CN110586657B - Production method for reducing crack defects of hot-rolled edge of non-oriented silicon steel - Google Patents
Production method for reducing crack defects of hot-rolled edge of non-oriented silicon steel Download PDFInfo
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- CN110586657B CN110586657B CN201910833451.6A CN201910833451A CN110586657B CN 110586657 B CN110586657 B CN 110586657B CN 201910833451 A CN201910833451 A CN 201910833451A CN 110586657 B CN110586657 B CN 110586657B
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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
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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
- B21B37/48—Tension control; Compression control
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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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Abstract
The invention relates to a production method for reducing the crack defect of the hot rolled edge of non-oriented silicon steel, which comprises the following steps of 1) controlling the temperature of an intermediate blank from discharging of a plate blank to finishing rolling to be reduced to 160-190 ℃, and controlling the temperature of the edge of finish rolling finish rolled strip steel to be 830-860 ℃; 2) controlling the opening degree of a finish rolling side guide according to the front and back sequence of the finish rolling mill to increase progressively according to an unequal amount; 3) and controlling the inlet side guide pressure of the coiling machine according to the components and rolling specifications of the non-oriented silicon steel. The method of the invention obviously improves the edge quality of the non-oriented silicon steel hot-rolled strip steel, and reduces the crack defect of the hot-rolled edge from 3.57 percent to below 0.65 percent.
Description
Technical Field
The invention relates to the technical field of steel rolling processes, in particular to a production method for reducing the crack defect of a hot-rolled edge part of non-oriented silicon steel.
Background
The non-oriented silicon steel is used as a soft magnetic material, has the material characteristics of high magnetic induction and low iron loss, is widely applied to electric equipment such as motor rotors, compressors and the like, and is mainly characterized in that silicon elements, aluminum elements and other alloy elements are added into the material to realize the material characteristics of increasing the magnetic induction and reducing the iron loss. The non-oriented silicon steel has low carbon content and high silicon content in steel and requires lower heating temperature in process, so that the non-oriented silicon steel is mostly subjected to two-phase zone rolling or complete ferrite zone rolling in hot rolling and final rolling, the strength and the thermoplasticity of the strip steel are low, the edge crack defect is easily generated in the rolling process, the strip breakage accident is easily generated in the cold rolling process of the silicon steel due to the hot rolling edge crack defect, the production quality safety of the cold rolling process is seriously harmed, and the control of the edge crack defect of the non-oriented silicon steel is a production problem of each silicon steel production enterprise.
Disclosure of Invention
The invention aims to solve the technical problem of providing a production method for reducing the edge crack defect of non-oriented silicon steel hot rolling, solving the problem of easy generation of the edge crack quality defect in the production process of a non-oriented silicon steel hot rolling steel strip and improving the surface quality of the strip steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method for reducing crack defects of hot rolled edge parts of non-oriented silicon steel specifically comprises the following steps:
1) controlling the temperature of the edge of the strip steel: controlling the temperature of an intermediate blank after the plate blank is discharged from a furnace and the finish rolling is finished to be reduced to 160-190 ℃, and controlling the temperature range of the edge of the finish rolling strip steel to be 830-860 ℃;
2) controlling the opening degree of the finish rolling side guide according to the front and back sequence of the finish rolling mill to increase progressively according to an unequal amount: bi ═ B0+ Zi; in the formula:
bi: finish rolling the opening degree of the side guide of the ith machine frame;
b0: hot rolling the strip steel to an actual width;
zi: finishing the opening allowance correction value of the ith rack side guide;
3) controlling the inlet side guide pressure of a coiling machine according to the components and rolling specifications of the non-oriented silicon steel: fi × Xi × Hi × Li × F0; in the formula:
fi: the silicon element content, the finished product thickness and the finished product width refer to the guide and guard pressure control value of the i-th finish rolling machine frame to the inlet side of the non-oriented silicon steel hot rolling coiling of the coiling machine;
xi: the component pressure coefficient of silicon element content;
hi: the thickness pressure coefficient of the hot-rolled non-oriented silicon steel;
li: width pressure coefficient of hot-rolled non-oriented silicon steel;
f0: the guide and guard reference pressure of the hot rolling coiler;
in step 2):
f2 the allowance of the opening degree of the side guide of the finish rolling mill is 20-40 mm;
f3 the allowance of the opening degree of the side guide of the finish rolling mill is 20-40 mm;
