CN109706398B - Silicon steel and preparation method of silicon steel plate - Google Patents
Silicon steel and preparation method of silicon steel plate Download PDFInfo
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- CN109706398B CN109706398B CN201910142822.6A CN201910142822A CN109706398B CN 109706398 B CN109706398 B CN 109706398B CN 201910142822 A CN201910142822 A CN 201910142822A CN 109706398 B CN109706398 B CN 109706398B
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Abstract
The invention provides silicon steel, which comprises the following chemical components in percentage by weight: c is less than or equal to 0.06%, Si: 2.5 to 3.5 percent of Mn is less than or equal to 0.25 percent, S is less than or equal to 0.02 percent, P is less than or equal to 0.02 percent, Al is less than or equal to 1.20 percent, and the balance of Fe. A method for preparing a silicon steel plate comprises the following steps: preparing a blank: the chemical components are adopted for proportioning and are smelted into a blank; step 2: processing a blank; and step 3: heating before forging: comprises heating in a low temperature region and heating in a high temperature region; and (3) heating in a low-temperature area: heating the blank to 800-850 ℃, and preserving heat; heating a high-temperature area: heating the blank to 1250-1270 ℃, and preserving heat; and 4, step 4: hot forging: widening and drawing out the blank, wherein the pressing amount in the thickness direction is 36-40%. After the temperature rise is finished, hot forging in the thickness direction is carried out, so that the problem of poor compactness of the smelted blank can be effectively solved, and the mechanical property is provided. The problem of loose structure in the traditional rolled silicon steel plate is solved, and meanwhile, the thickness is large, so that the rolled silicon steel plate can be used for processing various parts and is not limited to a thin plate.
Description
Technical Field
The invention relates to the field of steel manufacturing, in particular to silicon steel and a preparation method of a silicon steel plate.
Background
Silicon steel is used as a functional material with special purposes, has wide application in the industries of electronics, electric power, military industry and the like, has complex production process and strict manufacturing technology, and is generally rolled into a steel plate by a steel mill in the current scientific and technological field and then used.
The traditional rolling method comprises hot rolling and cold rolling, but the thickness of the plate is below 1mm, the large silicon steel plate produced by the traditional rolling production method has poor mechanical property and compactness, and the production method is also greatly limited. At present, various parts made of silicon steel are required more and more, the requirements on the performance of the parts are higher and higher, and the requirements of the traditional silicon steel products and the process are difficult to meet.
In view of the prior art, a method for preparing silicon steel and a plate thereof is provided to solve the above problems.
Disclosure of Invention
The invention aims to provide a silicon steel and a preparation method of a plate thereof, and the performance of the silicon steel is improved by forging a silicon steel smelting blank with a new formula.
The technology adopted by the invention is as follows:
silicon steel comprises the following chemical components in percentage by weight: c is less than or equal to 0.06%, Si: 2.5 to 3.5 percent of Mn is less than or equal to 0.25 percent, S is less than or equal to 0.02 percent, P is less than or equal to 0.02 percent, Al is less than or equal to 1.20 percent, and the balance of Fe. The formula is the basis for determining the material performance, and the silicon steel in the invention adopts the mixture ratio for proportioning and smelting. The silicon steel plate adopting the formula has large and more austenite grains after heat treatment, overcomes the problem of loose structure in the traditional rolled silicon steel plate, has large thickness, can be used for processing various parts, and is not limited to thin plates.
A preparation method of a silicon steel plate comprises the following process steps: step 1: preparing a blank: the chemical components are adopted for proportioning and are smelted into a blank; step 2: blank treatment: polishing and finishing the surface of the blank to prepare a square blank; and step 3: heating before forging: comprises heating in a low temperature region and heating in a high temperature region; and (3) heating in a low-temperature area: heating the blank to 800-850 ℃, and preserving heat; heating a high-temperature area: heating the blank to 1250-1270 ℃, and preserving heat; and 4, step 4: hot forging: widening and drawing out the blank, wherein the pressing amount in the thickness direction is 36-40%. The forging can eliminate the defects of as-cast porosity and the like generated in the smelting process of metal, optimize the microstructure, and simultaneously, the mechanical property of the forging is generally superior to that of a casting made of the same material due to the preservation of a complete metal streamline. Therefore, the hot forging in the thickness direction is performed after the temperature rise is completed, so that the problem of poor compactness of the melted blank can be effectively solved, and the mechanical performance can be provided.
