Production process of inconel bar

Abstract

The invention discloses a production technology of an inconel bar. The production technology comprises the following steps that firstly, a 1T vacuum induction furnace is used for smelting, and an electrode bar is cast; step 2, preparation before electroslag remelting; the method comprises the steps of electrode bar surface treatment, dummy ingot block welding and slag material preparation. Step 3, electroslag remelting; fourthly, after the electroslag ingot is completely cooled, the dummy ingot plate needs to be subjected to gas cutting along the bottom diameter; fifthly, cogging is conducted, and upsetting and drawing forging comprises the first heating number and the second heating number; 6, drawing-out forging comprises a third heating number and a fourth heating number, the total deformation of the third heating number is controlled to be 35-45%, and the total deformation of the fourth heating number needs to be larger than or equal to 50%; and seventhly, the bar is subjected to solution annealing. According to the method, the bar meeting the standard requirement is obtained through the low-cost technological process, more uniform equiaxed grains are obtained through the process under the same process, the machining time is shortened while the excellent and beneficial performance is guaranteed, and annealing twin crystals are reduced by adjusting the annealing temperature and time.

Description

Technical Field

[0001] The invention relates to the technical field of rod production, and in particular to a production process of an Inconel rod. Background Art

[0002] Inconel690 alloy, whose main components are nickel, chromium and iron, is widely used in the fields of radioactive material use and treatment, pressure steam generator, heavy oil furnace, etc., because of its stable alloy performance, good corrosion resistance, oxidation resistance, cracking resistance and other properties. It is an important heat transfer tube material for steam generators in nuclear power plants.

[0003] At present, there is a lack of complete Inconel690 bar production process in China. In order to obtain uniform structure and performance, a complete bar manufacturing process of 1T furnace has been developed to manufacture short-process and high-performance Inconel690 bars. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems existing in the production process of the existing Inconel rods, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a production process for Inconel rods, which can obtain rods that meet standard requirements through a low-cost process flow. Under the same process, this process obtains more uniform equiaxed grains, while ensuring excellent performance, reducing processing time, and reducing the generation of annealing twins by adjusting annealing temperature and time.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a production process of inconel rods, comprising the following steps:

[0008] Step 1: Use a 1T vacuum induction furnace to smelt and cast electrode rods. The process includes: charging, smelting, high-temperature inclusion removal, primary refining, adding alloying small materials, secondary refining and cooling casting;

[0009] Step 2: Preparation before electroslag remelting, which includes: electrode rod surface treatment, ingot welding and slag preparation;

[0010] Step 3: electroslag remelting; electroslag remelting includes: arcing and slag, current raising, remelting and shrinkage feeding stages;

[0011] Step 4: After the electroslag ingot is completely cooled, the starter plate needs to be gas cut along the bottom diameter to remove the excess starter plate for subsequent forging;

[0012] Step 5, blanking and forging includes the first and second firings, and the cast structure is fully broken by repeated forging. The temperature of the first firing of blanking is controlled at 1150±10℃, and the temperature is kept for 5-6 hours, and the deformation amount is 35-45%. The second firing ensures that the cast structure is completely broken and supplemented by the diagonal pulling deformation method, so as to obtain a uniform structure;

[0013] Step 6: The drawing forging includes the third and fourth fires. The total deformation of the third fire is controlled at 35-45%, and the total deformation of the fourth fire must be ≥50%, so as to achieve the effect of grain refinement.

[0014] Step 7: Solution annealing of the bar. The annealing furnace should be Class III or above trolley annealing furnace or Class B or above box annealing furnace.

[0015] As a preferred solution of the production process of the inconel rod of the present invention, the step 1 specifically comprises:

[0016] (1) Loading: When loading, first fill half of the carbon into the bottom of the crucible through the charging bucket, lay about 50kg of small nickel plates on the bottom, and use a hot furnace to load: when the vacuum degree is less than 10pa, start to supply power, 150~200kw;

[0017] (2) Material preparation: vacuum degree <10pa, argon is filled to 3kpa before each feeding, material preparation power is 300-400kw, feeding interval is short, and the overall material preparation time is ensured to be ≤2.5h;

