CN115505820A - Continuous casting method of niobium-containing high-nitrogen nickel-based alloy - Google Patents
Continuous casting method of niobium-containing high-nitrogen nickel-based alloy Download PDFInfo
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000009749 continuous casting Methods 0.000 title claims abstract description 42
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 31
- 239000000956 alloy Substances 0.000 title claims abstract description 31
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 31
- 239000010955 niobium Substances 0.000 title claims abstract description 31
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 31
- 229910052758 niobium Inorganic materials 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 17
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 238000005266 casting Methods 0.000 claims abstract description 44
- 238000005452 bending Methods 0.000 claims abstract description 32
- 238000002844 melting Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 15
- 238000007670 refining Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 69
- 239000010959 steel Substances 0.000 claims description 69
- 239000000498 cooling water Substances 0.000 claims description 28
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 24
- 229910052782 aluminium Inorganic materials 0.000 claims description 18
- 238000007664 blowing Methods 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 18
- 238000010079 rubber tapping Methods 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 17
- 229910052717 sulfur Inorganic materials 0.000 claims description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 15
- 229910052721 tungsten Inorganic materials 0.000 claims description 15
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 14
- 229910000863 Ferronickel Inorganic materials 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 238000005275 alloying Methods 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 9
- 229910001356 Nickel pig iron Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910000592 Ferroniobium Inorganic materials 0.000 claims description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 239000006187 pill Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000005262 decarbonization Methods 0.000 claims description 5
- -1 aluminum-and titanium-nickel Chemical compound 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 238000009847 ladle furnace Methods 0.000 description 24
- 229910052804 chromium Inorganic materials 0.000 description 10
- 229910052710 silicon Inorganic materials 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 9
- 229910052748 manganese Inorganic materials 0.000 description 9
- 229910052750 molybdenum Inorganic materials 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/023—Alloys based on nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention belongs to the field of steelmaking, and discloses a continuous casting method of a niobium-containing high-nitrogen nickel-based alloy, which comprises the following process steps: an alloy melting furnace or an electric furnace → an AOD furnace → LF ladle refining → continuous casting; the invention greatly improves the product yield and production efficiency, stabilizes the product quality, reduces the production cost and realizes the continuous casting metal yield of 92-96 percent by using the wide-width vertical bending type slab caster for casting.
Description
Technical Field
The invention belongs to the field of steelmaking, and relates to a continuous casting method of a niobium-containing high-nitrogen nickel-based alloy.
Background
The nickel-based alloy, particularly the niobium-containing high-nitrogen type alloy, contains higher alloy elements such as niobium, nitrogen and the like, has the characteristics of excellent heat resistance, corrosion resistance, good comprehensive mechanical properties and the like, and is widely applied to the fields of photovoltaic polycrystalline silicon cold hydrogenation high-parameter reactors and the like.
The niobium-containing high-nitrogen nickel-based alloy is usually smelted by a vacuum induction furnace and remelted by a vacuum consumable furnace or an electroslag furnace, the hot working adopts casting and rolling processes, the product quality is unstable, the production cost is high, the product yield and the production efficiency are low, so that the contradiction between supply and demand is prominent, and the wide use and the industrial production of the product are seriously restricted.
Therefore, the manufacturing method that the niobium-containing high-nitrogen nickel-based alloy is smelted by a large stainless steel refining furnace and cast by a wide-width vertical bending type slab continuous casting machine is provided, which is a problem of urgent attention.
The invention aims to provide a continuous casting method of a niobium-containing high-nitrogen nickel-based alloy, which greatly improves the yield and production efficiency of products, stabilizes the product quality, reduces the production cost and realizes the high-efficiency and stable production of a wide-width vertical bending type slab continuous casting machine.
Disclosure of Invention
The invention aims to solve the problems and provide a continuous casting method of a niobium-containing high-nitrogen nickel-based alloy.
