CN114054710A - Method for improving center quality of large-section rectangular continuous casting billet - Google Patents
Method for improving center quality of large-section rectangular continuous casting billet Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
Abstract
The invention provides a method for improving the center quality of a large-section rectangular continuous casting billet, which comprises the following steps: setting a first area aiming at the wide surface of a casting blank; setting a second region for a narrow surface of the casting blank, wherein the first region and the second region respectively comprise at least one subarea; different water distribution schemes are configured for each zone. The method of the invention improves the appearance of the liquid core molten pool of the rectangular billet by more reasonably configuring the design of the two cooling areas and differentiating the configuration of the wide and narrow cooling areas, provides a smoother flow field condition for the electromagnetic stirring function at the solidification tail end, improves the cooling and solidification rate of a key area, improves the electromagnetic stirring current efficiency, further matches with a series of continuous casting conventional processes to realize the effective improvement of the central part quality of the large-section rectangular casting blank, lays an important basic condition for the improvement of the quality of the parent metal of a product, and provides a positive condition for the fine regulation and control of the organization in the application process of the product.
Description
Technical Field
The invention relates to a method for improving the center quality of a large-section rectangular continuous casting billet.
Background
As the most common important material applied in daily production and life of people, the quality and performance requirements of steel change along with the continuous development of society. Because key quality indexes such as homogeneity, cleanliness and compactness of the steel material have important influence on the mechanical property of the product, the product performance requirement of the steel material is continuously improved. In order to meet the performance requirements of the steel materials for continuous development and practically promote the upgrading of the production technology of the steel products, a great deal of technical research is started by the majority of researchers to promote the quality improvement of the steel products. For example, in the aspect of controlling the non-metallic inclusions, students gradually develop towards the aspect of refining and utilizing the non-metallic inclusions besides researching to reduce the inclusion grade and improve the quality control level of natural components which can never be completely removed from steel products, and the fine and dispersed non-metallic inclusions can provide an important nucleation core for refining grains, so that the improvement of the product performance is realized; further, for homogenization control of steel products, the study of center segregation (the most serious solute enrichment) of the conventional slab for repairing the defects has been progressing toward full-face homogenization, and the study of the scale has been progressing from macro-homogeneity to semi-macro-homogeneity and micro-homogeneity.
With the continuous upgrading of the continuous casting equipment process technology, the potential played by the continuous casting high-efficiency effect is continuously released, and the large-section continuous casting production plays an important role in the process. For example, steel rails, which are important components for railway transportation infrastructure, are continuously reduced in the number density of railway line welded joints and continuously developed to be long in length in order to meet the requirement of high speed railway transportation; in order to meet the heavy-load freight transportation requirement, the section of a heavy-load line steel rail is increased, and the method is of great importance in breaking through the core technical problem of large-section continuous casting production under the specific equipment process technical environment condition. The difference of local solidification rates of the sections is increased after the sections of the casting blanks are increased, the homogeneity control difficulty is increased, and particularly, the central macro and semi-macro segregation is aggravated, so that the application performance and the tissue regulation of products are seriously influenced. For example, the segregation of carbon and manganese in the center of a high-carbon steel casting blank can generate carbide and martensite precipitation; the center segregation may cause the rail to break in an "S" shape, etc. And for another important component of power transmission, namely a gear, the increase of the section of the gear steel continuous casting billet can improve the rolling compression ratio and promote the refinement and the promotion of the grain structure, but the increase of the section of the casting billet can increase the control difficulty of the homogeneity of the casting billet, influence the regulation and control of the section structure uniformity, even influence the stability of the effect of a heat treatment process and the like.
The casting blank quality control is always an important research field of ferrous metallurgy, the quality improvement control of the interior of a bloom casting blank is a more important and more challenging research item, and a great deal of research on the quality improvement control of the bloom casting blank is carried out by the majority of metallurgy science and technology workers, but the invention does not relate to the method for improving the central quality of the large-section rectangular continuous casting blank.
For example:
CN110303125A A big square billet heavy rail steel homogeneity and compactness cooperative promotion control method emphasizes that continuous casting electromagnetic stirring in a continuous casting stage adopts continuous casting crystallizer electromagnetic stirring combined with secondary cooling electromagnetic stirring, wherein the crystallizer electromagnetic stirring adopts slight stirring, and the specific installation position of the secondary cooling electromagnetic stirring is within a range of 5.0-6.0 m from the steel liquid level of the crystallizer; the superheat degree of the tundish casting molten steel is executed according to 35-45 ℃; in the continuous casting secondary cooling stage, a secondary cooling area is required to cover 15.0m away from the molten steel level of the crystallizer; and the total pressing amount is executed according to 8-10 mm when the solidification tail end is pressed down. By adopting the process, the composition of a casting blank solidification structure is improved and controlled, the crystal grain form of an isometric crystal area is changed, the uniformity of the solidification structure and components is improved obviously, and then the center porosity can be reduced by only needing small reduction amount by matching with a reasonable solidification tail end reduction technology, so that the compactness of the casting blank is improved obviously, and the cooperative improvement of the homogeneity and the compactness of the casting blank is realized under the most economical and practical condition. However, the method for improving the center quality of the large-section rectangular continuous casting billet is not related to the invention.