[0018] (3) High temperature removal of inclusions: After adding all the main materials, increase the power to 500kw when the molten pool is cleared, raise the molten pool temperature to 1570±10℃, and maintain it for 5 to 10 minutes;

[0019] (4) Primary refining: After the temperature stabilizes at 1490-1530°C, the power is adjusted to 150-200 kW to ensure that the temperature is stable within the refining range, the refining vacuum is ≤5 Pa, and the refining time is 45-60 min;

[0020] (5) Adding alloying small materials: After refining, the power is reduced to 100kw, and after filling with argon gas 3-5kpa, Mn, Si, C, Ti, Al, CrN, B-Fe alloy small materials are slowly added through the upper feeding bin;

[0021] (6) Secondary refining: After the addition is completed, the power is increased to 450 kW until the temperature is maintained within 1470-1510 °C, then the power is reduced to 150 kW and the refining is continued for 20 min. The vacuum degree is ≤3 Pa, otherwise it is extended for 10 min.

[0022] (7) Casting: Fill with argon to 3-5 kPa, adjust the temperature to 1450-1470°C, and pour steel at a slow-fast-slow rate to ensure that there is no interruption in the chute. The mold is a half mold with a Φ295 electrode rod.

[0023] As a preferred solution of the production process of the inconel rod of the present invention, the step 2 specifically includes:

[0024] (1) The surface of the electrode rod after smelting needs to be polished to remove more than 95% of the oxide scale on the surface of the electrode rod. After sawing the electrode rod riser, it is welded with the auxiliary electrode. Then the electrode rod is placed in the mold baking station with a baking temperature of ≥550℃ and baked for more than 4 hours.

[0025] (2) Prepare the ingot starter plate and the arc starter block: Weld the three arc starter blocks to the center of the ingot starter plate and place them there. Prepare the slag material: ESR2702:SR81 = 1:1; 40-45 kg. Place the prepared slag material in a barrel and bake it in a baking station at a temperature of ≥650°C for more than 4 hours.

[0026] As a preferred solution of the production process of the inconel rod of the present invention, the step three comprises:

[0027] (1) After the arc starts, wait until the current stabilizes, then turn on the feeder and add material to the crystallizer;

[0028] (2) Arcing and slag forming stage: current 2000-5500A, voltage 38-51V, time 20-25min;

[0029] (3) Power increase stage: current 6500-7500A, voltage 51-52V, time is about 15-20min;

[0030] (4) Remelting stage: current 7500~8500A, voltage 48±5V, time is about 120~140min;

[0031] (5) Shrinkage compensation stage: current 6500~4000A, voltage 46~43V, time is about 25min.

[0032] As a preferred solution of the production process of the inconel rods described in the present invention, the following steps are adopted: before the remelting in step 3 (1), the baked slag is loaded into the feeder and fixed to the feed port to wait for feeding; if the arc is broken for more than 5 seconds during the arcing and slagging stage, the electrode position is manually adjusted to contact the ingot block to start the arc until the arc is successfully started and then the automatic adjustment is switched; after all the electroslag is remelted in step 3, the mold can be removed after cooling in the crystallizer for at least 30 minutes.

[0033] As a preferred solution for the production process of the Inconel rods described in the present invention, the requirements for step five are: the heating equipment is a natural gas heating furnace of Class IV or above / a box-type resistance furnace of Class B or above, and the forging equipment is a 40MN or above fast forging hydraulic press / a 15T or above electro-hydraulic hammer.

[0034] As a preferred solution of the production process of the Inconel rod of the present invention, the heating system is as follows: slowly heating to 800°C after 8 hours, keeping warm for 2 hours, then heating to 1150±10°C after 3 hours, keeping warm for 5-6 hours, blanking forging: Φ410×900mm, rolling forging one circle to 400×900 in all directions, upsetting to H=560mm, deformation of 37.8%, drawing to 430×770 in all directions, deformation of 27%, upsetting to H=480, deformation of 37.7%, drawing to 430×770 in all directions, deformation of 37.7%, hot material returning to the furnace; returning to the furnace and keeping warm for 2.5-3 hours, the returning furnace temperature is 1100°C;

[0035] The 430×770 in octagonal shape is then upset to H=480mm, with a deformation of 37.7%, drawn to Φ450×590mm, with a deformation of 18.6%, diagonally drawn to 430×770mm in octagonal shape, upset to H=480mm, drawn to Φ450×590mm, with a deformation of 18.6%, diagonally drawn to 430×770mm in octagonal shape, with a cross-sectional deformation of >32.4%, rolled and drawn to Φ400×950mm, with a deformation of 18.9%, and the hot material is returned to the furnace for 2.5 to 3 hours of insulation, and the furnace temperature is: 1100±10℃.

