A method for controlling a unit winding tension

Abstract

The present application belongs to the field of metallurgical rolling technology of metallurgical science and technology, and particularly relates to a unit coiling tension control method, comprising: (1) determining a given unit coiling tension of the strip steel according to experience and on-site debugging; (2) obtaining the yield strength of the strip steel at at least two coiling temperature measuring points through test; (3) calculating the yield strength of the strip steel at a coiling target temperature by using an interpolation method; and (4) determining the final unit coiling tension according to the yield strength at the coiling target temperature, the target thickness and the given unit coiling tension. The unit coiling tension control method of the present application basically solves the problems of poor coil shape and steel stacking, and improves the quality of the coil shape, with the coil shape qualified rate being increased from 40% to more than 70%, and the coiling over-flow phenomenon not occurring.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metallurgical rolling technology of metallurgical science and technology, and particularly relates to a unit coiling tension control method. BACKGROUND

[0002] The present application is a rolling control technology invented for tension control between the last stand of finishing mill and coiling unit of TISCO 1549 hot continuous rolling production line. Figure 1 As shown in the figure, the hot continuous rolling line is divided into a furnace area, a rough rolling area, a finishing rolling area and a coiling area. The main production process of the hot continuous rolling line is that the slab is firstly heated in the heating furnace according to the specified temperature, and after being heated to the target temperature, the slab is firstly rolled in the rough rolling mill, wherein the rough rolling mill controls the width by the vertical roll and controls the thickness by the horizontal roll, and the slab is reversibly rolled in the rough rolling mill, generally for 5-7 passes.

[0003] After rolling in the rough rolling mill, the strip steel reaches the pre-set target thickness, width and temperature. Then the strip steel enters the finishing rolling mill for seven-stand horizontal roll continuous rolling, so that the strip steel reaches the pre-set target thickness and temperature. Finally, the strip steel is formed into a steel coil by the coiling mill.

[0004] Coiling is the last process of hot rolling production, and its main process is to coil the strip steel after finishing rolling into a hot rolled steel coil. At the same time, in order to meet the normal use requirements of the subsequent process and users, it is necessary to ensure that the steel coil after coiling has good shape and does not have serious defects such as tower shape, layering, loose coil, flat coil and other coil shape defects. Among them, the coiling tension is one of the most important control parameters in the coiling process, and whether the coiling tension meets the requirements has a very important influence on the coil shape quality of the final product.

[0005] The main equipment in the coiling area includes a roller, a side guide plate, a pinch roll, a coiling aid and a winding drum, as shown in the figure. Figure 2 The roller mainly serves the purpose of transportation, transporting the strip steel rolled by the finishing mill to the coiling area for coiling. The main function of the side guide plate is to guide and center, guiding the strip steel into the coiling mill. The main function of the pinch roll is to bend the head of the strip steel and provide the rear tension after the strip steel is thrown. The main function of the coiling aid is to assist the shaping of the strip steel head during the biting stage, so that the strip steel head can be smoothly wound around the winding drum. The main function of the winding drum is to coil the strip steel into a coil and provide tension during the coiling process to ensure that the coiling process is stable and the coil quality meets the requirements.

[0006] The coiling tension refers to the tension between the winding drum and the last stand of the finishing mill. The size of the coiling tension has a very important influence on the coiling quality of the product, and too large or too small coiling tension will adversely affect the coiling quality.

[0007] The adverse effects of excessive tension on coiling quality mainly include: (1) excessive coiling tension may cause the width of the strip head to narrow between the finishing and coiling, and the narrowed part of the head must be cut off, affecting the coil shape and yield. (2) Excessive coiling tension may cause the coil drum current to exceed the limit, and then cause the coil drum to trip and damage the equipment. The adverse effects of insufficient tension on coiling quality include: (1) insufficient coiling tension may cause the strip head to not be wound smoothly on the coil drum, resulting in steel stacking in the coiler. (2) Insufficient coiling tension may cause the strip head to be poorly formed, resulting in a serious tower type or loose coil at the head of the coil. (3) Insufficient coiling tension may cause layering and cause scratches, etc. (4) For steel grades prone to flat coiling, insufficient coiling tension will further increase the degree of flat coiling, and then the inner diameter of the flat coiled coil cannot meet the user's machine requirements. (From the paper: Si Wenqiang, Wang Dong. Hot rolling coiling tension calculation and setting [J]. Metallurgical automation 2019 supplement. 2019: 166-168.)

[0008] In summary, determining the appropriate coiling tension is very important for coiling quality control.

[0009] The required tension during the coiling of the strip steel is related to the steel grade and specification, and the calculation method is:

[0010] T = cten x H x W (1)

[0011] In the formula, T represents the coiling tension, cten represents the unit coiling tension, H represents the thickness of the strip steel, and W represents the width of the strip steel.

[0012] Because the thickness and width of each piece of steel have a certain value, the most important thing in coiling tension control is to determine the value of the unit tension cten, and whether cten is accurate and reasonable plays a crucial role in coiling quality.

[0013] In the prior art, the unit coiling tension is mainly given according to experience, that is, the unit coiling tension value in different ranges is given by the process personnel according to the thickness and width range. Since the same unit tension is used in the given thickness range, when the thickness and coiling temperature change, the inadaptability of the coiling tension is very prominent, resulting in frequent occurrence of phenomena such as poor coil shape, steel stacking, and over-flowing. SUMMARY

[0014] The purpose of the present application is to overcome the defects of the prior art, and to provide a control method for unit coiling tension.

[0015] Specifically, the control method for unit coiling tension of the present application comprises:

[0016] (1) determining the given unit coiling tension of the strip steel according to experience and on-site debugging;

[0017] (2) obtaining the yield strength of the strip at at least two coiling temperature measuring points through experiments;

[0018] (3) calculating the yield strength of the strip at the target coiling temperature by using an interpolation method;

[0019] (4) determining the final unit coiling tension according to the yield strength at the target coiling temperature, the target thickness and a given unit coiling tension.

[0020] The unit coiling tension control method described above has the following calculation method for the unit coiling tension:

[0021] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0022] In the formula, cten is the unit coiling tension, N / mm 2 ;

[0023] cten_g is the given unit coiling tension, N / mm 2 ;

[0024] yield is the yield strength at the target coiling temperature, N / mm 2 ;

[0025] yield T is the reference yield strength, N / mm 2 ;

[0026] h T is the reference thickness, mm;

[0027] h is the target thickness of the strip, mm.

