CN110951940B - Method for continuously casting nickel-based alloy by large-size round billet - Google Patents
Method for continuously casting nickel-based alloy by large-size round billet Download PDFInfo
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- CN110951940B CN110951940B CN201911329197.2A CN201911329197A CN110951940B CN 110951940 B CN110951940 B CN 110951940B CN 201911329197 A CN201911329197 A CN 201911329197A CN 110951940 B CN110951940 B CN 110951940B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/002—Stainless steels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a method for continuously casting a nickel-based alloy by a large-size round billet, which is suitable for the nickel-based alloy such as NO8810, NO8825 and the like, and comprises the following steps in sequence: the method comprises the following steps: refining: molten steel reaches a refining position, the components and slag systems are adjusted, then deslagging is carried out, and after VD vacuum treatment, calcium treatment and soft blowing are carried out for more than 15 minutes; step two: continuous casting: the method comprises the following steps of (1) adopting a split submerged nozzle for casting, wherein the depth of the submerged nozzle is 80-110 mm; the pulling speed is 0.16-0.22 m/min; adopting three-stage secondary cooling, wherein the specific water amount is 0.11-0.15L/kg; adding crystallization covering slag into the crystallizer, and adopting M + F-EMS combination electromagnetic stirring, and the third step: entering a pit for slow cooling; step four: forming a circular continuous casting billet with the diameter of 500 mm. The surface of the round billet continuously cast by the method does not need to be polished, and the requirements of subsequent electroslag remelting and forging can be met.
Description
Technical Field
The invention relates to the field of continuous casting production of nickel-based alloy, in particular to a method for continuously casting nickel-based alloy by adopting a large-size round billet of an arc continuous casting machine.
Background
The nickel-based alloy is an alloy with high strength and certain comprehensive performance such as oxidation and corrosion resistance at the high temperature of 650-1000 ℃, generally has the Ni content of more than 30 percent and the Ni content of common products of more than 50 percent, is generally applied to the high-temperature environment of more than 540 ℃ due to the super high-temperature mechanical strength and corrosion resistance, and is designed by selecting different alloys according to the use occasions, so that the nickel-based alloy is mainly applied to special corrosion-resistant environments, high-temperature corrosion environments and equipment with high-temperature mechanical strength. Is often applied to the fields of aerospace, energy, petrochemical industry or special electronics/photoelectricity and the like. The nickel-based corrosion-resistant alloys NO8810 and NO8825 continuously cast by the method have wide application range and large market consumption. At present, steel-making manufacturers adopt large-scale continuous casting nickel-based alloy to replace die casting production, so that the production cost is reduced, and the subsequent processing yield is improved.
The steel grade comprises the following chemical components:
the steel has high alloy content, the liquidus temperature is only about 1370-1400 ℃, and the steel contains more Ti and Al elements, has extremely poor continuous casting castability, is easy to generate nozzle nodulation and death and generates surface cracks in the casting process. Bringing great influence to the subsequent processing of products.
Disclosure of Invention
In order to solve the problem of the surface and internal quality of the nickel-based alloy continuously cast by the arc continuous casting machine: the invention relates to a method for continuously casting a nickel-based alloy by a large-size round billet, which is used for continuously casting a continuous casting billet to effectively control the defects of the surface and the core of the nickel-based alloy casting billet, wherein the surface has no crack, the central shrinkage cavity and the central crack are all less than 2.0 grades. Can meet the quality requirements of forging and electroslag remelting in the next process.
The method for continuously casting the nickel-based alloy by the large-size round billet comprises the following steps in sequence:
the method comprises the following steps: refining: a low-melting-point ternary slag system is adopted, foam slag submerged arc operation is adopted in the whole process, carbon powder is forbidden, carburetion is prevented, a small amount of aluminum oxide powder is added, argon operation is performed in the refining process, and slag dumping operation is performed after components are in place. Hanging molten steel to VD for vacuum treatment, calcium treatment after VD and soft blowing for more than 15 minutes, controlling the gas content [ O ] to be less than or equal to 40ppmv, [ N ] to be less than or equal to 300ppmv, and [ H ] to be less than or equal to 2 ppmv.
