steel heater 62, it is suppressed that tundish
Molten steel 101 in 105 cools down because of heat radiation, by the liquid steel temperature T in tundish 1051Amplitude of fluctuation dimension
Hold within 10 DEG C.Additionally, by casting speed S of strand 101Velocity deviation maintained ± 10%
Within.So, by reducing amplitude of fluctuation and the strand of the temperature of the molten steel in tundish 105 fully
The velocity deviation of casting speed, it is possible to the position of the top 12a in the portion that do not solidifies of suppression strand 10 occurs
Variation.Thereby, it is possible to maintain consistently with higher precision the top 12a in the portion that do not solidifies of strand 10 with
Relative position relationship between slighter compress portion 110a.Thus, the most reliably play slighter compress centering
The inhibitory action of heart segregation.It is as a result, it is possible to manufacture the strand that suppressed sufficiently the segregation at central part
10。
The manufacture method of the strand of present embodiment can also include at mold 104 and slighter compress portion 110a
Between the operation of mixture of the water of strand 10 supply cooling of circulation or water and air.This operation energy
Enough mixture by spraying water or water and air from cooling end 120 to strand 10 are carried out.Thus,
The segregation of the center of strand can be adequately suppressed, and also be able to the crackle reducing on the surface of strand
Size.
Cooling end 120 can also be to be provided with the body for feedwater and be provided with air at the head of this body
The parts of the air water nozzle of throttling cellular type.Air water nozzle can also be provided with multiple, the sky of multiple air water nozzles
The bore of moral discharge orifice can also be different from each other.By adjusting the air capacity of each air water nozzle, it is possible to adjust
The amount of the mixture of the whole water from each air water nozzle and air.Thereby, it is possible to reduce water fully
Flow uneven, and the face crack of strand 10 can be made the most small.Thus, it is possible to easily
The ground higher-quality strand of manufacture requirements 10.
This concludes the description of the preferred embodiment of the present invention, but the present invention is not limited to above-mentioned enforcement
Mode.Such as, continuous casting apparatus can also not have cooling end 120.It addition, strand backing roll 50 He
The quantity of slighter compress roller 30 is also not particularly limited.Measure roller 70 and can also be located at the upper of slighter compress portion 110a
Trip side.1st control portion 60 both can be separately formed as hardware with the 2nd control portion 40, it is also possible to integrally structure
Become.
[embodiment]
Hereinafter, describing present disclosure in detail with reference to embodiment and comparative example, the present invention is not limited to
Following embodiment.
(manufacture example 1～manufacture example 7)
Use continuous casting apparatus as shown in Figure 1, carry out thickness and width be respectively 300mm and
The manufacture of the strand (molding bloom: Block Le system モ Le De) of 400mm.This continuous casting apparatus
There are 6 groups of slighter compress unit, as molten steel heater, there is plasma heater.While soaking with sonde-type
Liquid steel temperature T in stain type thermometer measure tundish1, carry out strand with predetermined casting speed
Manufacture.Desired value T by the temperature of the molten steel in tundish0It is set as 1555 DEG C (degrees of superheat: 25 DEG C).
Then, by adjusting the output of plasma heater, thus by liquid steel temperature T1Maintain 1555 DEG C ± 5
In the range of DEG C.That is, by liquid steel temperature T1Amplitude of fluctuation control within 10 DEG C.In all of manufacture
In example, use the cooling end with air water nozzle, to the strand of circulation between mold and slighter compress portion even
Continuously for the mixture of feedwater with air.The quantity delivered (specific water) of the water of every 1kg strand is set to 0.15L/
Minute.