[0028] In the unit coiling tension control method described above, the reference yield strength is a fixed value of 150 N / mm 2 ; and the reference thickness is a fixed value of 2.0 mm.

[0029] In the unit coiling tension control method described above, when the target coiling temperature is equal to one of the coiling temperature measuring points in step (2), the yield strength of the strip at the target coiling temperature is equal to the yield strength at the coiling temperature measuring point.

[0030] In the unit coiling tension control method described above, when the target coiling temperature is between the two coiling temperature measuring points in step (2), the yield strength of the strip at the target coiling temperature meets the following equation:

[0031] [yield-yield(i)] / [T- T(i)] = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]

[0032] In the formula, yield is the yield strength of the strip at the target coiling temperature, N / mm 2 ;

[0033] yield(i) is the yield strength of the strip at the i th coiling temperature measurement point, N / mm 2 ;

[0034] T is the target coiling temperature of the strip, ℃;

[0035] T(i) is the temperature of the strip at the i th coiling temperature measurement point, ℃;

[0036] yield(i+1) is the yield strength of the strip at the i+1 th coiling temperature measurement point, N / mm 2 ;

[0037] T(i+1) is the temperature of the strip at the i+1 th coiling temperature measurement point, ℃.

[0038] The unit coiling tension control method described above, when the target coiling temperature is not in the range of the coiling temperature measurement points in step (2), the yield strength of the strip at at least two coiling temperature measurement points is re-determined, and then the yield strength of the strip at the target coiling temperature is determined in the manner described above.

[0039] The unit coiling tension control method described above, the given unit coiling tension is as follows:

[0040]

[0041] The unit coiling tension control method described above, the number of coiling temperature measurement points is 5.

[0042] The unit coiling tension control method described above, the yield strength of the strip at the coiling temperature measurement points is as follows:

[0043]

[0044] The technical scheme of the present application has the following beneficial effects:

[0045] Compared with the prior art, the unit coiling tension control method of the present application dynamically changes with the change of the target thickness and coiling temperature of the strip, the accuracy of the unit coiling tension of each steel grade is qualitatively improved, the phenomena of bad coiling shape, steel stacking, and over-flow are basically solved, the coiling tension meets the requirements of coiling rolling, and the economic benefits are obvious. BRIEF DESCRIPTION OF DRAWINGS

[0046] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to be limiting.

[0047] Figure 1 Layout of hot continuous rolling line equipment;

[0048] Figure 2 Schematic diagram of coiling area structure;

[0049] Symbol explanation: 1. heating furnace (4 seats); 2. high-pressure water descaling box; 3. rough rolling vertical roll mill (VE0); 4. rough rolling flat roll mill (R0); 5. heat preservation cover; 6. drum-type tail cutting flying shear; 7. finishing mill stand (7 stands); 8. crown gauge; 9. width gauge; 10. thickness gauge; 11. flatness gauge; 12. coiler. DETAILED DESCRIPTION

[0050] In order to fully understand the purposes, features and effects of the present application, the following specific embodiments are used to make a detailed description of the present application. The process method of the present application uses conventional methods or devices in the art except for the following content. The following terms have the meanings commonly understood by those skilled in the art unless otherwise specified.

[0051] The overall technical solution of the present application is to realize the automatic calculation of unit coiling tension by a control method when the thickness and coiling temperature change, so as to realize the accurate control of unit coiling tension and meet the coiling control requirements to the greatest extent.

[0052] The control system of hot continuous rolling adopts two-level computer control, i.e. process control computer (L2 computer) control and basic automation computer (L1) control. The present application mainly aims at the coiling tension control of the coiler set, and the coiling tension control process is as follows:

[0053] S1: calculating the coiling tension by the L2 level computer;

[0054] S2: sending the calculation result of the L2 level computer to the L1 computer SDH module (setting agent module) in the form of a message;

[0055] S3: establishing a communication channel from the SDH to the coiling tension control module;

[0056] S4: reading the message data value and transmitting it to the transmission system control block to execute and control the specific parameters.

[0057] The main content of the present application is first to creatively improve the control method of the L2 computer for unit coiling tension calculation.

[0058] The control method of the coiling tension before the implementation of the present application is that the coiling unit tension is mainly given according to experience, that is, the unit coiling tension value in different ranges is given by the process personnel according to the steel grade, thickness and width range, and the specific given value is shown in Table 1.

[0059] Table 1 Unit coiling tension before the implementation of the present application

[0060]

[0061] Note: [a, b) in the table means "a≤index

[0062] Through a large number of corresponding analysis on the same unit tension in the given thickness range combined with the coiling shape state, it is found that the thickness and coiling temperature are the most important factors affecting the accuracy of the coiling tension, and when the thickness and coiling temperature change, the inadaptation of the coiling tension is very prominent, which leads to frequent occurrence of phenomena such as poor coiling shape, steel stacking and over-flowing.

[0063] The present application mainly aims at the inadaptation of the coiling tension when the steel strip thickness and coiling temperature change, and invents a coiling tension control method, and the core technical scheme thereof is to invent a unit coiling tension control method through the yield strength at different coiling temperatures and the thickness change, which comprises:

[0064] (1) determining the given unit coiling tension of the steel strip according to experience and on-site debugging;

[0065] (2) obtaining the yield strength of the steel strip at at least two coiling temperature measurement points through experiments;

[0066] (3) calculating the yield strength of the steel strip at the coiling target temperature by using the interpolation method;

[0067] (4) determining the final unit coiling tension according to the yield strength at the coiling target temperature, the target thickness and the given unit coiling tension.

[0068] Among them, the calculation method of the unit coiling tension is as follows:

[0069] cten = cten_g × (yield / yield T )×( h T / h+0.2)(2)

[0070] In the formula, cten is the unit coiling tension, N / mm 2 ;

[0071] cten_g is the given unit coiling tension, N / mm 2 ;

[0072] yield is yield strength at coiling target temperature, N / mm 2 ;

[0073] yield T is reference yield strength, take a fixed value of 150 N / mm 2 ;

[0074] hT is reference thickness, take a fixed value of 2.0mm;

[0075] h is target thickness of strip steel, mm.

