CN112355061B - 300-series stainless steel wide and thick cold plate shape control method - Google Patents
300-series stainless steel wide and thick cold plate shape control method Download PDFInfo
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- CN112355061B CN112355061B CN202010993737.3A CN202010993737A CN112355061B CN 112355061 B CN112355061 B CN 112355061B CN 202010993737 A CN202010993737 A CN 202010993737A CN 112355061 B CN112355061 B CN 112355061B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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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
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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
- B21B2015/0057—Coiling the rolled product
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Abstract
The invention discloses a method for controlling the shape of a 300-series stainless steel wide and thick cold plate, which is used for rolling production of the stainless steel wide and thick cold plate and comprises the following steps: when rolling is carried out, different first-pass rolling deformation rates and last-pass rolling deformation rates are set according to the thickness of a stainless steel rolling raw material and the thickness of a finished product, and a rolling plate shape standard curve is set to be a symmetrical quartic curve form, so that transverse metal flow of a steel belt is balanced in the rolling process. According to the method for controlling the shape of the 300-series stainless steel wide and thick cold plate, the first-pass deformation rate and the last-pass deformation rate of rolling are controlled according to the thickness of the raw materials and the thickness of the finished product, and the rolling plate shape standard curve is optimally designed, so that transverse metal flow of a steel belt is balanced in the rolling process, the double-edge wave defect of the steel belt finished product can be eliminated, and the shape quality of the stainless steel wide and thick cold plate is obviously improved.
Description
Technical Field
The invention relates to the technical field of stainless steel rolling, in particular to a method for controlling the shape of a 300-series stainless steel wide and thick cold plate.
Background
The 300 series stainless steel wide and thick cold plate is a 300 series stainless steel cold plate with the width being more than or equal to 1500mm and the thickness being more than or equal to 2.5mm, the 300 series stainless steel is chromium-nickel series austenitic stainless steel, the 300 series stainless steel wide and thick cold plate has the characteristics of large width, thick thickness, good surface quality, high dimensional precision and the like, is widely applied to manufacturing deep drawing type parts, acid conveying pipelines, containers and the like, has high additional profit, and increases market demand year by year.
In practical use, the requirement on the shape of the stainless steel wide and thick cold plate is high, and the plate shape straightness of the finished cold plate is specifically required to be less than or equal to 10 mm. However, when the existing rolling production mode is adopted to roll and produce stainless steel wide and thick cold plates, the finished cold plate often has the defect of double edge waves in the form of 'coiling waves', the plate shape quality of the product is severely restricted, and the production cost is directly increased greatly.
Therefore, it is a technical problem to be solved by those skilled in the art to develop a method for controlling the shape of a 300-series stainless steel wide and thick cold plate capable of eliminating the double edge wave defect.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method for controlling the shape of a 300-series stainless steel wide and thick cold plate, which can eliminate the defect of double edge waves of a cold plate finished product and obviously improve the shape quality of the stainless steel wide and thick cold plate.
Therefore, the invention discloses a method for controlling the shape of a 300-series stainless steel wide and thick cold plate, which is used for rolling production of the stainless steel wide and thick cold plate and comprises the following steps:
when rolling is carried out, different first-pass rolling deformation rates and last-pass rolling deformation rates are set according to the thickness of a stainless steel rolling raw material and the thickness of a finished product, and a rolling plate shape standard curve is set to be a symmetrical quartic curve form, so that transverse metal flow of a steel belt is balanced in the rolling process.
In some alternative embodiments, the first pass deformation ratio and the last pass deformation ratio are in the following table according to the raw material thickness and the finished product thickness:
the setting is performed.
In some optional embodiments, the method further comprises: when each pass of rolling is performed, the plate shape value of each pass of side part is set to be 0-60N/mm 2.
In some optional embodiments, the method further comprises: when the steel strip is coiled on the finished product annealing and pickling production line, the tail coiling tension of the steel strip is set to be below 15000 kg.
In some optional embodiments, the method further comprises: when the steel strip is coiled on the finished product annealing and pickling production line, corrugated paper is padded in the middle of the steel strip in the width direction.