the allowance of the opening degree of a side guide of the F4 finish rolling mill is 30-50 mm;
the allowance of the opening degree of the side guide of the F5 finish rolling mill is 55-75 mm;
the allowance of the opening degree of the side guide of the F6 finish rolling mill is 55-75 mm;
f7 the allowance of the opening degree of the side guide of the finish rolling mill is 60-80 mm;
in step 3):
the percentage content of Si is less than or equal to 0.7 percent, and the component pressure coefficient Xi of the Si content is 0.65-0.75;
the percentage content of Si is more than 0.7 percent and less than or equal to 1.2 percent, and the component pressure coefficient Xi of the content of the silicon element is 0.55-0.65;
the percentage content of Si is more than 1.2 percent and less than or equal to 1.7 percent, and the component pressure coefficient Xi of the content of the silicon element is 0.45-0.55;
the percentage content of Si is more than 1.7 percent and less than or equal to 3.0 percent, and the component pressure coefficient Xi of the content of the silicon element is 0.35-0.45;
the percentage content of Si is more than 3.0 percent, and the component pressure coefficient Xi of the Si content is 0.30-0.35;
the thickness h of the strip steel is less than or equal to 2.3mm, and the thickness pressure coefficient Hi of the hot-rolled non-oriented silicon steel is 0.75-0.9;
the thickness h of the strip steel is more than 2.3mm and less than or equal to 2.5mm, and the thickness pressure coefficient Hi of the hot-rolled non-oriented silicon steel is 0.95-1.05;
the thickness h of the strip steel is more than 2.5mm and less than or equal to 3.0mm, and the thickness pressure coefficient Hi of the hot-rolled non-oriented silicon steel is 1.05-1.15;
the thickness h of the strip steel is more than 3.0mm, and the thickness pressure coefficient Hi of the hot-rolled non-oriented silicon steel is 1.15-1.25;
the width l of the strip steel is less than or equal to 1000mm, and the width pressure coefficient Li of the hot-rolled non-oriented silicon steel is 0.75-0.9;
the width l of the strip steel is more than 1000mm and less than or equal to 1150mm, and the width pressure coefficient Li of the hot-rolled non-oriented silicon steel is 0.9-1.1;
the steel width l is more than 1150mm and less than or equal to 1300mm, and the width pressure coefficient Li of the hot-rolled non-oriented silicon steel is 1.1-1.2;
the steel width l is more than 1300mm, and the width pressure coefficient Li of the hot-rolled non-oriented silicon steel is 1.2-1.3.
Compared with the prior art, the invention has the beneficial effects that:
the method of the invention obviously improves the edge quality of the non-oriented silicon steel hot-rolled strip steel, and reduces the crack defect of the hot-rolled edge from 3.57 percent to 0.65 percent.
Detailed Description
The following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
A production method for reducing crack defects of hot rolled edge parts of non-oriented silicon steel specifically comprises the following steps:
1) controlling the temperature of the edge of the strip steel: controlling the temperature drop of an intermediate blank from the discharging of the plate blank to the finishing rolling to be 160-190 ℃, and controlling the temperature range of the edge of the finish rolling strip steel to be 830-860 ℃;
2) controlling the opening degree of the finish rolling side guide: bi ═ B0+ Zi;
bi: finish rolling the opening degree of the side guide of the ith machine frame;
b0: hot rolling the strip steel to an actual width;
zi: finishing the opening allowance correction value of the ith rack side guide;
the allowance correction value of the opening degree of the side guide is shown in a table 1;
table 1: finish rolling side guide opening allowance setting table
3) Controlling the pressure of the inlet side guide of the coiler: fi × Xi × Hi × Li × F0;
fi: the silicon element content, the finished product thickness and the finished product width refer to the guide and guard pressure control value of the i-th finish rolling machine frame to the inlet side of the non-oriented silicon steel hot rolling coiling of the coiling machine;
xi: the component pressure coefficient of silicon element content;
hi: the thickness pressure coefficient of the hot-rolled non-oriented silicon steel;
li: width pressure coefficient of hot-rolled non-oriented silicon steel;
f0: the guide and guard reference pressure of the hot rolling coiler;
the elemental silicon content component pressure coefficients are shown in table 2;
table 2: pressure coefficient of silicon element content component
The thickness pressure coefficient of the hot-rolled non-oriented silicon steel is shown in Table 3;
table 3: thickness pressure coefficient of hot-rolled non-oriented silicon steel
| Thickness h, mm of strip steel | h≤2.3 | 2.3＜h≤2.5 | 2.5＜h≤3.0 | 3.0＜h |
| Thickness pressure coefficient Hi of hot-rolled non-oriented silicon steel | 0.85～0.95 | 0.95～1.05 | 1.05～1.15 | 1.15～1.25 |
The width pressure coefficient of the hot-rolled non-oriented silicon steel is shown in Table 4;
table 4: width pressure coefficient of hot-rolled non-oriented silicon steel
Example 1
The non-oriented silicon steel hot rolled coil with the Si content of 1.60 percent and the hot rolling specification of 2.3 x 1230mm is produced, the production process is controlled as follows,
1) the temperature of the intermediate blank is reduced to 175 ℃ from the discharging of the plate blank to the finish rolling and finish rolling, and the temperature of the edge of the finish rolling strip steel is 843 ℃.
