CN115679064A - Method for manufacturing oriented electrical steel with excellent surface - Google Patents
Method for manufacturing oriented electrical steel with excellent surface Download PDFInfo
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- CN115679064A CN115679064A CN202211190178.8A CN202211190178A CN115679064A CN 115679064 A CN115679064 A CN 115679064A CN 202211190178 A CN202211190178 A CN 202211190178A CN 115679064 A CN115679064 A CN 115679064A
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Abstract
The invention provides a method for manufacturing oriented electrical steel with excellent surface, which belongs to the technical field of oriented electrical steel manufacturing, and comprises the steps of coating an additive after coating a separant on the oriented electrical steel; the oriented electrical steel strip comprises the following chemical components: from 0.0005 wt.% to 0.05 wt.% Bi; the coating of the release agent comprises: firstly, uniformly coating a separant on the surface of the strip steel, then dividing the surface of the strip steel from the edge to the middle along the width direction into a plurality of coating areas according to the distance from the edge to the edge of the strip steel, coating an additive on the coating areas, wherein the coating amount of the additive in the coating areas closer to the edge of the strip steel is more. The method realizes the differentiation adjustment of different areas by non-uniformly spraying the additive on the surface of the strip steel, so that the quality of the edge part and the middle part can reach the optimal state, thereby improving the surface quality of the oriented electrical steel.
Description
Technical Field
The application relates to the technical field of oriented electrical steel manufacturing, in particular to a method for manufacturing oriented electrical steel with excellent surface.
Background
Oriented silicon steel is a metal functional material, is mainly applied to the electric power industry, and is often praised as 'bright pearl on imperial crown' in the steel industry due to high technical difficulty, long manufacturing process and strict process requirements. Among them, the non-underlayer oriented electrical steel is mainly used as an extremely thin strip material, an iron core of a large-sized generator and a driving motor. When the magnesium silicate-based ultra-thin strip is used as a raw material of an ultra-thin strip, if a bottom layer containing magnesium silicate exists on the surface of the strip steel, the abrasion of a roller is increased in the rolling process, the bottom layer and a metal substrate are stripped due to different extension rates, the rolling precision is influenced, and the stripped bottom layer can pollute a rolling oil system; when the magnesium silicate punching die is used as a large generator and a driving motor iron core, if a magnesium silicate bottom layer exists on the surface of strip steel, the service life of the punching die is greatly damaged, and the punching times can be reduced from tens of thousands of times to thousands of times. Therefore, the non-primer oriented electrical steel requires no primer residue on the surface of the strip steel.
The traditional non-bottom oriented silicon steel is manufactured by adopting a technology of adjusting the formula of a separant, namely, characteristic elements causing the bottom to be loose are mixed into the separant in an additive mode, and the separant is uniformly coated on the surface of strip steel in a roll coating mode, so that the non-bottom layer in the main area of the strip steel can be realized. However, in the high-temperature annealing process, the steel coil is heated unevenly, and the reaction degrees of the bottom layers in different areas are different, so that the defect of bottom layer residue at the edge part is easy to occur while the control of the no bottom layer in the middle area of the width of the plate is good. In order to solve the problem of residual bottom layers of the edges, the traditional method is to optimize the way of adjusting the formula of the release agent and adjusting the process of the annular furnace, but the residual edges are relieved and the quality of the middle surface is damaged, so that a manufacturing enterprise of the non-bottom oriented electrical steel can only select to cut off the residual areas of the bottom layers of the edges and sacrifice the yield to ensure the delivery quality.
Disclosure of Invention
The embodiment of the application provides a method for manufacturing oriented electrical steel with excellent surface, which aims to solve the technical problems of residual bottom layers, large trimming amount and low yield of non-bottom oriented steel edges processed by the existing processing method coated with a release agent.
In a first aspect, embodiments of the present application provide a method for manufacturing an oriented electrical steel with a good surface, the method including applying a release agent to the oriented electrical steel and then applying an additive to the oriented electrical steel;
the oriented electrical steel strip comprises the following chemical components: from 0.0005 wt% to 0.05 wt% Bi;
the coating of the additive after the release agent comprises the following steps: firstly, uniformly coating a separant on the surface of the strip steel, then dividing the surface of the strip steel from the edge to the middle along the width direction into a plurality of coating areas according to the distance from the edge to the edge of the strip steel, coating an additive on the coating areas, wherein the coating amount of the additive in the coating areas closer to the edge of the strip steel is more.
