CN111589880B - Control method for improving structure uniformity of on-line cooling process of medium-thickness wall seamless steel pipe - Google Patents
Control method for improving structure uniformity of on-line cooling process of medium-thickness wall seamless steel pipe Download PDFInfo
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- CN111589880B CN111589880B CN202010356777.7A CN202010356777A CN111589880B CN 111589880 B CN111589880 B CN 111589880B CN 202010356777 A CN202010356777 A CN 202010356777A CN 111589880 B CN111589880 B CN 111589880B
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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
- B21B37/76—Cooling control on the run-out table
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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
- B21B37/78—Control of tube rolling
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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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0233—Spray nozzles, Nozzle headers; Spray systems
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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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B2045/0227—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
Abstract
The invention discloses a control method for improving the structure uniformity of a medium-thickness seamless steel tube in an online cooling process, and mainly aims to improve the structure uniformity of the medium-thickness seamless steel tube in the thickness direction in the online cooling process. The main technical scheme of the invention is as follows: the method is realized through a conveying roller way, a cooling device, a pipe overturning mechanism and a control system, and the method realizes that the steel pipe is cooled for many times through the cooling device by controlling the steel pipe to run back and forth on the inclined roller way, cools the steel pipe to the target temperature according to the set cooling path, realizes uniform temperature control in the thickness direction, improves the structural uniformity in the thickness direction of the steel pipe, and further ensures the performance of the steel pipe.
Description
Technical Field
The invention relates to the technical field of hot-rolled seamless steel pipe production, in particular to a control method for improving the structure uniformity of an on-line cooling process of a medium-thickness wall seamless steel pipe.
Background
The control cooling technology is used as an effective means for on-line regulation and control of the structure performance of the hot rolled steel, can fully excavate the potential energy of the steel, improve the effects of fine grain strengthening, precipitation strengthening and phase change strengthening of the steel, further improve the comprehensive performance of the hot rolled product, and is a key process technology for developing the high-strength and high-toughness steel product. In the field of hot-rolled seamless steel pipes, the hot-rolled seamless steel pipes are cooled in an air cooling manner after sizing for a long time in the production process of the hot-rolled seamless steel pipes. The tissue regulation of seamless steel tube products basically depends on alloy element addition and off-line heat treatment processes (normalizing, off-line tempering and the like), so that the hot rolling process is lack of more effective tissue regulation process means besides on-line normalizing. In recent years, various forms of on-line control cooling apparatuses and methods have been disclosed for the circular cross-sectional characteristics and the line layout characteristics of hot-rolled seamless steel pipes.
However, for medium-thick-wall steel pipes, in the cooling process, due to the inherent cooling and heat transfer physical characteristics of the material, temperature gradients exist in different degrees in the thickness direction, so that the microscopic structure of the steel pipe in the thickness direction has difference, and the performance of the steel pipe is affected.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a control method for improving the structure uniformity of a medium-thickness seamless steel tube in an online cooling process, and mainly aims to improve the structure uniformity of the medium-thickness seamless steel tube in the thickness direction of the medium-thickness seamless steel tube in the online cooling process.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
the embodiment of the invention provides a control method for improving the tissue uniformity of an online cooling process of a medium-thickness wall seamless steel pipe, which is realized by a conveying roller way, a cooling device, a pipe turning mechanism and a control system, wherein the conveying roller way comprises a straight roller way and an inclined roller way, the straight roller way and the inclined roller way are arranged behind a sizing mill, and a plurality of pyrometers and hot metal detectors are respectively arranged on the straight roller way and the inclined roller way; the cooling device is arranged on the inclined roller way and comprises a plurality of cooling water spraying rings which are arranged in parallel; the pipe turning mechanism is positioned between the straight roller way and the inclined roller way; the control system is respectively and electrically connected with the conveying roller way, the pipe overturning mechanism and the cooling device; the method comprises the following steps:
s1, when the steel pipe passes through the sizing mill and runs to the first metal detector through the straight roller way, the control system calculates the first cooling regulation of the steel pipe according to the steel pipe specification and the cooling process information issued by the rolling line;
s2, when the steel pipe runs to a second metal detector, the control system controls a pipe turning mechanism to convey the steel pipe to an inclined roller way, and sets the opening configuration, flow and water pressure of a cooling water spray ring in a cooling device according to the first cooling regulation;
s3, when the steel pipe runs to a first high temperature timer, recalculating and setting the current pass cooling regulation by the control system according to the real-time temperature of the steel pipe, and enabling the steel pipe to pass through the cooling device forward at a set speed to finish one pass cooling;
s4, stopping when the steel pipe runs to a third metal detector, waiting for air cooling, setting the opening configuration, flow and water pressure of a cooling water spray ring in the cooling device by the control system according to the next cooling regulation, and after the air cooling is finished, reversely running the steel pipe on the inclined roller way at a set speed;
s5, when the steel pipe runs to the second high temperature timer, recalculating and setting the pass cooling rule by the control system according to the real-time temperature of the steel pipe, enabling the steel pipe to reversely pass through the cooling device to complete two-pass cooling, and enabling the steel pipe to run to a fourth metal detector for air cooling and to perform the next-pass cooling after the air cooling is finished;
and S6, repeating the steps S3, S4 and S5 until the number of cooling channels determined by the control system is completed, and the final cooling temperature and the red returning temperature after cooling reach the target process requirements, and conveying the steel pipe to a cooling bed.
