CN111889510A - Stainless steel strip production method for reducing side turn line width of hot rolled steel strip - Google Patents
Stainless steel strip production method for reducing side turn line width of hot rolled steel strip Download PDFInfo
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- CN111889510A CN111889510A CN202010601379.7A CN202010601379A CN111889510A CN 111889510 A CN111889510 A CN 111889510A CN 202010601379 A CN202010601379 A CN 202010601379A CN 111889510 A CN111889510 A CN 111889510A
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- steel strip
- stainless steel
- edge
- strip
- width
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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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- B21B1/38—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 sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
Abstract
The invention discloses a method for producing a stainless steel strip capable of reducing the side edge line-turning width of a hot-rolled steel strip, which adopts the production processes of stainless steel smelting, casting blank forming, hot rolling, annealing and pickling treatment, cold rolling, cold plate annealing and pickling and coil splitting and slicing to prepare the stainless steel strip. According to the production method of the stainless steel strip for reducing the side turn line width of the edge of the hot rolled steel strip, the sharp corner of the edge of the steel strip is rolled into the fillet for multiple times in the rough rolling process of the steel strip, so that the heat transfer of the edge of the steel strip can be improved, the ductility of the edge of the steel strip can be improved, the side turn line width of the rolled steel strip can be reduced, the edge cutting amount during edge cutting treatment can be reduced, the production yield of the steel strip can be improved, and the production cost.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a production method of a stainless steel strip for reducing the side turning line width of the edge of a hot-rolled steel strip.
Background
The traditional stainless steel band production process mainly comprises the following steps: smelting stainless steel, casting to form a blank, hot rolling, annealing/pickling, cold rolling, cold plate annealing and pickling, and coiling/slicing. The hot rolling process of the stainless steel can be divided into a rough rolling process and a finish rolling process, wherein the rough rolling process is used for rolling the steel billet from the thickness of a casting blank to the intermediate thickness, and the finish rolling process is used for rolling the steel billet from the intermediate thickness to the thickness of a finished product.
At present, in the rough rolling deformation process of a steel billet, because the corners of the steel billet are subjected to bidirectional heat dissipation, under the action of high-pressure water descaling and natural temperature drop, the temperature of the corners of the steel billet is greatly reduced compared with that of other parts, so that the metal fluidity of the corners is poor compared with that of other positions, the metal elongation of the corners is inconsistent with that of other positions of a plate surface in the rolling process, and the elongation difference finally forms a continuous crease mark with a certain depth on the edge of the steel strip, wherein the crease mark is generally called a side-turning line. The side rollover lines are generally in the shape of linear rough imprints and are distributed within the range of 10-20mm from the side edges of the hot rolled steel strip.
Because the finished steel strip product is required not to have side-turning lines, at present, in order to ensure that the final steel strip product meets the requirements, the steel strip needs to be subjected to edge cutting after hot rolling to cut the side-turning lines at the edges of the steel strip. However, since the trimming process requires cutting off a portion of the steel strip, the yield of steel strip production is reduced, and the steel strip production cost is increased.
Therefore, the development of a method for producing a stainless steel strip capable of reducing the side edge turn-over width of a hot-rolled steel strip has become a technical problem to be solved by those skilled in the art, and the method reduces the side edge turn-over width of the hot-rolled steel strip to reduce the trimming amount.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the method for producing the stainless steel strip capable of reducing the width of the side overturning line at the edge of the hot-rolled steel strip, which can shorten the width of the side overturning line on the hot-rolled steel strip to reduce the trimming amount, improve the yield of the steel strip production and reduce the production cost.
Therefore, the invention discloses a production method of a stainless steel strip for reducing the side edge line-turning width of a hot-rolled steel strip, which comprises the steps of preparing the stainless steel strip by adopting stainless steel smelting, casting and blank forming, hot rolling, annealing and pickling treatment, cold rolling, cold plate annealing and pickling and coil splitting and slicing production processes, and also comprises the step of processing the upper edge and the lower edge of the two side edges of the steel strip to be rolled into round corners in the rough rolling process of the steel strip.
Further, in the above method for producing a stainless steel strip to reduce the side-turn line width of the hot rolled steel strip, the upper and lower edges of the two side portions of the steel strip to be rolled are processed into rounded corners in the first three passes of rough rolling.
Further, in the above method for producing a stainless steel strip to reduce the side edge line width of a hot rolled steel strip, edge rounding rollers are provided at the front and rear ends of a main roller of a roughing mill to process the upper and lower edges of the two side edges of the steel strip to be rolled into a rounded shape.
Further, in the above method for producing a stainless steel strip to reduce the side strip width of a hot rolled steel strip, four edge rounding rollers are provided at both the front and rear ends of a main roller of a roughing mill, and each of the four edge rounding rollers at the front and rear ends of the main roller corresponds to each of the four edges of the steel strip.
