CN112974530A - High-temperature-resistant high-resistance narrow-width ultrathin precise stainless steel foil rolling method - Google Patents
High-temperature-resistant high-resistance narrow-width ultrathin precise stainless steel foil rolling method Download PDFInfo
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- CN112974530A CN112974530A CN202110196092.5A CN202110196092A CN112974530A CN 112974530 A CN112974530 A CN 112974530A CN 202110196092 A CN202110196092 A CN 202110196092A CN 112974530 A CN112974530 A CN 112974530A
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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
- B21B1/40—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 foils which present special problems, e.g. because of thinness
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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
- B21B27/02—Shape or construction of rolls
Abstract
The invention provides a high-temperature-resistant high-resistance narrow-width ultrathin precise stainless steel foil rolling method, which adopts a twenty-high roll mill provided with a second intermediate roll with a selected convexity and a first intermediate roll with a selected taper to roll; the rolling method comprises the following steps: carrying out primary rolling on the raw material steel plate at a rolling speed of 150-160 m/min; and carrying out intermediate pass rolling and final pass rolling at a rolling speed of more than 200 m/min. The rolling method can effectively control the flatness of the stainless steel foil product, and has small thickness tolerance fluctuation and stable surface quality.
Description
Technical Field
The invention relates to the technical field of stainless steel foil rolling, in particular to a method for rolling a high-temperature-resistant high-resistance narrow-width ultrathin precise stainless steel foil.
Background
The high-temperature-resistant high-resistance ultrathin precise stainless steel foil is stainless steel strip with the thickness of less than 0.05mm, the thinnest thickness required by the product market at present reaches 0.03mm, and the high-temperature-resistant high-resistance ultrathin precise stainless steel foil is favored by high and top markets due to good mechanical properties and light and thin characteristics of the stainless steel foil. However, with the increasing requirements of customers on products, the requirements on the flatness of the ultrathin stainless steel strip are more precise and strict, and the ultrathin stainless steel strip is more widely applied in the market, and high-temperature-resistant high-resistance ultrathin precise stainless steel foil is expected to be utilized in various industries such as military industry, nuclear power, solar energy, electronic products and the like. The plate flatness of the high-temperature-resistant high-resistance ultrathin precise stainless steel foil produced by the existing method is unstable. Particularly, how to realize the stability of the flatness of the precision stainless steel foil product with the width of less than 500mm is a difficult problem which is difficult to solve.
In the rolling process of the high-temperature-resistant high-resistance ultrathin precise stainless steel foil, the stability of the high-temperature-resistant high-resistance ultrathin precise stainless steel foil can be ensured only by high-speed rolling due to the cold brittleness characteristic of the high-temperature-resistant high-resistance ultrathin precise stainless steel foil. When the rolling speed is too high, the hot crown due to the roll system is also increased, resulting in deterioration of the plate shape. In the rolling process, the rolling tension and pressure required by rolling are relatively large, the strip drawing and breaking problems easily occur in the rolling process, the edge extension is usually relatively small in the rolling process, the middle extension is relatively large in the rolling process, the strip drawing and breaking risks are avoided, but the plate flatness is sacrificed in the mode, and great influence is caused on the subsequent straightening and withdrawal process.
At present, no rolling method can effectively solve the problems.
Disclosure of Invention
In order to solve all or part of the problems, the invention provides a rolling method of a high-temperature-resistant high-resistance narrow-width ultrathin precise stainless steel foil.
The technical scheme of the invention is as follows:
a high temperature resistant high resistance narrow width ultra-thin precision stainless steel foil rolling method, adopt and equip with second intermediate roll of the selected convexity and select the first intermediate roll of the conicity twenty-high roll mill to roll; the rolling method comprises the following steps: carrying out primary rolling on the raw material steel plate at a rolling speed of 150-160 m/min; and carrying out intermediate pass rolling and final pass rolling at a rolling speed of more than 200 m/min.
