CN114643288A - Method for improving rolling warping of low-temperature non-oriented silicon steel - Google Patents
Method for improving rolling warping of low-temperature non-oriented silicon steel Download PDFInfo
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- CN114643288A CN114643288A CN202210302688.3A CN202210302688A CN114643288A CN 114643288 A CN114643288 A CN 114643288A CN 202210302688 A CN202210302688 A CN 202210302688A CN 114643288 A CN114643288 A CN 114643288A
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- temperature
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- silicon steel
- rolled piece
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- 238000005096 rolling process Methods 0.000 title claims abstract description 40
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000009467 reduction Effects 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000002791 soaking Methods 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 6
- 239000010703 silicon Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 229910000617 Mangalloy Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- 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
- B21B37/56—Elongation control
-
- 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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Of Steel Electrode Plates (AREA)
Abstract
The invention discloses a method for improving rolling warping of low-temperature non-oriented silicon steel, which comprises the following specific steps: s1, reducing the extension of the lower surface of the rolled piece relative to the upper surface by increasing the temperature of the lower surface of the rolled piece; s2, reducing the reduction rate of the nose warping pass, and being suitable for improving the nose warping of low-temperature non-oriented silicon steel rolling, after the method is applied to a 1780mm hot continuous rolling unit, the nose warping abnormal rate of the non-oriented silicon steel with the silicon content of 0.8-1.1% is reduced from 10.29% to 1.78%, the production stability is effectively improved, the rolling waste products are greatly reduced, and the accident that the nose is pushed against the outlet of a rolling mill is avoided.
Description
Technical Field
The invention belongs to the technical field of metal material processing, and particularly relates to a method for improving rolling warping of low-temperature non-oriented silicon steel.
Background
The non-oriented silicon steel is widely applied to the field of electrical equipment as a material with low iron loss and high magnetic induction. In the production of non-oriented silicon steel with the silicon content of 0.8-1.1% in hot continuous rolling, the rolling nose of a roughing mill is one of the important problems influencing the production. The head warping is usually caused by inconsistent extension of the upper surface and the lower surface of a rolled piece, the surface with large extension is bent towards the surface with small extension to form the head warping, the head warping can cause that the rolled piece cannot be bitten next time to form rolled waste, and the head warping can collide the outlet guide of the rolling mill to form a malignant accident in severe cases.
The hot rolling of steel of the common carbon-manganese composition system is usually carried out in an austenite region, the good plasticity of an austenite structure and the lower deformation resistance are beneficial to rolling, generally, no phase transformation exists in the rolling stage, the deformation resistance of the steel is increased along with the reduction of the temperature, and the extensibility is reduced along with the reduction of the temperature. When the head of stick up appears usually, improve rolled piece upper surface temperature, reduce rolled piece lower surface temperature for upper surface extends to be greater than the lower surface and extends when the rolled piece is rolled, can improve the head of stick up. However, in the silicon steel rolling process, because silicon element is an element for expanding a ferrite zone, the phase transition temperature of the silicon steel is far higher than that of common carbon manganese steel, according to a thermal simulation experiment, the phase transition temperature of the transformation from austenite to ferrite of the silicon steel with the silicon content of 0.8-1.1% is 925-1050 ℃, and the rough rolling finishing temperature in the actual rolling process is 1000 ℃, so that the phase transition exists in the rough rolling process. Because the deformation resistance of ferrite is reduced compared with that of austenite at similar temperature, the characteristics of negative correlation between the deformation resistance of steel and temperature are changed, and the warping is more serious according to the operation method of common carbon-manganese steel.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for improving the rolling warping of low-temperature non-oriented silicon steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for improving rolling warping of low-temperature non-oriented silicon steel comprises the following specific steps:
s1, reducing the extension of the lower surface of the rolled piece relative to the upper surface by increasing the temperature of the lower surface of the rolled piece;
and S2, reducing the rolling reduction of the nose warping pass.
In one possible implementation manner, the low-temperature non-oriented silicon steel is prepared from the following raw materials in percentage by weight: c is less than or equal to 0.0030%, Si: 0.80-1.10%, Mn: 0.20-0.30%, P: less than or equal to 0.030 percent, S: less than or equal to 0.005 percent, Als: 0.250 to 0.400%, O: less than or equal to 0.0030 percent, N: less than or equal to 0.0040 percent, and the balance of Fe and inevitable impurities.
In a possible implementation manner, in the step S1, the extension of the lower surface of the rolled piece relative to the upper surface is reduced by increasing the temperature of the lower surface of the rolled piece, specifically as follows:
when the rolled piece is heated by the heating furnace, the heating is divided into a heating section, a second heating section and a soaking section, wherein:
the temperature of a heating section is controlled to be 1080 +/-20 ℃;
the temperature of the second heating section is controlled to be 1140 +/-20 ℃;
the temperature of the soaking section is controlled to be 1140 +/-20 ℃.
