A method and system for free-bonding of hot-rolled perforated L80-13Cr steel grade oil casing guide disc

Abstract

The application discloses a hot-rolled perforated L80-13Cr steel grade oil jacket guide disc free-sticking steel construction method and system, relates to the hot-rolled seamless steel pipe technology field, and systematically solves the guide disc sticking steel problem through sequentially performing the steps of reforming the guide disc cooling water pipeline, adjusting the guide disc height deviation, inserting the carbon steel pipe blank, optimizing the guide disc rotating speed and using the old guide disc rolled through the carbon steel product. The application effectively improves the product outer surface quality, realizes batch continuous production of the L80-13Cr steel grade oil jacket, and significantly improves the yield.

Description

Technical Field

[0001] This invention relates to the field of hot rolling technology for seamless steel pipes, specifically to a non-adhesive steel construction method and system for hot-rolled pierced L80-13Cr grade oil casing guide discs. Background Technology

[0002] L80-13Cr grade oil casing is a steel grade and product specified in the American Petroleum Institute (API) SPEC 5CT standard. Its chemical composition requirements are shown in Table 1. L80-13Cr grade oil casing has a high alloy element content and is one of the more difficult products to manufacture according to the API SPEC 5CT standard. Its chemical composition is shown in the following table: Table 1: Chemical Composition of L80-13Cr Grade Oil Casing Pipes

[0003] To improve production efficiency and reduce production costs, domestic seamless steel pipe manufacturers have adopted continuous rolling mills to mass-produce L80-13Cr grade oil casing. However, due to the significant difference in high-temperature characteristics between L80-13Cr grade oil casing and ordinary carbon steel products, this results in more rolling defects and quality problems, with a yield rate more than 5 percentage points lower than that of ordinary carbon steel products.

[0004] Currently, during the hot rolling and piercing process of L80-13Cr grade oil casing, the problem of steel sticking to the guide plate is prone to occur, such as... Figure 1 As shown. When steel sticking occurs on the guide plate, the sticking guide plate will scratch the outer surface of the steel pipe, resulting in external damage defects and scrap loss, such as... Figure 2 As shown, domestic seamless steel pipe manufacturers have tried various methods, including guide plate lubricants, but none have been very effective in improving the problem of steel sticking to the guide plate. Summary of the Invention

[0005] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to propose a non-sticking steel construction method and system for hot-rolled pierced L80-13Cr grade oil casing guide plates. By modifying the guide plate cooling water pipeline, adjusting the guide plate height deviation, inserting carbon steel billets, optimizing the guide plate rotation speed, and using old guide plates that have been rolled from carbon steel products, the problem of steel sticking to the guide plate can be effectively solved.

[0006] To address the aforementioned problems, this invention provides a non-adhesive steel construction method for hot-rolled perforated L80-13Cr grade oil casing guide discs, comprising: S1. Modify the cooling water pipeline of the guide plate to reduce the risk of steel sticking to the surface of the guide plate at high temperature by optimizing the cooling effect; S2. Adjust the guide plate height deviation and further optimize the contact state between the guide plate and the billet based on the guide plate position after the cooling system modification; S3. Interleaving carbon steel tube blanks: After the height adjustment is completed, the continuous rolling load of L80-13Cr steel grade tube blanks is reduced by interleaving production. S4. Optimize and adjust the guide plate speed to match the billet forward speed, ensuring synchronous movement of the guide plate and the billet under interleaved production conditions; S5. Use old guide discs that have been rolled carbon steel products. By taking advantage of the surface characteristics of the old guide discs, the probability of steel sticking can be further reduced after the rotation speed is optimized.

[0007] Preferably, the modification of the guide plate cooling water pipeline in S1 enhances cooling efficiency and provides a stable temperature environment for the height deviation adjustment in S2, including: a) Redesign the cooling water piping of the guide plate into an arc-shaped pipe; b) The central angle corresponding to the arc-shaped pipe is 90°~150°; c) 10 to 30 cooling water nozzles are distributed on the arc-shaped pipe; d) The pipe is fixed along the outer circumference of the guide plate to ensure that the cooling water evenly covers the surface of the guide plate.

