Fe-ni-cr high-temperature alloy pipe casting device and continuous casting method thereof

Abstract

The application discloses a Fe-Ni-Cr high-temperature alloy pipe casting device and a continuous casting method thereof, which comprises a casting support frame, a heat preservation furnace is arranged on the casting support frame, an induction heating heat preservation mechanism is arranged on the outer side of the alloy melt inlet of the heat preservation furnace, a boron nitride casting mechanism is arranged on the heat preservation furnace, a graphite cooling mechanism is arranged on the upper end of the boron nitride casting mechanism, a water-cooled copper sleeve is arranged on the outer side of the graphite cooling mechanism, and the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace is processed into Fe-Ni-Cr high-temperature alloy pipe through the boron nitride casting mechanism. The application adopts directional solidification, does not need a core material, has simple device and no welding seam, has less grain boundary, has very high corrosion resistance, greatly reduces the risks of pipe fracture, insufficient filling, unstable pipe forming and core material fracture in the pipe continuous casting process, and has very important significance for improving the efficiency and quality of the continuous casting pipe product.

Description

Technical Field

[0001] This invention belongs to the field of alloy pipe processing technology, specifically relating to a casting device for Fe-Ni-Cr high-temperature alloy pipes and its continuous casting method. Background Technology

[0002] Fe-Ni-Cr alloy is an age-hardening, high-strength, high-temperature corrosion-resistant alloy widely used in oil and gas, chemical, and marine engineering fields. However, due to the complex alloy composition of Fe-Ni-Cr high-temperature corrosion-resistant alloy pipes, difficulties in processing deformation, severe segregation, and long production processes, it is difficult to mass-produce high-quality high-temperature alloy pipes, resulting in low efficiency. Producing pipes with special properties and special lengths is even more difficult to guarantee in terms of quality, and it is difficult for technicians to control the overall performance regulation of the pipes.

[0003] Currently, traditional high-temperature alloy seamless tubes are mainly produced using methods such as "centrifugal casting of tube blanks - welding and assembly - multi-pass cold rolling - annealing", "melting - homogenization annealing - forging and billet preparation - hot extrusion - multi-pass cold rolling - intermediate annealing", and "melting - homogenization annealing - ingot preparation - piercing - spinning - annealing". However, these traditional methods involve a large number of related equipment and are prone to the following problems: 1. Using centrifugal casting and welding to prepare tube blanks results in uneven composition distribution, making it difficult to guarantee tube performance and preventing the direct production of longer high-temperature alloy tube profiles; 2. Cold forming of high-temperature alloys is difficult, and hot extrusion process parameters are difficult to control; 3. Hot-pierced tube blanks are prone to cracking or even breakage, and mechanical drilling is difficult to guarantee coaxiality when the blank is long, resulting in inconsistent piercing quality and low production efficiency.

[0004] Furthermore, most casting equipment used for producing high-temperature alloy pipes is not an integrated continuous casting equipment. The inner lining material of the crystallizer in the continuous casting equipment for hollow pipes is graphite. Graphite is prone to react with Cr metal element, which not only damages the graphite crystallizer but also affects the casting itself. Therefore, current casting equipment is difficult to meet the requirements of high-temperature alloy continuous casting and cannot be applied to the continuous casting of high-temperature alloy pipes. To address this, we propose a casting device for Fe-Ni-Cr high-temperature alloy pipes and its continuous casting method. Summary of the Invention

[0005] The purpose of this invention is to provide a casting mold device and continuous casting method for Fe-Ni-Cr high-temperature alloy pipes. It adopts directional solidification, eliminates the need for core materials, and features a simple device without welds, fewer grain boundaries, and high corrosion resistance. This greatly reduces the risks of pipe breakage, insufficient filling, unstable pipe forming, and core material breakage during the continuous casting process, thereby improving the production efficiency, quality, and stability of Fe-Ni-Cr high-temperature corrosion-resistant alloy pipes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a casting device for Fe-Ni-Cr high-temperature alloy pipes, comprising a casting support frame, a holding furnace being provided on the casting support frame, an alloy melt inlet and an alloy pipe traction port being provided on the holding furnace, an induction heating and heat preservation mechanism being provided on the outside of the alloy melt inlet, and Fe-Ni-Cr high-temperature alloy melt being added into the holding furnace through a casting furnace; A boron nitride casting mechanism is provided on the inner side of the holding furnace corresponding to the traction port of the alloy tube. A graphite cooling mechanism connected to the casting support frame is provided at the upper end of the boron nitride casting mechanism. A water-cooled copper sleeve is provided on the outer side of the graphite cooling mechanism. The Fe-Ni-Cr high-temperature alloy melt in the holding furnace is continuously cast into Fe-Ni-Cr high-temperature alloy tubes through the boron nitride casting mechanism. The Fe-Ni-Cr high-temperature alloy tubes are cooled by the graphite cooling mechanism and the water-cooled copper sleeve, and are continuously drawn to a specified length by the traction mechanism to complete the continuous casting process of the Fe-Ni-Cr high-temperature alloy tubes.