Adjust the rotating speed of pinch roll, by reference value S of the casting speed of strand0It is set to 0.70m/ minute.So
After, change the rotating speed of pinch roll, by casting speed S of strand1It is set to as shown in table 1.Utilize and length
The vertical face cutting in direction is with each casting speed S1The strand obtained, obtains evaluation as shown in Figure 6 and uses
Sample.Fig. 6 represents the cutting plane of evaluation sample.In evaluation sample as shown in Figure 6, at diagonal angle
Drill bit is used at midpoint 20a, 20b, 20c, 20d between intersection point 20 and intersection point 20 and each summit of line
Gather sample.Burning infrared absorption is utilized to measure the concentration of carbon of each sample.
The concentration of carbon of the sample of intersection point 20 is set to C, by the sample of midpoint 20a, 20b, 20c, 20d
The meansigma methods of concentration of carbon is set to C0, obtain C/C0Value.The results are shown in " the center segregation of table 1
Evaluation " in hurdle.C/C0Value closer to 1, segregation more reduces.
(manufacture example 8～manufacture example 14)
Except desired value T by the liquid steel temperature in tundish0Be set to 1550 DEG C (degrees of superheat: 20 DEG C) with
Outward, carry out the manufacture of strand identically with manufacture example 1～manufacture example 7, carry out the analysis of sample.Result is such as
Shown in table 1.
(manufacture example 15～manufacture example 21)
Except desired value T by the liquid steel temperature in tundish0Be set to 1545 DEG C (degrees of superheat: 15 DEG C) with
Outward, carry out the manufacture of strand identically with manufacture example 1～manufacture example 7, carry out the analysis of sample.Result is such as
Shown in table 1.
(manufacture example 22～manufacture example 24)
Except desired value T by the temperature of the molten steel in tundish0With liquid steel temperature T1Amplitude of fluctuation become
Beyond the most as shown in table 1, carry out the manufacture of strand identically with manufacture example 3,5,2, carry out sample
Analyze.Result is as shown in table 1.
[table 1]
As shown in the embodiment of table 1, by by liquid steel temperature T1Amplitude of fluctuation be set to 10 DEG C within, and
And by casting speed S1Velocity deviation be set to ± 10% within, it is possible to be continuously manufactured by suppressed sufficiently
The strand of the segregation of the carbon at central part.It addition, in all manufacture examples (1～24) described in table 1,
In the method that the strand passed through between mold and slighter compress portion is cooled down, from having air water nozzle
Cooling end spray continuously and for giving the mixture of water and air.Its result, in all of embodiment
In, it is possible to reduce the degree of depth of face crack fully.
Claims (4)
1. a manufacture method for strand, its use has the continuous of tundish, mold and slighter compress portion
Casting device, wherein, the manufacture method of this strand includes following operation:
Use molten steel heater that the amplitude of fluctuation of the temperature of the molten steel in described tundish is maintained 10 DEG C
Within, and the velocity deviation of casting speed is maintained ± 10% within, draw from described mold simultaneously
Go out strand.
The manufacture method of strand the most according to claim 1, wherein,
The manufacture method of this strand includes following operation:
Supply feedwater or water with empty to the described strand of circulation between described mold and described slighter compress portion
The mixture of gas.
3. a continuous casting apparatus, it has tundish, mold and slighter compress portion, is used for manufacturing casting
Base, wherein, this continuous casting apparatus includes:
Temperature detector, it is for detecting the temperature of the molten steel in described tundish；
Molten steel heater, it is for heating described molten steel；
Speed detector, it is for detecting the casting speed of described strand；
Speed adjustment portion, it is used for adjusting described casting speed；
1st control portion, it is for controlling described molten steel heater with by the described molten steel in described tundish
The amplitude of fluctuation of temperature maintain 10 DEG C within；And
2nd control portion, it is for controlling described speed adjustment portion with the velocity deviation by described casting speed
Maintain ± 10% within.