Further, the coating area is divided into a first coating area, a second coating area and a third coating area, the third coating area is far away from the edge of the strip steel, the second coating area is far away from the edge of the strip steel, the first coating area is far away from the edge of the strip steel, the surface of the strip steel is uniformly coated with the additive, the second coating area is coated with the surface of the strip steel, the coating amount of the additive is gradually decreased along the width direction of the strip steel, and the surface of the strip steel is uniformly coated with the additive.
Further, the step of coating the additive on the surface of the steel strip in the second coating area, wherein the coating amount of the additive is gradually decreased from outside to inside along the width direction of the steel strip, comprises the following steps:
according to Wp and W 0 Coating additives on the surface of the strip steel in the second coating area in a descending trend along the width direction of the strip steel from outside to inside,
wherein Wp represents the distance between the coating site and the edge of the strip, W 0 Representing the actual edge residual width of the non-primer oriented electrical steel. Further, the step of coating the additive on the surface of the steel strip in the second coating area, wherein the coating amount of the additive is gradually decreased from outside to inside along the width direction of the steel strip, comprises the following steps:
applying an additive to the surface of the steel strip in the second coating zone from the boundary line with the first coating zone in a coating amount expressed by expression 1, wherein the second coating zone satisfies W 0 ≤W p ≤W 0 A region of + 200;
expression 1:
wherein m represents the coating amount, wp represents the distance between the coating position and the strip edge in mm, and W 0 The actual edge residual width of the non-bottom oriented electrical steel is expressed in mm, and m is a The coating amount of the first coating region is set to 15 to 50g/m 2 M is said to b The coating amount of the third coating zone is set to 11 to 27g/m 2 . Further, the step of uniformly coating the additive on the surface of the steel strip in the first coating area comprises the following steps:
the uniform coating quality of the surface of the strip steel in the first coating area is m a The additive of (1), the m a Set to 15 to 50g/m 2 ；
Wherein the first coating region is such that Wp < W 0 The region of (W) p Represents the distance of the coating position from the edge of the strip, W represents the width of the strip, W 0 Representing the actual edge residual width of the oriented electrical steel without the bottom layer, and
further, the uniformly coating the additive on the surface of the steel strip in the third coating area comprises the following steps:
the uniform coating quality of the surface of the strip steel in the third coating area is m b The additive of (1), the m b Set to 11 to 27g/m 2 (ii) a And m is a ＞m b ；
Wherein the third coating zone is such that
The region of (W) p Represents the distance of the coating position from the edge of the strip, W represents the width of the strip, W 0 Representing an actual edge residual width of the non-primer oriented electrical steel, and
further, the separant comprises silicon steel grade MgO and Al 2 O 3 The mass fraction of MgO in the mixture is 20-100%.
Further, the additive is formed by mixing a component A and water, wherein the component A is NaCl, KCl or MgCl 2 、ZnCl 2 、BaCl 2 、SrCl 2 、NH 4 Cl、MnCl 2 、CaCl 2 、BiOCl、SbOCl、Bi(NO 3 ) 2 、Cu(NO 3 ) 2 、NaNO 3 、NH 4 NO 3 At least one of; the concentration of the additive is 5-10%.
Furthermore, the particle diameter of the liquid drop coated by the additive is 10-300 mu m.
