CN113804482A - Method for rapidly detecting solidification tail end position of continuous casting billet - Google Patents
Method for rapidly detecting solidification tail end position of continuous casting billet Download PDFInfo
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- CN113804482A CN113804482A CN202111080607.1A CN202111080607A CN113804482A CN 113804482 A CN113804482 A CN 113804482A CN 202111080607 A CN202111080607 A CN 202111080607A CN 113804482 A CN113804482 A CN 113804482A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a method for rapidly detecting the solidification tail end position of a continuous casting billet, which is applied to the technical field of continuous casting billet production processes, and comprises the following detection steps: a roller (2) of the withdrawal and straightening machine (1) applies pressure in the direction of the inner arc and the outer arc of the continuous casting billet; cutting off the pressed samples (3) respectively, and dissecting the pressed samples (3); cutting open the plurality of pressing samples (3), turning and grinding the cut surfaces, and then soaking the pressing samples (3) in a pickling tank; according to the method for rapidly detecting the solidification tail end position of the continuous casting billet, the continuous casting withdrawal and straightening machine is used for applying certain pressure to the continuous casting billet, so that the solidification tail end position of the continuous casting billet can be rapidly and accurately judged, meanwhile, personnel do not need to be close to high-temperature molten steel/continuous casting billet in a short distance, extra investment and equipment transformation do not need to be increased, the operability is strong, the process flow is simple, and the detection accuracy is high.
Description
Technical Field
The invention belongs to the technical field of continuous casting billet production processes, and particularly relates to a method for rapidly detecting a solidification tail end position of a continuous casting billet.
Background
The production process flow of the continuous casting machine comprises the steps of injecting molten steel into a tundish, distributing the molten steel into the crystallizers of each flow, enabling the molten steel to be rapidly solidified through the crystallizers to form solid blank shells, then entering a secondary cooling area of the continuous casting machine to be continuously cooled, gradually thickening the solid blank shells, cutting after the liquid molten steel is completely solidified, and flowing into a stack to a next procedure. The position where the liquid molten steel is to be completely solidified (or the position where the liquid molten steel is completely viscous) is called the solidification tail end position of the continuous casting slab. Generally, the position of the solidification end of the continuous casting billet is not only one of main bases of early design stages such as continuous casting equipment design and continuous casting process parameter determination, but also one of main parameters in aspects of continuous casting production control, casting billet internal structure, casting billet quality control and the like in the actual production process, so that the accurate detection of the position of the solidification end of the continuous casting billet has a very important role. At present, most domestic steel mills adopt methods such as an online casting blank nail injection method, an online pouring tracer method, a theoretical model measurement algorithm and the like to detect the solidification tail end of a continuous casting blank, and the former two methods have the defects that: 1) the operation area of the operator is close to the high-temperature molten steel/continuous casting billet, so that the safety coefficient is low and the danger is high; 2) the used raw materials (such as nail guns, steel nails and tracers) are mostly national safety control articles and are difficult to transport and purchase. The latter method has the following disadvantages: the factors influenced by the outside are more, and the result accuracy is poorer. Therefore, the problem of detecting the solidification tail end position of the continuous casting billet is not effectively solved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: to prior art's not enough, provide one kind and guaranteeing under the conticaster normal production condition, utilize the conticaster to draw the leveler to apply certain pressure to the continuous casting billet, make the continuous casting billet take place to warp, then carry out the analysis to the continuous casting billet to can the solidification end position of quick accurate judgement continuous casting billet, ensure simultaneously that personnel need not closely be close to high temperature molten steel/continuous casting billet, need not to increase extra investment and equipment transformation, maneuverability is strong, process flow is simple, detect the high method of the continuous casting billet solidification end position of accuracy.
