CN114535317B - Method for improving wedge-shaped precision of short-process hot-rolled non-oriented silicon steel - Google Patents
Method for improving wedge-shaped precision of short-process hot-rolled non-oriented silicon steel Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/30—Control of flatness or profile during rolling of strip, sheets or plates using roll camber control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
- B21B37/44—Control of flatness or profile during rolling of strip, sheets or plates using heating, lubricating or water-spray cooling of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
- B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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Abstract
A method for improving wedge precision of short-process hot-rolled non-oriented silicon steel comprises the following steps: smelting and pouring into blanks; heating the plate blank; descaling; hot rolling; and (5) performing conventional repair post-working procedures. In the implementation of the invention, the equipment is not required to be modified; the method is suitable for improving rolling wedge indexes of all hot-rolled non-oriented silicon steel; the wedge-shaped out-of-tolerance defect of the non-oriented silicon steel can be effectively reduced, the wedge-shaped precision of the hot rolled silicon steel raw material is obviously improved from 95.0% to more than 97.1%, and the rejection rate is reduced from 0.39% to not more than 0.15%; simple and easy to operate; on the premise of ensuring the wedge-shaped precision of the strip steel, the rolling period is prolonged from 900 tons to 1100 tons, and the roll consumption of the roller is reduced from 0.83kg/t to not more than 0.76kg/t; the same plate difference precision requirement for the thickness of the silicon steel sheet of 7 mu m is improved from the existing 90% to not lower than 93%; the same plate difference requirement for the thickness of the silicon steel sheet is 5 mu m, which is improved from the existing 40% to not less than 80%.
Description
Technical Field
The invention relates to non-oriented silicon steel and a production method thereof, and in particular belongs to a method for improving wedge-shaped precision of short-flow hot-rolled non-oriented silicon steel.
Background
In recent years, with the continuous improvement of the automation level and energy-saving requirements of industrial users, the users put forward higher requirements on the quality of finished silicon steel, and the requirements on the shape accuracy of non-oriented silicon steel plates are becoming severe. In order to cope with the increasing market competition, the CSP can only continuously reduce the cost while meeting the high requirement of the plate shape accuracy, so that the improvement of the plate shape control capability while increasing the unit rolling amount becomes an important development direction of the current production.
The thickness range of the produced steel is as follows: 2.45-2.85mm, the width range is: 1020-1275mm, which mainly comprises the following production processes: desulfur-converter-argon blowing-RH-continuous casting-soaking furnace-finish rolling-layer cooling-coiling-cold rolling.
Because of the technical characteristics of CSP continuous casting and rolling, only a production mode of rolling with the same width can be adopted, the mode production is difficult to realize on-line grinding of rolls, strip steel is easy to form box-shaped abrasion on rolls when rolled at the same position of the rolls for a long time, wedge-shaped control is not facilitated, and meanwhile, roll consumption is increased due to the fact that the roll changing frequency of a working roll is increased.
Through searching, a document named hot rolled strip steel wedge control system and method, application number 201510705769.8, mainly comprises the following steps: step 1, measuring slab tapping temperature data; step 2, calculating the transverse temperature difference of the slab; step 3, judging whether the lateral temperature difference is greater than the allowable value? If not, ending, if yes, entering a step 4; calculating rolling force deviation of two sides of the rolling mill; step 5, calculating the wedge compensation quantity of bouncing and roll gaps at two sides of the rolling mill; and 6, outputting the roll gap wedge compensation quantity. The hot rolled strip steel wedge control system and the method detect the transverse temperature distribution of the plate blank by using the thermometer, pre-compensate the roll gap of the rolling mill, improve wedge rolling and final strip steel wedge, and simultaneously improve the hot rolling stability and strip steel product plate shape quality. The related process related to a method for improving the wedge precision of the short-process hot-rolled non-oriented silicon steel is not related.
Through searching, the application number 201210013427.6 of the document named as a hot rolled strip steel wedge control method is mainly characterized in that the strip steel hot rolling is subjected to wedge integral control from multiple angles, multiple directions and multiple links by adopting multiple modes such as raw material preparation, micro-positive pressure control, roll shape design, roll gap inclination control, high-pressure water nozzle injection angle adjustment, lining plate replacement, measurement and adjustment of the centring degree of a vertical roll and front and rear side guide plates of a rolling mill, and the like, so that the wedge amount of strip steel can be effectively reduced, and the requirement of a high-end product on the wedge amount of the strip steel is met. The related process related to a method for improving the wedge precision of the short-process hot-rolled non-oriented silicon steel is not related.