The purpose of the invention is realized as follows: a continuous casting method of a niobium-containing high-nitrogen nickel-based alloy comprises the following chemical components in percentage by weight: c:0.02-0.10%, less than or equal to 0.30% of Si, less than or equal to 1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.002% of S, cr:23.0-27.0%, ni:35.0-39.0%, al is less than or equal to 0.40%, ti is less than or equal to 0.20%, nb:0.40-0.90%, mo is less than or equal to 2.5%, cu is less than or equal to 0.5%, N:0.15-0.30%, W is less than or equal to 2.5%, co is less than or equal to 3.0%, B is less than or equal to 0.010%, and the balance is Fe and unavoidable substances.
A continuous casting method of niobium-containing high-nitrogen nickel-based alloy comprises the following process steps: an alloy melting furnace or an electric furnace → an AOD furnace → LF ladle refining → continuous casting; melting high-carbon ferrochrome, chrome-nickel pig iron and ferronickel in an alloy melting furnace or an electric furnace by equipment, adding the melted high-carbon ferrochrome, chrome-nickel pig iron and ferronickel into an AOD furnace, adding ferronickel, a nickel plate and high-carbon ferrochrome into the AOD furnace in the oxygen blowing and decarbonizing process for alloying, wherein the Cr yield is 94-96 percent, the Ni yield is 97-99 percent, adding ferrosilicon for reducing for 12-15min at the end of decarbonization at a ratio of 20-24kg/t, and tapping after the reduction is finished; the AOD furnace steel tapping comprises the following components: c:0.05-0.08%, si:0.05-0.20%, mn is less than or equal to 1.50%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr:23.0-27.0%, ni:35.0-39.0%, al is less than or equal to 0.40%, ti is less than or equal to 0.20%, nb is less than or equal to 0.10%, mo is less than or equal to 2.5%, cu is less than or equal to 0.5%, N:0.15-0.25%, W is less than or equal to 2.5%, co is less than or equal to 3.0%, B is less than or equal to 0.010%, and the balance of Fe and unavoidable substances; carrying out slag skimming operation after tapping of the AOD furnace, and removing steel slag in a steel ladle, wherein the thickness of the steel slag is 100-150mm; lifting the steel ladle to an LF furnace after slagging off, adding 1-2kg/t of aluminum pills into the LF furnace for deoxidation, adding ferroniobium for alloying, wherein the Nb yield is 95-99%, the argon gas supply intensity of steel ladle bottom blowing is 6-8Nl/min/t, the stirring time is 10-15min, the argon gas supply intensity of steel ladle bottom blowing is adjusted to 3-5Nl/min/t, the molten steel temperature is reduced, and when the molten steel temperature reaches 1440-1450 ℃, the treatment is finished; the LF furnace comprises the following components after treatment is finished: c:0.05-0.08%, si:0.10-0.30%, mn is less than or equal to 1.50%, P is less than or equal to 0.020%, S is less than or equal to 0.002%, cr:23.0-27.0%, ni:35.0-39.0%, al is less than or equal to 0.40%, ti is less than or equal to 0.20%, nb:0.50-0.80%, mo is less than or equal to 2.5%, cu is less than or equal to 0.5%, N:0.15 to 0.25 percent of the total weight of the alloy, less than or equal to 2.5 percent of W, less than or equal to 3.0 percent of Co, less than or equal to 0.010 percent of B, and the balance of Fe and inevitable substances; after the LF furnace treatment is finished, the steel ladle is lifted to a wide vertical bending type slab continuous casting machine, the casting blank width range is 1000-2150mm, the pulling speed is set to be 0.15-0.25m/min when continuous casting is started, the pulling speed is increased to be 0.35-0.45 m/min after the casting is started for 0.5-1 min, the pulling speed is increased to be a target pulling speed after the casting is started for 2-4min, wherein the corresponding pulling speed range is 0.65-0.75m/min when casting a casting blank with the width of 1000-1500mm, the target pulling speed is 0.7 m/min, and the corresponding pulling speed range is 0.5 when casting a casting blank with the width of 1501-2150mm5-0.65 m/min, target drawing speed of 0.60 m/min and tundish molten steel temperature of 1410-1420 ℃; in the casting process, the cooling water flow of the crystallizer is 160-170 m 3 And/h, controlling the seedling emergence time to be 70-80s, reducing the cooling speed of the molten steel in the crystallizer, and improving the shell thickness in the casting stage, thereby improving the tensile stress capacity of the aluminum-and titanium-nickel-based alloy casting blank.