Further, said applying an additive to said coating region comprises:
and coating the coating area on the single-side and/or double-side surface of the steel strip with the additive.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the method for manufacturing the oriented electrical steel with the excellent surface, the Bi element is added into the oriented silicon steel, so that the formation of an oxide film can be inhibited in the decarburization annealing process, and SiO in the oxide film is changed 2 The form of the magnesium silicate alloy steel plate enables air permeability between steel plate layers to be poor during high-temperature annealing, meanwhile, bi diffuses from a steel plate matrix to the external atmosphere in the form of steam bubbles in the high-temperature annealing process, bi steam is not easy to escape due to poor air permeability between the steel plate layers, the Bi steam can corrode a magnesium silicate bottom layer generated on the surface layer of the steel plate matrix, and an interface between the steel plate matrix and the bottom layer is easy to expand, so that the magnesium silicate bottom layer is easy to peel off in the subsequent pickling process, and bottomless oriented silicon steel is formed after the magnesium silicate bottom layer is completely peeled off; the additive is coated on the strip steel in a non-uniform manner, so that the coating amount of the edge part of the strip steel is larger than that of the middle part of the strip steel, differential adjustment of different areas is realized, the quality of the edge part and the quality of the middle part of the strip steel reach the optimal state, the residue of the bottom layer is reduced, the trimming amount is reduced, and the yield is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic view of a strip steel spraying apparatus in a method for manufacturing a fine-surfaced oriented electrical steel according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the strip steel spraying positions and the corresponding spraying amounts in the method for manufacturing the oriented electrical steel with excellent surface according to the embodiment of the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The oriented electrical steel without bottom layer is mainly used as the iron core of ultrathin strip raw material, large-scale generator and driving motor. When the magnesium silicate-based ultra-thin strip is used as a raw material of an ultra-thin strip, if a bottom layer containing magnesium silicate exists on the surface of the strip steel, the abrasion of a roller is increased in the rolling process, the bottom layer and a metal substrate are stripped due to different expansion rates, the rolling precision is influenced, and the stripped bottom layer can pollute a rolling oil system; when the magnesium silicate punching die is used as a large generator and a driving motor iron core, if a magnesium silicate bottom layer exists on the surface of strip steel, the service life of the punching die is greatly damaged, and the punching times can be reduced from tens of thousands of times to thousands of times. Therefore, the non-primer oriented electrical steel requires no primer residue on the surface of the strip steel.
The traditional non-bottom oriented silicon steel is manufactured by adopting a technology of adjusting the formula of a separant, namely, characteristic elements causing the bottom to be loose are mixed into the separant in an additive mode, and the separant is uniformly coated on the surface of strip steel in a roll coating mode, so that the non-bottom in the main area of the strip steel can be realized. However, in the high-temperature annealing process, the steel coil is heated unevenly, and the reaction degrees of the bottom layers in different areas are different, so that the defect of bottom layer residue at the edge part is easy to occur while the control of the no bottom layer in the middle area of the width of the plate is good. In order to solve the problem of edge bottom layer residue, the traditional method adopts an optimization mode of adjusting the formula of an isolating agent and adjusting the process of an annular furnace, but the edge residue can cause damage to the surface quality of the middle part while being relieved, so that a non-bottom layer oriented electrical steel manufacturing enterprise can only select to cut off the edge bottom layer residue area and sacrifice the yield to ensure the delivery quality.
In view of the above, the present application provides a method for manufacturing an oriented electrical steel with a good surface, which can effectively solve the above-mentioned problems in the existing non-underlayer optimization method.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
the embodiment of the application provides a method for manufacturing oriented electrical steel with excellent surface, and aims to solve the technical problems of residue, large trimming amount and low yield of the bottom layer of the edge of the non-bottom oriented steel processed by the existing processing method.
In a first aspect, embodiments of the present application provide a method for manufacturing an oriented electrical steel with a good surface, the method applying a release agent to the oriented electrical steel and then applying an additive to the oriented electrical steel;
the oriented electrical steel strip comprises the following chemical components: from 0.0005 wt.% to 0.05 wt.% Bi;
the additive is coated after the release agent is coated, and the additive comprises: firstly, uniformly coating a separant on the surface of the strip steel, then dividing the surface of the strip steel from the edge to the middle along the width direction into a plurality of coating areas according to the distance from the edge to the edge of the strip steel, coating an additive on the coating areas, wherein the coating amount of the additive in the coating areas closer to the edge of the strip steel is more.
According to the method for manufacturing the oriented electrical steel with the excellent surface, the Bi element is added into the oriented silicon steel, so that the formation of an oxide film can be inhibited in the decarburization annealing process, and SiO in the oxide film is changed 2 The form of the magnesium silicate alloy steel plate enables the air permeability between steel plate layers to be poor during high-temperature annealing, meanwhile, bi diffuses from a steel plate matrix to the external atmosphere in the form of steam bubbles during the high-temperature annealing, bi steam is not easy to escape due to the poor air permeability between the steel plate layers, the generated magnesium silicate bottom layer on the surface layer of the steel plate matrix can be corroded, and the interface between the steel plate matrix and the bottom layer is easy to expand, so that the magnesium silicate bottom layer is easy to peel off during the subsequent pickling process, and the non-bottom oriented silicon steel is formed after the magnesium silicate bottom layer is completely peeled off; and the coating amount of the edge part of the strip steel is larger than that of the middle part of the strip steel by coating the additive on the strip steel in a non-uniform way,the method realizes the differentiated adjustment of different areas, so that the quality of the edge part and the middle part can reach the best state, the residue of the bottom layer is reduced, the trimming amount is reduced, and the yield is improved.