[0036] As a preferred solution of the production process of the inconel rod of the present invention, the specific implementation method of step six is ​​as follows:

[0037] Heating temperature: 1100℃, Φ400×950mm, V anvil drawing to Φ315×1470, deformation 38%, 2-3 times of drawing, hot material return to the furnace, single pressing amount 40-80mm, single feeding amount 80-120mm, strain rate 0.05-0.1s -1 , return to the furnace and keep warm for 2 to 2.5 hours;

[0038] Heating temperature: 1080℃, Φ315×1470, V anvil drawing to Φ215×3270, air cooling, deformation 53.4%, drawing in 3-4 times, if the surface temperature is less than 900℃, it is allowed to return to the furnace for 0.5-1h, the final forging temperature is ≥900℃, and other hot materials are not allowed to be placed within 1m of the air cooling to affect the cooling rate; single pressing amount 30-70mm, single feeding amount 60-140mm, strain rate 0.05-0.1s -1 .

[0039] As a preferred solution of the production process of the inconel rod of the present invention, the solid solution system in the annealing furnace in step seven is:

[0040] System 1: 1075±10℃×4h, WQ;

[0041] Aging system: 715±10℃×10h, AC;

[0042] System 2: 1075±10℃×2.5h, WQ;

[0043] Aging: 715±10℃×12h, AC.

[0044] The beneficial effects of the present invention are as follows: on the basis of reasonable component design, small alloy materials such as Al, CrN, B-Fe, etc. are added to improve the strength, corrosion resistance, thermal strength, thermoplasticity, purity, etc. of the steel, thereby improving the hot working performance during forging. On this basis, electroslag remelting is added to further improve the purity, thermoplasticity, and toughness of the steel ingot, thereby obtaining a steel ingot with uniform structure and dense surface, greatly increasing the yield rate. During the forging process, the cast structure is fully broken by pulling, the comprehensive performance of the bar is improved, and diagonal pulling is interspersed during the pulling process to reduce the forging dead zone during the forging process, slow down the uneven deformation, and obtain good comprehensive performance by controlling the final forging temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0046] Figure 1 The figure is a schematic diagram of the overall process structure of the production process of the inconel rod of the present invention.

[0047] Figure 2 The figure is a schematic diagram of the welding structure of the dummy plate and the dummy block in the production process of the inconel rod of the present invention.

[0048] Figure 3 The figure is a schematic diagram of the appearance of the electroslag ingot of the production process of the inconel rod of the present invention.

[0049] Figure 4 It is a schematic diagram of the organization of the heat treatment system 1 of the production process of the inconel rod of the present invention.

[0050] Figure 5 It is a schematic diagram of the organization of the production process of Inconel rods under heat treatment system 2 of the present invention. DETAILED DESCRIPTION

[0051] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0052] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0053] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0054] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0055] Reference Figure 1 - Figure 4 , a production process of Inconel rods, comprising the following steps:

[0056] Step 1: Use a 1T vacuum induction furnace to smelt and cast electrode rods. The process includes: charging, smelting, high-temperature inclusion removal, primary refining, adding alloying small materials, secondary refining and cooling casting;

[0057] Step 2: Preparation before electroslag remelting, which includes: electrode rod surface treatment, ingot welding and slag preparation;

[0058] Step 3: electroslag remelting; electroslag remelting includes: arcing and slag, current raising, remelting and shrinkage feeding stages;

[0059] Step 4: After the electroslag ingot is completely cooled, the starter plate needs to be gas cut along the bottom diameter to remove the excess starter plate for subsequent forging;

[0060] Step 5, blanking and forging includes the first and second firings, and the cast structure is fully broken by repeated forging. The temperature of the first firing of blanking is controlled at 1150±10℃, and the temperature is kept for 5-6 hours, and the deformation amount is 35-45%. The second firing ensures that the cast structure is completely broken and supplemented by the diagonal pulling deformation method, so as to obtain a uniform structure;

[0061] Step 6: The drawing forging includes the third and fourth fires. The total deformation of the third fire is controlled at 35-45%, and the total deformation of the fourth fire must be ≥50%, so as to achieve the effect of grain refinement.