Through retrieval, the document named 'a method for improving wedge shape of hot continuous rolling strip steel' has application number 202010427800.7, which mainly comprises a horizontal rolling mill, a vertical roll gap adjusting device and a multifunctional thickness gauge; the multifunctional thickness gauge is used for detecting an actual wedge value of a rolled piece at an outlet of the horizontal rolling mill, and converting the obtained actual wedge value into a vertical roll center line offset; the vertical roll gap adjusting device is used for receiving a given vertical roll center line offset, converting the offset into corresponding AWC hydraulic cylinder extension amount and adding the AWC hydraulic cylinder extension amount to the original AWC hydraulic cylinder extension amount; the vertical roll is used for enabling the next rolled piece to enter the horizontal rolling mill for rolling according to the position of the vertical roll after the central line offset is adjusted. The invention utilizes the method of the vertical roll center line deviation to improve the wedge shape of the strip steel, converts the vertical roll center line deviation amount according to the real-time rolled strip steel wedge value, and transversely moves the vertical roll center line before the next strip steel is rolled to control the wedge shape of the strip steel, so that the wedge-shaped qualification rate is greatly improved, and the plate shape control stability is increased. The related process related to a method for improving the wedge precision of the short-process hot-rolled non-oriented silicon steel is not related.
Through retrieval, the application number 201510275691.0 of the document named 'genetic-based automatic strip steel wedge control method' is that firstly, a strip steel actual measurement wedge value is obtained through detection of a detector at the outlet of a rolling mill, and the strip steel actual measurement wedge value is compared with a wedge value threshold value to obtain a wedge deviation value; then selecting a plurality of frames as wedge-shaped control frames, setting efficiency coefficients of the wedge-shaped control frames, and calculating the single-side roll gap adjustment quantity of the frames by combining the wedge-shaped deviation value with the speed and efficiency coefficient of the strip steel in the wedge-shaped control frames. The invention controls the wedge-shaped adjusting quantity of each rack in equal proportion based on the second flow balance principle, can rapidly and effectively control the wedge-shaped of the hot rolled finished product, overcomes the negative effects of single-side waves and the like caused by adjusting the wedge-shaped, and greatly improves the control capability and level of the wedge-shaped in the production process; after the hot rolling production line is put into use, the qualification rate of the wedge-shaped coil number is improved from 40% to more than 65%. The related process related to a method for improving the wedge precision of the short-process hot-rolled non-oriented silicon steel is not related.
According to the search, the document named 'a control method for improving the wedge shape of strip steel in which two-phase zone rolling exists', application number 201910461620.8, a control method for improving the wedge shape of strip steel in which two-phase zone rolling exists, comprises the following steps of (1) adopting a load distribution mode of rolling reduction distribution, increasing the rolling force of a frame F1-F4, reducing the rolling force of a frame F5-F7, and gradually reducing the rolling force of the frame from the frame F1 to the frame F7 under the condition that the convexity of a plate is good; (2) short-stroke control of the guide plate and the vertical roller; (3) Convexity value range is that the convexity value of the strip steel is the difference between the thickness of the center of the strip steel and the average value of the thickness of 40mm at the edge, and the convexity range is selected to be 27-32 mu m. The heating related process related to the method for improving the wedge precision of the short-process hot-rolled non-oriented silicon steel is not related.
According to the method, full-automatic strip convexity (wedge) control is realized by establishing feedback control of working roll bending and roll gap leveling from a head stand to a tail stand finish rolling stand in the hot rolling tandem rolling mill, namely, after the strip wedge is detected by an ASCC model in the rolling process, deviation is obtained by comparing the ASCC model with a target wedge, deviation correction is carried out by utilizing comprehensive operation and control means of the system, and a stepped adjustment method is established, so that response of the feedback control is maximized, the strip wedge and convexity are corrected, good flatness of products is ensured, snaking motion of strip steel in each stand is prevented, the defect that the existing convexity control means is single is overcome, and the relationship between convexity and flatness is comprehensively balanced. The related process related to a method for improving the wedge precision of the short-process hot-rolled non-oriented silicon steel is not related.