Continuous casting apparatus the most according to claim 3, wherein,
This continuous casting apparatus also includes cooling end, and this cooling end is in described mold and described light pressure
Between bottom, the described strand of circulation supplies the mixture of feedwater or water and air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510149261.4A CN106141132A (en) | 2015-03-31 | 2015-03-31 | The manufacture method of strand and continuous casting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510149261.4A CN106141132A (en) | 2015-03-31 | 2015-03-31 | The manufacture method of strand and continuous casting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106141132A true CN106141132A (en) | 2016-11-23 |
Family
ID=57338121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510149261.4A Pending CN106141132A (en) | 2015-03-31 | 2015-03-31 | The manufacture method of strand and continuous casting apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106141132A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3533536A1 (en) * | 2018-02-28 | 2019-09-04 | Heraeus Electro-Nite International N.V. | Method and apparatus for monitoring a continuous steel casting process |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1280041A (en) * | 1999-07-06 | 2001-01-17 | Sms舒路曼-斯玛公司 | Method and device for measuring data to automatically operating contineous casting machine |
| CN1368908A (en) * | 1999-06-07 | 2002-09-11 | Sms迪马格股份公司 | Automation of high-speed continuous casting plant |
| CN101367121A (en) * | 2007-08-17 | 2009-02-18 | 鞍钢股份有限公司 | Near liquidus continuous casting method for electrical steel |
| CN101569922A (en) * | 2009-06-16 | 2009-11-04 | 承德建龙钢铁有限公司 | Continuous casting process of steel grades such as bearing steel and the like |
| CN101633038A (en) * | 2009-05-26 | 2010-01-27 | 山西太钢不锈钢股份有限公司 | Method for reducing surface defect of stainless steel continues casting blank |
| CN101708537A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Austenitic heat-resistant stainless steel continuous casting method |
| CN102534416A (en) * | 2012-01-05 | 2012-07-04 | 莱芜钢铁集团有限公司 | Steel for freight train connecting piece and preparation method thereof |
| CN104259413A (en) * | 2014-09-30 | 2015-01-07 | 江阴兴澄特种钢铁有限公司 | Continuous casting system and process producing large-specification elliptical billets |
| CN204584220U (en) * | 2015-03-31 | 2015-08-26 | 新日铁住金工程技术株式会社 | Continuous casting apparatus |
-
2015
- 2015-03-31 CN CN201510149261.4A patent/CN106141132A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1368908A (en) * | 1999-06-07 | 2002-09-11 | Sms迪马格股份公司 | Automation of high-speed continuous casting plant |
| CN1280041A (en) * | 1999-07-06 | 2001-01-17 | Sms舒路曼-斯玛公司 | Method and device for measuring data to automatically operating contineous casting machine |
| JP2001038456A (en) * | 1999-07-06 | 2001-02-13 | Sms Schloeman Siemag Ag | Method and device for guiding molten metal in continuous casting machine |
| US6539273B1 (en) * | 1999-07-06 | 2003-03-25 | Sms Schloemann-Siemag Ag | Method of and apparatus for automatically controlling operation of a continuous casting plant |
| CN101367121A (en) * | 2007-08-17 | 2009-02-18 | 鞍钢股份有限公司 | Near liquidus continuous casting method for electrical steel |
| CN101633038A (en) * | 2009-05-26 | 2010-01-27 | 山西太钢不锈钢股份有限公司 | Method for reducing surface defect of stainless steel continues casting blank |
| CN101569922A (en) * | 2009-06-16 | 2009-11-04 | 承德建龙钢铁有限公司 | Continuous casting process of steel grades such as bearing steel and the like |
| CN101708537A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Austenitic heat-resistant stainless steel continuous casting method |
| CN102534416A (en) * | 2012-01-05 | 2012-07-04 | 莱芜钢铁集团有限公司 | Steel for freight train connecting piece and preparation method thereof |
| CN104259413A (en) * | 2014-09-30 | 2015-01-07 | 江阴兴澄特种钢铁有限公司 | Continuous casting system and process producing large-specification elliptical billets |