CN109396368A discloses a method for improving the internal quality of a high-carbon steel bloom continuous casting billet, which comprises the following steps: (1) selecting high-carbon steel for continuous casting production; (2) controlling the drawing speed of the continuous casting billet to be 0.45-0.6 m/min; adjusting the specific water amount of the secondary cooling area to be 0.15-0.30L/kg, wherein the specific water amount ratio of the continuous casting blank in the width direction to the thickness direction is 1: 1-3: 1; (3) controlling the surface temperature of the wide surface of a casting blank in the reduction interval to be 600-800 ℃ and the surface temperature of the thickness to be 700-900 ℃; (4) electromagnetic stirring is arranged in front of the first press roller; a reduction interval is determined by a solid phase ratio calculated from a distance between a liquid phase point and a solid phase point, and the reduction amount of each of the rolls is determined in the reduction interval based on the solid phase ratio, the total reduction amount and a coefficient k. The method can reduce the defects of center segregation, center porosity, center shrinkage cavity and the like of the high-carbon steel continuous casting billet, and effectively improve the internal quality of the continuous casting billet. However, the method for improving the center quality of the large-section rectangular continuous casting billet is not related to the invention.
CN105935752A relates to a vertical electromagnetic stirring method of control casting blank center quality. In the method, in the continuous casting production process, a travelling wave magnetic field type stirrer is arranged on the side surface of a casting blank, and the general direction of electromagnetic force generated in the casting blank is parallel to the central line direction of the casting blank. And the traveling wave magnetic field type electromagnetic stirrers with different shapes can be selected according to different shapes and sizes of the sections of the casting blanks. The power frequency of the vertical electromagnetic stirrer is 0.5-50 Hz, and the current is 50-3000A. The method can enable the melt in the central area of the casting blank to generate upward or downward forced convection motion along the central line of the casting blank, improve the effective action area of electromagnetic stirring along the length direction of the casting blank, strengthen the mixing of the upper high-temperature melt area and the lower low-temperature melt area in the central area of the casting blank, improve the feeding capacity of the upper melt in the central area of the casting blank to the lower melt during solidification, and promote the homogenization of the temperature and solute distribution in the casting blank. However, the specific contents of the method for improving the center quality of the large-section rectangular continuous casting slab provided by the invention are not related.
CN107657108A discloses a continuous casting billet macrosegregation prediction method, which is characterized in that: the method comprises the following steps: the method comprises the following steps of firstly, establishing a continuous casting solidification macrosegregation model to obtain the solute concentration distribution and temperature distribution condition in a continuous casting billet when the precipitation of inclusions is not considered; secondly, introducing an inclusion precipitation calculation model; according to the thermodynamic theory of impurity precipitation and the solute mass conservation law, calculating and obtaining the precipitation distribution condition of impurities in the casting blank, the solute consumption caused by impurity precipitation and the like; and thirdly, recalculating and correcting the solute concentration distribution calculated by the continuous casting macrosegregation model according to the solute concentration after the inclusion precipitation, and finally predicting and obtaining the solute macrosegregation distribution in the continuous casting blank considering the inclusion precipitation. The method for predicting the macrosegregation of the continuous casting billet has the advantages of lower cost and higher efficiency, and can more accurately predict the macrosegregation distribution condition of solutes in the continuous casting billet; the prediction result can be used for optimizing the continuous casting process and improving the quality of the continuous casting billet. However, the specific contents of the method for improving the center quality of the large-section rectangular continuous casting slab provided by the invention are not related.
Disclosure of Invention
This application summarizes aspects of the embodiments and should not be used to limit the claims. Other embodiments are contemplated in accordance with the techniques described herein, as will be apparent to those skilled in the art upon studying the following drawings and detailed description, and are intended to be included within the scope of the application.
The technical problem to be solved by the invention is as follows: the method can effectively optimize the center quality of the rectangular continuous casting billets with the sections of 280mm multiplied by 380mm, 320mm multiplied by 410mm and 360mm multiplied by 450mm, improve the macrosegregation and the semi-macrosegregation of the center area, and provide important technical guarantee for the high-quality production of the rectangular continuous casting billets with the large sections.