In the casting process, in order to prevent tensile stress cracks during casting blank straightening, a weak cooling mode is adopted before a secondary cooling water bending section, wherein the secondary cooling water quantity of a side guide roller Z1N area is 40 +/-2L/min, the secondary cooling water quantity of a foot roller Z1 IO area is 120 +/-2L/min, the secondary cooling water quantity of a bending section Z2 IOC area is 130 +/-2L/min, the secondary cooling water quantity of a bending section Z2 IOM area is 130 +/-2L/min, the secondary cooling water quantity of a bending section Z3 IOC area is 120 +/-2L/min, the secondary cooling water quantity of a bending section Z3 IOM area is 120 +/-2L/min, the secondary cooling water quantity of a bending section Z4 IOC area is 100 +/-2 zxft 3238/min, and the secondary cooling water quantity of a bending section Z4 IOM area is 100 +/-2 zxft 3262/min.
The invention has the beneficial effects that: the invention greatly improves the product yield and production efficiency, stabilizes the product quality, reduces the production cost and realizes the continuous casting metal yield of 92-96 percent by using the wide-width vertical bending type slab caster for casting.
Detailed Description
The national standard component requirements of the N08120 of the invention are as follows:
C：0.02-0.10%，Si≤1.00%，Mn≤1.50%，P≤0.040%，S≤0.030%，Cr：23.0-27.0%，Ni：35.0-39.0%，Al≤0.40%，Ti≤0.20%，Nb：0.40-0.90%，Mo≤2.5%，Cu≤0.5%，N：0.15-0.30%，W≤2.5%，Co≤3.0%，B≤0.010%。
the balance of Fe and inevitable substances.
In order to ensure the performance of N08120, the contents of Si, P, S and elements need to be further reduced in the actual production process, and the control range is as follows:
Si≤0.30%，P≤0.020%，S≤0.002%。
the process links comprise: an alloy melting furnace or an electric furnace → an AOD furnace → LF ladle refining → continuous casting.
Melting high carbon ferrochrome, chromium-nickel pig iron and ferronickel by an alloy melting furnace or an electric furnace and other equipment, adding into an AOD furnace, adding ferronickel, a nickel plate and high carbon ferrochrome for alloying in the process of blowing oxygen for decarburization of the AOD furnace (the Cr yield is 94-96 percent and the Ni yield is 97-99 percent), adding ferrosilicon (20-24 kg/t) for reduction for 12-15min after decarburization is finished, and tapping after reduction is finished.
The AOD furnace steel tapping comprises the following components:
C：0.05-0.08%，Si：0.05-0.20%，Mn≤1.50%，P≤0.020%，S≤0.010%，Cr：23.0-27.0%，Ni：35.0-39.0%，Al≤0.40%，Ti≤0.20%，Nb≤0.10%，Mo≤2.5%，Cu≤0.5%，N：0.15-0.25%，W≤2.5%，Co≤3.0%，B≤0.010%。
the balance of Fe and inevitable substances.
And carrying out slag skimming operation after tapping of the AOD furnace, and removing steel slag in the steel ladle, wherein the thickness of the steel slag is 100-150mm.
Lifting the steel ladle to an LF furnace after slagging off, adding 1-2kg/t of aluminum pills into the LF furnace for deoxidation, adding ferroniobium for alloying (the Nb yield is 95-99%), adjusting the argon gas supply intensity of the steel ladle bottom blowing to be 6-8Nl/min/t, stirring for 10-15min, adjusting the argon gas supply intensity of the steel ladle bottom blowing to be 3-5Nl/min/t, reducing the temperature of molten steel, and finishing the treatment when the temperature of the molten steel reaches 1440-1450 ℃.
