CN101850409A - Continuous casting method - Google Patents
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- CN101850409A CN101850409A CN 201010194746 CN201010194746A CN101850409A CN 101850409 A CN101850409 A CN 101850409A CN 201010194746 CN201010194746 CN 201010194746 CN 201010194746 A CN201010194746 A CN 201010194746A CN 101850409 A CN101850409 A CN 101850409A
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Abstract
The invention discloses a continuous casting method. The method performs drawing by using a drawing and straightening unit comprising a plurality of drawing and straightening machines, wherein the plurality of drawing and straightening machines are arranged so that a continuous casting billet successfully passes through each drawing and straightening machine. The method comprises the following steps of: keeping a dummy bar pressure pressed downwards through the drawing and straightening machine when a billet head of the continuous casting billet enters every one of the plurality of drawing and straightening machines; and converting the pressure applied by the first drawing and straightening machine in the plurality of drawing and straightening machines into a first hot billet pressure smaller than the dummy bar pressure through the dummy bar pressure before the billet head enters the last drawing and straightening machine in the plurality of drawing and straightening machines.
Description
Technical field
The present invention relates to a kind of continuous cast method, specifically, relate to a kind of continuous cast method that utilizes withdrawal straightening stands to improve the continuous casting billet recovery rate of iron.
Background technology
Continuous casting technology is one liquid metals is cast into the technology of the strand of certain section configuration continuously through one group of special cooling and bracing or strutting arrangement that its appearance has fundamentally changed the steel ingot-first roll process that has dominated since the century.Continuous casting steel machine and traditional mould annotate steel technology compare have the production process simplification, recovery rate of iron height, plurality of advantages such as energy resource consumption is low, automaticity is high, productivity ratio is high, slab quality is good, become one of important technology that has epoch-making property on the steel and iron industry developing history.
Continuous casting technology is exactly to have improved recovery rate of iron greatly than one of significant advantage of die casting technology.The crop of steel ingot cogging technology truncates with a toll of 10%-20%, and the loss of the cutting head cutting tail of continuous casting is 1%-2%, and recovery rate of iron has improved 10%-14% (slab 10.5%, bloom 13%, little square billet 14%).And higher strand recovery rate of iron also becomes one of pursuing one's goal of current continuous casting technology fast development.The strand recovery rate of iron is one of key factor that influences economic benefit, and the raising of strand recovery rate of iron has not only been saved resource and also brought huge economic benefit for producer.
In continuous casting production process, use the straightening machine to guide and align strand usually, the depressing cylinder pressure and can between dummy bar pressure and hot base pressure, change of straightening machine.General dummy bar pressure is 3MPa～10MPa, hot base pressure is then selected by cast section and strand temperature, when drawing hot base, non-slip and keep drafts＜1mm to be advisable during by the straightening machine with strand, usually, for square billet, hot base pressure is generally 2.5MPa～4MPa, for the circle base, hot base pressure is littler.Usually, dummy bar pressure is greater than hot base pressure.Here, hot base pressure (also can be described as strand pressure, throwing power etc.) is exactly that straightening machine system is applied to pressure on the strand, be used for casting process traction and aligning strand, production is carried out continuously, dummy bar pressure is exactly that straightening machine system is applied to pressure on the dummy bar, is used to open send dummy bar and open traction dummy bar when watering the back to deingot before watering.Both power sources provide by hydraulic system, have just adopted different pressure to regulate and control.
During the light section square-round billet continuous casting is produced, for guarantee to open water the process dummy bar and strand non-slip, before removing dummy bar, all adopt bigger dummy bar pressure, just be converted to hot base pressure together after having taken off dummy bar, cause being subjected to depressing greatly power effect distortion to taking off the ingot roller quite long one section strand from entering first pair of straightening machine.For guaranteeing product quality, this part strand can only excise to be scrapped, and causes than large economy and loses.In order further to improve recovery rate of iron, need reduce the length of the strand that is out of shape as much as possible, to reduce the cutting head cutting tail loss, improve recovery rate of iron.
Summary of the invention
In order to solve the aforementioned problems in the prior, the invention provides a kind of continuous cast method, this method utilization comprises that the withdrawal straightening stands of a plurality of straightening machines carries out throwing, wherein, described a plurality of straightening machine is set to make continuous casting billet sequentially by each straightening machine, this method may further comprise the steps: when the base head of continuous casting billet entered each straightening machine in described a plurality of straightening machine, this straightening machine still kept dummy bar pressure to depress; Before the base head entered last straightening machine in described a plurality of straightening machine, first straightening machine applied pressure in described a plurality of straightening machines was converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure.