According to the invention, the method for improving the center quality of the large-section rectangular continuous casting billet comprises the following steps:
setting a first area aiming at the wide surface of a casting blank;
setting a second region for a narrow surface of the casting blank, wherein the first region and the second region respectively comprise at least one subarea;
different water distribution schemes are configured for each zone.
In an embodiment of the invention, the first zone starts at a first distance from a crystallizer liquid level and ends at a second distance from the crystallizer liquid level, and the second zone starts at the first distance from the crystallizer liquid level and ends at a third distance from the crystallizer liquid level.
In an embodiment of the present invention, the first distance is 800 to 1000mm, the second distance is 6000 to 8000mm, and the third distance is 10000 to 12000 mm.
In an embodiment of the invention, the first distance is 900mm, the second distance is 7500mm, and the third distance is 11000 mm.
In an embodiment of the present invention, the first zone and the second zone are located in a secondary cooling zone and each comprise a first partition, a second partition, a third partition and a fourth partition, and the second zone further comprises a fifth partition.
In the embodiment of the invention, the water distribution scheme of the first zone of the first area is 14-16% of water distribution, the water distribution scheme of the second zone of the first area is 12-14% of water distribution, the water distribution scheme of the third zone of the first area is 11-13% of water distribution, and the water distribution scheme of the fourth zone of the first area is 5-7% of water distribution; the water distribution scheme of the first area of the second area is 14% -16% of water distribution, the water distribution scheme of the second area is 9% -11% of water distribution, the water distribution scheme of the third area of the second area is 9% -11% of water distribution, the water distribution scheme of the fourth area of the second area is 8% -11% of water distribution, and the water distribution scheme of the fifth area of the second area is 8% -10% of water distribution.
In an embodiment of the invention, the method further comprises:
and arranging a second cooling electromagnetic stirrer at a fourth distance from the liquid level of the crystallizer, wherein the fourth distance is 5000-6000 mm.
In an embodiment of the invention, the method further comprises: and arranging induction heating equipment at a fifth distance in front of the straightening area, wherein the fifth distance is 500-3500 mm.
In an embodiment of the invention, the method further comprises:
setting the position of the solidified shell solidus line reaching the center as a reference point;
and carrying out tail end pressing on one or more groups of rollers before and after the reference point.
In an embodiment of the present invention, the pressing down the end of the solidifying section of one or more sets of rollers before and after the reference point includes:
and performing tail end pressing of the solidification section on the three groups of rollers before the reference point and the two groups of rollers after the reference point, wherein the pressing amount of each roller is 10-15%, 15-20%, 25-30% and 15-30% in sequence along the blank drawing direction.
The method of the invention improves the appearance of the liquid core molten pool of the rectangular billet by more reasonably configuring the design of the two cooling areas and differentiating the configuration of the wide and narrow cooling areas, provides a smoother flow field condition for the electromagnetic stirring function at the solidification tail end, improves the cooling and solidification rate of a key area, improves the electromagnetic stirring current efficiency, further matches with a series of continuous casting conventional processes to realize the effective improvement of the central part quality of the large-section rectangular casting blank, lays an important basic condition for the improvement of the quality of the parent metal of a product, and provides a positive condition for the fine regulation and control of the organization in the application process of the product.
These and other aspects, objects, and features of the disclosure will be understood and appreciated by those skilled in the art upon studying the following specification, claims, and appended drawings.
Drawings
For a more complete understanding of embodiments of the present application, reference should be made to the embodiments illustrated in greater detail in the accompanying drawings and described below by way of example, wherein:
FIG. 1 is a schematic view of the continuous casting apparatus of the present invention;
FIG. 2 is a flow chart of an embodiment of the method for improving the center quality of a large-section rectangular continuous casting slab.
Detailed Description
Embodiments of the present disclosure are described below. However, it is to be understood that the disclosed embodiments are merely examples and that other embodiments may take various and alternative forms. The figures are not necessarily to scale; certain features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present application. As will be appreciated by one of skill in the art, various features illustrated and described with reference to any one of the figures may be combined with features illustrated in one or more other figures to produce embodiments that are not explicitly illustrated or described. The combination of features shown provides a representative embodiment for a typical application. However, various combinations and modifications of the features consistent with the teachings of the present disclosure may be desirable for certain specific applications or implementations.
Moreover, in this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
One or more embodiments of the present application will be described below with reference to the accompanying drawings. Flow diagrams illustrate processes performed by systems according to the present application, it being understood that the flow diagrams need not be performed in an order, one or more steps may be omitted, one or more steps may be added, and one or more steps may be performed in an order or reversed, or even simultaneously in some embodiments.