In some optional embodiments, when the steel strip is coiled in the finished product annealing and pickling line, 1-2 pieces of corrugated paper are padded in the middle position in the width direction of the steel strip.
The technical scheme of the invention has the following main advantages:
according to the method for controlling the shape of the 300-series stainless steel wide and thick cold plate, the first-pass deformation rate and the last-pass deformation rate of rolling are controlled according to the thickness of the raw material and the thickness of the finished product, and the rolling plate shape standard curve is optimally designed, so that the transverse metal flow of a steel belt is balanced in the rolling process, meanwhile, the coiling tension of the finished product annealing and pickling production line is optimally designed, and corrugated paper is padded in coiling, so that the double-edge wave defect of the finished product of the steel belt can be eliminated, and the shape quality of the stainless steel wide and thick cold plate is obviously 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 view of the transverse thickness profile of a stainless steel wide and thick cold plate before rolling;
FIG. 2 is a schematic diagram of the transverse thickness shape of a rolled stainless steel wide and thick cold plate;
FIG. 3 is a schematic diagram of a rolled plate shape standard curve 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 present invention provides a method for controlling a 300-series stainless steel wide and thick cold plate shape, which is used for rolling production of a stainless steel wide and thick cold plate, and includes:
when rolling is carried out, different first-pass rolling deformation rates and last-pass rolling deformation rates are set according to the thickness of a stainless steel rolling raw material and the thickness of a finished product, and a rolling plate shape standard curve is set to be a symmetrical quartic curve form, so that transverse metal flow of a steel belt is balanced in the rolling process.
The rolled plate shape standard curve is a curve of a plate shape control target, and is a distribution curve of a desired longitudinal residual stress of the rolled steel strip in the width direction.
When the existing rolling production mode is adopted to roll and produce the stainless steel wide and thick cold plate, the transverse thickness shape of the steel strip is changed, as shown in the attached drawings 1 and 2, the transverse thickness shape of the steel strip is changed from the middle thick inverted V-shaped shape with two thin sides of the raw material into the middle thin inverted V-shaped shape with two thick sides after rolling, the difference between the transverse thickness and the plate is larger, and the thickness of the side part is about 40 mu m thicker than the middle thickness. When the steel strip with the transverse thickness shape is annealed and softened and then coiled, the transverse thickness shape is a V shape with a thin middle part and two thick sides, and the difference between the transverse thickness shape and the plate is large, so that certain superposed stress is formed on the edge part, the coiling stress of the edge part is higher than that of the middle coiling stress, and when the two stresses are superposed to exceed the yield stress of the steel strip, plastic deformation can be generated in a certain area away from the edge part of the steel strip, and the double edge wave defect in the form of coiling waves is formed. According to the method for controlling the shape of the 300-series stainless steel wide and thick cold plate, provided by the embodiment of the invention, the first-pass deformation rate and the last-pass deformation rate of rolling are controlled according to the thickness of the raw material and the thickness of the finished product, and the standard curve of the rolled shape is optimally designed, so that the transverse metal flow of a steel belt is balanced in the rolling process, the double-edge wave defect of the finished product of the steel belt can be eliminated, and the shape quality of the stainless steel wide and thick cold plate is obviously improved.
Optionally, in an embodiment of the present invention, the first-pass rolling deformation rate and the last-pass rolling deformation rate are according to the following table according to the thickness of the stainless steel rolling raw material and the thickness of the finished product:
the setting is performed.
According to the arrangement, the deformation rate of the first pass and the last pass of rolling is controlled, the rolling pressure of each pass can be reasonably distributed, and the transverse metal flow abnormity caused by overlarge rolling pressure is effectively avoided.
In one embodiment of the present invention, the rolled plate shape standard curve takes the form of a symmetrical quartic curve as shown in fig. 3.
