CN111705269A - Low-silicon steel 27NiCrMoV15-6 and smelting continuous casting production process thereof - Google Patents
Low-silicon steel 27NiCrMoV15-6 and smelting continuous casting production process thereof Download PDFInfo
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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Abstract
The invention relates to a low silicon steel 27NiCrMoV15-6 and a smelting continuous casting production process thereof, which can realize the purposes of improving the yield of molten steel, reducing the labor intensity and ensuring the product quality, and the smelting continuous casting production process thereof.A multi-furnace continuous production becomes possible by adopting the process flow of batching → electric arc furnace smelting low carbon, low silicon and low phosphorus mother liquor → refining furnace reduction, desulfurization, alloying → VD vacuum refining furnace degassing → continuous casting, the yield of the molten steel is improved from 86 percent to more than 90 percent through the continuous casting production, the stable control of silicon is ensured through the selection of a deoxidizing material, the gas introduction in the steel casting process is reduced by adopting measures of long nozzle argon protection, tundish argon protection, ladle nozzle self-opening rate improvement and the like through the continuous casting, the increase of harmful gases such as oxygen, nitrogen and the like is reduced, and a qualified base metal is provided for electroslag.
Description
Technical Field
The invention belongs to the technical field of smelting of low-silicon steel pull rods for oil press machines, and particularly relates to low-silicon steel 27NiCrMoV15-6 capable of improving the yield of molten steel, reducing the labor intensity and ensuring the product quality and a smelting continuous casting production process thereof.
Background
The low-silicon steel 27NiCrMoV15-6 for the pull rod is characterized in that an electric arc furnace is generally adopted to melt scrap steel due to low silicon content, molten steel with low Si content is obtained by blowing oxygen and flowing slag, a refining furnace is reduced by a silicon-free deoxidizer and is alloyed, molten steel with low hydrogen, oxygen and nitrogen content is obtained after VD degassing, the molten steel is cast into an electrode blank, and the electrode blank is used as an electroslag parent metal for subsequent production after a riser is hot cut. With the increasingly intense market competition, finding a suitable smelting and casting production method is an effective way to avoid the above problems.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the low-silicon steel 27NiCrMoV15-6 and the smelting continuous casting production process thereof, which effectively improve the yield of the 27NiCrMoV15-6 molten steel, shorten the smelting process flow and reduce the labor intensity by optimizing the smelting process flow and the process.
The purpose of the invention is realized as follows:
the low-silicon steel 27NiCrMoV15-6 comprises the following components in percentage by mass in the smelting of the low-silicon steel 27NiCrMoV 15-6: 0.24-0.30% of C, 0.08-0.13% of Si, 0.20-0.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.006% of S, 1.50-1.80% of Cr, 0.25-0.45% of Mo, 0.05-0.15% of V, 3.40-4.40% of Ni, 0.010-0.030% of Al, less than or equal to 0.20% of Cu, less than or equal to 2.0ppm of H, less than or equal to 20ppm of O, less than or equal to 70ppm of N, and the balance of Fe.
A smelting continuous casting production process of low-silicon steel 27NiCrMoV15-6 comprises the following smelting process steps:
step 1), electric furnace ingredients comprise, by mass, more than two levels of scrap steel 20-30%, nickel steel stub 20-30%, pig iron 10-15%, steel scrap 35-45%, scrap steel and pit bottom materials with unknown sources are not allowed to be used, furnace burden is dry and free of impurities, and the furnace burden is added into an electric arc furnace through a material basket;
step 2), melting the raw materials in the step 1) through an electric arc furnace, decarburizing, dephosphorizing by flowing slag, sampling at 1580-1600 ℃ after furnace burden is melted down, wherein C is less than or equal to 0.15%, P is less than or equal to 0.005%, Si is less than or equal to 0.02%, the temperature is 1640-1670 ℃, tapping into a steel ladle, and adding 2-4 kg/t of aluminum blocks, 6-8 kg/t of lime and 6-9 kg/t of medium carbon ferrochrome into the steel ladle in the tapping process;