Further, in the above method for producing a stainless steel strip with a reduced side strip line width, the side rounding rolls provided at the front ends of the main rolls of the roughing mill are positioned at the front ends of the vertical rolls of the roughing mill.
Further, in the above method for producing a stainless steel strip which reduces the side strip side rollover line width of a hot rolled steel strip, the width and height between the four side rounding rollers at the front end and the rear end of the main roller are adjusted in real time according to the width and thickness of the steel strip.
Further, in the above method for producing a stainless steel strip with reduced side strip width, the width between the four side rounding rollers at the front end and the rear end of the main roller is controlled in linkage with the width of the vertical roller of the roughing mill, and the height between the four side rounding rollers at the front end and the rear end of the main roller is controlled in linkage with the height of the main roller of the roughing mill.
The technical scheme of the invention has the following main advantages:
according to the stainless steel strip production method for reducing the side edge side turn line width of the hot rolled steel strip, the side edge rounding rollers are arranged at the front end and the rear end of the main roller of the roughing mill, so that the sharp corners of the side edge of the steel strip are rolled into round corners for multiple times in the roughing process of the steel strip, the heat transfer of the side edge of the steel strip can be improved, the ductility of the side edge of the steel strip is improved, the side turn line width of the rolled steel strip is reduced, the side cut amount in the side cut treatment is reduced, the steel strip production yield is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic layout view of edge rounding rollers in a method for producing a stainless steel strip with reduced width of an edge side rollover line of a hot-rolled steel strip according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
An embodiment of the invention provides a method for producing a stainless steel strip capable of reducing the side edge line-turning width of a hot-rolled steel strip, which comprises the following steps: the stainless steel strip is prepared by adopting the traditional production processes of stainless steel smelting, casting blank forming, hot rolling, annealing and pickling treatment, cold rolling, cold plate annealing and pickling and coil splitting and slicing, and the upper and lower edges of the two side parts of the steel strip to be rolled are processed into round corners in the rough rolling process of the steel strip.
Specifically, in the method for producing a stainless steel strip to reduce the width of the side edge line of the hot rolled steel strip, a finished stainless steel strip is prepared by using a traditional stainless steel strip preparation process including stainless steel smelting, casting and blank forming, hot rolling, annealing and pickling treatment, cold rolling, cold plate annealing and pickling, and coil splitting and slicing, and when the steel strip is subjected to hot rolling after the casting and blank forming, the upper and lower edges of the two side edges of the steel strip to be rolled are processed into a fillet shape before each pass of rough rolling; therefore, the area of the corner of the steel strip can be reduced, the corner heat dissipation is reduced, the temperature of the corner is increased, the ductility of the corner is improved, and the distance between the side-turning line and the edge of the steel strip is shortened.
Optionally, in an embodiment of the present invention, in the first three passes of rough rolling, the upper and lower edges of the two side portions of the steel strip to be rolled are processed into rounded corners.
In the rough rolling process of the steel strip, the upper and lower edges of the two side parts of the steel strip to be rolled are processed into round corners; in the method for producing a stainless steel strip to reduce the side edge turn line width of a hot rolled steel strip according to an embodiment of the present invention, edge rounding rollers are disposed at the front and rear ends of a main roller of a roughing mill, so as to process the upper and lower edges of the two side edges of the steel strip to be rolled into a rounded shape.
Further, because the two side edges of the steel strip are provided with four edges, in one embodiment of the invention, in order to facilitate rounding the four edges of the steel strip, four edge rounding rollers are respectively arranged at the front end and the rear end of a main roller of the roughing mill, and the four edge rounding rollers at the front end and the rear end of the main roller respectively correspond to the four edges of the steel strip one by one.
Alternatively, in an embodiment of the present invention, the edge rounding roller provided at the front end of the main roller of the roughing mill may be provided at the front end of the vertical roller of the roughing mill.
In the rough rolling process of the steel strip, the size of the steel strip is changed after the steel strip is rolled for one time; in one embodiment of the present invention, the width and height between the four edge rounding rollers at the front end and the rear end of the main roller are adjusted in real time according to the width and thickness of the steel strip billet.
Optionally, in an embodiment of the present invention, a width between the four edge rounding rollers at the front end and the rear end of the main roller is controlled in linkage with a width of a vertical roller of the roughing mill, and a height between the four edge rounding rollers at the front end and the rear end of the main roller is controlled in linkage with a height of the main roller of the roughing mill. By the arrangement, the edge rounding rollers at the front end and the rear end of the main roller can be ensured to keep proper contact positions with the corners of the steel billet so as to roll the sharp corners of the edges of the steel billet into round corners.
In order to make the technical solutions of the present invention more clear, the following will clearly and completely describe the technical solutions of the present invention with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.
