WO2021218357A1 - On-line cooling system for hot-rolled seamless steel tube, and arrangement method for cooling device on on-line cooling system - Google Patents

Abstract

Disclosed are an on-line cooling system for a hot-rolled seamless steel tube, and an arrangement method for a cooling device on the on-line cooling system, with the main purpose thereof being to improve the production efficiency and the comprehensive performance of hot-rolled seamless steel tubes. According to the main technical solution of the present invention, the production line comprises a sizing front roller table and a sizing rear roller table which are respectively located in front of and behind a sizing mill, and a cooling roller table and a cooling device which are located between a cooling bed and the sizing mill, wherein the cooling device is arranged at the sizing front roller table, and/or the cooling device is arranged at the sizing rear roller table, and/or the cooling device is arranged at the cooling roller table; the cooling device comprises a plurality of cooling water spraying rings arranged in the conveying direction of the roller table; the surface of the cooling water spraying ring is provided with a water inlet which is in communication with a flow dividing and water collection pipe by means of a water supply pipeline and an adjustment valve group, with the flow dividing and water collection pipe being parallel to the cooling device, and the length of the flow dividing and water collection pipe being longer than the length of the cooling device; and the inner wall of the cooling water spraying ring is provided with a water outlet, and the cooling water spraying ring is internally provided with an annular partition plate, in which through-flow holes are arranged.

Description

On-line cooling system of hot-rolled seamless steel pipe and arrangement method of cooling device on it Technical field

The invention relates to the technical field of production of hot-rolled seamless steel pipes, in particular to an online cooling system for hot-rolled seamless steel pipes and a method for arranging cooling devices thereon.

Background technique

At present, in the production process of hot-rolled seamless steel pipes, during the sizing process, in order to ensure the better mechanical properties of the steel pipe or to control the tube shape of the steel pipe, it is usually necessary to use air cooling to wait for the temperature to make the temperature during the sizing relatively low. , Which reduces the production efficiency of hot-rolled seamless steel pipes. Moreover, when the hot-rolled seamless steel pipe is at the outlet of the sizing, the austenite grains will easily grow excessively due to high temperature, which is not conducive to the grain refinement of the ferrite transformation process, thereby affecting the mechanical properties of the steel pipe. At the same time, when the hot-rolled seamless steel pipe is between the sizing machine and the cooling bed, the on-line control of the microstructure and properties of the hot-rolled seamless steel pipe after rolling cannot be realized, so that the control of the type, shape, and size of the steel pipe cannot be achieved, and the steel pipe The overall performance is low.

Summary of the invention

In view of this, the embodiments of the present invention provide an online cooling system for hot-rolled seamless steel pipes and a method for arranging cooling devices thereon, the main purpose of which is to improve the production efficiency and comprehensive performance of the hot-rolled seamless steel pipes.

In order to achieve the above objectives, the present invention mainly provides the following technical solutions:

On the one hand, an embodiment of the present invention provides an online cooling system for hot-rolled seamless steel pipes, including:

The sizing front roller table and the sizing rear roller table respectively located before and after the sizing machine, the cooling roller table and the cooling device between the cooling bed and the sizing machine;

The cooling device is arranged at the roller table before sizing, and its height can be adjusted with the height of the roller table before sizing; and/or, the cooling device is arranged at the roller table after sizing, And its height can be adjusted with the height of the roller table after sizing; and/or, the cooling device is arranged at the cooling roller table, and its height is adjusted by a hydraulic drive device;

The cooling device includes a plurality of cooling water spray rings arranged along the conveying direction of the roller table;

The outer surface of the cooling water spray ring is provided with a water inlet, and the water inlet is in communication with a branching and collecting pipe through a water supply pipeline and a regulating valve group. The branching and collecting pipe is arranged in parallel with the cooling device, and the branching and collecting pipe is arranged in parallel with the cooling device. The length of is greater than the length of the cooling device;

The inner wall of the cooling water spray ring is provided with a plurality of rows of evenly distributed cooling nozzles, and an annular partition that divides its inner cavity into a water inlet cavity and a water outlet cavity is provided in the cooling water spray ring. The plate is provided with a through hole, the water inlet cavity and the water outlet cavity are communicated through the through hole, and the flow rate and pressure stability of the cooling water sprayed from the cooling nozzle of the cooling water spray ring are determined by the water inlet The flow rate and the arrangement form and size of the through-flow holes on the annular baffle are controlled;

The cooling water spray ring includes an upper half water spray ring and a lower water spray ring that are opposite and independent of each other; or, the cooling water spray ring is an integrally connected integral annular water spray ring;

The annular baffle includes an upper half baffle and a lower half baffle that are opposed to each other, and the upper half baffle and the lower half baffle in turn divide the inner cavities of the upper half water spray ring and the lower half water spray ring respectively. Is the water inlet cavity and the water outlet cavity, the upper and lower partitions are respectively provided with the through holes; or, the annular partition is an integral annular plate-shaped structure, and the integral annular The plate-like structure divides the inner cavity of the integral annular water spray ring into the water inlet cavity and the water outlet cavity, and the integral annular plate-like structure is provided with the flow hole;

The two ends of the upper half of the water spray ring are respectively provided with a first sewage outlet and a second sewage outlet communicating with the water inlet and outlet chambers, and the middle of the side of the lower half of the water spray ring is provided with the water inlet The third sewage outlet and the fourth sewage outlet communicated with the cavity and the water outlet cavity; or, the middle position of the lower side of the integral annular water spray ring is provided with a fifth sewage outlet communicating with the water inlet cavity and the water outlet cavity respectively And the sixth sewage outlet;

Further, the first sewage outlet, the second sewage outlet, the third sewage outlet, the fourth sewage outlet, the fifth sewage outlet and the sixth sewage outlet are all buckled with a detachable cover; and/or, the The first sewage outlet, the second sewage outlet, the third sewage outlet, the fourth sewage outlet, the fifth sewage outlet and the sixth sewage outlet are all provided with sewage valves.