[0008] Preferably, in S2, based on the cooling effect of S1, the contact pressure between the guide plate and the billet is optimized to facilitate the interleaving production in S3. The adjustment of the guide plate height deviation in S2 includes: a) Set the standard value for the height deviation between the high-position guide plate and the low-position guide plate to e; b) Add a guide plate shim under the high-position guide plate; c) The thickness of the guide plate shim is 2~10mm, so that the adjusted height deviation e'=e+(2~10mm); d) Adjust the position of the perforated rollers synchronously and proportionally, raising the upper and lower rollers by 1~5mm.

[0009] Preferably, the intercalation of carbon steel tube blanks in S3 utilizes the guide plate height adjustment in S2 to reduce the continuous rolling time of L80-13Cr tube blanks, providing intermittent production conditions for the speed optimization in S4, including: a) L80-13Cr grade oil casing products and ordinary carbon steel products are produced in an interleaved manner; b) The interleaving method is to produce two L80-13Cr steel grade tube blanks continuously after producing one ordinary carbon steel tube blank, and then repeat the process. c) The length of ordinary carbon steel pipe blanks is 100~500mm longer than that of L80-13Cr steel grade pipe blanks.

[0010] Preferably, the optimized adjustment of the guide plate speed in S4 includes: matching the edge linear velocity V of the guide plate with the billet forward speed V of the billet, satisfying 1.1V of the billet ≤ V of the guide plate ≤ 1.9V of the billet; This speed adjustment is based on the interleaving rhythm of S3 to ensure that the guide plate and billet speed are synchronized, providing stable operating conditions for S5 to use the old guide plate.

[0011] Preferably, in S5, the old guide discs used for rolling carbon steel products are required to have produced no less than 1,000 carbon steel products using the old guide discs. This is to take advantage of the surface hardening characteristics of the old guide discs and, after the speed optimization in S4, further reduce the risk of steel sticking and complete the closed-loop control of the entire construction method.

[0012] A construction system used in a non-adhesive steel construction method for hot-rolled pierced L80-13Cr grade oil casing guide discs includes a guide disc, cooling water pipelines, piercing roller assembly, and billet conveying device. The components work collaboratively through structural connections and positional coordination. Guide plates: The high-position guide plate and the low-position guide plate are set to be symmetrically arranged. The two are positioned by the height deviation value e', where e' is based on the adjustment of shims; Cooling water piping: adopts an arc-shaped pipe structure, fixedly connected along the outer circumference of the guide plate, with a central angle of 90°~150°, and 10~30 cooling water nozzles are distributed, with the nozzles facing the surface of the guide plate; Perforated roller assembly: includes a perforated roller and a main drive shaft for the perforated roller. The perforated roller is positioned corresponding to the guide plate and is driven by the drive shaft. The height of the perforated roller is adjustable and synchronized with the height deviation of the guide plate. The billet conveying device is used to convey ordinary carbon steel billets and L80-13Cr steel grade billets. The billet moves forward along the gap between the guide plate and the piercing roller and is positioned by the mandrel. The cooling water pipes are fixedly connected to the guide plate by a bracket, the piercing rollers are connected to the drive shaft by a keyway, and the height deviation of the guide plate is mechanically adjusted by shims. The whole system constitutes a closed hot rolling piercing environment.

[0013] Preferably, the arc-shaped cooling water pipe is made of stainless steel and is fixed to the outer support of the guide plate by bolts. The nozzle spacing is uniform and the nozzle outlet direction forms an angle of 15° to 30° with the tangent of the guide plate surface to ensure that there are no dead corners in the cooling water coverage.

[0014] Preferably, the height deviation adjustment mechanism for the high-position guide plate and the low-position guide plate includes a replaceable shim set with a shim thickness of 2~10mm. The shims are placed between the guide plate base and the frame and connected by threaded fasteners. At the same time, the height adjustment of the perforated roller is achieved through a worm gear mechanism, which is synchronized with the guide plate adjustment.