In one possible implementation, the temperature of the lower surface of the rolled piece is 5 ℃ higher than that of the upper surface during a heating section;
during the second heating section, the temperature of the lower surface of the rolled piece is 5 ℃ higher than that of the upper surface;
and in the soaking section, the temperature of the lower surface of the rolled piece is 5 ℃ higher than that of the upper surface.
In a possible implementation manner, the reduction ratio for reducing the warping pass in step S2 is specifically: the rolling reduction of the warping pass is limited within 15%.
The invention has the advantages that:
after the method is applied to a 1780mm hot continuous rolling unit, the abnormal rate of the warping head of the non-oriented silicon steel with the silicon content of 0.8-1.1% is reduced from 10.29% to 1.78%, the production stability is effectively improved, rolling waste products are greatly reduced, and the accident that the warping head impacts the outlet guide of a rolling mill is avoided.
Drawings
FIG. 1 is a block flow diagram of the method of the present invention.
Detailed Description
The following description will further describe a specific embodiment of the method for improving the rolling warping of the low-temperature non-oriented silicon steel according to the present invention with reference to fig. 1. The method for improving the rolling warping of the low-temperature non-oriented silicon steel is not limited to the description of the following embodiments.
Example 1:
the embodiment provides a method for improving rolling warping of low-temperature non-oriented silicon steel, as shown in fig. 1, the method comprises the following specific steps:
s1, reducing the extension of the lower surface of the rolled piece relative to the upper surface by increasing the temperature of the lower surface of the rolled piece;
and S2, reducing the rolling reduction of the nose warping pass.
The low-temperature non-oriented silicon steel is prepared from the following raw materials in percentage by weight: c is less than or equal to 0.0030%, Si: 0.80-1.10%, Mn: 0.20-0.30%, P: less than or equal to 0.030 percent, S: less than or equal to 0.005%, Als: 0.250 to 0.400%, O: less than or equal to 0.0030 percent, N: less than or equal to 0.0040 percent, and the balance of Fe and inevitable impurities.
In step S1, the extension of the lower surface of the rolled piece relative to the upper surface is reduced by increasing the temperature of the lower surface of the rolled piece, which is specifically as follows:
when the rolled piece is heated by the heating furnace, the heating is divided into a heating section, a second heating section and a soaking section, wherein:
the temperature of a heating section is controlled to be 1080 +/-20 ℃;
the temperature of the second heating section is controlled to be 1140 +/-20 ℃;
the temperature of the soaking section is controlled to be 1140 +/-20 ℃.
During a heating section, the temperature of the lower surface of the rolled piece is 5 ℃ higher than that of the upper surface;
during the second heating section, the temperature of the lower surface of the rolled piece is 5 ℃ higher than that of the upper surface;
and in the soaking section, the temperature of the lower surface of the rolled piece is 5 ℃ higher than that of the upper surface.
The reduction ratio for reducing the nose warping pass in step S2 specifically includes: the rolling reduction of the warping pass is limited within 15%.
Table 1 shows comparative conditions of forward and backward warping control performed by the method of the present invention (the method of the present invention was applied to a 1780mm hot continuous rolling mill train).
TABLE 1
| Number of rolled blocks | Number of nose blocks | Nose ratio (%) | |
| Before the method is carried out | 486 | 50 | 10.29％ |
| After the method is implemented | 394 | 7 | 1.78％ |
The data in table 1 show that after the method is applied to a 1780mm hot continuous rolling unit, the abnormal warping rate of non-oriented silicon steel with the silicon content of 0.8-1.1% is reduced from 10.29% to 1.78%, the production stability is effectively improved, rolling waste products are greatly reduced, and the accident that the warped head impacts the outlet guide of a rolling mill does not occur.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (5)
1. A method for improving the rolling warping of low-temperature non-oriented silicon steel is characterized by comprising the following steps: the method comprises the following specific steps:
s1, reducing the extension of the lower surface of the rolled piece relative to the upper surface by increasing the temperature of the lower surface of the rolled piece;
and S2, reducing the rolling reduction of the nose warping pass.
2. The method for improving the rolling warping of the low-temperature non-oriented silicon steel as claimed in claim 1, wherein: the low-temperature non-oriented silicon steel is prepared from the following raw materials in percentage by weight: c is less than or equal to 0.0030%, Si: 0.80-1.10%, Mn: 0.20-0.30%, P: less than or equal to 0.030 percent, S: less than or equal to 0.005%, Als: 0.250 to 0.400%, O: less than or equal to 0.0030 percent, N: less than or equal to 0.0040 percent, and the balance of Fe and inevitable impurities.