Optionally, when rolling is performed in each pass, the plate shape value of the edge of each pass is set to be 0-60N/mm based on the set standard curve of the rolled plate shape2。
Optionally, when rolling is performed in each pass, the plate shape value in the middle of each pass is set to be 0-40N/mm based on the set rolling plate shape standard curve2。
By the arrangement, the flow balance of the transverse metal in the rolling process of the steel strip can be improved by properly increasing the positive extension of the middle part and reducing the negative extension of the edge part.
Further, in an embodiment of the present invention, the control method further includes: when the steel strip is coiled on the finished product annealing and pickling production line, the tail coiling tension of the steel strip is set to be below 15000 kg.
By the arrangement, the phenomenon of uneven distribution of coiling tension can be reduced, and the plate shape quality of the steel strip is improved.
Further, in an embodiment of the present invention, the control method further includes: when the steel strip is coiled on the finished product annealing and pickling production line, corrugated paper is padded in the middle of the steel strip in the width direction.
Optionally, when the steel strip is coiled on the finished product annealing and pickling production line, 1-2 pieces of corrugated paper are padded in the middle of the steel strip in the width direction.
So set up, can guarantee that the middle part of steel band batches tension and is greater than or equal to limit portion and batches tension, improves the plate shape quality of steel band.
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
In this example 1, a roll of 304 steel type 2B plate with a specification of 3.0 × 1540mm is rolled by a wide rolling mill, the thickness of the stainless steel raw material is 5.5mm, the thickness of the finished product is 3.0mm, the rolling pass is set to 7 passes, the first-pass deformation rate is set to 17% and the last-pass deformation rate is set to 7% during the rolling process, the standard profile of each pass is in the form of a quartic curve as shown in fig. 3, and the profile values of the side plates of each pass are respectively set to 40N/mm2、35N/mm2、30N/mm2、25N/mm2、20N/mm2、10N/mm2、10N/mm2And the tail coiling tension of the steel strip in the finished product annealing and pickling production line is set to 10000kg, and 1 piece of corrugated paper is padded in the middle of the steel strip in the width direction during coiling.
And (3) carrying out steel strip shape inspection during longitudinal cutting production, wherein the steel strip shape is straight, the double-edge wave defect is not found, and the strip shape quality meets the actual production requirement.
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 (1)
1. A300-series stainless steel wide and thick cold plate shape control method is characterized in that the method is used for rolling production of stainless steel wide and thick cold plates and comprises the following steps:
when rolling is carried out, different first-pass rolling deformation rates and last-pass rolling deformation rates are set according to the thickness of a stainless steel rolling raw material and the thickness of a finished product, and a rolling plate shape standard curve is set to be a symmetrical fourth-pass curve form so as to balance the transverse metal flow of a steel belt in the rolling process;
the first pass deformation rate and the last pass deformation rate of rolling are according to the following table according to the thickness of the raw materials and the thickness of finished products:
Setting is carried out;
wherein the method further comprises: when the steel strip is coiled on the finished product annealing and pickling production line, the coiling tension at the tail part of the steel strip is set to be below 15000kg, and 1-2 pieces of corrugated paper are padded in the middle of the steel strip in the width direction, so that the coiling tension at the middle part of the steel strip is greater than or equal to the coiling tension at the edge part, and the plate shape quality of the steel strip is improved.
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| CN101587347B (en) * | 2008-05-22 | 2012-04-04 | 鞍钢股份有限公司 | Design method of cold rolling mill band steel shape control target model |
| CN104226720B (en) * | 2014-08-15 | 2016-05-25 | 山西太钢不锈钢股份有限公司 | Eliminate the method for decorating with generous stainless steel cold-rolled plate flatness defect |
| CN109332394B (en) * | 2018-09-30 | 2019-11-08 | 山西太钢不锈钢股份有限公司 | Eliminate the method that stainless steel wide cut cold plate rolls local heat slid wound defect |
| CN109226280B (en) * | 2018-10-23 | 2020-03-31 | 东北大学 | Method for controlling double-edge wave shape and medium-wave shape of five-stand cold continuous rolling high-strength steel plate strip |
| CN111438189B (en) * | 2020-04-09 | 2021-12-07 | 北京首钢股份有限公司 | Cold-rolled sheet and shape control method thereof |
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