It should be noted that, as shown in fig. 1, the application of the additive of the present invention may be performed before the drying furnace, after the drying furnace, or before and after the drying furnace. The method for manufacturing the oriented electrical steel further comprises steel making, hot rolling, normalizing annealing, cold rolling, decarburization and nitridation annealing, high-temperature annealing, stretching and leveling annealing and insulating coating, the processes all adopt the prior art, and redundant description is not given in the application.
As an implementation manner of the embodiment of the present invention, the coating area is divided into a first coating area, a second coating area and a third coating area, the third coating area is farther from the edge of the strip than the second spraying area, the second coating area is farther from the edge of the strip than the first coating area, the additive is uniformly coated on the surface of the strip in the first coating area, the additive is coated on the surface of the strip in the second coating area, the coating amount of the additive decreases from outside to inside along the width direction of the strip, and the additive is uniformly coated on the surface of the strip in the third coating area.
In this application, belted steel limit portion bottom remains heaviest, and middle part bottom quality is the best, through carrying out coating volume gradual change setting in second coating district, can make limit portion and middle part quality all reach the optimum, and can avoid the coating of linear type limit portion to form corresponding boundary line on the finished product, influence the product apparent quality, is difficult for being accepted by the user.
As an implementation manner of the embodiment of the present invention, the applying the additive to the surface of the steel strip in the second applying area and the applying amount of the additive is gradually decreased from outside to inside along the width direction of the steel strip includes:
according to Wp and W 0 Coating additives on the surface of the strip steel in the second coating area in a descending trend along the width direction of the strip steel from outside to inside,
wherein Wp represents the distance between the coating site and the edge of the strip, W 0 Representing the actual edge residual width of the non-primer oriented electrical steel.
As an implementation manner of the embodiment of the present invention, the applying the additive to the surface of the steel strip in the second applying area and the applying amount of the additive is gradually decreased from outside to inside along the width direction of the steel strip includes:
applying an additive to the surface of the steel strip in the second coating zone from the boundary line with the first coating zone in a coating amount expressed by expression 1, wherein the second coating zone satisfies W 0 ≤W p ≤W 0 A +200 region;
expression 1:
wherein m represents the coating amount, wp represents the distance between the coating position and the strip edge in mm, and W 0 The residual width of the actual edge part of the non-bottom oriented electrical steel is in mm, and m is a The coating amount of the first coating region is set to 15 to 50g/m 2 M is said b The coating amount of the third coating zone is set to 11 to 27g/m 2 。
In the application, the coating amount is too small, the content of characteristic elements is low, and the effects of loosening the bottom layer and improving the residual defect of the bottom layer cannot be achieved; if the coating amount is too large, the damage effect of special elements on the bottom layer is too violent, the protective effect of the bottom layer on precipitates in the steel plate is reduced, so that the precipitates are quickly cured in advance, and the magnetic property is deteriorated. Therefore, the coating amount must be controlled within a reasonable range.
The amount of the second coating zone is to ensure that the board width minor edge meets the quality requirements and has no obvious visible boundary marks with the edges of the first and third spraying zones. The area 200mm away from the residual area of the edge part is selected for gradual coating, so that the boundary line can be effectively prevented, and the central area can be ensured to be in the optimal state.
As an implementation manner of the embodiment of the present invention, the uniformly coating the additive on the surface of the steel strip in the first coating area comprises:
the uniform coating quality of the surface of the strip steel in the first coating area is m a The additive of (1), the m a Set to 15 to 50g/m 2 ；
Wherein the first coating region is such that Wp < W 0 The region of (A), the W p Represents the distance of the coating position from the edge of the strip, W represents the width of the strip, W 0 Representing the actual edge residual width of the non-primer oriented electrical steel, and
in this application, the amount in first spraying region is in order to guarantee that board broadside portion accords with the requirement for quality.
As an implementation manner of the embodiment of the present invention, the uniformly coating the surface of the steel strip in the third coating area with the additive includes:
the uniform coating quality of the surface of the strip steel in the third coating area is m b The additive of (1), the m b Set to 11 to 27g/m 2 (ii) a And m is a ＞m b ；
Wherein the third coating zone is such that
The region of (W) p Represents the distance of the coating position from the edge of the strip, W represents the width of the strip 0 Representing an actual edge residual width of the non-primer oriented electrical steel, and
in this application, the amount of third spraying area is the assurance board width middle part and accords with the requirement for quality.
