CN112547797A - Comprehensive control method for width and side turning of 430 stainless steel - Google Patents
Comprehensive control method for width and side turning of 430 stainless steel Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/22—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 plates, strips, bands or sheets of indefinite length
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Abstract
The invention provides a method for controlling the width and side turning of 430-series stainless steel, which comprises the following steps: (1) measuring the width of the stainless steel blank, and classifying the blank according to the width value; (2) further dividing various blanks according to the total side pressure; (3) determining the maximum side pressure of each pass of rough rolling and the calculated target width of a finished product according to the width classification and the total side pressure classification of the blank; (4) calculating the rough rolling calculation target width according to the rough rolling calculation target width (finished product calculation target width-finish rolling width) multiplied by the thermal expansion coefficient at the rough rolling outlet temperature, and controlling each pass of rough rolling according to the rough rolling calculation target width in the range of the maximum side pressure of each pass of rough rolling; (5) and determining whether to increase the unit tension value between the finish rolling stands according to whether the difference between the calculated target width of the finished product and the target width of the finished product exceeds 10 mm. By adopting the method, the unqualified width side-turning proportion can be obviously reduced, the quality control is stable, and the economic benefit is obvious.
Description
Technical Field
The invention relates to the technical field of metallurgical steel rolling, in particular to a comprehensive control method for the width and side turning of 430 stainless steel.
Background
The hot continuous rolling process is a way of producing steel, and generally uses a continuous casting billet or a primary rolling billet as a raw material. The billet is first heated in a heating furnace to a target temperature at a temperature specified in the process. The billet is then descaled by high pressure water and then fed into a roughing mill, typically with roughing vertical rolls controlling the width and flat rolls controlling the thickness. And rolling the strip steel by the rough rolling unit to enable the strip steel to reach preset target thickness, width and temperature, and then enabling the strip steel to enter the finishing rolling unit for continuous rolling to enable the strip steel to reach the preset target thickness and temperature. And finally, forming the strip steel into a steel coil through a coiling machine.
430 stainless steel is the most important species of 400 series stainless steel. 430 stainless steel is subjected to hot continuous rolling, is subjected to cold rolling in a cold rolling process, is subjected to edge cutting, and is delivered to users for use. In the hot continuous rolling rough rolling process of the stainless steel continuous casting billet, the rolled piece is forwards extended under the thickness reduction of a flat rolling pass, the rolled piece is widened to the side, surface metal generates friction force due to contact with a roller, so that retardation is caused to expansion, the deformation difference of the surface and the internal metal finally causes the upturning of corner and side metal to form a side turning defect, the side turning is represented as a black line about 2-35 mm away from the edge on a cold plate product, a defect high-occurrence area is formed between the side turning line and the edge of a steel plate, in order to meet the user quality requirement, the side turning area must be cut off, and if the side is cut according to the width required by a user, the surface of the steel plate is turned over and uncut, and an unqualified product with side turning and uncleanness is formed. If the width required by a user is 1220mm, the actual width of hot rolling is 1252mm, the maximum width of side turning is 23mm, and the 1220mm required by the user is reached, both sides are cut off by 32mm altogether during trimming, and each side is cut off by 16mm (the width of the trimming edges at both sides is required to be the same during trimming), so that 23-16 mm-7 mm side turning is left at the widest position of side turning after trimming, and waste is caused. Therefore, when the hot-rolled coil is used for cold rolling, if the width is small and the side turn is wide, the side turn is not completely cut to form waste products; if the width is wide and the side turning is small, the trimming is wasted and the yield is affected.
In the 430 stainless steel production process, the hot rolling target width is designed to be +30mm of the width required by a cold rolling user, positive tolerance control is carried out on the basis of the target width, under the condition that rollover can be completely cut, the deviation of the actual width of a finished product and the target width of the finished product is 0-15 mm, the deviation of the width is an optimal control range, the deviation of the width is 0-25 mm, the width deviation exceeds 25mm, the width is ultra-wide, and the deviation of the width is less than 0mm, and the width is negative.
For a long time, the problem of 430 width and rollover control is a difficult problem which puzzles quality problems and is not thoroughly solved for a long time. There are mainly the following problems:
1. the following rules are derived from the process study: the rough rolling side pressure (namely the rough rolling vertical roll pressure) has a correlation influence on the side turn width, namely the larger the rough rolling side pressure is, the wider the side turn is; the smaller the side pressure, the narrower the rollover. And the influence of the first-path side pressure on side rollover is obvious compared with the third-path secondary-side pressure, and after the first-path secondary-side pressure exceeds 500-600 KN and the third-path secondary-side pressure exceeds a certain threshold value in an area of 1000-1200 KN, the side rollover width can be rapidly widened. Therefore, in the rolling process, the rough rolling is carried out without side pressure rolling or small side pressure rolling as much as possible, particularly the limit pressure areas of the first pass and the third pass cannot be exceeded, but the width fluctuation of the finished product is very large due to the large fluctuation of the width of the 430 blank, the finished product width fluctuation caused by the small side pressure rolling method is only about 57%, the qualified rate of the finished product with the width of 0-15 mm is only about 57%, the side cutting is easy to cause by wide negative pressure, the ultra-wide side cutting is easy to cause the increase of the trimming amount of the next process, and the yield is reduced.