As a further optimization of the scheme, the low-temperature region temperature rise comprises the following steps: step 3-1: raising the temperature to a first temperature point by free power, and carrying out primary heat preservation; step 3-2: heating to a second temperature point, and carrying out secondary heat preservation; step 3-3: heating to a third temperature point, and carrying out third heat preservation; the third temperature point is greater than the second temperature point, and the second temperature point is greater than the first temperature point. Since silicon steel sheets have a high silicon content and poor thermal conductivity, heating must be performed slowly, especially in a low temperature region.
In the step 3-2 and the step 3-3, the temperature rise speed is less than or equal to 80 ℃/h, and the heat preservation time of the first heat preservation, the second heat preservation and the third heat preservation is 2-4 h.
As further optimization of the scheme, the first temperature point is 200-210 ℃, the second temperature point is 500-520 ℃, and the third temperature point is 800-850 ℃.
As a further optimization of the scheme, the hot forging comprises the following steps: step 4-1: widening: pressing down the blank by an anvil in the thickness direction, wherein the pressing down amount is 18-20% of the thickness, the initial forging temperature of the blank is 1250-1270 ℃, and the final forging temperature is more than or equal to 850 ℃; step 4-2: drawing out: and returning the widened blank to the furnace to raise the temperature, and adopting an anvil to press down the blank in the thickness direction, wherein the pressing amount is 18-20% of the thickness, the initial forging temperature of the blank is 1250-1270 ℃, and the final forging temperature is more than or equal to 850 ℃.
As further optimization of the scheme, the temperature rise of the high-temperature zone comprises fourth heat preservation, and the heat preservation time is more than or equal to 4 hours.
As a further optimization of the scheme, the method also comprises the following steps of 4-3: after widening and drawing, leveling and straightening by using a large flat anvil, wherein the blank temperature is 850-1270 ℃, and the temperature needs to be raised when the temperature is lower than 850 ℃.
And as further optimization of the scheme, the remelting temperature rise comprises fifth heat preservation, and the heat preservation time is more than or equal to 3 hours.
Compared with the prior art, the invention has the beneficial effects that:
the silicon steel plate produced by the technical scheme enhances the flexibility of part forming, enriches the types of parts, is not limited to thin plate parts any more, increases the compactness of the parts, eliminates the looseness of raw materials and enhances the comprehensive mechanical property of the parts.
By adopting a reasonable heating process before forging, the internal and external temperatures of the blank before forging are ensured to be uniform, the control of stress in the forging process is ensured, and the quality after forging is improved.
Drawings
FIG. 1 is a schematic diagram of a pre-forging temperature rise curve of a method for preparing silicon steel and a plate thereof provided by the invention;
FIG. 2 is a schematic view of a tempering temperature-rise curve of the method for preparing silicon steel and the plate thereof provided by the invention.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Example 1:
silicon steel comprises the following chemical components in percentage by weight: c is less than or equal to 0.06%, Si: 2.5 to 3.5 percent of Mn is less than or equal to 0.25 percent, S is less than or equal to 0.02 percent, P is less than or equal to 0.02 percent, Al is less than or equal to 1.20 percent, and the balance of Fe.
The silicon added into the silicon steel mainly has the effects of improving the resistivity, reducing the eddy current loss, the coercive force and the hysteresis loss, and further reducing the iron loss. When the content of silicon is less than or equal to 3.5 percent, the yield strength and the tensile strength of the silicon steel are obviously improved due to the increase of the silicon content, but when the content of silicon is more than 3.5 percent, the yield strength and the tensile strength are rapidly reduced along with the increase of the silicon content, and the silicon steel formula is mainly used for plates with larger thickness and used as processing blanks of parts and components and has higher mechanical properties, so the silicon content is controlled to obtain higher yield strength and tensile strength, the closer to 3.5 percent, the better the silicon content is, but the smelting process has larger influence on the content of each element and is preferably controlled to be 2.5-3.5 percent.