| CN204584220U (en) * | 2015-03-31 | 2015-08-26 | 新日铁住金工程技术株式会社 | Continuous casting apparatus |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3533536A1 (en) * | 2018-02-28 | 2019-09-04 | Heraeus Electro-Nite International N.V. | Method and apparatus for monitoring a continuous steel casting process |
| WO2019166121A1 (en) * | 2018-02-28 | 2019-09-06 | Heraeus Electro-Nite International N.V. | Method and apparatus for monitoring a continuous steel casting process |
| CN111683766A (en) * | 2018-02-28 | 2020-09-18 | 贺利氏电测骑士国际有限公司 | Method and device for monitoring a continuous casting process |
| JP2021514851A (en) * | 2018-02-28 | 2021-06-17 | ヘレーウス エレクトロ−ナイト インターナシヨナル エヌ ヴイＨｅｒａｅｕｓ Ｅｌｅｃｔｒｏ−Ｎｉｔｅ Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｎ．Ｖ． | Methods and equipment for monitoring the continuous steel casting process |
| CN111683766B (en) * | 2018-02-28 | 2022-03-22 | 贺利氏电测骑士国际有限公司 | Method and device for monitoring a continuous casting process |
| JP7055213B2 (en) | 2018-02-28 | 2022-04-15 | ヘレーウス エレクトロ－ナイト インターナシヨナル エヌ ヴイ | Methods and equipment for monitoring the continuous steel casting process |
| US11673187B2 (en) | 2018-02-28 | 2023-06-13 | Heraeus Electro-Nite International N.V. | Method and apparatus for monitoring a continuous steel casting process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100409975C (en) | Method and device for determining the position of the solidification point in a casting billet during continuous casting of liquid metals, in particular liquid steel work materials | |
| JP4016297B2 (en) | Method and apparatus for adjusting roll crown of metal strip casting equipment | |
| CN104023875B (en) | Casting method, especially continuous cast method | |
| CN106077556A (en) | The solidification prediction of casting stream and control method in a kind of casting process secondary cooling zone | |
| KR101781805B1 (en) | Method for the continuous casting of metal strand | |
| CN113770318B (en) | Method and device for controlling casting force and roll gap of casting roll in thin strip continuous casting | |
| CN105798253B (en) | A kind of chilling roller of casting for shaped blank continuous two stitches method of adjustment | |
| CN107303601B (en) | Cooling monitoring system and method for casting blank | |
| CN204584220U (en) | Continuous casting apparatus | |
| KR101573666B1 (en) | Method for the continuous casting of a metal strand | |
| KR20190044704A (en) | Method for casting metal strip with dynamic crown control | |
| CN106141132A (en) | The manufacture method of strand and continuous casting apparatus | |
| JP5098394B2 (en) | Continuous casting slab manufacturing method, continuous casting machine | |
| US6539273B1 (en) | Method of and apparatus for automatically controlling operation of a continuous casting plant | |
| CN105945253B (en) | Gap preset method after bleed-out occurs for a kind of slab caster | |
| JP2012011460A (en) | Soft reduction method of cast slab in continuous casting | |
| CN109960835A (en) | The method for establishing continuous cast mold heat flux distribution model | |
| KR20120032917A (en) | Device for controlling cooling of strand and method therefor | |
| JP2009255127A (en) | Method and equipment for cooling of continuously cast slab | |
| WO2008043152A1 (en) | Casting steel strip | |
| KR20130088305A (en) | Reducing method of crack for addition of boron high-carbon steel | |
| Liu et al. | Dynamic water modeling and application of billet continuous casting | |
| CN112828252A (en) | Method for determining plasma heating position of tundish by using physical model | |
| KR101443585B1 (en) | Method for estimating clogging degree of submerged entry nozzle | |
| KR101320345B1 (en) | Device for measuring temperature of molten steel in tundish and method therefor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161123 |
|
| WD01 | Invention patent application deemed withdrawn after publication |