The LF furnace comprises the following components after treatment is finished:
C：0.05-0.08%，Si：0.10-0.30%，Mn≤1.50%，P≤0.020%，S≤0.002%，Cr：23.0-27.0%，Ni：35.0-39.0%，Al≤0.40%，Ti≤0.20%，Nb：0.50-0.80%，Mo≤2.5%，Cu≤0.5%，N：0.15-0.25%，W≤2.5%，Co≤3.0%，B≤0.010%。
the balance of Fe and inevitable substances.
After the LF furnace treatment is finished, the ladle is lifted to a wide-width vertical bending type slab continuous casting machine (the width range of the casting blank is 1000-2150 mm). When continuous casting is started, the pulling speed is set to be 0.15-0.25m/min, after the casting is started for 0.5-1 min, the pulling speed is increased to be 0.35-0.45 m/min, after the casting is started for 2-4min, the pulling speed is increased to be a target pulling speed, wherein the pulling speed range corresponding to casting blanks with the width of 1000-1500mm is 0.65-0.75m/min, the target pulling speed is 0.7 m/min, the pulling speed range corresponding to casting blanks with the width of 1501-2150mm is 0.55-0.65 m/min, and the target pulling speed is 0.60 m/min. The temperature of the tundish molten steel is 1410-1420 ℃.
In the casting process, the crystallizerThe cooling water flow is 160-170 m 3 And h, controlling the seedling emergence time to be 70-80s, reducing the cooling speed of molten steel in the crystallizer, and improving the shell thickness of a casting blank in the casting stage, thereby improving the tensile stress capacity of the casting blank containing aluminum and titanium-nickel base alloy.
In order to prevent tensile stress cracks from occurring during the straightening of a casting blank, a weak cooling mode is adopted before a secondary cooling water bending section, and the given water amount in front of the bending section is as follows:
and after the casting is finished, the yield of the continuous casting metal is 92-96%.
Example 1
Melting high-carbon ferrochrome, chrome-nickel pig iron and ferronickel in an alloy melting furnace, adding into an AOD furnace, adding ferronickel, a nickel plate and high-carbon ferrochrome for alloying in the oxygen blowing and decarbonizing process of the AOD furnace, adding ferrosilicon 22.1kg/t after the decarbonization is finished, reducing for 13min, obtaining the Cr yield of 95.1 percent and the Ni yield of 98.6 percent, and tapping after the reduction is finished.
The AOD furnace steel tapping comprises the following components:
C：0.06%，Si：0.12%，Mn:0.23%，P:0.017%，S:0.008%，Cr：24.1%，Ni：36.2%，Al:0.006%，Ti:0.001%，Nb:0.005%，Mo:0.012%，Cu:0.010%，N：0.21%，W:0.001%，Co:0.10%，B:0.002%。
the balance of Fe and inevitable substances.
Carrying out slag skimming operation after tapping of the AOD furnace, removing steel slag in a steel ladle, wherein the steel slag is thick: 135mm.
And lifting the steel ladle to an LF (ladle furnace) after slagging off, adding 1.5kg/t of aluminum pills into the LF to deoxidize, adding ferroniobium into the LF to perform alloying (the Nb yield is 98%), controlling the steel ladle bottom argon blowing gas supply intensity to be 7Nl/min/t, stirring for 12min, adjusting the steel ladle bottom argon blowing gas supply intensity to be 4Nl/min/t, reducing the molten steel temperature, and finishing the treatment when the molten steel temperature reaches 1443 ℃.
The LF furnace comprises the following components after treatment is finished:
C：0.07%，Si：0.23%，Mn:0.23%，P:0.017%，S:0.001%，Cr：23.9%，Ni：35.8%，Al:0.010%，Ti:0.001%，Nb：0.56%，Mo:0.012%，Cu:0.010%，N：0.21%，W:0.001%，Co:0.10%，B:0.002%。
the balance of Fe and inevitable substances.