[0007] Preferably, the holding furnace is equipped with a liquid level and temperature detection mechanism at the position corresponding to the alloy melt inlet.

[0008] Preferably, the boron nitride casting mechanism is a composite casting mechanism made of copper, boron nitride, and graphite.

[0009] Preferably, the water-cooled copper sleeve is externally connected to a cooling circulation system, and a cooling medium circulates within the water-cooled copper sleeve.

[0010] A continuous casting method for Fe-Ni-Cr high-temperature alloy pipe casting molds includes the following steps: A: Preheat the holding furnace and boron nitride casting mechanism to the set temperature, then insert the boron nitride casting mechanism into the inside of the alloy pipe traction port in the holding furnace, and then inject cooling medium into the water-cooled copper jacket through the cooling circulation system. B: Then turn on the induction heating and heat preservation mechanism, and then transfer the molten Fe-Ni-Cr high-temperature alloy melt through the casting furnace into the heat preservation furnace. The induction heating and heat preservation mechanism heats and preserves the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace, keeping the temperature of the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace within the set temperature range. C: Then turn on the liquid level and temperature detection mechanism. The liquid level and temperature detection mechanism will detect the liquid level and temperature of the Fe-Ni-Cr high-temperature alloy melt in the holding furnace in real time and keep the liquid level and temperature of the Fe-Ni-Cr high-temperature alloy melt in the holding furnace above the low warning value. D: The Fe-Ni-Cr high-temperature alloy melt flows and contacts the boron nitride casting mechanism in the holding furnace. According to the required thickness of the Fe-Ni-Cr high-temperature alloy tube, the Fe-Ni-Cr high-temperature alloy melt stays in the boron nitride casting mechanism for a period of time. Then, the Fe-Ni-Cr high-temperature alloy melt crystallizes and solidifies in the boron nitride casting mechanism to form a columnar crystal shell of the required thickness. Then, the columnar crystal shell is cooled by a graphite cooling mechanism and a water-cooled copper sleeve and extends out from the alloy tube traction port. E: Then start the traction mechanism, and use the traction mechanism to draw the columnar crystal shell into Fe-Ni-Cr high temperature alloy tube at a constant speed. Then the traction mechanism continues to pull, and the Fe-Ni-Cr high temperature alloy melt is continuously replenished into the holding furnace through the casting furnace, keeping the Fe-Ni-Cr high temperature alloy melt level in the holding furnace above the low warning value. F: When the traction mechanism pulls the Fe-Ni-Cr high-temperature alloy pipe to the required length, stop adding Fe-Ni-Cr high-temperature alloy melt into the holding furnace, cut the Fe-Ni-Cr high-temperature alloy pipe, and then proceed to the next process.

[0011] Preferably, in step A, the holding furnace and the boron nitride casting mechanism are preheated by the incandescent method, the preheating set temperature of the holding furnace is 1150-1300℃, and the preheating set temperature of the boron nitride casting mechanism is 1000-1100℃.

[0012] Preferably, in step A, the flow rate of the cooling medium inside the water-cooled copper bushing is 750-850 L / h, and the temperature of the cooling medium inside the water-cooled copper bushing is 20-25℃.

[0013] Preferably, in step B, the temperature of the Fe-Ni-Cr high-temperature alloy melt in the casting furnace is 1750-1800℃.

[0014] Preferably, in step B, the temperature of the Fe-Ni-Cr high-temperature alloy melt in the holding furnace is 1450-1500℃.