The method is characterized by comprising the following steps of 1) judging the effectiveness of a wedge-shaped measured value of a finish rolling outlet strip steel, obtaining actual measurement feedback through filtering and other methods, and obtaining required control deviation after comparison with a reference, wherein the actual measurement feedback is obtained by the method, and the method comprises the following steps of: w, 2) calculation of roll gap deviation values at two sides of an F1 rolling mill, 3) calculation of roll gap deviation values at two sides of an F2 rolling mill, and adjustment of values obtained by real-time memory and tracking according to actual adjustment of roll gaps at two sides of an F2 frame by the same method as the F3 frame, wherein the beneficial effects of the invention are as follows: 1) The method is simple and easy to operate; 2) According to the invention, after Mei Gang and 1780 hot continuous rolling is applied, the wedge control precision is obviously improved, the total wedge index of plus or minus 20 micrometers is improved from the past 50% to the present 90%, and the thin strip steel with the rolling thickness of 2.0mm can be stably put into use, so that the wedge control precision is improved, and the plate shape and rolling stability can be ensured. The related process related to a method for improving the wedge precision of the short-process hot-rolled non-oriented silicon steel is not related.
According to the search, huang Haodong, chen Xianlin, he Anrui and the like, the application number 200510046113.6 is a work roll shape which is characterized in that a tapered curve form is shown as a square curve function of y (x) =a0+a2x2+a4x4 x epsilon 0, le < 0, he >, and the tapered curve form is shown as a coordinate origin, and the rolling instability caused by asymmetric stress of the strip steel due to axial movement of the roll is reduced because of smooth transition between a tapered region and a roll body. The related process related to a method for improving the wedge precision of the short-process hot-rolled non-oriented silicon steel is not related.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for improving the wedge-shaped precision of the short-process rolled non-oriented silicon steel, which can improve the wedge-shaped precision of the short-process rolled non-oriented silicon steel from the average 95.0% to more than 97.1%, reduce the rejection rate from 0.39% to less than 0.15%, and improve the service life of a roller.
Measures for achieving the above object:
a method for improving wedge precision of short-process hot-rolled non-oriented silicon steel comprises the following steps:
1) Smelting and pouring into blanks;
2) Heating the slab according to the heating temperature defined by the prior art of steel grades; in the slab heating stage, the control is performed according to the following steps:
after the slab is run to line a: 3 zone, 6 zone, 8 zone and 9 zone, and 3 zone, 6 zone and 8 zone of B line, the running speed of the slab is controlled between 0.7m/s and 0.9m/s; the internal heat value of the heating furnace is controlled to be 8150-8895KJ/Nm 3 The furnace atmosphere is the mixed gas of blast furnace gas and coke oven gas;
temperature in each section of the common section, the swinging section, the buffer section and the heating section: the furnace temperature of the public section and the swinging section is not lower than 20 ℃ higher than the tapping temperature of the slab; the temperature in the buffer section furnace is higher than the temperature of the swing section by not lower than 20 ℃; the temperature in the heating section furnace is higher than the temperature of the buffer section by 20 ℃ or more;
3) Descaling, controlling the inlet pressure of the descaling water to be 280-300 bar and the outlet pressure to be 300-330 bar; a water baffle is arranged at the descaling water inlet;
4) Hot rolling, seven passes were used during which:
a. controlling the centering deviation of the front shearing guide plate to be less than or equal to 3mm;
b. controlling the centering deviation of the rolling final guide plate to be less than or equal to 3mm;
c. controlling the rolling reduction of the first pass to be 45-50% and the rolling reduction of the second pass to be 50-55%; the rolling reduction of the 3 rd to 6 th passes is conventional, and the rolling reduction of the last pass is 8-9%;
5) And (5) performing conventional repair post-working procedures.
Preferably: the running speed of the slab is 0.7 m/s-0.83 m/s.
Preferably: the heat value in the slab heating furnace is 8205-8750KJ/Nm 3 。
Preferably: the rolling reduction rate of the first pass is controlled to be 47-50%, and the rolling reduction rate of the second pass is controlled to be 52-55%.