Further, the interval air cooling time between every two roads is 3-11 s;
when the wall thickness of the steel pipe is 25-60mm and the final cooling temperature is 550-680 ℃, the cooling speed of the steel pipe is 5-30 ℃/s, and the temperature drop in the cooling process of each pass is gradually reduced;
when the wall thickness of the steel pipe is less than 45mm, the temperature drop of the last pass is less than or equal to 50 ℃;
when the wall thickness of the steel pipe is greater than or equal to 45mm, the temperature drop of the last pass is less than or equal to 35 ℃.
Further, the control system determining the number of cooling passes in step S6 includes:
and the control system determines the number of cooling channels of the steel pipe according to the wall thickness of the steel pipe and the cooling process, wherein the number of cooling channels of the steel pipe is 2-5.
Furthermore, a cooling water spray ring of the cooling device is communicated with the flow dividing and water collecting pipe through a water distribution pipe and an adjusting valve group;
the reposition of redundant personnel collector pipe and cooling device parallel arrangement, just the length of reposition of redundant personnel collector pipe is greater than cooling device's length is 1.5m at least.
Furthermore, the shunt water collecting pipe is communicated with a plurality of bypass pipelines, and the bypass pipelines are provided with regulating valves which are used for regulating the opening degree of the bypass pipelines.
By means of the technical scheme, the invention at least has the following beneficial effects:
according to the technical scheme provided by the embodiment of the invention, the steel pipe is controlled to run back and forth on the inclined roller way, so that the steel pipe is cooled for multiple times through the cooling device, the steel pipe is cooled to the target temperature according to the set cooling path, the uniform control of the temperature in the thickness direction of the steel pipe is realized, the tissue uniformity in the thickness direction of the steel pipe is improved, and the performance of the steel pipe is further ensured.
Drawings
Fig. 1 is a schematic structural diagram of an online cooling system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present embodiment, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore, should not be construed as limiting the scope of the present embodiment.
The embodiment of the invention provides a control method for improving the structure uniformity of an on-line cooling process of a medium-thick wall seamless steel pipe, which is used for improving the structure uniformity of the medium-thick wall seamless steel pipe in the thickness direction after on-line cooling of the medium-thick wall seamless steel pipe of 25-60 mm. As shown in fig. 1, the method is realized by a conveying roller way, a cooling device 3, a pipe turning mechanism and a control system, wherein the conveying roller way comprises a straight roller way 1 arranged behind a sizing mill and an inclined roller way 2 with a variable angle, and a plurality of pyrometers and hot metal detectors are respectively arranged on the straight roller way 1 and the inclined roller way 2; the cooling device 3 is arranged on the inclined roller way 2 and comprises a plurality of cooling water spraying rings which are arranged in parallel; the tube turning mechanism is positioned between the straight roller way 1 and the inclined roller way 2; the control system is respectively and electrically connected with the conveying roller way, the pipe overturning mechanism and the cooling device 3.