After the LF treatment is finished, the steel ladle is lifted to a wide-width vertical bending type slab continuous casting machine (the width of a casting blank is 2050 mm). When the continuous casting is started, the pulling speed is set to be 0.21m/min, the pulling speed is increased to be 0.40m/min after the continuous casting is started for 50s, and the pulling speed is increased to be 0.61 m/min after the continuous casting is started for 3min32 s. The temperature of the tundish molten steel is 1414 ℃.
In the casting process, the cooling water flow of the crystallizer is 167 m3/h, and the seedling emergence time is controlled to be 76s.
The weak cooling mode is adopted before the secondary cooling water bending section, and the given water amount before the bending section is as follows:
after the casting, the yield of the continuous casting metal is 94.1 percent.
Example 2
Melting high-carbon ferrochrome, chrome-nickel pig iron and ferronickel in an alloy melting furnace, adding into an AOD furnace, adding ferronickel, a nickel plate and high-carbon ferrochrome for alloying in the oxygen blowing and decarbonizing process of the AOD furnace, adding 23.5kg/t of ferrosilicon after the decarbonization is finished, reducing for 15min, obtaining 95.5 percent of Cr and 98.4 percent of Ni, and tapping after the reduction is finished.
The AOD furnace steel tapping comprises the following components:
C：0.05%，Si：0.18%，Mn:0.24%，P:0.019%，S:0.005%，Cr：24.5%，Ni：36.3%，Al:0.005%，Ti:0.001%，Nb:0.004%，Mo:0.010%，Cu:0.010%，N：0.22%，W:0.001%，Co:0.16%，B:0.001%。
the balance of Fe and inevitable substances.
Carrying out slag skimming operation after tapping of the AOD furnace, removing steel slag in a steel ladle, wherein the steel slag is thick: 130mm.
Lifting the steel ladle to an LF furnace after slagging off, adding 1.6kg/t of aluminum pills into the LF furnace for deoxidation, adding ferroniobium for alloying (the Nb yield is 97%), adjusting the argon gas supply intensity of steel ladle bottom blowing to be 8Nl/min/t, stirring for 13min, adjusting the argon gas supply intensity of steel ladle bottom blowing to be 5Nl/min/t, reducing the temperature of molten steel, and finishing the treatment when the temperature of the molten steel reaches 1445 ℃.
The LF furnace comprises the following components after treatment is finished:
C：0.06%，Si：0.25%，Mn:0.24%，P:0.019%，S:0.001%，Cr：24.3%，Ni：36.2%，Al:0.009%，Ti:0.001%，Nb：0.55%，Mo:0.011%，Cu:0.010%，N：0.22%，W:0.001%，Co:0.17%，B:0.001%。
the balance of Fe and inevitable substances.
After the LF furnace treatment is finished, the steel ladle is lifted to a wide-width vertical bending type slab continuous casting machine (the casting blank width is 1550 mm). When the continuous casting is started, the pulling speed is set to be 0.20m/min, after the continuous casting is started for 45s, the pulling speed is increased to be 0.41m/min, and after the continuous casting is started for 3min and 15s, the pulling speed is increased to be the target pulling speed of 0.70 m/min. The tundish molten steel temperature is 1415 ℃.
In the casting process, the cooling water flow of the crystallizer is 165 m3/h, and the seedling emergence time is controlled to be 76s.
The weak cooling mode is adopted before the secondary cooling water bending section, and the given water amount before the bending section is as follows:
and after the casting is finished, the yield of the continuous casting metal is 92.5 percent.
Example 3
High-carbon ferrochrome, chrome-nickel pig iron and ferronickel are melted by an alloy melting furnace and added into an AOD furnace, ferronickel, a nickel plate and high-carbon ferrochrome are added for alloying in the oxygen blowing and decarbonizing process of the AOD furnace, 23.2kg/t of ferrosilicon is added after the decarbonization is finished, the reduction is carried out for 14min, the Cr yield is 94.9 percent, the Ni yield is 97.8 percent, and steel is discharged after the reduction is finished.