The method comprises the following steps: when the working roll is in a CVC roll shape, the equivalent convexity of each pass of working roll is adjusted to be in the following state before rolling: the convexity of the working roll gap of the first pass and the second pass is adjusted to be-0.7-0.9 mm, and the convexity of the working roll gap of the third pass to the seventh pass is adjusted to be-1.0-0.6 mm.
The main process of the invention has the functions and mechanisms that:
the invention controls the tapping temperature of the heating furnace plate blank. The method is characterized in that a furnace A in a soaking furnace comprises a 7-area head part, a 8-area tail part, a 3-area head part, a 6-area head part, a 8-area head part and a 9-area tail part; the head of the B line 3 area, the head of the 6 area and the head of the 8 area are provided with 7 flues and 2 furnace doors, so that the local temperature of the areas is lower, the imbalance phenomenon of the distributed temperature in the furnace is serious, if the slab stays for a long time, the temperature of the slab is uneven, the temperature of the areas with serious negative pressure of the flues and the furnace doors is too low, and the strip steel is easy to deviate in the rolling process, so that the wedge-shaped precision is poor.
The present invention controls the centering deviation of the front shearing guide plate. The front cutting guide plate is the first gateway for slab centering, so that the centering condition of the soaking pit outlet slab can be well reflected, and the centering of the slab can be corrected, for example, the centering condition of the slab is not well corrected before the slab enters a rolling mill if the centering condition of the front cutting guide plate is poor, the deviation phenomenon can be generated in the slab rolling process, and the wedge-shaped precision of the section of the strip steel is poor.
The invention controls the dephosphorization pressure. The iron scale exists on the rear surface of the plate blank out of the heating furnace, the iron scale on the surface of the plate blank is removed through high-pressure water, the rolled finished product can meet the product requirement, heat exchange can be generated between the water and the plate blank when the iron scale is removed, the temperature drop of the plate blank can be different due to the fact that the water pressure is different from the heat exchange quantity of the plate blank, the metal structure phase change of the plate blank cannot be fixed on a plurality of frames in the rolling process of a finishing mill group, the stability of the finishing mill rolling process is further affected, and the strip steel plate shape mutation can be caused to affect the wedge-shaped precision.
The invention controls the equivalent convexity of the roller, because the CVC roller is characterized by realizing continuous convexity-changing rolling, having stronger convexity control capability, experimental data analysis shows that the roller-shape convexity regulating capability is reduced, the roller-shifting travel can be effectively increased, but the convexity control capability of the roller is too small along with different widths of the strip steel, so that the convexity control capability of the wide strip steel and the narrow strip steel is insufficient, if the roller convexity is increased, the roller-shape regulating capability is increased, the problem of convexity control of the wide strip steel can be solved, the roller-shifting travel of the roller is reduced, the uniform abrasion of the roller is not facilitated, wedge-shaped defect easily occurs in the rolling process, the strip steel has a width range of 1020-5 mm because the strip steel has a higher plate shape requirement than that of the common hot rolled strip steel, and the strip steel has a larger width span.
The present invention controls the centering deviation of the rolling mill guide plate. The finish rolling guide and guard device comprises F1-F7 frame guide plates, wherein the rolling mill guide plates are arranged at the inlet side of each rolling mill frame and positioned between an upper housing and a lower housing of a rolling center line, and guide strips into a roll gap and the tail part of strip steel, wherein the F1 front 1 fixed side guide plates and the F2-F7 front 6 width adjustable side guide plates; in the rolling process, the finish rolling guide device plays a role in guiding strip steel in three stages of threading, stable rolling and steel throwing. The deviation of the head and tail of the strip steel is manifested in poor wedge shape on the finished product.
The present invention controls rolling load distribution. The non-oriented silicon steel is softer, the overall load of the frames F1-F7 of the rolling mill is lower, and the front frames F1-F4 of the finishing mill group mainly thin rolled pieces under the condition of ensuring the shape of the plates, for example, the rolling load is too large, the deformation of metal is irregular, and the irregular deformation is inherited to the rear frame to easily generate defects such as poor wedge shape and the like; if the rolling load of the rear-stage frames F1-F4 is too small, the rolling reduction is too small, the bending force cannot compensate the change of the rolling force, the strip steel is easy to generate bilateral wave defects, and the defects such as wedge defects and the like are easy to generate in the process of adjusting the plate shape.