Optionally, the working roll used in each pass of rolling is an M2 roll with the diameter difference of less than 5 μ M; preferably, the working rolls adopted in the first pass rolling and the intermediate pass rolling are M2 material rolls with the roughness Ra of 0.35-0.4 μ M and the diameter difference of the same roll less than 5 μ M; the working roll adopted by the last rolling is an M2 material roll with the roughness Ra of 0.2-0.25 mu M and the diameter difference of the same roll less than 5 mu M.
Optionally, the pass deformation of the first pass rolling is 28-30%; the pass deformation of the last pass rolling is 8-10%.
Optionally, in the rolling process, the flow of rolling oil is 800-1000L/min; preferably, the flow rate of rolling oil in the rolling process is 850-950L/min.
Optionally, the width of the raw steel plate is 450-500 mm.
Alternatively, among the 6 second intermediate rolls of the twenty-high rolling mill, 2 second intermediate rolls other than the 4 edge rolls have a crown of 30 passes.
Optionally, the 4 first intermediate rolls of the twenty high mill have a taper of 200 x 0.4 mm.
Optionally, the width of the raw steel plate is 400-450 mm.
Alternatively, among the 6 second intermediate rolls of the twenty-high rolling mill, 2 second intermediate rolls other than the 4 edge rolls have a crown of 50 passes.
Optionally, the 4 first intermediate rolls of the twenty high mill have a taper of 250 x 0.5 mm.
Compared with the prior art, the rolling method of the high-temperature-resistant high-resistance narrow-width ultrathin precise stainless steel foil has at least the following beneficial effects:
the flatness of the product is effectively controlled, the thickness tolerance is small in fluctuation, the surface quality is stable, the production bottleneck in the subsequent processing process is solved, the product quality is obviously improved, the method is suitable for industrial mass production, and the high-quality requirement of the high-end industry of the ultrathin precise stainless steel foil is met.
Drawings
Figure 1 shows the surface quality of rolled stainless steel foil according to example 1 of the present invention.
Figure 2 shows the surface quality of rolled stainless steel foil according to example 2 of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
In the rolling process of the ultra-thin precision stainless steel foil, on one hand, high-speed rolling is required to ensure the stability of the stainless steel foil due to the cold-brittle characteristic of the stainless steel foil, but the rolling speed is too high, the hot crown caused by a roll system is increased, and the plate shape is deteriorated. On the other hand, the rolling tension and pressure required by rolling are relatively large, so that the problems of strip drawing and strip breaking are easy to occur in the rolling process. In order to solve the problems, the edge part is relatively small in extension and the middle part is relatively large in extension in the rolling process, so that the risks of strip drawing and strip breakage are avoided, but the plate flatness is sacrificed in the mode, and the subsequent straightening and withdrawal process is greatly influenced.
Due to the contradiction among the product performance, the rolling process requirement and the plate type flatness control, no ultrathin precise stainless steel foil rolling method can ensure smooth rolling, ensure the quality of finished products and effectively control the flatness of the finished products.
In view of the above problems, the inventors of the present invention have conducted intensive studies on both equipment and rolling process for a narrow ultra-thin precision stainless steel foil having a width of not more than 500mm, thereby creatively providing a stainless steel foil rolling method. The ultrathin precise stainless steel foil obtained by the rolling method can be used for high-temperature-resistant and high-resistance applications. Specifically, by re-establishing a roller system configuration method, rolling process arrangement, and controlling the aspects of pass reduction, rolling tension, rolling oil quantity and the like, the problems in the production process are solved, the rolling plate shape problem is obviously improved, the production of the high-temperature-resistant high-resistance ultrathin precise stainless steel foil is stabilized, and the requirements of downstream production are met.
