Pure nickel N6 wire production method based on vacuum induction melting

Abstract

The invention relates to the technical field of nickel and nickel alloy processing, and discloses a pure nickel N6 wire production method based on vacuum induction melting, which comprises an adopted vacuum induction melting furnace, a vacuum pump is arranged on the outer side of the vacuum induction melting furnace, and a gravity settling assembly is arranged on the front surface of the vacuum pump. A treatment barrel is arranged on one side of the vacuum induction melting furnace, and the method is characterized by comprising the following steps that S1, raw materials are pretreated; s2, smelting in a vacuum induction furnace; s3, casting a square billet; s4, square billet forging; s5, flaw detection of the square billet; s6, square billet coping; s7, high-speed wire rolling; and S8, inspecting and warehousing. The production process is simplified, the production efficiency is improved, the production period is shortened, the cost is reduced, meanwhile, the product quality can be improved, and the production cost can be reduced by arranging the vacuum induction furnace smelting and high-speed wire rolling and adopting the one-heating forming process of direct forging of the die cast ingot.

Description

Technical Field

[0001] The present invention relates to the technical field of processing nickel and nickel alloys, and specifically to a production method of pure nickel N6 wire based on vacuum induction melting. Background Art

[0002] Pure nickel N6 is one of the processed nickel and nickel alloys in the national standard GBT5235 - 2007, and contains the following components by weight percentage: C: ≤0.10%; Si: ≤0.10%; Mn: ≤0.05%; P: ≤0.002%; S ≤0.005%; Ni + Co: ≥99.5%; Cu: ≤0.10%; Fe: ≤0.10%; Mg: ≤0.10%; Pb, Bi, As, Sb, Cd, Sn: ≤0.002%; Zn: ≤0.007%; total impurities: ≤0.50%. Nickel has high strength and good plasticity, making it have excellent formability under both cold working and hot working conditions. Nickel has high chemical stability and is one of the materials with outstanding corrosion resistance in the field of heavy non-ferrous metals, especially with strong corrosion resistance to caustic alkalis. With the continuous development of industries such as electric power, communication, aerospace, and petrochemical industry, the demand for high-performance pure nickel wire is also increasing continuously. As an important material among them, N6 pure nickel wire is favored because of its good corrosion resistance, high temperature strength and plasticity. Especially in some high-end fields, such as aerospace and nuclear power energy, the quality and performance requirements for N6 pure nickel wire are higher, so the market demand continues to grow. Experiments have proved that nickel with a purity of 99% will not have rust marks within 20 years. The crystal structure of nickel is face-centered cubic, and it is the main austenite-forming element. The pure nickel austenite alloy containing a small amount of control elements has very good plasticity and can draw nickel wires with a minimum diameter of 0.01 mm.

[0003] At present, for some manufacturing processes of pure nickel N6 wire, during the production process of pure nickel N6 wire, the metal raw materials are easily contaminated by oxygen and other impurities, resulting in a decrease in metal purity and quality. At the same time, during the production process of pure nickel N6 wire, the traditional process requires multiple heating and forging, resulting in a reduction in production efficiency, and problems such as internal defects and coarse grains are likely to occur. Summary of the Invention

[0004] The purpose of the present invention is to provide a production method of pure nickel N6 wire based on vacuum induction melting to solve the problems that the metal raw materials are easily contaminated by oxygen and other impurities during the melting process, and at the same time, multiple heating and forging result in a reduction in production efficiency.

[0005] To achieve the above object, the present invention provides the following technical solution: A method for producing pure nickel N6 wire based on vacuum induction melting, including the vacuum induction melting furnace used, a vacuum pump is arranged outside the vacuum induction melting furnace, a gravity sedimentation component is arranged on the front surface of the vacuum pump, and a treatment barrel is arranged on one side of the vacuum induction melting furnace, characterized by including the following steps:

[0006] S1. Raw material pretreatment: Select pure nickel raw materials that meet national standards, and perform pickling, ultrasonic cleaning, nitrogen purging and drying;

[0007] S2. Vacuum induction furnace melting: Heat the raw materials in the vacuum induction melting furnace, melt and refine the raw materials, and the generated waste gas and metal dust are transported to the gravity sedimentation component and the treatment barrel through the vacuum pump for treatment and recovery;

