CN113058998A - Method for preventing hot-rolled edge crack of low-temperature heating oriented silicon steel - Google Patents
Method for preventing hot-rolled edge crack of low-temperature heating oriented silicon steel Download PDFInfo
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- CN113058998A CN113058998A CN202110288522.6A CN202110288522A CN113058998A CN 113058998 A CN113058998 A CN 113058998A CN 202110288522 A CN202110288522 A CN 202110288522A CN 113058998 A CN113058998 A CN 113058998A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
Abstract
The invention relates to a method for preventing hot rolling edge crack of low-temperature heating oriented silicon steel, which comprises the following steps: 1) controlling the surface temperature of the oriented silicon steel casting blank before entering a heating furnace; 2) controlling the temperature of furnace gas of each section of the heating section; 3) the second heating section adopts accelerated heating; 4) controlling the total heating time; 5) controlling the tapping temperature; 6) controlling the finish rolling pass and the side pressure; 7) controlling the finish rolling pass and the finish rolling temperature; 8) and heating and compensating the edge part of the steel strip before finish rolling. The invention avoids or eliminates the problem of hot rolling edge crack of the low-temperature heating oriented silicon steel by reasonably setting the heating temperature, the heating time and the rolling process system of the oriented silicon steel.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a method for preventing hot rolling edge crack of low-temperature heating oriented silicon steel.
Background
The oriented silicon steel is known as a 'handicraft in steel products' due to the characteristics of long process route, high technical content, complex process, narrow process window, strict process control and the like.
Because the silicon content of the oriented silicon steel is high (about 3.0 percent) and the carbon content is low (0.030 percent to 0.055 percent), only little austenite is generated during high-temperature heating, and most tissues are still ferrite. That is, most of the structure is not transformed by heating at a high temperature, and is ferrite at a low temperature and is still ferrite at a high temperature.
The continuous casting billet of the oriented silicon steel has developed columnar crystals due to the characteristic of rapid solidification. When the oriented silicon steel is heated at a high temperature, the heating temperature (1250-1400 ℃) is higher, columnar crystals of a continuous casting billet are easier to grow than isometric crystals of a primary rolling billet, and coarse grains after high-temperature heating cannot be fully recrystallized during rough rolling, so that a mixed structure of coarse and long-strip-shaped unrecrystallized grains and fine and isometric recrystallized grains is formed. And because the Si content of the oriented silicon steel is high, the ductility, toughness and thermal conductivity of the steel are relatively low, the brittleness of the steel is greatly increased along with the reduction of temperature during rolling, and edge cracks are developed during finish rolling.
The successful research and development and the common application of the low-temperature heating oriented silicon steel process technology greatly reduce the growth degree of casting blank crystal grains, and greatly reduce the surface decarburization degree, thereby greatly reducing the probability of the generation of the edge crack defects of the oriented silicon steel. However, if the method is improper, the possibility of edge crack defect is still existed at a high probability, although the edge crack degree is slight, the method still has a large influence on the yield and the cold rolling process, and the invention is used for solving the problem of hot rolling edge crack of the low-temperature heating oriented silicon steel.
Chinese patent with publication No. CN 103484643B discloses a method for preventing hot rolled edge crack of oriented silicon steel, which controls the temperature of the corner of the oriented silicon steel plate blank not lower than 550 ℃ before entering a heating furnace; controlling the temperature of a preheating section in the heating furnace to be 950-1050 ℃, and controlling the temperature of a first heating section to be 1050-1150 ℃; and controlling the finish rolling inlet temperature to be 1050-1150 ℃ and the finish rolling finishing temperature to be 900-1000 ℃. The theory is that the temperature of the corner part of the plate blank entering the furnace and the first heating temperature are controlled, the thermal stress of the corner part during heating is reduced, the generation of internal cracks is prevented, the finish rolling inlet and the finish rolling temperature of a continuous rolling unit are controlled, and the tension between frames is reasonably set, so that the generation of hot rolling edge crack defects is prevented. However, the reason for the edge crack is that the casting blank is heated and kept warm for a long time, crystal grains grow abnormally, grain boundaries are oxidized and decarburized, and the edge crack is generated after rolling.
