CN115945526A - Shape control method for martensitic stainless steel - Google Patents
Shape control method for martensitic stainless steel Download PDFInfo
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- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 61
- 238000005096 rolling process Methods 0.000 claims abstract description 93
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 85
- 239000010959 steel Substances 0.000 claims abstract description 85
- 238000012937 correction Methods 0.000 claims description 47
- 238000004804 winding Methods 0.000 claims description 40
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000007730 finishing process Methods 0.000 abstract description 2
- 238000005097 cold rolling Methods 0.000 description 36
- 238000004519 manufacturing process Methods 0.000 description 22
- 229910001220 stainless steel Inorganic materials 0.000 description 14
- 239000010935 stainless steel Substances 0.000 description 13
- 238000013000 roll bending Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 9
- 230000002146 bilateral effect Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 229910000734 martensite Inorganic materials 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of metallurgical steel rolling in metallurgical science and technology, and particularly relates to a method for controlling the shape of a martensitic stainless steel plate, which comprises the following steps: increasing the target convexity of a finishing mill group in a finishing process according to the thickness of the steel plate; the coiling tension is improved according to the principle that the smaller the thickness of the steel plate is, the larger the coiling tension is; reducing the tension between the finishing mill stands. The method for controlling the shape of the martensitic stainless steel successfully solves the problem of serious edge waves of the martensitic stainless steel, the shape of the martensitic stainless steel reaches a normal control level in the next working procedure rolling process, obvious double-edge wave or single-edge wave plate shapes do not exist, the martensitic stainless steel is directly cold rolled without being over-flattened, the shape quality is greatly improved, and the economic benefit is obvious.
Description
Technical Field
The invention belongs to the technical field of metallurgical steel rolling in metallurgical science and technology, and particularly relates to a method for controlling the shape of a martensitic stainless steel plate.
Background
The layout of the equipment of the Taigang steel 1549 hot continuous rolling production line is shown in figure 1 and is divided into a furnace area, a rough rolling area, a finish rolling area and a coiling area. The main production process of the hot continuous rolling production line is that a plate blank is firstly heated in a heating furnace according to the temperature specified by the process, and is firstly put into a roughing mill for rolling after being heated to the target temperature, wherein the roughing vertical roll controls the width, the flat roll controls the thickness, and reversible rolling is carried out in a roughing mill group, and the number of passes is generally 5-7. And rolling by a roughing mill group to enable the strip steel to reach preset target thickness, width and temperature. And then the strip steel enters a finishing mill group to carry out seven-frame flat roll continuous rolling so as to enable the strip steel to reach the preset target thickness and temperature. And then the strip steel is controlled by laminar cooling to reach the target coiling temperature. And finally, forming the strip steel into a steel coil through a coiling machine.
The martensitic stainless steel is a stainless steel grade with characteristics, has the characteristics of high strength, high hardness, corrosion resistance and the like, and is widely applied to the fields of steam turbines, medical instruments, cutters and the like.
The production process of the martensitic stainless steel comprises four procedures of iron making, steel making, hot rolling and cold rolling, and the detailed production flow of the martensitic stainless steel is shown in figure 2 from a hot continuous rolling line.
In the martensite production process, compared with other steel grades, the martensite plate shape problem is the most prominent, the martensite plate shape is normally controlled in the hot continuous rolling process, the flatness detection and the observed plate shape are also normal, but an obvious rule is that: after the strip steel is cooled, when the strip steel is rolled in a cold rolling process, very serious edge waves (as shown in figures 3A and 3B) appear in each coil, the double edge waves are mainly used, single edge waves are mixed in the middle of the strip steel, the wave height is over 80mm generally, and is over 200mm in serious condition, so that faults such as cold rolling speed reduction, strip breakage and the like frequently occur.