[0008] S3. Casting and billet preparation: Pour the molten metal into a water-cooled mold to form a nickel ingot;

[0009] S4. Billet forging: Forge the nickel ingot at high temperature in multiple directions to eliminate porosity and refine the grains, thereby obtaining a billet;

[0010] S5. Billet flaw detection: Detect internal defects of the billet by ultrasonic waves;

[0011] S6. Billet grinding: Grind and remove surface defects and scale of the billet to improve rolling quality;

[0012] S7. High-speed wire rolling: Precisely control the heating and rolling parameters by heating in a walking beam reheating furnace, and perform controlled cooling on the air-cooled line;

[0013] S8. Inspection and warehousing: Inspect the obtained wire, and warehousing the qualified wire.

[0014] Preferably, in S1, the raw materials need to select pure nickel raw materials that meet GB / T5235-2007 of the national standard, and contain the following components by weight percentage: C≤0.10%, Si≤0.10%, Mn≤0.05%, P≤0.002%, S≤0.005%, Ni+Co≥99.5%, Cu≤0.10%, Fe≤0.10%, Mg≤0.10%, Pb, Bi, As, Sb, Cd, Sn≤0.002%, Zn≤0.007%, total impurities≤0.50%. In S1, pickling treatment and ultrasonic cleaning need to be performed on the raw materials. Among them, the pickling treatment needs to be soaked in 10% HCl solution for 30 minutes. The frequency of ultrasonic cleaning is 40 kHz, and the cleaning time is 15 minutes. After the cleaning is completed, it needs to be purged with nitrogen and dried in an 80°C oven for 2 hours.

[0015] Preferably, in S2, the pre-treated raw materials need to be melted and refined in the vacuum induction melting furnace 1. The pre-treated raw materials need to be heated to 1480°C - 1520°C and held for 30 minutes - 60 minutes. Meanwhile, the tapping temperature is controlled at 1510°C - 1530°C.

[0016] Preferably, in S3, the raw materials need to be cast by a water-cooled copper mold. The casting temperature is 1500°C - 1530°C, and the cooling rate is 10°C - 20°C / s to form a nickel ingot with a diameter of Φ100 - 200 mm.

[0017] Preferably, in S4, the nickel ingot after the casting operation needs to be forged. The forging temperature is ≥1050°C, and the stopping forging temperature is ≥950°C. It is forged in multiple directions by a hydraulic forging machine. In S5, ultrasonic inspection is required for internal defects of the billet. In S6, the billet needs to be ground by a silicon carbide grinding wheel to remove surface defects and scale of the billet.

[0018] Preferably, in S7, the billet needs to be heated by a walking beam reheating furnace, and the staff needs to control the heating temperature of the blooming billet. In S7, when controlling the temperature of the blooming billet, the preheating section temperature is ≤800°C, the heating section temperature is 800°C - 1050°C, the soaking section temperature is 1060°C - 1080°C, the rolling start temperature is 1060°C, the final rolling and laying temperature is 800 - 850°C, the finishing rolling speed is 35 m / s, the rolling specification is Φ7.0 mm, the controlled cooling rate of the air cooling line is 20 - 30°C / s, and the grain size is ≤50 μm.

[0019] Preferably, in S8, the staff needs to conduct a comprehensive inspection on the wire rod, including macrostructure analysis, inclusion rating, and mechanical property testing. According to the inspection results, the qualified products will be labeled and stored in the warehouse, while the unqualified products will be repaired or scrapped.

[0020] Preferably, a side pipe is connected to the outside of the vacuum induction melting furnace, and one end of the side pipe away from the vacuum induction melting furnace is connected to a vacuum pump. A connecting pipe is connected to the top of the treatment barrel. The gravity sedimentation component includes a sedimentation tank arranged on the front surface of the vacuum pump. A first baffle is fixedly connected to the bottom of the inner cavity of the sedimentation tank. A collection box is connected to the bottom of the sedimentation tank. A second baffle is fixedly connected to the top of the inner cavity of the sedimentation tank.