2) The opening degree of the finish rolling side guide is controlled and shown in a table 5; bi ═ B0+ Ki, Bi: finish rolling the ith rack side guide guard opening degree, B0: actual width of hot rolling strip 1230mm, Ki: the allowance correction value of the opening degree of the side guide,
table 5:
| number of finishing stand | F2 | F3 | F4 | F5 | F6 | F7 |
| Margin Ki, mm of opening degree of side guide | 30 | 30 | 40 | 70 | 70 | 80 |
| Opening Bi, mm of side guard | 1260 | 1260 | 1270 | 1300 | 1300 | 1310 |
3) And controlling the guide and guard pressure at the inlet side of the non-oriented silicon steel coiler.
Fi＝Xi*Hi*Li*F0
The parameters in the formula are set as follows: xi ═ 0.5, Hi ═ 0.9, Li ═ 1.15, F0 ═ 13 Mpa;
Fi＝0.5*0.9*1.15*13Mpa＝6.73Mpa
the non-oriented silicon steel hot-rolled coil produced by the process has the Si content of 1.60 percent, the hot-rolled specification of 2.3 x 1230mm is good in edge quality, and the edge crack defect rate is 0.52 percent.
Example 2
The production process of the non-oriented silicon steel hot rolled coil with the Si content of 3.2 percent and the hot rolling specification of 2.5 x 1130mm is controlled as follows:
1) controlling the temperature of the intermediate blank from the discharging of the plate blank to the finish rolling and finish rolling to be reduced to 168 ℃, and controlling the temperature of the edge of the finish rolling strip steel to be 840 ℃.
2) The finish rolling side guide opening degree is controlled as shown in table 6: and Bi is B0+ Ki, (Bi: finish rolling the opening degree of the ith rack side guide, B0:
actual width of hot-rolled strip steel 1130mm, Ki: side guide opening degree allowance correction value)
Table 6:
| number of finishing stand | F2 | F3 | F4 | F5 | F6 | F7 |
| Margin Ki, mm of opening degree of side guide | 30 | 30 | 40 | 70 | 70 | 80 |
| Opening Bi, mm of side guard | 1160 | 1160 | 1170 | 1200 | 1200 | 1210 |
3) And controlling the guide and guard pressure at the inlet side of the non-oriented silicon steel coiler.
Fi＝Xi*Hi*Li*F0
The parameters in the formula are set as follows: xi ═ 0.33, Hi ═ 1.02, Li ═ 0.98, F0 ═ 13 Mpa;
Fi＝0.33*1.02*0.98*13Mpa＝4.29Mpa
the non-oriented silicon steel hot-rolled coil with the Si content of 3.2% and the hot-rolled specification of 2.5 x 1130mm produced by the process has good quality, and the defect rate of edge cracks is 0.58%.
The defect of the crack of the hot-rolled edge of the non-oriented silicon steel is mainly due to the fact that the strength and the shape of the hot-rolled strip steel are low, the crack is generated due to insufficient edge shape in the rolling process, the strip steel impacts a scraping mill and a side guide of a coiling machine to generate the scraping crack, and the technical scheme mainly controls the defect of the crack of the edge in the aspects of reducing the temperature drop of the strip steel in the hot-rolled process of the non-oriented silicon steel, reducing scraping of equipment such as the guide of the mill and.
The foregoing is considered as illustrative only of the principles of the invention and is not to be in any way limiting, since all equivalent changes and modifications are intended to be included within the scope of the appended claims.