2. Because the small side pressure rolling affects the large yield, a fixed width rolling method is adopted, namely the width of a hot continuous rolling finished product is controlled according to the width deviation of 5-15 mm, but the side pressure of the fixed width rolling is not controlled, so that the side rolling width fluctuation is large, the side rolling incomplete roll after cold rolling trimming is increased obviously, the width side rolling initial failure rate is increased from 3.61% to more than 6%, waste products are increased due to the method, the fixed width control method is unsuccessful, and the small side pressure control method is only recovered.
Because the two control methods have the defects mutually and have adverse effects on both width and rollover control, the problem of width and rollover control has not been thoroughly solved for a long time.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a comprehensive control method for the width and the side turning of 430-series stainless steel.
The invention realizes the above purposes by the following technical scheme:
a method for controlling width and side turning of stainless steel comprises the following steps: (1) measuring the width of the stainless steel blank, and classifying the blank according to the width value; (2) further dividing various blanks according to the total side pressure; (3) determining the maximum side pressure of each pass of rough rolling and the calculated target width of a finished product according to the width classification and the total side pressure classification of the blank; (4) calculating the rough rolling calculation target width according to the rough rolling calculation target width (finished product calculation target width-finish rolling width) multiplied by the thermal expansion coefficient at the rough rolling outlet temperature, and controlling each pass of rough rolling according to the rough rolling calculation target width in the range of the maximum side pressure of each pass of rough rolling; (5) and determining whether to increase the unit tension value between the finish rolling stands according to whether the difference between the calculated target width of the finished product and the target width of the finished product exceeds 10 mm.
Compared with the prior art, the method for controlling the width and the side turning of the stainless steel at least has the following beneficial effects: by adopting the control method, the unqualified width side-turning proportion is reduced from 3.61% to about 1.01%, the quality control is stable, and the economic benefit is obvious.
Drawings
Fig. 1 shows the thermal expansion coefficient curve of 430 stainless steel.
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.
At present, the rough rolling method of 430 series stainless steel comprises the following steps:
the method comprises the following steps of rough rolling of a rough rolling frame for five passes, wherein the thickness of a flat roll is controlled, the load is distributed for five passes, the rolling pressure and the roll gap of each pass are calculated according to the rough rolling target thickness and the load distribution, the width of a vertical roll is controlled, the width is controlled only in an odd pass by controlling the side pressure, namely the width is controlled by calculating the side pressure in the first, third and fifth passes, and each pass is calculated and controlled according to a width target value. The following two control methods are respectively adopted in the 430 width control process:
the first control method comprises the following steps: the method of small side pressure rolling is adopted, namely the first pass has no side pressure, the third pass has no side pressure exceeding 10mm, the fifth pass has no side pressure exceeding 25mm, the side pressure is limited in a rough rolling control program to carry out rough rolling width control, but because the blank width fluctuation is large, the qualification rate of controlling the finished product width target value of 0-15 mm by the method can only reach about 57%, wherein the ultra-wide roll accounts for about 42%.
The second control method comprises the following steps: in order to reduce the cold rolling trimming amount of 430 stainless steel and improve the yield, a width rolling method is adopted, namely the 430 stainless steel is accurately controlled according to a width target value of 0-15 mm, the width control takes the width target value of +7.5mm as a width calculation target value, the rough rolling side pressure is not limited, the side pressure amount of each pass is calculated according to the width calculation target value to achieve the aim of accurately controlling the width, the width qualification rate of a hot continuous rolling finished product with the width deviation of 0-15 mm reaches about 95 percent by adopting the method, but the side turning width is obviously increased, so that the number of unqualified coils after cold rolling trimming is increased, the width side turning unqualified proportion reaches more than 6 percent, and then the small side pressure control is recovered, namely the first control method.
The two control methods can not meet the width side turning requirement, and when the quality of the stainless steel is judged in the post-process, the width side turning failure rate of the first control method is about 3.61% based on the fact that no side turning defect exists after trimming.
In order to solve the above problems, the inventor of the present invention has creatively proposed a comprehensive control method for the width and the rollover of the 430-series stainless steel through research.
The comprehensive control method is mainly based on the analysis of the following process principles: the most key factor influencing the side turning in the hot rolling process is the influence of the rough rolling side pressure, the side pressure of a first pass is the most influencing the side turning, and the larger the pressure of the first pass side is, the larger the side turning is; and secondly, performing a third pass, wherein the larger the lateral pressure is, the larger the side turning is. After the pressure of the primary secondary side exceeds 500-600 KN and the pressure of the tertiary secondary side exceeds a certain threshold value in an area of 1000-1200 KN, the rollover width can be rapidly widened.