[0021] Preferably, a first connecting pipe is connected to the rear surface of the sedimentation tank. A first connecting ring is arranged on the outside of the first connecting pipe. A second connecting pipe is connected to the top of the sedimentation tank. The top of the second connecting pipe is connected to the bottom of the connecting pipe. A PLC controller is arranged on the outside of the treatment barrel. A second connecting ring is rotatably connected to the outside of the second connecting pipe. A motor is fixedly connected to the top of the inner cavity of the treatment barrel.

[0022] Preferably, a stirring rod is fixedly connected to the output end of the motor, a deflector is fixedly connected to the inner wall of the treatment barrel, stirring blades are fixedly connected to the outer side of the stirring rod, through grooves are formed in the interior of the stirring blades, an air outlet pipe is communicated with the outer side of the treatment barrel, a liquid storage tank is fixedly connected to the outer side of the treatment barrel, a delivery pump is fixedly connected to the top of the liquid storage tank, a delivery pipe is communicated with the liquid outlet of the delivery pump, one end of the delivery pipe far away from the delivery pump is communicated with a spray pipe, and spray heads are communicated with the bottom of the spray pipe.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] By setting raw material pretreatment, the present invention can ensure that the raw materials meet the requirements, prevent excessive impurities inside, and can clean the raw materials to be subjected to subsequent treatment, remove the oxide layer and oil stain on their surfaces, and ensure that there is no residue on the surface of the raw materials, so that the raw materials can maintain a high purity during the processing process. By setting vacuum induction furnace melting, under the action of the vacuum induction furnace, impurities in the raw materials during the heating and melting process can be reduced, and the temperature can be accurately controlled, thereby improving the efficiency of raw material melting and refining. By setting casting and billet preparation, casting the raw materials through a water-cooled mold can reduce the oxidation and pollution of metals, improve the quality of nickel ingots, and at the same time, the formed nickel ingots have regular shapes and sizes, which are convenient for subsequent processing and treatment. By setting billet forging, the "one-fire forming" process of directly forging the ingot casting simplifies the production process, improves production efficiency, shortens the production cycle, and reduces costs. By setting billet flaw detection, the defects of the billet can be detected and found through ultrasonic equipment. Under the action of the ultrasonic equipment, damage to the billet can be prevented, and the defects of the billet can be removed conveniently. By setting billet grinding, the defects and oxide scales on the surface of the billet can be removed, thereby improving the quality of the billet. By setting high-speed wire rolling, under the action of a walking beam reheating furnace, the heating temperature and rolling parameters of the billet can be accurately controlled, so that the quality of the product can be improved when the billet is rolled. By setting inspection and warehousing, the staff conducts quality inspection on the produced pure nickel N6 wire rods, which can ensure the quality of the pure nickel N6 wire rods and prevent defective products from flowing into use. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a process flow chart of a preferred embodiment of the method for producing pure nickel N6 wire rods based on vacuum induction melting provided by the present invention;

[0026] Figure 2 is a structural schematic diagram of a preferred embodiment of the method for producing pure nickel N6 wire rods based on vacuum induction melting provided by the present invention;

[0027] Figure 3 Schematic structural diagram of the gravity sedimentation component provided by the present invention;

[0028] Figure 4 Schematic internal structure diagram of the treatment barrel provided by the present invention;

[0029] Figure 5 Schematic structural connection diagram of the spray pipe and the spray head provided by the present invention.

[0030] In the figure: 1, vacuum induction melting furnace; 2, side pipe; 3, treatment barrel; 4, vacuum pump; 5, gravity sedimentation component; 51, sedimentation tank; 52, first baffle; 53, collection box; 54, second baffle; 6, connecting pipe; 7, first connecting pipe; 8, first connecting ring; 9, second connecting pipe; 10, PLC controller; 11, second connecting ring; 12, motor; 13, stirring rod; 14, guide plate; 15, stirring blade; 16, through groove; 17, air outlet pipe; 18, liquid storage tank; 19, delivery pump; 20, delivery pipe; 21, spray pipe; 22, spray head. Specific embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Please refer to Figures 1-5 As shown, a method for producing pure nickel N6 wire based on vacuum induction melting includes the vacuum induction melting furnace 1 used. By setting the vacuum induction melting furnace 1, the metal raw materials can be melted and processed. A vacuum pump 4 is arranged on the outside of the vacuum induction melting furnace 1. By setting the vacuum pump 4, the waste gas and metal dust inside the vacuum induction melting furnace 1 can be extracted and transported. A gravity sedimentation component 5 is arranged on the front surface of the vacuum pump 4. By setting the gravity sedimentation component 5, the large particle metal dust passing through the inside of the sedimentation tank 51 can be blocked, so that the metal dust settles inside the sedimentation tank 51, and the large particle metal dust can be collected uniformly, reducing resource waste. A treatment barrel 3 is arranged on one side of the vacuum induction melting furnace 1. By setting the treatment barrel 3, under the action of the treatment barrel 3, the waste gas and small particle metal dust can be treated to prevent the waste gas from being discharged into the air and causing environmental pollution. It is characterized by including the following steps:

[0033] S1. Raw material pretreatment: Select pure nickel raw materials that meet national standards, and perform pickling, ultrasonic cleaning, nitrogen purging and drying;

[0034] S2. Melting in the vacuum induction furnace 1: Heat the raw materials in the vacuum induction melting furnace 1, melt and refine the raw materials, and convey the generated waste gas and metal dust to the gravity sedimentation component 5 and the treatment barrel 3 for treatment and recovery;

[0035] S3. Casting and billet preparation: Pour the molten metal into a water-cooled mold to form nickel ingots;

[0036] S4. Billet forging: Forge the nickel ingot at high temperature in multiple directions to eliminate porosity and refine the grains, thereby obtaining billets;

[0037] S5. Billet flaw detection: Detect internal defects of the billet by ultrasonic waves;

[0038] S6. Billet grinding: Grind to remove surface defects and scale of the billet to improve the rolling quality;

[0039] S7. High-speed wire rolling: Precisely control the heating and rolling parameters by heating in a walking beam reheating furnace, and control the cooling by an air-cooling line;

[0040] S8. Inspection and warehousing: Inspect the obtained wire rods, and warehousing the qualified wire rods.

[0041] In S1, the raw materials need to be pure nickel raw materials that meet the national standard GB / T5235-2007, containing the following components by weight percentage: C≤0.10%, Si≤0.10%, Mn≤0.05%, P≤0.002%, S≤0.005%, Ni+Co≥99.5%, Cu≤0.10%, Fe≤0.10%, Mg≤0.10%, Pb, Bi, As, Sb, Cd, Sn≤0.002%, Zn≤0.007%, and the total impurities≤0.50%. Selecting pure nickel raw materials that meet the national standard can ensure the basic quality and performance of the wire rods after processing. In S1, the raw materials need to be pickled and ultrasonically cleaned. Among them, the pickling treatment requires soaking in a 10% HCl solution for 30 minutes, and the frequency of ultrasonic cleaning is 40 kHz, and the cleaning time is 15 minutes. After cleaning, it needs to be dried in an 80°C oven for 2 hours after nitrogen purging. By setting pickling, oxides and contaminants on the surface of the raw materials can be removed, improving the purity and surface activity of the raw materials. By setting ultrasonic cleaning, tiny impurities and oil stains on the surface of the raw materials can be removed, ensuring the cleanliness of the raw material surface. By setting nitrogen purging and drying, the raw materials will not be oxidized and contaminated during subsequent processing, improving the processing efficiency.

[0042] In S2, the pre-treated raw materials need to be melted and refined in a vacuum induction melting furnace. The pre-treated raw materials need to be heated to 1480°C to 1520°C and held for 30 minutes to 60 minutes. At the same time, the tapping temperature is controlled at 1510°C to 1530°C. By setting up a vacuum induction furnace, under the action of the vacuum induction furnace, the raw materials can be melted in a vacuum environment, avoiding the influence of oxygen and other impurities on the metal, improving the purity and quality of the metal. At the same time, by controlling its heating temperature, the stability and controllability of the melting process can be improved, and the inclusions and gases in the metal can be removed during the melting and refining process, improving the density and uniformity of the metal.

[0043] In S3, the raw materials need to be cast by a water-cooled copper mold. The casting temperature is 1500°C to 1530°C, and the cooling rate is 10°C to 20°C / s to form a nickel ingot with a diameter of Φ100 to 200 mm. By setting up the casting of metal raw materials, the molten metal can be quickly cooled to form a dense nickel ingot.