Further, when the cooling device is arranged at the roller table before the sizing, the inner diameter of the cooling water spray ring is larger than when the cooling device is arranged at the roller table after the sizing. The size of the inner diameter of the cooling water spray ring when the cooling device is arranged at the cooling roller table.

Further, when the cooling device is arranged at the roller table before the sizing, the number of the cooling water spray ring is 2-8, the inner diameter is 550-720mm, and the cooling nozzle is arranged along its annular inner wall surface. The evenly arranged 4-10 rows, the water pressure adjustment range is 0.2～0.8Mpa, the flow range of the upper half water spray ring and the lower half water spray ring are both 80～240m3/h, the upper half water spray ring and The water ratio of the lower half of the water spray ring is 1.05～1.5; or, the flow rate of the integral annular water spray ring is 160～480m ³ /h, and the water inlet located at the upper end of the integral annular water spray ring and the water inlet located on the integral annular water The water inlet water ratio at the lower end of the spray ring is 1.05～1.5;

When the cooling device is arranged at the roller table after the sizing, the number of the cooling water spray ring is 3-10, the inner diameter is 450-660mm, and the cooling nozzles are evenly arranged along the annular inner wall surface. The water pressure adjustment range of the 4-10 rows is 0.2～0.8Mpa; the flow rate range of the upper half water spray ring and the lower half water spray ring are both 80～220m ³ /h, the upper half water spray ring and the lower half The water ratio of the water spray ring is 1.05～1.5; or, the flow rate of the integral annular water spray ring is 160～440m ³ /h, and the water inlet located at the upper end of the integral annular water spray ring and the integral annular water spray The water inlet water ratio at the lower end of the ring is 1.05～1.5;

When the cooling device is arranged at the cooling roller table, the number of the cooling water spray ring is 30-60, the inner diameter is 450-660mm, and the cooling nozzles are 2 evenly arranged along the annular inner wall. ～8 rows, the water pressure adjustment range is 0.2～0.8Mpa, the flow range of the upper half water spray ring and the lower half water spray ring are both 30～180m ³ /h, the upper half water spray ring and the lower half water spray The annular water ratio is 1.05～1.5; or, the flow rate of the integral annular water spray ring is 60～360m ³ /h, and the water inlet located at the upper end of the integral annular water spray ring and the lower end of the integral annular water spray ring The water inlet water ratio is 1.05～1.5.

Further, a plurality of bypass pipelines are communicated with the branch water collection pipe, a pressure regulating valve is provided on the bypass pipeline, and the outlet of the bypass pipeline is used to communicate with the rolling groove.

Further, the length of the water dividing and collecting pipe is at least 1.5 m greater than the length of the cooling device.

On the other hand, an embodiment of the present invention provides a method for arranging a cooling device on a hot-rolled seamless steel pipe on-line cooling system. The hot-rolled seamless steel pipe on-line cooling system is the aforementioned hot-rolled seamless steel pipe on-line cooling system. The method includes:

According to the outline process requirements of the hot-rolled seamless steel pipe production line, the cooling device is installed at the roll table before the sizing, the cooling device is installed at the roll table after the sizing, and the cooling device is installed at the roll table. One or more combinations in the cooling roller table to cool the hot-rolled seamless steel pipe.

With the above technical solutions, the present invention has at least the following beneficial effects:

In the technical solution provided by the embodiment of the present invention, the cooling device may be arranged at the roller table before sizing; and/or at the roller table after sizing; and/or at the cooling roller table to achieve When the cooling device is installed at the roller table before sizing, water cooling can be used to reduce the heating time of the steel pipe, thereby improving production efficiency; when the cooling device is installed at the roller table after the sizing, the steel pipe after the sizing Perform rapid cooling to retain the austenite in the work-hardened state, which is beneficial to the grain refinement of the ferrite transformation process, thereby ensuring the mechanical properties of the steel pipe; when the cooling device is installed at the cooling roller table, the steel pipe can be rolled The online control of the post-structure performance, so as to realize the control of the type, shape, and size of the steel pipe, to achieve the effect of strengthening mechanism such as fine grain strengthening, dislocation strengthening, and phase transformation strengthening, thereby improving the comprehensive performance of the steel pipe. This embodiment can According to the outline process requirements of the hot-rolled seamless steel pipe online cooling system, one or more of the above-mentioned methods are used to cool the hot-rolled seamless steel pipe.