According to one embodiment of present invention, described a plurality of straightening machines comprise n straightening machine, and when the base head marched between i straightening machine and the i+1 straightening machine, i straightening machine applied pressure was converted to the first hot base pressure by dummy bar pressure; By after the n straightening machine, n straightening machine applied pressure is converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure at the base head, and wherein, n is positive integer and n 〉=3, and i is positive integer and i≤n-1.
According to one embodiment of present invention, described a plurality of straightening machines comprise n straightening machine, and when the base head marched between i+1 straightening machine and the i+2 straightening machine, i straightening machine applied pressure was converted to the first hot base pressure by dummy bar pressure; By after the n straightening machine, n straightening machine and n-1 straightening machine applied pressure are converted to the first hot base pressure by dummy bar pressure at the base head, and wherein, n is positive integer and n 〉=3, and i is positive integer and i≤n-2.
According to one embodiment of present invention, by before the i+1 straightening machine, i straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure when the base head marches to after the i straightening machine 300mm to 500mm and at the base head; After the deingot bar was finished, n straightening machine applied pressure was converted to the first hot base pressure by dummy bar pressure.Continuous casting billet is a square billet.
According to one embodiment of present invention, by before the i+2 straightening machine, i straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure when the base head marches to after the i+1 straightening machine 300mm to 500mm and at the base head; After the deingot bar was finished, n straightening machine and n-1 straightening machine applied pressure were converted to the first hot base pressure by dummy bar pressure.Continuous casting billet is the circle base.
According to one embodiment of present invention, described withdrawal straightening stands also comprises the auxiliary straightening machine after the strand direction of motion is in described a plurality of straightening machine, after the base head of continuous casting billet was depressed with the first hot base pressure by auxiliary straightening machine and auxiliary straightening machine, described a plurality of straightening machines and auxiliary straightening machine applied pressure all were converted to the second hot base pressure less than the first hot base pressure.
Description of drawings
By the description of carrying out below in conjunction with accompanying drawing to embodiment, above-mentioned and/or other purposes of the present invention and advantage will become apparent, wherein:
Fig. 1 is the schematic diagram according to withdrawal straightening stands of the present invention;
Fig. 2 is the flow chart according to continuous cast method of the present invention.
The specific embodiment
Describe exemplary embodiment of the present invention below with reference to accompanying drawings in detail.Can realize method of the present invention by a kind of withdrawal straightening stands is provided.
Fig. 1 shows the schematic diagram according to withdrawal straightening stands of the present invention.With reference to Fig. 1, withdrawal straightening stands comprises the first straightening machine 100, the second straightening machine 200, the 3rd straightening machine 300 according to an embodiment of the invention.Wherein, the first straightening machine, 100 to the 3rd straightening machines 300 are set to make continuous casting billet 500 in turn by the first straightening machine 100, the second straightening machine 200 and the 3rd straightening machine 300.In addition, withdrawal straightening stands also can comprise auxiliary straightening machine 400, and auxiliary straightening machine 400 is arranged on the first straightening machine, 100 to the 3rd straightening machines, 300 rears, thereby makes continuous casting billet 500 pass through auxiliary straightening machine 400 after passing through the first straightening machine, 100 to the 3rd straightening machines 300.Filled arrows among Fig. 1 is represented the rotation direction of the roller of straightening machine, and hollow arrow is represented the direction of advance of continuous casting billet.
The first straightening machine 100 comprises: hydraulic cylinder 101 provides pressure by hydraulic system; The first straightening top roll 102 links to each other with hydraulic cylinder 101, is used for pressure is passed to continuous casting billet 500; The first straightening lower roll 103 is arranged on the position relative with the first straightening top roll 102, continuous casting billet 500 belows, with 102 common guiding of the first straightening top roll and aligning continuous casting billet 500.
The second straightening machine 200 comprises: hydraulic cylinder 201 provides pressure by hydraulic system; The first straightening top roll 202 links to each other with hydraulic cylinder 201, is used for pressure is passed to continuous casting billet 500; The first straightening lower roll 203 is arranged on the position relative with the first straightening top roll 202, continuous casting billet 500 belows, with 202 common guiding of the first straightening top roll and aligning continuous casting billet 500.