[0044] In S4, the nickel ingot after the casting operation needs to be forged. The forging temperature is ≥1050°C, and the stopping forging temperature is ≥950°C. It is forged in multiple directions by a hydraulic forging machine. By forging the nickel ingot and controlling its forging temperature and stopping forging temperature, high-temperature multi-directional forging can eliminate the porosity and defects in the nickel ingot, improve the density and strength of the metal. The forging process can also refine the grains, improve the toughness and plasticity of the metal. The obtained billet has uniform structure and properties, which is convenient for subsequent processing and forming. At the same time, it simplifies the production process, improves production efficiency, shortens the production cycle, and reduces costs. In S5, ultrasonic testing is required to detect internal defects of the billet. In S6, the billet needs to be ground by a silicon carbide grinding wheel to remove surface defects and scale of the billet. Through ultrasonic testing, internal defects and cracks of the billet can be detected in time to avoid problems in subsequent processing. By setting up billet grinding, surface defects and scale of the billet can be removed, improving the surface smoothness and cleanliness. At the same time, grinding can also reduce friction and resistance during the rolling process, improving rolling efficiency and product quality.

[0045] In S7, the bloom needs to be heated by a walking beam reheating furnace, and the staff needs to control the heating temperature of the blooming billet. In S7, when controlling the temperature of the blooming billet, the preheating section temperature ≤ 800 °C, the heating section temperature is 800 °C - 1050 °C, the soaking section temperature is 1060 °C - 1080 °C, the rolling start temperature is 1060 °C, the final rolling and laying temperature is 800 - 850 °C, the finishing rolling speed is 35 m / s, the rolling specification is Φ7.0 mm, the controlled cooling rate of the air cooling line is 20 - 30 °C / s, and the grain size ≤ 50 μm. By controlling the heating temperature and rolling parameters, the structure and properties of the wire rod can be ensured to meet the requirements. At the same time, under the action of the controlled cooling of the air cooling line, the structure and properties of the wire rod can be further adjusted to improve the quality and stability of the product.

[0046] In S8, the staff needs to conduct a comprehensive inspection of the wire rod, including macrostructure analysis, inclusion rating, and mechanical property testing. According to the inspection results, the qualified products will be labeled and stored in the warehouse, while the unqualified products will be repaired or scrapped. By inspecting the obtained wire rod, the product quality can meet the relevant standards and requirements. At the same time, potential quality problems can be discovered and processed in a timely manner during the inspection process to prevent problem products from entering the market.

[0047] Reference Figure 2 and Figure 3 As shown in the figure, a side pipe 2 is connected to the outside of the vacuum induction melting furnace 1. By setting the side pipe 2, under the action of the side pipe 2, the vacuum pump 4 can extract and transport the metal dust and waste gas inside the vacuum induction melting furnace 1. One end of the side pipe 2 away from the vacuum induction melting furnace 1 is connected to the vacuum pump 4. A connecting pipe 6 is connected to the top of the treatment barrel 3. By setting the connecting pipe 6, the small particle metal dust and waste gas after the sedimentation operation can enter the inside of the treatment barrel 3. The gravity sedimentation component 5 includes a sedimentation box 51 arranged on the front surface of the vacuum pump 4. By setting the sedimentation box 51, the large particle metal dust passing through the inside of the sedimentation box 51 can be blocked, so that the large particle metal dust can settle inside the collection box 53. A first baffle 52 is fixedly connected to the bottom of the inner cavity of the sedimentation box 51. The bottom of the sedimentation box 51 is connected to the collection box 53. By setting the collection box 53, under the action of the collection box 53, it is convenient for the staff to uniformly process and collect the collected large particle metal dust. A second baffle 54 is fixedly connected to the top of the inner cavity of the sedimentation box 51. By setting the first baffle 52 and the second baffle 54, the large particle metal dust passing through the sedimentation box 51 can be blocked, so that the large particle metal dust can settle inside the collection box 53.