Among them, the cooling water spray ring of the cooling device can be adjusted in height through the sizing front roller table, the sizing roller table or the hydraulic driving device, so that the steel pipe can be cooled in the center to ensure the cooling effect. Moreover, the inner cavity of the cooling water spray ring of the cooling device in the embodiment of the present invention is divided into a water inlet cavity and a water outlet cavity by an annular partition, so that the water flow of the inlet cavity can flow into the water outlet cavity through the through holes on the annular partition. It is sprayed from the cooling nozzle to ensure the stability of the spraying flow of the cooling spray ring and improve the cooling effect. In addition, the length of the splitter header is longer than the length of the cooling device, which prevents the unstable turbulence formed at the blind plates at both ends of the splitter header from affecting the pressure of the cooling device when water comes in, thereby ensuring that the pressure of the cooling device is more stable. .

Description of the drawings

Figure 1 is a schematic structural diagram of an online cooling system for hot-rolled seamless steel pipes according to an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a cooling water spray ring of the cooling device in Fig. 1;

Figure 3 is a schematic diagram of the structure of the lower half of the water spray ring in Figure 2;

Figure 4 is a schematic diagram of the structure of the upper half of the water spray ring in Figure 2;

Fig. 5 is a schematic structural diagram of another cooling water spray ring of the cooling device in Fig. 1 from a first perspective;

Fig. 6 is a schematic structural diagram of another cooling water spray ring of the cooling device in Fig. 1 from a second perspective.

Detailed ways

In order to make the objectives, 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 in conjunction with the drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, but not all of the embodiments. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention. The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In the description of this embodiment, it should be understood that the terms "center", "vertical", "horizontal", "front", "rear", "left", "right", "vertical", and "horizontal" The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiment and simplifying the description, rather than indicating or It is implied that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the protection scope of this embodiment.

As shown in Figures 1 to 6, an embodiment of the present invention provides an online cooling system for hot-rolled seamless steel pipes, which includes a sizing front roller table 2 and a sizing rear roller table 3 respectively located before and after the sizing machine 1. The cooling roller table 5 and the cooling device 6 located between the cooling bed 4 and the sizing machine 1; the cooling device 6 is arranged at the roller table 2 before the sizing, and its height can be adjusted with the height of the roller table 2 before the sizing; and /Or, the cooling device 6 is arranged at the roller table 3 after the sizing, and its height can be adjusted with the height of the roller table 3 after the sizing; and/or, the cooling device 6 is arranged at the cooling roller table 5, and its height passes The hydraulic driving device is adjusted; the cooling device 6 includes a plurality of cooling water spray rings 7 arranged along the conveying direction of the roller table; the outer surface of the cooling water spray ring 7 is provided with a water inlet 71, which passes through the water supply pipeline and the regulating valve group It is connected to the branching collection pipe, and the branching collection pipe is arranged in parallel with the cooling device 6, and the length of the branching collection pipe is greater than the length of the cooling device 6; the inner wall of the cooling water spray ring 7 is provided with multiple rows of evenly distributed cooling nozzles 72, and The cooling water spray ring 7 is provided with an annular partition 73 that divides its inner cavity into a water inlet cavity and a water outlet cavity. The annular partition 73 is provided with a through hole. The flow rate and pressure stability of the cooling water sprayed from the cooling nozzle 72 of the cooling water spray ring 7 can be controlled by the flow rate of the water inlet 71 and the arrangement and size of the through holes on the annular partition 73.

Among them, FIG. 1 shows that the cooling device is arranged on the sizing front roller table 2, the sizing roller table 3, and the cooling roller table 6.

In the online cooling system for hot-rolled seamless steel pipes, the cooling device 6 can be installed at the roller table 2 before sizing, at the roller table 3 after sizing, and at the cooling roller table 5 according to the process requirements of the outline. One or more of them can be combined, which is flexible and convenient to use.

In some examples, the branch water collection pipe may be a pipe structure with blind plates at both ends, and it may communicate with the water inlet 71 of the cooling water spray ring 7 through a water supply pipe provided with a regulating valve group. Since the split header is prone to form unstable turbulence at the blind plates at both ends when water comes in, if this turbulence enters the cooling water spray ring 7, it will easily cause the pressure of the entire cooling device 6 to be unstable. In order to solve this Technical problem: In the embodiment of the present invention, the length of the splitter header is set to be greater than the length of the cooling device 6, that is, when the two are arranged in parallel, the two ends of the splitter header extend beyond the two ends of the cooling device 6, so as to avoid the turbulence. Into the cooling water spray ring 7, thereby ensuring the pressure stability of the cooling device 6. Specifically, the length of the water distribution and collection pipe may be greater than the length of the cooling device 6 by at least 1.5 m.

In some examples, the cooling water spray ring 7 is provided with an annular partition 73 that divides its inner cavity into a water inlet cavity and a water outlet cavity. The annular partition 73 is provided with uniformly distributed through holes, water inlet and The water outlet cavity is connected through the through-flow holes. Such a structure is arranged so that after entering the water cavity from the water inlet 71, it can be buffered by each through-flow hole before entering the water outlet cavity, and stably sprayed out through the cooling nozzle 72, further The water pressure stability of the cooling device 6 is ensured, thereby ensuring the cooling effect.