To solve the technical problems, the invention adopts the technical scheme that:
the invention relates to a method for rapidly detecting the solidification tail end position of a continuous casting billet, which comprises the following detection steps:
s1, a withdrawal and straightening machine comprises a plurality of rollers, the rollers of the withdrawal and straightening machine sequentially press down a continuous casting billet, and the rollers apply pressure in the inner and outer arc directions of the continuous casting billet during pressing down;
s2, cutting the continuous casting blanks pressed by each roller respectively to take down the pressed samples, and dissecting the pressed samples in a mode of splitting the inner arc surfaces of the pressed samples along the length direction;
s3, cutting open a plurality of pressing samples, turning and grinding the cut surfaces, and then placing the turned and ground pressing samples in a pickling tank for soaking;
s4, taking out the sample after the sample is pressed down and soaked, washing and drying the sample, and taking a sample 4 which is not pressed down as a comparison sample;
s5, different rolling samples formed by rolling different rollers are respectively compared with non-rolling samples, and if the fact that the level of a central shrinkage cavity in the rolling sample formed by rolling a certain roller of the rolling samples is reduced and the V-shaped segregation width is not obviously reduced is found, the fact that the solidification tail end of the continuous casting billet is behind the corresponding position of the roller is proved; if the V-shaped segregation width in a pressed sample formed by a certain roller is obviously reduced and the central shrinkage cavity grade is not obviously reduced, the solidification tail end position is proved to be behind the corresponding position of the roller; based on the above changes, the solidification end position of the slab on the slab is estimated.
To ensure data accuracy, the above detection steps are repeated 1-2 times.
The rollers of the withdrawal and straightening unit comprise a 1# roller, a 2# roller, a 3# roller and a 4# roller, and the 1# roller, the 2# roller, the 3# roller and the 4# roller are arranged according to gaps.
When the continuous casting machine is normally produced, the 1# roller is pressed down, other rollers are lifted, the rollers are lifted up after the 1# roller is pressed down, and the sample is pressed down at the position; after the sample is taken, the 2# roller is pressed down, other rollers are lifted, after the 2# roller is pressed down, the other rollers are lifted up, and the sample is pressed down at the position; after the sample is taken, the 3# roller is pressed down, other rollers are lifted, after the 3# roller is pressed down, the other rollers are lifted up, and the sample is pressed down at the position; after the sample is taken, the roller No. 4 is pressed down, other rollers are lifted, and after the roller No. 4 is pressed down, the other rollers are lifted up, and the sample is pressed down at the position.
When each roller of the withdrawal and straightening machine is reduced, the continuous casting billet is deformed in the circumferential direction, wherein the size deformation ratio of the inner arc direction and the outer arc direction of the continuous casting billet (the ratio of the size of the casting billet after reduction to the size of the casting billet before reduction) is controlled to be 88-91%.
Pressing the sample, after the sample is dissected, placing the sample in a pickling tank for soaking, wherein the solution in the pickling tank is hydrochloric acid with the concentration of 1:1, the temperature of the solution is 60-80 ℃, and the soaking time is more than 30 min.
After the reduction is carried out by adopting the method for rapidly detecting the solidification tail end position of the continuous casting billet, if the corresponding reduced sample is cut open after the 1# roller is reduced and the state that the central porosity grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm is presented after acid washing, the continuous casting billet liquid core is proved to be certainly behind the 1# roller; and (3) continuing adopting the 2# roller for pressing, and if the corresponding pressed sample after the 2# roller is pressed is cut open and shows a state that the central porosity grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm after acid washing, proving that the liquid core of the continuous casting billet is still behind the 2# roller, and the like.
If the pressing sample corresponding to the 1# roller is cut open and shows a state that the central porosity grade is less than or equal to 1.0 grade and the V-type segregation width is more than or equal to 50mm after acid washing, and the pressing sample corresponding to the 2# roller is cut open and shows a state that the central shrinkage cavity grade is more than 1 grade and the V-type segregation width is less than 50mm after acid washing, the solidification tail end of the continuous casting billet is proved to be between the 1# roller and the 2# roller; and if the section of the corresponding pressed sample is cut under the condition of 2# pressing, the central porosity grade is less than or equal to 1.0 grade after acid washing, and the V-type segregation width is more than or equal to 50mm, the section of the corresponding pressed sample is cut under the condition of 3# roller pressing, the central shrinkage cavity grade is more than 1 grade after acid washing, and the V-type segregation width is less than 50mm, the solidification tail end of the continuous casting billet is proved to be between the 2# roller and the 3# roller, and the like.
If the 1# roller is subjected to reduction to form a reduced sample which is cut open and pickled and then shows a state that the central shrinkage cavity grade is more than 1 grade and the V-type segregation width is less than 50mm, the situation that the solidification tail end of the continuous casting billet is in front of the 1# roller is proved that the position of the solidification tail end cannot be accurately judged under the situation, and for the situation, technological parameters of a continuous casting machine are adjusted, such as the casting speed of the continuous casting machine is increased or the cooling intensity of the continuous casting billet is reduced, the position of the solidification tail end of the continuous casting billet is prolonged, and detection is carried out again according to the steps after the situation is prolonged.