Continuous casting, i.e. continuous casting of steel, is a process in which molten steel releases sensible heat and latent heat and gradually solidifies into a shaped cast slab in a continuous state. Fig. 1 shows a schematic view of a continuous casting plant 100 for continuous casting. As shown in fig. 1, the continuous casting apparatus 100 may include a ladle 105, a tundish 110, and a mold 120. In addition, the continuous casting apparatus 100 includes a secondary cooling zone 125 and a withdrawal and straightening zone 130. Molten steel from ladle 105 enters tundish 110 and then enters crystallizer 120. The molten steel entering the mold 120 is solidified in the mold to form a cast slab having a slab shell and a liquid core. And then the casting blank with the liquid core enters a secondary cooling area 125 to be continuously cooled, the blank shell uniformly and stably grows, the liquid core is gradually solidified towards the center, and finally the casting blank is completely solidified. Particularly for large-section running casting blanks, the higher central quality of the casting blank lays an important basic condition for improving the quality of the base metal of the product, and meanwhile, positive conditions are provided for fine regulation and control of the structure in the application process of the product. Based on the above, the inventor of the invention aims to improve the center quality of the large-section rectangular continuous casting billet.
According to the present invention, there is provided a method for improving the center quality of a large-section rectangular continuous casting slab, as shown in fig. 2, comprising:
s1, setting a first area aiming at the wide surface of a casting blank;
s2, setting a second area aiming at the narrow surface of the casting blank, wherein the first area and the second area respectively comprise at least one subarea;
and S3, configuring different water distribution schemes for each subarea (so as to implement forced cooling with the cooperation of wide and narrow surfaces).
In addition, the method of the present invention further comprises:
s4, placing an induction heating device at a fifth distance before the withdrawal and straightening area, i.e., the present invention may also include an electromagnetic rewarming technique before withdrawal and straightening, as described elsewhere in the present invention.
In the embodiment of the present invention, the first region and the second region may be set with the mold liquid level as a reference. Fig. 1 shows a schematic view of crystallizer liquid level 121, and the first and second zones may be located in secondary cooling zone 125. To optimize billet center mass, the area of broad and narrow face coverage in the secondary cooling zone 125 may be differentiated. For example, a first zone may start at a first distance from the crystallizer liquid level 121 to end at a second distance from the crystallizer liquid level 121, and a second zone may start at the first distance from the crystallizer liquid level 121 to end at a third distance from the crystallizer liquid level 121. The first distance can be 800-1000 mm, the second distance can be 6000-8000 mm, and the third distance can be 10000-12000 mm. In one embodiment, the first distance is 900mm, the second distance is 7500mm, and the third distance is 11000 mm.
The first zone and the second zone may each comprise a first partition, a second partition, a third partition and a fourth partition, and the second zone further comprises a fifth partition, and different water distribution schemes may be configured for the first to fourth partitions of the first zone and the first to fifth partitions of the second zone. In an embodiment of the present invention, the first zone and the second zone may divide the first zone to the fourth zone from a zone at a first distance from the crystallizer liquid level 121 to a second distance from the crystallizer liquid level 121, and the second zone may divide the fifth zone from a zone at a second distance from the crystallizer liquid level 121 to a fifth distance from the crystallizer liquid level 121. In one embodiment, the first zone and the second zone may be divided into a first sub-zone to a fourth sub-zone from a zone which is 900mm away from the liquid level of the crystallizer to a zone which is 7500mm away from the liquid level of the crystallizer, and the second zone is divided into a fifth sub-zone from a zone which is 7500mm away from the liquid level of the crystallizer to a zone which is 10000mm away from the liquid level of the crystallizer.
In the embodiment of the invention, for the total water amount of the first area and the second area, the water distribution scheme of the first area can be 14% -16% of water distribution, the water distribution scheme of the second area of the first area can be 12% -14% of water distribution, the water distribution scheme of the third area of the first area can be 11% -13% of water distribution, and the water distribution scheme of the fourth area of the first area can be 5% -7% of water distribution; the water distribution scheme of the first subarea of the second area can be 14-16% of water distribution, the water distribution scheme of the second subarea of the second area can be 9-11% of water distribution, the water distribution scheme of the third subarea of the second area can be 9-11% of water distribution, the water distribution scheme of the fourth subarea of the second area can be 8-11% of water distribution, and the water distribution scheme of the fifth subarea of the second area can be 8-10% of water distribution; the specific water amount may be 0.28 to 0.64L/kg of steel, preferably 0.28 to 0.42L/kg of steel. Because the wide and narrow surfaces of the casting blank have heat transfer characteristic difference, the areas corresponding to the wide and narrow surfaces are partitioned, and the quality of the center of the casting blank can be improved by utilizing the heat transfer characteristic difference of the wide and narrow surfaces. For example, after the first to fourth partitions of the first and second regions are cooled, the temperature of the cast slab is considerably lower than that of the cast slab immediately after entering the secondary cooling zone, and the amount of cooling water required at this time is low.