In some examples, referring to Figures 2, 3 and 4, the cooling water spray ring 7 may include an upper half of the water spray ring 74 and a lower half of the water spray ring 75 that are opposite and independent of each other, and the annular partition 73 includes opposite upper halves. The inner cavity of the upper water spray ring 74 and the lower water spray ring 75 are divided into the water inlet cavity and the water outlet cavity respectively by the upper and lower diaphragms. And the lower half of the partition plate are respectively provided with through holes; the upper half of the water spray ring 74 is provided with a first sewage outlet 741 and a second sewage outlet 742 connected to its water inlet and outlet cavity on both end faces; the lower half The middle of the side of the water spray ring 75 is provided with a third sewage outlet 751 and a fourth sewage outlet 752 communicating with the water inlet cavity and the water outlet cavity, respectively.

In the above embodiment, the first sewage outlet 741 and the second sewage outlet 742 are respectively arranged on the two end faces of the upper water spray ring 74, so that each sewage outlet is located at the lower end of the upper water spray ring 74 for cleaning the upper half. The waste residue is flushed out when the water spray ring 74 is used. The third sewage outlet 751 and the fourth sewage outlet 752 are respectively arranged in the middle of the side of the lower half of the water spray ring 75, so that each drain is located at the lower end of the lower half of the water spray ring 75, so as to clean the waste when the lower half of the water spray ring 75 Rush out.

Of course, in an alternative embodiment, referring to Figures 5 and 6, the cooling water spray ring may be an integrally connected integral annular water spray ring 8. The outer surface of the integral annular water spray ring 8 is provided with a water inlet 81, which The water inlet 81 is in communication with the branch water collection pipe through the water supply pipeline and the regulating valve group. The inner wall of the integral annular water spray ring 8 is provided with a plurality of rows of uniformly distributed cooling nozzles 82, and the integral annular water spray ring 8 is provided with The inner cavity is divided into a water inlet cavity and an annular baffle of the water outlet cavity. The ring baffle is an integral annular plate structure 83. The integral annular plate structure 83 divides the inner cavity of the integral annular water spray ring 8 into a water inlet cavity and a water outlet cavity. Outlet cavity, the integral annular plate-shaped structure 83 is provided with a through hole; the middle position of the lower side of the integral annular water spray ring 8 can be provided with a fifth sewage outlet and a sixth sewage outlet communicating with the water inlet cavity and the water outlet cavity respectively .

In some examples, the first sewage outlet 741, the second sewage outlet 742, the third sewage outlet 751, the fourth sewage outlet 752, the fifth sewage outlet 85 and the sixth sewage outlet 84 can all be buckled with detachable covers. Body; and/or, the first sewage outlet 741, the second sewage outlet 742, the third sewage outlet 751, the fourth sewage outlet 752, the fifth sewage outlet 85 and the sixth sewage outlet 84 can all be provided with a sewage valve, thereby It is realized that when the cooling water spray ring 7 needs to be cleaned, the cover body and/or the drain valve can be opened for flushing, and after the cleaning is completed, the cover body and/or the drain valve can be closed. Specifically, the cover body can be threadedly connected with each sewage outlet.

In the online cooling system for hot-rolled seamless steel pipes provided by the embodiment of the present invention, the cooling device 6 can be installed at the roller table 2 before sizing; and/or at the roller table 3 after sizing; and/or, at all Said cooling roller table 5, so as to realize that when the cooling device 6 is installed at the roller table 2 before sizing, water cooling can be used to reduce the heating time of the steel pipe, thereby improving production efficiency; when the cooling device 6 is installed at the sizing roller table 2. When the rear roller table is at 3 places, the steel pipe after sizing is rapidly cooled to retain the austenite in the work-hardened state, which is conducive to the grain refinement of the ferrite transformation process, thereby ensuring the mechanical properties of the steel pipe; When the device 6 is installed at the cooling roller table 5, it can realize the online control of the structure and properties of the steel pipe after rolling, so as to realize the control of the type, shape, and size of the steel pipe to achieve grain refinement strengthening, dislocation strengthening, phase transformation strengthening, etc. The mechanism effect, thereby improving the overall performance of the steel pipe, this embodiment can use one or more of the above methods to cool the hot-rolled seamless steel pipe according to the outline process requirements of the hot-rolled seamless steel pipe online cooling system .

Among them, the cooling water spray ring 7 of the cooling device 6 can be adjusted in height through the sizing front roller table 2, the sizing rear roller table 3 or the hydraulic drive device, so as to centrally cool the steel pipe to ensure the cooling effect. Moreover, in the embodiment of the present invention, the inner cavity of the cooling water spray ring 7 of the cooling device 6 is divided into a water inlet cavity and a water outlet cavity by an annular partition 73, so that the water flow of the inlet cavity can pass through the through holes on the annular partition 73 It flows into the water outlet cavity and is sprayed from the cooling nozzle 72 to ensure the stability of the spray flow of the cooling spray ring 7 and improve the cooling effect. In addition, the length of the water splitting header is greater than the length of the cooling device 6, which prevents the unstable turbulence formed at the blind plates at both ends of the water splitting header from affecting the pressure of the cooling device 6, thereby ensuring the cooling device 6 The pressure is more stable.

In some examples, when the cooling device 6 is arranged at the roller table 2 before the sizing, the inner diameter of the cooling water spray ring 7 may be larger than when the cooling device 6 is arranged at the roller table 3 after the sizing and when the cooling device 6 When it is set at the cooling roller table 5, the inner diameter of the cooling water spray ring 7 can better meet the actual requirements.