If the 4# roller is subjected to reduction to form a reduced sample which is cut open and pickled and then shows a state that the central shrinkage cavity grade is more than 1 grade and the V-type segregation width is less than 50mm, the situation proves that the solidification tail end of the continuous casting billet is behind the 4# roller, the position of the solidification tail end cannot be accurately judged under the situation, and for the situation, technological parameters of a continuous casting machine are adjusted, such as the continuous casting speed is reduced or the cooling strength of the continuous casting billet is enhanced, the position of the solidification tail end of the continuous casting billet is shortened, and the detection is carried out again according to the steps after the shortening.
By adopting the technical scheme of the invention, the following beneficial effects can be obtained:
the invention provides a brand-new technical scheme based on an ingenious concept aiming at the defects in the prior art. The detection method of the invention provides a brand-new method for detecting the solidification tail end position of the casting blank under a conventional production mode (without additional investment), namely, under the normal production condition of a continuous casting machine, a withdrawal straightening machine device of the continuous casting machine is used for applying certain pressure to the square/rectangular continuous casting blank to deform the continuous casting blank. And analyzing the continuous casting billet so as to judge the solidification tail end position of the continuous casting billet. The advantages are that: 1) personnel do not need to approach the high-temperature molten steel/continuous casting billet in a close range; 2) extra investment and equipment transformation are not required; 3) the operability is strong, the process flow is simple, and the detection accuracy is high. According to the method, under the normal production condition of the continuous casting machine, the existing withdrawal and straightening machine device is used for judging the solidification tail end of the casting blank, so that the method has the advantages of no need of adding extra investment and equipment transformation, no need of close approach of personnel to high-temperature molten steel/continuous casting blank, strong operability, simple process flow, higher detection accuracy and the like, and effectively avoids the defects of the traditional technology for detecting the solidification tail end of the continuous casting blank.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic structural view of a withdrawal and straightening machine according to the present invention;
FIG. 2 is a schematic view of a structure of a press-down sample of the withdrawal and straightening unit according to the present invention;
FIG. 3 is a schematic structural view of a press-down sample of the withdrawal and straightening unit according to the present invention when it is sectioned (in a longitudinal section);
FIG. 4 is a schematic structural diagram of an unpressed sample of the withdrawal and straightening unit according to the present invention;
in the drawings, the reference numbers are respectively: 1. a withdrawal and straightening machine; 2. a roller; 3. pressing down the sample; 4. the sample is not pressed; 5. a # 1 roller; 6. a # 2 roller; 7. a 3# roller; 8. and 4# roller.
Detailed Description
The following detailed description of the embodiments of the present invention, such as the shapes and structures of the components, the mutual positions and connection relations among the components, the functions and operation principles of the components, will be made by referring to the accompanying drawings and the description of the embodiments:
as shown in the attached drawings 1-4, the invention relates to a method for rapidly detecting the solidification tail end position of a continuous casting billet, which comprises the following detection steps: s1, a withdrawal and straightening machine 1 comprises a plurality of rollers 2, the rollers 2 of the withdrawal and straightening machine 1 sequentially press down a continuous casting billet, and the rollers 2 apply pressure in the inner and outer arc directions of the continuous casting billet during pressing down; s2, cutting the continuous casting blanks pressed by each roller 2 respectively to take down the pressed samples 3, and dissecting the pressed samples 3 in a mode of dissecting the intrados of the pressed samples 3 along the length direction; s3, cutting open a plurality of pressing samples 3, turning and grinding the cut surfaces, and then soaking the turned and ground pressing samples 3 in a pickling tank; s4, pressing the sample 3, taking out after soaking, washing, drying, and taking a sample 4 which is not pressed as a comparison sample; s5, different rolling samples 3 formed by rolling down different rollers 2 are respectively compared with non-rolling samples 4, and if the fact that the level of the central shrinkage cavity in the rolling sample 3 formed by rolling down one roller 2 of the rolling samples 3 is reduced and the V-shaped segregation width is not obviously reduced is found, the fact that the solidification tail end of the continuous casting billet is behind the corresponding position of the roller 2 is proved; if the V-shaped segregation width in the pressed sample 3 formed by pressing a certain roller 2 is obviously reduced and the reduction of the central shrinkage cavity grade is not obvious, the solidification tail end position is proved to be behind the corresponding position of the roller 2; based on the above changes, the solidification end position of the slab on the slab is estimated. To ensure data accuracy, the above detection steps are repeated 1-2 times. The steps are based on ingenious conception and provide a brand-new technical scheme aiming at the defects in the prior art. The detection method of the invention provides a brand-new method for detecting the solidification tail end position of the casting blank under a conventional production mode (without additional investment), namely, under the normal production condition of a continuous casting machine, a withdrawal straightening machine device of the continuous casting machine is used for applying certain pressure to the square/rectangular continuous casting blank to deform the continuous casting blank. And analyzing the continuous casting billet so as to judge the solidification tail end position of the continuous casting billet. The advantages are that: 1) personnel do not need to approach the high-temperature molten steel/continuous casting billet in a close range; 2) extra investment and equipment transformation are not required; 3) the operability is strong, the process flow is simple, and the detection accuracy is high. According to the method, under the normal production condition of the continuous casting machine, the existing withdrawal and straightening machine device is used for judging the solidification tail end of the casting blank, so that the method has the advantages of no need of adding extra investment and equipment transformation, no need of personnel to approach the high-temperature molten steel/continuous casting blank in a close range, strong operability, simple process flow, higher detection accuracy and the like, and effectively avoids the defects of the traditional technology for detecting the solidification tail end of the continuous casting blank.