3. The method for improving the rolling warping of the low-temperature non-oriented silicon steel as claimed in claim 1, wherein: in step S1, the extension of the lower surface of the rolled piece relative to the upper surface is reduced by increasing the temperature of the lower surface of the rolled piece, which is specifically as follows:
when the rolled piece is heated by the heating furnace, the heating is divided into a first heating section, a second heating section and a soaking section, wherein:
the temperature of a heating section is controlled to be 1080 +/-20 ℃;
the temperature of the second heating section is controlled to be 1140 +/-20 ℃;
the temperature of the soaking section is controlled to be 1140 +/-20 ℃.
4. The method for improving the rolling warping of the low-temperature non-oriented silicon steel as claimed in claim 3, wherein: during a heating section, the temperature of the lower surface of the rolled piece is 5 ℃ higher than that of the upper surface;
during the second heating section, the temperature of the lower surface of the rolled piece is 5 ℃ higher than that of the upper surface;
and in the soaking section, the temperature of the lower surface of the rolled piece is 5 ℃ higher than that of the upper surface.
5. The method for improving the rolling warping of the low-temperature non-oriented silicon steel as claimed in claim 1, wherein: the reduction ratio of the nose warping pass in step S2 is specifically: the rolling reduction of the warping pass is limited within 15 percent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210302688.3A CN114643288A (en) | 2022-03-25 | 2022-03-25 | Method for improving rolling warping of low-temperature non-oriented silicon steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210302688.3A CN114643288A (en) | 2022-03-25 | 2022-03-25 | Method for improving rolling warping of low-temperature non-oriented silicon steel |
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| CN114643288A true CN114643288A (en) | 2022-06-21 |
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| CN202210302688.3A Pending CN114643288A (en) | 2022-03-25 | 2022-03-25 | Method for improving rolling warping of low-temperature non-oriented silicon steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5219798A (en) * | 1989-09-22 | 1993-06-15 | Kabushiki Kaisha Toshiba | Method of heating a semiconductor substrate capable of preventing defects in crystal from occurring |
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| JP2011079026A (en) * | 2009-10-08 | 2011-04-21 | Sumitomo Metal Ind Ltd | Method for manufacturing thick plate |
| JP2012187603A (en) * | 2011-03-09 | 2012-10-04 | Jfe Steel Corp | METHOD FOR PREVENTING UPWARD WARPAGE IN HOT ROLLING LINE OF HIGH Si STEEL |
| CN102836882A (en) * | 2012-08-20 | 2012-12-26 | 河北省首钢迁安钢铁有限责任公司 | Method for removing raising head caused by tape threading of hot rolled strip steel |
| KR20130053836A (en) * | 2011-11-16 | 2013-05-24 | 주식회사 포스코 | Method for upward bending reduction of slab in roughrolling process |
| CN103128106A (en) * | 2011-11-25 | 2013-06-05 | 宝山钢铁股份有限公司 | Control method for head warping or head down bending for heavy plate rolling |
| CN104624665A (en) * | 2015-01-09 | 2015-05-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling rough rolling squat in continuous hot rolling strip |
| CN109365530A (en) * | 2018-10-09 | 2019-02-22 | 鞍钢股份有限公司 | A kind of high-level non-orientation silicon steel hot continuous rolling process |
| CN111112346A (en) * | 2019-12-27 | 2020-05-08 | 攀钢集团西昌钢钒有限公司 | Control method for pipeline steel finish rolling tapping warped head |
| CN111266416A (en) * | 2020-01-21 | 2020-06-12 | 鞍钢股份有限公司 | Production method for controlling warping of non-oriented silicon steel rough rolling plate blank |
| CN113058998A (en) * | 2021-03-18 | 2021-07-02 | 鞍钢股份有限公司 | Method for preventing hot-rolled edge crack of low-temperature heating oriented silicon steel |
-
2022
- 2022-03-25 CN CN202210302688.3A patent/CN114643288A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5219798A (en) * | 1989-09-22 | 1993-06-15 | Kabushiki Kaisha Toshiba | Method of heating a semiconductor substrate capable of preventing defects in crystal from occurring |
| JP2005152953A (en) * | 2003-11-26 | 2005-06-16 | Jfe Steel Kk | Method for suppressing warp of high silicon steel material at its tip end |
| JP2011079026A (en) * | 2009-10-08 | 2011-04-21 | Sumitomo Metal Ind Ltd | Method for manufacturing thick plate |
| JP2012187603A (en) * | 2011-03-09 | 2012-10-04 | Jfe Steel Corp | METHOD FOR PREVENTING UPWARD WARPAGE IN HOT ROLLING LINE OF HIGH Si STEEL |
| KR20130053836A (en) * | 2011-11-16 | 2013-05-24 | 주식회사 포스코 | Method for upward bending reduction of slab in roughrolling process |
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| CN111266416A (en) * | 2020-01-21 | 2020-06-12 | 鞍钢股份有限公司 | Production method for controlling warping of non-oriented silicon steel rough rolling plate blank |
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