Claims (1)
1. A production method for reducing crack defects of hot rolled edge parts of non-oriented silicon steel is characterized by comprising the following steps:
1) controlling the temperature of an intermediate blank after the plate blank is discharged from a furnace and the finish rolling is finished to be reduced to 160-190 ℃, and controlling the temperature range of the edge of the finish rolling strip steel to be 830-860 ℃;
2) controlling the opening degree of the finish rolling side guide according to the front and back sequence of the finish rolling mill to increase progressively according to an unequal amount: bi ═ B0+ Zi; in the formula:
bi: finish rolling the opening degree of the side guide of the ith machine frame;
b0: hot rolling the strip steel to an actual width;
zi: finishing the opening allowance correction value of the ith rack side guide;
3) controlling the inlet side guide pressure of a coiling machine according to the components and rolling specifications of the non-oriented silicon steel: fi × Xi × Hi × Li × F0; in the formula:
fi: the silicon element content, the finished product thickness and the finished product width refer to the guide and guard pressure control value of the i-th finish rolling machine frame to the inlet side of the non-oriented silicon steel hot rolling coiling of the coiling machine;
xi: the component pressure coefficient of silicon element content;
hi: the thickness pressure coefficient of the hot-rolled non-oriented silicon steel;
li: width pressure coefficient of hot-rolled non-oriented silicon steel;
f0: the guide and guard reference pressure of the hot rolling coiler;
in step 2):
f2 the allowance of the opening degree of the side guide of the finish rolling mill is 20-40 mm;
f3 the allowance of the opening degree of the side guide of the finish rolling mill is 20-40 mm;
the allowance of the opening degree of a side guide of the F4 finish rolling mill is 30-50 mm;
the allowance of the opening degree of the side guide of the F5 finish rolling mill is 55-75 mm;
the allowance of the opening degree of the side guide of the F6 finish rolling mill is 55-75 mm;
f7 the allowance of the opening degree of the side guide of the finish rolling mill is 60-80 mm;
in step 3):
the percentage content of Si is less than or equal to 0.7 percent, and the component pressure coefficient Xi of the Si content is 0.65-0.75;
the percentage content of Si is more than 0.7 percent and less than or equal to 1.2 percent, and the component pressure coefficient Xi of the content of the silicon element is 0.55-0.65;
the percentage content of Si is more than 1.2 percent and less than or equal to 1.7 percent, and the component pressure coefficient Xi of the content of the silicon element is 0.45-0.55;
the percentage content of Si is more than 1.7 percent and less than or equal to 3.0 percent, and the component pressure coefficient Xi of the content of the silicon element is 0.35-0.45;
the percentage content of Si is more than 3.0 percent, and the component pressure coefficient Xi of the Si content is 0.30-0.35;
the thickness h of the strip steel is less than or equal to 2.3mm, and the thickness pressure coefficient Hi of the hot-rolled non-oriented silicon steel is 0.75-0.9;
the thickness h of the strip steel is more than 2.3mm and less than or equal to 2.5mm, and the thickness pressure coefficient Hi of the hot-rolled non-oriented silicon steel is 0.95-1.05;
the thickness h of the strip steel is more than 2.5mm and less than or equal to 3.0mm, and the thickness pressure coefficient Hi of the hot-rolled non-oriented silicon steel is 1.05-1.15;
the thickness h of the strip steel is more than 3.0mm, and the thickness pressure coefficient Hi of the hot-rolled non-oriented silicon steel is 1.15-1.25;
the width l of the strip steel is less than or equal to 1000mm, and the width pressure coefficient Li of the hot-rolled non-oriented silicon steel is 0.75-0.9;
the width l of the strip steel is more than 1000mm and less than or equal to 1150mm, and the width pressure coefficient Li of the hot-rolled non-oriented silicon steel is 0.9-1.1;
the steel width l is more than 1150mm and less than or equal to 1300mm, and the width pressure coefficient Li of the hot-rolled non-oriented silicon steel is 1.1-1.2;
the steel width l is more than 1300mm, and the width pressure coefficient Li of the hot-rolled non-oriented silicon steel is 1.2-1.3.
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| JP2000073120A (en) * | 1998-08-31 | 2000-03-07 | Kawasaki Steel Corp | Production of grain oriented silicon steel sheet free from edge crack and edge distortion |
| CN102039330A (en) * | 2010-10-16 | 2011-05-04 | 山西太钢不锈钢股份有限公司 | Parameter setting method of hot continuous rolling thin slab coiling device and coiling method of hot continuous rolling thin slab |
| CN102367547B (en) * | 2011-10-31 | 2013-03-13 | 山西太钢不锈钢股份有限公司 | Manufacture method of high-silicon aluminum content non-oriented silicon steel strip |
| CN103801566A (en) * | 2013-12-26 | 2014-05-21 | 宝钢发展有限公司 | Control method for reducing edge faults of hot rolled steel plate in line rolling process |
| CN104985021B (en) * | 2015-07-29 | 2016-11-02 | 中冶南方(武汉)威仕工业炉有限公司 | A kind of Edge Heating device and method preventing steel edge portion from ftractureing |
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