Compared with the prior art, the invention does not need to modify equipment in the implementation; the method is suitable for improving rolling wedge indexes of all hot-rolled non-oriented silicon steel; the wedge-shaped out-of-tolerance defect of the non-oriented silicon steel can be effectively reduced, and the wedge-shaped precision of the hot rolled silicon steel raw material is obviously improved, namely, the average 95.0 percent is improved to more than 97.1 percent, and the rejection rate is reduced to not more than 0.15 percent from 0.39 percent; simple and easy to operate; on the premise of ensuring the wedge-shaped precision of the strip steel, the rolling period is prolonged from 900 tons to 1100 tons, the roller consumption during rolling the silicon steel is obviously reduced, and the roller consumption is reduced from 0.83kg/t to not more than 0.76kg/t; the same plate difference precision requirement for the thickness of the silicon steel sheet of 7 mu m is improved from the existing 90% to not lower than 93%; the same plate difference requirement for the thickness of the silicon steel sheet is 5 mu m is improved from the existing 40 percent to not less than 80 percent,
Detailed Description
The present invention will be described in detail below:
example 1
The non-oriented silicon steel finished product of the embodiment has the steel grade of 50WW1300, the thickness of the strip steel of 2.55mm, the width of the strip steel of 1245mm and the number of rolled blocks of 65 blocks
A method for improving wedge precision of short-process hot-rolled non-oriented silicon steel comprises the following steps:
1) Smelting and pouring into blanks;
2) Heating the slab according to the heating temperature defined by the prior art of steel grades; in the slab heating stage, the control is performed according to the following steps:
after the slab is run to line a: 3 zone, 6 zone, 8 zone and 9 zone, and 3 zone, 6 zone and 8 zone of line B, the running speed of the slab is controlled at 0.9m/s; the internal heat value of the heating furnace is controlled to 8500Kj/Nm 3 The furnace atmosphere is the mixed gas of blast furnace gas and coke oven gas;
temperature in each section of the common section, the swinging section, the buffer section and the heating section: the furnace temperature of the common section and the swinging section is 21 ℃ higher than the tapping temperature of the slab; the temperature in the buffer section furnace is 23 ℃ higher than the temperature in the swing section; the temperature in the heating section is 26 ℃ higher than the temperature in the buffer section;
3) Descaling, and controlling the inlet pressure of the descaling water to be 283bar and the outlet pressure to be 302bar; a water baffle is arranged at the descaling water inlet;
4) Hot rolling, seven passes were used during which:
a. controlling the centering deviation of the front shearing guide plate to be 2.0mm;
b. controlling the centering deviation of a rolling final guide plate to be 2.5mm;
c. controlling the rolling reduction of the first pass to be 48% and the rolling reduction of the second pass to be 51%; the rolling reduction of the 3 rd to 6 th passes is conventional, and the rolling reduction of the last pass is 9%;
equivalent convexity of the roller: the convexity of the roll gap of the working rolls of the first pass and the second pass is-0.7 mm, and the convexity of the roll gap of the working rolls of the third pass to the seventh pass is-1.0 mm;
5) And (5) performing conventional repair post-working procedures.
The detection shows that the average wedge-shaped precision of the strip steel in the embodiment is 97.85%, and the rejection rate caused by lower wedge-shaped precision is 0.04%.