In one aspect, the present invention provides an improvement in a rolling mill. Currently, a common twenty-high rolling mill typically includes 8 support rolls, 6 second intermediate rolls (4 of which are edge rolls), 4 first intermediate rolls, and 2 work rolls. In the present invention, the work rolls of 15 crown and D2 material used in the past were adjusted to be flat rolls of M2 material (i.e., the difference in diameter between the rolls was less than 5 μ M). In addition, 2 second intermediate rolls except the edge rolls were replaced with 30-pass or 50-pass second intermediate rolls, and 4 first intermediate rolls were replaced with 200 × 0.4mm tapered or 250 × 0.5mm tapered first intermediate rolls, depending on the width of the raw steel sheet. The second intermediate roll and the first intermediate roll are the same as the original rolls in terms of material and the like except for convexity, taper and roughness. For example, in the following examples, the original X63 material was used for both the first intermediate roll and the second intermediate roll, except for crown, taper, and roughness, and the hardness remained at 58-60 HRC.
Wherein, the M2 material refers to molybdenum series high-speed steel, which has the advantages of uniform carbide, high toughness, high hardness, good wear resistance and the like, and the hardness can reach 62-65 HRC. The D2 material is an alloy tool steel with hardness less than 62 HRC. In the present invention, the work rolls of 15 crown and D2 material, which are commonly used, were adjusted to be flat rolls of M2 material. Because the M2 roller has higher hardness than the D2 roller, the elastic deformation is small in the rolling process, the rolling force is smaller in the rolling process, and the plate shape is relatively better. The hardness of the roller is improved, the surface of the rear roller is not easy to bond oxide generated in the rolling process, the roller sticking phenomenon can be effectively relieved, and the rolling is more stable.
The inventors of the present invention found, through intensive studies, that:
the rolling mill frame can be bent and deformed under the action of rolling pressure, so that the pressure of the edge of the steel plate is high, and the pressure of the middle of the steel plate is low. Therefore, the roller convexity needs to be supplemented in the roller system to compensate the bending deformation of the frame.
The convexity added on the working roll is the most direct method, the convexity added on the working roll directly acts on the steel plate, the convexity can be quickly adjusted according to the rolled plate shape, the forming speed of the roll system configuration scheme is high, and the process development cost is low. However, the convexity roller has high grinding difficulty, and the convexity precision control during grinding is relatively poor and can only reach 20 micrometers. For rolling of precise foils, the stability is poor, the plate shape is unstable, and accidents frequently occur in the production process.
The precision of the flat roll of the grinding working roll can reach within 5 mu m, the precision of the convex roll of the second intermediate roll can reach 3 mu m, and the stability of industrial production can be ensured. In the 6 second intermediate rolls, the convexity is increased on the two middle rolls, so that the stress stability of the roll system can be ensured, and the problem of rolling pressure deviation caused by the deformation of the frame can be solved. Only because the convexity effect of the second intermediate roll needs to be transmitted to the first intermediate roll and then to the working rolls, different elastic flattening amounts can appear on each roll under the action of rolling force, and the steel strip is not directly stressed, so that the intermediate rolls need larger convexity. Through repeated research, the inventor finally determines that the first intermediate roll, the second intermediate roll and the working rolls of the twenty-high rolling mill are improved, so that the rolling stability of the rolling mill is remarkably improved, and the production cost is greatly reduced.
In addition, it should be noted that the twenty-high rolling mill used in the following embodiments is a SUNDWIG four-stand twenty-high rolling mill, but this is merely exemplary, and the method of the present invention is applicable to any type of twenty-high rolling mill.
On the other hand, the invention also improves the rolling process. Specifically, the rolling method of the present invention includes:
s1: the plate shape of the raw steel plate is adjusted according to the cold brittleness. This is a conventional process in the art, and those skilled in the art can perform the operation according to the actual situation, which is not described herein.
S2: carrying out first pass rolling at the rolling speed of 150-160m/min and the pass deformation of 28-30%. Because the high-temperature-resistant high-resistance material has obvious cold brittleness and the rolling speed is as fast as possible, the first-pass rolling speed needs to be controlled within 150-160m/min in order to prevent abnormal conditions caused by the defect that the first-pass incoming material is unknown.