[0076] The given unit coiling tension cten_g under the control method of the new invention is re-determined according to experience and on-site debugging, as shown in Table 2.

[0077] Table 2 Given unit coiling tension

[0078]

[0079] Note: [a, b) in the table means "a≤index<b", such as [3.0, 5.0) means "3.0≤thickness<5.0".

[0080] The yield strength of each steel grade at each temperature is obtained by testing, and the yield strength of each classified steel grade (each steel grade classification is tested by taking the most typical steel grade as the standard) at each temperature is shown in Table 3 (the yield strength of five temperature measurement points of each steel grade is measured).

[0081] Table 3 Yield strength value at each coiling temperature

[0082] (Temperature unit: ℃; Yield strength unit: N / mm 2 )

[0083]

[0084] Note: The coiling temperature of a certain steel classification is represented as T(1), T(2), T(3), T(4), T(5) from low to high in Table 3; and the corresponding yield strength is represented as yield(1), yield(2), yield(3), yield(4), yield(5).

[0085] According to the data in Table 3, the yield strength at each coiling target temperature is calculated by using interpolation method, and the specific method is as follows.

[0086] The coiling target temperature of the strip steel is represented as T, and the yield strength at this temperature is represented as yield. The calculation process is as follows:

[0087] Process 1: Determine whether T is in the range of T(l)≤T≤T(5). If it is out of the range, the temperature yield value must be re-determined by test and the temperature points T(l) or T(5) and the corresponding yield strength value in Table 3 above must be modified.

[0088] Process 2: If T=T(i) (i=l,2,3,4,5), then yield is determined as follows.

[0089] yield=yield(i)(3)

[0090] For example, if T=T(l), then yield=yield(l).

[0091] Process 3: If T(i)<T<T(i+1) (i=l,2,3,4,5), then yield is in accordance with the following equation:

[0092] [yield-yield(i)] / [T- T(i)]= [yield(i+1)-yield(i)] / [T(i+1)- T(i)](4)

[0093] According to the above equation, yield can be derived as follows:

[0094] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)(5)

[0095] For example, if T is between T(l) and T(2), then according to equation (5), we have:

[0096] yield = [yield(2)-yield(l)] / [T(2)- T(l)]× [T- T(l)]+ yield(l)

[0097] As can be seen from equation (2), since yield T and h T are fixed values, when the coiling temperature and the strip thickness change, the unit coiling tension also changes dynamically. The lower the coiling temperature and the greater the yield strength yield, the greater the unit coiling tension. The thinner the target thickness of the strip, the greater the unit coiling tension.

[0098] In the production process, for each piece of strip rolling, the determination of the unit coiling tension includes the following steps:

[0099] Step 1: According to the steel grade, thickness, and width, the given unit coiling tension cten_g is obtained according to Table 2.

[0100] Step 2: According to the steel grade, the target coiling temperature, and according to Table 3 and the yield strength yield calculation process 1-3, the yield strength yield is obtained;

[0101] Step 3: The final unit coiling tension cten is obtained according to formula (2).

[0102] Compared with the prior art, the unit coiling tension dynamically changes with the change of the target thickness of the strip steel and the coiling temperature, and after continuous debugging, the accuracy of the unit coiling tension of each steel grade is qualitatively improved, meeting the demand of coiling quality.

[0103] Embodiment

[0104] The application will be further described by way of examples, but the application is not limited to the scope of the examples. The experimental methods in the following examples are not specified, and the conventional methods and conditions are used.

[0105] Embodiment 1:

[0106] This embodiment is to roll soft material steel, and the steel coil number is 92A010301, the steel grade is SPHC; the billet thickness is 200 mm, and the billet width is 1270 mm; the target thickness of the finished strip steel is 1.5 mm, the target width is 1250 mm; and the target coiling temperature is 620℃.

[0107] The unit coiling tension is determined by the following steps:

[0108] Step 1: According to the steel grade, the thickness, and the width, the given unit coiling tension cten_g is 7.1 N / mm obtained by referring to Table 2. 2 .

[0109] Step 2: According to the steel grade and the target coiling temperature, refer to Table 3 to obtain:

[0110] The temperature T is between T(2) and T(3), wherein T(2)=525, T(3)=625; yield(2)=300, yield(3)=265. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0111] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0112] = [yield(3)-yield(2)] / [T(3)- T(2)]× [T- T(2)]+ yield(2)

[0113] = (265 - 300) / (625 - 525) x (620 - 525) + 300

[0114] = 266.75 (N / mm 2 )

[0115] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0116] cten = cten_g x (yield / yield T ) x (h T / h + 0.2)

[0117] = 7.1 x (266.75 / 150) x (2.0 / 1.5 + 0.2)

[0118] = 19.36 (N / mm 2 )

[0119] During the rolling process, the coiling quality is stable, and there are no bad coil shape, steel stacking, and over-flow phenomena, and the coiling tension meets the requirements of coiling rolling.

[0120] Example 2:

[0121] This example rolls soft material steel, steel roll number: 92A010202, steel type: SPHC; billet thickness 200 mm, billet width 1270 mm; target thickness of finished strip steel 3.75 mm, target width 1250 mm; coiling target temperature 600°C.

[0122] The unit coiling tension is determined by the following steps:

[0123] Step 1: According to the steel type, thickness, and width, Table 2 is consulted to obtain the given unit coiling tension cten_g as 6.8 N / mm 2 .

[0124] Step 2: According to the steel type and the coiling target temperature, Table 3 is consulted to obtain:

[0125] The temperature T is between T(2) and T(3), where T(2) = 525, T(3) = 625; yield(2) = 300, yield(3) = 265. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0126] yield = [yield(i+1) - yield(i)] / [T(i+1) - T(i)] x [T - T(i)] + yield(i)

[0127] = [yield(3)-yield(2)] / [T(3)- T(2)]x [T- T(2)]+ yield(2)

[0128] = (265-300) / (625-525)x (600-525)+300

[0129] = 273.75 (N / mm 2 )

[0130] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0131] cten = cten_g x (yield / yield T ) x (h T / h+0.2)

[0132] = 6.8 x (273.75 / 150) x (2.0 / 3.75+0.2)

[0133] = 9.1 (N / mm 2 )

[0134] During the rolling process, the coiling quality is stable, there is no coil shape defect, steel stacking, over flow and other phenomena, and the coiling tension meets the requirements of coiling rolling.