In addition, according to the embodiment of the invention, the forced cooling is also prepared through low superheat degree casting to promote the molten steel to be rapidly cooled, crystallized and solidified so as to effectively inhibit solute elements from being macroscopically diffused, migrated and gathered at the center of the casting blank. In one embodiment, the superheat degree of molten steel in the casting process of low-superheat-degree casting can be controlled to be 10-30 ℃. Furthermore, continuous casting electromagnetic stirring is adopted to interfere dendritic crystal growth, and center segregation control is improved; the length of the liquid core is shortened through rapid cooling solidification, the macroscopic morphology of the liquid core molten pool is changed, and feeding is improved; more importantly, induction heating is carried out after solidification is finished, so that the temperature of a casting blank is ensured to be in a plastic temperature range during withdrawal and straightening, as described in other parts of the invention.
In addition to the differentiated secondary cooling zone width and width coverage, the center quality of the cast slab can be improved by combining the electromagnetic stirring process and solidification end reduction, as described in detail below.
The method further comprises the step of arranging a second cold electromagnetic stirrer at a fourth distance from the liquid level 121 of the crystallizer, wherein the fourth distance can be 5000-6000 mm. The two-cooling electromagnetic stirrer can be combined with a crystallizer electromagnetic stirrer arranged in a crystallizer, thereby improving the solidification process and obtaining good casting blank quality. Through the combined mode, the electromagnetic stirring control is carried out on the crystallizer section with electromagnetic interference, a circumferential rotating flow field is formed in the crystallizer, the scouring of the molten steel flow of the submerged nozzle on the solidified shell is weakened, and the uniformity of the shell is improved; and the secondary cooling section adopts secondary cooling electromagnetic stirring to scour and melt dendritic crystal structures, so that the molten steel nucleation and crystallization in the central area are promoted to be rapidly solidified. In one embodiment, the current intensity of the electromagnetic stirrer of the crystallizer can be 50-200A, and the current frequency can be 2.4 Hz; the current intensity of the secondary cooling electromagnetic stirrer can be 200-400A, and the current frequency can be 6.0-7.0 Hz.
The method further comprises the step of arranging induction heating equipment at a fifth distance in front of the withdrawal and straightening area 130 according to the specific condition of the temperature evolution distribution of the casting blank, wherein the fifth distance is an area of 500-3500 mm. The induction heating equipment is arranged to supply heat to the casting blank, and the temperature of the casting blank is increased to a plastic temperature area for straightening and withdrawal, so that cracks in the straightening and withdrawal process are avoided.
The method of the present invention further comprises setting a position at which the solidus line of the solidified shell reaches the center as a reference point; and carrying out tail end pressing on one or more groups of rollers before and after the reference point. Wherein the pressing down of the end of the solidification section of one or more groups of rollers in front of and behind the reference point comprises: and performing tail end pressing of the solidification section on the three groups of rollers before the reference point and the two groups of rollers after the reference point, wherein the pressing amount of each roller is 10-15%, 15-20%, 25-30% and 15-30% in sequence along the blank drawing direction.
After the molten steel passes through the crystallizer to form a blank shell, the blank shell still comprises a liquid core, and after passing through the secondary cooling area, the liquid core is gradually solidified from the periphery to the center. The position where solidification reaches the center of the cast slab may be set as a reference point, and one or more sets of rollers before and after the reference point are subjected to end reduction of the solidified section. The subsequent steps of the continuous casting process may be performed later, for example, in one embodiment, the casting superheat degree may be 20 to 30 ℃ and the continuous casting drawing speed may be 0.40 to 0.72 m/min.
The method is particularly suitable for producing high-quality casting blanks with the section sizes of 280mm multiplied by 380mm, 320mm multiplied by 410mm and 360mm multiplied by 450mm, and can effectively optimize the center quality of rectangular continuous casting blanks with the sections of 280mm multiplied by 380mm, 320mm multiplied by 410mm and 360mm multiplied by 450 mm. It should be understood, however, that the above cross-sectional dimensions are merely exemplary and that the method of the present invention is equally applicable to producing billets of other cross-sectional dimensions.
The method, the use and the technical effects thereof of the present invention are further illustrated by the following examples.
Example 1
This example is a continuous casting bloom of heavy rail steel of 280mm x 380mm cross-section U71Mn series produced by a steel plant using the method of the present invention.