S3: carrying out middle pass rolling at the rolling speed of more than or equal to 200 m/min. When the intermediate rolling is performed, one-pass rolling, two-pass rolling, or three-pass rolling may be performed. The pass deformation of each pass can be reasonably selected by a person skilled in the art based on actual needs, and is not described herein in detail.
S4: and carrying out the last rolling pass at the rolling speed of more than or equal to 200m/min, wherein the pass deformation is 8-10%.
Because the high-temperature-resistant high-resistance material has obvious cold brittleness, the flow of rolling oil is controlled to be 800-1000L/min in the rolling process; preferably, the flow rate of the rolling oil is controlled to be 850-950L/min.
The rolling method of the present invention can be applied to any type of raw steel sheet, and is particularly suitable for high-chromium high-aluminum stainless steel, such as 0Cr21Al6, 1Cr13Al4, and the like.
In the rolling method of the invention, the first pass uses smaller rolling tension, which can ensure the edge shrinkage problem of the steel strip when the steel strip is not work hardened. Along with the work hardening of the steel strip, the rolling tension is increased in the second pass, and rib stripes in the subsequent passes are prevented. However, the rolling tension is too large, so that the strip breakage rate is increased; rib stripes can appear when the tension is too low, and the problem of belt drawing is easy to appear. Therefore, the pass tension is optimized, and the tension setting range is narrowed. In the rolling process, the rolling tension must be finely adjusted according to the rolling condition due to uncontrollable factors such as the difference between the supplied materials and the plate.
In the rolling method, the rolling oil has the functions of cooling and lubricating, and the roller system needs enough lubrication during the rolling process to roll normally. However, such stainless steel is liable to cold embrittlement, and the steel coil temperature must be controlled to 50 degrees or more during rolling. Therefore, the rolling oil flow needs to be controlled, and the limitation of the rolling speed is made.
The rolling method can adopt a raw material steel plate with the thickness of 0.1-0.05 mm (such as 0.08mm) to prepare a narrow ultrathin precise stainless steel foil with the thickness of not more than 0.05mm and the width of not more than 500mm, and realizes that the plate flatness of the stainless steel foil is less than 6 IU.
The invention provides a rolling method for rolling high-temperature-resistant high-resistance narrow-width ultrathin precise stainless steel foil with the width of 450-500 mm (namely, the width is more than or equal to 450mm and less than or equal to 500 mm). The convexity of the second intermediate roll except the edge roll of the twenty-high rolling mill adopted by the rolling method is 30, and the conicity of 4 first intermediate rolls is 200 multiplied by 0.4 mm. The rolling method specifically comprises the following steps:
s101: the plate shape of the raw steel plate is adjusted according to the cold brittleness.
S102: the first pass rolling is carried out by taking an M2 material roller with the roughness Ra of 0.25-0.35 mu M and the diameter difference of the same roller less than 5 mu M as a working roller, the rolling speed is 150-160M/min, and the pass deformation is 28-30%.
S103: the M2 material roller with the roughness Ra of 0.25-0.35 mu M and the diameter difference of the same roller of less than 5 mu M is used as a working roller to carry out intermediate pass rolling, and the rolling speed is more than or equal to 200M/min. When the intermediate rolling is performed, one-pass rolling, two-pass rolling, or three-pass rolling may be performed. The pass deformation of each pass can be reasonably selected by a person skilled in the art based on actual needs, and is not described herein in detail.
S104: and (3) performing final rolling by using an M2 material roller with the roughness Ra of 0.2-0.25 mu M and the diameter difference of the same roller less than 5 mu M as a working roller, wherein the rolling speed is more than or equal to 200M/min, and the pass deformation is 8-10%.