The plurality of pyrometers can comprise a first pyrometer 4 and a second pyrometer 5 which are arranged at the inclined roller bed 2 and are sequentially and respectively positioned in front of and behind the cooling device 3; the plurality of hot metal detectors may include a first hot metal detector 6, a second hot metal detector 7, a third hot metal detector 8 and a fourth hot metal detector 9, and the first hot metal detector 6 and the second hot metal detector 7 are disposed at the straight roller table 1, and the third hot metal detector 8 and the fourth hot metal detector 9 are disposed at the inclined roller table 2 and sequentially located after the second pyrometer 5 and before the first pyrometer 4, respectively; the pipe-turning mechanism is located at the second hot metal detector 7, wherein the pipe-turning mechanism may include a first pipe-turning mechanism 10 and a second pipe-turning mechanism 11, and the first pipe-turning mechanism 10 is located at the second hot metal detector 7, wherein the above-mentioned steel pipe online cooling system is prior art, and specifically, the system may be formed by an annular jet cooling water spray ring composed of circular water spray cooling rings. In the cooling process, the control system controls the running speed of the roller way, the opening number and the opening mode of the circular spraying rings and adjusts the pressure and the flow of cooling water in the circular spraying rings according to the process requirements, so that the steel pipe is cooled on line at a certain cooling speed, the cooling effect is good, and the application range is wide.
The control method for improving the structure uniformity of the on-line cooling process of the medium-thickness seamless steel pipe specifically comprises the following steps:
and S1, after the steel pipe passes through the sizing mill 12 and runs to the first hot metal detector 6 through the straight roller way 1, the control system calculates the first cooling regulation of the steel pipe according to the steel pipe specification and the cooling process information issued by the rolling line.
Specifically, after the tube blank is subjected to the processes of piercing, rolling and sizing, an online cooling process is performed, and the online cooling procedure of the steel tube can comprise cooling pass, pass temperature, pass cooling speed, the opening number of pass cooling water spray rings, configuration, flow and water pressure.
And S2, when the steel pipe runs to the second hot metal detector 7, the control system controls the pipe turning mechanism to convey the steel pipe to the inclined roller way 2, and sets the opening configuration, the flow rate and the water pressure of a cooling water spray ring in the cooling device 3 according to the first cooling regulation.
And S3, when the steel pipe runs to the first pyrometer 4, recalculating and setting the current-pass cooling regulation by the control system according to the real-time temperature of the steel pipe, and finishing one-pass cooling of the steel pipe by the cooling device 3 at the set speed in the forward direction.
And S4, after primary cooling is completed, stopping the steel pipe when the steel pipe runs to the third hot metal detector 8, waiting for air cooling, setting the opening configuration, flow and water pressure of a cooling water spray ring in the cooling device 3 by the control system according to the next cooling regulation, and after the air cooling is completed, reversely running the steel pipe on the inclined roller way 2 at a set speed.
Among them, the air cooling is to prevent the surface of the steel pipe from being excessively cooled, thereby improving the structural uniformity in the thickness direction of the steel pipe.
And S5, when the steel pipe runs to the second pyrometer 5, recalculating and setting the cooling schedule of the pass by the control system according to the real-time temperature of the steel pipe, enabling the steel pipe to reversely pass through the cooling device 3 to complete cooling of the two passes, running the steel pipe to the fourth hot metal detector 9 for air cooling, and cooling the steel pipe of the next pass after the air cooling is finished.
Among them, the air cooling is to prevent the surface of the steel pipe from being excessively cooled, thereby improving the structural uniformity in the thickness direction of the steel pipe.
And S6, repeating the steps S3, S4 and S5 until the number of cooling channels determined by the control system is completed, the final cooling temperature and the red returning temperature after cooling reach the target process requirements, and conveying the steel pipe to a cooling bed, wherein the steel pipe can be conveyed to the cooling bed through a second pipe-turning mechanism 11.
According to the control method for improving the structure uniformity of the on-line cooling process of the medium-thickness seamless steel pipe, provided by the embodiment of the invention, the steel pipe is controlled to run back and forth on the inclined roller way 2, so that the steel pipe is cooled for multiple times through the cooling device 3, the steel pipe is cooled to the target temperature according to the set cooling path, the uniform control of the temperature in the thickness direction of the steel pipe is realized, the structure uniformity in the thickness direction of the steel pipe is improved, and the performance of the steel pipe is further ensured.