step 3), sending the molten steel tapped in the step 2) into a refining furnace for reduction deoxidation, desulfurization and component adjustment, wherein the chemical component target is adjusted as follows: 0.24-0.30% of C, 0.08-0.13% of Si, 0.22-0.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.006% of S, 1.50-1.80% of Cr, 0.25-0.45% of Mo, 0.05-0.15% of V, 3.40-4.40% of Ni, 0.030-0.060% of Al, and degassing by refining, bale hanging and VD station at the temperature of 1640-0 ℃;
step 4), hanging the molten steel processed in the step 3) into a VD tank for degassing treatment, hanging the molten steel into the VD tank, connecting argon to place a steel ladle into the VD tank, measuring the temperature of the molten steel, starting a VD tank cover and a cover, starting a vacuum pump to start degassing, keeping the vacuum degree of less than or equal to 0.70mbar for more than or equal to 20min, taking a chemical sample after breaking the vacuum, controlling residual Al to be between 0.010 and 0.030 percent, carrying out on-line hydrogen and oxygen determination, controlling [ H ] to be less than or equal to 1.3ppm and [ O ] to be less than or equal to 6ppm, taking a glass tube sample to analyze N and [ N ] to be less than or equal to 60ppm, feeding a calcium wire into the steel ladle for calcium treatment according to 0-0.4 m/t after the sample is qualified, carrying out weak stirring for more than or equal to 12 minutes, carrying out temperature of 5-1575 ℃, closing the argon, adding a steel cladding agent 1.0-1.5 kg/t, uniformly spreading, and;
step 5), hoisting the molten steel ladle in the step 4) to a continuous casting platform for temperature measurement, putting the molten steel ladle on a platform, sitting in a ladle turret, connecting a ladle nozzle hydraulic device, lifting a ladle frame, covering a ladle cover, stopping baking a tundish, lifting a ladle baking device, lifting a tundish car, checking an immersion nozzle, turning the tundish car to a pouring position and centering, rotating the ladle to the upper part of the tundish, sleeving a long nozzle, opening a hydraulic sliding nozzle for pouring, wherein the long nozzle is protected by argon blowing, and the argon flow is 80-120 NL/min; an argon blowing stopper is adopted as a tundish stopper, and the flow of argon is 2-6 NL/min; in the continuous casting process, an alkaline tundish covering agent and carbonized rice hulls are sequentially added into a tundish to reduce the heat radiation loss of molten steel and protect the molten steel from secondary oxidation, the adding amount is that the molten steel is covered on the molten steel surface, the superheat degree of the tundish is controlled to be 20-40 ℃, the pulling speed is controlled to be 0.18-0.22 m/min, the blank cutting length is as per a plan list, and the blank is directly sent by heat or enters an annealing furnace for annealing after being discharged.
In the step 2), the molten steel is promoted to be oxidized by blowing oxygen in the decarburization and dephosphorization processes of the electric arc furnace, silicon in the steel is removed to be 0.02 percent or less while decarburization is carried out, and silicon return after refining reduction is avoided by flowing off slag.
In the step 3), the molten steel after the steel is discharged in the step 2) is sent into a refining furnace for reduction deoxidation, desulfurization and component adjustment, 400-600 kg of lime is firstly added for power transmission and slag burning, 1-1.5 kg/t of calcium carbide, 0.5-3 kg/t of carbon powder and 0.5-3 kg/t of aluminum powder are adopted for desulfurization and reduction deoxidation during the period, a chemical sample is taken for analyzing components after the slag is white, the chemical components are adjusted according to the sample result, small batches of 0.5-2kg/t of carbon powder and 0.5-2kg/t of aluminum powder are used for deoxidation during the refining period, the reduction atmosphere is kept, the argon flow is well controlled during the whole refining process, the exposed steel liquid level is avoided, the deoxidation effect is enhanced by adopting the aluminum powder for deoxidation, and the Si content exceeding caused by using silicon-containing materials of silicon-iron.
In the step 3), the content of silicon is adjusted to be 0.08-0.13% according to the composition of the incoming sample in the step 2), so that a good deoxidation effect of the molten steel is ensured.
In the step 4) and the step 5), by ensuring that the degassing time is more than 22min under 0.7mbar and preventing gas increase measures in the continuous casting process, the measures of tundish argon blowing, ladle nozzle self-opening and long nozzle argon protection are adopted, and on the premise of ensuring lower gas content, the gas increase is reduced, the lower gas content is ensured, and high-quality base metal is provided for electroslag.