[0015] Preferably, the billet conveying device includes a roller conveyor and a billet pusher. Ordinary carbon steel billets and L80-13Cr steel grade billets are arranged alternately, with a billet length difference of 100~500mm. The conveying speed and the guide plate speed are matched by a PLC control system to realize automated interleaving production.

[0016] The advantages of this invention compared to the prior art are: 1. Through systematic process optimization, the problem of steel sticking to the guide plate during the production of hot-rolled pierced L80-13Cr grade oil casing has been effectively solved; 2. The produced L80-13Cr steel grade oil casing products have no defects on the outer surface, and the yield rate is significantly improved; 3. To achieve stable batch continuous hot rolling production of L80-13Cr grade oil casing products and reduce production costs; 4. The construction system has a reasonable structure, is easy to implement and maintain, and is suitable for industrial production. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 Photographs of steel-bonded guide discs in existing technology; Figure 2 This refers to the external damage defects in steel pipes produced after steel is adhered to the guide plate in existing technologies. Figure 3 This is a schematic diagram of the system connection structure of the present invention; Figure 4 This is a diagram of the modified guide plate cooling water pipeline in this invention; Figure 5 This is a schematic diagram of the guide plate height deviation adjustment in this invention; Figure 6 This is a schematic diagram of the interlacing of stainless steel and carbon steel tube blanks in this invention.

[0019] In the figure: 1-Guide plate; 2-Cooling water pipe; 3-Piercing roller; 4-Piercing roller main drive shaft; 5-Low guide plate; 6-High guide plate; 7-Master head; 8-Height deviation; 9-Ordinary carbon steel tube blank; 10-L80-13Cr steel grade tube blank. Detailed Implementation

[0020] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] To address the aforementioned problems, this invention provides a non-adhesive steel construction method for hot-rolled perforated L80-13Cr grade oil casing guide discs, comprising: S1. Modify the cooling water pipeline of the guide plate to reduce the risk of steel sticking to the surface of the guide plate at high temperature by optimizing the cooling effect; S2. Adjust the guide plate height deviation by 8. Based on the guide plate position after the cooling system modification, further optimize the contact state between the guide plate and the billet. S3. After the height adjustment is completed, the continuous rolling load of L80-13Cr steel grade tube blanks is reduced by interleaving production; S4. Optimize and adjust the guide plate speed to match the billet forward speed, ensuring synchronous movement of the guide plate and the billet under interleaved production conditions; S5. Use old guide discs that have been rolled carbon steel products. By taking advantage of the surface characteristics of the old guide discs, the probability of steel sticking can be further reduced after the rotation speed is optimized.

[0024] Preferably, the modification of the guide plate cooling water pipeline in S1 enhances cooling efficiency and provides a stable temperature environment for the height deviation adjustment in S2, including: a) Redesign the cooling water piping of the guide plate into an arc-shaped pipe; b) The central angle corresponding to the arc-shaped pipe is 90°~150°; c) 10 to 30 cooling water nozzles are distributed on the arc-shaped pipe; d) The pipe is fixed along the outer circumference of the guide plate to ensure that the cooling water evenly covers the surface of the guide plate.

[0025] Preferably, in S2, based on the cooling effect of S1, the contact pressure between the guide plate and the billet is optimized to facilitate the interleaving production in S3. The adjustment of the guide plate height deviation in S2 includes: a) Set the standard value for the height deviation between the high-position guide plate and the low-position guide plate to e; b) Add a guide plate shim under the high-position guide plate; c) The thickness of the guide plate shim is 2~10mm, so that the adjusted height deviation e'=e+(2~10mm); d) Adjust the position of the perforated rollers synchronously and proportionally, raising the upper and lower rollers by 1~5mm.