[0015] Preferably, in step E, the traction speed of the traction mechanism is 30-40 mm / min.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The Fe-Ni-Cr high-temperature alloy pipe casting device of this invention uses an upward continuous casting method and a boron nitride casting mechanism to continuously cast Fe-Ni-Cr high-temperature alloy pipes. This effectively solves the problem of Fe and Cr alloying elements reacting with traditional graphite casting mechanisms during the upward continuous casting process of Fe-Ni-Cr high-temperature alloy pipes. It employs a boron nitride casting mechanism combining copper, boron nitride, and graphite for upward continuous casting of Fe-Ni-Cr high-temperature alloy pipes. Boron nitride is injected into the alloy melt, causing the melt to crystallize and solidify, forming a columnar crystal shell that is directionally solidified along the continuous casting direction. The shell is then directly drawn upward to form the pipe, eliminating the need for additional casting equipment. When assembled into a core material, boron nitride does not react with elements such as Fe and Cr when in contact with the melt. The resulting columnar crystal tube has high mechanical properties. Boron nitride is brittle and cannot be rapidly cooled or heated. Preheating boron nitride to 1000℃ promotes the solidification and crystallization of the melt and also forms a temperature gradient with the Fe-Ni-Cr high-temperature alloy melt. After the Fe-Ni-Cr high-temperature alloy melt crystallizes and forms a shell, it is drawn up and rapidly cooled by a combination of water-cooled copper sleeve and graphite cooling mechanism. This method can directly produce directionally solidified columnar crystal Fe-Ni-Cr high-temperature alloy tubes with fewer grain boundaries, high corrosion resistance, and greatly improve production efficiency. 2. This invention employs a continuous directional solidification technology, which differs from traditional cold casting, to prepare Fe-Ni-Cr high-temperature alloy pipes with high orientation along the continuous casting direction. It can fully utilize the columnar crystal structure of the material and reduce the cold deformation resistance of the alloy, thereby achieving the preparation of high-yield, high-efficiency, and high-quality and stable seamless high-temperature alloy pipes. The method is simple and requires little human intervention. 3. The production method of Fe-Ni-Cr high-temperature alloy pipe based on composite mold upward continuous casting proposed in this invention does not require core material, simplifies the crystallizer, reduces the process flow, and is simple to operate. It can directly produce Fe-Ni-Cr high-temperature alloy pipe, which greatly reduces the risks of pipe breakage, insufficient filling, unstable pipe forming and core material breakage in the continuous casting process. It is of great significance for improving the efficiency and quality of continuous casting pipe products. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the Fe-Ni-Cr high-temperature alloy pipe casting device of the present invention; Figure 2 This is a schematic diagram of the continuous casting process of the Fe-Ni-Cr high-temperature alloy pipe casting device of the present invention.

[0018] In the diagram: 1. Casting mold support frame; 2. Insulation furnace; 201. Alloy melt inlet; 202. Alloy pipe traction port; 3. Induction heating and insulation mechanism; 4. Casting furnace; 5. Boron nitride casting mold mechanism; 6. Graphite cooling mechanism; 7. Water-cooled copper sleeve; 8. Fe-Ni-Cr high-temperature alloy pipe; 9. Traction mechanism; 10. Liquid level and temperature detection mechanism. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-2 The Fe-Ni-Cr high-temperature alloy pipe casting device provided by the present invention includes a casting support frame 1, a holding furnace 2 is provided on the casting support frame 1, an alloy melt inlet 201 and an alloy pipe traction port 202 are provided on the holding furnace 2, an induction heating and holding mechanism 3 is provided on the outside of the holding furnace 2 corresponding to the alloy melt inlet 201, Fe-Ni-Cr high-temperature alloy melt is added into the holding furnace 2 through the alloy melt inlet 201 via a casting furnace 4, and a liquid level and temperature detection mechanism 10 is provided on the holding furnace 2 at the position corresponding to the alloy melt inlet 201. A boron nitride casting mechanism 5 is provided on the inner side of the alloy tube traction port 202 on the holding furnace 2. The boron nitride casting mechanism 5 is a composite casting mechanism made of copper, boron nitride and graphite. A graphite cooling mechanism 6 connected to the casting support frame 1 is provided at the upper end of the boron nitride casting mechanism 5. A water-cooled copper sleeve 7 is provided on the outer side of the graphite cooling mechanism 6. A cooling circulation system is connected to the water-cooled copper sleeve 7. Cooling medium circulates inside the water-cooled copper sleeve 7. The Fe-Ni-Cr high-temperature alloy melt in the holding furnace 2 is continuously cast into Fe-Ni-Cr high-temperature alloy tubes 8 through the boron nitride casting mechanism 5. The Fe-Ni-Cr high-temperature alloy tubes 8 are cooled by the graphite cooling mechanism 6 and the water-cooled copper sleeve 7, and are continuously drawn to the specified length by the traction mechanism 9 to complete the continuous casting process of the Fe-Ni-Cr high-temperature alloy tubes 8.

