阅读说明：本技术 一种控制边部质量的低牌号无取向硅钢的热轧生产方法 (Hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality ) 是由 焦晋沙 霍光帆 曹瑞芳 李树强 李二军 刘伟伟 罗旭烨 陶永强 于 2021-07-28 设计创作，主要内容包括：本发明特别涉及一种控制边部质量的低牌号无取向硅钢的热轧生产方法,属于无取向硅钢热轧生产技术领域,方法包括：将低牌号无取向硅钢的板坯进行第一次粗轧,将第一次粗轧后的板坯进行第二次粗轧,其中,在第二次粗轧机前的立辊上设置立辊润滑装置,所述立辊润滑装置向所述立辊供给的润滑油的油量为100mL/min-400mL/min；将第二次粗轧后的板坯进行精除鳞、精轧和卷取,获得边部质量合格的热轧卷；保证良好的立辊辊面状态,可有效解决边部粗糙,有效解决了低牌号无取向硅钢边部粗糙状态,极大的提高了冷轧后工序毛边轧制率,提高了硅钢全工序成材率。(The invention particularly relates to a hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality, belonging to the technical field of hot rolling production of non-oriented silicon steel, and the method comprises the following steps: carrying out primary rough rolling on a low-grade non-oriented silicon steel plate blank, and carrying out secondary rough rolling on the plate blank after the primary rough rolling, wherein a vertical roll lubricating device is arranged on a vertical roll in front of the secondary rough rolling machine, and the oil amount of lubricating oil supplied to the vertical roll by the vertical roll lubricating device is 100-400 mL/min; performing fine descaling, fine rolling and coiling on the plate blank subjected to the secondary rough rolling to obtain a hot rolled coil with qualified edge quality; the good vertical roll surface state is guaranteed, the problem of rough edges can be effectively solved, the problem of rough edges of low-grade non-oriented silicon steel is effectively solved, the process burr rolling rate after cold rolling is greatly improved, and the overall process yield of the silicon steel is improved.)

1. A hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality is characterized by comprising the following steps:

carrying out primary rough rolling on a low-grade non-oriented silicon steel plate blank;

carrying out secondary rough rolling on the plate blank after the primary rough rolling, wherein a vertical roll lubricating device is arranged on a vertical roll in front of the secondary rough rolling machine, and the oil quantity of lubricating oil supplied to the vertical roll by the vertical roll lubricating device is 100-400 mL/min;

and (4) performing fine descaling, fine rolling and coiling on the plate blank subjected to the secondary rough rolling to obtain a hot rolled coil with qualified edge quality.

2. The method for hot rolling low-grade non-oriented silicon steel for controlling edge quality as claimed in claim 1, wherein in the first rough rolling of the slab of low-grade non-oriented silicon steel, the actual steel passing amount of the vertical rolls before the first rough rolling is not more than 4 ten thousand tons.

3. The hot rolling method for producing low-grade non-oriented silicon steel with controlled edge quality as claimed in claim 1, wherein 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 20 mm.

4. The hot rolling method for producing low-grade non-oriented silicon steel for controlling edge quality as claimed in claim 1, wherein before the slab of low-grade non-oriented silicon steel is subjected to the first rough rolling, the slab is subjected to slab shape optimization, and the difference between the nominal width of the slab and the target width is controlled to be 0mm-20 mm.

5. The hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality as claimed in claim 1, wherein the first rough rolling is performed for 1 to 3 passes and the second rough rolling is performed for 3 to 5 passes during the first and second rough rolling.

6. The method for hot rolling low-grade non-oriented silicon steel for controlling edge quality as claimed in claim 5, 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.

7. The hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality as claimed in claim 1, wherein the slab is air-cooled after all the rolling passes of the second rough rolling are completed.

8. The hot rolling production method of low-grade non-oriented silicon steel for controlling 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 to 150 mm.

9. The hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality according to claim 1, wherein the main components of the low-grade non-oriented silicon steel comprise: 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.