Example 2
The steel grade of the non-oriented silicon steel finished product is 50WW1300, the thickness of strip steel is 2.55mm, the width of strip steel is 1145mm, and the number of rolling blocks is 230;
a method for improving wedge precision of short-process hot-rolled non-oriented silicon steel comprises the following steps:
1) Smelting and pouring into blanks;
2) Heating the slab according to the heating temperature defined by the prior art of steel grades; in the slab heating stage, the control is performed according to the following steps:
after the slab is run to line a: 3 zone, 6 zone, 8 zone and 9 zone, and 3 zone, 6 zone and 8 zone of line B, the running speed of the slab is controlled at 0.7m/s; the internal heat value of the heating furnace is controlled to 8200Kj/Nm 3 The furnace atmosphere is the mixed gas of blast furnace gas and coke oven gas;
temperature in each section of the common section, the swinging section, the buffer section and the heating section: the furnace temperature of the common section and the swinging section is 23 ℃ higher than the tapping temperature of the slab; the temperature in the buffer section furnace is 22 ℃ higher than the temperature of the swing section; the temperature in the heating section is 21 ℃ higher than the temperature in the buffer section;
3) Descaling, controlling the inlet pressure of the descaling water to be 285bar and the outlet pressure to be 305bar; a water baffle is arranged at the descaling water inlet;
4) Hot rolling, seven passes were used during which:
a. controlling the centering deviation of the front shearing guide plate to be 2.5mm;
b. controlling the centering deviation of a rolling final guide plate to be 2,0mm;
c. controlling the rolling reduction of the first pass to be 45% and the rolling reduction of the second pass to be 55%; the rolling reduction of the 3 rd to 6 th passes is conventional, and the rolling reduction of the last pass is 8%;
equivalent convexity of the roller: the convexity of the working roll gap of the first pass and the second pass is-0.55 mm, and the convexity of the working roll gap of the third pass to the seventh pass is-0.8 mm;
5) And (5) performing conventional repair post-working procedures.
The detection shows that the average wedge-shaped precision of the strip steel in the embodiment is 97.83%, and the rejection rate caused by low wedge-shaped precision is 0.07%.
Example 3
The steel grade of the non-oriented silicon steel finished product is 50WW800, the thickness of the strip steel is 2.55mm, the width of the strip steel is 1195mm, and the number of rolling blocks is 330 blocks;
a method for improving wedge precision of short-process hot-rolled non-oriented silicon steel comprises the following steps:
1) Smelting and pouring into blanks;
2) Heating the slab according to the heating temperature defined by the prior art of steel grades; in the slab heating stage, the control is performed according to the following steps:
after the slab is run to line a: 3 zone, 6 zone, 8 zone and 9 zone, and 3 zone, 6 zone and 8 zone of line B, the running speed of the slab is controlled at 0.72m/s; the internal heat value of the heating furnace is controlled at 8309Kj/Nm 3 The furnace atmosphere is the mixed gas of blast furnace gas and coke oven gas;
temperature in each section of the common section, the swinging section, the buffer section and the heating section: the furnace temperature of the common section and the swinging section is 22 ℃ higher than the tapping temperature of the slab; the temperature in the buffer section furnace is 24 ℃ higher than the temperature of the swing section; the temperature in the heating section is 23 ℃ higher than the temperature in the buffer section;
3) Descaling, and controlling the inlet pressure of the descaling water to be 289bar and the outlet pressure to be 307bar; a water baffle is arranged at the descaling water inlet;
4) Hot rolling, seven passes were used during which:
a. controlling the centering deviation of the front shearing guide plate to be 2.1mm;
b. controlling the centering deviation of a rolling final guide plate to be 1.80mm;
c. controlling the rolling reduction of the first pass at 46% and the rolling reduction of the second pass at 51%; the rolling reduction of the 3 rd to 6 th passes is conventional, and the rolling reduction of the last pass is 8.1%;
equivalent convexity of the roller: the convexity of the working roll gap of the first pass and the second pass is-0.50 mm, and the convexity of the working roll gap of the third pass to the seventh pass is-0.9 mm;
5) And (5) performing conventional repair post-working procedures.
The detection shows that the average wedge-shaped precision of the strip steel in the embodiment is 97.33%, and the rejection rate caused by low wedge-shaped precision is 0.11%.
