CN113578960B - Hot rolling production method of low-grade non-oriented silicon steel with quality control of edge - Google Patents
Hot rolling production method of low-grade non-oriented silicon steel with quality control of edge Download PDFInfo
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- CN113578960B CN113578960B CN202110856401.7A CN202110856401A CN113578960B CN 113578960 B CN113578960 B CN 113578960B CN 202110856401 A CN202110856401 A CN 202110856401A CN 113578960 B CN113578960 B CN 113578960B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- B21B2001/225—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 by hot-rolling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention particularly relates to a hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality, which belongs to the technical field of non-oriented silicon steel hot rolling production, and comprises the following steps: performing first rough rolling on a slab of low-grade non-oriented silicon steel, and performing second rough rolling on the slab after the first rough rolling, wherein a vertical roll lubricating device is arranged on a vertical roll before a second rough rolling mill, and the oil quantity of lubricating oil supplied to the vertical roll by the vertical roll lubricating device is 100-400 mL/min; performing fine descaling, finish rolling and coiling on the slab subjected to the second rough rolling to obtain a hot rolled coil with qualified edge quality; the good vertical roll surface state is ensured, the rough side part can be effectively solved, the rough side part state of low-grade non-oriented silicon steel is effectively solved, the rough side rolling rate of the cold rolling post-process is greatly improved, and the full-process yield of the silicon steel is improved.
Description
Technical Field
The invention belongs to the technical field of non-oriented silicon steel hot rolling production, and particularly relates to a hot rolling production method of low-grade non-oriented silicon steel with edge quality controlled.
Background
The low-grade non-oriented silicon steel hot rolling production technology is mature and stable, and can stably supply materials in batches, but the quality state of the hot rolling raw material hemming part directly determines whether the rough edge rolling can be realized in the cold rolling post-process. The silicon content of low-grade non-oriented silicon steel is about 1.0%, the side edge of the hot rolled coil is rough in snake skin shape, the quality defect of the side edge seriously affects the production rhythm of cold rolling and acid rolling, and the strip breakage is seriously caused.
At present, a set of targeted, complete and effective control method does not exist in the rough side state of the low-grade non-oriented silicon steel, so that trimming production is needed in the production process of the post-working procedure of the silicon steel, the cutting loss is high, and the rough edge rolling cannot be realized in batches.
Disclosure of Invention
The present invention has been made in view of the above problems, and has been made to provide a hot rolling production method of low grade non-oriented silicon steel for controlling the quality of edges, which overcomes or at least partially solves the above problems.
The embodiment of the invention provides a hot rolling production method of low-grade non-oriented silicon steel with controlled edge quality, which comprises the following steps:
performing first rough rolling on a slab of low-grade non-oriented silicon steel,
performing second rough rolling on the slab after the first rough rolling, wherein a vertical roll lubricating device is arranged on a vertical roll before the second rough rolling, and the oil quantity of lubricating oil supplied to the vertical roll by the vertical roll lubricating device is 100mL/min-400mL/min;
and (3) performing fine descaling, finish rolling and coiling on the slab subjected to the second rough rolling to obtain the hot rolled coil with high edge quality.
Optionally, in the first rough rolling of the slab of the low-grade non-oriented silicon steel, the actual steel passing amount of the vertical roll before the first rough rolling is not more than 4 ten thousand tons.
Optionally, in the second rough rolling of the slab after the first rough rolling, the width reduction of each pass of the vertical roll before the second rough rolling is controlled to be less than or equal to 20mm.
Optionally, before the first rough rolling of the slab of the low-grade non-oriented silicon steel, the slab is subjected to blank optimization, and the difference between the nominal width of the slab and the target width (namely the hot-rolling order width) is controlled to be 0-20 mm.
Optionally, in the process of performing the first rough rolling and the second rough rolling, the first rough rolling is performed for 1-3 times, and the second rough rolling is performed for 3-5 times.
Optionally, when the actual steel passing amount of the first roughing vertical roll exceeds 4 kilotons, the first roughing is rolled for 1 pass, and the second roughing is rolled for 5 passes.
Optionally, after all rolling passes of the second rough rolling are completed, the slab is air cooled without starting water descaling.
Optionally, the difference between the nominal width of the slab and the target width (i.e. the heat roll order width) is controlled between 40mm and 150mm.