The 3rd straightening machine 300 comprises: hydraulic cylinder 301 provides pressure by hydraulic system; The first straightening top roll 302 links to each other with hydraulic cylinder 301, is used for pressure is passed to continuous casting billet 500; The first straightening lower roll 303 is arranged on the position relative with the first straightening top roll 302, continuous casting billet 500 belows, with 302 common guiding of the first straightening top roll and aligning continuous casting billet 500.
According to this exemplary embodiment, withdrawal straightening stands comprises 3 straightening machines and 1 auxiliary straightening machine.Yet the invention is not restricted to this,, can select to use more a plurality of straightening machines and/or more a plurality of auxiliary straightening machine according to factors such as the size of strand, shapes.
Withdrawal straightening stands according to the present invention can comprise a plurality of straightening machines except that auxiliary straightening machine.In this case, when beginning to cast, each straightening machine is all depressed with dummy bar pressure, and when the base head entered straightening machine in described a plurality of straightening machine, this straightening machine still kept dummy bar pressure to depress; In case the base head is stable by this straightening machine, this straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure.After the deingot bar was finished, last the straightening machine applied pressure in described a plurality of straightening machines was converted to the first hot base pressure by dummy bar pressure.After the base head was depressed with the first hot base pressure by auxiliary straightening machine and auxiliary straightening machine, described a plurality of straightening machines and auxiliary straightening machine can all be converted to the second hot base pressure.
Here,, stablize, make strand can continue to stablize state preceding and then that can not deform or skid by representing the base head by after this straightening machine certain distance for each straightening machine except last straightening machine in described a plurality of straightening machines; For last the straightening machine in described a plurality of straightening machines, stable by representing the state after the deingot bar is finished.
When strand is circle base the time, because the hot base pressure of circle base is less,, prevent that strand from skidding, so when needs wait the base head by the follow-up straightening machine in this straightening machine, just can guarantee stable this straightening machine that passes through of base head in order to guarantee enough throwing power.When strand is square billet, because the hot base pressure ratio of square billet circle base is big, so when the base head is by this straightening machine preset distance after and enter before the one straightening machine of back, can guarantee promptly that the base head is stablized passes through this straightening machine.Switch to hot base pressure in advance and help further to reduce the strand amount of scrapping, improve recovery rate of iron, so, before the straightening machine, this straightening machine applied pressure can be converted to the first hot base pressure by dummy bar pressure after the base head is by straightening machine preset distance and after entering for square billet.
Therefore, in an embodiment of the present invention, the base head is before passing through last straightening machine, and the first straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure, thereby can reduce to declare owing to the excessive distortion that causes of dummy bar pressure the length of useless continuous casting billet.
For common square-round billet continuous casting machine, dummy bar pressure is generally 3MPa to 10MPa, and hot base pressure is relevant with factors such as casting machine form, casting section and steel grades.With certain manufacturer's round billet continuous casting machine is example, and the first hot base pressure is: Φ 200mm circle base is 0.9MPa, and 200mm * 200mm square billet is 3.5MPa; The second hot base pressure is: Φ 200mm circle base is 0.5～0.9MPa, and 200mm * 200mm square billet is 2.5～3.5MPa.In the method according to the invention, the second hot base pressure is usually less than the first hot base pressure, and the first hot base pressure and the second hot base pressure are all less than dummy bar pressure.This is because after continuous casting billet is by auxiliary straightening machine, the straightening machine that applies throwing power to strand increases, so each straightening machine can use littler pressure to carry out throwing, thereby under the situation that guarantees enough throwing power, reduce casting blank deformation as far as possible, improve slab quality.
According to the first embodiment of the present invention, continuous casting billet 500 is circle bases.In this case, when the base head of continuous casting billet 500 entered the first straightening machine 100, the first straightening machine 100 still kept dummy bar pressure to depress, to guarantee that withdrawal straightening stands provides enough pulling force to continuous casting billet 500.When the base head enters the second straightening machine 200, the second straightening machine still keeps dummy bar pressure to depress, when base head during by the second straightening machine, 200 preset distances and before entering the 3rd straightening machine, the first straightening machine, 100 applied pressures are converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure.Then, when the base head enters the 3rd straightening machine 300 when carrying out the deingot bar, the 3rd straightening machine 300 still keeps dummy bar pressure to depress.After the deingot bar was finished, the second straightening machine 200 and the 3rd straightening machine 300 applied pressures were converted to the first hot base pressure by dummy bar pressure.At last, after the base head was depressed with the first hot base pressure by auxiliary straightening machine 400 and auxiliary straightening machine 400, the first straightening machine, 100 to the 3rd straightening machines 300 and auxiliary straightening machine 400 applied pressures were converted to the second hot base pressure less than the first hot base pressure and dummy bar pressure from the first hot base pressure.