Example 4
The steel grade of the non-oriented silicon steel finished product is 50WW600, the thickness of the strip steel is 2.55mm, the width of the strip steel is 1155mm, and the number of rolling blocks is 530;
a method for improving wedge precision of short-process hot-rolled non-oriented silicon steel comprises the following steps:
1) Smelting and pouring into blanks;
2) Heating the slab according to the heating temperature defined by the prior art of steel grades; in the slab heating stage, the control is performed according to the following steps:
after the slab is run to line a: 3 zone, 6 zone, 8 zone and 9 zone, and 3 zone, 6 zone and 8 zone of line B, the running speed of the slab is controlled at 0.75m/s; the internal heat value of the heating furnace is controlled to be 8439Kj/Nm 3 The furnace atmosphere is the mixed gas of blast furnace gas and coke oven gas;
temperature in each section of the common section, the swinging section, the buffer section and the heating section: the furnace temperature of the common section and the swinging section is 22 ℃ higher than the tapping temperature of the slab; the temperature in the buffer section furnace is 22 ℃ higher than the temperature of the swing section; the temperature in the heating section is 21 ℃ higher than the temperature in the buffer section;
3) Descaling, controlling the inlet pressure of the descaling water to 292bar and the outlet pressure to 311bar; a water baffle is arranged at the descaling water inlet;
4) Hot rolling, seven passes were used during which:
a. controlling the centering deviation of the front shearing guide plate to be 1.5mm;
b. controlling the centering deviation of a rolling final guide plate to be 1.45mm;
c. controlling the rolling reduction of the first pass at 49% and the rolling reduction of the second pass at 53%; the rolling reduction of the 3 rd to 6 th passes is conventional, and the rolling reduction of the last pass is 8.0%;
equivalent convexity of the roller: the convexity of the working roll gap of the first pass and the second pass is-0.60 mm, and the convexity of the working roll gap of the third pass to the seventh pass is-0.8 mm;
5) And (5) performing conventional repair post-working procedures.
The detection shows that the average wedge-shaped precision of the strip steel in the embodiment is 97.53%, and the rejection rate caused by low wedge-shaped precision is 0.09%.
Example 5
The steel grade of the non-oriented silicon steel finished product is 50WW600, the thickness of the strip steel is 2.55mm, the width of the strip steel is 1275mm, and the number of rolling blocks is 230;
a method for improving wedge precision of short-process hot-rolled non-oriented silicon steel comprises the following steps:
1) Smelting and pouring into blanks;
2) Heating the slab according to the heating temperature defined by the prior art of steel grades; in the slab heating stage, the control is performed according to the following steps:
after the slab is run to line a: 3 zone, 6 zone, 8 zone and 9 zone, and 3 zone, 6 zone and 8 zone of line B, the running speed of the slab is controlled at 0.75m/s; the internal heat value of the heating furnace is controlled to 8509Kj/Nm 3 Atmosphere in furnaceIs the mixed gas of blast furnace gas and coke oven gas;
temperature in each section of the common section, the swinging section, the buffer section and the heating section: the furnace temperature of the common section and the swinging section is 21 ℃ higher than the tapping temperature of the slab; the temperature in the buffer section furnace is 23 ℃ higher than the temperature in the swing section; the temperature in the heating section is 22 ℃ higher than the temperature in the buffer section;
3) Descaling, controlling the inlet pressure of the descaling water to be 290bar and the outlet pressure to be 310bar; a water baffle is arranged at the descaling water inlet;
4) Hot rolling, seven passes were used during which:
a. controlling the centering deviation of the front shearing guide plate to be 1.8mm;
b. controlling the centering deviation of a rolling final guide plate to be 1.60mm;
c. controlling the rolling reduction of the first pass to be 48% and the rolling reduction of the second pass to be 53%; the rolling reduction of the 3 rd to 6 th passes is conventional, and the rolling reduction of the last pass is 8.3%;
equivalent convexity of the roller: the convexity of the working roll gap of the first pass and the second pass is 0.50mm, and the convexity of the working roll gap of the third pass to the seventh pass is 0.4mm;
5) And (5) performing conventional repair post-working procedures.
The detection shows that the average wedge-shaped precision of the strip steel in the embodiment is 97.18%, and the rejection rate caused by low wedge-shaped precision is 0.14%.