As an implementation mode of the embodiment of the invention, the components of the separant are silicon steel grade MgO and Al 2 O 3 The mass fraction of MgO in the mixture is 20-100%.
As an implementation mode of the embodiment of the invention, the additive is formed by mixing the component A and water, wherein the component A is NaCl, KCl or MgCl 2 、ZnCl 2 、BaCl 2 、SrCl 2 、NH 4 Cl、MnCl 2 、CaCl 2 、BiOCl、SbOCl、Bi(NO 3 ) 2 、Cu(NO 3 ) 2 、NaNO 3 、NH 4 NO 3 At least one of; the concentration of the additive is 5-10%.
In the present application, the additive is Cl - Or NO3 - Or a compound capable of reacting with H + The ions forming acidic compounds, by formation of HCl or HNO during high temperature annealing 3 And corroding the bottom layer in an acidic atmosphere to loosen the bottom layer, wherein acid liquid is easy to intrude into the bottom layer during subsequent pickling, so that the bottom layer can be conveniently stripped from the steel plate substrate. The concentration of the additive is too low, the required spray amount is too large, the strip steel is not easy to dry, the moisture introduced into the strip steel is too much, and the defect of water vapor printing is easily generated; the concentration of the additive is too high, the carrier solution is too little, the phenomenon of uneven spraying is easy to occur, and the reaction shows point defects on the finished product. Therefore, the additive concentration value should be within a suitable range.
As an implementation mode of the embodiment of the invention, the particle diameter of the droplets coated by the additive is 10-300 μm.
In the application, the particle size of the liquid drops coated by the additive is too small, and the liquid drops are easy to suspend in the environment and cannot reach the surface of the strip steel under the action of high-speed running of the strip steel; the phenomenon of uneven coating is easy to occur due to overlarge particle size of liquid drops, and the surface of the strip steel is easy to form point defects. The coating effect is optimized by controlling the size of the droplets of the additive.
As an implementation of the embodiment of the present invention, the applying an additive to the coating area includes:
and coating the coating area on one surface and/or two surfaces of the steel strip with the additive.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental methods without specifying specific conditions in the following examples were generally determined according to national standards. If there is no corresponding national standard, it is carried out according to the universal international standard, the conventional conditions, or the conditions recommended by the manufacturer.
Example 1
The embodiment provides a method for manufacturing oriented electrical steel with excellent surface, which specifically comprises the following steps: the casting blank is heated by a high-temperature annealing furnace at 1150 ℃, hot-rolled to 2.5mm, annealed in a normalizing furnace in two sections, and then cold-rolled to 0.23mm. And then, the strip steel is subjected to decarburization and nitridation annealing, the whole plate surface is uniformly coated with a separant (MgO slurry), an additive is sprayed and coiled in sequence, then the steel coil is changed from a horizontal type to a vertical type, enters a high-temperature annealing furnace for annealing at the maximum of 1200 ℃, and is discharged out of the furnace and subjected to stress relief annealing and insulating coating by a hot stretching leveling unit.
Wherein, the additive is sprayed on one side of the upper surface of the strip steel along the width direction of the strip steel, and the spraying amount is m (g/m) 2 ) Is calculated by the formula
Wherein, wp represents the distance between the spraying position and the edge of the strip steel, and the unit is mm;
the isolating agent is composed of NaCl 2 And BiOCl in a mass ratio of 7:3 and dissolving in water again after mixing, wherein the concentration of the mixture is 8 percent.
The low-temperature high-magnetic-induction oriented silicon steel used in the embodiment comprises the following chemical components in percentage by mass: c:0.052%, si:3.0%, mn:0.08%, S:0.010%, als:0.0245%, N:0.0099%, bi:0.0045%, sn:0.20%, cr:0.05%, cu:0.25%, and the balance of Fe and unavoidable impurity elements.
Example 2
The embodiment provides a method for manufacturing oriented electrical steel with excellent surface, which specifically comprises the following steps: the casting blank is heated by a high-temperature annealing furnace at 1150 ℃, hot rolled to 2.5mm, annealed in a normalizing annealing furnace in two sections, and then cold rolled to 0.23mm. And then, the strip steel is subjected to decarburization and nitridation annealing, the whole plate surface is uniformly coated with a separant (MgO slurry), an additive is sprayed and coiled in sequence, then the steel coil is changed from a horizontal type to a vertical type, enters a high-temperature annealing furnace for annealing at the maximum of 1200 ℃, and is discharged out of the furnace and subjected to stress relief annealing and insulating coating by a hot stretching leveling unit.