Optionally, the main components of the low-grade non-oriented silicon steel include: the mass percent of the C element is less than 0.01 percent, the mass percent of the Si element is 0.3 to 1.5 percent, and the mass percent of the Mn element is 0.1 to 0.7 percent.
Optionally, in the first rough rolling of the slab of the low-grade non-oriented silicon steel, a vertical roll lubrication device is arranged on a vertical roll before the first rough rolling.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
the embodiment of the invention provides a hot rolling production method of low-grade non-oriented silicon steel with controlled edge quality, which comprises the following steps: performing first rough rolling on a slab of low-grade non-oriented silicon steel, and performing second rough rolling on the slab after the first rough rolling, wherein a vertical roll lubricating device is arranged on a vertical roll before a second rough rolling mill, and the oil quantity of lubricating oil supplied to the vertical roll by the vertical roll lubricating device is 100-400 mL/min; performing fine descaling, finish rolling and coiling on the slab subjected to the second rough rolling to obtain a hot rolled coil with qualified edge quality; the good vertical roll surface state is ensured, the rough side part can be effectively solved, the rough side part state of low-grade non-oriented silicon steel is effectively solved, the rough side rolling rate of the cold rolling post-process is greatly improved, and the full-process yield of the silicon steel is improved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 2 is a side profile view of a hot rolled coil prepared using prior art methods provided in the background;
FIG. 3 is a graph of the edge morphology of a hot rolled coil prepared by the method according to an embodiment of the present invention.
Detailed Description
The advantages and various effects of the present invention will be more clearly apparent from the following detailed description and examples. It will be understood by those skilled in the art that these specific embodiments and examples are intended to illustrate the invention, not to limit the invention.
Throughout the specification, unless specifically indicated otherwise, the terms used herein should be understood as meaning as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification will control.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods.
The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
according to an exemplary embodiment of the present invention, there is provided a hot rolling production method of low grade non-oriented silicon steel for controlling edge quality, which is applicable to hot rolled non-oriented silicon steel of the following composition system: the mass percent of the C element is less than 0.01%, the mass percent of the Si element is 0.3% -1.5%, the mass percent of the Mn element is 0.1% -0.7%, only the key elements are required to be described, and the method comprises the following steps: .
S1, optimizing the blank type of the plate blank, controlling the difference value between the nominal width of the plate blank and the width of the order of the hot rolled coil to be 0,20 mm and 40-150 mm, and avoiding the available and unused interval width reduction of the width fixing machine.
S2, adding a vertical roll lubrication device on an E2 vertical roll before a roughing mill R2 (namely, second roughing), wherein the lubrication device comprises: the oil tank is arranged on the vertical roll in front of the second roughing mill, in the embodiment, the oil tank is fixedly arranged on the vertical roll in front of the second roughing mill through bolts, in other embodiments, the oil tank can be fixedly arranged on the vertical roll in front of the second roughing mill through other modes such as welding and the like; one end of the oil delivery pipe is connected with the oil tank, and the other end of the oil delivery pipe is arranged on the surface of the vertical roller; the electromagnetic valve is arranged on the oil delivery pipe, the lubricating oil quantity is 100-400mL/min, the good vertical roller surface state is ensured, the condition that the vertical roller surface has no obvious hand feeling when touched is taken as the standard, and the rough edge can be effectively solved.
S3, controlling the period of the vertical roller, and under the condition that the E1 vertical roller before R1 is free from rolling lubrication, when the actual steel passing amount of E1 is more than 4 ten thousand tons (the steel passing amount can be properly prolonged when the E1 is put into rolling lubrication), not putting into rolling, and controlling the width reducing amount of each pass of E2 according to the width reducing amount of not more than 20mm.
S4, under the condition that E1 can be put in, the rough rolling mode is selected from 1+5 and 3+3, and when E1 is thrown for rolling, the rough rolling mode can only roll according to the 1+5 mode, so that the width reduction of each pass is effectively controlled, and the contact load of the vertical rolls and the side face of the intermediate blank is reduced.
S5, the descaling water in the rough rolling pass is strictly forbidden to start the water in the No. 5R 2 process, and poor side plasticity and side quality deterioration caused by sudden drop of the descaling water to the side temperature in the thinnest intermediate blank are prevented.