The rollers 2 of the withdrawal and straightening unit 1 comprise a 1# roller 5, a 2# roller 6, a 3# roller 7 and a 4# roller 8, and the 1# roller 5, the 2# roller 6, the 3# roller 7 and the 4# roller 8 are arranged in a gap. In the above step, the withdrawal and straightening unit used includes a plurality of rolls, and in the present invention, four rolls are preferably provided, that is, the 1# roll 5, the 2# roll 6, the 3# roll 7, and the 4# roll 8. The number of rolls of the withdrawal and straightening unit can be increased or decreased as required.
When the continuous casting machine is normally produced, the 1# roller 5 is pressed down, other rollers 2 are lifted up, the 1# roller 5 is lifted up after the pressing down is finished, and the position is taken to press down the sample 3; pressing down the 2# roller 6 after the sample is taken, lifting up the other rollers 2, lifting up the 2# roller 6 after the sample is taken down, and taking the position to press down the sample 3; pressing down the 3# roller 7 after the sample is taken, lifting up the other rollers 2, lifting up the 3# roller 7 after the sample is taken down, and taking the position to press down the sample 3; after the sample is taken out, the 4# roller 8 is pressed down and the other rollers 2 are lifted up, and after the 4# roller 8 is pressed down, the other rollers are lifted up, and the sample 3 is pressed down at the position. And in the step, in the production process of the continuous casting billet, each roller is pressed down in sequence, pressing samples are formed at different positions of the continuous casting billet, and then the samples are taken down.
When each roller 2 of the withdrawal and straightening unit 1 is reduced, the continuous casting billet is deformed in the circumferential direction, wherein the size deformation ratio of the continuous casting billet in the inner and outer arc direction (the ratio of the size of the casting billet after reduction to the size of the casting billet before reduction) is controlled to be 88-91%. The deformation ratio can be adjusted appropriately according to the actual situation.
And (3) pressing the sample 3, placing the sample in a pickling tank for soaking after dissection is finished, wherein the solution in the pickling tank is hydrochloric acid with the concentration of 1:1, the temperature of the solution is 60-80 ℃, and the soaking time is more than 30 min. Cutting and sampling the pressed continuous casting billet, wherein the sampling length is generally controlled to be 800-1000mm, and the sample is sent to a machining center for dissection. Meanwhile, an undressed casting blank sample is taken as a comparison sample, and the specific processing mode of the undressed casting blank sample is executed by pressing the lower casting blank sample.
After the reduction is carried out by adopting the method for rapidly detecting the solidification tail end position of the continuous casting billet, if the corresponding reduction sample 3 is cut open after the 1# roller 5 is reduced and shows a state that the central porosity grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm after the acid pickling, the liquid core of the continuous casting billet is definitely behind the 1# roller 5; and (3) continuing to adopt the 2# roller 6 for pressing, and if the corresponding pressed sample 3 is cut open after the 2# roller 6 is pressed down and shows a state that the central porosity grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm after acid washing, proving that the liquid core of the continuous casting billet is still behind the 2# roller 6, and the like.