Step two: adopting an arc continuous casting machine for continuous casting, wherein the superheat degree is 30-45 ℃; casting by adopting a side-hole submerged nozzle, wherein the insertion depth of the submerged nozzle is 80-110 mm; the pulling speed is 0.16-0.22 m/min; adopting three-stage secondary cooling, wherein the specific water amount is 0.11-0.15L/kg; adding crystallization protective slag into a crystallizer, and adopting M + F-EMS combined electromagnetic stirring, wherein the current intensity of M-EMS (crystallizer electric stirring) is 350A, and the frequency is 3 Hz; the F-EMS (solidification end electric stirring) current intensity is 450A, the frequency is 7Hz, and the end electric stirring position is moved up by 2m aiming at the characteristics of quick cooling and slow drawing of the nickel-based alloy.
Step three: placing the blank in a pit for slow cooling, and performing red blank preheating treatment on the slow cooling pit before placing the blank in the pit; preheating to about 200 ℃.
Step four: forming a circular continuous casting billet with the diameter of 500 mm.
In the concrete case, the special crystalline mold flux is adopted in the second step: the melting point is 1085 ℃, the alkalinity is 0.90Pa.s, the viscosity (1300 ℃) is 1.6Poise, and the dosage of each ton of steel is 0.45-0.57 kg/t. The casting powder is specially developed for nickel-based alloy, the melting point of the casting powder is greatly reduced compared with that of the conventional casting powder so as to ensure good melting performance of the casting powder, and the alkalinity and the viscosity are designed to be lower values. The ingredients are shown in Table 1.
TABLE 1 crystallizer mold flux composition
| Composition (I) | SiO2 | CaO | MgO | Al2O3 | Fe2O3 | MnO2 | Na2O | K2O | F | C | H2O | Balance of |
| By weight% | 30.4 | 22.7 | 2.68 | 6.43 | 0.31 | 0.13 | 12.47 | 0.24 | 9.77 | 3.85 | 0.06 | Impurities |
Under the specific condition, the crystallizer adopts non-sinusoidal vibration, the vibration parameters select rated amplitude of 2.7mm, rated vibration frequency of 90 times/min, and non-sinusoidal rate of 25%.
In the concrete case, the water distribution ratio of the three-section type secondary cooling is as follows: 50:35: 15.
specifically, the nickel-based alloy to which the method of the present invention is applied is N08810, NO8825, or the like.
The invention continuously casts a circular continuous casting billet with the diameter of 500mm, the surface has no cracks, and the surface quality can be realized without grinding; the central shrinkage cavity and the central crack are both less than 2.0 grade. The method can be used for forging and electroslag remelting, and the yield is improved by 12-15% compared with die casting.
Detailed Description
The following will explain in detail the method for continuously casting a nickel-based alloy in a large-size round billet by using examples, but the method for implementing the present invention is not limited to the following examples.
Example one
I. This embodiment is the diameter of the cross section
The three-machine three-strand continuous casting machine is used for continuously casting the nickel-based alloy N08810 at the liquidus temperature of 1373 ℃.
II.65 tons of molten steel are put into an LF furnace for sampling and measuring 1556 ℃; electrifying and heating, adding 300kg of active lime, deoxidizing and slagging by using a 150 m aluminum wire, and adjusting the components by using electrolytic manganese according to the sample. When the temperature and the components basically meet the process requirements. Measuring the temperature at 1625 ℃, and performing deslagging operation.
And III, hoisting the ladle to a VD furnace base ladle, measuring the temperature to 1605 ℃, carrying out vacuum degassing treatment, keeping the vacuum degree to 0.35Pa after 8 minutes, and keeping the high vacuum for 14 minutes. After the air is broken, measuring the temperature, taking a gas sample and determining hydrogen on site; [ O ]: 24 ppmv; [ N ]: 280 ppmv; [H] the method comprises the following steps 0.9 ppmv. 650kg of ferrotitanium is added, and the Si-Ca cored wire with the diameter of 13mm is fed for 500 m. 60kg of covering agent of the ladle is added, the pressure of argon gas is adjusted to enable the liquid steel surface to slightly move, argon is softly blown for 15 minutes, the temperature is measured at 1525 ℃, and the ladle is hung to a continuous casting rotary table.
IV, pouring a large ladle, measuring the temperature of middle ladle to 1520 ℃, measuring the molten steel of the middle ladle to 14 tons, pouring the molten steel of the middle ladle firstly in the middle flow, then respectively pouring other flows, adding crystallizer covering slag and 140kg of tundish covering agent; the immersion nozzle is inserted to the depth of 120 mm. The melting point of the crystallizer casting powder is 1085 ℃, the alkalinity is 0.90, the viscosity (1300 ℃) is 1.6Poise, and the dosage of each ton of steel is 0.57 kg/t.