[0048] The rear surface of the settling tank 51 is connected to a first connecting pipe 7. By providing the first connecting pipe 7, under the action of the first connecting pipe 7, the waste gas and metal dust conveyed by the vacuum pump 4 can enter the interior of the settling tank 51. A first connecting ring 8 is provided on the outer side of the first connecting pipe 7. By providing the first connecting ring 8, when the staff needs to disassemble the settling tank 51, rotate the first connecting ring 8. Then, under the action of the first connecting ring 8, the first connecting pipe 7 and the vacuum pump 4 can be separated. The top of the settling tank 51 is connected to a second connecting pipe 9. By providing the second connecting pipe 9, the metal dust and waste gas passing through the interior of the settling tank 51 can enter the interior of the treatment barrel 3 for treatment. The top of the second connecting pipe 9 is connected to the bottom of the connecting pipe 6. A PLC controller 10 is provided on the outer side of the treatment barrel 3. By providing the PLC controller 10, under the action of the PLC controller 10, various electronic components of this device can be controlled. The second connecting pipe 9 is rotatably connected to a second connecting ring 11. By providing the second connecting ring 11, rotate the second connecting ring 11 to make the second connecting ring 11 disengage from the outer side of the connecting pipe 6. Then, the second connecting pipe 9 and the connecting pipe 6 can be separated. A motor 12 is fixedly connected to the top of the inner cavity of the treatment barrel 3. By providing the motor 12, under the action of the motor 12, the stirring rod 13 and the stirring blades 15 can rotate.

[0049] Reference Figure 4 and Figure 5 As shown in the figure, the output end of the motor 12 is fixedly connected to a stirring rod 13. A guide plate 14 is fixedly connected to the inner wall of the treatment barrel 3. By providing the guide plate 14, under the action of the guide plate 14, the small-particle metal dust and waste gas entering the interior of the treatment barrel 3 can flow evenly. Stirring blades 15 are fixedly connected to the outer side of the stirring rod 13. By providing the stirring rod 13 and the stirring blades 15, under the action of the stirring rod 13 and the stirring blades 15, the air inside the treatment barrel 3 can flow, so that the chemical reagent droplets are fully mixed with the metal dust and waste gas. Through grooves 16 are formed inside the stirring blades 15. An air outlet pipe 17 is connected to the outer side of the treatment barrel 3. By providing the air outlet pipe 17, the treated waste gas can be discharged from the interior of the treatment barrel 3. At the same time, the air outlet pipe 17 can be sealed with a sealing plug. A liquid storage tank 18 is fixedly connected to the outer side of the treatment barrel 3. A delivery pump 19 is fixedly connected to the top of the liquid storage tank 18. By providing the delivery pump 19, under the action of the delivery pump 19, the treatment liquid in the liquid storage tank 18 can be extracted and conveyed. The liquid outlet of the delivery pump 19 is connected to a delivery pipe 20. The end of the delivery pipe 20 away from the delivery pump 19 is connected to a spray pipe 21. Spray nozzles 22 are connected to the bottom of the spray pipe 21. By providing the spray pipe 21 and the spray nozzles 22, the conveyed liquid medicine can be sprayed out through the spray nozzles 22, so as to treat the metal dust and waste gas inside the treatment barrel 3.