[0135] Example 3:

[0136] This example rolls soft material steel, steel roll number: 92A020701, steel type: Q195L; blank thickness 200mm, blank width 1250mm; target thickness of finished strip steel 6.0mm, target width 1220mm; coiling target temperature 625℃.

[0137] The unit coiling tension is determined by the following steps:

[0138] Step 1: According to the steel type, thickness and width, the given unit coiling tension cten_g is obtained from table 2 as 6.7 N / mm 2 .

[0139] Step 2: According to the steel type and the coiling target temperature, table 3 is consulted to obtain:

[0140] The temperature T = T(3) = 625, according to formula (3), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0141] yield = yield(3) = 265 (N / mm 2 )

[0142] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0143] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0144] =6.8×(265 / 150)×(2.0 / 6.7+0.2)

[0145] =5.99(N / mm 2 )

[0146] Rolling process winding quality is stable, no coil shape bad, stack steel, over flow and other phenomena, winding tension to meet the winding rolling requirements.

[0147] Example 4:

[0148] The rolling soft material steel, steel number: 92A010202, steel: Q195LD; blank thickness 200mm, blank width 1230mm; target thickness of finished strip steel 8.0mm, target width 1200mm; winding target temperature 550℃.

[0149] The unit winding tension is determined by the following steps:

[0150] Step 1: according to the steel grade, thickness, width, look up table 2 to get the given unit winding tension cten_g is 6.6N / mm 2 .

[0151] Step 2: according to the steel grade, winding target temperature, look up table 3:

[0152] The temperature T is between T(2) and T(3), wherein T(2)=525, T(3)=625; yield(2)=300, yield(3)=265. According to formula (5), the yield strength yield of the strip steel at the winding temperature is obtained:

[0153] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0154] = [yield(3)-yield(2)] / [T(3)- T(2)]× [T- T(2)]+ yield(2)

[0155] =(265-300) / (625-525)×(550-525)+300

[0156] =291.25 (N / mm 2 )

[0157] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0158] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0159] =6.8×(291.25 / 150)×(2.0 / 8.0+0.2)

[0160] =5.94(N / mm 2 )

[0161] The coiling quality is stable during rolling, and there are no bad coil shape, steel stacking, and over flow, etc. The coiling tension meets the requirements of coiling rolling.

[0162] Example 5:

[0163] The ordinary carbon steel is rolled in this example, the steel coil number is 92B021301, the steel grade is Q235A, the blank thickness is 200 mm, the blank width is 1300 mm, the target thickness of the finished strip steel is 1.95 mm, the target width is 1250 mm, and the coiling target temperature is 620℃.

[0164] The unit coiling tension is determined by the following steps:

[0165] Step 1: According to the steel grade, thickness, and width, the given unit coiling tension cten_g is obtained as 9.1 N / mm 2 from Table 2.

[0166] Step 2: According to the steel grade and the coiling target temperature, the following is obtained from Table 3:

[0167] The temperature T is between T(2) and T(3), wherein T(2)=525, T(3)=625; yield(2)=320, yield(3)=280. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0168] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0169] = [yield(3)-yield(2)] / [T(3)- T(2)]× [T- T(2)]+ yield(2)

[0170] =(280-320) / (625-525)×(620-525)+320

[0171] = 282 (N / mm 2 )

[0172] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0173] cten = cten_g x (yield / yield T ) x (h T / h + 0.2)

[0174] = 9.1 x (282 / 150) x (2.0 / 1.95 + 0.2)

[0175] = 20.96 (N / mm 2 )

[0176] During rolling, the coiling quality is stable, and there are no bad coil shape, steel stacking, over flow and other phenomena, and the coiling tension meets the requirements of coiling rolling.

[0177] Example 6:

[0178] This example rolls ordinary carbon steel, the steel coil number is 92B021503, the steel grade is Q235C; the blank thickness is 200 mm, the blank width is 1300 mm; the target thickness of the finished strip steel is 3.0 mm, and the target width is 1250 mm; the coiling target temperature is 600℃.

[0179] The unit coiling tension is determined by the following steps:

[0180] Step 1: According to the steel grade, thickness and width, the given unit coiling tension cten_g is 9.2 N / mm 2 from Table 2.

[0181] Step 2: According to the steel grade and the coiling target temperature, Table 3 is searched to obtain:

[0182] The temperature T is between T(2) and T(3), wherein T(2)=525, T(3)=625; yield(2)=320, yield(3)=280. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0183] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)] x [T- T(i)]+ yield(i)

[0184] = [yield(3)-yield(2)] / [T(3)- T(2)] x [T- T(2)]+ yield(2)

[0185] = (280 - 320) / (625 - 525) x (600 - 525) + 320

[0186] = 290 (N / mm 2 )

[0187] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0188] cten = cten_g x (yield / yield T ) x (h T / h + 0.2)

[0189] = 9.2 x (290 / 150) x (2.0 / 3.0 + 0.2)

[0190] = 15.41 (N / mm 2 )

[0191] During the rolling process, the coiling quality is stable, and there are no bad coil shape, steel stacking, and over-flow phenomena, and the coiling tension meets the requirements of coiling rolling.

[0192] Example 7:

[0193] This example rolls ordinary carbon steel, the steel coil number is 92B021601, the steel grade is Q235AG; the blank thickness is 200 mm, the blank width is 1300 mm; the target thickness of the finished strip steel is 7.9 mm, the target width is 1250 mm; the coiling target temperature is 580℃.

[0194] The unit coiling tension is determined by the following steps:

[0195] Step 1: According to the steel grade, thickness, and width, Table 2 is consulted to obtain the given unit coiling tension cten_g as 8.5 N / mm 2 .

[0196] Step 2: According to the steel grade and the coiling target temperature, Table 3 is consulted to obtain:

[0197] The temperature T is between T(2) and T(3), where T(2)=525, T(3)=625; yield(2)=320, yield(3)=280. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0198] yield = [yield(i+1) - yield(i)] / [T(i+1) - T(i)] x [T - T(i)] + yield(i)

[0199] = [yield(3)-yield(2)] / [T(3)- T(2)]x [T- T(2)]+ yield(2)

[0200] = (280-320) / (625-525)x(580-525)+320

[0201] = 298 (N / mm 2 )

[0202] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0203] cten = cten_g x (yield / yield T ) x (h T / h+0.2)

[0204] = 8.5 x (298 / 150) x (2.0 / 7.9+0.2)

[0205] = 7.65 (N / mm 2 )

[0206] During the rolling process, the coiling quality is stable, and there are no bad coil shapes, steel stacking, and overflows, and the coiling tension meets the requirements of coiling rolling.