[0062] Step 7: Solution annealing of the bar. The annealing furnace should be Class III or above trolley annealing furnace or Class B or above box annealing furnace.

[0063] Among them, the component design:

[0064] The iron used should be pure iron of grade YT1 or above as specified in GB / T9971.

[0065] Chromium should be metal chromium of grade JCr98.5 or above as specified in GB / T3211.

[0066] Nickel shall be electrolytic nickel of grade Ni9950 or above as specified in GB / T6516.

[0067] Titanium is selected from grade 1 or above sponge titanium that meets the requirements of GB / T2524.

[0068] Aluminum should be Al99.5 or above as specified in GB / T1196.

[0069] The carbon used is the carbon spectroscopic electrode in TSC high-purity graphite that complies with the provisions of GB / T1426.

[0070] Manganese is selected from electrolytic manganese with a grade of Mn99.7 or above as specified in YB / T051.

[0071] Silicon is crystalline silicon that meets the composition requirements.

[0072] Boron is selected from master alloys that meet the composition requirements.

[0073] The chromium nitride used is chromium nitride with a particle size of 5 to 50 mm and a nitrogen content of about 12%.

[0074] The composition of Inconel690 is designed as follows:

[0075]

[0076] Nickel plate: 615.57kg, Cr: 290.55kg, Mn: 3kg, Si: 3kg, C: 0.22kg, CrN: 1.67kg, Fe: 83kg, Al: 3kg, B-Fe: 0.05kg (S and P are easy to segregate at the grain boundary, resulting in abnormal cracking at the grain boundary. The purity of the raw materials needs to be controlled to ensure that the S and P contents are less than 0.05%. CrN is added to the alloy ingredients mainly to improve the strength and corrosion resistance of the steel; B-Fe is mainly to improve the thermal strength and thermoplasticity of the steel, thereby improving the forging performance and reducing forging cracking and local overheating.)

[0077] Among them, step one specifically includes:

[0078] (1) Loading: When loading, first fill half of the carbon into the bottom of the crucible through the charging bucket, lay about 50kg of small nickel plates on the bottom, and use a hot furnace to load: when the vacuum degree is less than 10pa, start to supply power, 150~200kw;

[0079] (2) Material preparation: vacuum degree <10pa, argon is filled to 3kpa before each feeding, material preparation power is 300-400kw, feeding interval is short, and the overall material preparation time is ensured to be ≤2.5h;

[0080] (3) High temperature removal of inclusions: After adding all the main materials, increase the power to 500kw when the molten pool is cleared, raise the molten pool temperature to 1570±10℃, and maintain it for 5 to 10 minutes;

[0081] (4) Primary refining: After the temperature stabilizes at 1490-1530°C, the power is adjusted to 150-200 kW to ensure that the temperature is stable within the refining range, the refining vacuum is ≤5 Pa, and the refining time is 45-60 min;

[0082] (5) Adding alloying small materials: After refining, the power is reduced to 100kw, and after filling with argon gas 3-5kpa, Mn, Si, C, Ti, Al, CrN, B-Fe alloy small materials are slowly added through the upper feeding bin;

[0083] (6) Secondary refining: After the addition is completed, the power is increased to 450 kW until the temperature is maintained within 1470-1510 °C, then the power is reduced to 150 kW and the refining is continued for 20 min. The vacuum degree is ≤3 Pa, otherwise it is extended for 10 min.

[0084] (7) Casting: Fill with argon to 3-5 kPa, adjust the temperature to 1450-1470°C, and pour steel at a slow-fast-slow rate to ensure that there is no interruption in the chute. The mold is a half mold with a Φ295 electrode rod.