Based on the process analysis, and considering that the fifth pass can not adopt the large-side pressure rolling (the fifth pass adopts the large-side pressure rolling to cause the steel lifting and other steel scrap faults), the inventor of the invention adopts the following ideas on the control method: the fifth pass adopts small side pressure rolling, the width control mainly takes the first pass and the third pass as the standard, firstly, different finished product target calculation widths are determined according to the size of the total side pressure (blank width-finished product target width), the target value is calculated according to the finished product width, and then the rough rolling width target value is calculated, and the calculation method comprises the following steps: the rough rolling width target value is (finished product width calculation target value-finish rolling width value) x rough rolling outlet temperature thermal expansion coefficient. Calculating the side pressure of each pass according to the rough rolling width target value, wherein the side pressure distribution scheme is as follows: when the third side pressure is ensured to be less than 1000KN and can meet the width requirement, the first time is carried out without side pressure, and the third time is carried out according to the principle of precise width control; only when the third pass can not meet the width requirement, the side pressure is gradually increased for the first pass but can not exceed 500KN, and meanwhile, the target calculated value of the width is correspondingly increased; when the target value of the rough rolling width obviously causes the actual width of a finished product to be over-wide, the actual width expansion of finish rolling is reduced by increasing the unit tension between the frames of the finish rolling mill, so that the over-wide phenomenon is reduced.
The overall control method adopted by the inventor of the present invention is: aiming at the difference of 430 stainless steel total side pressure (blank width-finished product target width), the finished product width is classified and accurately controlled by sections, and the classification control method comprises the following steps: 1) when the total lateral pressure is small, the first pass of no lateral pressure and the third pass of limited lateral pressure are adopted for rolling; 2) when the single third secondary side pressure can not meet the width precision, the first secondary side pressure is increased gradually along with the increase of the side pressure amount, but the rough rolling width calculation target value is increased along with the increase of the side pressure threshold value for ensuring that the side pressure threshold value influencing the side turnover is not exceeded.
Specifically, the comprehensive control method for the width and the rollover of the 430-series stainless steel comprises the following steps of:
(1) and measuring the width of the stainless steel blank, and classifying the blank according to the width value.
Specifically, the blank is divided into a blank with the width of less than or equal to 1200mm, a blank with the width of 1200-1270 mm (namely 1200mm < width of less than or equal to 1270mm) and a blank with the width of more than 1270mm according to the width value. The width of the blank is different, and the control strategy is different.
(2) And further dividing various blanks according to the total side pressure.
On the basis of the classification in the step (1), further dividing the blank with the width of less than or equal to 1200mm, the blank with the width of 1200-1270 mm and the blank with the width of more than 1270mm into a blank with the total pressure measurement of less than or equal to-8 mm, a blank with the total pressure measurement of-8 to-3 mm (namely-8 mm is less than the total pressure measurement of less than or equal to-3 mm), a blank with the total pressure measurement of-3 to 2mm (namely-3 mm is less than the total pressure measurement of less than or equal to 2mm), a blank with the total pressure measurement of 2-7 mm (namely 2mm is less than the total pressure measurement of less than or equal to 7mm) and a blank with the total pressure measurement of.
(3) And determining the maximum side pressure of each pass of rough rolling and the calculated target width of the finished product according to the width classification and the total side pressure classification of the blank.
And determining the maximum side pressure of each pass of rough rolling according to the classification of the blank width and the difference of the total side pressure. The maximum side pressure is the upper limit side pressure of the current pass, and when the calculated side pressure of each pass exceeds the maximum side pressure during width calculation, the maximum side pressure is calculated and controlled. According to comprehensive analysis of width and side-turning influence and continuous research in the actual operation process, the inventor finally determines that the maximum side pressure of each pass is as shown in the following table 1:
table 1: maximum side pressure of each pass
(4) And calculating the rough rolling calculation target width, and controlling each pass of rough rolling according to the rough rolling calculation target width in the range of the maximum side pressure of each pass of rough rolling.
According to the difference of the blank width and the total side pressure, different calculation target widths of the finished product are determined, and the calculation target width of the finished product is determined according to the width of the finished product and the total side pressure, namely the larger the total side pressure is, the wider the calculation target width of the finished product is. After the calculation target width of the finished product is obtained, calculating the calculation target width of rough rolling according to the calculated finish rolling width, and calculating according to the following formula:
the rough rolling calculation target width is (finished product calculation target width-finish rolling width) x the thermal expansion coefficient at the rough rolling exit temperature.
The method for determining the finish rolling spread comprises the following steps:
1) calculating the actual finish rolling width of each rolled steel, recording the actual finish rolling width together with the corresponding steel type, thickness and width, and establishing a database; the method for calculating the actual width of each piece of steel comprises the following steps: and actual finish rolling width is the actual width of the finish rolling outlet-the actual width of the rough rolling outlet, wherein the actual width of the rough rolling outlet and the actual width of the finish rolling outlet refer to actual values in a cold state.
2) Reading the finish rolling spread: the confirmation of the finish rolling and the width expansion of the steel block is divided into two cases of long genetic value and short genetic value. The determination conditions of the long genetic value are as follows: a) when the steel grade of the block of steel is inconsistent with that of the upper block of steel, taking a long genetic value; b) when the thickness of the steel block is more than or equal to 10% of that of the upper steel block, taking a long genetic value; c) and when the width of the steel block is more than or equal to 10% of the width of the upper steel block, taking the long genetic value. If one of the three conditions is satisfied, the long genetic value is selected.