If the 1# roller 5 presses down the corresponding pressing sample 3 for splitting, and the central porosity grade is less than or equal to 1.0 grade after acid washing, and the V-shaped segregation width is greater than or equal to 50mm, and the 2# roller 6 presses down the corresponding pressing sample 3 for splitting, and the central shrinkage cavity grade is greater than 1 grade after acid washing, and the V-shaped segregation width is less than 50mm, the solidification tail end of the continuous casting billet is proved to be between the 1# roller 5 and the 2# roller 6; if the 2#6 is pressed down and the corresponding pressed sample 3 is cut open, and the pickled sample shows a state that the central porosity grade is less than or equal to 1.0 grade and the V-shaped segregation width is greater than or equal to 50mm, and the 3# roller 7 is pressed down and the corresponding pressed sample 3 is cut open, and the pickled sample shows a state that the central shrinkage cavity grade is greater than 1 grade and the V-shaped segregation width is less than 50mm, the solidification tail end of the continuous casting billet is proved to be between the 2# roller 6 and the 3# roller 7, and the like.
If the reduced sample 3 formed by reducing the 1# roller 5 is cut open and pickled, and then shows a state that the central shrinkage cavity grade is more than 1 grade and the V-type segregation width is less than 50mm, the situation proves that the solidification tail end of the continuous casting billet is in front of the 1# roller 5, the position of the solidification tail end cannot be accurately judged under the situation, and for the situation, technological parameters of the continuous casting machine are adjusted, for example, the casting speed of the continuous casting machine is increased or the cooling strength of the continuous casting billet is reduced, the position of the solidification tail end of the continuous casting billet is prolonged, and after the situation is prolonged, detection is carried out again according to the steps.
If the 4# roller 8 is subjected to reduction to form a reduced sample 3 which is cut open and pickled and then shows a state that the central shrinkage cavity grade is more than 1 grade and the V-type segregation width is less than 50mm, the situation proves that the position of the solidified tail end cannot be accurately judged under the condition that the solidified tail end of the continuous casting billet is behind the 4# roller 8, and for the situation, technological parameters of a continuous casting machine are adjusted, such as the continuous casting speed is reduced or the cooling strength of the continuous casting billet is enhanced, the position of the solidified tail end of the continuous casting billet is shortened, and the detection is carried out again according to the steps after the continuous casting is shortened.
Based on the specific embodiment, the detection method provided by the invention is mainly divided into three steps:
the method comprises the following steps: the continuous casting billet is sequentially reduced by adopting a withdrawal and straightening machine, as shown in fig. 1, wherein a specific reduction process needs to be designed by each manufacturer according to the self condition, but the deformation ratio of the reduced casting billet needs to meet the requirement. Under the production condition of a continuous casting machine, a withdrawal and straightening machine device is adopted to carry out screw-down (pressure is applied to the inner arc direction and the outer arc direction of a continuous casting billet) on the continuous casting billet of which the steel grade needs to be detected, namely a No. 1 roller is pressed down, other rollers are lifted up, the roller is lifted up after the 1# roller is pressed down, and a sample is pressed down; after the sample is taken, the 2# roller is pressed down, other rollers are lifted, and after the 2# roller is pressed down, the other rollers are lifted up, and the sample is taken down; after the sample is taken, 3# roller is pressed down, and the like, so that the continuous casting blank is deformed in the circumferential direction, wherein the size deformation ratio of the casting blank in the inner arc direction and the outer arc direction (the ratio of the size of the casting blank after being pressed down to the size of the casting blank before being pressed down) is generally controlled to be 88-91% (the deformation ratio can be properly adjusted according to the actual situation);
step two: cutting and sampling the pressed continuous casting billet, wherein the sampling length is generally controlled to be 800-: and (3) equally dividing the inner arc surface of the continuous casting blank along the length direction, and turning and grinding the divided surface after the division as shown in figure 3. After the dissection is finished, the pressed sample is placed in a pickling tank for soaking, the solution in the pickling tank is hydrochloric acid with the concentration of 1:1, the temperature of the solution is 60-80 ℃, and the soaking time is 30 min. And after soaking, taking out the pressed sample, washing and drying. At the same time, 1 sample of the non-reduced billet was taken as a control sample and the processing was carried out by pressing the lower billet sample.
Step three: and comparing the reduced samples (reduced casting blank samples) at different positions with the non-reduced samples (non-reduced casting blank samples), and if the situation that the internal central shrinkage cavity grade of the casting blank corresponding to the reduction of a certain withdrawal and straightening machine is obviously reduced and the V-shaped segregation width is not obviously reduced is found, proving that the solidification end of the casting blank is behind the withdrawal and straightening machine position. If the V-shaped width of the interior of a corresponding casting blank pressed by a certain withdrawal and straightening machine is obviously reduced and the reduction of the central shrinkage cavity grade is not obvious, the solidification tail end position is proved to be in front of the withdrawal and straightening machine. Based on the above change, the position of the solidification end of the cast strand can be estimated. In order to ensure the data accuracy, the detection steps are repeated for 1-2 times, and multiple times of correction are realized.