[0050] Working principle: When manufacturing pure nickel wire rods, workers first need to perform pretreatment operations on the raw materials to remove the oxide layer and oil stains on the wire rod surface. Then, workers put alloy materials such as nickel plates, electrolytic manganese, and single-crystalline silicon into a vacuum induction furnace. Next, start the vacuum induction furnace and simultaneously start the heating system to raise the temperature in the furnace to 1510°C - 1530°C for melting and refining the alloy materials. At the same time, the tapping temperature is precisely controlled at 1510°C - 1530°C. Then, workers use a water-cooled copper mold to pour the melted alloy liquid, with the pouring temperature controlled at 1500°C - 1530°C and the cooling rate maintained at 10°C - 20°C / s to ensure rapid solidification and form a nickel ingot with a diameter of Φ100 - 200mm. After forming the nickel ingot, quality inspection personnel conduct a visual inspection on the surface of the nickel ingot and mark any possible defective areas such as cracks and pores. Then, workers use a hydraulic forging machine to perform multi-directional forging at a forging temperature of ≥1050°C and a stop-forging temperature of ≥950°C. Through the process of one-fire forming, the as-cast porosity defects can be effectively eliminated, thereby obtaining a dense and high-performance material. After completing the forging of the billet, workers use ultrasonic flaw detection equipment to detect internal defects of the billet, record and mark any detected defects. When the defect rate is too high, the entire batch of billets needs to be returned to the furnace for remelting. After completing the flaw detection operation, workers then use a silicon carbide grinding wheel to grind the surface of the billet to remove the marked defects and oxide scale to ensure that there are no cracks and scratches on the surface before rolling. At the same time, according to the surface finish requirements, the billet is ground. The billet that has completed the grinding operation is heated through a walking beam reheating furnace, and at the same time, it is necessary to control the preheating section temperature ≤800°C, the heating section temperature 800 - 1050°C, and the soaking section temperature 1060 - 1080°C. During the rolling process, the rolling start temperature is set at 1060°C, the final rolling and coiling temperature is controlled at 800 - 850°C, and the finishing rolling speed reaches 35m / s, finally rolling out wire rods with a specification of Φ7.0mm. At the same time, the air-cooling line adopts the Stelmor controlled cooling process and is equipped with temperature sensors to monitor the cooling rate in real time. After the wire rods are produced, workers need to conduct a comprehensive inspection on the wire rods, including macrostructure analysis, inclusion rating, and mechanical property testing. According to the inspection results, the qualified and unqualified wire rods are processed and placed separately.

[0051] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element.

[0052] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for producing pure nickel N6 wire based on vacuum induction melting, comprising a vacuum induction melting furnace (1) used, wherein a vacuum pump (4) is arranged on the outside of the vacuum induction melting furnace (1), a gravity sedimentation component (5) is arranged on the front surface of the vacuum pump (4), and a processing barrel (3) is arranged on one side of the vacuum induction melting furnace (1), characterized in that: The following steps are involved: S1. Raw material pretreatment: Select pure nickel raw materials that meet national standards, and perform pickling, ultrasonic cleaning, nitrogen purging and drying; S2. Vacuum induction furnace (1) smelting: heating the raw materials in the vacuum induction melting furnace (1), melting and refining the raw materials, and transporting the generated waste gas and metal dust to the gravity settling component (5) and the processing barrel (3) through the vacuum pump (4) for processing and recovery; S3, casting and billet preparation: using a water-cooled mold to pour the molten metal to form a nickel ingot; S4. Billet forging: high temperature multi-directional forging of nickel ingots to eliminate porosity and refine grains to obtain billets; S5. Billet flaw detection: Use ultrasonic waves to detect internal defects in the billet; S6. Billet grinding: Grinding removes billet surface defects and oxide scale to improve rolling quality; S7, high-speed wire rolling: heating and rolling parameters are precisely controlled by heating in a walking beam furnace, and air cooling is controlled by wire cooling; S8. Inspection and warehousing: The obtained wires are inspected and the qualified ones are put into warehousing.

2. A method for producing pure nickel N6 wire based on vacuum induction melting according to claim 1, characterized in that: In the S1, the raw materials need to be pure nickel raw materials that meet the national standard GB / T5235-2007, and contain the following components by weight percentage: C≤0.10%, Si≤0.10%, Mn≤0.05%, P≤0.002%, S≤0.005%, Ni+Co≥99.5%, Cu≤0.10%, Fe≤0.10%, Mg≤0.10%, Pb, Bi, As, Sb, Cd, Sn≤0.002%, Zn≤0.007%, and the total impurities ≤0.50%. In the S1, the raw materials need to be pickled and ultrasonically cleaned, wherein the pickling treatment needs to be soaked in 10% HCl solution for 30 minutes, wherein the frequency of ultrasonic cleaning is 40kHz, and the cleaning time is 15 minutes. After the cleaning is completed, it needs to be purged with nitrogen and dried in an oven at 80°C for 2 hours.

3. The method for producing pure nickel N6 wire based on vacuum induction melting according to claim 1, characterized in that: In S2, the raw materials after pretreatment need to be melted and refined by vacuum induction melting furnace 1. The raw materials after pretreatment need to be heated to 1480°C to 1520°C and kept warm for 30 minutes to 60 minutes. At the same time, the steel tapping temperature is controlled at 1510°C to 1530°C.