In order to solve the problem of severe edge waves after the martensitic stainless steel is cooled, particularly the problem of ubiquitous double edge waves, the hot rolling adopts conventional plate shape improvement methods such as target middle wave rolling, timely adjustment of single edge waves and the like, but the plate shape of the cold rolling process is tracked, and the substantial improvement is basically not realized. In order to ensure the normal rolling of cold rolling, the following hot rolling improvement measures are forced to be adopted: after annealing of the martensitic stainless steel in the bell type furnace, the martensitic stainless steel can be circulated to a cold rolling process for rolling after the shape of the martensitic stainless steel is flattened by a flattening process. However, after the working procedures are increased, the production cost of the martensitic stainless steel is greatly increased, and the flat delivery time of other thin-specification products is influenced.
Disclosure of Invention
The invention mainly aims to solve the problems that the hot rolled shape of martensitic stainless steel is normal and the cold rolled shape has serious edge waves after cooling, and provides a shape control method for the martensitic stainless steel for eliminating the influence of internal stress after cooling.
Specifically, the method for controlling the plate shape of the martensitic stainless steel of the invention comprises the following steps:
increasing the target convexity of a finishing mill group in a finishing process according to the thickness of the steel plate;
the coiling tension is improved according to the principle that the smaller the thickness of the steel plate is, the larger the coiling tension is;
reducing the tension between the finishing mill stands.
In the above method for controlling the shape of the martensitic stainless steel, the target crown is calculated as follows:
C40_new＝C40×coff_p
wherein C40_ new is the target convexity, μm;
c40 is original target convexity in mum;
coff _ p is a convexity correction coefficient.
In the above method for controlling the shape of the martensitic stainless steel, the convexity correction coefficient has the following value range:
| thickness of steel plate (mm) | Convexity correction coefficient coff _ p |
| [5.0,+∞) | 1.1～1.3 |
| [4.0,5.0) | 1.3～1.5 |
| [3.0,4.0) | 1.5～1.7 |
| (-∞,3.0) | 1.7～2.1 |
。
In the above method for controlling the shape of the martensitic stainless steel, the range of the original target convexity is as follows:
| thickness of steel plate (mm) | Original target convexity C40 (mum) |
| [5.0,+∞) | 45 |
| [4.0,5.0) | 35 |
| [3.0,4.0) | 30 |
| (-∞,3.0) | 25 |
。
In the above method for controlling the sheet shape of the martensitic stainless steel, the winding tension is calculated as follows:
cten_new＝cten×coff_c
wherein cten _ new is winding tension, N/mm 2 ；
cten is the original winding tension, N/mm 2 ；
coff _ c is a winding tension correction coefficient.
In the above method for controlling the sheet shape of the martensitic stainless steel, the value range of the coiling tension correction coefficient is as follows:
| thickness of steel plate (mm) | Winding tension correction coefficient coff _ c |
| [5.0,+∞) | 1.30～1.32 |
| [3.5,5.0) | 1.32～1.38 |
| (-∞,3.5) | 1.38～1.40 |
。
In the above method for controlling the shape of the martensitic stainless steel, the original coiling tension has the following value range:
in the plate shape control method for the martensitic stainless steel, the finish rolling process adopts 7 stands to roll the martensitic stainless steel plate.
In the method for controlling the shape of the martensitic stainless steel, the tension between the frames in the finish rolling process takes the following values:
the technical scheme of the invention has the following beneficial effects:
the method for controlling the shape of the martensitic stainless steel successfully solves the problem of serious edge waves of the martensitic stainless steel, the shape of the martensitic stainless steel reaches a normal control level in the next working procedure rolling process, obvious double-edge wave or single-edge wave plate shapes do not exist, the martensitic stainless steel is directly cold rolled without being over-flattened, the shape quality is greatly improved, and the economic benefit is obvious.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic view of a Tai-steel 1549 hot continuous rolling line;
FIG. 2 is a schematic view of a detailed production flow of a martensitic stainless steel;
FIGS. 3A and 3B are photographs of a cold rolled sheet of martensitic stainless steel before the practice of the invention;
FIGS. 4A and 4B are photographs of a cold rolled sheet of martensitic stainless steel after the practice of the invention;
description of the symbols: 1 is a heating furnace (4 seats); 2 is a high-pressure water descaling box; 3 is a rough rolling vertical roller mill (VE 0); 4 is a rough rolling flat roller mill (R0); 5 is a heat preservation cover; 6, drum type crop flying shears; 7 are finish rolling machine frames (7 additional frames); 8 is a convexity meter; 9 is a width gauge; 10 is a thickness gauge; 11 is a flatness meter; 12, laminar cooling; and 13 is a coiling machine.