Case 1: and (3) adopting the steps for reduction, and if the corresponding casting blank sample after being reduced by the No. 1 roller shows a state that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm after being longitudinally cut and acid washed, proving that the casting blank liquid core is certainly behind the No. 1 roller. And (3) continuing adopting the 2# roller for reduction, and if the corresponding casting blank sample after the 2# roller reduction still shows the states of central shrinkage cavity grade being more than 1 grade and V-shaped segregation width being less than 50mm after being longitudinally cut and pickled, proving that the casting blank liquid core is still behind the 2# roller. Continuing to adopt the 3# roller for reduction, and if the corresponding casting blank sample after the 3# roller reduction still shows the states that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm after longitudinal cutting and pickling, proving that the casting blank liquid core is still behind the 3# roller, and repeating the steps;
however, if the casting blank sample corresponding to the 1# roller is longitudinally cut, pickled and then shows a state that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm, and the casting blank sample corresponding to the 2# roller is longitudinally cut, pickled and then shows a state that the central shrinkage cavity grade is 1.5 grade and the V-shaped segregation width is 35mm, the solidification end of the casting blank is between the 1# roller and the 2# roller. And if the casting blank sample corresponding to the 2# roller is longitudinally cut, pickled and then shows a state that the central shrinkage cavity grade is more than 1 grade and the V-type segregation width is less than 50mm, and the casting blank sample corresponding to the 3# roller is longitudinally cut, pickled and then shows a state that the central shrinkage cavity grade is more than 1 grade and the V-type segregation width is less than 50mm, the solidification tail end of the casting blank is proved to be between the 2# roller and the 3# roller, and the like.
Case 2: by adopting the reduction steps, if the corresponding casting blank sample after being reduced by the No. 1 roller shows the states that the central shrinkage cavity grade is more than 1 grade and the V-shaped segregation width is less than 50mm after being longitudinally cut and acid-washed, the situation that the solidification tail end of the casting blank is before the No. 1 roller is proved, and the position of the solidification tail end can not be accurately judged under the condition. In view of the situation, technological parameters of the continuous casting machine need to be adjusted, such as the casting speed of the continuous casting machine is increased or the cooling strength of the continuous casting billet is reduced, and the position of the solidification tail end of the casting billet is prolonged. And detecting after prolonging.
Case 3: by adopting the reduction steps, if the corresponding casting blank sample after being reduced by the No. 4 roller shows the states of central shrinkage cavity grade being more than 1 grade and V-shaped segregation width being less than 50mm after being longitudinally cut and acid-washed, the situation that the solidification tail end of the casting blank is behind the No. 4 roller is proved, and the position of the solidification tail end can not be accurately judged under the situation. In order to solve the problem, technological parameters of the continuous casting machine need to be adjusted, such as reducing the continuous casting speed or enhancing the cooling strength of a continuous casting billet, and shortening the position of the solidification tail end of the continuous casting billet. And detecting after shortening.
The invention provides a brand-new technical scheme based on an ingenious concept aiming at the defects in the prior art. The detection method of the invention provides a brand-new method for detecting the solidification tail end position of the casting blank in a conventional production mode (without additional investment), namely, under the normal production condition of a continuous casting machine, a withdrawal straightening machine device of the continuous casting machine is used for applying certain pressure to the square/rectangular continuous casting blank to deform the continuous casting blank. And analyzing the continuous casting billet so as to judge the solidification tail end position of the continuous casting billet. The advantages are that: 1) personnel do not need to approach the high-temperature molten steel/continuous casting billet in a close range; 2) extra investment and equipment transformation are not required; 3) the operability is strong, the process flow is simple, and the detection accuracy is high. According to the method, under the normal production condition of the continuous casting machine, the existing withdrawal and straightening machine device is used for judging the solidification tail end of the casting blank, so that the method has the advantages of no need of adding extra investment and equipment transformation, no need of close approach of personnel to high-temperature molten steel/continuous casting blank, strong operability, simple process flow, higher detection accuracy and the like, and effectively avoids the defects of the traditional technology for detecting the solidification tail end of the continuous casting blank.