The invention has the following positive effects: the invention fully utilizes the characteristics of the high-impedance EAF.EBT, LF, IF, double-station VD/VOD and 2-machine 2-flow vertical continuous casting machine, die casting and other matched equipment of the existing production line, and breaks through the technological processes of low-silicon steel seed batching → electric arc furnace smelting low-carbon, low-silicon and low-phosphorus mother liquor → refining furnace reduction, desulfurization, alloying → VD vacuum refining furnace degassing → continuous casting, so that multi-furnace continuous production becomes possible, and the yield of the molten steel is improved from 86 percent to more than 90 percent through continuous casting production; the operations of mold swinging, chassis building, demolding and the like are reduced through continuous casting production, the labor intensity of workers is greatly reduced, and the production efficiency is improved. The gas introduction in the steel casting process is reduced by adopting measures of long nozzle argon protection, tundish argon protection, improvement of the ladle nozzle self-opening rate and the like in continuous casting, and the increase of harmful gases such as oxygen, nitrogen and the like is reduced.
Detailed Description
Example 1: the process flow of the invention is as follows: batching → melting stub bar, steel scrap in electric arc furnace, dephosphorization, decarbonization, desilication → deoxidation reduction in refining furnace, alloying → vacuum degassing → continuous casting steel casting → annealing in hot conveying or annealing furnace.
27NiCrMoV15-6 low silicon steel, wherein the smelted 27NiCrMoV15-6 low silicon steel comprises the following components in percentage by mass: 0.24-0.30% of C, 0.08-0.13% of Si, 0.20-0.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.006% of S, 1.50-1.80% of Cr, 0.25-0.45% of Mo, 0.05-0.15% of V, 0.010-0.030% of Al, 3.40-4.40% of Ni, less than or equal to 0.20% of Cu, less than or equal to 2.0ppm of H, less than or equal to 20ppm of O, less than or equal to 70ppm of N, and the balance of Fe.
A smelting continuous casting production process of drawn-down silicon steel 27NiCrMoV15-6 comprises the following smelting process steps:
step 1), the total tonnage of raw materials is 72 tons, and according to requirements: the electric furnace ingredients comprise, by mass, more than two levels of scrap steel 20-30%, nickel steel stub bars 20-30%, pig iron 10-15% and steel scrap 35-45%, the scrap steel and pit bottom materials with unknown sources are not allowed to be used, the materials are dry and free of impurities, and the furnace burden is added into an electric arc furnace through a material basket;
step 2), adding 700-900 kg of carburant into the raw materials obtained in the step 1) in the power transmission melting process of an electric arc furnace, gradually melting the furnace burden through power transmission, then starting an oxygen lance to perform decarburization, desiliconization and slag flowing dephosphorization, taking a chemical sample at the temperature of 1580-1600 ℃, tapping into a steel ladle at the temperature of 1640-1670 ℃, wherein the C is less than or equal to 0.15%, the P is less than or equal to 0.005%, the Si is less than or equal to 0.02%, and the steel ladle is filled with 2-4 kg/t of aluminum blocks, 6-8 kg/t of lime and 6-9 kg/t of medium carbon ferrochrome;
step 3), sending the molten steel after the steel is discharged in the step 2) into a refining furnace for reduction deoxidation, desulfurization and component adjustment, firstly adding 400-600 kg of lime and transmitting power to burn slag, adopting 1-1.5 kg/t of calcium carbide, 0.5-3 kg/t of carbon powder and 0.5-3 kg/t of aluminum powder for desulfurization and reduction deoxidation during the process, measuring the temperature after the slag is white, sampling and analyzing chemical components, adjusting the chemical components according to the sample result, and adjusting the chemical component targets as follows: 0.24-0.30% of C, 0.08-0.13% of Si, 0.22-0.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.006% of S, 1.50-1.80% of Cr, 0.25-0.45% of Mo, 0.05-0.15% of V, 3.40-4.40% of Ni, 0.030-0.060% of Al, deoxidizing and maintaining a reducing atmosphere in small batches and multiple batches of carbon powder 0.5-2kg/t and aluminum powder 0.5-2kg/t during refining, controlling the flow of argon in the whole refining process, avoiding the liquid level of bare steel, and hanging and turning a VD station at the temperature of 1680-1640 ℃;