As another preferred embodiment, the invention provides a rolling method for rolling the high-temperature-resistant high-resistance narrow-width ultrathin precise stainless steel foil with the width of 400-450 mm (namely, the width is more than or equal to 400mm and less than 450 mm). The convexity of the second intermediate roll except the edge roll of the twenty-high rolling mill adopted by the rolling method is 50, and the conicity of 4 first intermediate rolls is 250 multiplied by 0.5 mm. The rolling method specifically comprises the following steps:
s201: the plate shape of the raw steel plate is adjusted according to the cold brittleness.
S202: the first pass rolling is carried out by taking an M2 material roller with the roughness Ra of 0.25-0.35 mu M and the diameter difference of the same roller less than 5 mu M as a working roller, the rolling speed is 150-160M/min, and the pass deformation is 28-30%.
S203: the M2 material roller with the roughness Ra of 0.25-0.35 mu M and the diameter difference of the same roller of less than 5 mu M is used as a working roller to carry out intermediate pass rolling, and the rolling speed is more than or equal to 200M/min. When the intermediate rolling is performed, one-pass rolling, two-pass rolling, or three-pass rolling may be performed. The pass deformation of each pass can be reasonably selected by a person skilled in the art based on actual needs, and is not described herein in detail.
S204: and (3) performing final rolling by using an M2 material roller with the roughness Ra of 0.2-0.25 mu M and the diameter difference of the same roller less than 5 mu M as a working roller, wherein the rolling speed is more than or equal to 200M/min, and the pass deformation is 8-10%.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example 1
The target finished product is high-temperature-resistant high-resistance narrow-width ultrathin stainless steel, the width of the stainless steel is 500mm, the steel grade is 0Cr21Al6 (unified national standard mark), the thickness of the stainless steel is 0.03mm, and the surface roughness Ra of the stainless steel is 0.2-0.25 mu m.
The rolling scheme is as follows: and selecting 0Cr21Al6 steel grade ultrathin stainless steel with the thickness of 0.08mm and the width of 500mm for rolling.
Two middle rolls with the convexity of 30 and one middle roll with the taper of 200 multiplied by 0.4mm are selected and assembled to a SUNDWIG four-upright twenty-high roll mill.
The rolling schedule is edited according to the production process as follows:
the rolling deformation and tension of each pass are set according to a rolling table.
The rolling oil flow rate was adjusted to 960L/min.
The process of this example is as follows:
the first rolling, selecting an M2 material roller with the roughness Ra of 0.35-0.4 μ M and the diameter difference of the same roller less than 5 μ M, starting to adjust the plate shape stably, and then increasing the rolling speed to 150-160M/min;
selecting an M2 material roller with the roughness Ra of 0.35-0.4 mu M and the diameter difference of the same roller of less than 5 mu M for rolling from the second pass to the fourth pass, starting to adjust the plate shape stably, and then increasing the rolling speed to more than 200M/min;
selecting an M2 material roller with the roughness Ra of 0.2-0.25 mu M and the diameter difference of the same roller less than 5 mu M for the fifth pass rolling, starting to adjust the plate shape stably, and then increasing the rolling speed to more than 200M/min;
the main technical indexes of the product produced by the process can reach as follows:
thickness deviation: 0.03 +/-0.001 mm;
flatness: 6 UI;
surface roughness Ra: 0.2-0.25 μm;
surface quality: the surface is uniform and consistent, the defects of chromatic aberration, spiral lines, sand drop marks and the like are avoided, and the glossiness in each direction is uniform, and is shown in figure 1.
Example 2
The target finished product is high-temperature-resistant high-resistance narrow-width ultrathin stainless steel, the width of the stainless steel is 400mm, the steel grade is 0Cr21Al4 (unified national standard mark), the thickness of the stainless steel is 0.03mm, and the surface roughness Ra of the stainless steel is 0.2-0.25 mu m.
The rolling scheme is as follows: and selecting 0Cr21Al4 steel grade ultrathin stainless steel with the thickness of 0.08mm and the width of 400mm for rolling.
Two middle rolls with the convexity of 50 and one middle roll with the taper of 250 multiplied by 0.5mm are selected and assembled to a SUNDWIG four-upright twenty-high roll mill.