[0021] In this invention, the Fe-Ni-Cr high-temperature alloy pipe casting device uses an upward continuous casting method and a boron nitride casting mechanism 5 to continuously cast Fe-Ni-Cr high-temperature alloy pipes 8. This effectively solves the problem of Fe and Cr alloying elements reacting with traditional graphite casting mechanisms during the upward continuous casting process of Fe-Ni-Cr high-temperature alloy pipes 8. The device employs a boron nitride casting mechanism 5, which combines copper, boron nitride, and graphite, to continuously cast Fe-Ni-Cr high-temperature alloy pipes 8. Boron nitride is injected into the alloy melt, causing the melt to crystallize and solidify, forming a columnar crystal shell that is directionally solidified along the continuous casting direction. The shell is then directly drawn upwards to form the pipe, eliminating the need for additional casting equipment. When assembled into a core material, boron nitride does not react with elements such as Fe and Cr in contact with the melt. The resulting columnar crystal tube has high mechanical properties. Boron nitride is brittle and cannot be rapidly cooled or heated. Preheating boron nitride to 1000℃ promotes the solidification and crystallization of the melt and also creates a temperature gradient with the Fe-Ni-Cr high-temperature alloy melt. After the Fe-Ni-Cr high-temperature alloy melt crystallizes and forms a shell, it is drawn up and rapidly cooled by a combination of a water-cooled copper sleeve 7 and a graphite cooling mechanism 6. This method can directly produce directionally solidified columnar crystal Fe-Ni-Cr high-temperature alloy tubes 8 with fewer grain boundaries, high corrosion resistance, and greatly improved production efficiency.

[0022] This invention employs a continuous directional solidification technology, which differs from traditional cold casting, to prepare Fe-Ni-Cr high-temperature alloy tubes 8 with high orientation along the continuous casting direction. It can fully utilize the columnar crystal structure of the material and reduce the cold deformation resistance of the alloy, thereby achieving the preparation of high-yield, high-efficiency, and high-quality and stable seamless high-temperature alloy tubes. The method is simple and requires little human intervention.