[0207] Example 8:

[0208] This example rolls high-strength steel, the steel roll number is 92C030101, the steel grade is TQ700MCD, the billet thickness is 200 mm, the billet width is 1000 mm, the target thickness of the finished strip steel is 1.9 mm, and the target width is 990 mm; the coiling target temperature is 550℃.

[0209] The unit coiling tension is determined by the following steps:

[0210] Step 1: According to the steel grade, thickness, and width, Table 2 is consulted to obtain the given unit coiling tension cten_g of 10.5 N / mm 2 .

[0211] Step 2: According to the steel grade and the coiling target temperature, Table 3 is consulted to obtain:

[0212] The temperature T is between T(3) and T(4), wherein T(3)=500, T(4)=600; yield(3)=385.5, yield(4)=302. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0213] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]x [T- T(i)]+ yield(i)

[0214] = [yield(4)-yield(3)] / [T(4)- T(3)]x [T- T(3)]+ yield(3)

[0215] =(302-385.5) / (600-500)x(550-500)+385.5

[0216] =343.75 (N / mm 2 )

[0217] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0218] cten = cten_g x (yield / yield T ) x (h T / h+0.2)

[0219] =10.5 x (343.75 / 150) x (2.0 / 1.9+0.2)

[0220] =30.14 (N / mm 2 )

[0221] During the rolling process, the coiling quality is stable, there is no coil shape defect, steel stacking, over flow and other phenomena, and the coiling tension meets the requirements of coiling rolling.

[0222] Example 9:

[0223] In this example, high-strength steel is rolled, the steel roll number is 92C045201, the steel grade is TQ700MCD, the billet thickness is 200 mm, the billet width is 1210 mm, the target thickness of the finished strip steel is 1.9 mm, and the target width is 1200 mm; the coiling target temperature is 550℃.

[0224] The unit coiling tension is determined by the following steps:

[0225] Step 1: According to the steel grade, thickness and width, the given unit coiling tension cten_g is obtained from Table 2 as 9.8 N / mm 2 .

[0226] Step 2: According to the steel grade and the coiling target temperature, Table 3 is referred to obtain:

[0227] The temperature T is between T(3) and T(4), where T(3) = 500°C and T(4) = 600°C; yield(3) = 385.5 and yield(4) = 302. According to formula (5), the yield strength yield of this strip at the coiling temperature is calculated as follows:

[0228] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0229] = [yield(4)-yield(3)] / [T(4)- T(3)]× [T- T(3)]+ yield(3)

[0230] =(302-385.5) / (600-500)×(550-500)+385.5

[0231] =343.75 (N / mm 2 )

[0232] Step 3: Calculate the final unit winding tension cten according to formula (2):

[0233] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0234] =9.8×(343.75 / 150)×(2.0 / 1.9+0.2)

[0235] =28.13 (N / mm) 2 )

[0236] The coiling quality is stable during the rolling process, with no poor coil shape, steel piling, or overflow. The coiling tension meets the requirements for coiling and rolling.

[0237] Example 10:

[0238] This embodiment rolls high-strength steel with coil number 92C045501 and steel grade TJB32; billet thickness 200mm and billet width 1220mm; finished strip thickness 3.4mm and target width 1200mm; and coiling target temperature 700℃.

[0239] Determine the unit take-up tension using the following steps:

[0240] Step 1: Based on the steel type, thickness, and width, refer to Table 2 to obtain the coiling tension cten_g for a given unit as 9.7 N / mm. 2 .

[0241] Step 2: According to the steel grade and the target coiling temperature, Table 3 is consulted to obtain:

[0242] The temperature T = T(5) = 700; according to formula (3), the yield strength yield of the strip at the coiling temperature is obtained:

[0243] yield = yield(5) = 252.5 (N / mm 2 )

[0244] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0245] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0246] = 9.7 × (252.5 / 150) × (2.0 / 3.4 + 0.2)

[0247] = 12.87 (N / mm 2 )

[0248] During rolling, the coiling quality is stable, there is no bad coil shape, steel stacking, and over-flow phenomenon, and the coiling tension meets the requirements of coiling rolling.

[0249] Example 11:

[0250] In this example, high-strength steel is rolled, the steel coil number is 92C078901, the steel grade is TQ600; the billet thickness is 200 mm, and the billet width is 1210 mm; the target thickness of the finished strip is 5.9 mm, the target width is 1200 mm; and the target coiling temperature is 570℃.

[0251] The unit coiling tension is determined by the following steps:

[0252] Step 1: According to the steel grade, thickness, and width, Table 2 is consulted to obtain the given unit coiling tension cten_g as 9.6 N / mm 2 .

[0253] Step 2: According to the steel grade and the target coiling temperature, Table 3 is consulted to obtain:

[0254] The temperature T is between T(3) and T(4), where T(3) = 500 and T(4) = 600; yield(3) = 385.5 and yield(4) = 302. According to formula (5), the yield strength yield of the strip at the coiling temperature is obtained:

[0255] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]x [T- T(i)]+ yield(i)

[0256] = [yield(4)-yield(3)] / [T(4)- T(3)]x [T- T(3)]+ yield(3)

[0257] =(302-385.5) / (600-500)x(570-500)+385.5

[0258] =327.05 (N / mm 2 )

[0259] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0260] cten = cten_g x (yield / yield T ) x (h T / h+0.2)

[0261] =9.6x(327.05 / 150)x(2.0 / 5.9+0.2)

[0262] =11.28 (N / mm 2 )

[0263] During the rolling process, the coiling quality is stable, there is no coil shape defect, steel stacking, over flow and other phenomena, and the coiling tension meets the requirements of coiling rolling.

[0264] Example 12:

[0265] This example rolls CR stainless steel, steel roll number: 92C710801, steel type: 430; blank thickness 200 mm, blank width 1243 mm; target thickness of finished strip steel 2.85 mm, target width 1240 mm; coiling target temperature 680℃.