Carbon element is a harmful element in silicon steel, and the increase of carbon content can improve the coercive force of a silicon steel sheet, cause the increase of iron loss and the reduction of magnetism. Carbon is also an element that expands the gamma region, easily causing phase transformation, refining grains, and thus deteriorating magnetic properties. The presence of carbon in the graphite state in the steel has minimal impact on the magnetic properties. Considering that the silicon steel has certain decarburization capability in the subsequent hot forging and annealing processes, the carbon content of a smelting sample is 0.04-0.07 percent, so as to avoid the increase of the oxygen content and the gas amount in the steel and the deterioration of the quality of the steel. Therefore, the carbon content is preferably controlled to 0.06% or less.
Phosphorus is similar to silicon, so that the gamma region of the steel is reduced, the grain growth of the steel is promoted, the resistance is increased, the iron loss is reduced, and the electromagnetic performance is improved. The phosphorus content in steel is increased, and the magnetic induction is improved under a weak and medium magnetic field. The high magnetic-electric rate can be obtained by replacing silicon with phosphorus in the hot-rolled low-silicon steel. Phosphorus increases the cold brittleness of the steel, making cold working difficult, and therefore phosphorus should be removed as a harmful element in cold-rolled oriented silicon steel. The plate of the formula needs to be manufactured into parts through hot forging and cold machining, and the cold machining relates to various forming machining, so that the content of phosphorus is not excessively high and is preferably less than 0.02%.
Aluminum has similar effects to silicon, such as growing silicon steel sheet grains, promoting carbon graphitization and deoxidation. However, if the content of aluminum is high and alumina inclusions are formed, the magnetic property is deteriorated and the nozzle is nodulated at the time of casting. The plate prepared by the formula is expected to obtain a structure with relatively large grains, so that the aluminum content is relatively high, but can not exceed 1.2%, and the total content of silicon and aluminum is controlled to be about 4% suitably.
The harmfulness of sulfur to silicon steel not only causes hot brittleness of steel, but also is harmful to magnetism, the magnetic permeability is reduced, and the iron loss is obviously increased. Manganese reacts with sulfur to form MnS, which mainly plays a role in reducing sulfur in steel. When the manganese content is high, the magnetic properties of the silicon steel sheet are deteriorated. The manganese content is controlled below 0.35% in traditional silicon steel, and considering that the sulfur content in the formula is below 0.02%, the manganese content needs to be further reduced to below 0.25%.
The silicon steel plate adopting the formula has large and more austenite grains after hot forging and heat treatment, overcomes the problem of loose structure in the traditional rolled silicon steel plate, has large thickness, can be used for processing various parts, and is not limited to thin plates.
Example 2:
referring to fig. 1 and 2, in the present embodiment, a silicon steel plate with a larger thickness is prepared by using the formula provided in embodiment 1.
A preparation method of a silicon steel plate comprises the following process steps: step 1: preparing a blank: the chemical components in the embodiment 1 are adopted for proportioning and are smelted into a blank; step 2: blank treatment: polishing and finishing the surface of the blank to prepare a square blank; and step 3: heating before forging: comprises heating in a low temperature region and heating in a high temperature region; and (3) heating in a low-temperature area: heating the blank to 800-850 ℃, and preserving heat; heating a high-temperature area: heating the blank to 1250-1270 ℃, and preserving heat; and 4, step 4: hot forging: widening and drawing out the blank, wherein the pressing amount in the thickness direction is 36-40%.
In the prior art, products based on silicon steel are basically only in the form of continuous casting billets and silicon steel sheets (thickness less than 1 mm), produced by hot or cold rolling, and are basically in the blank stage in the field of producing silicon steel sheets or parts with large thickness. Based on the needs of such products, the invention provides a method for processing plates by using a high-temperature forging mode, so that the structure of a smelted blank is more compact, and the mechanical property of the smelted blank is improved.