4. The method for producing pure nickel N6 wire based on vacuum induction melting according to claim 1, characterized in that: In S3, the raw material needs to be poured through a water-cooled copper mold at a pouring temperature of 1500° C. to 1530° C. and a cooling rate of 10° C. to 20° C. / s to form a nickel ingot with a diameter of Φ100 to 200 mm.

5. The method for producing pure nickel N6 wire based on vacuum induction melting according to claim 1, characterized in that: In S4, the nickel ingot after the casting operation needs to be forged, wherein the forging temperature is ≥1050°C, the stop forging temperature is ≥950°C, and it is multi-directionally forged by a hydraulic forging machine. In S5, the internal defects of the square billet need to be detected by ultrasonic wave. In S6, the square billet needs to be ground by a silicon carbide grinding wheel to remove the surface defects and oxide scale of the square billet.

6. The method for producing pure nickel N6 wire based on vacuum induction melting according to claim 1, characterized in that: In the S7, the billet needs to be heated by a walking-beam heating furnace, and the staff needs to control the heating temperature of the initial rolled billet. In the S7, when the temperature of the initial rolled billet is controlled, the preheating section temperature is ≤800°C, the heating section temperature is 800°C~1050°C, the soaking section temperature is 1060°C~1080°C, the start rolling temperature is 1060°C, the final rolling wire laying temperature is 800~850°C, the finishing rolling speed is 35m / s, the rolling specification is Φ7.0mm, the air cooling line controlled cooling rate is 20~30°C / s, and the grain size is ≤50μm.

7. The method for producing pure nickel N6 wire based on vacuum induction melting according to claim 1, characterized in that: In the above-mentioned S8, the staff needs to conduct a comprehensive inspection of the wire, including macrostructure analysis, inclusion rating and mechanical property testing. According to the inspection results, qualified products will be labeled and stored in the warehouse, while unqualified products will be returned for repair or scrapped.

8. The method for producing pure nickel N6 wire based on vacuum induction melting according to claim 1, characterized in that: The outer side of the vacuum induction melting furnace (1) is connected to a side pipe (2), and one end of the side pipe (2) away from the vacuum induction melting furnace (1) is connected to a vacuum pump (4). The top of the processing barrel (3) is connected to a connecting pipe (6). The gravity sedimentation component (5) includes a sedimentation box (51) arranged on the front surface of the vacuum pump (4). The bottom of the inner cavity of the sedimentation box (51) is fixedly connected to a first baffle (52). The bottom of the sedimentation box (51) is connected to a collection box (53), and the top of the inner cavity of the sedimentation box (51) is fixedly connected to a second baffle (54).

9. A method for producing pure nickel N6 wire based on vacuum induction melting according to claim 8, characterized in that: The rear surface of the sedimentation box (51) is connected to a first connecting pipe (7), the outer side of the first connecting pipe (7) is provided with a first connecting ring (8), the top of the sedimentation box (51) is connected to a second connecting pipe (9), the top of the second connecting pipe (9) is connected to the bottom of the connecting pipe (6), a PLC controller (10) is provided on the outer side of the processing barrel (3), the outer side of the second connecting pipe (9) is rotatably connected to a second connecting ring (11), and the top of the inner cavity of the processing barrel (3) is fixedly connected to a motor (12).

10. A method for producing pure nickel N6 wire based on vacuum induction melting according to claim 9, characterized in that: The output end of the motor (12) is fixedly connected to a stirring rod (13); the inner wall of the treatment barrel (3) is fixedly connected to a guide plate (14); the outer side of the stirring rod (13) is fixedly connected to a stirring blade (15); a through groove (16) is provided inside the stirring blade (15); the outer side of the treatment barrel (3) is connected to an air outlet pipe (17); the outer side of the treatment barrel (3) is fixedly connected to a liquid storage tank (18); the top of the liquid storage tank (18) is fixedly connected to a delivery pump (19); the liquid outlet of the delivery pump (19) is connected to a delivery pipe (20); the end of the delivery pipe (20) away from the delivery pump (19) is connected to a spray pipe (21); the bottom of the spray pipe (21) is connected to a spray head (22).

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