The specific implementation conditions are as follows: (1) and differentiating the coverage area of the wide surface and the narrow surface of the second cooling section, wherein the wide surface starts from being 900mm away from the liquid level of the crystallizer to ending from 7500mm away from the liquid level of the crystallizer, and the narrow surface starts from being 900mm away from the liquid level of the crystallizer to ending from 10000mm away from the liquid level of the crystallizer. The wide surface and the narrow surface are divided into two cold first areas to four areas from the area which is 900mm away from the liquid level of the crystallizer to the area which is 7500mm away from the liquid level of the crystallizer, and the area which is 10000mm away from the area which is 7500mm away from the liquid level of the crystallizer from the narrow surface is used as two cold five areas. (2) Water distribution is as follows: the width of the first area is 15 percent respectively; the wide surface of the second zone is 14 percent, and the narrow surface is 10 percent; the three-region wide face is 11 percent, and the narrow face is 11 percent; the wide surface of the four regions is 6 percent, and the narrow surface is 9 percent; and 9% of the narrow surface of the five regions, and distributing the total water amount, wherein the specific water amount is 0.38-0.42L/kg of steel. (3) A combined electromagnetic stirring technology is adopted, wherein the combined electromagnetic stirring technology comprises a crystallizer electromagnetic stirrer and a secondary cooling electromagnetic stirrer, and the secondary cooling electromagnetic stirrer is arranged 5000mm away from the liquid level of the crystallizer. The current intensity of the electromagnetic stirrer of the crystallizer is 100A, and the current frequency is 2.4 Hz; the electromagnetic stirring current intensity at the solidification end is 200A, and the frequency is 7.0 Hz. (4) And (3) adopting solidification tail end pressing, wherein the pressing is carried out by taking the position where the solidus line of the solidified shell reaches the center as a reference point, the front three groups of rollers and the rear two groups of rollers of the reference point, the total pressing amount is controlled to be 12-14 mm, and the pressing amounts of the rollers are 10-12%, 17-18%, 20%, 30% and 23-27% in sequence along the blank drawing direction. (5) On the basis of realizing width and thickness direction cooling cooperation and efficient solidification by differential coverage and forced cooling of the wide and narrow surfaces of a casting blank in the continuous casting process, an induction heating device is installed in the area 500-3500 mm in front of a pulling and straightening section to supply heat to the casting blank, and the temperature of the casting blank is increased to the plastic temperature area for pulling and straightening so as to avoid cracks in the pulling and straightening process. (6) The method is carried out by matching with other continuous casting processes, and the casting superheat degree is 20-30 ℃; the continuous casting speed is 0.68-0.72 m/min.
Besides the above key technical points, the present invention needs to be implemented according to requirements, and other continuous casting system processes are required to be implemented according to conventional implementation.
Carrying out section corrosion on a test casting blank, and carrying out semi-macrosegregation area ratio statistics on a corrosion sample, wherein the semi-macrosegregation area ratio is controlled to be 0.25-0.27% (the control level of the casting blank produced by the common process is 0.35-0.40%); carrying out center segregation chemical inspection (the sampling size is phi 5mm) on a longitudinal sample of a casting blank, controlling the center segregation degree of a C element to be 1.09-1.15, reducing the segregation degree by 0.10 compared with the casting blank produced by a common process, and reducing the segregation degree range from 0.12 to 0.06, namely improving the center segregation and the center quality stability; the density of the central area of the casting blank is controlled to be 0.93-0.96, which is superior to 0.89-0.91 of the casting blank produced by the conventional process.
Example 2
In the embodiment, a steel mill adopts the method of the invention to produce 42CrMo series crankshaft steel continuous casting blooms with the cross section of 360mm multiplied by 450 mm.
The specific implementation conditions are as follows: (1) and differentiating the coverage areas of the wide and narrow surfaces of the second cooling section, wherein the wide surface starts from 900mm away from the liquid level of the crystallizer to 7500mm away from the liquid level of the crystallizer, and the narrow surface starts from 900mm away from the liquid level of the crystallizer to 12000mm away from the liquid level of the crystallizer. The regions from 900mm away from the crystallizer liquid level to 7500mm away from the crystallizer liquid level of the wide surface and the narrow surface are divided into two-cooling one region to four regions, and the regions from 7500mm away from the crystallizer liquid level to 12000mm away from the crystallizer liquid level of the narrow surface are used as two-cooling five regions. (2) Water distribution is as follows: the width of one area is 16% of each wide and narrow surface; the wide surface of the second zone is 12% -13%, and the narrow surface is 11%; 13% of three-region wide face and 10% of narrow face; the wide surface of the four regions is 5-6 percent, and the narrow surface is 8 percent; and 8% of the narrow surface of the five regions, and distributing the total water amount, wherein the specific water amount is 0.30-0.34L/kg of steel. (3) A combined electromagnetic stirring technology is adopted, wherein the combined electromagnetic stirring technology comprises a crystallizer electromagnetic stirrer and a secondary cooling electromagnetic stirrer, and the secondary cooling electromagnetic stirrer is arranged 6000mm away from the liquid level of the crystallizer. The current intensity of the electromagnetic stirrer of the crystallizer is 200A, and the current frequency is 2.4 Hz; the solidification end electromagnetic stirring current intensity is 400A, and the frequency is 7.0 Hz. (4) And (3) adopting solidification tail end pressing, wherein the pressing is carried out by taking the position where the solidus line of the solidified shell reaches the center as a reference point, the front three groups of rollers and the rear two groups of rollers of the reference point, the total pressing amount is controlled to be 15-16 mm, and the pressing amounts of the rollers are 12-13%, 15-18%, 20%, 27% and 17-22% in sequence along the blank drawing direction. (5) On the basis of realizing width and thickness direction cooling cooperation and efficient solidification by differential coverage and forced cooling of the wide and narrow surfaces of a casting blank in the continuous casting process, an induction heating device is installed in the area 500-3500 mm in front of a pulling and straightening section to supply heat to the casting blank, and the temperature of the casting blank is increased to the plastic temperature area for pulling and straightening so as to avoid cracks in the pulling and straightening process. (6) The method is carried out by matching with other continuous casting processes, and the casting superheat degree is 20-30 ℃; the continuous casting speed is 0.40-0.55 m/min.