[0085] Composition after vacuum induction melting (wt%):

[0086] element C Cr Ni Mn Si S P content 0.024 28.97 61.70 0.32 0.30 0.001 0.004 element Ti Mo Cu Nb Sn Co V content 0.013 0.13 0.004 0.063 0.006 0.007 0.026 element B N Al Fe content 1E－04 0.001 0.320 7.830

[0087] Furthermore, step 2 specifically includes:

[0088] (1) The surface of the electrode rod after smelting needs to be polished to remove more than 95% of the oxide scale on the surface of the electrode rod. After sawing the electrode rod riser, it is welded with the auxiliary electrode. Then the electrode rod is placed in the mold baking station with a baking temperature of ≥550℃ and baked for more than 4 hours.

[0089] (2) Prepare the ingot starter plate and the arc starter block: Weld the three arc starter blocks to the center of the ingot starter plate and place them there. Prepare the slag material: ESR2702:SR81 = 1:1; 40-45 kg. Place the prepared slag material in a barrel and bake it in a baking station at a temperature of ≥650°C for more than 4 hours.

[0090] Step three includes:

[0091] (1) After the arc starts, wait until the current stabilizes, then turn on the feeder and add material to the crystallizer;

[0092] (2) Arcing and slag forming stage: current 2000-5500A, voltage 38-51V, time 20-25min;

[0093] (3) Power increase stage: current 6500-7500A, voltage 51-52V, time is about 15-20min;

[0094] (4) Remelting stage: current 7500~8500A, voltage 48±5V, time is about 120~140min;

[0095] (5) Shrinkage compensation stage: current 6500~4000A, voltage 46~43V, time is about 25min.

[0096] Step 3 (1) Before remelting begins, load the baked slag into the feeder and fix it to the feed port to wait for feeding; if the arc is broken for more than 5 seconds during the arcing and slagging stage, manually adjust the electrode position to contact the ingot block to start the arc until the arc is successfully started and then switch to automatic adjustment; After all the electroslag is remelted in step 3, it can be demoulded after cooling in the crystallizer for at least 30 minutes.

[0097] Requirements for step five: The heating equipment should be a natural gas heating furnace of Class IV or above / a box-type resistance furnace of Class B or above; the forging equipment should be a 40MN or above fast forging hydraulic press / a 15T or above electro-hydraulic hammer.

[0098] Among them, the heating system: slowly heat up to 800℃ after 8h, keep warm for 2h, then heat up to 1150±10℃ after 3h, keep warm for 5~6h, forge the blank: Φ410×900mm, roll forging one circle to 400×900 in eight directions, upset to H=560mm, deformation 37.8%, stretch to 430×770 in eight directions, deformation 27%, upset to H=480, deformation 37.7%, stretch to H 430×770 in eight directions, deformation 37.7%, return the hot material to the furnace; return to the furnace and keep warm for 2.5~3h, the return temperature is 1100℃;

[0099] The 430×770 in octagonal shape is then upset to H=480mm, with a deformation of 37.7%, drawn to Φ450×590mm, with a deformation of 18.6%, diagonally drawn to 430×770mm in octagonal shape, upset to H=480mm, drawn to Φ450×590mm, with a deformation of 18.6%, diagonally drawn to 430×770mm in octagonal shape, with a cross-sectional deformation of >32.4%, rolled and drawn to Φ400×950mm, with a deformation of 18.9%, and the hot material is returned to the furnace for 2.5 to 3 hours of insulation, and the furnace temperature is: 1100±10℃.

[0100] Specifically, step six: The specific implementation method is as follows:

[0101] Heating temperature: 1100℃, Φ400×950mm, V anvil drawing to Φ315×1470, deformation 38%, 2-3 times of drawing, hot material return to the furnace, single pressing amount 40-80mm, single feeding amount 80-120mm, strain rate 0.05-0.1s -1 , return to the furnace and keep warm for 2 to 2.5 hours;

[0102] Heating temperature: 1080℃, Φ315×1470, V anvil drawing to Φ215×3270, air cooling, deformation 53.4%, drawing in 3-4 times, if the surface temperature is less than 900℃, it is allowed to return to the furnace for 0.5-1h, the final forging temperature is ≥900℃, and other hot materials are not allowed to be placed within 1m of the air cooling to affect the cooling rate; single pressing amount 30-70mm, single feeding amount 60-140mm, strain rate 0.05-0.1s -1 .