[0266] The unit coiling tension is determined by the following steps:

[0267] Step 1: According to the steel type, thickness and width, the given unit coiling tension cten_g is obtained from Table 2 as 4.3 N / mm 2 .

[0268] Step 2: According to the steel type and the coiling target temperature, Table 3 is consulted to obtain:

[0269] The temperature T is between T(3) and T(4), where T(3) = 625°C and T(4) = 725°C; yield(3) = 766°C and yield(4) = 577°C. According to formula (5), the yield strength yield of this strip at the coiling temperature is calculated as follows:

[0270] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0271] = [yield(4)-yield(3)] / [T(4)- T(3)]× [T- T(3)]+ yield(3)

[0272] =(577-766) / (725-625)×(680-625)+766

[0273] =662.05 (N / mm 2 )

[0274] Step 3: Calculate the final unit winding tension cten according to formula (2):

[0275] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0276] =4.3×(662.05 / 150)×(2.0 / 2.85+0.2)

[0277] =17.11 (N / mm) 2 )

[0278] The coiling quality is stable during the rolling process, with no poor coil shape, steel piling, or overflow. The coiling tension meets the requirements for coiling and rolling.

[0279] Example 13:

[0280] This embodiment involves rolling CR stainless steel, with coil number 92C705002 and steel grade 430R; billet thickness 200mm and billet width 1243mm; target strip thickness 4.1mm and target width 1240mm; and target coiling temperature 730℃.

[0281] Determine the unit take-up tension using the following steps:

[0282] Step 1: Based on the steel type, thickness, and width, refer to Table 2 to obtain the coiling tension cten_g for a given unit as 4.2 N / mm. 2 .

[0283] Step 2: According to the steel grade and coiling target temperature, Table 3 is consulted:

[0284] The temperature T is between T(4) and T(5), wherein T(4) = 725, T(5) = 800; yield(4) = 577, yield(5) = 340. According to formula (5), the yield strength yield of the strip at the coiling temperature is obtained:

[0285] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]x [T- T(i)]+ yield(i)

[0286] = [yield(5)-yield(4)] / [T(5)- T(4)]x [T- T(4)]+ yield(4)

[0287] = (340-577) / (800-725)x (730-725)+577

[0288] = 561.2 (N / mm 2 )

[0289] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0290] cten = cten_g x (yield / yield T ) x (h T / h+0.2)

[0291] = 4.2 x (561.2 / 150) x (2.0 / 4.1+0.2)

[0292] = 10.81 (N / mm 2 )

[0293] During rolling, the coiling quality is stable, there is no coil shape defect, steel stacking, and over flow phenomenon, and the coiling tension meets the requirements of coiling rolling.

[0294] Example 14:

[0295] In this example, CR stainless steel is rolled, the steel coil number is 92C728001, the steel grade is SUH409L; the billet thickness is 200 mm, the billet width is 1278 mm; the target thickness of the finished strip is 5.43 mm, the target width is 1293 mm; the coiling target temperature is 650℃.

[0296] The unit coiling tension is determined by the following steps:

[0297] Step 1: According to the steel grade, thickness, width, look up Table 2 to get the given unit coiling tension cten_g = 4.2 N / mm 2 .

[0298] Step 2: According to the steel grade, coiling target temperature, look up Table 3 to get:

[0299] The temperature T is between T(3) and T(4), wherein T(3) = 625, T(4) = 725; yield(3) = 766, yield(4) = 577. According to formula (5), the yield strength yield of the strip at the coiling temperature is obtained:

[0300] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0301] = [yield(4)-yield(3)] / [T(4)- T(3)]× [T- T(3)]+ yield(3)

[0302] = (577-766) / (725-625)×(650-625)+766

[0303] = 718.75 (N / mm 2 )

[0304] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0305] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0306] = 4.2×(718.75 / 150)×(2.0 / 5.43+0.2)

[0307] = 11.44 (N / mm 2 )

[0308] During the rolling process, the coiling quality is stable, there is no coil shape defect, steel stacking, over flow and other phenomena, and the coiling tension meets the requirements of coiling rolling.

[0309] Example 15:

[0310] This example rolls NI stainless steel, coil number: 92C728001, steel grade: SUS304; blank thickness 200 mm, blank width 945 mm; target thickness of finished strip 2.85 mm, target width 959 mm; coiling target temperature 780℃.

[0311] The unit coiling tension is determined by the following steps:

[0312] Step 1: According to the steel grade, thickness, and width, the given unit coiling tension cten_g is obtained from Table 2 as 10.8 N / mm 2 .

[0313] Step 2: According to the steel grade and the coiling target temperature, Table 3 is consulted to obtain:

[0314] The temperature T is between T(4) and T(5), where T(4) = 725, T(5) = 800; yield(4) = 617, yield(5) = 370. According to formula (5), the yield strength yield of the current strip at the coiling temperature is obtained:

[0315] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0316] = [yield(5)-yield(4)] / [T(5)- T(4)]× [T- T(4)]+ yield(4)

[0317] =(370-617) / (800-725)×(780-725)+617

[0318] =435.87(N / mm 2 )

[0319] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0320] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0321] =10.8×(435.87 / 150)×(2.0 / 2.85+0.2)

[0322] =28.29(N / mm 2 )

[0323] During rolling, the coiling quality is stable, there are no coil shape defects, steel stacking, and over-flowing phenomena, and the coiling tension meets the requirements of coiling rolling.

[0324] Example 16:

[0325] This example rolled a stainless steel, steel roll number: 92C714201, steel grade: SUS304; billet thickness 200 mm, billet width 1245 mm; target finished strip thickness 2.85 mm, target width 1259 mm; coiling target temperature 780°C.

[0326] The unit coiling tension was determined by the following steps:

[0327] Step 1 : According to the steel grade, thickness, and width, look up Table 2 to obtain the given unit coiling tension cten_g as 10.0 N / mm 2 .