Besides the above key technical points, the present invention needs to be implemented according to requirements, and other continuous casting system processes are required to be implemented according to conventional implementation.
Carrying out section corrosion on a test casting blank, and carrying out semi-macrosegregation area ratio statistics on a corrosion sample, wherein the semi-macrosegregation area ratio is controlled to be 0.24-0.28% (the control level of the casting blank produced by the common process is 0.30-0.37%); carrying out center segregation chemical inspection (the sampling size is phi 5mm) on a longitudinal sample of the casting blank, controlling the center segregation degree of the C element to be 1.09-1.12, reducing the segregation degree to 0.08 compared with the casting blank produced by the common process, and reducing the segregation degree range from 0.10 to 0.03, namely improving the center segregation and the center quality stability; the density of the central area of the casting blank is controlled to be 0.91-0.95, which is superior to 0.89-0.90 of the density of the central area of the casting blank produced by the conventional process.
Example 3
In the embodiment, a steel mill adopts the method of the invention to produce a continuous casting bloom of U78CrV series heavy rail steel with a section of 320mm multiplied by 410 mm.
The specific implementation conditions are as follows: (1) and differentiating the coverage areas of the wide and narrow surfaces of the second cooling section, wherein the wide surface starts from 900mm away from the liquid level of the crystallizer to 7500mm away from the liquid level of the crystallizer, and the narrow surface starts from 900mm away from the liquid level of the crystallizer to 12000mm away from the liquid level of the crystallizer. The regions from 900mm away from the crystallizer liquid level to 7500mm away from the crystallizer liquid level of the wide surface and the narrow surface are divided into two-cooling one region to four regions, and the regions from 7500mm away from the crystallizer liquid level to 12000mm away from the crystallizer liquid level of the narrow surface are used as two-cooling five regions. (2) Water distribution is as follows: the wide and narrow surfaces of the first area are 14-15 percent respectively; the wide surface of the second zone is 13 percent, and the narrow surface is 9 percent; the three-region wide face is 12 percent, and the narrow face is 9 percent; the wide surface of the fourth area is 7 percent, and the narrow surface is 11 percent; and 9% -10% of the narrow surface of the five regions, and distributing the total water amount, wherein the specific water amount is 0.28-0.32L/kg of steel. (3) A combined electromagnetic stirring technology is adopted, wherein the combined electromagnetic stirring technology comprises a crystallizer electromagnetic stirrer and a secondary cooling electromagnetic stirrer, and the secondary cooling electromagnetic stirrer is arranged 5000mm away from the liquid level of the crystallizer. The current intensity of the electromagnetic stirrer of the crystallizer is 50A, and the current frequency is 2.4 Hz; the solidification end electromagnetic stirring current intensity is 350A, and the frequency is 7.0 Hz. (4) And (3) adopting solidification tail end pressing, wherein the pressing is carried out by taking the position of the solidus line of the solidified shell as a reference point, the three groups of rollers in front of the reference point and the two groups of rollers behind the reference point, the total pressing amount is controlled to be 13-14 mm, and the pressing amounts of the rollers are 13-15%, 16%, 20%, 25% and 25-30% in sequence along the blank drawing direction. (5) On the basis of realizing width and thickness direction cooling cooperation and efficient solidification by differential coverage and forced cooling of the wide and narrow surfaces of a casting blank in the continuous casting process, an induction heating device is installed in the area 500-3500 mm in front of a pulling and straightening section to supply heat to the casting blank, and the temperature of the casting blank is increased to the plastic temperature area for pulling and straightening so as to avoid cracks in the pulling and straightening process. (6) The method is carried out by matching with other continuous casting processes, and the casting superheat degree is 20-30 ℃; the continuous casting speed is 0.68-0.72 m/min.