Example 1
Taking the preparation of a 304 stainless steel strip as an example, a casting blank obtained by smelting and casting stainless steel into a blank has the width of 1485mm, the thickness of 200mm and the length of 10.2mm, and a 2250mm sendzimir hot continuous rolling mill is adopted in the stainless steel hot rolling process.
In the process of rough rolling of the steel strip, the rough rolling process is designed into five passes, the first pass is rolled from 200mm to 140mm, the second pass is rolled from 140mm to 98mm, the third pass is rolled from 98mm to 69mm, the fourth pass is rolled from 69mm to 48mm, the fifth pass is rolled from 48mm to 33mm, before the first three passes of rolling, edge rounding rollers are used for rolling sharp corners of edges of the steel strip into round corners, and the thickness of the edge rounding rollers is set as shown in table 1.
| Rough rolling pass | Front end edge rounding roller | Rear end edge rounding roller |
| First pass | 200mm | 140mm |
| Second pass | 98mm | / |
| The third pass | / | 69mm |
TABLE 1 edge rounding roll thickness parameters
In one embodiment of the invention, the embodiment in which the edge rounding treatment of the steel strip is performed in the rough rolling process is compared with the comparative example in which the edge rounding treatment of the steel strip is not performed in the rough rolling process, and the side-rollover lines on the hot-rolled steel strip obtained after the edge rounding treatment are all shifted outward by 4-6 mm toward the edges. Therefore, in the subsequent trimming treatment, the trimming width of the hot-rolled steel strip obtained after the edge rounding treatment can be reduced by 4mm, the production yield of the steel strip can be obviously improved, and the production cost is reduced.
Therefore, according to the stainless steel strip production method for reducing the side edge turn line width of the hot-rolled steel strip, provided by the embodiment of the invention, the edge rounding rollers are arranged at the front end and the rear end of the main roller of the roughing mill, so that the sharp corners of the edges of the steel strip are rolled into round corners for multiple times in the roughing process of the steel strip, the heat transfer of the edges of the steel strip can be improved, the ductility of the edges of the steel strip is improved, the side turn line width of the rolled steel strip is reduced, the edge cutting amount in the edge cutting process is reduced, the steel strip production yield is improved.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A production method of a stainless steel strip capable of reducing the side edge line-turning width of a hot rolled steel strip comprises the steps of stainless steel smelting, casting and blank forming, hot rolling, annealing and pickling treatment, cold rolling, cold plate annealing and pickling and coil splitting and slicing production processes to prepare the stainless steel strip.
2. The method for producing a stainless steel strip with reduced side strip edge line width of a hot-rolled steel strip as claimed in claim 1, wherein the upper and lower edges of the two side edges of the steel strip to be rolled are rounded in the first three passes of rough rolling.
3. The method for producing a stainless steel strip with reduced side strip rollover line width of the hot rolled steel strip as claimed in claim 1 or 2, wherein both upper and lower edges of both side edges of the steel strip to be rolled are processed into round corners by providing side rounding rolls at both front and rear ends of the main roll of the roughing mill.
4. The method of claim 3, wherein four edge rounding rollers are provided at each of the front and rear ends of the main roller of the roughing mill, and wherein each of the four edge rounding rollers at the front and rear ends of the main roller corresponds to each of the four edges of the steel strip.
5. The method for producing a stainless steel strip with a reduced side strip rollover line width as recited in claim 3 or 4, wherein the edge rounding rolls provided at the front ends of the main rolls of the roughing mill are located at the front ends of the vertical rolls of the roughing mill.
6. The method of producing a stainless steel strip with reduced side strip rollover line width in accordance with claim 4 wherein the width and height between each of the four side rounding rollers at the front and rear ends of the main rollers is adjusted in real time in accordance with the width and thickness of the strip.
7. The method of producing a stainless steel strip with reduced side strip rollover line width in accordance with claim 6 wherein the width between each of the four side rounding rollers at the front and rear ends of the main roller is controlled in conjunction with the width of the vertical rolls of the roughing mill and the height between each of the four side rounding rollers at the front and rear ends of the main roller is controlled in conjunction with the height of the main roller of the roughing mill.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010601379.7A CN111889510A (en) | 2020-06-29 | 2020-06-29 | Stainless steel strip production method for reducing side turn line width of hot rolled steel strip |
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| CN202010601379.7A CN111889510A (en) | 2020-06-29 | 2020-06-29 | Stainless steel strip production method for reducing side turn line width of hot rolled steel strip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112547797A (en) * | 2020-11-23 | 2021-03-26 | 山西太钢不锈钢股份有限公司 | Comprehensive control method for width and side turning of 430 stainless steel |
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| CN112547797B (en) * | 2020-11-23 | 2022-07-08 | 山西太钢不锈钢股份有限公司 | Comprehensive control method for width and side turning of 430 stainless steel |
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Application publication date: 20201106 |