The traditional thin silicon steel plate directly rolls the blank after smelting, so that the performance is poor and the application field is narrow. The invention provides a method for improving the performance of a silicon steel plate and improving the compactness by forging. In this embodiment, a natural gas furnace is used to heat the blank before forging, so that the blank is suitable for hot forging; in the heating process, a multi-section heat preservation mode is adopted to heat up to 800 ℃ which is the lowest requirement of hot forging, the multi-section heating is adopted to ensure that the inside and outside temperature of the blank is uniform, the thermal stress is reduced, the uniform stress deformation in the forging process is ensured, and the residual stress is reduced. Meanwhile, the forging can eliminate the defects of as-cast porosity and the like generated in the smelting process of metal, optimize the microstructure, and simultaneously, the mechanical property of the forging is generally superior to that of a casting made of the same material due to the preservation of a complete metal streamline. Therefore, the hot forging in the thickness direction is performed after the temperature rise is completed, so that the problem of poor compactness of the melted blank can be effectively solved, and the mechanical performance can be provided.
In the forging apparatus of this embodiment, the hydraulic press and the anvil are used for widening and drawing, since upsetting is more advantageously performed in the width direction than in the length direction, widening is considered at first when forging the first fire, and then drawing, trimming and leveling are performed on the second fire.
As a further optimization of the scheme, the low-temperature region temperature rise comprises the following steps: step 3-1: raising the temperature to a first temperature point by free power, and carrying out primary heat preservation; step 3-2: heating to a second temperature point, and carrying out secondary heat preservation; step 3-3: heating to a third temperature point, and carrying out third heat preservation; the third temperature point is greater than the second temperature point, and the second temperature point is greater than the first temperature point. In the step 3-2 and the step 3-3, the temperature rising speed is less than or equal to 80 ℃/h, and the heat preservation time of the first heat preservation, the second heat preservation and the third heat preservation is 2-4 h. Since silicon steel sheets have a high silicon content and poor thermal conductivity, heating must be performed slowly, especially in a low temperature region.
When a heating and subsequent heat treatment process is formulated, because the poor heat-conducting property of the silicon steel is considered, according to the specific size of a blank, in order to reduce the internal stress during heating, a stepped heating method is adopted, and the heating speed of keeping the temperature at a low temperature region and being less than or equal to 80 ℃/h is adopted, so that the internal stress is reduced in a region with poor plastic region of the material. Practice production proves that the heating process ensures the forging quality of the product. If a greater heating rate is used during heating, the occurrence of heating cracks may result.
In the heating before forging, the high temperature time cannot be overlong, the overlong time easily causes overlarge crystal grain growth, the mechanical property is poor, the high temperature time is too short, the temperature difference exists inside and outside, and the stress exists, so that the control of the heat preservation time and the temperature rise rate by the particles is the key for ensuring the forging quality. Therefore, when the temperature is raised in a high-temperature area, the maximum common rate of heating equipment is adopted for heating, the heating speed is higher, the degree of superheat is higher, the actual forming temperature of austenite is higher, the increase of the nucleation rate is larger than the growth rate, and the austenite grains are moderate in size. And the temperature of the blank before forging is uniform through short-time heat preservation.
As further optimization of the scheme, the first temperature point is 200-210 ℃, the second temperature point is 500-520 ℃, and the third temperature point is 800-850 ℃. The transformation point of steel at 800 ℃ needs to be heated at high temperature quickly after the heat preservation at 800 ℃.
As a further optimization of the scheme, the hot forging comprises the following steps: step 4-1: widening: pressing down the blank by an anvil in the thickness direction, wherein the pressing down amount is 18-20% of the thickness, the initial forging temperature of the blank is 1250-1270 ℃, and the final forging temperature is more than or equal to 850 ℃; step 4-2: drawing out: and returning the widened blank to the furnace to raise the temperature, and adopting an anvil to press down the blank in the thickness direction, wherein the pressing amount is 18-20% of the thickness, the initial forging temperature of the blank is 1250-1270 ℃, and the final forging temperature is more than or equal to 850 ℃.