Detailed Description
The invention will be described in detail with reference to the following detailed description for fully understanding 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.
When a range of values is disclosed herein, the range is considered to be continuous and includes both the minimum and maximum values of the range, as well as each value between such minimum and maximum values. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.
The general technical scheme of the invention is to adopt a plate shape control method for controlling the large convexity of a finishing mill group, the large tension between coiling and finishing rolling and the small tension of a finishing mill frame, thereby solving the problem of serious double-side waves caused by internal stress of martensitic stainless steel in a cold rolling process. Through continuously debugging parameters in actual production, the optimal plate shape effect is finally achieved, the martensitic stainless steel is directly subjected to cold rolling without being too flat, the plate shape quality is greatly improved, and the economic benefit is remarkable.
The control system of the hot continuous rolling adopts two-stage computer control, namely process control computer (L2 computer) control and basic automation computer (L1) control, the control parameter that the technology of the invention involves mainly includes convexity, coiling tension, finish rolling tension, its control process is as follows:
s1, determining parameters such as target convexity, coiling tension, tension between finishing mill frames and the like in an L2 level computer;
s2, sending the calculation result of the L2 level computer to an SDH module (a set proxy module) of the L1 level computer in a message mode;
s3, establishing a communication channel from the SDH to the L1 related control module;
and S4, reading the message data value, transmitting the message data value to a control block of the transmission system, and executing and controlling specific parameters.
The invention mainly aims at three parameters of target convexity (namely target convexity of a finished product), tension between coiling and finish rolling (coiling tension for short) and tension between finishing mill frames (finish rolling tension for short) of a finishing mill group to adjust, thereby improving or offsetting internal stress after cooling and improving plate shape after cooling.
Before the implementation of the invention, the original target convexity, the original coiling tension and the original tension between the frames of the finishing mill of the martensitic stainless steel are determined according to the following methods:
convexity of original target
The original target convexity of the martensitic stainless steel was determined from the thickness, as shown in table 1.
TABLE 1 original target convexity of martensitic stainless steel
| Thickness of steel plate (mm) | Original target convexity C40 (mum) |
| [5.0,+∞) | 45 |
| [4.0,5.0) | 35 |
| [3.0,4.0) | 30 |
| (-∞,3.0) | 25 |
It should be noted that the expression "[ a, b)" appearing in table 1 and the following tables means a ≦ thickness < b; "[ c, + ∞)" indicates that c is less than or equal to the thickness; "(∞, d)" thickness < d.
The convexity refers to C40 convexity, and the specific meaning is as follows:
c40 convexity = the thickness of the central line of the strip steel-the average thickness of the two sides 40mm away from the side parts.
The seven-rack rollers of the finish rolling of the Taigang 1549 production line are flat rollers with original concavity, and are mainly guaranteed by the bending force of the seven racks in the rolling process in order to achieve the target convexity.
Original coiling tension
The coiling tension refers to coiling unit tension (all coiling tensions refer to coiling unit tension throughout the text), namely the coiling tension on a unit area of the cross section of the strip, and is expressed by cten. cten is determined according to steel type and thickness, and is shown in table 2.