The Chinese patent with the publication number of CN 108193037B discloses that the 'process for preventing hot rolling edge crack of oriented silicon steel' adopts process control measures including controlling the heating temperature of a second heating section and a soaking section, and corresponding heating time, rolling rhythm and the like, the furnace gas temperature of the process control measures exceeds 1300 ℃, the process control measures belong to the field of high-temperature heating of oriented silicon steel edge crack, and the process control measures are essentially different from the invention, so the measures can only relieve the occurrence of edge crack and cannot completely eliminate the edge crack.
Kawasaki-oriented silicon steel hot-rolled edge cracking and a method for preventing the same (China metallurgy, 2006 (07): 41-44.) described in the text, Kawasaki corporation, Japan adopted that the mass fraction of oxygen in a protective atmosphere and the holding time are controlled when a slab is heated at 1200 ℃ or higher; adjusting the rough rolling reduction rate and the rolling temperature; performing wide rolling and edge heating; the edge crack of the high-temperature heating oriented silicon steel is improved by a series of measures of changing the deformation energy of the material, inhibiting the generation of scale-shaped defects at the edge part and the like. The invention does not relate to the quality of oxygen in the protective atmosphere during heating, the temperature condition and the stage of the holding time are different from those of the invention, the invention does not relate to the adjustment of the rough rolling reduction rate, and the width reduction is different from that of the invention.
In the new day iron, a series of measures such as electromagnetic stirring, heating of a continuous casting slab directly fed to the edge, performing edge pressing of the slab, electromagnetic induction heating, controlled cooling and controlled rolling, controlling the starting temperature and the final temperature of hot rolling and finish rolling, the final pass reduction rate and the heating temperature, controlling the structure, reducing the temperature difference between the edge and the middle, eliminating dog bones and the like are adopted to improve the edge cracking of the high-temperature heating oriented silicon steel. The method of electromagnetic stirring and edge heating of the casting blank is adopted in the article, the invention does not relate to the method, and the measures of edge reduction, electromagnetic induction heating and the like of the blank are also obviously different from the method.
In the article of the measures for reducing the edge crack of the hot rolling of the oriented silicon steel (Wu Steel technology, 1991 (03): 24-27), the edge crack of the high-temperature heating oriented silicon steel is improved by adopting a process system of 'rough rolling rear section large side pressure'. The method is obviously different from the side pressure adjusting method of the invention.
In the analysis of cause of edge-curl crack defect of oriented silicon steel (Wu Steel technology, 1989 (09): 21-27), measures such as adjusting cooling water in continuous casting, cleaning cast blank surface, improving rolling reduction distribution, adjusting cooling water amount in rolling and the like are adopted. The measures taken are clearly different from the present invention and no adjustment parameters are explicitly mentioned.
Disclosure of Invention
The invention provides a method for preventing hot rolling edge cracking of low-temperature heating oriented silicon steel, which avoids or eliminates the problem of hot rolling edge cracking of the low-temperature heating oriented silicon steel by reasonably formulating the heating temperature, the heating time and the rolling process system of the oriented silicon steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preventing hot rolling edge crack of low-temperature heating oriented silicon steel comprises the following steps:
1) controlling the surface temperature of the oriented silicon steel casting blank to be not lower than 560 ℃ before entering a heating furnace;
2) controlling the temperature of furnace gas at a preheating section of a heating furnace below 950 ℃; controlling the temperature of furnace gas of a heating section within the range of 950-1100 ℃; controlling the temperature of furnace gas of the second heating section within the range of 1150-1210 ℃; controlling the temperature of furnace gas of a soaking section within the range of 1150-1180 ℃;
3) after the oriented silicon steel casting blank enters a second heating section, rapidly heating at a temperature rise speed of 15-30 ℃/min;
4) controlling the total heating time of the oriented silicon casting blank in the heating furnace to be not more than 290 minutes; the sum of the heating time of the second heating section and the soaking section is 80-100 min, wherein the heating time of the soaking section is 30-40 min;
5) controlling the discharging temperature of the oriented silicon steel casting blank within the range of 1140-1170 ℃; the average grain size of the oriented silicon steel casting blank is not more than 60 mu m;
6) heating and then carrying out rough rolling, wherein the rolling pass is not more than 5; the side pressure of rough rolling is more than or equal to 75mm, wherein the side pressure of the vertical rolling mill is more than 40 mm;
7) carrying out finish rolling after rough rolling, and controlling the finish rolling temperature of the steel strip within the range of 901-959 ℃;
8) and before finish rolling, heating and compensating the edge of the steel strip, wherein the compensation temperature is controlled within the range of 60-80 ℃.