10. The method for hot rolling low-grade non-oriented silicon steel for controlling edge quality as claimed in claim 1, wherein a vertical roll lubricating device is provided on a vertical roll before the first roughing mill in the first roughing rolling of the slab of low-grade non-oriented silicon steel.

Technical Field

The invention belongs to the technical field of non-oriented silicon steel hot rolling production, and particularly relates to a low-grade non-oriented silicon steel hot rolling production method for controlling edge quality.

Background

The hot rolling production technology of the low-grade non-oriented silicon steel is mature and stable, and can stably supply materials in batches, but the quality state of the edge rolling part of the hot rolling raw material directly determines whether the process can realize rough edge rolling after cold rolling. The silicon content of the low-grade non-oriented silicon steel is about 1.0 percent, the side part of the hot-rolled coil is rough in a snake skin shape, the quality defects of the side part seriously influence the production rhythm of cold rolling and acid rolling, and the strip breakage is seriously caused.

At present, no targeted, complete and effective control method for the rough state of the edge of the low-grade non-oriented silicon steel exists, so that the edge cutting production is required in the post-procedure production process of the silicon steel, the cutting loss is high, and the rough edge rolling cannot be realized in batches.

Disclosure of Invention

In view of the above problems, the present invention has been made to provide a hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality, 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 for controlling edge quality, which comprises the following steps:

carrying out primary rough rolling on a low-grade non-oriented silicon steel plate blank,

carrying out secondary rough rolling on the plate blank after the primary rough rolling, wherein a vertical roll lubricating device is arranged on a vertical roll in front of the secondary rough rolling machine, and the oil quantity of lubricating oil supplied to the vertical roll by the vertical roll lubricating device is 100-400 mL/min;

and (3) performing fine descaling, fine rolling and coiling on the plate blank subjected to the secondary rough rolling to obtain a hot rolled coil with high edge quality.

Optionally, in the first rough rolling of the low-grade non-oriented silicon steel slab, 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 amount of each pass of the vertical roll before the second rough rolling is controlled to be less than or equal to 20 mm.

Optionally, before the slab of the low-grade non-oriented silicon steel is subjected to the first rough rolling, the slab is subjected to blank type optimization, and the difference between the nominal width of the slab and the target width (i.e., the width of the hot coil order) is controlled to be 0mm-20 mm.

Optionally, in the first rough rolling and the second rough rolling, the first rough rolling is performed for 1 to 3 times, and the second rough rolling is performed for 3 to 5 times.

Optionally, when the actual steel passing amount of the first rough rolling vertical roll exceeds 4 ten thousand tons, the first rough rolling is performed for 1 pass, and the second rough rolling is performed for 5 passes.

Optionally, after all rolling passes of the second rough rolling are completed, the plate blank is air-cooled without starting water to remove scale.

Optionally, the difference between the nominal width of the slab and the target width (i.e. the order width of the hot coil) is controlled to be 40mm-150 mm.

Optionally, the main components of the low-grade non-oriented silicon steel comprise: 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, during the first rough rolling of the low-grade non-oriented silicon steel slab, a vertical roll lubricating device is arranged on a vertical roll in front of the first rough rolling machine.

One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:

the embodiment of the invention provides a hot rolling production method of low-grade non-oriented silicon steel for controlling edge quality, which comprises the following steps: carrying out primary rough rolling on a low-grade non-oriented silicon steel plate blank, and carrying out secondary rough rolling on the plate blank after the primary rough rolling, wherein a vertical roll lubricating device is arranged on a vertical roll in front of the secondary rough rolling machine, and the oil amount of lubricating oil supplied to the vertical roll by the vertical roll lubricating device is 100-400 mL/min; performing fine descaling, fine rolling and coiling on the plate blank subjected to the secondary rough rolling to obtain a hot rolled coil with qualified edge quality; the good vertical roll surface state is guaranteed, the problem of rough edges can be effectively solved, the problem of rough edges of low-grade non-oriented silicon steel is effectively solved, the process burr rolling rate after cold rolling is greatly improved, and the overall process yield of the silicon steel is improved.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;

FIG. 2 is a graph of the edge profile of a hot rolled coil prepared by a prior art method as provided in the background art;

FIG. 3 is a graph of the edge profile of a hot rolled coil made by the method of the present invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.

Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings 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. If there is a conflict, the present specification will control.

Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.

In order to solve the technical problems, the general idea of the embodiment of the application is as follows:

according to an exemplary embodiment of the present invention, there is provided a hot rolling method of producing a low-grade non-oriented silicon steel for controlling edge quality, which is suitable for a hot rolling non-oriented silicon steel of the following composition system: the mass percent of C element is less than 0.01 percent, the mass percent of Si element is 0.3-1.5 percent, the mass percent of Mn element is 0.1-0.7 percent, only the key elements are explained, and the method comprises the following steps: .

S1, slab blank type optimization, wherein the difference value between the nominal width of the slab and the width of the hot rolled coil order is controlled to be 0,20 mm and 40-150 mm, and the width reduction amount of the usable and unusable interval of the width fixing machine is avoided.

S2, adding a vertical roll lubricating device on an E2 vertical roll before the rough rolling machine R2 (namely the second rough rolling), wherein the lubricating device comprises the following components in specific implementation: an oil tank provided on the vertical roll before the second roughing mill, in the present embodiment, the oil tank is fixedly provided on the vertical roll before the second roughing mill by bolts, and in other embodiments, the oil tank may be fixedly provided on the vertical roll before the second roughing mill by other means such as welding; 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 oil amount of the lubricating oil is 100-400mL/min, the good roller surface state of the vertical roller is ensured, the condition that the roller surface of the vertical roller has no obvious hand feeling in touch is taken as a criterion, and the rough edge part can be effectively solved.

S3, controlling the roll period of the vertical rolls, and not putting the E1 into rolling when the actual steel passing amount of the E1 vertical rolls before R1 is not less than 4 ten thousand tons (the steel passing amount can be properly prolonged when the E1 is put into rolling lubrication), wherein the width reduction amount of each pass of E2 is controlled according to the width reduction amount not more than 20 mm.

S4, in the rough rolling mode, 1+5 and 3+3 can be selected under the condition that E1 can be put into use, and when E1 is thrown for rolling, the rough rolling mode can only roll according to the 1+5 mode, so that the width reducing amount of each pass is effectively controlled, and the contact load between the vertical roll and the side face of the intermediate billet is reduced.

S5, strictly opening the No. 5 secondary water of R2 in rough rolling pass descaling water, and preventing poor edge plasticity and poor edge quality caused by sudden drop of the descaling water to the edge temperature when the intermediate billet is thinnest.

By adopting the design, through the lubrication process of the vertical roll in the rough rolling area, the control rolling of the vertical roll period, the reduction of the width of each pass and the optimized structure control of the descaling water of each pass, the rough state of the edge of the low-grade non-oriented silicon steel is effectively solved, the burr rolling rate of the process after cold rolling is greatly improved, the burr rolling rate is improved from 10% to more than 95%, and the yield of the whole process of the silicon steel is improved. The method provided by the embodiment is properly controlled, the scheme is complete and easy to master, and the operation and implementation are convenient.

The hot rolling process of the low-grade non-oriented silicon steel for controlling edge quality according to the present application 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 lubricating device on an E2 vertical roll in front of a roughing mill R2, adding a vertical roll lubricating device, lubricating the vertical roll, wherein the lubricating oil flow is 150ml/min, the roll surface quality of the lower vertical roll is improved by one level, the service cycle is increased by 5-10 ten thousand tons to 25 ten thousand tons, the roughing mode is 1+5, the roughing mode is adjusted according to the roll period of the vertical roll, the width reduction amount of each pass of R2 is controlled to be less than 20mm, and the 1 st pass of descaling water can be respectively started according to the surface quality.