[0026] Preferably, the intercalation of carbon steel tube blanks in S3 utilizes the guide plate height adjustment in S2 to reduce the continuous rolling time of L80-13Cr tube blanks, providing intermittent production conditions for the speed optimization in S4, including: a) Produce L80-13Cr grade oil casing products and ordinary carbon steel products in an interleaved manner; b) The interleaving method is to produce two L80-13Cr steel grade tube blanks continuously after producing one ordinary carbon steel tube blank, and then repeat the process. c) The length of ordinary carbon steel pipe blanks is 100~500mm longer than that of L80-13Cr steel grade pipe blanks.

[0027] Preferably, the optimized adjustment of the guide plate speed in S4 includes: matching the edge linear velocity V of the guide plate with the billet forward speed V of the billet, satisfying 1.1V of the billet ≤ V of the guide plate ≤ 1.9V of the billet; This speed adjustment is based on the interleaving rhythm of S3 to ensure that the guide plate and billet speed are synchronized, providing stable operating conditions for S5 to use the old guide plate.

[0028] Preferably, in S5, the old guide discs used for rolling carbon steel products are required to have produced no less than 1,000 carbon steel products using the old guide discs. This is to take advantage of the surface hardening characteristics of the old guide discs and, after the speed optimization in S4, further reduce the risk of steel sticking and complete the closed-loop control of the entire construction method.

[0029] A construction system used in a non-adhesive steel construction method for hot-rolled pierced L80-13Cr grade oil casing guide discs includes a guide disc, cooling water pipelines, piercing roller assembly, and billet conveying device. The components work collaboratively through structural connections and positional coordination. Guide plate 1: The high guide plate 6 and the low guide plate 5 are arranged symmetrically and are positioned by a height deviation value e', where e' is based on shim adjustment; Cooling water pipe 2: adopts an arc-shaped pipe structure, fixedly connected along the outer side of the guide plate 1, with a central angle of 90°~150°, and 10~30 cooling water nozzles are distributed there, with the nozzles facing the surface of the guide plate; Perforated roller assembly: includes perforated roller 3 and perforated roller main drive shaft 4. The perforated roller 3 is positioned corresponding to the guide plate 1 and is driven by the drive shaft 4. The height of the perforated roller is adjustable and synchronized with the height deviation of the guide plate. The billet conveying device is used to convey ordinary carbon steel billet 9 and L80-13Cr steel grade billet 10. The billet advances along the gap between the guide plate and the piercing roller and is positioned by the mandrel 7. The cooling water pipe 2 is fixedly connected to the guide plate 1 by a bracket, the piercing roller 3 is connected to the drive shaft 4 by a keyway, and the height deviation of the guide plate is mechanically adjusted by a shim. The whole system constitutes a closed hot rolling piercing environment.

[0030] Preferably, the arc-shaped pipe of the cooling water pipe 2 is made of stainless steel. The pipe is fixed to the outer support of the guide plate by bolts. The nozzle spacing is uniform, and the nozzle outlet direction forms an angle of 15° to 30° with the tangent of the guide plate surface to ensure that there are no dead corners in the cooling water coverage.

[0031] Preferably, the height deviation adjustment mechanism of the high-position guide plate 6 and the low-position guide plate 5 includes a replaceable shim set with a shim thickness of 2~10mm. The shims are placed between the guide plate base and the frame and connected by threaded fasteners. At the same time, the height adjustment of the perforated roller 3 is achieved through a worm gear mechanism, which is synchronized with the guide plate adjustment.

[0032] Preferably, the billet conveying device includes a roller conveyor and a billet pusher. Ordinary carbon steel billet 9 and L80-13Cr steel grade billet 10 are arranged alternately, with a billet length difference of 100~500mm. The conveying speed and the guide plate speed are matched by a PLC control system to realize automated interleaving production.