[0103] Among them, the solution treatment system in the annealing furnace in step seven is:

[0104] System 1: 1075±10℃×4h, WQ;

[0105] Aging system: 715±10℃×10h, AC;

[0106] System 2: 1075±10℃×2.5h, WQ;

[0107] Aging: 715±10℃×12h, AC.

[0108] Mechanical properties:

[0109] Room temperature tensile data

[0110]

[0111] High temperature tensile data

[0112]

[0113] ASTM standard bar grain size: Grade 3 or finer

[0114] Measured: 3.5~4.2

[0115] Through the low-cost process, the bar that meets the standard requirements is obtained. Under the same process, this process obtains more uniform equiaxed grains, which reduces the processing time while ensuring excellent performance. By adjusting the annealing temperature and time, the generation of annealing twins is reduced.

[0116] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A production process for Inconel rods, characterized in that: The following steps are involved: Step 1: Use a 1T vacuum induction furnace to smelt and cast electrode rods. The process includes: charging, smelting, high-temperature inclusion removal, primary refining, adding alloying small materials, secondary refining and cooling casting; Step 2: Preparation before electroslag remelting, which includes: electrode rod surface treatment, ingot welding and slag preparation; Step 3: electroslag remelting; electroslag remelting includes: arcing and slag, current raising, remelting and shrinkage feeding stages; Step 4: After the electroslag ingot is completely cooled, the starter plate needs to be gas cut along the bottom diameter to remove the excess starter plate for subsequent forging; Step 5, blanking and forging includes the first and second firings, and the cast structure is fully broken by repeated forging. The temperature of the first firing of blanking is controlled at 1150±10℃, and the temperature is kept for 5-6 hours, and the deformation amount is 35-45%. The second firing ensures that the cast structure is completely broken and supplemented by the diagonal pulling deformation method, so as to obtain a uniform structure; Step 6: The drawing forging includes the third and fourth fires. The total deformation of the third fire is controlled at 35-45%, and the total deformation of the fourth fire must be ≥50%, so as to achieve the effect of grain refinement. Step 7: Solution annealing of the bar. The annealing furnace should be Class III or above trolley annealing furnace or Class B or above box annealing furnace.

2. The production process of Inconel rod according to claim 1, characterized in that: The step 1 specifically includes: (1) Loading: When loading, first fill half of the carbon into the bottom of the crucible through the charging bucket, lay about 50kg of small nickel plates on the bottom, and use a hot furnace to load: when the vacuum degree is less than 10pa, start to supply power, 150~200kw; (2) Material preparation: vacuum degree <10pa, argon is filled to 3kpa before each feeding, material preparation power is 300-400kw, feeding interval is short, and the overall material preparation time is ensured to be ≤2.5h; (3) High temperature removal of inclusions: After adding all the main materials, increase the power to 500kw when the molten pool is cleared, raise the molten pool temperature to 1570±10℃, and maintain it for 5 to 10 minutes; (4) Primary refining: After the temperature stabilizes at 1490-1530°C, the power is adjusted to 150-200 kW to ensure that the temperature is stable within the refining range, the refining vacuum is ≤5 Pa, and the refining time is 45-60 min; (5) Adding alloying small materials: After refining, the power is reduced to 100kw, and after filling with argon gas 3-5kpa, Mn, Si, C, Ti, Al, CrN, B-Fe alloy small materials are slowly added through the upper feeding bin; (6) Secondary refining: After the addition is completed, the power is increased to 450 kW until the temperature is maintained within 1470-1510 °C, then the power is reduced to 150 kW, and the refining time is 20 min. The vacuum degree is ≤3 Pa, otherwise it is extended for 10 min. (7) Casting: Fill with argon to 3-5 kPa, adjust the temperature to 1450-1470°C, and pour steel at a slow-fast-slow rate to ensure that there is no interruption in the chute. The mold is a half mold with a Φ295 electrode rod.