By adopting the design, through the rough rolling area vertical roll lubrication process, the vertical roll period control rolling, the reduction of each pass and the tissue control of the descaling water optimization of each pass, the rough side state of the low-grade non-oriented silicon steel is effectively solved, the rough edge rolling rate of the working procedure after cold rolling is greatly improved, the rough edge rolling rate is improved from 10% to more than 95%, and the full working procedure yield of the silicon steel is improved. The method provided by the embodiment is properly controlled, the scheme is complete, and the method is easy to master and convenient to operate and implement.
The hot rolling production method of the low grade non-oriented silicon steel of the present application for controlling the edge quality will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
The method comprises the steps of adding a vertical roll lubrication device on an E2 vertical roll in front of a roughing mill R2, putting into vertical roll lubrication, wherein the flow rate of lubricating oil is 150ml/min, improving the quality of the surface of the lower vertical roll by one grade, increasing the service cycle by 5-10 ten thousand tons to 25 ten thousand tons, adjusting the rough rolling mode according to the vertical roll period by 1+5 rough rolling modes, controlling the width reduction of each pass of R2 to be below 20mm, and enabling descaling water to be started for the 1 st pass according to the surface quality.
Example 2
The method comprises the steps of adding a vertical roll lubrication device on an E2 vertical roll in front of a roughing mill R2, adding vertical roll lubrication, and enabling the quality of the surface of the lower vertical roll to be improved by one grade, wherein the service period is increased by 5-10 ten thousand tons to 25 ten thousand tons, the rough rolling mode is 1+5, the rough rolling mode is adjusted according to the vertical roll period, the reduction of each pass of R2 is controlled below 20mm, and descaling water can be started for the 1 st pass according to the surface quality.
Example 3
The method comprises the steps of adding a vertical roll lubrication device on an E2 vertical roll in front of a roughing mill R2, putting into vertical roll lubrication, wherein the flow rate of lubricating oil is 200ml/min, improving the quality of the surface of the lower vertical roll by one grade, increasing the service cycle by 5-10 ten thousand tons to 25 ten thousand tons, adjusting the rough rolling mode according to the vertical roll period by 1+5 rough rolling modes, controlling the width reduction of each pass of R2 to be below 20mm, and enabling descaling water to be started for the 1 st pass according to the surface quality.
Example 4
The method comprises the steps of adding a vertical roll lubrication device on an E2 vertical roll in front of a roughing mill R2, putting into vertical roll lubrication, wherein the flow rate of lubricating oil is 200ml/min, improving the quality of the surface of the lower vertical roll by one grade, increasing the service cycle by 5-10 ten thousand tons to 25 ten thousand tons, and adjusting the rough rolling mode according to the vertical roll period by 3+3 rough rolling modes, wherein the reduction of each pass of R2 is controlled below 20mm, and the descaling water can be started for the 1 st pass according to the surface quality.
Comparative example 1
The method comprises the steps of adding a vertical roll lubrication device on an E2 vertical roll in front of a roughing mill R2, putting into vertical roll lubrication, enabling the flow rate of lubricating oil to be 50ml/min, improving the quality of the surface of the lower vertical roll by one grade, increasing the service cycle by 5-10 ten thousand tons to 25 ten thousand tons, adjusting the rough rolling mode according to the vertical roll period by 1+5 rough rolling modes, controlling the width reduction of each pass of R2 to be below 20mm, and enabling descaling water to be started for the 1 st pass according to the surface quality.
Comparative example 2
The method comprises the steps of adding a vertical roll lubrication device on an E2 vertical roll in front of a roughing mill R2, putting into vertical roll lubrication, wherein the flow rate of lubricating oil is 550ml/min, improving the quality of the surface of the lower vertical roll by one grade, increasing the service cycle by 5-10 ten thousand tons to 25 ten thousand tons, adjusting the rough rolling mode according to the vertical roll period by 1+5 rough rolling modes, controlling the width reduction of each pass of R2 to be below 20mm, and enabling descaling water to be started for the 1 st pass according to the surface quality.