step 4), hanging the molten steel processed in the step 3) to a VD station for degassing treatment, hanging the molten steel to a VD tank, connecting argon to place a steel ladle into the VD tank, measuring the temperature of the molten steel by using a temperature measuring gun, starting a VD tank cover and a cover, starting a vacuum pump to start degassing, keeping the vacuum degree of less than or equal to 0.70mbar for more than or equal to 20min, breaking the vacuum, taking a chemical sample, controlling residual Al0.010-0.030%, carrying out on-line hydrogen and oxygen determination, controlling [ H ] to be less than or equal to 1.3ppm and [ O ] to be less than or equal to 6.0ppm, taking a glass tube sample to analyze N and [ N ] to be less than or equal to 60ppm, feeding a calcium wire into the steel ladle for calcium treatment according to 0.3m/t after the sample is qualified, carrying out weak stirring for more than or equal to 12 min, carrying out temperature of 5-1575 ℃, closing the argon, adding 1.0-1.5 kg/t of a steel cladding agent, uniformly;
step 5), hoisting the molten steel ladle in the step 4) to a continuous casting platform for temperature measurement, putting the molten steel ladle on a platform, sitting in a ladle turret, connecting a ladle nozzle hydraulic device, lifting a ladle frame, covering a ladle cover, stopping baking a tundish, lifting a ladle baking device, lifting a tundish car, checking an immersion nozzle, turning the tundish car to a pouring position and centering, rotating the ladle to the upper part of the tundish, sleeving a long nozzle, opening a hydraulic sliding nozzle for pouring, wherein the long nozzle is protected by argon blowing, and the argon flow is 80-120 NL/min; an argon blowing stopper is adopted as a tundish stopper, and the flow of argon is 2-6 NL/min; in the continuous casting process, an alkaline tundish covering agent and carbonized rice hulls are sequentially added into a tundish to reduce the heat radiation loss of molten steel and protect the molten steel from secondary oxidation, the adding amount is that the molten steel is covered on the molten steel surface, the superheat degree of the tundish is controlled to be 20-40 ℃, the pulling speed is controlled to be 0.18-0.22 m/min, the blank cutting length is as per a plan list, and the blank is directly sent by heat or enters an annealing furnace for annealing after being discharged.
The chemical compositions of the examples are shown in Table 1.
Table 1 examples after-furnace chemical composition (%)
Claims (6)
1. A low silicon steel 27NiCrMoV15-6, characterized in that: the smelting low-silicon steel 27NiCrMoV15-6 comprises the following components in percentage by mass: 0.24-0.30% of C, 0.08-0.13% of Si, 0.20-0.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.006% of S, 1.50-1.80% of Cr, 0.25-0.45% of Mo, 0.05-0.15% of V, 3.40-4.40% of Ni, 0.010-0.030% of Al, less than or equal to 0.20% of Cu, less than or equal to 2.0ppm of H, less than or equal to 20ppm of O, less than or equal to 70ppm of N, and the balance of Fe.
2. A smelting continuous casting production process of low-silicon steel 27NiCrMoV15-6 is characterized by comprising the following steps: the method comprises the following smelting process steps:
step 1), electric furnace ingredients comprise, by mass, more than two levels of scrap steel 20-30%, nickel steel stub 20-30%, pig iron 10-15%, steel scrap 35-45%, scrap steel and pit bottom materials with unknown sources are not allowed to be used, furnace burden is dry and free of impurities, and the furnace burden is added into an electric arc furnace through a material basket;
step 2), melting the raw materials in the step 1) through an electric arc furnace, decarburizing, dephosphorizing by flowing slag, sampling at 1580-1600 ℃ after furnace burden is melted down, wherein C is less than or equal to 0.15%, P is less than or equal to 0.005%, Si is less than or equal to 0.02%, the temperature is 1640-1670 ℃, tapping into a steel ladle, and adding 2-4 kg/t of aluminum blocks, 6-8 kg/t of lime and 6-9 kg/t of medium carbon ferrochrome into the steel ladle in the tapping process;
step 3), sending the molten steel tapped in the step 2) into a refining furnace for reduction deoxidation, desulfurization and component adjustment, wherein the chemical component target is adjusted as follows: 0.24-0.30% of C, 0.08-0.13% of Si, 0.22-0.40% of Mn, less than or equal to 0.010% of P, less than or equal to 0.006% of S, 1.50-1.80% of Cr, 0.25-0.45% of Mo, 0.05-0.15% of V, 3.40-4.40% of Ni, 0.030-0.060% of Al, and degassing by refining, bale hanging and VD station at the temperature of 1640-0 ℃;