TABLE 2 raw coiling tension of martensitic stainless steel
Tension between frames of primary finishing mill
The tension between the stands of the finishing mill refers to the unit tension between the stands (the tension between the stands refers to the unit tension between the stands throughout), that is, the tension of the strip steel on the unit area of the cross section between the stands, and ten (i) (i represents the stand number, such as F0 to F1 stands, i is 0, and then 1, 2, 3, 4, 5) is determined according to the steel type and the thickness, as shown in Table 3.
TABLE 3 original tension between the stands of the finishing mill
The invention mainly aims at solving the problem of severe edge waves of martensitic stainless steel in the cold rolling process, and provides a hot rolled plate shape control method.
Target convexity
The target convexity is increased to different extents at different thicknesses. The determination is carried out according to the following method: namely, on the basis of the original determined target convexity, a convexity correction coefficient of the martensitic stainless steel is added, as shown in the following formula.
C40_new＝C40×coff_p (1)
Wherein C40_ new is the target convexity, μm;
c40 is the original target convexity in mum;
coff _ p is a convexity correction coefficient.
The crown correction factor is related to the thickness of the steel sheet, and is performed as shown in table 4.
TABLE 4 coefficient of crown correction coff _ p for martensitic stainless steels
| Thickness of steel plate (mm) | Convexity correction coefficient coff _ p |
| [5.0,+∞) | 1.1～1.3 |
| [4.0,5.0) | 1.3～1.5 |
| [3.0,4.0) | 1.5～1.7 |
| (-∞,3.0) | 1.7～2.1 |
It should be noted that the expression "a to b" appearing in all tables of this patent means "a < index. Ltoreq.b", and "1.1 to 1.3" in table 4 means "1.1< convexity correction coefficient. Ltoreq.1.3".
Coiling tension
The technical idea for specifically determining the coiling tension is as follows: the coiling tension is as large as possible, but the coiling overcurrent phenomenon, namely the phenomenon of overlarge coiling current, cannot be caused, so that the generation of scrap steel is avoided. Meanwhile, the phenomenon of double-edge wave generated by cold rolling is combined, namely the thinner the strip steel is, the more serious the double-edge wave is. Therefore, when the winding tension is determined, the thinner the thickness, the larger the winding tension.
The method for specifically determining the coiling tension comprises the following steps: on the basis of originally determining the coiling tension, a martensitic stainless steel coiling tension correction coefficient is added, as shown in the following formula.
cten_new＝cten×coff_c (2)
Wherein cten _ new is the winding tension, N/mm 2 ；
cten is the original winding tension, N/mm 2 ；
coff _ c is a winding tension correction coefficient.
The winding tension correction coefficient is related to the thickness of the steel sheet, and is specifically performed as shown in table 5.
TABLE 5 Martensitic stainless Steel coiling tension correction coefficient coff _ c
| Thickness of steel plate (mm) | Winding tension correction coefficient coff _ c |
| [5.0,+∞) | 1.30～1.32 |
| [3.5,5.0) | 1.32～1.38 |
| (-∞,3.5) | 1.38～1.40 |
Tension between finishing mill stands
Before the method is implemented, the tension between the frames of the finishing mill is controlled according to the idea of large tension, but the actual double-side waves or single-side wave plates between the frames can be covered by the excessive tension, so that the strip steel is difficult to observe when the edge waves occur between the frames, and particularly the strip steel cannot be timely adjusted in operation aiming at the single-side wave plates, thereby forming the hidden edge wave plates. However, if the tension between the frames is too low, a virtual bushing phenomenon may occur between the frames, thereby causing scrap steel. The final determined tension between the finishing mill stands after constant adjustment and verification is shown in table 6.
Table 6 tension between finishing mill stands of the present invention
Compared with the prior art, the method for controlling the shape of the martensitic stainless steel successfully solves the problem of serious edge waves, particularly double edge waves, after the martensitic stainless steel is cooled, the edge wave height in the cold rolling process is reduced from more than 80mm to less than 15mm, no obvious double edge waves or single edge wave plates exist, the martensitic stainless steel is directly cold rolled without being over-flat, and the economic benefit is obvious. The improved martensitic stainless steel cold rolling process plate shape is shown in fig. 4A and 4B.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the invention thereto. Experimental procedures without specifying specific conditions in the following examples were carried out according to conventional methods and conditions.