In the process 1), the surface temperature of the oriented silicon steel casting blank is controlled in a stacking slow cooling or heat preservation mode of a heat preservation pit.
In the process 6), reversible rolling is adopted for rough rolling.
And in the step 7), the finish rolling is carried out by adopting a 7-pass continuous rolling unit.
In the process 8), the edge of the steel strip is heated and compensated by the induction heating device.
The width of the oriented silicon steel casting blank is +/-75-100 mm of the width of a hot rolled finished product, and the thickness of the oriented silicon steel intermediate blank is controlled within the range of 41-50 mm.
Compared with the prior art, the invention has the beneficial effects that:
after the method is applied, the edge crack defect of the oriented silicon steel is completely eliminated, the edge quality is fundamentally improved, the cold rolling process does not need edge cutting and rolling, the rejection rate is greatly reduced, and the yield is greatly improved.
Detailed Description
The invention discloses a method for preventing hot rolling edge crack of low-temperature heating oriented silicon steel, which comprises the following steps:
1) controlling the surface temperature of the oriented silicon steel casting blank to be not lower than 560 ℃ before entering a heating furnace;
2) controlling the temperature of furnace gas at a preheating section of a heating furnace below 950 ℃; controlling the temperature of furnace gas of a heating section within the range of 950-1100 ℃; controlling the temperature of furnace gas of the second heating section within the range of 1150-1210 ℃; controlling the temperature of furnace gas of a soaking section within the range of 1150-1180 ℃;
3) after the oriented silicon steel casting blank enters a second heating section, rapidly heating at a temperature rise speed of 15-30 ℃/min;
4) controlling the total heating time of the oriented silicon casting blank in the heating furnace to be not more than 290 minutes; the sum of the heating time of the second heating section and the soaking section is 80-100 min, wherein the heating time of the soaking section is 30-40 min;
5) controlling the discharging temperature of the oriented silicon steel casting blank within the range of 1140-1170 ℃; the average grain size of the oriented silicon steel casting blank is not more than 60 mu m;
6) heating and then carrying out rough rolling, wherein the rolling pass is not more than 5; the side pressure of rough rolling is more than or equal to 75mm, wherein the side pressure of the vertical rolling mill is more than 40 mm;
7) carrying out finish rolling after rough rolling, and controlling the finish rolling temperature of the steel strip within the range of 901-959 ℃;
8) and before finish rolling, heating and compensating the edge of the steel strip, wherein the compensation temperature is controlled within the range of 60-80 ℃.
In the process 1), the surface temperature of the oriented silicon steel casting blank is controlled in a stacking slow cooling or heat preservation mode of a heat preservation pit.
In the process 6), reversible rolling is adopted for rough rolling.
And in the step 7), the finish rolling is carried out by adopting a 7-pass continuous rolling unit.
In the process 8), the edge of the steel strip is heated and compensated by the induction heating device.
The width of the oriented silicon steel casting blank is +/-75-100 mm of the width of a hot rolled finished product, and the thickness of the oriented silicon steel intermediate blank is controlled within the range of 41-50 mm.