Example 6
The steel grade of the non-oriented silicon steel finished product is 50WW600, the thickness of the strip steel is 2.55mm, the width of the strip steel is 1155mm, and the number of rolling blocks is 642;
a method for improving wedge precision of short-process hot-rolled non-oriented silicon steel comprises the following steps:
1) Smelting and pouring into blanks;
2) Heating the slab according to the heating temperature defined by the prior art of steel grades; in the slab heating stage, the control is performed according to the following steps:
after the slab is run to line a: 3 zone, 6 zone, 8 zone and 9 zone, and 3 zone, 6 zone and 8 zone of line B, the running speed of the slab is controlled at 0.80m/s; internal heat of heating furnaceThe value is controlled to be 8632Kj/Nm 3 The furnace atmosphere is the mixed gas of blast furnace gas and coke oven gas;
temperature in each section of the common section, the swinging section, the buffer section and the heating section: the furnace temperature of the common section and the swinging section is 23 ℃ higher than the tapping temperature of the slab; the temperature in the buffer section furnace is 26 ℃ higher than the temperature of the swing section; the temperature in the heating section is 24 ℃ higher than the temperature in the buffer section;
3) Descaling, controlling the inlet pressure of the descaling water to 292bar and the outlet pressure to 313bar; a water baffle is arranged at the descaling water inlet;
4) Hot rolling, seven passes were used during which:
a. controlling the centering deviation of the front shearing guide plate to be 1.4mm;
b. controlling the centering deviation of a rolling final guide plate to be 1.30mm;
c. controlling the rolling reduction of the first pass at 49% and the rolling reduction of the second pass at 54%; the rolling reduction of the 3 rd to 6 th passes is conventional, and the rolling reduction of the last pass is 8.5%;
equivalent convexity of the roller: the convexity of the roll gap of the working rolls of the first pass and the second pass is-0.30 mm, and the convexity of the roll gap of the working rolls of the third pass to the seventh pass is 0.2mm;
5) And (5) performing conventional repair post-working procedures.
The detection shows that the average wedge-shaped precision of the strip steel in the embodiment is 97.17%, and the rejection rate caused by low wedge-shaped precision is 0.15%.
This embodiment is merely a best example and is not intended to limit the implementation of the technical solution of the present invention.
Claims (5)
1. A method for improving wedge precision of short-process hot-rolled non-oriented silicon steel comprises the following steps:
1) Smelting and pouring into blanks;
2) Heating the slab according to the heating temperature defined by the prior art of steel grades; in the slab heating stage, the control is performed according to the following steps:
after the slab is run to line a: zone 3, zone 6, zone 8 and zone 9, and zone 3, zone 6 and zone 8 of line B, the running speed of the slab is controlled to0.7m/s to 0.9m/s; the internal heat value of the heating furnace is controlled to be 8150-8895KJ/Nm 3 The furnace atmosphere is the mixed gas of blast furnace gas and coke oven gas;
temperature of slab in public section, swing section, buffer section, each section of heating section: the temperature of the slab in the furnace of the public section and the swinging section is 20 ℃ or more higher than the set slab heating tapping temperature; the temperature in the furnace of the buffer section is higher than the temperature in the furnace of the swinging section by more than 20 ℃; the temperature in the heating section is higher than the temperature in the buffer section by more than 20 DEG C
3) Descaling, controlling the inlet pressure of the descaling water to be 280-300 bar and the outlet pressure to be 300-330 bar; a water baffle is arranged at the descaling water inlet;
4) Hot rolling, seven passes were used during which:
a. controlling the centering deviation of the front shearing guide plate to be less than or equal to 3mm;
b. controlling the centering deviation of the rolling final guide plate to be less than or equal to 3mm;
c. controlling the rolling reduction of the first pass to be 45-50% and the rolling reduction of the second pass to be 50-55%; 3 rd to 6 th
The rolling reduction rate of the pass is conventional, and the rolling reduction rate of the last pass is 8-9%;
5) And (5) performing conventional repair post-working procedures.
2. The method for improving wedge precision of short-process hot-rolled non-oriented silicon steel as claimed in claim 1, wherein the method comprises the following steps:
the running speed of the slab is 0.7 m/s-0.83 m/s.
3. The method for improving wedge precision of short-process hot-rolled non-oriented silicon steel as claimed in claim 1, wherein the method comprises the following steps:
the heat value in the slab heating furnace is 8205-8750KJ/Nm 3 。
4. The method for improving wedge precision of short-process hot-rolled non-oriented silicon steel as claimed in claim 1, wherein the method comprises the following steps:
the rolling reduction rate of the first pass is controlled to be 47-50%, and the rolling reduction rate of the second pass is controlled to be 52-55%.
5. The method for improving wedge precision of short-process hot-rolled non-oriented silicon steel as claimed in claim 1, wherein the method comprises the following steps: when the working roll is in a CVC roll shape, the equivalent convexity of each pass of working roll is adjusted to be in the following state before rolling: the convexity of the working roll gap of the first pass and the second pass is adjusted to be-0.7-0.9 mm, and the convexity of the working roll gap of the third pass to the seventh pass is adjusted to be-1.0-0.6 mm.
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