V, adopting non-sinusoidal vibration, selecting a vibration parameter with a rated amplitude of 2.7mm, a rated vibration frequency of 90 times/min and a non-sinusoidal rate of 25%. The water quantity of the crystallizer is 2900L/min, the specific water quantity is 0.11L/kg, three-section secondary cooling is adopted, and the water quantity distribution ratio is as follows: 50:35:15.
And VI, starting to pull at the speed of 0.10m/min, and slowly pulling the casting blank out of the crystallizer to the speed of 0.18 m/min. Casting blanks are discharged from a crystallizer by 1.2m, and the crystallizer is started to electromagnetically stir (350A/3 Hz); and pulling the casting blank to 10m, starting the tail end to perform electromagnetic stirring (stirring alternately at 450A/7Hz and 50s-5s-50 s), and moving the tail end to the upward stirring position for 2 m. Pouring for 15min, and measuring temperature to 1459 deg.C; the pulling speed is 0.18 m/min; measuring the temperature at 1455 deg.C in 25 min; the pulling speed is 0.18 m/min; measuring temperature 1448 ℃ for 35 min; the pulling speed is 0.21 m/min; and (4) stopping pouring flow by flow when the ladle is finished, the amount of the molten steel in the tundish is less than 13 tons, the speed is gradually and slowly reduced to 0.15m/min, and the amount of the residual steel in the tundish reaches 4 tons.
And VII, after the casting blank is cut by fire, quickly hanging the casting blank into a slow cooling pit preheated to about 200 ℃ by the red blank, wherein the temperature of the red blank entering the pit is 580 ℃.
VIII, the surface of the casting blank produced by the embodiment has no cracks, the surface does not need to be polished, and both the central shrinkage cavity and the central cracks are less than 2.0 levels.
Example two
I. This embodiment is the diameter of the cross section
The three-machine three-strand continuous casting is carried out on a continuous casting machine, and the continuous casting nickel-based alloy N08825 has a liquidus temperature of 1375 ℃.
II.68 tons of molten steel are sampled in an LF furnace and the temperature is measured to 1546 ℃; electrifying and heating, adding 300kg of active lime, deoxidizing and slagging by using a 150 m aluminum wire, and adjusting the components by using electrolytic manganese according to the sample. When the temperature and the components basically meet the process requirements. The temperature is measured to 1633 ℃, and deslagging is carried out.
And III, hoisting the ladle to a VD furnace base ladle, measuring the temperature by 1618 ℃, carrying out vacuum degassing treatment, keeping the vacuum degree to be 0.45Pa after 7 minutes, and keeping the high vacuum for 16 minutes. After the air is broken, measuring the temperature, taking a gas sample and determining hydrogen on site; [ O ]: 21 ppmv; [ N ]: 260 ppmv; [H] the method comprises the following steps 1.1 ppmv. Adding 2095kg of titanium iron and feeding 200m of pure calcium cored wires with the diameter of 9.5 mm. 60kg of covering agent of the ladle is added, the pressure of argon gas is adjusted to enable the liquid steel surface to slightly move, argon is softly blown for 15 minutes, the temperature is measured at 1523 ℃, and the ladle is hung to a continuous casting rotary table.
IV, pouring a large ladle, measuring the temperature of the middle ladle to 1518 ℃, pouring the middle ladle with molten steel of 11 tons, pouring the middle ladle with molten steel of 14 tons, pouring other flows respectively, adding crystallizer covering slag, and covering agent of 140kg in the middle ladle; the immersion nozzle is inserted to the depth of 120 mm. The melting point of the crystallizer casting powder is 1085 ℃, the alkalinity is 0.90, the viscosity (1300 ℃) is 1.6Poise, and the dosage of each ton of steel is 0.59 kg/t.
V, adopting non-sinusoidal vibration, selecting a vibration parameter with a rated amplitude of 2.7mm, a rated vibration frequency of 90 times/min and a non-sinusoidal rate of 25%. The water quantity of the crystallizer is 2900L/min, the specific water quantity is 0.11L/kg, three-section secondary cooling is adopted, and the water quantity distribution ratio is as follows: 50:35:15.