[0033] To more clearly illustrate the specific embodiments of the present invention, an example is provided below: The construction steps of this invention are executed sequentially, wherein S1 provides cooling for S2, S2 provides a position reference for S3, S3 provides the production rhythm for S4, and S4 provides speed matching for S5, ultimately achieving a systematic solution to the problem of guide plate sticking to steel. The specific construction steps are as follows: S1. Modify the cooling water piping of the guide plate: a) Redesign the guide plate cooling water piping to be an arc-shaped pipe; b) The central angle corresponding to the arc-shaped pipe is set to 120°; c) Twenty cooling water nozzles are distributed on the arc-shaped pipe; d) The pipe is fixed along the outer circumference of the guide plate to ensure that the cooling water evenly covers the surface of the guide plate. Figure 4 As shown.

[0034] S2. Adjust guide plate height deviation: a) The standard value for the height deviation between the high-position guide plate and the low-position guide plate is e; b) Add a guide plate shim under the high-position guide plate; c) The thickness of the guide plate shim is increased to 8mm, so that the adjusted height deviation e'=e+8mm is achieved; d) Synchronously adjust the position of the piercing rollers proportionally, raising the upper and lower rollers by 4mm simultaneously. Figure 5 As shown.

[0035] S3. Inserted carbon steel tube blank: a) L80-13Cr grade oil casing products and ordinary carbon steel products are produced in an interleaved manner; b) The specific method of production is to produce two L80-13Cr steel grade billets after producing one ordinary carbon steel billet, and then repeat the process. c) The billet length of ordinary carbon steel tube blanks is 200 mm longer than that of L80-13Cr steel grade tube blanks, such as Figure 6 As shown.

[0036] S4. Optimize and adjust the guide plate speed: a) Match the edge linear velocity V_guide_disk with the billet forward speed V_billet, and set V_guide_disk = 1.3V_billet to ensure speed synchronization.

[0037] S5. Used guide discs from rolled carbon steel products: a) Used old guide discs that have been used to produce 10,000 carbon steel products were used to reduce the risk of steel sticking by utilizing their surface hardening properties.

[0038] In the construction system of this invention, all components work together: 1. The guide plate adjusts the height deviation using shims, and the perforated roller is adjusted synchronously using a worm gear mechanism; 2. The cooling water flow rate is controlled by a PLC to ensure uniform temperature on the guide plate surface; 3. The billet conveying device automatically and alternately conveys carbon steel and stainless steel billets, realizing automated interleaving production.

[0039] Finally, any aspects not fully described in this invention utilize existing mature products and technologies.

[0040] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A non-adhesive steel construction method for hot-rolled perforated L80-13Cr grade oil casing guide discs, characterized in that, include: S1. Modify the cooling water pipeline of the guide plate to reduce the risk of steel sticking to the surface of the guide plate at high temperature by optimizing the cooling effect; The modification of the cooling water pipeline in S1 enhances cooling efficiency and provides a stable temperature environment for the height deviation adjustment in S2, including: a) Redesign the cooling water piping of the guide plate into an arc-shaped pipe; b) The central angle corresponding to the arc-shaped pipe is 90°~150°; c) The arc-shaped pipe has 10 to 30 cooling water nozzles distributed on it; d) The pipe is fixed along the outer circumference of the guide plate to ensure that the cooling water evenly covers the surface of the guide plate; S2. Adjust the guide plate height deviation and optimize the contact state between the guide plate and the tube blank based on the guide plate position after the cooling system modification; Based on the cooling effect of S1, S2 optimizes the contact pressure between the guide plate and the billet to facilitate the interleaving production in S3. The adjustment of the guide plate height deviation in S2 includes: a) Set the standard value for the height deviation between the high-position guide plate and the low-position guide plate to e; b) Add a guide plate shim under the high-position guide plate; c) The thickness of the guide plate shim is 2~10mm, so that the adjusted height deviation e'=e+(2~10mm); d) Adjust the position of the perforating rollers synchronously and proportionally, raising the upper and lower rollers by 1~5mm simultaneously; S3. After the height adjustment is completed, the continuous rolling load of L80-13Cr steel grade tube blanks is reduced by interleaving production; The intercalation of carbon steel tube blanks in S3 utilizes the guide plate height adjustment in S2 to reduce the continuous rolling time of L80-13Cr tube blanks, providing intermittent production conditions for the speed optimization in S4, including: a) Produce L80-13Cr grade oil casing products and ordinary carbon steel products in an interleaved manner; b) The interleaving method is to produce two L80-13Cr steel grade tube blanks continuously after producing one ordinary carbon steel tube blank, and then repeat the process. c) The length of ordinary carbon steel pipe blanks is 100~500mm longer than that of L80-13Cr steel grade pipe blanks; S4. Optimize and adjust the guide plate speed to match the billet forward speed, ensuring synchronous movement of the guide plate and the billet under interleaved production conditions; The optimized adjustment of the guide plate speed in S4 includes: matching the edge linear velocity V of the guide plate with the billet forward speed V of the billet, satisfying 1.1V of the billet ≤ V of the guide plate ≤ 1.9V of the billet; This speed adjustment is based on the interlacing rhythm of S3 to ensure that the guide plate and the billet speed are synchronized, providing stable operating conditions for S5 to use the old guide plate; S5. Use old guide discs that have been rolled carbon steel products. By taking advantage of the surface characteristics of the old guide discs, the probability of steel sticking is reduced after the speed is optimized. The use of old guide discs that have been used to produce carbon steel products in S5 requires that the old guide discs have been used to produce no less than 1,000 carbon steel products. This is to take advantage of the surface hardening characteristics of the old guide discs, reduce the risk of steel sticking after the speed optimization in S4, and complete the closed-loop control of the entire construction method.