[0328] Step 2: According to the steel grade and coiling target temperature, look up Table 3 to obtain:

[0329] This temperature T is between T(4) and T(5), where T(4) = 725, T(5) = 800; yield(4) = 617, yield(5) = 370. According to formula (5), the yield strength yield of the present strip at the coiling temperature is obtained as:

[0330] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0331] = [yield(5)-yield(4)] / [T(5)- T(4)]× [T- T(4)]+ yield(4)

[0332] = (370-617) / (800-725)×(780-725)+617

[0333] = 435.87 (N / mm 2 )

[0334] Step 3: According to formula (2), the final unit coiling tension cten is obtained as:

[0335] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0336] = 10.0×(435.87 / 150)×(2.0 / 2.95+0.2)

[0337] = 25.51 (N / mm 2 )

[0338] During rolling, the coiling quality was stable, and there were no phenomena such as bad coil shape, steel stacking, and over flow, and the coiling tension met the requirements of coiling rolling.

[0339] Example 17:

[0340] This example rolled a NI stainless steel, steel coil number: 931694401, steel grade: 022CR19NI; billet thickness 200mm, billet width 1245mm; target thickness of finished strip 4.58mm, target width 1259mm; target coiling temperature 720°C.

[0341] The unit coiling tension was determined by the following steps:

[0342] Step 1 : According to the steel grade, thickness, width, look up table 2 to get the given unit coiling tension cten_g as 8.8 N / mm 2 .

[0343] Step 2: According to the steel grade, target coiling temperature, look up table 3 to get:

[0344] This temperature T is between T(3) and T(4), where T(3)=625, T(4)=725; yield(3)=806, yield(3)=617. According to formula (5), the yield strength of this piece of strip at the coiling temperature is calculated as:

[0345] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0346] = [yield(4)-yield(3)] / [T(4)- T(3)]× [T- T(3)]+ yield(3)

[0347] =(617-806) / (725-625)×(720-625)+806

[0348] =626.45(N / mm 2 )

[0349] Step 3: According to formula (2), the final unit coiling tension cten is calculated as:

[0350] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0351] =8.8×(626.45 / 150)×(2.0 / 4.58+0.2)

[0352] =23.40(N / mm 2 )

[0353] The coiling quality is stable during rolling, and there are no phenomena such as coil shape defects, steel stacking, and over flow, and the coiling tension meets the requirements of coiling rolling.

[0354] Example 18:

[0355] In this example, the NI stainless steel is rolled, the steel roll number is 931636701, the steel grade is 1.4307; the blank thickness is 200 mm, the blank width is 1025 mm; the target thickness of the finished strip steel is 6.97 mm, and the target width is 1035 mm; the coiling target temperature is 720℃.

[0356] The unit coiling tension is determined by the following steps:

[0357] Step 1: According to the steel grade, thickness, and width, Table 2 is consulted to obtain the given unit coiling tension cten_g as 8.6 N / mm 2 .

[0358] Step 2: According to the steel grade and the coiling target temperature, Table 3 is consulted to obtain:

[0359] The temperature T is between T(3) and T(4), where T(3)=625, T(4)=725; yield(3)=806, yield(3)=617. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0360] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0361] = [yield(4)-yield(3)] / [T(4)- T(3)]× [T- T(3)]+ yield(3)

[0362] =(617-806) / (725-625)×(720-625)+806

[0363] =626.45(N / mm 2 )

[0364] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0365] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0366] =8.6×(626.45 / 150)×(2.0 / 6.97+0.2)

[0367] = 17.49 (N / mm 2 )

[0368] The coiling quality is stable during rolling, and there are no coil shape defects, steel stacking, and over flow, etc. The coiling tension meets the requirements of coiling rolling.

[0369] Example 19:

[0370] This example rolls low-grade silicon steel, and the steel coil number is 92C527301, and the steel grade is DW60A. The billet thickness is 200 mm, and the billet width is 1300 mm. The target thickness of the finished strip steel is 2.6 mm, and the target width is 1295 mm. The coiling target temperature is 650°C.

[0371] The unit coiling tension is determined by the following steps:

[0372] Step 1: According to the steel grade, thickness, and width, Table 2 is consulted to obtain the given unit coiling tension cten_g as 19.0 N / mm 2 .

[0373] Step 2: According to the steel grade and the coiling target temperature, Table 3 is consulted to obtain:

[0374] The temperature T is between T(4) and T(5), where T(4)=600, T(5)=750; yield(4)=150, yield(5)=125. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0375] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)]× [T- T(i)]+ yield(i)

[0376] = [yield(5)-yield(4)] / [T(5)- T(4)]× [T- T(4)]+ yield(4)

[0377] =(125-150) / (750-600)×(650-600)+150

[0378] = 141.67 (N / mm 2 )

[0379] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0380] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0381] = 19.0 x (141.67 / 150) x (2.0 / 2.6 + 0.2)

[0382] = 17.39 (N / mm 2 )

[0383] The coiling quality is stable during rolling, and there are no coil shape defects, steel stacking, and over-flowing, etc. The coiling tension meets the requirements of coiling rolling.

[0384] Example 20:

[0385] This example rolls high-grade silicon steel, with the steel coil number: 92C434501, and the steel grade: DW25; the billet thickness: 222 mm, and the billet width: 1155 mm; the target thickness of the finished strip steel: 2.2 mm, and the target width: 1150 mm; the coiling target temperature: 650℃.

[0386] The unit coiling tension is determined by the following steps:

[0387] Step 1: According to the steel grade, thickness, and width, Table 2 is consulted to obtain the given unit coiling tension cten_g as 18.3 N / mm 2 .

[0388] Step 2: According to the steel grade and the coiling target temperature, Table 3 is consulted to obtain:

[0389] The temperature T is between T(4) and T(5), where T(4)=600, T(5)=750; yield(4)=170, yield(5)=150. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0390] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)] x [T- T(i)]+ yield(i)

[0391] = [yield(5)-yield(4)] / [T(5)- T(4)] x [T- T(4)]+ yield(4)

[0392] = (150-170) / (750-600) x (650-600)+170

[0393] = 163.33 (N / mm 2 )

[0394] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0395] cten = cten_g x (yield / yieldT ) x ( h T / h + 0.2)

[0396] = 18.3 x (163.33 / 150) x (2.0 / 2.2 + 0.2)

[0397] = 22.1 (N / mm 2 )

[0398] The coiling quality is stable during the rolling process, and there are no coil shape defects, steel stacking, and over-flowing phenomena, and the coiling tension meets the requirements of the coiling rolling.