[0023] In this embodiment, the continuous casting method for preparing Fe-37Ni-15Cr high-temperature alloy pipes with an outer diameter of 40mm and a wall thickness of 4mm includes the following steps: A: The holding furnace 2 and the boron nitride casting mechanism 5 are preheated by the hot spot method. The holding furnace 2 is preheated to 1150℃ and the boron nitride casting mechanism 5 is preheated to 1000℃. Then, the boron nitride casting mechanism 5 is inserted into the inner side of the alloy pipe traction port 202 in the holding furnace 2. Then, the cooling medium is circulated into the water-cooled copper sleeve 7 through the cooling circulation system. The flow rate of the cooling medium in the water-cooled copper sleeve 7 is 800L / h and the temperature of the cooling medium in the water-cooled copper sleeve 7 is 23℃. B: Then, the induction heating and heat preservation mechanism 3 is turned on, and the molten Fe-Ni-Cr high-temperature alloy melt is transferred and injected into the heat preservation furnace 2 through the casting furnace 4. The temperature of the Fe-Ni-Cr high-temperature alloy melt in the casting furnace 4 is 1750℃. The induction heating and heat preservation mechanism 3 heats and preserves the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace 2, keeping the temperature of the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace 2 within the set temperature range. The temperature of the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace 2 is 1450℃. C: Then, the liquid level and temperature detection mechanism 10 is turned on. The liquid level and temperature detection mechanism 10 detects the liquid level and temperature of the Fe-Ni-Cr high-temperature alloy melt in the holding furnace 2 in real time, and keeps the liquid level and temperature of the Fe-Ni-Cr high-temperature alloy melt in the holding furnace 2 above the low warning value, so as to prevent the liquid level and temperature of the Fe-Ni-Cr high-temperature alloy melt in the holding furnace 2 from being too low, causing billet breakage or destroying the directional solidification temperature gradient, which would affect the continuous casting processing of Fe-Ni-Cr high-temperature alloy pipe 8. D: The Fe-Ni-Cr high-temperature alloy melt in the holding furnace 2 flows and contacts the boron nitride casting mold 5. The wall thickness of the Fe-Ni-Cr high-temperature alloy tube 8 to be prepared is 4mm. The Fe-Ni-Cr high-temperature alloy melt stays in the boron nitride casting mold 5 for 54s. Then, the Fe-Ni-Cr high-temperature alloy melt crystallizes and solidifies from bottom to top in the boron nitride casting mold 5 to form a columnar crystal shell of the required thickness. Then, the columnar crystal shell is cooled by the graphite cooling mechanism 6 and the water-cooled copper sleeve 7. The water-cooled copper sleeve 7 first lowers the temperature of the graphite cooling mechanism 6, and then the cooling mechanism 6 cools the columnar crystal shell. The prepared columnar crystal shell has a uniform grain distribution, fewer grain boundaries, high corrosion resistance, and extends out from the alloy tube traction port 202. E: Then start the traction mechanism 9, and use the traction mechanism 9 to draw the columnar crystal shell into Fe-Ni-Cr high-temperature alloy tube 8 at a constant speed. The traction speed of the traction mechanism 9 is 34mm / min. Then the traction mechanism 9 continues to pull, and the Fe-Ni-Cr high-temperature alloy melt is continuously replenished into the holding furnace 2 through the casting furnace 4, keeping the Fe-Ni-Cr high-temperature alloy melt level in the holding furnace 2 above the low warning value. F: When the traction mechanism 9 pulls the Fe-Ni-Cr high-temperature alloy pipe 8 to the required length, stop adding Fe-Ni-Cr high-temperature alloy melt to the holding furnace 2, cut the Fe-Ni-Cr high-temperature alloy pipe 8, and then proceed to the next process for the Fe-Ni-Cr high-temperature alloy pipe 8.

[0024] The performance of the Fe-Ni-Cr high-temperature alloy tube 8 prepared by the present invention and the Fe-Ni-Cr high-temperature alloy tube 8 prepared by the conventional process are compared, as shown in Table 1 below: Table 1: The production method of Fe-Ni-Cr high-temperature alloy pipe 8 based on composite mold upward continuous casting proposed in this invention eliminates the need for core material, simplifies the crystallizer, reduces process flow, and is simple to operate, allowing direct production of Fe-Ni-Cr high-temperature alloy pipe 8. It greatly reduces the risks of pipe breakage, insufficient filling, unstable pipe forming, and core material breakage that exist in the continuous casting process, and is of great significance for improving the efficiency and quality of continuously cast pipe products.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An Fe-Ni-Cr high temperature alloy pipe casting mold device, characterized by, The system includes a casting support frame (1), on which a heat preservation furnace (2) is provided. The heat preservation furnace (2) is provided with an alloy melt inlet (201) and an alloy pipe traction port (202). An induction heating heat preservation mechanism (3) is provided on the outside of the alloy melt inlet (201) of the heat preservation furnace (2). The alloy melt inlet (201) is filled with Fe-Ni-Cr high-temperature alloy melt into the heat preservation furnace (2) through a casting furnace (4). A boron nitride casting mechanism (5) is provided on the inner side of the holding furnace (2) corresponding to the alloy pipe traction port (202). A graphite cooling mechanism (6) connected to the casting support frame (1) is provided at the upper end of the boron nitride casting mechanism (5). A water-cooled copper sleeve (7) is provided on the outer side of the graphite cooling mechanism (6). The Fe-Ni-Cr high-temperature alloy melt in the holding furnace (2) is continuously cast into Fe-Ni-Cr high-temperature alloy pipe (8) by the boron nitride casting mechanism (5). The Fe-Ni-Cr high-temperature alloy pipe (8) is cooled by the graphite cooling mechanism (6) and the water-cooled copper sleeve (7), and is continuously pulled to a specified length by the traction mechanism (9) to complete the continuous casting process of the Fe-Ni-Cr high-temperature alloy pipe (8). The heat preservation furnace (2) is equipped with a liquid level and temperature detection mechanism (10) at the position corresponding to the alloy melt inlet (201). The boron nitride casting mechanism (5) is a composite casting mechanism made of copper, boron nitride and graphite; The water-cooled copper sleeve (7) is connected to a cooling circulation system, and a cooling medium circulates inside the water-cooled copper sleeve (7).