The rolling schedule is edited according to the production process as follows:
the rolling deformation and tension of each pass are set according to a rolling table.
The rolling oil flow rate was adjusted to 910L/min.
The process of this example is as follows:
the first rolling, selecting an M2 material roller with the roughness Ra of 0.35-0.4 μ M and the diameter difference of the same roller less than 5 μ M, starting to adjust the plate shape stably, and then increasing the rolling speed to 150-160M/min;
selecting an M2 material roller with the roughness Ra of 0.35-0.4 mu M and the diameter difference of the same roller of less than 5 mu M for rolling from the second pass to the fourth pass, starting to adjust the plate shape stably, and then increasing the rolling speed to more than 200M/min;
selecting an M2 material roller with the roughness Ra of 0.2-0.25 mu M and the diameter difference of the same roller less than 5 mu M for the fifth pass rolling, starting to adjust the plate shape stably, and then increasing the rolling speed to 200M/min;
the main technical indexes of the product produced by the process can reach as follows:
thickness deviation: 0.03 +/-0.001 mm;
flatness: 6 UI;
surface roughness Ra: 0.2-0.25 μm;
surface quality: the surface is uniform and consistent, the defects of chromatic aberration, spiral lines, sand drop marks and the like are avoided, and the glossiness in each direction is uniform, as shown in figure 2.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the protection scope of the present invention.
Claims (10)
1. A rolling method of high temperature resistant high resistance narrow width ultrathin precise stainless steel foil is characterized in that a twenty-high roll mill provided with a second middle roll with selected convexity and a first middle roll with selected taper is adopted for rolling; the rolling method comprises the following steps:
carrying out primary rolling on the raw material steel plate at a rolling speed of 150-160 m/min;
and carrying out intermediate pass rolling and final pass rolling at a rolling speed of more than 200 m/min.
2. The method of rolling stainless steel foil according to claim 1, wherein the work rolls used in each rolling pass are M2 rolls having a diameter difference of less than 5 μ M;
preferably, the working rolls adopted in the first pass rolling and the intermediate pass rolling are M2 material rolls with the roughness Ra of 0.35-0.4 μ M and the diameter difference of the same roll less than 5 μ M; the working roll adopted by the last rolling is an M2 material roll with the roughness Ra of 0.2-0.25 mu M and the diameter difference of the same roll less than 5 mu M.
3. The rolling method according to claim 1, wherein the pass deformation of the first pass rolling is 28% to 30%; the pass deformation of the last pass rolling is 8-10%.
4. The rolling method according to claim 1, wherein the flow rate of rolling oil during rolling is 800 to 1000L/min; preferably, the flow rate of rolling oil in the rolling process is 850-950L/min.
5. The rolling method according to any one of claims 1 to 4, wherein the width of the raw steel sheet is 450 to 500 mm.
6. The rolling method according to claim 5, wherein the crown of 2 second intermediate rolls other than the 4 edge rolls among the 6 second intermediate rolls of the twenty-high rolling mill is 30 passes.
7. A rolling process according to claim 5, characterized in that the conicity of the 4 first intermediate rolls of the twenty-high rolling mill is 200 x 0.4 mm.
8. The rolling method according to any one of claims 1 to 4, wherein the width of the raw steel sheet is 400 to 450 mm.
9. The rolling method according to claim 8, wherein the crown of 2 second intermediate rolls other than the 4 edge rolls among the 6 second intermediate rolls of the twenty-high rolling mill is 50 passes.
10. The rolling process according to claim 8, characterized in that the conicity of the 4 first intermediate rolls of the twenty-high rolling mill is 250 x 0.5 mm.
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| CN114210732A (en) * | 2022-02-21 | 2022-03-22 | 山西太钢不锈钢精密带钢有限公司 | Precision control method for ultra-flat ultra-thin precise strip steel roller system of backlight plate |
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