The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments disclosed, but is intended to cover various modifications, changes and equivalents of the embodiments of the invention, and its application to other applications without departing from the spirit and scope of the invention.
Claims (10)
1. A method for rapidly detecting the solidification tail end position of a continuous casting billet is characterized by comprising the following steps: the method for rapidly detecting the solidification tail end position of the continuous casting billet comprises the following detection steps:
s1, a withdrawal and straightening machine (1) comprises a plurality of rollers (2), the rollers (2) of the withdrawal and straightening machine (1) sequentially press down a continuous casting billet, and the rollers (2) apply pressure in the inner and outer arc directions of the continuous casting billet during pressing down;
s2, cutting the continuous casting blank pressed by each roller (2) respectively to take down the pressing sample (3), and dissecting the pressing sample (3) in a mode of splitting the inner arc surface of the pressing sample (3) along the length direction;
s3, cutting open the plurality of pressing samples (3), turning and grinding the cut surfaces, and then soaking the turned and ground pressing samples (3) in a pickling tank;
s4, taking out the sample (3) after soaking, washing, drying, and taking a sample (4) which is not pressed down as a comparison sample;
s5, different rolling samples (3) formed by rolling down different rollers (2) are respectively compared with non-rolling samples (4), and if the situation that the level of the central shrinkage cavity in the rolling sample (3) formed by rolling down one roller (2) of the rolling samples (3) is reduced and the V-shaped segregation width is not obviously reduced is found, the solidification tail end of the continuous casting billet is proved to be behind the corresponding position of the roller (2); if the V-shaped segregation width in the depressed sample (3) formed by the depression of a certain roller (2) is obviously reduced and the reduction of the central shrinkage cavity grade is not obvious, the solidification tail end position is proved to be behind the corresponding position of the roller (2); based on the above changes, the solidification end position of the slab on the slab is estimated.
2. The method for rapidly detecting the solidification end position of a continuous casting slab as claimed in claim 1, wherein: to ensure data accuracy, the above detection steps are repeated 1-2 times.
3. The method for rapidly detecting the solidification end position of a continuous casting slab as claimed in claim 1 or 2, wherein: the roller (2) of the withdrawal and straightening unit (1) comprises a 1# roller (5), a 2# roller (6), a 3# roller (7) and a 4# roller (8), and the 1# roller (5), the 2# roller (6), the 3# roller (7) and the 4# roller (8) are arranged in a clearance mode.
4. The method for rapidly detecting the solidification end position of a continuous casting slab as claimed in claim 3, wherein: when the continuous casting machine is normally produced, the 1# roller (5) is pressed down, other rollers (2) are lifted up, the 1# roller (5) is lifted up after the pressing down is finished, and the position of the position is taken to press down the sample (3); after the sample is taken, the 2# roller (6) is pressed down, other rollers (2) are lifted up, the 2# roller (6) is lifted up after the sample is taken down, and the sample (3) is pressed down at the position; after the sample is taken, the 3# roller (7) is pressed down, other rollers (2) are lifted up, the 3# roller (7) is lifted up after the sample is taken down, and the sample (3) is pressed down at the position; after the sample is taken out, the roller No. 4 (8) is pressed down, the other rollers (2) are lifted up, the roller No. 4 (8) is lifted up after the sample is taken out, and the sample (3) is pressed down at the position.
5. The method for rapidly detecting the solidification end position of a continuous casting slab as claimed in claim 4, wherein: when each roller (2) of the withdrawal and straightening machine (1) is pressed down, the continuous casting billet is deformed in the circumferential direction, wherein the size deformation ratio of the continuous casting billet in the inner and outer arc directions is controlled to be 88-91%.
6. The method for rapidly detecting the solidification end position of a continuous casting slab as claimed in claim 1 or 2, wherein: and (3) pressing the sample (3) and placing the sample in a pickling tank for soaking after the dissection is finished, wherein the solution in the pickling tank is hydrochloric acid with the concentration of 1:1, the temperature of the solution is 60-80 ℃, and the soaking time is more than 30 min.