The AOD furnace steel tapping comprises the following components:
C：0.06%，Si：0.15%，Mn:0.20%，P:0.020%，S:0.009%，Cr：24.3%，Ni：36.1%，Al:0.005%，Ti:0.001%，Nb:0.005%，Mo:0.011%，Cu:0.009%，N：0.21%，W:0.001%，Co:0.21%，B:0.001%。
the balance of Fe and inevitable substances.
Carrying out slag skimming operation after tapping of the AOD furnace, removing steel slag in a steel ladle, wherein the steel slag is thick: 125mm.
Lifting the steel ladle to an LF furnace after slagging off, adding 1.3kg/t of aluminum pills into the LF furnace for deoxidation, adding ferroniobium for alloying (the Nb yield is 98%), adjusting the argon gas supply intensity of steel ladle bottom blowing to be 7Nl/min/t, stirring for 11min, adjusting the argon gas supply intensity of steel ladle bottom blowing to be 4Nl/min/t, reducing the temperature of molten steel, and finishing the treatment when the temperature of the molten steel reaches 1444 ℃.
The LF furnace comprises the following components after treatment is finished:
C：0.07%，Si：0.22%，Mn:0.22%，P:0.020%，S:0.001%，Cr：24.0%，Ni：35.9%，Al:0.015%，Ti:0.001%，Nb：0.57%，Mo:0.011%，Cu:0.010%，N：0.20%，W:0.001%，Co:0.21%，B:0.001%。
the balance of Fe and inevitable substances.
After the LF furnace treatment is finished, the steel ladle is lifted to a wide-width vertical bending type slab continuous casting machine (the casting blank width is 1550 mm). When the continuous casting is started, the pulling speed is set to be 0.22m/min, the pulling speed is increased to be 0.40m/min after the continuous casting is started for 51s, and the pulling speed is increased to be 0.69 m/min after the continuous casting is started for 3min and 10 s. Tundish molten steel temperature 1418 ℃.
In the casting process, the cooling water flow of the crystallizer is 168 m3/h, and the seedling emergence time is controlled to be 69s.
The weak cooling mode is adopted before the secondary cooling water bending section, and the given water amount before the bending section is as follows:
after the casting, the yield of the continuous casting metal is 94.0 percent.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (3)
1. A continuous casting method of niobium-containing high-nitrogen nickel-based alloy is characterized by comprising the following steps: the niobium-containing high-nitrogen nickel-based alloy comprises the following chemical components in percentage by weight: c:0.02-0.10%, less than or equal to 0.30% of Si, less than or equal to 1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.002% of S, cr:23.0-27.0%, ni:35.0 to 39.0 percent of Al, less than or equal to 0.40 percent of Al, ti is less than or equal to 0.20 percent, nb:0.40-0.90%, mo is less than or equal to 2.5%, cu is less than or equal to 0.5%, N:0.15-0.30%, W is less than or equal to 2.5%, co is less than or equal to 3.0%, B is less than or equal to 0.010%, and the balance is Fe and unavoidable substances.