Wherein the additive is sprayed on the upper surface and the lower surface of the strip steel along the width direction of the strip steel on two sides, and the spraying amount is m (g/m) 2 ) Is calculated by the formula
Wherein, wp represents the distance between a spraying position and the edge of the strip steel, and the unit is mm;
the separant is composed of MgCl 2 SbOCl and NH 4 NO 3 According to the mass ratio of 1:2:7 and then dissolved in water again, the concentration of which is 7 percent.
The low-temperature high-magnetic-induction oriented silicon steel used in the embodiment comprises the following chemical components in percentage by mass: c:0.052%, si:3.0%, mn:0.08%, S:0.010%, als:0.0245%, N:0.0099%, bi:0.0005%, sn:0.20%, cr:0.05%, cu:0.25%, and the balance of Fe and unavoidable impurity elements.
Example 3
The embodiment provides a method for manufacturing oriented electrical steel with excellent surface, which comprises the following steps: the casting blank is heated by a high-temperature annealing furnace at 1150 ℃, hot rolled to 2.5mm, annealed in a normalizing annealing furnace in two sections, and then cold rolled to 0.23mm. And then, the strip steel is subjected to decarburization and nitridation annealing, the whole plate surface is uniformly coated with a separant (MgO slurry), an additive is sprayed, and the strip steel is coiled, then a steel coil is changed from a horizontal type to a vertical type, enters a high-temperature annealing furnace to be annealed at the maximum of 1200 ℃, and is discharged out of the furnace and is subjected to stress relief annealing and insulating coating by a hot stretching leveling unit.
Wherein, the additive is sprayed on one side of the lower surface of the strip steel along the width direction of the strip steel, and the spraying amount is m (g/m) 2 ) Is calculated by the formula
Wherein, wp represents the distance between a spraying position and the edge of the strip steel, and the unit is mm;
the isolating agent is ZnCl 2 、SrCl 2 And Cu (NO) 3 ) 2 According to the mass ratio of 3:2:5 after mixing, the mixture was dissolved in water again at a concentration of 8%.
The low-temperature high-magnetic-induction oriented silicon steel used in the embodiment comprises the following chemical components in percentage by mass: c:0.052%, si:3.0%, mn:0.08%, S:0.010%, als:0.0245%, N:0.0099%, bi:0.05%, sn:0.20%, cr:0.05%, cu:0.25%, and the balance of Fe and unavoidable impurity elements.
Comparative example 1
The spray additive of example 1 was eliminated and the same procedure as in example 1 was repeated.
Comparative example 2
The additive of example 1 was sprayed in an amount of m (g/m) 2 ) Instead, the method comprises the following steps:
Comparative example 3
The concentration of the additive in example 2 was changed to 20%, and the rest was the same as in example 2.
TABLE 1 effects of examples and comparative examples
In conclusion, the method for manufacturing the oriented electrical steel with the excellent surface provided by the invention adopts a sectional and gradual control mode aiming at the bottom generation characteristic of the oriented steel without the bottom layer, so that the differentiation adjustment of a defect area and a normal area can be effectively realized, the quality of the edge part and the middle part can reach the optimal state without the bottom layer, and the uniform quality of the plate surface is ensured.
It is noted that, 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. Also, 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. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above description is merely illustrative of particular embodiments of the invention that enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for manufacturing an oriented electrical steel having a good surface, the method comprising applying a release agent to the oriented electrical steel and then applying an additive thereto;
the oriented electrical steel strip comprises the following chemical components: from 0.0005 wt.% to 0.05 wt.% Bi;
the additive is coated after the release agent is coated, and the additive comprises: firstly, uniformly coating a separant on the surface of the strip steel, then dividing the surface of the strip steel from the edge to the middle along the width direction into a plurality of coating areas according to the distance from the edge to the edge of the strip steel, coating an additive on the coating areas, wherein the coating amount of the additive in the coating areas closer to the edge of the strip steel is more.