2. A construction system used in the non-adhesive steel construction method for hot-rolled pierced L80-13Cr grade oil casing guide discs as described in claim 1, characterized in that: Including guide plates, cooling water pipes, piercing roller assemblies, and billet conveying devices, the components work together through structural connections and positional coordination: Guide plate (1): The high-position guide plate (6) and the low-position guide plate (5) are set to be symmetrically arranged. The two are positioned by the height deviation value e', where e' is based on the adjustment of the shims; Cooling water pipe (2): adopts a circular arc pipe structure, fixedly connected along the outer side of the guide plate (1), the central angle of the pipe is 90°~150°, and there are 10~30 cooling water nozzles distributed, with the nozzles facing the surface of the guide plate; The perforated roller assembly includes a perforated roller (3) and a perforated roller main drive shaft (4). The perforated roller (3) is positioned corresponding to the guide plate (1) and is driven by the drive shaft (4). The height of the perforated roller is adjustable and is synchronized with the height deviation of the guide plate. Tube blank conveying device: used to convey ordinary carbon steel tube blank (9) and L80-13Cr steel grade tube blank (10). The tube blank moves forward along the gap between the guide plate and the piercing roller and is positioned by the mandrel (7). Among them, the cooling water pipe (2) and the guide plate (1) are fixedly connected by a bracket, the piercing roller (3) and the drive shaft (4) are connected by a keyway, and the height deviation of the guide plate is mechanically adjusted by a shim. The whole system constitutes a closed hot rolling piercing environment.

3. The construction system according to claim 2, characterized in that: The arc-shaped pipe of the cooling water pipeline (2) is made of stainless steel. The pipe is fixed to the outer support of the guide plate by bolts. The nozzle spacing is uniform, and the nozzle outlet direction is at an angle of 15°~30° with the tangent of the guide plate surface to ensure that the cooling water coverage is without dead corners.

4. The construction system according to claim 2, characterized in that: The height deviation adjustment mechanism of the high-position guide plate (6) and the low-position guide plate (5) includes a replaceable shim set with a shim thickness of 2~10mm. The shim is placed between the guide plate base and the frame and connected by threaded fasteners. At the same time, the height adjustment of the perforated roller (3) is achieved through a worm gear mechanism, which is synchronized with the guide plate adjustment.

5. The construction system according to claim 2, characterized in that: The billet conveying device includes a roller conveyor and a billet pusher. Ordinary carbon steel billets (9) and L80-13Cr steel grade billets (10) are arranged alternately, with a billet length difference of 100~500mm. The conveying speed and the guide plate speed are matched by a PLC control system to realize automated interleaving production.

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