The forging process carries out twice pressing, the pressing amount of each time is 20% of the thickness, the selection is that the pressing amount of 20% of the thickness of each time just meets the size requirement of a forging piece, more importantly, the pressing amount of about 20% of each time ensures the forging penetration of the forging, the loose elimination in raw materials is ensured, and the compactness of the forging piece is ensured.
If a larger reduction is adopted, firstly, the dimension of the forging is not ensured, and secondly, larger work hardening is caused by the larger reduction to cause the generation of the forging crack; if the reduction is small, the forge piece cannot be fully forged, and the internal looseness cannot be eliminated.
As further optimization of the scheme, the temperature rise of the high-temperature zone comprises fourth heat preservation, and the heat preservation time is more than or equal to 4 hours. In the examples a 6 hour incubation time was used to ensure temperature uniformity.
As a further optimization of the scheme, the method also comprises the following steps of 4-3: after widening and drawing, leveling and straightening by using a large flat anvil, wherein the blank temperature is 850-1270 ℃, and the temperature needs to be raised when the temperature is lower than 850 ℃. And if the drawing is finished and the temperature is lower than the final forging temperature, the subsequent operations of trimming, leveling, straightening and the like can be performed after recalling and heating.
And as further optimization of the scheme, the remelting temperature rise comprises fifth heat preservation, and the heat preservation time is more than or equal to 3 hours. Because the blank is heated by the first fire, the external temperature of the blank is reduced firstly when the blank is cooled, and therefore the heat preservation time does not need to be as long as that of the first fire.
The following is a practical operation flow of forging, and the blank size before forging in the example is as follows: 2100mm 1160mm 220 mm.
First fire, i.e. heating of the blank from ambient temperature, (for widening): the length of the blank is unchanged, the blank is discharged after the blank is kept at the temperature of 1260 ℃ or below, the forging is started, the blank is clamped in the thickness direction by a hydraulic operating machine, an anvil for forging selects 1500mm x 400mm, the length direction of the anvil is the same as the length direction of the blank, in order to prevent oxide skin from being embedded into a forging body, the surface of the blank is lightly pressed, oxide skin is removed, the oxide skin is removed, impurities after the oxide skin is removed and the oxidation are prevented from being compressed, the integral performance is influenced, then the anvil is fully used for separately forging at the middle part of one end of the blank, which is opposite to the clamping direction of a jaw of an operating vehicle, the pressing amount is about 45mm, the forging is sequentially carried out towards two sides, the forging is turned over at the part with the rest length, and: 2100mm 1370mm 175 mm. Then the forging stock is put into a heating furnace for heating.
And the second fire, namely reheating after the first fire is used for drawing out, rotating the anvil by 90 degrees (with the same width) to ensure that the length direction of the anvil is perpendicular to the length direction of the blank, drawing out from the middle part of the blank, wherein the rolling reduction is about 35mm, forging in the same way as the first fire until the effective size of the forging piece is 2500mm 1370mm 140mm, and changing the lower anvil of the anvil into a large flat anvil for flattening and straightening.
Through the forging, the blank is pressed down by 36-40% in the thickness direction, the compactness of the silicon steel plate is improved, and the mechanical property is improved. Before forging, the continuous casting billet is sampled and machined, and the macroscopic loose defect appears on the machining surfaces with different depths. After forging, the samples are taken from the forgings for mechanical processing, and no macroscopic defects are found. And performing dye check on the whole forged piece after machining, wherein no defect is displayed. From the comparison of the front and the back, the forging increases the compactness of the part and eliminates the looseness of the material.
According to the forging process, the blank is pressed down twice in the thickness direction, and the anvil is vertically exchanged twice, so that the structure is tighter, the traditional hot rolling is difficult to process the silicon steel plate with the thickness exceeding 100mm, and the thick silicon steel plate with excellent mechanical properties can be obtained by adopting the preparation method.