In some examples, when the cooling device 6 is arranged at the roller table 2 before the sizing, the number of cooling water spray rings 7 can be 2-8, the inner diameter can be 550-720mm, and the cooling nozzle 72 can be arranged along its ring The evenly arranged 4-10 rows on the wall, the water pressure adjustment range can be 0.2-0.8Mpa, the steel pipe passes through the cooling device 6, and the temperature drop is controlled at 20-120°C, reducing the intermediate temperature before sizing; when the cooling device 6 is set at When there are 3 roller tables after sizing, the number of cooling water spray rings 7 can be 3-10, the inner diameter can be 450-660mm, and the cooling nozzles 72 can be 4-10 rows evenly arranged along its annular inner wall. The pressure adjustment range can be 0.2～0.8Mpa. After the steel pipe is cooled, the final cooling temperature is controlled to drop to 35℃ above the Ar3 temperature to ensure that when the steel pipe enters the cooling device 6 between the sizing machine 1 and the cooling bed 4, the cooling temperature is turned on Above Ar3 temperature; when the cooling device 6 is installed at the cooling roller table 5, the number of cooling water spray rings 7 can be 30-60, the inner diameter can be 450-660mm, and the cooling nozzle 72 can be along its annular inner wall surface. Evenly arranged 2-8 rows, the water pressure adjustment range can be 0.2-0.8Mpa, and the temperature of the steel pipe after cooling is controlled at 80-750°C.

In some examples, a plurality of bypass pipelines are communicated with the branch water collection pipe, and a pressure regulating valve is provided on the bypass pipeline. The size of the opening of the bypass pipeline realizes the adjustment of the cooling water pressure and ensures the stable pressure of the cooling nozzle 72 of the cooling water spray ring 7.

In some examples, when the cooling device 6 is installed at the roller table 2 before the sizing, the spray water flow rate of the upper half water spray ring 74 and the lower half water spray ring 75 is 80～240m ³ /h; when the cooling device 6 When installed at the roller table 3 after the sizing, the spray water flow range of the upper half water spray ring 74 and the lower half water spray ring 75 is 80～220m ³ /h; and when the cooling device 6 is installed at the cooling roller table 5 , The spray water flow range of the upper half water spray ring 74 and the lower half water spray ring 75 is 30～180m ³ /h. The water ratio of the upper half of the water spray ring 74 and the lower half of the water spray ring 75 can both be 1.05-1.5. Or, when the cooling device 6 is arranged at the roller table 2 before the sizing, the flow rate of the integral annular water spray ring 8 can be 160～480m ³ /h, and it is located at the water inlet and the lower end of the integral annular water spray ring 8 The water inlet water ratio can be 1.05～1.5; when the cooling device 6 is arranged at the roller table 3 after sizing, the flow range of the integral annular water spray ring 8 can be 160～440m ³ /h, and it is located in the overall annular shape. The water ratio of the water inlet at the upper end and the water inlet at the lower end of the water spray ring 8 can both be 1.05～1.5; and when the cooling device 6 is arranged at the cooling roller table 5, the flow rate range of the integral annular water spray ring 8 can be 60～ 360m ³ /h, and the water inlet at the upper end of the integral annular water spray ring 8 and the water inlet at the lower end may have a water ratio of 1.05 to 1.5.

The embodiment of the present invention also provides a method for arranging a cooling device on a hot-rolled seamless steel pipe on-line cooling system. The hot-rolled seamless steel pipe on-line cooling system is the aforementioned hot-rolled seamless steel pipe on-line cooling system. include:

According to the outline process requirements of the hot-rolled seamless steel pipe production line, the cooling device 6 is installed at the roller table 2 before the sizing, the cooling device 6 is installed at the roller table 3 after the sizing, and the cooling device 6 is installed One or more combinations in the cooling roller table 5 cool the hot-rolled seamless steel pipe, which is flexible and convenient to use.

In the following, the cooling device 6 is installed at the roller table 2 before the sizing, and the cooling device 6 is installed at the roller table 2 before the sizing, the roller table 3 after the sizing, and the cooling roller table 5 as examples. Specific instructions.

Example 1:

According to the product process requirements of the production line, the cooling device 6 is arranged on the sizing front roller table 2, and the height of the cooling device 6 can be adjusted with the height of the sizing front roller table 2 to realize the centering cooling of the steel pipe. It is 8 groups of circular water spray rings. , The cooling water spray ring 7 is composed of an upper water spray ring and a lower water spray ring with an inner diameter of 650 mm arranged symmetrically up and down; 6 rows of cooling nozzles are evenly arranged on the inner surface of the water spray ring, and the number of cooling nozzles in a single row is 52. The water pressure adjustment range of the water ring is 0.2～0.8MPa, the flow rate of the upper and lower spraying rings can be independently controlled, the spraying flow range is 80～150m3/h, and the water ratio of the upper and lower spraying rings is within the range of 1.05～1.5. The water inlet 71 is arranged on the outer surface of the water spray ring, which is connected to the water distribution collection pipe through the water supply pipeline and the regulating valve group. The regulating valve group is used to realize the flow control of the water spray ring. The water distribution collection pipe is parallel to the water supply pipe and the regulating valve group. The arranged cooling water spray ring 7 is connected, and the branch water collection pipe is provided with a number of bypass pipes. The water pressure of the spray ring can be adjusted by adjusting the opening degree of the bypass pipe to ensure stable pressure at the outlet of the cooling nozzle. The total length of the water distribution collection pipe is longer than that of the cooling The length of the device 6 is 1.5m. The water spray ring cavity is divided into a water inlet cavity and a water outlet cavity by an annular water barrier. The annular water barrier is provided with a through hole, and both the water inlet cavity and the water outlet cavity are arranged with sewage holes.