The method for determining the finish rolling width according to the long genetic value comprises the following steps: taking the average value of the actual spreads of the 30 close pieces of steel in the database determined in the step 1) as the actual spread of the steel. And when the number of the approaching steels in the database is less than 30 pieces of steel, taking the average value of the finish rolling and the broadening of the actual number of the steel pieces. When the steel grade does not exist in the database, the default value of the finish rolling width value is 3.0 mm.
The determination conditions of the short genetic value are as follows: and when the change of the steel grade, the thickness and the width is less than 10%, taking a short genetic value, namely a calculated value of finish rolling and widening of the upper steel block.
The thermal expansion coefficient refers to the ratio of the hot-state width value and the cold-state width value of the expanded strip steel at different temperatures, and the method for determining the thermal expansion coefficient of the 430 stainless steel at each temperature comprises the following steps:
the coefficient of thermal expansion at a particular temperature is determined from the coefficient of thermal expansion curves for 430 stainless steel at different temperatures determined by the following experiments, the coefficient of thermal expansion curve for 430 stainless steel being shown in fig. 1:
the specific temperature and thermal expansion coefficient corresponding data are:
| temperature (. degree.C.) | 800 | 825 | 850 | 875 | 900 | 925 | 950 |
| Coefficient of thermal expansion | 1.015245 | 1.015857 | 1.016459 | 1.017051 | 1.017632 | 1.01819 | 1.018731 |
| Temperature (. degree.C.) | 975 | 1000 | 1025 | 1050 | 1075 | 1100 | 1125 |
| Coefficient of thermal expansion | 1.018879 | 1.01899 | 1.01964 | 1.02113 | 1.021781 | 1.022473 | 1.023188 |
| Temperature (. degree.C.) | 1150 | 1175 | 1200 | 1225 | 1250 | 1275 | |
| Coefficient of thermal expansion | 1.023924 | 1.02468 | 1.025454 | 1.026245 | 1.027051 | 1.02787 |
The value taking method comprises the following steps:
assuming that the temperature at each point of the curve is t1, t2, t3 … t20, the thermal expansion coefficient at each point is y1, y2, y3 … y20, the temperature at each point is represented by t (i), and the thermal expansion coefficient at each point is represented by y (i).
Let the rough rolling outlet temperature be t and the thermal expansion coefficient be y.
If t ═ t (i), then y ═ y (i);
if t is between t (i) and t (i +1), y ═ y (i) + [ t-t (i) ] [ y (i +1) -y (i)) ]/[ t (i +1) -t (i)) ].
And in the range of the maximum side pressure, each pass is controlled according to the rough rolling calculation target width. The side pressure is increased, so that the side turning is widened, and the aim of controlling each pass according to the rough rolling calculation target width is to increase the actual width of a finished product under the condition of increasing the side pressure, so that the phenomenon that the side turning in the cold rolling process is not clean is solved. The rule of the calculated target width of the finished product determined from the width of the blank and the total side pressure is shown in table 2:
table 2: target width of finished product calculation in total side pressure range
(5) And when the difference value between the calculated target width of the finished product and the target width of the finished product exceeds 10mm, increasing the unit tension value between the frames of finish rolling.
According to the difference value between the target width of the finished product and the target width of the finished product, and aiming at the condition that the difference value between the target width of the finished product and the target width of the finished product exceeds 10mm, the unit tension value between the stand frames of finish rolling is automatically increased, so that the finish rolling spread value (the finish rolling spread is the actual width of a finish rolling outlet-the actual width of a rough rolling outlet) is reduced, and the aim of improving the width control precision can be achieved on the premise of not increasing the rollover risk. The unit tension compensation value rule between the stands of the finish rolling is shown in table 3.
Table 3: unit tension compensation value between frames of finish rolling
The above-mentioned F0, F1, F2, F3, F4, F5, and F6 refer to the numbers of the respective stands of the finishing mill group.
In table 3, the inter-stand tension of the finish rolling mill refers to the tension existing between the two stands of the finish rolling mill, for example, the tension between F2 and F3 refers to the tension between the two stands of F2 and F3, and the tension between F3 and F4 refers to the tension between the two stands of F3 and F4.
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
This example rolled 430 steel grade with a hot rolled coil number of 907650301.
The specification of the blank is as follows: the thickness is 200mm, the width is 1085mm, and the length is 9530 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 2.8mm, target width 1110mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1085mm, the width of the finished product is 1110mm, and the total side pressure is 1085 and 1110 is-13 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 0, 70 and 25 respectively. According to table 2, the final product calculated target width +5mm + 1115mm is determined, and then the rough rolling calculated target width is 1131 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: the thickness is 2.8mm, the target width is 1110mm, and the target width of the finished product is calculated to be 1115 mm. According to Table 3, the unit tensions between the stands of the finish rolling are as follows without compensation of tension:
after the rolling of the steel block is finished, the steel block is measured through a cold rolling process, the actual thickness is 2.81, the actual width is 1113mm, the side-turning width is 14.6mm, the width is 1080mm after the edge cutting, the phenomenon of side-turning and incomplete cutting is avoided, and the requirements of users are met.
Example 2
This example rolled 430 steel grade with a hot rolled coil number of 908610101.