2. A continuous casting method of a niobium-containing high-nitrogen nickel-based alloy is characterized by comprising the following steps: the process links are as follows: an alloy melting furnace or an electric furnace → an AOD furnace → LF ladle refining → continuous casting;
melting high-carbon ferrochrome, chrome-nickel pig iron and ferronickel in an alloy melting furnace or an electric furnace by equipment, adding the melted high-carbon ferrochrome, chrome-nickel pig iron and ferronickel into an AOD furnace, adding ferronickel, a nickel plate and high-carbon ferrochrome into the AOD furnace in the oxygen blowing and decarbonizing process for alloying, wherein the Cr yield is 94-96 percent, the Ni yield is 97-99 percent, adding ferrosilicon for reducing for 12-15min at the end of decarbonization at a ratio of 20-24kg/t, and tapping after the reduction is finished;
the AOD furnace steel tapping comprises the following components: c:0.05-0.08%, si:0.05-0.20%, mn is less than or equal to 1.50%, P is less than or equal to 0.020%, S is less than or equal to 0.010%, cr:23.0-27.0%, ni:35.0-39.0%, al is less than or equal to 0.40%, ti is less than or equal to 0.20%, nb is less than or equal to 0.10%, mo is less than or equal to 2.5%, cu is less than or equal to 0.5%, N:0.15-0.25%, W is less than or equal to 2.5%, co is less than or equal to 3.0%, B is less than or equal to 0.010%, and the balance of Fe and unavoidable substances;
carrying out slag skimming operation after tapping of the AOD furnace, and removing steel slag in a steel ladle, wherein the thickness of the steel slag is 100-150mm;
lifting the steel ladle to an LF furnace after slagging off, adding 1-2kg/t of aluminum pills into the LF furnace for deoxidation, adding ferroniobium for alloying, wherein the Nb yield is 95-99%, the argon gas supply intensity of steel ladle bottom blowing is 6-8Nl/min/t, the stirring time is 10-15min, the argon gas supply intensity of steel ladle bottom blowing is adjusted to 3-5Nl/min/t, the molten steel temperature is reduced, and when the molten steel temperature reaches 1440-1450 ℃, the treatment is finished;
the LF furnace comprises the following components after treatment is finished: c:0.05-0.08%, si:0.10-0.30%, mn is less than or equal to 1.50%, P is less than or equal to 0.020%, S is less than or equal to 0.002%, cr:23.0-27.0%, ni:35.0-39.0%, al is less than or equal to 0.40%, ti is less than or equal to 0.20%, nb:0.50-0.80%, mo is less than or equal to 2.5%, cu is less than or equal to 0.5%, N:0.15-0.25%, W is less than or equal to 2.5%, co is less than or equal to 3.0%, B is less than or equal to 0.010%, and the balance of Fe and unavoidable substances;
after the LF furnace is processed, hoisting a steel ladle to a wide vertical bending type slab continuous casting machine, wherein the width range of a casting blank is 1000-2150mm, when continuous casting is started, the pulling speed is set to be 0.15-0.25m/min, after the continuous casting is started for 0.5-1 min, the pulling speed is increased to be 0.35-0.45 m/min, after the continuous casting is started for 2-4min, the pulling speed is increased to be a target pulling speed, wherein the corresponding pulling speed range when the casting blank with the width of 1000-1500mm is cast is 0.65-0.75m/min, the target pulling speed is 0.7 m/min, and when the casting blank with the width of 1501-2150mm is cast, the corresponding pulling speed range is 0.55-0.65 m/min, the target pulling speed is 0.60 m/min, and the temperature of molten steel in a middle ladle is 1410-1420 ℃;
in the casting process, the cooling water flow of the crystallizer is 160-170 m 3 And/h, controlling the seedling emergence time to be 70-80s, reducing the cooling speed of the molten steel in the crystallizer, and improving the shell thickness in the casting stage, thereby improving the tensile stress capacity of the aluminum-and titanium-nickel-based alloy casting blank.
3. The method for continuously casting the niobium-containing high-nitrogen nickel-based alloy as claimed in claim 2, wherein: in the casting process, in order to prevent tensile stress cracks during casting blank straightening, a weak cooling mode is adopted before a secondary cooling water bending section, wherein the secondary cooling water quantity of a side guide roller Z1N area is 40 +/-2L/min, the secondary cooling water quantity of a foot roller Z1 IO area is 120 +/-2L/min, the secondary cooling water quantity of a bending section Z2 IOC area is 130 +/-2L/min, the secondary cooling water quantity of a bending section Z2 IOM area is 130 +/-2L/min, the secondary cooling water quantity of a bending section Z3 IOC area is 120 +/-2L/min, the secondary cooling water quantity of a bending section Z3 IOM area is 120 +/-2L/min, the secondary cooling water quantity of a bending section Z4 IOC area is 100 +/-2 zxft 3238/min, and the secondary cooling water quantity of a bending section Z4 IOM area is 100 +/-2 zxft 3262/min.
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