Example 1:
in this example, 1CR13 stainless steel is rolled, and the coil number: 92A760001, steel grade: 12CR13; the thickness of the blank is 200mm, the width of the blank is 1240mm, and the thickness of the rough rolling target is 35mm; the target thickness of the finished strip steel is 6.00mm, and the target width is 1255mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 45 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.2.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝45×1.2＝54(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames from F0 to F6 in finish rolling are respectively as follows: 1305. 953, 890, 457, 315, 211, 125. After the rolling is finished, the actual convexity of the steel block is 56.5 mu m.
2. The coiling tension is determined.
According to Table 2, the unit tension of the log is 14.0N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.31.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝14.0×1.31＝18.34(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:3.5; f1 to F2:5.5; f2 to F3:7.5; f3 to F4:10.5; f4 to F5:13.5; f5 to F6:15.5.
and the plate shape of the coil in the cold rolling process is tracked under the control of the parameters, no edge wave basically occurs in the whole length, and the cold rolling production requirement is met.
Example 2:
in this example, 1CR13 stainless steel is rolled, and the coil number: 92A760101, steel grade: 12CR13; the thickness of the blank is 200mm, the width of the blank is 1220mm, and the thickness of the rough rolling target is 35mm; the target thickness of the finished strip steel is 4.60mm, and the target width is 1225mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 35 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.38.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝35×1.38＝48.3(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames from F0 to F6 in finish rolling are respectively as follows: 1536. 1011, 960, 516, 497, 302, 157. After the rolling is finished, the actual convexity of the steel block is 48.9 μm.
2. The coiling tension is determined.
According to Table 2, the unit tension of the log is 16.0N/mm 2 。
According to table 5, the winding tension correction coefficient coff _ c was 1.34.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝16.0×1.34＝21.44(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:4.3; f1 to F2:6.2; f2 to F3:8.4 of the total weight of the mixture; f3 to F4:11.9 of the total weight of the alloy; f4 to F5:14.4 of the total weight of the mixture; f5 to F6:16.4.
and the plate shape of the coil in the cold rolling process is tracked under the control of the parameters, no edge wave basically occurs in the whole length, and the cold rolling production requirement is met.
Example 3:
in this example, 1CR13 stainless steel is rolled, and the coil number: 92A760302, steel grade: 12CR13; the thickness of the blank is 200mm, the width of the blank is 1220mm, and the thickness of a rough rolling target is 35mm; the target thickness of the finished strip steel product is 3.50mm, and the target width is 1225mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 30 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.6.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝30×1.6＝48(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames from F0 to F6 in finish rolling are respectively as follows: 1536. 1011, 960, 516, 497, 302, 157. After the rolling is finished, the actual convexity of the steel block is 48.9 mu m.
2. The coiling tension is determined.
According to Table 2, the unit tension of the log is 16.0N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.38.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝16.0×1.38＝22.08(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:6.0; f1 to F2:7.0 of the total weight of the mixture; f2 to F3:10.0; f3 to F4:14.0; f4 to F5:16.0; f5 to F6:19.0.
and (3) tracking the plate shape of the cold rolling procedure of the coil according to the control of the parameters, wherein the full-length plate shape is normal, and the maximum bilateral wave height is 9mm, thereby meeting the requirements of cold rolling production.
Example 4:
in this example, 1CR13 stainless steel is rolled, and the coil number: 92A760405, steel grade: 12CR13; the thickness of the blank is 200mm, the width of the blank is 1150mm, and the thickness of the rough rolling target is 35mm; the target thickness of the finished strip steel product is 2.95mm, and the target width is 1175mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 25 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.9.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝25×1.8＝45(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames from F0 to F6 in finish rolling are respectively as follows: 550. 723, 300, 211, 105, 97, -56. After the rolling is finished, the actual convexity of the steel block is 46.1 μm.