step 4), hanging the molten steel processed in the step 3) into a VD tank for degassing treatment, hanging the molten steel into the VD tank, connecting argon to place a steel ladle into the VD tank, measuring the temperature of the molten steel, starting a VD tank cover and a cover, starting a vacuum pump to start degassing, keeping the vacuum degree of less than or equal to 0.70mbar for more than or equal to 20min, taking a chemical sample after breaking the vacuum, controlling residual Al to be between 0.010 and 0.030 percent, carrying out on-line hydrogen and oxygen determination, controlling [ H ] to be less than or equal to 1.3ppm and [ O ] to be less than or equal to 6ppm, taking a glass tube sample to analyze N and [ N ] to be less than or equal to 60ppm, feeding a calcium wire into the steel ladle for calcium treatment according to 0-0.4 m/t after the sample is qualified, carrying out weak stirring for more than or equal to 12 minutes, carrying out temperature of 5-1575 ℃, closing the argon, adding a steel cladding agent 1.0-1.5 kg/t, uniformly spreading, and;
step 5), hoisting the molten steel ladle in the step 4) to a continuous casting platform for temperature measurement, putting the molten steel ladle on a platform, sitting in a ladle turret, connecting a ladle nozzle hydraulic device, lifting a ladle frame, covering a ladle cover, stopping baking a tundish, lifting a ladle baking device, lifting a tundish car, checking an immersion nozzle, turning the tundish car to a pouring position and centering, rotating the ladle to the upper part of the tundish, sleeving a long nozzle, opening a hydraulic sliding nozzle for pouring, wherein the long nozzle is protected by argon blowing, and the argon flow is 80-120 NL/min; an argon blowing stopper is adopted as a tundish stopper, and the flow of argon is 2-6 NL/min; in the continuous casting process, an alkaline tundish covering agent and carbonized rice hulls are sequentially added into a tundish to reduce the heat radiation loss of molten steel and protect the molten steel from secondary oxidation, the adding amount is that the molten steel is covered on the molten steel surface, the superheat degree of the tundish is controlled to be 20-40 ℃, the pulling speed is controlled to be 0.18-0.22 m/min, the blank cutting length is as per a plan list, and the blank is directly sent by heat or enters an annealing furnace for annealing after being discharged.
3. The smelting continuous casting production process of the low silicon steel 27NiCrMoV15-6 according to claim 2, characterized in that: in the step 2), the molten steel is promoted to be oxidized by blowing oxygen in the decarburization and dephosphorization processes of the electric arc furnace, silicon in the steel is removed to be 0.02 percent or less while decarburization is carried out, and silicon return after refining reduction is avoided by flowing off slag.
4. The smelting continuous casting production process of the low silicon steel 27NiCrMoV15-6 according to claim 2, characterized in that: in the step 3), the molten steel after the steel is discharged in the step 2) is sent into a refining furnace for reduction deoxidation, desulfurization and component adjustment, 400-600 kg of lime is firstly added for power transmission and slag burning, 1-1.5 kg/t of calcium carbide, 0.5-3 kg/t of carbon powder and 0.5-3 kg/t of aluminum powder are adopted for desulfurization and reduction deoxidation during the period, a chemical sample is taken for analyzing components after the slag is white, the chemical components are adjusted according to the sample result, small batches of 0.5-2kg/t of carbon powder and 0.5-2kg/t of aluminum powder are used for deoxidation during the refining period, the reduction atmosphere is kept, the argon flow is well controlled during the whole refining process, the exposed steel liquid level is avoided, the deoxidation effect is enhanced by adopting the aluminum powder for deoxidation, and the Si content exceeding caused by using silicon-containing materials of silicon-iron.
5. The smelting continuous casting production process of the low silicon steel 27NiCrMoV15-6 according to claim 2, characterized in that: in the step 3), the content of silicon is adjusted to be 0.08-0.13% according to the composition of the incoming sample in the step 2), so that a good deoxidation effect of the molten steel is ensured.
6. The smelting continuous casting production process of the low silicon steel 27NiCrMoV15-6 according to claim 2, characterized in that: in the step 4) and the step 5), by ensuring that the degassing time is more than 20min under 0.7mbar and preventing gas increase measures in the continuous casting process, the measures of tundish argon blowing, ladle nozzle self-opening and long nozzle argon protection are adopted, and on the premise of ensuring lower gas content, the gas increase is reduced, the lower gas content is ensured, and high-quality base metal is provided for electroslag.
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