The control system can control the number of times of the cooling channel, the water amount of the spray ring, the pass cooling speed, the roller speed and other process parameters to be flexibly regulated and controlled, so that the temperature of the hot-rolled seamless steel pipe can be accurately controlled in the on-line control cooling process, the cooling effect is further improved, and the product quality is improved.
In some examples, the interval air cooling time between lanes is 3-11 s; when the wall thickness of the steel pipe is 25-60mm and the final cooling temperature is 550-680 ℃, the cooling speed of the steel pipe is 5-30 ℃/s, and the temperature drop in the cooling process of each pass is gradually reduced; when the wall thickness of the steel pipe is less than 45mm, the temperature drop of the last pass is less than or equal to 50 ℃; when the wall thickness of the steel pipe is greater than or equal to 45mm, the temperature drop of the last pass is less than or equal to 35 ℃, so that the tissue uniformity of the medium-thickness steel pipe in the thickness direction is better improved.
In some examples, the determining, by the control system in the foregoing step S6, the number of cooling passes may specifically include: and the control system determines the number of cooling channels of the steel pipe according to the wall thickness of the steel pipe and the cooling process, wherein the number of cooling channels of the steel pipe is 2-5.
In some examples, the cooling water spray ring of the cooling device 3 communicates with the diversion header through water piping and a regulating valve block; the shunting water collecting pipe is arranged in parallel with the cooling device 3, and the length of the shunting water collecting pipe is at least 1.5m greater than that of the cooling device 3.
In the above embodiment, the diversion water collecting pipe may be a pipe structure with blind plates at two ends, and may be communicated with the water inlet of the cooling water spraying ring through a water supply pipeline provided with an adjusting valve. In order to solve the technical problem that unstable turbulence is easily formed at the blind plates at the two ends of the diversion water collecting pipe when water comes, and if the turbulence enters the cooling water spray ring, the pressure of the whole cooling device 3 is easily unstable, the length of the diversion water collecting pipe is set to be larger than that of the cooling device 3, namely when the diversion water collecting pipe and the cooling water spray ring are arranged in parallel, the two ends of the diversion water collecting pipe respectively exceed the two ends of the cooling device 3, so that the turbulence is prevented from entering the cooling water spray ring 7, and the pressure stability of the cooling device 3 is further ensured. In particular, the length of the diversion header may be at least 1.5m greater than the length of the cooling device 3.
In some examples, set up the annular partition plate who divide into its inner chamber into intake antrum and play water cavity in the cooling water spray ring, be provided with the through-flow hole of equipartition on this annular partition plate, intake antrum and play water cavity are through the through-flow hole intercommunication, and such structural arrangement can make after getting into the intake antrum from the water inlet, can get into out the water cavity again after buffering through each through-flow hole to spout steadily through the delivery port, further guaranteed cooling device 336's water pressure stability, thereby guaranteed the cooling effect.
In some examples, the diversion water collecting pipe is communicated with a plurality of bypass pipelines, the bypass pipelines are provided with pressure regulating valves, and outlets of the bypass pipelines are used for being communicated with the rolling groove and changing the opening size of the bypass pipelines by adjusting the pressure regulating valves so as to realize the adjustment of the cooling water pressure of the diversion water collecting pipe and ensure the pressure stability of the water outlet of the cooling water spraying ring.
The present invention will be specifically described below with reference to specific examples.