The specification of the blank is as follows: the thickness is 200mm, the width is 1147mm, and the length is 9230 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 2.8mm, target width 1150mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the blank width 1147mm, the finished product width 1150mm, the total side pressure 1147 and 1150 mm-7 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 5, 73 and 30 respectively. According to table 2, the final product calculated target width is determined to be 1157mm +7mm, and then 1172mm is calculated. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: thickness 2.8mm, target width 1150mm, finished product calculated target width 1157 mm. According to Table 3, the unit tensions between the stands of the finish rolling are as follows without compensation of tension:
after the rolling of the steel block is finished, the steel block is measured through a cold rolling process, the actual thickness is 2.79, the actual width is 1158mm, the side turning width is 15.1mm, the width is 1120mm after the side cutting, the phenomenon of side turning and incomplete cutting is avoided, and the requirements of users are met.
Example 3
This example rolled 430 steel grade with a hot rolled coil number of 908792201.
The specification of the blank is as follows: the thickness is 200mm, the width is 1041m, and the length is 9230 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 3.45mm, target width 1040mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1041mm, the width of the finished product is 1040mm, and the total side pressure is 1041mm and 1040 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 7, 80 and 35 respectively. According to table 2, the final product calculated target width is determined to be 1050mm, and then the rough rolling calculated target width is 1072 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: the thickness is 3.45mm, the target width is 1040mm, and the target width of the finished product is 1050 mm. According to Table 3, the unit tensions between the stands of the finish rolling are as follows without compensation of tension:
after the rolling of the steel block is finished, the actual thickness is 3.45, the actual width is 1052mm, the side-turning width is 18.9mm, the width after the edge cutting is 1010mm, the phenomenon of incomplete side-turning and side-turning is avoided, and the requirements of users are met. .
Example 4
This example rolled 430 steel grade with a hot rolled coil number of 908792302.
The specification of the blank is as follows: the thickness is 200mm, the width is 1044m, and the length is 9225 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 3.45mm, target width 1040mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1044mm, the width of the finished product is 1040mm, and the total side pressure is 1044mm and 1040mm is 4 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 15, 85 and 35 respectively. According to table 2, the final product calculated target width is determined to be 1055mm +15mm, and then 1077mm is calculated. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: the thickness is 3.45mm, the target width is 1040mm, and the final product calculated target width is 1055 mm. According to Table 3, the tension compensation values (N/mm)2) 2, 2 and 2 respectively, and the unit tension between the frames of the finish rolling is as follows:
after the rolling of the steel block is finished, the actual thickness of the steel block is 3.46, the actual width of the steel block is 1053mm, the side-turning width of the steel block is 20.7mm, the width of the steel block after edge cutting is 1010mm, the phenomenon of incomplete side-turning and cutting is avoided, and the requirements of users are met.
Example 5
This example rolled 430 steel grade with a hot rolled coil number of 908798202.
The specification of the blank is as follows: thickness 200mm, width 1121m, length 10281 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 5.95mm, target width 1110mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1121mm, the width of the finished product is 1110mm, and the total side pressure is 1121mm and 1110 is 11 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 20, 87 and 35 respectively. According to table 2, the final product calculated target width +20 mm-1130 mm is determined, and then the rough rolling calculated target width is 1154 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: thickness 5.95mm, target width 1110mm, finished product calculated target width 1130 mm. According to Table 3, the tension compensation values (N/mm)2) 5, 4, 3 and 3 respectively, and the unit tension between the frames of the finish rolling is as follows:
after the rolling of the steel block is finished, the actual thickness of the steel block is 5.96, the actual width of the steel block is 1126mm, the side-turning width of the steel block is 21.9mm, the width of the steel block after the side cutting is 1080mm, the phenomenon of side-turning and incomplete cutting is avoided, and the requirements of users are met.
Example 6
This example rolled 430 steel grade with a hot rolled coil number of 908782201.
The specification of the blank is as follows: 200mm in thickness, 1240mm in width and 9831mm in length; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 3.6mm, target width 1250mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the blank width is 1240mm, the finished product width is 1250mm, and the total side pressure is 1240 and 1250mm and 10 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 0, 65 and 25 respectively. According to table 2, the calculated target width of the finished product is determined to be 1255mm which is the target width of the finished product +5mm, and then the calculated target width of the rough rolling is 1283 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: the thickness is 3.6mm, the target width is 1250mm, and the target width of the finished product is 1255 mm. According to Table 3, the unit tensions between the stands of the finish rolling are as follows without compensation of tension:
after the rolling of the steel block is finished, the measured cold rolling process shows that the actual thickness is 3.59, the actual width is 1256mm, the side-turning width is 14.4mm, the width after the edge cutting is 1220mm, the phenomenon of incomplete side-turning and cutting is avoided, and the requirements of users are met.
Example 7
This example rolled 430 steel grade with a hot rolled coil number of 908782301.