The forged silicon steel plate is subjected to external mechanical extrusion and natural cooling, certain stress exists inside the forged silicon steel plate, the grain growth size is not uniform enough, and although the performance of the forged silicon steel plate is obviously improved compared with that of the traditional rolled silicon steel plate, a space capable of being improved still exists.
The method can effectively improve austenitizing of internal crystal grains and eliminate thermal stress by carrying out heat treatment, namely annealing on the forged silicon steel plate, the annealing temperature rise curve in the implementation is similar to the temperature rise curve before forging, multi-section temperature rise and heat preservation of a low-temperature region are adopted, so that the internal temperature and the external temperature of the silicon steel plate are uniform, the temperature rise rate in the low-temperature region (less than 800 ℃) is less than or equal to 80 ℃/h, when the temperature rises to the annealing temperature at 800 ℃, free power heating is adopted and carried out according to the maximum power of equipment, and the temperature reduction rate is controlled to be less than or equal to 60 ℃/h after the heat preservation is finished. The annealed silicon steel plate eliminates stress generated by forging, has moderate and uniform growth of internal crystal grains, and effectively solves the problem of insufficient performance of the existing silicon steel product.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The silicon steel is characterized by comprising the following chemical components in percentage by weight: c is less than or equal to 0.06%, Si: 2.5-3.5 percent of Mn is less than or equal to 0.25 percent, S is less than or equal to 0.02 percent, P is less than or equal to 0.02 percent, Al is less than or equal to 1.20 percent, and the balance of Fe;
the method comprises the following process steps:
step 1: preparing a blank: the chemical components are adopted for proportioning and are smelted into a blank;
step 2: blank treatment: polishing and finishing the surface of the blank to prepare a square blank;
and step 3: heating before forging: comprises heating in a low temperature region and heating in a high temperature region; and (3) heating in a low-temperature area: heating the blank to 800-850 ℃, and preserving heat; heating a high-temperature area: heating the blank to 1250-1270 ℃, and preserving heat;
and 4, step 4: hot forging: widening and drawing out the blank, wherein the pressing amount in the thickness direction is 36-40%;
in step 3, the temperature rise in the low-temperature region comprises the following steps:
step 3-1: raising the temperature to a first temperature point by free power, and carrying out primary heat preservation;
step 3-2: heating to a second temperature point, and carrying out secondary heat preservation;
step 3-3: heating to a third temperature point, and carrying out third heat preservation; the third temperature point is greater than the second temperature point, which is greater than the first temperature point;
in the step 3-2 and the step 3-3, the temperature rising speed is less than or equal to 80 ℃/h, and the heat preservation time of the first heat preservation, the second heat preservation and the third heat preservation is 2-4 h; the first temperature point is 200-210 ℃, the second temperature point is 500-520 ℃, and the third temperature point is 800-850 ℃.
2. The method for manufacturing a sheet of silicon steel according to claim 1, characterized in that said hot forging comprises the following steps:
step 4-1: widening: pressing down the blank by an anvil in the thickness direction, wherein the pressing down amount is 18-20% of the thickness, the initial forging temperature of the blank is 1250-1270 ℃, and the final forging temperature is more than or equal to 850 ℃;
step 4-2: drawing out: and returning the widened blank to the furnace to raise the temperature, and adopting an anvil to press down the blank in the thickness direction, wherein the pressing amount is 18-20% of the thickness, the initial forging temperature of the blank is 1250-1270 ℃, and the final forging temperature is more than or equal to 850 ℃.
3. The method of manufacturing a silicon steel sheet as set forth in claim 2, wherein the raising of the temperature of the high temperature zone includes a fourth holding time of 4 hours or more.
4. The method for manufacturing a sheet of silicon steel according to claim 3, further comprising the steps of 4-3: after widening and drawing, leveling and straightening by using a large flat anvil, wherein the blank temperature is 850-1270 ℃, and the temperature needs to be raised when the temperature is lower than 850 ℃.
5. The method for manufacturing silicon steel sheet according to claim 2 or 4, wherein the returning and heating includes a fifth holding time, and the holding time is 3 hours or more.
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