Example 1
S1: after the tube blank is subjected to the processes of punching, rolling and sizing, the Q345B seamless steel tube with the outer diameter of 457mm and the wall thickness of 30mm is subjected to an online cooling process, when the steel tube runs to the first hot metal detector 6, the control system receives the steel tube specification and the cooling process information issued by a rolling line, and calculates the online cooling regulation of the steel tube: the roller speed is 1.4m/s, 3-pass cooling is adopted, the temperature drop of the pass cooling is respectively 150 ℃, 100 ℃ and 50 ℃, the pressure of cooling water is 0.5MPa, the flow rate of a single cooling spray ring is 125m3/h, and the air cooling time is 5 s;
s2: when the steel pipe runs to the second hot metal detector 7, the steel pipe is turned to the variable-angle inclined roller way 2 through the first pipe turning mechanism 10, a cooling system is controlled to set the opening configuration, flow and pressure of a cooling spray ring according to a first cooling rule, the opening degree of a bypass pipeline is adjusted through a diversion water collecting pipe, and the water pressure of the spray ring is adjusted to a target value and is stably controlled;
s3: when the steel pipe runs to the first pyrometer 4, the cooling system is controlled to recalculate and set the current pass cooling schedule according to the real-time temperature of the steel pipe, and then the steel pipe passes through the cooling area forward at a set speed to finish one pass cooling;
s4: after primary cooling is finished, the steel pipe runs to the third hot metal detector 8 and stops, air cooling is waited, a cooling system is controlled to set the opening configuration and flow rate of a cooling spray ring according to the next cooling regulation, the opening degree of a bypass pipeline of a diversion water collecting pipe is adjusted, the water pressure of the spray ring is stabilized at a target value, and the inclined roller way 2 runs reversely according to a set speed after the air cooling is finished;
s5: when the steel pipe reaches the second pyrometer 5, the cooling system is controlled to recalculate and set the pass cooling schedule according to the real-time temperature. The steel pipe reversely passes through the cooling area to finish primary cooling, the steel is operated to the fourth hot metal detector 9 for air cooling after secondary cooling operation is finished, and the next primary cooling is carried out after the air cooling is finished;
s6: and repeating S3, S4 and S5 according to the process rule calculated by the control cooling system until 3 times are finished, wherein the temperature of the cooled red returning is within the range of 630-660 ℃, and the steel pipe is conveyed to a cooling bed through a blanking and pipe-turning mechanism.
The steel pipe after cooling had a structure comprising ferrite pearlite and had hardness of 173, 179 and 181HB from the inner wall to the outer wall in the thickness direction, respectively, and good uniformity was exhibited. The yield strength of the steel pipe is 376MPa, the tensile strength is 552MPa, and the elongation is 29 percent.
Example 2
S1: after the tube blank is subjected to the processes of punching, rolling and sizing, a Q345B seamless steel tube with the temperature of 990-1010 ℃, the outer diameter of 402mm and the wall thickness of 60mm is manufactured, when the steel tube runs to the first hot metal detector 6, the control system receives the steel tube specification and the cooling process information issued by a rolling line, and the online cooling regulation of the steel tube is calculated: the roller speed is 1.2m/s, 5-pass cooling is adopted, the temperature drop of each pass is 120, 100, 80, 60 and 30 ℃, the pressure of cooling water is 0.6MPa, the flow rate of a single cooling spray ring is 125m3/h, and the air cooling time is 8 s;
s2: when the steel pipe runs to the second hot metal detector 7, the steel pipe is turned to the inclined roller way 2 with a variable angle through the first turning area rotating arm, a cooling system is controlled to set the opening configuration, flow and pressure of a cooling spray ring according to a first cooling rule, the opening degree of a bypass pipeline is adjusted through a diversion water collecting pipe, and the water pressure of the spray ring is adjusted to a target value and is stably controlled;
s3: when the steel pipe runs to the first pyrometer 4, the cooling system is controlled to recalculate and set the current pass cooling schedule according to the real-time temperature of the steel pipe, and then the steel pipe passes through the cooling area forward at a set speed to finish one pass cooling;
s4: after primary cooling is finished, the steel pipe runs to the third hot metal detector 8 and stops, air cooling is waited, a cooling system is controlled to set the opening configuration and flow rate of a cooling spray ring according to the next cooling regulation, the opening degree of a bypass pipeline of a diversion water collecting pipe is adjusted, the water pressure of the spray ring is stabilized at a target value, and the inclined roller way 2 runs reversely according to a set speed after the air cooling is finished;
s5: when the steel pipe reaches the second pyrometer 5, the cooling system is controlled to recalculate and set the pass cooling schedule according to the real-time temperature. The steel pipe reversely passes through the cooling area to finish primary cooling, the steel is operated to the fourth hot metal detector 9 for air cooling after secondary cooling operation is finished, and the next primary cooling is carried out after the air cooling is finished;
s6: and repeating S3, S4 and S5 according to the process rule calculated by the control cooling system until 5 times are finished, wherein the temperature of the cooled red returning is within the range of 600-630 ℃, and the steel pipe is conveyed to a cooling bed through a blanking and pipe-turning mechanism.