According to first embodiment, when continuous casting billet 500 is that diameter is when being the round base of 200mm, after a back straightening machine 300mm to 500mm of a certain straightening machine of base head by removing last straightening machine and before entering the follow-up straightening machine of this back straightening machine, can guarantee that the base head stably passes through this straightening machine.When described straightening machine is last straightening machine, then after the deingot bar is finished, can guarantee that the base head is stably by last straightening machine.Therefore, in this case, when the base head passed through the second straightening machine 300mm to 500mm, the first straightening machine, 100 applied pressures were converted to the first hot base pressure by dummy bar pressure; After the deingot bar was finished, the second straightening machine 200 and the 3rd straightening machine 300 applied pressures were converted to the first hot base pressure by dummy bar pressure.
Here having described diameter is the straightening operation that the round base of 200mm carries out, yet for different continuous casting billets, can select various criterion to judge whether the base head has stably passed through a certain straightening machine as the case may be, thereby judge whether this straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure.
According to a second embodiment of the present invention, continuous casting billet 500 is square billets.In this case, when the base head of continuous casting billet 500 entered the first straightening machine 100, the first straightening machine 100 still kept dummy bar pressure to depress, to guarantee that withdrawal straightening stands provides enough pulling force to continuous casting billet 500.When base head during through the first straightening machine, 100 preset distances and before entering the second straightening machine 200, the first straightening machine, 100 applied pressures are converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure.When the base head entered the second straightening machine 200, the second straightening machine 200 still kept dummy bar pressure to depress.When base head during by the second straightening machine, 200 preset distances and before entering the 3rd straightening machine 300, the second straightening machine, 200 applied pressures are converted to the first hot base pressure by dummy bar pressure.Then, when the base head enters the 3rd straightening machine 300 when carrying out the deingot bar, the 3rd straightening machine 300 still keeps dummy bar pressure to depress.After the deingot bar was finished, the 3rd straightening machine 300 applied pressures were converted to the first hot base pressure by dummy bar pressure.At last, after the base head was depressed with the first hot base pressure by auxiliary straightening machine 400 and auxiliary straightening machine 400, the first straightening machine, 100 to the 3rd straightening machines 300 and auxiliary straightening machine 400 were converted to the second hot base pressure less than the first hot base pressure from the first hot base pressure.
According to second embodiment, when continuous casting billet 500 is that the section length of side is when being the square billet of 200mm, before the straightening machine, can guarantee that the base head is stably by this straightening machine after the base head is by a certain straightening machine 300mm to 500mm except that last straightening machine and after entering.When described straightening machine is last straightening machine, then after the deingot bar is finished, can guarantee that the base head is stably by last straightening machine.Therefore, in this case, when the base head when the first straightening machine 300mm to 500mm, the first straightening machine, 100 applied pressures are converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure; When the base head when the second straightening machine 300mm to 500mm, the second straightening machine, 200 applied pressures are converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure; After the deingot bar was finished, the 3rd straightening machine 300 applied pressures were converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure.
Here having described the section length of side is the straightening operation that the square billet of 200mm carries out, yet for different continuous casting billets, can select various criterion to judge whether the base head has stably passed through a certain straightening machine as the case may be, thereby judge whether this straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure.
Continuous cast method of the present invention can reduce the cutting head cutting tail loss significantly, that is, can shorten casting blank deformation and declare useless length.Usually, declaring useless length is to stand the length of the continuous casting billet of dummy bar pressure.For example, according to traditional continuous cast method, have at withdrawal straightening stands under the situation of three straightening machines, strand is converted to first hot base pressure less than dummy bar pressure with three straightening machine applied pressures by dummy bar pressure by the 3rd straightening machine and deingot bar are disposable after finishing, and declares useless length this moment and is distance between the first straightening machine to the, the three straightening machines and add that base head before the switching to pressure leaves the distance of the 3rd straightening machine.And according to continuous cast method of the present invention, have under the situation of three straightening machines at withdrawal straightening stands equally, stable during by a certain straightening machine and before the base head enters last straightening machine in the withdrawal straightening stands when the base head of strand, described a certain straightening machine applied pressure is converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure.This shows, because by last straightening machine (promptly at the base head, the 3rd straightening machine) before, the first straightening machine applied pressure is converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure, therefore can shorten the length of the continuous casting billet that stands dummy bar pressure, thereby useless length is declared in the distortion that can shorten strand.