Besides the above key technical points, the present invention needs to be implemented according to requirements, and other continuous casting system processes are required to be implemented according to conventional implementation.
Carrying out section corrosion on a test casting blank, and carrying out semi-macrosegregation area ratio statistics on a corrosion sample, wherein the semi-macrosegregation area ratio is controlled to be 0.22-0.23% (the control level of the casting blank produced by the common process is 0.37-0.41%); carrying out center segregation chemical inspection (the sampling size is phi 5mm) on a longitudinal sample of the casting blank, controlling the center segregation degree of the C element to be 1.09-1.12, reducing the segregation degree to 0.05 compared with the casting blank produced by the common process, and reducing the segregation degree range from 0.10 to 0.03, namely improving the center segregation and the center quality stability; the density of the central area of the casting blank is controlled to be 0.93-0.95, which is superior to 0.89-0.92 of the density of the central area of the casting blank produced by the conventional process.
The above embodiment illustrates that, after the technology is adopted, the center quality of continuous casting rectangular blanks of 280mm × 380mm section heavy rail steel, 320mm × 410mm heavy rail steel and 360mm × 450mm section crankshaft steel is obviously improved, the macrosegregation and semi-macrosegregation control of the center region is obviously optimized, and the center density of large section rectangular blank casting blanks is obviously improved. The technology provides important technical guarantee for high-quality production of large-section rectangular continuous casting billets.
This document is intended to explain how to fashion the disclosed technology and various embodiments in a manner that is not intended to limit the true, intended, and fair scope and spirit thereof. Moreover, the foregoing description is not intended to be exhaustive or to limit the scope to the precise form disclosed. Modifications and variations are possible in light of the above teachings. The embodiments were chosen and described to provide the best illustration of the principles of the described technology and its practical application, and to enable one of ordinary skill in the art to utilize the disclosed technology in various modifications as are suited to the particular use contemplated. Accordingly, variations and modifications of the above-described embodiments, without departing substantially from the spirit and principles of the technology described herein, are intended to be included within the scope of the present disclosure.
Claims (10)
1. A method for improving the center quality of a large-section rectangular continuous casting billet is characterized by comprising the following steps:
setting a first area aiming at the wide surface of a casting blank;
setting a second region for a narrow surface of the casting blank, wherein the first region and the second region respectively comprise at least one subarea;
different water distribution schemes are configured for each zone.
2. The method according to claim 1, wherein said first zone starts at a first distance from the crystallizer liquid level and ends at a second distance from the crystallizer liquid level, and said second zone starts at a first distance from the crystallizer liquid level and ends at a third distance from the crystallizer liquid level.
3. The method of claim 2, wherein the first distance is 800-1000 mm, the second distance is 6000-8000 mm, and the third distance is 10000-12000 mm.
4. The method of claim 3, wherein the first distance is 900mm, the second distance is 7500mm, and the third distance is 11000 mm.
5. The method of claim 1, wherein the first zone and the second zone are located in a secondary cooling zone and each comprises a first partition, a second partition, a third partition, and a fourth partition, and the second zone further comprises a fifth partition.
6. The method of claim 5, wherein the first zone of the first zone is between 14% and 16% water dispensed, the second zone of the first zone is between 12% and 14% water dispensed, the third zone of the first zone is between 11% and 13% water dispensed, and the fourth zone of the first zone is between 5% and 7% water dispensed; the water distribution scheme of the first area of the second area is 14% -16% of water distribution, the water distribution scheme of the second area is 9% -11% of water distribution, the water distribution scheme of the third area of the second area is 9% -11% of water distribution, the water distribution scheme of the fourth area of the second area is 8% -11% of water distribution, and the water distribution scheme of the fifth area of the second area is 8% -10% of water distribution.
7. The method of claim 1, further comprising:
and arranging a second cooling electromagnetic stirrer at a fourth distance from the liquid level of the crystallizer, wherein the fourth distance is 5000-6000 mm.
8. The method of claim 7, further comprising:
and arranging induction heating equipment at a fifth distance in front of the straightening area, wherein the fifth distance is 500-3500 mm.
9. The method of claim 1, further comprising:
setting the position of the solidified shell solidus line reaching the center as a reference point;
and carrying out tail end pressing on one or more groups of rollers before and after the reference point.
10. The method of claim 9, wherein the applying of the set tip hold down to one or more sets of rollers before and after the reference point comprises:
and performing tail end pressing of the solidification section on the three groups of rollers before the reference point and the two groups of rollers after the reference point, wherein the pressing amount of each roller is 10-15%, 15-20%, 25-30% and 15-30% in sequence along the blank drawing direction.
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