In the process of producing 25Mn seamless steel pipes with an outer diameter of 325mm and a wall thickness of 15mm, the temperature of the steel pipe after continuous rolling is 950～980℃. In order to ensure the size of the steel pipe, it needs to be sized below 930℃. Before sizing, it is usually necessary to wait for 20s to be air-cooled to the target temperature on the chain bed between the continuous rolling and the sizing machine 1 (1). After the cooling water spray ring 7 is added before sizing, the flow, pressure and configuration of the cooling water spray ring 7 are set according to the temperature drop requirements of the steel pipe to ensure that the steel pipe can be directly sized and cooled after cooling.

Example 2:

According to the product process requirements of the production line, the cooling devices 6 are respectively arranged at the roller table 3 after sizing and the cooling roller table 5 between the sizing machine 1 and the cooling bed 4.

The cooling device 6 installed on the roller table 3 after sizing is 10 integral water spray rings 8. The inner diameter of the water spray ring is 660mm, and the inner surface of the water spray ring is evenly arranged with multiple rows of cooling nozzles in the width direction. In order to realize the water spray cooling on the outer surface of the steel pipe, the number of single-row cooling nozzles is 36 to 70, and the water inlet 81 is arranged on the outer surface of the water spray ring. To realize the flow control of the water spray ring. The water pressure adjustment range of the water spray ring is 0.2～0.8MPa, the flow rate of the upper and lower spray rings can be independently controlled, the spray water flow range is 80～220m3/h, and the water ratio of the upper and lower spray rings is within the range of 1.05～1.5;

The cooling device 6 arranged at the cooling roller table 5 (inclined roller table) between the hot-rolled seamless steel pipe sizing machine 1 and the cooling bed 4 is composed of 42 cooling water spray rings 7, which are symmetrical from top to bottom The arranged upper half water spray ring 74 and lower half water spray ring 75 with an inner diameter of 600mm are arranged; 3 rows of cooling nozzles are evenly arranged on the inner surface of the water spray ring, and the water pressure adjustment range of the water spray ring is 0.2～0.8MPa, up and down The spray ring flow can be independently controlled, the spray water flow range is 30～180m3/h, the upper and lower spray ring water ratio is in the range of 1.05～1.5, the cooling device 6 is installed by the hydraulic device to realize the height adjustment of the spray ring to ensure the cooling of the steel pipe. .

The split header is equipped with several bypass pipelines. The spray ring water pressure can be adjusted by adjusting the opening degree of the bypass pipeline, which is used to adjust the cooling water pressure and ensure the stable pressure at the outlet of the cooling nozzle. The total length of the split header at each position The length of the water spray ring is 1.5m longer than the cooling device 6 at the location. The water spray ring cavity is divided into a water inlet cavity and a water outlet cavity by an annular water barrier. Sewage holes are arranged.

In the process of producing 20# steel pipe with outer diameter of 357mm and wall thickness of 40mm, the outlet temperature of the steel pipe is 1010℃. After the steel pipe is sized, it passes through the cooling device after sizing. The post temperature was at 920°C. When the back steel pipe is transported by roller table and rotating arm 9 to the cooling device 6 between the sizing machine 1 and the cooling bed 4, the cooling temperature is 900℃, and the water spray ring is adjusted by adjusting the roller table running speed to 1.0m/s. The number of openings, water volume and pressure control the temperature of the steel pipe after cooling at 640℃, and then turning over to the cooling bed 4 by the rotating arm (10, 11) to cool to room temperature. After testing, the yield strength of the steel pipe is 260MPa, the tensile strength is 448MPa, and the elongation is 34.6. % Makes the mechanical properties of the steel pipe meet the performance requirements. Through forced cooling after sizing, the excessive growth of austenite grains due to high temperature is avoided, which is beneficial to the grain refinement of the ferrite transformation process, thereby affecting the mechanical properties of steel pipes and realizing the rolling of thick gauge steel pipe products. State direct supply.

Example 3:

According to the product process requirements of the production line, the cooling devices 6 are respectively arranged at the roller table 2 before sizing, the roller table 3 after sizing, and the cooling roller table 5 between the sizing machine 1 and the cooling bed 4. The cooling water spray ring 7 is composed of an upper half water spray ring 74 and a lower half water spray ring 75 arranged symmetrically up and down. There are multiple rows of cooling nozzles evenly arranged in the width direction of the inner surface of the water spray ring to realize water spray cooling on the outer surface of the steel pipe. , The number of single-row cooling nozzles ranges from 36 to 70, and the water inlet 71 is arranged on the outer surface of the spray ring, which is connected to the diversion collection pipe through the water supply pipeline and the regulating valve group. The regulating valve group is used to realize the flow control of the spray ring and the diversion The water collection pipe is provided with several bypass pipes. The spray ring water pressure can be adjusted by adjusting the opening degree of the bypass pipe, which is used to adjust the cooling water pressure and ensure the stable pressure at the outlet of the cooling nozzle. The total length of the split water collection pipe at each position The length of the cooling device 6 is 1.5m longer than the location. The water spray ring cavity is divided into a water inlet cavity and a water outlet cavity by an annular water barrier. Drain hole.