Though in the process of describing according to withdrawal straightening stands of the present invention, described continuous cast method, for the sake of clarity, will describe continuous cast method in detail hereinafter.Hereinafter, for the sake of brevity, will omit the term of repetition and the detailed description of parts.
Fig. 2 be according in the continuous cast method of the present invention to the flow chart of the method for operating of a straightening machine in the withdrawal straightening stands.
Method of operating among Fig. 2 can be applicable to each straightening machine except that auxiliary straightening machine in the withdrawal straightening stands.With reference to Fig. 2, at first, when beginning to cast, current straightening machine is depressed with dummy bar pressure.Then, judge whether continuous casting billet base head is stable by current straightening machine.If continuous casting billet base head is also unstable by current straightening machine, then current straightening machine continues to depress with dummy bar pressure; If continuous casting billet base head is stable by current straightening machine, then controls current straightening machine applied pressure and be converted to the first hot base pressure, and lastingly depress with the first hot base pressure less than dummy bar pressure by dummy bar pressure.Then, judge whether continuous casting billet base head is depressed with the first hot base pressure by auxiliary straightening machine and auxiliary straightening machine.If continuous casting billet base head is not also depressed with the first hot base pressure by auxiliary straightening machine and auxiliary straightening machine, then current straightening machine continues to depress with the first hot base pressure; If continuous casting billet base head is depressed with the first hot base pressure by auxiliary straightening machine and auxiliary straightening machine, then current straightening machine applied pressure is converted to the second hot base pressure less than the first hot base pressure by the first hot base pressure, and continues to depress with the second hot base pressure.Here, if described straightening machine is not last straightening machine except that auxiliary straightening machine in the withdrawal straightening stands, then stable by expression base head by after this straightening machine certain distance and at the base head by before removing last the straightening machine the auxiliary straightening machine, make strand can continue the stable preceding and then state that can not deform or skid; If it is described straightening machine is last straightening machine except that auxiliary straightening machine in the withdrawal straightening stands, then stable by representing the state after the deingot bar is finished.
Therefore, according to exemplary embodiment of the present invention, withdrawal straightening stands has the individual straightening machine of n (n is positive integer and n 〉=3).According to an aspect of the present invention, (i is between straightening machine of positive integer and i≤n-1) and the i+1 straightening machine time, and i straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure to march to i at the base head; By after the n straightening machine, n straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure at the base head.For example, by before the i+1 straightening machine, i straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure when the base head marches to after the i straightening machine 300mm to 500mm and at the base head; After the deingot bar was finished, n straightening machine applied pressure was converted to the first hot base pressure by dummy bar pressure.According to a further aspect in the invention, when the base head marched between k+1 straightening machine and the k+2 straightening machine, k straightening machine applied pressure was converted to the first hot base pressure by dummy bar pressure; By after the n straightening machine, n straightening machine and n-1 straightening machine applied pressure are converted to the first hot base pressure by dummy bar pressure at the base head, and wherein, k is positive integer and k≤n-2.For example, by before the k+2 straightening machine, k straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure when the base head marches to after the k+1 straightening machine 300mm to 500mm and at the base head; After the deingot bar was finished, n straightening machine and n-1 straightening machine applied pressure were converted to the first hot base pressure by dummy bar pressure.It should be understood that the continuous casting billet for different size and cross sectional shape, stable condition by a certain continuous casting billet can be different.
Though described the present invention with reference to embodiment, it should be appreciated by those skilled in the art that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications and change to these embodiment.Scope of the present invention is limited by claims and equivalent thereof.
Claims (8)
1. continuous cast method, this method utilization comprises that the withdrawal straightening stands of a plurality of straightening machines carries out throwing, and wherein, described a plurality of straightening machines are set to make continuous casting billet sequentially by each straightening machine, and this method may further comprise the steps:
When the base head of continuous casting billet entered each straightening machine in described a plurality of straightening machine, this straightening machine still kept dummy bar pressure to depress;
Before the base head entered last straightening machine in described a plurality of straightening machine, first straightening machine applied pressure in described a plurality of straightening machines was converted to the first hot base pressure less than dummy bar pressure by dummy bar pressure.