3. The production process of Inconel rod according to claim 2, characterized in that: The step 2 specifically includes: (1) The surface of the electrode rod after smelting needs to be polished to remove more than 95% of the oxide scale on the surface of the electrode rod. After sawing the electrode rod riser, it is welded with the auxiliary electrode. Then the electrode rod is placed in the mold baking station with a baking temperature of ≥550℃ and baked for more than 4 hours. (2) Prepare the ingot starter plate and the arc starter block: Weld the three arc starter blocks to the center of the ingot starter plate and place them there. Prepare the slag material: ESR2702:SR81 = 1:1; 40-45 kg. Place the prepared slag material in a barrel and bake it in a baking station at a temperature of ≥650°C for more than 4 hours.

4. The production process of Inconel rod according to claim 3, characterized in that: The step three comprises: (1) After the arc starts, wait until the current stabilizes, then turn on the feeder and add material to the crystallizer; (2) Arcing and slag forming stage: current 2000-5500A, voltage 38-51V, time 20-25min; (3) Power increase stage: current 6500-7500A, voltage 51-52V, time is about 15-20min; (4) Remelting stage: current 7500~8500A, voltage 48±5V, time is about 120~140min; (5) Shrinkage compensation stage: current 6500~4000A, voltage 46~43V, time is about 25min.

5. The process for producing the inconel rod according to claim 4, characterized in that: In the step 3 (1), before the remelting begins, the baked slag is loaded into the feeder and fixed to the feed port to wait for feeding; if the arc is broken for more than 5 seconds during the arcing and slagging stage, the electrode position is manually adjusted to contact the ingot block to start the arc, and then the automatic adjustment is switched after the arc is successfully started; after all the electroslag is remelted in step 3, it can be demoulded after cooling in the crystallizer for at least 30 minutes.

6. The process for producing inconel rods according to claim 1, characterized in that: The requirements for step five are as follows: the heating equipment shall be a natural gas heating furnace of Class IV or above / a box-type resistance furnace of Class B or above; the forging equipment shall be a 40MN or above fast forging hydraulic press / a 15T or above electro-hydraulic hammer.

7. The process for producing the inconel rod according to claim 6, characterized in that: Heating system: slowly heat up to 800℃ after 8h, keep warm for 2h, then heat up to 1150±10℃ after 3h, keep warm for 5~6h, forge the blank: Φ410×900mm, roll forge one circle to 400×900 in all directions, upset to H=560mm, deformation 37.8%, stretch to 430×770 in all directions, deformation 27%, upset to H=480, deformation 37.7%, stretch to 430×770 in all directions, deformation 37.7%, return the hot material to the furnace; return to the furnace and keep warm for 2.5~3h, the return temperature is 1100℃; The 430×770 in octagonal shape is then upset to H=480mm, with a deformation of 37.7%, drawn to Φ450×590mm, with a deformation of 18.6%, diagonally drawn to 430×770mm in octagonal shape, upset to H=480mm, drawn to Φ450×590mm, with a deformation of 18.6%, diagonally drawn to 430×770mm in octagonal shape, with a cross-sectional deformation of >32.4%, rolled and drawn to Φ400×950mm, with a deformation of 18.9%, and the hot material is returned to the furnace for 2.5 to 3 hours of insulation, and the furnace temperature is: 1100±10℃.

8. The process for producing inconel rods according to claim 1, characterized in that: The specific implementation method of step six is ​​as follows: Heating temperature: 1100℃, Φ400×950mm, V anvil drawing to Φ315×1470, deformation 38%, 2-3 times of drawing, hot material return to the furnace, single pressing amount 40-80mm, single feeding amount 80-120mm, strain rate 0.05-0.1s -1 , return to the furnace and keep warm for 2 to 2.5 hours; Heating temperature: 1080℃, Φ315×1470, V anvil drawing to Φ215×3270, air cooling, deformation 53.4%, drawing in 3-4 times, if the surface temperature is less than 900℃, it is allowed to return to the furnace for 0.5-1h, the final forging temperature is ≥900℃, and other hot materials are not allowed to be placed within 1m of the air cooling to affect the cooling rate; single pressing amount 30-70mm, single feeding amount 60-140mm, strain rate 0.05-0.1s -1 .

9. The process for producing inconel rods according to claim 1, characterized in that: The solution treatment system in the annealing furnace in step 7 is: System 1: solution 1075±10℃×4h, WQ; Aging 715±10℃×10h, AC; System 2: solution 1075±10℃×2.5h, WQ; Aging: 715±10℃×12h, AC.

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