Before sizing, 6 groups of cooling water spray rings 7 are arranged and installed on the roller table 2 before sizing. The height of the cooling device 6 can be adjusted with the height of the sizing entrance roller table to realize the centering cooling of the steel pipe. The cooling water spray ring 7 is composed of an upper water spray ring 74 and a lower water spray ring 75 with an inner diameter of 720mm arranged symmetrically up and down; 8 rows of cooling nozzles are evenly arranged on the inner surface of the water spray ring, and the number of cooling nozzles in a single row is 38 One, the water pressure adjustment range of the water spray ring is 0.2～0.8MPa, the flow rate of the upper and lower water spray rings 75 can be independently controlled, the spray water flow range is 80～240m3/h, and the water ratio of the upper and lower spray rings is within the range of 1.05～1.5.

The cooling device 6 is installed on the roller table 3 after the sizing. The height of the cooling device 6 can be adjusted with the height of the roller table 3 after the sizing to realize the centering cooling of the steel pipe. The cooling device 6 is composed of 6 cooling water spray rings 7 with cooling spray The water ring 7 is composed of an upper water spray ring 74 and a lower water spray ring 75 with an inner diameter of 660mm arranged symmetrically up and down; 7 rows of cooling nozzles are evenly arranged in the width direction of the inner surface of the water spray ring, and the water pressure of the water spray ring is adjusted The range is 0.2～0.8MPa, the upper and lower spray ring flow can be independently controlled, the spray water flow range is 80～220m3/h, and the upper and lower spray ring water ratio is in the range of 1.05～1.5;

The cooling device 6 is arranged at the cooling roller table 5 (inclined roller table) between the hot-rolled seamless steel pipe sizing machine 1 and the cooling bed 4. The cooling device 6 is composed of 42 cooling water spray rings 7, and the cooling water spray ring 7 is composed of The upper half of the water spray ring 74 and the lower half of the water spray ring 75 are arranged symmetrically with an inner diameter of 600mm; 3 rows of cooling nozzles are evenly arranged on the inner surface of the water spray ring, and the water pressure adjustment range of the water spray ring is 0.2～0.8MPa , The flow rate of the upper and lower spray rings can be independently controlled, the spray water flow range is 30～180m3/h, and the water ratio of the upper and lower spray rings is within the range of 1.05～1.5. The cooling device 6 is installed and driven by the hydraulic device to realize the height adjustment of the spray ring to ensure the steel pipe alignment. Medium cooling.

In the process of producing Q345B steel pipe with outer diameter of 456mm and wall thickness of 45mm, the temperature of the steel pipe is 1090℃ after continuous rolling, and the temperature of the cold control steel pipe is controlled between 1040～1060℃ through the cooling device 6 before sizing. After the steel pipe is sized, the cooling header opening quantity, water volume and pressure are adjusted by the cooling device 6 after sizing, and the temperature of the steel pipe after cooling is controlled at 960℃. When the cooling device 6 between the beds 4, the opening and cooling temperature is 940℃, by adjusting the running speed of the roller table to 1.0m/s, adjusting the number of opening of the water spray ring, the water volume and pressure control the temperature of the steel pipe after cooling at 630℃, The revolving arm (10, 11) is turned over to the cooling bed 4 and cooled to room temperature. After testing, the steel pipe has a yield strength of 362MPa, a tensile strength of 523MPa, and an elongation of 28.7%. This makes the mechanical properties of the steel pipe meet the performance requirements and realizes the direct rolling of thick gauge steel pipe products. Supply.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features thereof are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. An online cooling system for hot-rolled seamless steel pipes, which is characterized in that it comprises:

   The sizing front roller table and the sizing rear roller table respectively located before and after the sizing machine, the cooling roller table and the cooling device between the cooling bed and the sizing machine;

   The cooling device is arranged at the roller table before sizing, and its height can be adjusted with the height of the roller table before sizing; and/or, the cooling device is arranged at the roller table after sizing, And its height can be adjusted with the height of the roller table after sizing; and/or, the cooling device is arranged at the cooling roller table, and its height is adjusted by a hydraulic drive device;

   The cooling device includes a plurality of cooling water spray rings arranged along the conveying direction of the roller table;

   The outer surface of the cooling water spray ring is provided with a water inlet, and the water inlet is in communication with a branching and collecting pipe through a water supply pipeline and a regulating valve group. The branching and collecting pipe is arranged in parallel with the cooling device, and the branching and collecting pipe is arranged in parallel with the cooling device. The length of is greater than the length of the cooling device;

   The inner wall of the cooling water spray ring is provided with a plurality of rows of evenly distributed cooling nozzles, and an annular partition that divides its inner cavity into a water inlet cavity and a water outlet cavity is provided in the cooling water spray ring. The plate is provided with a through hole, the water inlet cavity and the water outlet cavity are communicated through the through hole, and the flow rate and pressure stability of the cooling water sprayed from the cooling nozzle of the cooling water spray ring are determined by the water inlet The flow rate and the arrangement form and size of the through-flow holes on the annular baffle are controlled;