The specification of the blank is as follows: the thickness is 200mm, the width is 1245mm, and the length is 10280 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 2.8mm, target width 1250mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1245mm, the width of the finished product is 1250mm, and the total side pressure is 1245 and 1250 is-5 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 3, 70 and 30 respectively. According to table 2, the calculated target width of the finished product is determined to be 1257mm which is the target width of the finished product +7mm, and then the calculated target width of the rough rolling is 1282 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: the thickness is 2.8mm, the target width is 1250mm, and the target width of the finished product is 1257 mm. According to Table 3, the unit tensions between the stands of the finish rolling are as follows without compensation of tension:
after the rolling of the steel block is finished, the steel block is measured by a cold rolling process, the actual thickness is 2.81, the actual width is 1256mm, the side-turning width is 15.4mm, the width after trimming is 1220mm, the phenomenon of incomplete side-turning and cutting is avoided, and the requirements of users are met.
Example 8
This example rolled 430 steel grade with a hot rolled coil number of 908782417.
The specification of the blank is as follows: 200mm in thickness, 1250m in width and 9803mm in length; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 4.00mm, target width 1250mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1250mm, the width of the finished product is 1250mm, and the total side pressure is 1250 and 1250 is 0 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 5, 75 and 33 respectively. According to table 2, the calculated target width of the finished product is determined to be 1260mm +10mm, and then 1285mm is calculated as the calculated target width of the rough rolling. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: thickness 4.0mm, target width 1250mm, finished product calculated target width 1260 mm. According to Table 3, the unit tensions between the stands of the finish rolling are as follows without compensation of tension:
after the rolling of the steel block is finished, the steel block is measured by a cold rolling process, the actual thickness is 4.00mm, the actual width is 1259mm, the side turning width is 18.3mm, the width after trimming is 1220mm, the phenomenon of incomplete side turning and cutting is avoided, and the requirements of users are met.
Example 9
This example rolled 430 steel grade with a hot rolled coil number of 908791503.
The specification of the blank is as follows: 200mm in thickness, 1257mm in width and 10279mm in length; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 3.85mm, target width 1250mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1257mm, the width of the finished product is 1250mm, and the total side pressure is 1257 and 1250 is 7 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 10, 80 and 35 respectively. According to table 2, the calculated target width of the finished product is 1263mm +13mm, and then 1287mm is calculated as the calculated target width of the rough rolling. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: thickness 3.85mm, target width 1250mm, finished product calculated target width 1263 mm. According to Table 3, the tension compensation values (N/mm)2) 2, 1 and 1 respectively, and the unit tension between the frames of the finish rolling is as follows:
after the rolling of the steel block is finished, the actual thickness of the steel block is 3.86, the actual width of the steel block is 1262mm, the side-turning width of the steel block is 19.9mm, the width of the steel block after edge cutting is 1220mm, the phenomenon of side-turning and incomplete cutting is avoided, and the requirements of users are met.
Example 10
This example rolled 430 steel grade with a hot rolled coil number of 908778105.
The specification of the blank is as follows: thickness 200mm, width 1259m, length 10278 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 2.90mm, target width 1250mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1259mm, the width of the finished product is 1250mm, and the total side pressure is 1259-1250-9 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 15, 85 and 35 respectively. According to table 2, the final product calculated target width +18mm 1268mm is determined, and then the rough rolling calculated target width is 1291 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: thickness 2.90mm, target width 1250mm, finished product calculated target width 1268 mm. According to Table 3, the tension compensation values (N/mm)2) 3, 3 and 3 respectively, and the unit tension between the frames of the finish rolling is as follows:
after the rolling of the steel block is finished, the steel block is measured by a cold rolling process, the actual thickness is 2.89 mm, the actual width is 1264mm, the side-turning width is 21.1mm, the width after edge cutting is 1220mm, the phenomenon of incomplete side-turning and cutting is avoided, and the requirements of users are met.
Example 11
This example rolled 430 steel grade with a hot rolled coil number of 908764701.
The specification of the blank is as follows: 200mm in thickness, 1281mm in width and 10280mm in length; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 6.09mm, target width 1290mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1281mm, the width of the finished product is 1290mm, and the total side pressure is 1281 and 1290 is-9 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 0, 65 and 25 respectively. According to table 2, the final product calculated target width +5 mm-1295 mm is determined, and then the rough rolling calculated target width is 1319 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: the thickness is 6.09mm, the target width is 1290mm, and the calculated target width of the finished product is 1295 mm. According to Table 3, the unit tensions between the stands of the finish rolling are as follows without compensation of tension:
after the rolling of the steel block is finished, the actual thickness is 6.01, the actual width is 1295mm, the side-turning width is 13.9mm, the width after the edge cutting is 1260mm, the phenomenon of side-turning and incomplete cutting is avoided, and the requirements of users are met.
Example 12
This example rolled 430 steel grade with a hot rolled coil number of 908764801.
The specification of the blank is as follows: 200mm in thickness, 1286mm in width and 10278mm in length; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 5.09mm, target width 1290mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1286mm, the width of the finished product is 1290mm, and the total side pressure is 1286 and 1290 is-4 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 3, 70 and 30 respectively. According to table 2, the final product calculated target width +7 mm-1297 mm is determined, and then the rough rolling calculated target width is 1326 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: thickness 5.09mm, target width 1290mm, finished product calculated target width 1297 mm. According to Table 3, the unit tensions between the stands of the finish rolling are as follows without compensation of tension:
after the rolling of the steel block is finished, the steel block is measured by a cold rolling process, the actual thickness is 5.11, the actual width is 1298mm, the side-turning width is 15.9mm, the width after trimming is 1260mm, the phenomenon of side-turning and incomplete cutting is avoided, and the requirements of users are met.