And VI, starting to pull at the speed of 0.10m/min, and slowly pulling the casting blank out of the crystallizer to the speed of 0.18 m/min. Casting blanks are discharged from a crystallizer by 1.2m, and the crystallizer is started to electromagnetically stir (350A/3 Hz); and pulling the casting blank to 10m, starting the tail end to perform electromagnetic stirring (stirring alternately at 450A/7Hz and 50s-5s-50 s), and moving the tail end to the upward stirring position for 2 m. Casting for 15min, and measuring temperature 1462 ℃; the pulling speed is 0.18 m/min; measuring the temperature at 1458 deg.C in 25 min; the pulling speed is 0.18 m/min; measuring the temperature at 1451 deg.C for 35 min; the pulling speed is 0.21 m/min; and (4) stopping pouring flow by flow when the ladle is finished, the amount of the molten steel in the tundish is less than 13 tons, the speed is gradually and slowly reduced to 0.15m/min, and the amount of the residual steel in the tundish reaches 4 tons.
And VII, after the casting blank is cut by fire, quickly hanging the casting blank into a slow cooling pit preheated to about 200 ℃ by the red blank, wherein the pit-entering temperature of the red blank is 585 ℃.
VIII, the surface of the casting blank produced by the embodiment has no cracks, the surface does not need to be polished, and both the central shrinkage cavity and the central cracks are less than 2.0 levels.
Claims (2)
1. A method for continuously casting a nickel-based alloy by a large-size round billet is applicable to the nickel-based alloys NO8810 and NO 8825; the method is characterized by comprising the following steps in sequence:
the method comprises the following steps: refining: molten steel reaches a refining position, components and slag systems are adjusted, then deslagging operation is carried out, VD vacuum treatment is carried out, calcium treatment is carried out after VD, soft blowing is carried out for more than 15 minutes, and gas content [ O ] is controlled to be less than or equal to 40ppmv, [ N ] is controlled to be less than or equal to 300ppmv, and [ H ] is controlled to be less than or equal to 2 ppmv;
step two: continuous casting: casting by adopting an arc continuous casting machine, wherein the superheat degree is controlled at 30-45 ℃; adopting a side hole submerged nozzle, wherein the depth of the submerged nozzle is 80-110 mm; the pulling speed is 0.16-0.22 m/min; three-stage secondary cooling is adopted; adding crystallization protective slag into a crystallizer, and adopting M + F-EMS combined electromagnetic stirring, wherein the current intensity of M-EMS (crystallizer electric stirring) is 350A, and the frequency is 3 Hz; F-EMS (solidification end electric stirring) current intensity is 450A, frequency is 7Hz, and the end electric stirring position is moved upwards for adjusting 2m aiming at the characteristics of quick cooling and slow drawing of the nickel-based alloy;
the crystallizer adopts non-sinusoidal vibration, the vibration parameters are selected to have the rated amplitude of 2.7mm, the rated vibration frequency of 90 times/min and the non-sinusoidal rate of 25 percent;
the water quantity of the crystallizer is 2900L/min, the specific water quantity is 0.11L/kg, and the water quantity distribution ratio of the three-stage secondary cooling is as follows: 50:35: 15;
the crystallization mold flux: the melting point is 1085 ℃, the alkalinity is 0.90Pa.s, the viscosity at 1300 ℃ is 1.6Poise, and the dosage of each ton of steel is 0.45-0.57 kg/t; the composition of the mold flux is shown in the following table:
Step three: placing the blank in a pit for slow cooling, and performing red blank preheating treatment on the slow cooling pit before placing the blank in the pit;
step four: forming a circular continuous casting billet with the diameter of 500 mm.
2. The method for large-size round billet continuous casting of the nickel-based alloy according to claim 1, wherein in the first step, the slag system is adjusted: active lime is used, and a small amount of aluminum oxide powder is added.
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| CN102899582A (en) * | 2011-07-25 | 2013-01-30 | 宝山钢铁股份有限公司 | High strength nickel base corrosion resistance alloy and manufacturing method thereof |
| CN110340315A (en) * | 2019-08-14 | 2019-10-18 | 江阴华润制钢有限公司 | A kind of method of big cross section rectangular billet caster martensitic stain less steel |
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| CN104668304A (en) * | 2013-11-26 | 2015-06-03 | 高玉树 | Technological method for producing nickel and nickel alloy tube in short process |
| CN105458205B (en) * | 2015-12-03 | 2017-12-19 | 攀钢集团成都钢钒有限公司 | The production method of high nickel steel Gr.8 continuous cast round billets |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102899582A (en) * | 2011-07-25 | 2013-01-30 | 宝山钢铁股份有限公司 | High strength nickel base corrosion resistance alloy and manufacturing method thereof |
| CN110340315A (en) * | 2019-08-14 | 2019-10-18 | 江阴华润制钢有限公司 | A kind of method of big cross section rectangular billet caster martensitic stain less steel |
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