2. And determining the coiling tension.
According to Table 2, the unit tension of the log is 18.0N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.39.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝18.0×1.39＝25.02(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:7.0 of the total weight of the mixture; f1 to F2:7.5; f2 to F3:10.5; f3 to F4:14.5; f4 to F5:16.5; f5 to F6:19.7.
and (3) tracking the plate shape of the cold rolling procedure of the coil according to the control of the parameters, wherein the full-length plate shape is normal, and the maximum bilateral wave height is 8mm, thereby meeting the requirements of cold rolling production.
Example 5:
in this example, 2CR13 stainless steel is rolled, and the coil number: 92A769801, steel grade: 20CR13; the thickness of the blank is 200mm, the width of the blank is 1240mm, and the thickness of the rough rolling target is 35mm; the target thickness of the finished strip steel is 5.00mm, and the target width is 1255mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 45 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.3.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝45×1.3＝58.5(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames from F0 to F6 in finish rolling are respectively as follows: -134, -53, -93, -48, -122, -214, -101. After the rolling is finished, the actual convexity of the steel block is 57.3 mu m
2. The coiling tension is determined.
According to Table 2, the unit tension of the log is 15.0N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.32.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝15.0×1.32＝19.8(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:4.0; f1 to F2:6.0; f2 to F3:8.0; f3 to F4:11.0; f4 to F5:14.0; f5 to F6:16.0.
and the plate shape of the coil in the cold rolling process is tracked under the control of the parameters, no edge wave is generated in the whole length, and the cold rolling production requirement is met.
Example 6:
in this example, 2CR13 stainless steel is rolled, and the coil number: 92A769802, steel grade: 20CR13; the thickness of the blank is 200mm, the width of the blank is 1090mm, and the thickness of a rough rolling target is 35mm; the target thickness of the finished strip steel is 4.50mm, and the target width is 1115mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 35 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.4.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝35×1.4＝49(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames from F0 to F6 in finish rolling are respectively as follows: 1055. 1134, 869, 511, 302, 95, 50. After the rolling is finished, the actual convexity of the steel block is 48.2 mu m.
2. The coiling tension is determined.
According to Table 2, the unit tension of the log is 17.5N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.34.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝17.5×1.34＝23.45(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:4.5; f1 to F2:6.2; f2 to F3:8.5; f3 to F4:12.0 of the total weight of the mixture; f4 to F5:14.5; f5 to F6:16.5.
and the plate shape of the coil in the cold rolling process is tracked under the control of the parameters, no edge wave is generated in the whole length, and the cold rolling production requirement is met.
Example 7:
in this example, 2CR13 stainless steel was rolled, and the coil number: 92A769901, steel grade: 20CR13; the thickness of the blank is 200mm, the width of the blank is 1090mm, and the thickness of the rough rolling target is 35mm; the target thickness of the finished strip steel is 3.50mm, and the target width is 1105mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 30 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.6.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝30×1.6＝48(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames from F0 to F6 in finish rolling are respectively as follows: 521. 101, 65, -51, -203, -300, -307. After the rolling is finished, the actual convexity of the steel block is 49.3 mu m.
2. And determining the coiling tension.
According to Table 2, the unit tension of the log is 17.5N/mm 2 。
According to table 5, the winding tension correction coefficient coff _ c was 1.38.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝17.5×1.38＝24.15(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:6.0; f1 to F2:7.0 of the total weight of the mixture; f2 to F3:10.0; f3 to F4:14.0 of the total weight of the mixture; f4 to F5:16.0; f5 to F6:19.0.
and tracking the plate shape of the coil in the cold rolling process according to the control of the parameters, wherein the full-length plate shape is normal, and the maximum bilateral wave height is 7mm, so that the cold rolling production requirement is met.