Related experiments:
the hot rolled coils produced in examples 1 to 4 and comparative examples 1 to 2 were examined, and the results are shown in the following table.
| Incidence of edge roughness | Edge burr rolling rate | |
| Example 1 | 20％ | 80％ |
| Example 2 | 3％ | 97％ |
| Example 3 | 5％ | 95％ |
| Example 4 | 15％ | 85％ |
| Comparative example 1 | 30％ | 70％ |
| Comparative example 2 | 2％ | 98％ |
| Prior Art | 90％ | 10％ |
According to the table, the rough occurrence rate of the prepared hot rolled edge is controlled to be below 3% by adopting the method provided by the embodiment of the invention through a rough rolling area vertical roll lubrication process, vertical roll period control rolling, reduction of each pass of width reduction and tissue control of each pass of descaling water optimization, and the rough rolling rate of the strip steel edge is improved to be above 95% from 10% in the prior art.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) The method provided by the embodiment of the invention effectively solves the rough side state of low-grade non-oriented silicon steel by a rough rolling area vertical roll lubrication process, vertical roll period control rolling, reduction of each pass width and tissue control of each pass descaling water optimization, greatly improves the rough side rolling rate of the working procedure after cold rolling, improves the rough side rolling rate from 10% to more than 95%, and improves the yield of the whole working procedure of the silicon steel;
(2) The method provided by the embodiment of the invention is properly controlled, the scheme is complete in matching, easy to master and convenient to operate and implement.
Finally, it is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A hot rolling production method of low-grade non-oriented silicon steel with controlled edge quality is characterized by comprising the following steps:
performing first rough rolling on a slab of low-grade non-oriented silicon steel;
performing second rough rolling on the slab after the first rough rolling, wherein a vertical roll lubricating device is arranged on a vertical roll before the second rough rolling, and the oil quantity of lubricating oil supplied to the vertical roll by the vertical roll lubricating device is 100mL/min-400mL/min;
performing fine descaling, finish rolling and coiling on the slab subjected to the second rough rolling to obtain a hot rolled coil with qualified edge quality;
in the second rough rolling of the slab after the first rough rolling, the width reduction of each pass of the vertical roll before the second rough rolling is controlled to be less than or equal to 20mm;
and in the processes of the first rough rolling and the second rough rolling, the first rough rolling is carried out for 1-3 times, the second rough rolling is carried out for 3-5 times, and the descaling water in the rough rolling is strictly forbidden to start the water in the 5 th pass of R2.
2. The hot rolling production method of low grade non-oriented silicon steel with controlled edge quality according to claim 1, wherein the actual steel passing amount of the vertical rolls before the first rough rolling is not more than 4 ten thousand tons in the first rough rolling of the slab of low grade non-oriented silicon steel.
3. The hot rolling production method of low grade non-oriented silicon steel with controlled edge quality according to claim 1, wherein the slab is subjected to blank optimization before the slab of the low grade non-oriented silicon steel is subjected to rough rolling for the first time, and the difference between the nominal width of the slab and the target width is controlled to be 0mm-20mm.
4. The hot rolling production method of low grade non-oriented silicon steel with controlled edge quality according to claim 1, wherein the first rough rolling is performed for 1 pass and the second rough rolling is performed for 5 passes when the actual steel passing amount of the first rough rolling vertical roll exceeds 4 ten thousand tons.
5. The hot rolling production method of low grade non-oriented silicon steel with controlled edge quality according to claim 1, wherein the slab is air cooled after all rolling passes of the second rough rolling are completed.
6. The hot rolling production method of low grade non-oriented silicon steel with controlled edge quality according to claim 1, wherein the difference between the nominal width of the slab and the target width is controlled to be 40mm-150mm.
7. The hot rolling production method of low grade non-oriented silicon steel with controlled edge quality according to claim 1, wherein the main components of the low grade non-oriented silicon steel include: the mass percent of the C element is less than 0.01 percent, the mass percent of the Si element is 0.3 to 1.5 percent, and the mass percent of the Mn element is 0.1 to 0.7 percent.
8. The hot rolling production method of low grade non-oriented silicon steel with controlled edge quality according to claim 1, wherein in the first rough rolling of the slab of low grade non-oriented silicon steel, a vertical roll lubrication device is arranged on the vertical roll before the first rough rolling machine.
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| CN107497877A (en) * | 2017-06-02 | 2017-12-22 | 首钢总公司 | A kind of method for producing IF steel |
| CN109365530B (en) * | 2018-10-09 | 2020-09-01 | 鞍钢股份有限公司 | Hot continuous rolling production method of high-grade non-oriented silicon steel |
| CN109590339B (en) * | 2018-12-06 | 2020-09-01 | 武汉钢铁有限公司 | Hot-rolled edge quality control method of low-temperature high-magnetic-induction oriented silicon steel |
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