Example 2

The method comprises the steps of adding a vertical roll lubricating device on an E2 vertical roll in front of a roughing mill R2 to lubricate the vertical roll, wherein the flow rate of lubricating oil is 240ml/min, the roll surface quality of the lower vertical roll is improved by one level, the service cycle is increased by 5-10 ten thousand tons to 25 ten thousand tons, the roughing mode is 1+5, the roughing mode is adjusted according to the roll period of the vertical roll, the width reduction amount of each pass of R2 is controlled to be less than 20mm, and the 1 st pass of descaling water can be respectively started according to the surface quality.

Example 3

The method comprises the steps of adding a vertical roll lubricating device on an E2 vertical roll in front of a roughing mill R2, adding a vertical roll lubricating device, lubricating the vertical roll, enabling the flow of lubricating oil to be 200ml/min, improving the roll surface quality of the lower vertical roll by one level, simultaneously increasing the service cycle by 5-10 ten thousand tons to 25 ten thousand tons, adopting a roughing mode 1+5, adjusting the roughing mode according to the roll period of the vertical roll, controlling the width reduction amount of each pass of R2 to be less than 20mm, and enabling descaling water to be respectively started at the 1 st pass according to the surface quality.

Example 4

The method comprises the steps of adding a vertical roll lubricating device on an E2 vertical roll in front of a roughing mill R2, adding a vertical roll lubricating device, lubricating the vertical roll, enabling the flow of lubricating oil to be 200ml/min, improving the roll surface quality of the lower vertical roll by one level, simultaneously increasing the service cycle by 5-10 ten thousand tons to 25 ten thousand tons, adjusting a roughing mode according to the vertical roll period, controlling the width reduction amount of each pass of R2 to be less than 20mm, and enabling descaling water to be used in the 1 st pass according to the surface quality.

Comparative example 1

The method comprises the steps of adding a vertical roll lubricating device on an E2 vertical roll in front of a roughing mill R2, adding vertical roll lubrication, wherein the lubricating oil flow is 50ml/min, the roll surface quality of the lower vertical roll is improved by one level, the service cycle is increased by 5-10 ten thousand tons to 25 ten thousand tons, the roughing mode is 1+5, the roughing mode is adjusted according to the vertical roll period, the width reduction amount of each pass of R2 is controlled to be less than 20mm, and descaling water can be respectively started at the 1 st pass according to the surface quality.

Comparative example 2

The method comprises the steps of adding a vertical roll lubricating device on an E2 vertical roll in front of a roughing mill R2, adding vertical roll lubrication, wherein the flow rate of lubricating oil is 550ml/min, the roll surface quality of the lower vertical roll is improved by one level, the service cycle is increased by 5-10 ten thousand tons to 25 ten thousand tons, the roughing mode is 1+5, the roughing mode is adjusted according to the roll period of the vertical roll, the width reduction amount of each pass of R2 is controlled to be less than 20mm, and the 1 st pass of descaling water can be respectively started according to the surface quality.

Related experiments:

the hot rolled coils obtained 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	Rate of rolling of rough edges at edges
			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％

From the table, by adopting the method provided by the embodiment of the invention, through the rough rolling area vertical roll lubrication process, the vertical roll period control rolling, the width reduction amount of each pass and the optimized structure control of the descaling water of each pass, the roughness occurrence rate of the prepared hot rolled edge part is controlled to be below 3%, and the rough edge rolling rate of the strip steel edge part 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) according to the method provided by the embodiment of the invention, through the lubrication process of the vertical roll in the rough rolling area, the rolling control of the vertical roll period, the width reduction amount of each pass and the optimized organization control of the descaling water of each pass, the rough state of the edge of the low-grade non-oriented silicon steel is effectively solved, the burr rolling rate of the process after cold rolling is greatly improved, the burr rolling rate can be improved from 10% to more than 95%, and the yield of the whole process of the silicon steel is improved;

(2) the method provided by the embodiment of the invention has proper control, complete scheme matching, easy grasp and convenient operation and implementation.

Finally, it should also be 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.