[0399] Example 21:

[0400] This example rolls high-grade silicon steel, and the steel coil number is 92C444801, and the steel grade is DV19A; the billet thickness is 222 mm, and the billet width is 1235 mm; the target thickness of the finished strip steel is 2.3 mm, and the target width is 1230 mm; the coiling target temperature is 650°C.

[0401] The unit coiling tension is determined by the following steps:

[0402] Step 1: According to the steel grade, thickness, and width, Table 2 is consulted to obtain the given unit coiling tension cten_g as 17.2 N / mm 2 .

[0403] Step 2: According to the steel grade and the coiling target temperature, Table 3 is consulted to obtain:

[0404] The temperature T is between T(4) and T(5), where T(4)=600, T(5)=750; yield(4)=170, yield(5)=150. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0405] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)] x [T- T(i)]+ yield(i)

[0406] = [yield(5)-yield(4)] / [T(5)- T(4)] x [T- T(4)]+ yield(4)

[0407] = (150-170) / (750-600) x (650-600)+170

[0408] = 163.33 (N / mm 2 )

[0409] Step 3: According to formula (2), the final unit coiling tension cten is obtained:

[0410] cten = cten_g x (yield / yield T ) x (h T / h + 0.2)

[0411] = 17.2 x (163.33 / 150) x (2.0 / 2.3 + 0.2)

[0412] = 20.03 (N / mm 2 )

[0413] The coiling quality is stable during the rolling process, and there are no coil shape defects, steel stacking, and overflows, and the coiling tension meets the requirements of the coiling rolling.

[0414] Example 22:

[0415] This example rolls high-grade silicon steel, and the steel coil number is 92C440301, and the steel grade is DG47A; the blank thickness is 222 mm, and the blank width is 1035 mm; the target thickness of the finished strip steel is 2.6 mm, and the target width is 1030 mm; the coiling target temperature is 650°C.

[0416] The unit coiling tension is determined by the following steps:

[0417] Step 1: According to the steel grade, thickness, and width, Table 2 is consulted to obtain the given unit coiling tension cten_g as 17.0 N / mm 2 .

[0418] Step 2: According to the steel grade and the coiling target temperature, Table 3 is consulted to obtain:

[0419] The temperature T is between T(4) and T(5), where T(4)=600, T(5)=750; yield(4)=170, yield(5)=150. According to formula (5), the yield strength yield of the strip steel at the coiling temperature is obtained:

[0420] yield = [yield(i+1)-yield(i)] / [T(i+1)- T(i)] x [T- T(i)]+ yield(i)

[0421] = [yield(5)-yield(4)] / [T(5)- T(4)] x [T- T(4)]+ yield(4)

[0422] = (150-170) / (750-600) x (650-600)+170

[0423] = 163.33 (N / mm 2 )

[0424] Step 3: according to formula (2), the final unit coiling tension cten is obtained:

[0425] cten = cten_g × (yield / yield T )×( h T / h+0.2)

[0426] =17.0×(163.33 / 150)×(2.0 / 2.6+0.2)

[0427] =17.94(N / mm 2 )

[0428] During the rolling process, the coiling quality is stable, there is no bad coil shape, steel stacking, over flow and other phenomena, and the coiling tension meets the requirements of coiling rolling.

[0429] The application has been disclosed in the foregoing by preferred embodiments, but those skilled in the art should understand that these embodiments are only used to depict the application and should not be understood as limiting the scope of the application. It should be noted that any equivalent changes and substitutions with these embodiments should be considered as covered in the scope of the claims of the application. Therefore, the protection scope of the application should be limited by the scope defined in the claims.

Claims

1. A method for controlling unit winding tension, characterized in that, include: (1) Determine the given unit coiling tension of the strip steel based on experience and on-site debugging; (2) The yield strength of the strip at at least two coiling temperature measurement points was obtained through experiments; (3) Calculate the yield strength of the strip at the target coiling temperature using the interpolation method; (4) Determine the final unit winding tension based on the yield strength at the target winding temperature, the target thickness, and the given unit winding tension; The calculation method for the unit winding tension is as follows: cten = cten_g × (yield / yield T )×( h T / h+0.2) In the formula, cten is the unit winding tension, N / mm 2 ; cten_g is the given unit of winding tension, N / mm. 2 ; `yield` is the yield strength at the target temperature of winding, in N / mm². 2 ; yield T For reference yield strength, N / mm 2 ; h T Reference thickness, mm; h represents the target thickness of the strip, in mm.

2. The method for controlling unit winding tension according to claim 1, characterized in that, The reference yield strength is a fixed value of 150 N / mm. 2 The reference thickness is a fixed value of 2.0 mm.

3. The method for controlling unit winding tension according to claim 1, characterized in that, When the target coiling temperature is equal to a certain coiling temperature measurement point in step (2), the yield strength of the strip at the target coiling temperature is equal to the yield strength at that coiling temperature measurement point.

4. The method for controlling unit winding tension according to claim 1, characterized in that, When the target coiling temperature is between the two coiling temperature measurement points in step (2), the yield strength of the strip at the target coiling temperature conforms to the following equation: [yield-yield(i)] / [T- T(i)] = [yield(i+1)-yield(i)] / [T(i+1)- T(i)] In the formula, yield is the yield strength of the strip at the target coiling temperature, in N / mm². 2 ; yield(i) is the yield strength of the strip at the i-th coiling temperature measurement point, in N / mm². 2 ; T represents the target temperature for strip coiling, in °C; T(i) is the temperature of the strip at the i-th coiling temperature measurement point, in °C; `yield(i+1)` represents the yield strength of the strip at the (i+1)th coiling temperature measurement point, in N / mm². 2 ; T(i+1) is the temperature of the strip at the (i+1)th coiling temperature measurement point, in °C.

5. The method for controlling unit winding tension according to claim 1, characterized in that, When the target coiling temperature is not within the range of the coiling temperature measurement points in step (2), the yield strength of the strip at at least two coiling temperature measurement points is re-measured, and then the yield strength of the strip at the target coiling temperature is determined in accordance with the manner of claim 3 or 4.

6. The method for controlling unit winding tension according to claim 1, characterized in that, The given unit winding tension is taken as follows: 。 7. The method for controlling unit winding tension according to claim 1, characterized in that, The number of winding temperature measurement points is 5.

8. The method for controlling unit winding tension according to claim 7, characterized in that, The yield strength of the strip at the coiling temperature measurement point is as follows: 。

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