Example 8:
in this example, 2CR13 stainless steel is rolled, and the coil number: 92A767103, steel grade: 20CR13; the thickness of the blank is 200mm, the width of the blank is 1070mm, and the thickness of a rough rolling target is 35mm; the target thickness of the finished strip steel product is 2.93mm, and the target width is 1095mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 25 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.9.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝25×1.9＝47.5(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of all the frames in finish rolling are respectively as follows: 103, -205, 326, 207, 237, 102, -258. After the rolling is finished, the actual convexity of the steel block is 48.5 mu m.
2. The coiling tension is determined.
According to Table 2, the unit tension of the log is 19.0N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.39.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝19.0×1.39＝26.41(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:7.0; f1 to F2:7.5; f2 to F3:10.5; f3 to F4:14.5; f4 to F5:16.5; f5 to F6:19.7.
and (3) tracking the plate shape of the cold rolling procedure of the coil according to the control of the parameters, wherein the full-length plate shape is normal, and the maximum bilateral wave height is 9mm, thereby meeting the requirements of cold rolling production.
Example 9:
in this example, 3CR13 stainless steel is rolled, and the coil number: 92A692801, steel grade: 30CR13; the thickness of the blank is 200mm, the width of the blank is 1240mm, and the thickness of the rough rolling target is 35mm; the target thickness of the finished strip steel is 5.00mm, and the target width is 1255mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 45 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.3.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝45×1.3＝58(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames from F0 to F6 in finish rolling are respectively as follows: 1026. 556, 238, 305, 135, 221, -106. After the rolling is finished, the actual convexity of the steel block is 59.7 mu m
2. The coiling tension is determined.
According to Table 2, the unit tension of the log is 16.0N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.32.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝16.0×1.32＝21.12(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:4.0; f1 to F2:6.0; f2 to F3:8.0; f3 to F4:12.0 of the total weight of the mixture; f4 to F5:14.0; f5 to F6:16.5.
and the plate shape of the coil in the cold rolling process is tracked under the control of the parameters, no edge wave is generated in the whole length, and the cold rolling production requirement is met.
Example 10:
in this example, 3CR13 stainless steel is rolled, and the coil number: 92A692902, steel grade: 30CR13; the thickness of the blank is 200mm, the width of the blank is 1090mm, and the thickness of a rough rolling target is 35mm; the target thickness of the finished strip steel is 4.50mm, and the target width is 1115mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 35 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.4.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝35×1.4＝49(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames from F0 to F6 in finish rolling are respectively as follows: 375. 226, 697, 505, 233, 129, -32. After the rolling is finished, the actual convexity of the steel block is 47.3 mu m.
2. And determining the coiling tension.
According to Table 2, the unit tension of the log is 18.0N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.34.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝18.0×1.34＝24.12(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:4.5; f1 to F2:6.5; f2 to F3:8.5; f3 to F4:11.5; f4 to F5:13.5; f5 to F6:17.0.
and the plate shape of the coil in the cold rolling process is tracked under the control of the parameters, no edge wave is generated in the whole length, and the cold rolling production requirement is met.
Example 11:
in this example, 3CR13 stainless steel is rolled, and the coil number: 92A693001, steel grade: 30CR13; the thickness of the blank is 200mm, the width of the blank is 1090mm, and the thickness of the rough rolling target is 35mm; the target thickness of the finished strip steel is 3.50mm, and the target width is 1105mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 30 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.6.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝30×1.6＝48(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of the frames of finish rolling F0-F6 are respectively as follows: 103, 119, 356, 211, 315, -256, -411. After the rolling is finished, the actual convexity of the steel block is 50.1 mu m.