The steel pipe after cooling had a structure comprising ferrite pearlite and had hardness of 161, 173, and 179HB from the inner wall to the outer wall in the thickness direction, respectively, and good uniformity was exhibited. The yield strength of the steel pipe is 353MPa, the tensile strength is 542MPa, and the elongation is 29 percent.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A control method for improving the tissue uniformity of an on-line cooling process of a medium-thickness seamless steel pipe is characterized in that the method is realized by a conveying roller way, a cooling device, a pipe turning mechanism and a control system, wherein the conveying roller way comprises a straight roller way and an inclined roller way with variable angles, which are arranged behind a sizing mill, and a plurality of pyrometers and hot metal detectors are respectively arranged on the straight roller way and the inclined roller way; the cooling device is arranged on the inclined roller way and comprises a plurality of cooling water spraying rings which are arranged in parallel; the pipe turning mechanism is positioned between the straight roller way and the inclined roller way; the control system is respectively and electrically connected with the conveying roller way, the pipe overturning mechanism and the cooling device; the method comprises the following steps:
s1, when the steel pipe passes through the sizing mill and runs to the first metal detector through the straight roller way, the control system calculates the first cooling regulation of the steel pipe according to the steel pipe specification and the cooling process information issued by the rolling line;
s2, when the steel pipe runs to a second metal detector, the control system controls a pipe turning mechanism to convey the steel pipe to an inclined roller way, and sets the opening configuration, flow and water pressure of a cooling water spray ring in a cooling device according to the first cooling regulation;
s3, when the steel pipe runs to a first high temperature timer, recalculating and setting the current pass cooling regulation by the control system according to the real-time temperature of the steel pipe, and enabling the steel pipe to pass through the cooling device forward at a set speed to finish one pass cooling;
s4, stopping when the steel pipe runs to a third metal detector, waiting for air cooling, setting the opening configuration, flow and water pressure of a cooling water spray ring in the cooling device by the control system according to the next cooling regulation, and after the air cooling is finished, reversely running the steel pipe on the inclined roller way at a set speed;
s5, when the steel pipe runs to a second high temperature timer, recalculating and setting the pass cooling regulation by the control system according to the real-time temperature of the steel pipe, enabling the steel pipe to reversely pass through the cooling device to complete two passes of cooling, enabling the steel pipe to run to a fourth metal detector for air cooling, and cooling the steel pipe for the next pass after the air cooling is finished;
and S6, repeating the steps S3, S4 and S5 until the number of cooling channels determined by the control system is completed, and the final cooling temperature and the red returning temperature after cooling reach the target process requirements, and conveying the steel pipe to a cooling bed.
2. The control method according to claim 1,
the interval air cooling time between every two roads is 3-11 s;
when the wall thickness of the steel pipe is 25-60mm and the final cooling temperature is 550-680 ℃, the cooling speed of the steel pipe is 5-30 ℃/s, and the temperature drop in the cooling process of each pass is gradually reduced;
when the wall thickness of the steel pipe is less than 45mm, the temperature drop of the last pass is less than or equal to 50 ℃;
when the wall thickness of the steel pipe is greater than or equal to 45mm, the temperature drop of the last pass is less than or equal to 35 ℃.
3. The control method of claim 1, wherein the control system determining the number of cooling passes in step S6 comprises:
and the control system determines the number of cooling channels of the steel pipe according to the wall thickness of the steel pipe and the cooling process, wherein the number of cooling channels of the steel pipe is 2-5.
4. The control method according to claim 1,
a cooling water spraying ring of the cooling device is communicated with the flow dividing and water collecting pipe through a water distribution pipe and an adjusting valve group;
the reposition of redundant personnel collector pipe and cooling device parallel arrangement, just the length of reposition of redundant personnel collector pipe is greater than cooling device's length is 1.5m at least.
5. The control method according to claim 4,
the shunt water collecting pipe is communicated with a plurality of bypass pipelines, and the bypass pipelines are provided with regulating valves which are used for regulating the opening degree of the bypass pipelines.
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