The principle of the method for preventing the hot rolling edge crack of the low-temperature heating oriented silicon steel is as follows:
1) the measure of the process 1) is adopted, and the risks that the oriented silicon steel has high Si content, poor thermal conductivity and extremely high brittleness at low temperature, and the casting blank is easy to crack at low temperature and the like are considered; therefore, the invention adopts corresponding heat preservation measures.
2) The measures of the processes 2) to 5) are taken, the oriented silicon steel has high Si content and low C content, and the crystal grains cannot be refined through austenite-ferrite phase transformation in the cooling process after continuous casting, so that the crystal grains of the casting blank are coarse. The coarse grains can further grow up in the subsequent reheating process of the heating furnace, and the grain boundary oxidation and decarburization can occur under the high-temperature heating and the long-time heat preservation at high temperature, so that the grain boundary is embrittled, and the cracking at the grain boundary can occur in the rough rolling process. These micro-cracks develop into edge crack defects by rolling healing during the finish rolling process due to the inability of dynamic recrystallization to occur. Therefore, the invention controls the casting blank to be rapidly heated from low temperature to high temperature, properly reduces the heat preservation temperature during high-temperature heat preservation, and controls the heat preservation time, thereby avoiding abnormal growth of crystal grains and oxidation and decarburization of crystal boundaries caused by overlong high-temperature heating. The average grain size of the hot-rolled finished product is controlled to be not more than 60 mu m by the measures.
3) And 6) to 7) are adopted to control the rolling processes of rough rolling pass, descaling water, steel plate cooling water, roller cooling water flow, pressure and the like in the rolling process, so that the temperature drop of the rolled piece in the rolling process is reduced. The temperature drop in the rough rolling process and the carrying process can be effectively reduced by properly increasing the thickness of the intermediate billet. Due to the particularity of the oriented silicon steel, a brittle area exists in the temperature range of 750-860 ℃, the steel plate is shaped at the temperature, and the risk of brittle failure of the steel plate is greatly increased; therefore, the invention rolls in the rolling process by avoiding the temperature interval. The temperature of the edge of the strip steel is generally lower than that of the middle part by 60-80 ℃, so that the temperature of the edge is compensated to avoid a brittle zone; meanwhile, the temperature of the edge part is improved, the dynamic recrystallization driving force of the edge part is favorably improved, the ductility of the edge part is improved, and the probability of tearing the edge part in the rolling process of the edge part can be reduced. The measures can effectively reduce the risk of edge crack.
4) In the process 8), a larger side pressure is selected, so that the rolling of the edge part can be strengthened, defects of the surface of the corner part of the casting blank in the heating process can be effectively eliminated, and the quality of the edge part is improved; and secondly, the stress strain degree of edge rolling can be improved by increasing the rolling side pressure of the vertical roll, the edge recrystallization is promoted, the edge grains are refined, and the edge quality is improved.
If the heating furnace is provided with a heat recovery section, the preheating section in the process 2) comprises the heat recovery section, and the total heating time in the process 4) does not comprise the heat recovery section time.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In the embodiment, the process parameters of the oriented silicon steel production process are shown in tables 1 to 3.