Example 13
This example rolled 430 steel grade with a hot rolled coil number of 908767102.
The specification of the blank is as follows: 200mm in thickness, 1291m in width and 10276mm in length; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 4.59mm, target width 1290mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1291mm, the width of the finished product is 1290mm, and the total side pressure is 1291 and 1290 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 5, 75 and 33 respectively. According to table 2, the final product calculated target width +10mm is determined to 1300mm, and then the rough rolling calculated target width is 1329 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: the thickness is 4.59mm, the target width is 1290mm, and the calculated target width of the finished product is 1300 mm. According to Table 3, the unit tensions between the stands of the finish rolling are as follows without compensation of tension:
after the rolling of the steel block is finished, the actual thickness is 4.58mm, the actual width is 1301mm, the side-turning width is 17.9mm, the width after the trimming is 1260mm, the phenomenon of incomplete side-turning and side-turning is avoided, and the requirements of users are met.
Example 14
This example rolled 430 steel grade with a hot rolled coil number of 908796905.
The specification of the blank is as follows: 200mm in thickness, 1296mm in width and 10278mm in length; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 3.45mm, target width 1290mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1296mm, the width of the finished product is 1290mm, and the total side pressure is 1296mm and 1290mm is 6 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 8, 79 and 35 respectively. According to table 2, the final product calculated target width +13 mm-1303 mm is determined, and then the rough rolling calculated target width is 1338 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: the thickness is 3.45mm, the target width is 1290mm, and the finished product has a calculated target width of 1303 mm. According to Table 3, the tension compensation values (N/mm)2) 2, 1 and 1 respectively, and the unit tension between the frames of the finish rolling is as follows:
after the rolling of the steel block is finished, the actual thickness of the steel block is 3.46, the actual width of the steel block is 1303mm, the side-turning width of the steel block is 19.3mm, the width of the steel block after edge cutting is 1260mm, the phenomenon of incomplete side-turning and cutting is avoided, and the requirements of users are met.
Example 15
This example rolled 430 steel grade with a hot rolled coil number of 908809202.
The specification of the blank is as follows: thickness 200mm, width 1300m, length 10277 mm; the thickness of a rough rolling outlet is 35mm, and the specification of a finish rolling finished product is as follows: target thickness 3.95mm, target width 1290mm, target temperature 860 ℃.
And heating the blank by a heating furnace, discharging, and carrying out rough rolling by five passes after discharging, wherein the outlet thickness is 35 mm.
1) Calculating rough rolling parameters:
the width of the blank is 1300mm, the width of the finished product is 1290mm, and the total side pressure is 1300-1290-10 mm. According to the table 1, the maximum side pressure (mm) of the first, third and fifth passes of rough rolling is determined to be 13, 82 and 35 respectively. According to table 2, the final product calculated target width +17mm is 1307mm, and then the rough rolling calculated target width is 1342 mm. The rough rolling has the following rolling parameters:
note: the set pressure means the calculated pressure, and the set roll gap means the calculated roll gap.
2) Calculating the unit tension between the frames of the finishing mill:
the specification of the finish rolling finished product is as follows: thickness 3.95mm, target width 1290mm, finished product calculated target width 1307 mm. According to Table 3, the tension compensation values (N/mm)2) 3, 2 and 2 respectively, and the unit tension between the frames of the finish rolling is as follows:
after the rolling of the steel block is finished, the actual thickness of the steel block is 3.94, the actual width of the steel block is 1315mm, the side turning width of the steel block is 20.7mm, the width of the steel block after the side cutting is 1260mm, the phenomenon of side turning and incomplete cutting is avoided, and the requirements of users are met.
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 method for controlling the width and the rollover of 430-series stainless steel is characterized by comprising the following steps:
(1) measuring the width of the stainless steel blank, and classifying the blank according to the width value;
(2) further dividing various blanks according to the total side pressure;
(3) determining the maximum side pressure of each pass of rough rolling and the calculated target width of a finished product according to the width classification and the total side pressure classification of the blank;
(4) calculating the rough rolling calculation target width according to the rough rolling calculation target width (finished product calculation target width-finish rolling width) multiplied by the thermal expansion coefficient at the rough rolling outlet temperature, and controlling each pass of rough rolling according to the rough rolling calculation target width in the range of the maximum side pressure of each pass of rough rolling;
(5) and determining whether to increase the unit tension value between the finish rolling stands according to whether the difference between the calculated target width of the finished product and the target width of the finished product exceeds 10 mm.
2. The control method according to claim 1, wherein in the step (1), the width of the stainless steel billet is measured, and the billet is divided into a billet having a width of 1200mm or less, a billet having a width of 1200 to 1270mm, and a billet having a width of more than 1270mm according to the width value.
3. The control method according to claim 2, wherein in the step (2), the blanks are respectively divided into a total pressure measuring amount of less than or equal to-8 mm, a total pressure measuring amount of-8 to-3 mm, a total pressure measuring amount of-3 to 2mm, a total pressure measuring amount of 2 to 7mm and a total pressure measuring amount of more than 7mm according to the total pressure measuring amount.