2. The continuous casting method of the Fe-Ni-Cr high-temperature alloy pipe casting mold device according to claim 1, characterized in that, Includes the following steps: A: Preheat the heat preservation furnace (2) and the boron nitride casting mechanism (5), preheat the heat preservation furnace (2) and the boron nitride casting mechanism (5) to the set temperature, then insert the boron nitride casting mechanism (5) into the inner side of the alloy pipe traction port (202) in the heat preservation furnace (2), and then inject the cooling medium into the water-cooled copper sleeve (7) through the cooling circulation system; B: Then turn on the induction heating and heat preservation mechanism (3), and then transfer the molten Fe-Ni-Cr high-temperature alloy melt through the casting furnace (4) into the heat preservation furnace (2). The induction heating and heat preservation mechanism (3) heats and preserves the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace (2) and keeps the temperature of the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace (2) within the set temperature range. C: Then turn on the liquid level and temperature detection mechanism (10). The liquid level and temperature detection mechanism (10) detects the liquid level and temperature of the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace (2) in real time, and keeps the liquid level and temperature of the Fe-Ni-Cr high-temperature alloy melt in the heat preservation furnace (2) above the low warning value. D: The Fe-Ni-Cr high-temperature alloy melt in the holding furnace (2) flows and contacts the boron nitride casting mechanism (5). According to the required thickness of the Fe-Ni-Cr high-temperature alloy tube (8), the Fe-Ni-Cr high-temperature alloy melt stays in the boron nitride casting mechanism (5) for a period of time. Then, the Fe-Ni-Cr high-temperature alloy melt crystallizes and solidifies from bottom to top in the boron nitride casting mechanism (5) to form a columnar crystal shell of the required thickness. Then, the columnar crystal shell is cooled by the graphite cooling mechanism (6) and the water-cooled copper sleeve (7) and extends out from the alloy tube traction port (202). E: Then start the traction mechanism (9), and use the traction mechanism (9) to pull the columnar crystal shell into Fe-Ni-Cr high temperature alloy tube (8) at a constant speed. Then the traction mechanism (9) continues to pull, and the Fe-Ni-Cr high temperature alloy melt is continuously replenished into the heat preservation furnace (2) through the casting furnace (4), so that the Fe-Ni-Cr high temperature alloy melt liquid level in the heat preservation furnace (2) is kept above the low warning value. F: When the traction mechanism (9) pulls the Fe-Ni-Cr high-temperature alloy pipe (8) to the required length, stop adding Fe-Ni-Cr high-temperature alloy melt to the heat preservation furnace (2), cut the Fe-Ni-Cr high-temperature alloy pipe (8), and then proceed to the next process for the Fe-Ni-Cr high-temperature alloy pipe (8).

3. The continuous casting method of the Fe-Ni-Cr high-temperature alloy pipe casting mold device according to claim 2, characterized in that: In step A, the heat preservation furnace (2) and the boron nitride casting mechanism (5) are preheated by the incandescent method. The preheating setting temperature of the heat preservation furnace (2) is 1150-1300℃, and the preheating setting temperature of the boron nitride casting mechanism (5) is 1000-1100℃.

4. The continuous casting method of the Fe-Ni-Cr high-temperature alloy pipe casting mold device according to claim 2, characterized in that: In step A, the flow rate of the cooling medium inside the water-cooled copper sleeve (7) is 750-850 L / h, and the temperature of the cooling medium inside the water-cooled copper sleeve (7) is 20-25℃.

5. The continuous casting method of the Fe-Ni-Cr high-temperature alloy pipe casting mold device according to claim 2, characterized in that: In step B, the temperature of the Fe-Ni-Cr high-temperature alloy melt in the casting furnace (4) is 1750-1800℃.

6. The continuous casting method of the Fe-Ni-Cr high-temperature alloy pipe casting mold device according to claim 2, characterized in that: In step B, the temperature of the Fe-Ni-Cr high-temperature alloy melt in the holding furnace (2) is 1450-1500℃.

7. The continuous casting method of the Fe-Ni-Cr high-temperature alloy pipe casting mold device according to claim 2, characterized in that: In step E, the traction speed of the traction mechanism (9) is 30-40 mm / min.

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