2. The method of manufacturing an oriented electrical steel having a superior surface according to claim 1, wherein the coating regions are divided into a first coating region, a second coating region and a third coating region, the third coating region is farther from the edge of the strip than the second coating region, the second coating region is farther from the edge of the strip than the first coating region, the additive is uniformly coated on the surface of the strip in the first coating region, the additive is coated on the surface of the strip in the second coating region, the coating amount of the additive decreases from the outside to the inside in the width direction of the strip, and the additive is uniformly coated on the surface of the strip in the third coating region.
3. The method for manufacturing the oriented electrical steel with excellent surface according to claim 2, wherein the step of coating the surface of the steel strip in the second coating area with the additive in a quantity that decreases from outside to inside along the width direction of the steel strip comprises:
according to Wp and W 0 Coating additives on the surface of the strip steel in the second coating area along the width direction of the strip steel in a descending trend,
wherein Wp represents the distance between the coating site and the edge of the strip, W 0 Representing the actual edge residual width of the underlayer-free oriented electrical steel.
4. The method of producing a surface-treated oriented electrical steel according to claim 2 or 3,
the coating of the additive on the surface of the strip steel in the second coating area and the coating amount of the additive are gradually decreased from outside to inside along the width direction of the strip steel, and the method comprises the following steps:
applying an additive to the surface of the steel strip in the second coating zone from the boundary line with the first coating zone in a coating amount expressed by expression 1, wherein the second coating zone satisfies W 0 ≤W p ≤W 0 A region of + 200;
expression 1:
wherein m represents the coating amount, wp represents the distance between the coating position and the strip edge in mm, and W 0 The actual edge residual width of the non-underlying oriented electrical steel is expressed in mm, and
m is a The coating amount of the first coating region is set to 15 to 50g/m 2 M is said b The coating amount of the third coating zone is set to 11 to 27g/m 2 。
5. The method of producing a surface-treated oriented electrical steel according to claim 2,
the step of uniformly coating the additive on the surface of the steel strip in the first coating area comprises the following steps:
the uniform coating quality of the surface of the strip steel in the first coating area is m a The additive of (1), the m a Set to 15 to 50g/m 2 ；
Wherein the first coating region is such that Wp < W 0 The region of (W) p Denotes the distance of the coating position from the edge of the strip, W denotes the width of the strip, W 0 Representing the actual edge residual width of the non-primer oriented electrical steel, and
6. the method of producing a surface-treated oriented electrical steel according to claim 2,
the step of uniformly coating the additive on the surface of the steel strip in the third coating area comprises the following steps:
the uniform coating quality of the surface of the strip steel in the third coating area is m b The additive of (1), the m b Set to 11 to 27g/m 2 (ii) a And m is a ＞m b ；
Wherein the third coating zone is such that
The region of (W) p Represents the distance of the coating position from the edge of the strip, W represents the width of the strip 0 Representing an actual edge residual width of the non-primer oriented electrical steel, and
7. the method of claim 1, wherein the release agent component is MgO and Al in the silicon steel grade 2 O 3 The mass fraction of MgO in the mixture is 20-100%.
8. The method for producing oriented electrical steel with excellent surface according to any one of claims 1 to 7, wherein the additive is prepared by mixing component A and water, wherein the component A is NaCl, KCl or MgCl 2 、ZnCl 2 、BaCl 2 、SrCl 2 、NH 4 Cl、MnCl 2 、CaCl 2 、BiOCl、SbOCl、Bi(NO 3 ) 2 、Cu(NO 3 ) 2 、NaNO 3 、NH 4 NO 3 At least one of; the concentration of the additive is 5-10%.
9. The method for producing an oriented electrical steel having a good surface according to claim 1, wherein the additive is applied so that the droplet size is 10 to 300 μm.
10. The method of manufacturing a fine-surfaced oriented electrical steel according to claim 1, wherein said applying an additive to said coating zone comprises:
and coating the coating area on the single-side and/or double-side surface of the steel strip with the additive.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116516133A (en) * | 2023-04-13 | 2023-08-01 | 首钢智新迁安电磁材料有限公司 | Oriented silicon steel with uniform grain structure and magnetic property and preparation method thereof |
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| CN116516133A (en) * | 2023-04-13 | 2023-08-01 | 首钢智新迁安电磁材料有限公司 | Oriented silicon steel with uniform grain structure and magnetic property and preparation method thereof |
| CN116516133B (en) * | 2023-04-13 | 2023-12-01 | 首钢智新迁安电磁材料有限公司 | Oriented silicon steel with uniform grain structure and magnetic property and preparation method thereof |
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