   The cooling water spray ring includes an upper half water spray ring and a lower water spray ring that are opposite and independent of each other; or, the cooling water spray ring is an integrally connected integral annular water spray ring;

   The annular baffle includes an upper half baffle and a lower half baffle that are opposed to each other, and the upper half baffle and the lower half baffle in turn divide the inner cavities of the upper half water spray ring and the lower half water spray ring respectively. Is the water inlet cavity and the water outlet cavity, the upper and lower partitions are respectively provided with the through holes; or, the annular partition is an integral annular plate-shaped structure, and the integral annular The plate-like structure divides the inner cavity of the integral annular water spray ring into the water inlet cavity and the water outlet cavity, and the integral annular plate-like structure is provided with the flow hole;

   The two ends of the upper half of the water spray ring are respectively provided with a first sewage outlet and a second sewage outlet communicating with the water inlet and outlet chambers, and the middle of the side of the lower half of the water spray ring is provided with the water inlet The third sewage outlet and the fourth sewage outlet communicated with the cavity and the water outlet cavity; or, the middle position of the lower side of the integral annular water spray ring is provided with a fifth sewage outlet communicating with the water inlet cavity and the water outlet cavity respectively And the sixth sewage outlet;

   The first sewage outlet, the second sewage outlet, the third sewage outlet, the fourth sewage outlet, the fifth sewage outlet and the sixth sewage outlet are all buckled with a detachable cover; and/or, the first sewage outlet A sewage valve is provided at the outlet, the second sewage outlet, the third sewage outlet, the fourth sewage outlet, the fifth sewage outlet and the sixth sewage outlet.
2. The online cooling system for hot-rolled seamless steel pipes according to claim 1, characterized in that:

   When the cooling device is arranged at the roller table before the sizing, the inner diameter of the cooling water spray ring is larger than when the cooling device is arranged at the roller table after the sizing and when the cooling device The size of the inner diameter of the cooling water spray ring when it is arranged at the cooling roller table.
3. The online cooling system for hot-rolled seamless steel pipes according to claim 1, characterized in that:

   When the cooling device is arranged at the roller table before the sizing, the number of the cooling water spray ring is 2-8, the inner diameter is 550-720mm, and the cooling nozzles are evenly arranged along the annular inner wall surface. The water pressure adjustment range is 0.2～0.8Mpa, the flow rate range of the upper half water spray ring and the lower half water spray ring are both 80～240m ³ /h, the upper half water spray ring and the lower half The water ratio of the water spray ring is 1.05～1.5; or, the flow rate of the integral annular water spray ring is 160～480m ³ /h, and the water inlet at the upper end of the integral annular water spray ring and the integral annular water spray The water inlet water ratio at the lower end of the ring is 1.05～1.5;

   When the cooling device is arranged at the roller table after the sizing, the number of the cooling water spray ring is 3-10, the inner diameter is 450-660mm, and the cooling nozzles are evenly arranged along the annular inner wall surface. The water pressure adjustment range of the 4-10 rows is 0.2～0.8Mpa; the flow rate range of the upper half water spray ring and the lower half water spray ring are both 80～220m ³ /h, the upper half water spray ring and the lower half The water ratio of the water spray ring is 1.05～1.5; or, the flow rate of the integral annular water spray ring is 160～440m ³ /h, and the water inlet located at the upper end of the integral annular water spray ring and the integral annular water spray The water inlet water ratio at the lower end of the ring is 1.05～1.5;

   When the cooling device is arranged at the cooling roller table, the number of the cooling water spray ring is 30-60, the inner diameter is 450-660mm, and the cooling nozzles are 2 evenly arranged along the annular inner wall. ～8 rows, the water pressure adjustment range is 0.2～0.8Mpa, the flow range of the upper half water spray ring and the lower half water spray ring are both 30～180m ³ /h, the upper half water spray ring and the lower half water spray The annular water ratio is 1.05～1.5; or, the flow rate of the integral annular water spray ring is 60～360m ³ /h, and the water inlet located at the upper end of the integral annular water spray ring and the lower end of the integral annular water spray ring The water inlet water ratio is 1.05～1.5.
4. The online cooling system for hot-rolled seamless steel pipes according to claim 1, characterized in that:

   A plurality of bypass pipelines are communicated with the branch water collection pipe, a pressure regulating valve is arranged on the bypass pipeline, and the outlet of the bypass pipeline is used to communicate with the rolling groove.
5. The online cooling system for hot-rolled seamless steel pipes according to claim 1, characterized in that:

   The length of the diversion header is at least 1.5m greater than the length of the cooling device.
6. A method for arranging a cooling device on a hot-rolled seamless steel pipe on-line cooling system, wherein the hot-rolled seamless steel pipe on-line cooling system is the hot-rolled seamless steel pipe according to any one of claims 1 to 5 Steel pipe online cooling system, the method includes:

   According to the outline process requirements of the hot-rolled seamless steel pipe production line, the cooling device is installed at the roll table before the sizing, the cooling device is installed at the roll table after the sizing, and the cooling device is installed at the cooling roll One or more combinations in the channel to cool the hot-rolled seamless steel pipe.

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