7. The method for rapidly detecting the solidification end position of a continuous casting slab as claimed in claim 4, wherein: after the reduction is carried out by adopting the method for rapidly detecting the solidification tail end position of the continuous casting billet, if the corresponding reduction sample (3) is cut open after the 1# roller (5) is reduced and shows a state that the central porosity grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm after the acid washing, the continuous casting billet liquid core is proved to be certainly behind the 1# roller (5); and (3) continuing to adopt the 2# roller (6) for pressing, and if the corresponding pressed sample (3) is cut open after the 2# roller (6) is pressed down and shows a state that the central porosity grade is less than or equal to 1.0 grade and the V-shaped segregation width is more than or equal to 50mm after acid washing, proving that the liquid core of the continuous casting billet is still behind the 2# roller (6), and repeating the steps.
8. The method for rapidly detecting the solidification end position of a continuous casting slab as claimed in claim 4, wherein: if the 1# roller (5) presses the corresponding pressing sample (3) to split and present a state that the central porosity grade is less than or equal to 1.0 grade and the V-type segregation width is greater than or equal to 50mm after acid washing, and the 2# roller (6) presses the corresponding pressing sample (3) to split and present a state that the central shrinkage cavity grade is greater than 1 grade and the V-type segregation width is less than 50mm after acid washing, the solidification tail end of the continuous casting billet is proved to be between the 1# roller (5) and the 2# roller (6); if the 2#6 is pressed down and the corresponding pressed sample (3) is cut open and pickled to present a state that the central porosity grade is less than or equal to 1.0 grade and the V-type segregation width is greater than or equal to 50mm, and the 3# roller (7) is pressed down and the corresponding pressed sample (3) is cut open and pickled to present a state that the central shrinkage cavity grade is greater than 1 grade and the V-type segregation width is less than 50mm, the solidification tail end of the continuous casting billet is proved to be positioned between the 2# roller (6) and the 3# roller (7), and the rest is done in sequence.
9. The method for rapidly detecting the solidification end position of a continuous casting slab as claimed in claim 4, wherein: if the reduced sample (3) formed by reducing the 1# roller (5) is cut open and pickled, and then the state that the central shrinkage cavity grade is more than 1 grade and the V-type segregation width is less than 50mm is presented, the situation that the solidification tail end of the continuous casting billet is in front of the 1# roller (5) is proved, the position of the solidification tail end cannot be accurately judged under the situation, and for the situation, technological parameters of the continuous casting machine are adjusted, for example, the casting speed of the continuous casting machine is increased or the cooling strength of the continuous casting billet is reduced, the position of the solidification tail end of the continuous casting billet is prolonged, and detection is carried out again according to the steps after the situation is prolonged.
10. The method for rapidly detecting the solidification end position of a continuous casting slab as claimed in claim 4, wherein: if the 4# roller (8) is subjected to reduction to form a reduced sample (3) which is cut open and pickled and then shows a state that the central shrinkage cavity grade is more than 1 grade and the V-type segregation width is less than 50mm, the situation that the solidification tail end of the continuous casting billet is behind the 4# roller (8) is proved that the position of the solidification tail end cannot be accurately judged under the situation, and for the situation, technological parameters of a continuous casting machine are adjusted, such as the continuous casting speed is reduced or the cooling strength of the continuous casting billet is enhanced, the position of the solidification tail end of the continuous casting billet is shortened, and the detection is carried out again according to the steps after the shortening.
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| CN116242651A (en) * | 2023-05-11 | 2023-06-09 | 常州润来科技有限公司 | Copper pipe blank sampling method and device for horizontal continuous casting process |
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| CN112784367A (en) * | 2020-12-10 | 2021-05-11 | 江阴兴澄特种钢铁有限公司 | Method for calculating thickness of blank shell at position of continuous casting roller row and solidification tail end of casting machine |
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| CN101920323A (en) * | 2010-08-02 | 2010-12-22 | 河北钢铁股份有限公司邯郸分公司 | Dynamic soft reduction method for detecting tail end of solidified liquid core of casting blank based on pressure feedback |
| CN104493121A (en) * | 2014-11-28 | 2015-04-08 | 东北大学 | Online detection method for solidified bottom end position in bloom continuous casting production process |
| CN107363230A (en) * | 2017-07-31 | 2017-11-21 | 中冶赛迪工程技术股份有限公司 | A kind of method of on-line checking continuous casting billet liquid phase fraction and solidification end |
| CN112784367A (en) * | 2020-12-10 | 2021-05-11 | 江阴兴澄特种钢铁有限公司 | Method for calculating thickness of blank shell at position of continuous casting roller row and solidification tail end of casting machine |
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| CN116242651A (en) * | 2023-05-11 | 2023-06-09 | 常州润来科技有限公司 | Copper pipe blank sampling method and device for horizontal continuous casting process |
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