TABLE 1
TABLE 2
TABLE 3
In this example, the oriented silicon steel sheets produced in examples 1 to 8 did not have edge cracks.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A method for preventing hot rolling edge crack of low-temperature heating oriented silicon steel is characterized by comprising the following steps:
1) controlling the surface temperature of the oriented silicon steel casting blank to be not lower than 560 ℃ before entering a heating furnace;
2) controlling the temperature of furnace gas at a preheating section of a heating furnace below 950 ℃; controlling the temperature of furnace gas of a heating section within the range of 950-1100 ℃; controlling the temperature of furnace gas of the second heating section within the range of 1150-1210 ℃; controlling the temperature of furnace gas of a soaking section within the range of 1150-1180 ℃;
3) after the oriented silicon steel casting blank enters a second heating section, rapidly heating at a temperature rise speed of 15-30 ℃/min;
4) controlling the total heating time of the oriented silicon casting blank in the heating furnace to be not more than 290 minutes; the sum of the heating time of the second heating section and the soaking section is 80-100 min, wherein the heating time of the soaking section is 30-40 min;
5) controlling the discharging temperature of the oriented silicon steel casting blank within the range of 1140-1170 ℃; the average grain size of the oriented silicon steel casting blank is not more than 60 mu m;
6) heating and then carrying out rough rolling, wherein the rolling pass is not more than 5; the side pressure of rough rolling is more than or equal to 75mm, wherein the side pressure of the vertical rolling mill is more than 40 mm;
7) carrying out finish rolling after rough rolling, and controlling the finish rolling temperature of the steel strip within the range of 901-959 ℃;
8) and before finish rolling, heating and compensating the edge of the steel strip, wherein the compensation temperature is controlled within the range of 60-80 ℃.
2. The method for preventing the hot rolling edge crack of the low-temperature heating oriented silicon steel as claimed in claim 1, wherein in the process 1), the surface temperature of the oriented silicon steel billet is controlled by stacking slow cooling or heat preservation of a heat preservation pit.
3. The method for preventing the hot rolled edge crack of the low-temperature heating oriented silicon steel as claimed in claim 1, wherein in the process 6), the rough rolling adopts reversible rolling.
4. The method for preventing the hot rolled edge cracking of the low-temperature heating oriented silicon steel as set forth in claim 1, wherein the finish rolling in the step 7) is performed by a 7-pass continuous rolling unit.
5. The method for preventing the hot rolled edge crack of the low temperature heating oriented silicon steel as claimed in claim 1, wherein in the process 8), the edge part of the steel strip is compensated by heating through an induction heating device.
6. The method for preventing the hot rolling edge crack of the low-temperature heating oriented silicon steel as claimed in claim 1, wherein the width of the oriented silicon steel casting blank is + (75-100) mm of the width of the hot rolling finished product, and the thickness of the oriented silicon steel intermediate blank is controlled within the range of 41-50 mm.
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Cited By (11)
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| CN113458142A (en) * | 2021-07-05 | 2021-10-01 | 湖南华菱涟源钢铁有限公司 | Medium-temperature common oriented silicon steel and preparation method thereof |
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| CN114393038B (en) * | 2021-12-31 | 2023-02-24 | 武汉钢铁有限公司 | Hot rolling method of low-temperature high-magnetic-induction oriented silicon steel |
| CN114535315A (en) * | 2022-02-08 | 2022-05-27 | 山西太钢不锈钢股份有限公司 | Process for preventing high magnetic induction oriented silicon steel from hot rolling edge crack |
| CN114535315B (en) * | 2022-02-08 | 2023-10-20 | 山西太钢不锈钢股份有限公司 | Process for preventing hot rolling edge crack of high-magnetic-induction oriented silicon steel |
| CN114632818A (en) * | 2022-03-14 | 2022-06-17 | 安阳钢铁股份有限公司 | Process method for reducing hot-rolled edge cracks of oriented silicon steel |
| CN114632818B (en) * | 2022-03-14 | 2023-12-05 | 安阳钢铁股份有限公司 | Technological method for reducing hot rolling edge cracking of oriented silicon steel |
| CN114643288A (en) * | 2022-03-25 | 2022-06-21 | 安阳钢铁股份有限公司 | Method for improving rolling warping of low-temperature non-oriented silicon steel |
| CN117718341A (en) * | 2024-02-08 | 2024-03-19 | 包头威丰新材料有限公司 | High-magnetic-induction oriented silicon steel and process for improving hot rolling edge crack defect of high-magnetic-induction oriented silicon steel |
| CN117718341B (en) * | 2024-02-08 | 2024-04-16 | 包头威丰新材料有限公司 | High-magnetic-induction oriented silicon steel and process for improving hot rolling edge crack defect of high-magnetic-induction oriented silicon steel |
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