4. The control method according to claim 3, wherein in step (3), for the billet with the width of 1200mm or less, the standard for determining the maximum side pressure amount of each pass of rough rolling is as follows:
when the total pressure measurement is less than or equal to-8 mm, the first pass is 0mm, the third pass is 70mm, and the fifth pass is 25 mm;
when the total pressure measurement is-8 to-3 mm, the first pass is 5mm, the third pass is 73mm, and the fifth pass is 30 mm;
when the total pressure measurement is-3-2 mm, the first pass is 7mm, the third pass is 80mm, and the fifth pass is 35 mm;
when the total pressure measurement is 2-7 mm, the first pass is 15mm, the third pass is 85mm, and the fifth pass is 35 mm;
when the total load capacity is larger than 7mm, the first pass is 20mm, the third pass is 87mm, and the fifth pass is 35 mm.
5. The control method according to claim 3, wherein in the step (3), for the billet having a width of 1200 to 1270mm, the criterion for determining the maximum side pressure amount of each pass of rough rolling is:
when the total pressure measurement is less than or equal to-8 mm, the first time is 0mm, the third time is 65mm, and the fifth time is 25 mm;
when the total pressure measurement is-8 to-3 mm, the first pass is 3mm, the third pass is 70mm, and the fifth pass is 30 mm;
when the total pressure measurement is-3-2 mm, the first pass is 5mm, the third pass is 75mm, and the fifth pass is 33 mm;
when the total pressure measurement is 2-7 mm, the first pass is 10mm, the third pass is 80mm, and the fifth pass is 35 mm;
when the total load capacity is larger than 7mm, the first pass is 15mm, the third pass is 85mm, and the fifth pass is 35 mm.
6. A control method according to claim 3, characterized in that in step (3), for a billet with a width > 1270mm, the criterion for determining the maximum side pressure of each pass of rough rolling is:
when the total pressure measurement is less than or equal to-8 mm, the first time is 0mm, the third time is 65mm, and the fifth time is 25 mm;
when the total pressure measurement is-8 to-3 mm, the first pass is 3mm, the third pass is 70mm, and the fifth pass is 30 mm;
when the total pressure measurement is-3-2 mm, the first pass is 5mm, the third pass is 75mm, and the fifth pass is 33 mm;
when the total pressure measurement is 2-7 mm, the first pass is 8mm, the third pass is 79mm, and the fifth pass is 35 mm;
when the total load capacity is larger than 7mm, the first pass is 13mm, the third pass is 82mm, and the fifth pass is 35 mm.
7. A control method according to claim 3, characterized in that in step (3), for a blank having a width of 1200mm or less, the criterion for determining the calculated target width of the finished product is:
when the total pressure measurement is less than or equal to-8 mm, the calculated target width of the finished product is equal to the target width of the finished product plus 5 mm;
when the total pressure measurement is-8 to-3 mm, the calculated target width of the finished product is +7 mm;
when the total pressure measurement is-3-2 mm, the calculated target width of the finished product is equal to the target width of the finished product plus 10 mm;
when the total pressure measurement is 2-7 mm, the calculated target width of the finished product is equal to the target width of the finished product plus 15 mm;
and when the total pressure measurement is larger than 7mm, the calculated target width of the finished product is equal to the target width of the finished product plus 20 mm.
8. The control method according to claim 3, wherein in the step (3), for the blank having a width of 1200 to 1270mm, the criterion for determining the calculated target width of the finished product is:
when the total pressure measurement is less than or equal to-8 mm, the calculated target width of the finished product is equal to the target width of the finished product plus 5 mm;
when the total pressure measurement is-8 to-3 mm, the calculated target width of the finished product is +7 mm;
when the total pressure measurement is-3-2 mm, the calculated target width of the finished product is equal to the target width of the finished product plus 10 mm;
when the total pressure measurement is 2-7 mm, the calculated target width of the finished product is equal to the target width of the finished product plus 13 mm;
and when the total pressure measurement is larger than 7mm, the calculated target width of the finished product is equal to the target width of the finished product plus 18 mm.
9. A control method according to claim 3, characterized in that in step (3), for blanks with a width > 1270mm, the criterion for determining the calculated target width of the finished product is:
when the total pressure measurement is less than or equal to-8 mm, the calculated target width of the finished product is equal to the target width of the finished product plus 5 mm;
when the total pressure measurement is-8 to-3 mm, the calculated target width of the finished product is +7 mm;
when the total pressure measurement is-3-2 mm, the calculated target width of the finished product is equal to the target width of the finished product plus 10 mm;
when the total pressure measurement is 2-7 mm, the calculated target width of the finished product is equal to the target width of the finished product plus 13 mm;
and when the total pressure measurement is greater than 7mm, the calculated target width of the finished product is equal to the target width of the finished product plus 17 mm.
10. The control method according to claim 3, wherein in the step (5), when the difference between the calculated target width of the finished product and the target width of the finished product exceeds 10mm, the unit tension value between the stands of the finish rolling is increased; the standard for increasing the unit tension value among the frames of finish rolling is as follows:
wherein Fi represents an ith finish rolling stand, and i is an integer of 0 to 6.
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