2. The coiling tension is determined.
According to Table 2, the unit tension of the log is 18.0N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.38.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝18.0×1.38＝24.84(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:6.0; f1 to F2:8.0; f2 to F3:10.0; f3 to F4:14.0 of the total weight of the mixture; f4 to F5:16.0; f5 to F6:19.0.
and tracking the plate shape of the coil in the cold rolling process according to the control of the parameters, wherein the full-length plate shape is normal, and the maximum bilateral wave height is 7mm, so that the cold rolling production requirement is met.
Example 12:
in this example, 3CR13 stainless steel is rolled, and the coil number: 92A693103, steel grade: 30CR13; the thickness of the blank is 200mm, the width of the blank is 1070mm, and the thickness of a rough rolling target is 35mm; the target thickness of the finished strip steel product is 2.95mm, and the target width is 1095mm.
The plate shape control parameters of the block of steel are as follows:
1. determining target convexity
According to Table 1, the original target convexity is 25 μm.
According to table 4, the roughness correction coefficient coff _ p of the martensitic stainless steel was 1.9.
According to equation (1), the final target convexity is determined as:
C40_new＝C40×coff_p＝25×1.9＝47.5(μm)
in order to achieve the target convexity, the roll bending force calculated values (KN) of all the frames in finish rolling are respectively as follows: -399, -298, -156, 257, 239, -169, -487. After the rolling is finished, the actual convexity of the steel block is 48.2 mu m.
2. And determining the coiling tension.
According to Table 2, the unit tension of the log is 20.0N/mm 2 。
According to Table 5, the winding tension correction coefficient coff _ c was 1.39.
According to equation (2), the final winding tension is determined as:
cten_new＝cten×coff_c＝20.0×1.39＝27.8(N/mm 2 )
3. determining tension between stands in finish rolling
According to Table 6, the unit tension (N/mm) between the stands in the finish rolling 2 ) Respectively as follows: f0 to F1:7.0; f1 to F2:8.5; f2 to F3:10.7; f3 to F4:14.5; f4 to F5:16.7; f5 to F6:19.7.
and (3) tracking the plate shape of the cold rolling procedure of the coil according to the control of the parameters, wherein the full-length plate shape is normal, and the maximum bilateral wave height is 9mm, thereby meeting the requirements of cold rolling production.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.
Claims (9)
1. A method for controlling the shape of a martensitic stainless steel sheet,
increasing the target convexity of a finishing mill group in a finishing rolling procedure according to the thickness of the steel plate;
the coiling tension is improved according to the principle that the smaller the thickness of the steel plate is, the larger the coiling tension is;
reducing the tension between the finishing mill stands.
2. A strip shape control method for martensitic stainless steel according to claim 1, characterized in that the target convexity calculation method is as follows:
C40_new＝C40×coff_p
wherein C40_ new is the target convexity, μm;
c40 is the original target convexity in mum;
coff _ p is a convexity correction coefficient.
3. A strip shape control method for martensitic stainless steel according to claim 2, wherein the convexity correction coefficient has a value in the range of:
。
4. A strip shape control method for a martensitic stainless steel according to claim 2 or 3, characterized in that the original target crown has the following value ranges:
。
5. A plate shape control method for a martensitic stainless steel according to claim 1, characterized in that the coiling tension calculation method is as follows:
cten_new＝cten×coff_c
wherein cten _ new is the winding tension, N/mm 2 ；
cten is the original winding tension, N/mm 2 ；
coff _ c is a winding tension correction coefficient.
6. A plate shape control method for a martensitic stainless steel according to claim 5, characterized in that the coiling tension correction coefficient has the following value range:
。
7. The strip shape control method for martensitic stainless steel according to claim 5 or 6, wherein the raw coiling tension has the following value range:
8. the method for controlling a plate shape of a martensitic stainless steel according to claim 1, wherein the finish rolling process rolls the martensitic stainless steel plate using 7 stands.
9. A method for controlling a plate shape of a martensitic stainless steel according to claim 8, wherein the tension between frames in the finish rolling step has the following values:
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