2. continuous cast method as claimed in claim 1, wherein, described a plurality of straightening machines comprise n straightening machine,
When the base head marched between i straightening machine and the i+1 straightening machine, i straightening machine applied pressure was converted to the first hot base pressure by dummy bar pressure;
By after the n straightening machine, n straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure at the base head,
Wherein n is positive integer and n 〉=3, and i is positive integer and i≤n-1.
3. continuous cast method as claimed in claim 1, wherein, described a plurality of straightening machines comprise n straightening machine,
When the base head marched between i+1 straightening machine and the i+2 straightening machine, i straightening machine applied pressure was converted to the first hot base pressure by dummy bar pressure;
By after the n straightening machine, n straightening machine and n-1 straightening machine applied pressure are converted to the first hot base pressure by dummy bar pressure at the base head,
Wherein n is positive integer and n 〉=3, and i is positive integer and i≤n-2.
4. continuous cast method as claimed in claim 2, wherein,
By before the i+1 straightening machine, i straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure when the base head marches to after the i straightening machine 300mm to 500mm and at the base head;
After the deingot bar was finished, n straightening machine applied pressure was converted to the first hot base pressure by dummy bar pressure.
5. continuous cast method as claimed in claim 4, wherein, continuous casting billet is a square billet.
6. continuous cast method as claimed in claim 3, wherein,
By before the i+2 straightening machine, i straightening machine applied pressure is converted to the first hot base pressure by dummy bar pressure when the base head marches to after the i+1 straightening machine 300mm to 500mm and at the base head;
After the deingot bar was finished, n straightening machine and n-1 straightening machine applied pressure were converted to the first hot base pressure by dummy bar pressure.
7. continuous cast method as claimed in claim 6, wherein, continuous casting billet is the circle base.
8. continuous cast method as claimed in claim 1, wherein, described withdrawal straightening stands also comprises the auxiliary straightening machine after the strand direction of motion is in described a plurality of straightening machine, after the base head of continuous casting billet was depressed with the first hot base pressure by auxiliary straightening machine and auxiliary straightening machine, described a plurality of straightening machines and auxiliary straightening machine applied pressure all were converted to the second hot base pressure less than the first hot base pressure.
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| CN102825235A (en) * | 2012-09-26 | 2012-12-19 | 石家庄华海冶金科技有限公司 | Continuous-casting flexible dummy bar control method without utilizing encoder |
| CN102847902A (en) * | 2011-06-28 | 2013-01-02 | 上海梅山钢铁股份有限公司 | Double-casting coexistence control method for efficient continuous casting machine with dummy bar |
| CN109332617A (en) * | 2018-12-24 | 2019-02-15 | 湖北新冶钢特种钢管有限公司 | Conticaster dummy ingot method, conticaster chain dumming bar and conticaster system |
| CN113399632A (en) * | 2021-06-24 | 2021-09-17 | 重庆钢铁股份有限公司 | Process for preventing billet head bending during casting or recasting of continuous casting square billet |
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| CN102847902A (en) * | 2011-06-28 | 2013-01-02 | 上海梅山钢铁股份有限公司 | Double-casting coexistence control method for efficient continuous casting machine with dummy bar |
| CN102847902B (en) * | 2011-06-28 | 2014-07-09 | 上海梅山钢铁股份有限公司 | Double-casting coexistence control method for efficient continuous casting machine with dummy bar |
| CN102825235A (en) * | 2012-09-26 | 2012-12-19 | 石家庄华海冶金科技有限公司 | Continuous-casting flexible dummy bar control method without utilizing encoder |
| CN102825235B (en) * | 2012-09-26 | 2014-05-07 | 石家庄华海冶金科技有限公司 | Continuous-casting flexible dummy bar control method without utilizing encoder |
| CN109332617A (en) * | 2018-12-24 | 2019-02-15 | 湖北新冶钢特种钢管有限公司 | Conticaster dummy ingot method, conticaster chain dumming bar and conticaster system |
| CN109332617B (en) * | 2018-12-24 | 2024-02-06 | 大冶特殊钢有限公司 | Continuous casting machine dummy ingot method, continuous casting machine chain dummy ingot bar and continuous casting machine system |
| CN113399632A (en) * | 2021-06-24 | 2021-09-17 | 重庆钢铁股份有限公司 | Process for preventing billet head bending during casting or recasting of continuous casting square billet |
Also Published As
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|---|---|
| CN101850409B (en) | 2012-02-29 |
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