CN115505820B - 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 53
- 238000009749 continuous casting Methods 0.000 title claims abstract description 38
- 239000010955 niobium Substances 0.000 title claims abstract description 30
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 29
- 239000000956 alloy Substances 0.000 title claims abstract description 29
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 29
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 28
- 229910052758 niobium Inorganic materials 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 19
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 title claims abstract description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000005266 casting Methods 0.000 claims abstract description 49
- 238000005452 bending Methods 0.000 claims abstract description 32
- 238000002844 melting Methods 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 7
- 238000007670 refining Methods 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 65
- 239000010959 steel Substances 0.000 claims description 65
- 239000000498 cooling water Substances 0.000 claims description 26
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 25
- 239000002893 slag Substances 0.000 claims description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 238000007664 blowing Methods 0.000 claims description 17
- 229910052698 phosphorus Inorganic materials 0.000 claims description 17
- 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
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- 229910000863 Ferronickel Inorganic materials 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 15
- 229910052721 tungsten Inorganic materials 0.000 claims description 15
- 238000005275 alloying Methods 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 238000005261 decarburization Methods 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 9
- 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
- 229910000805 Pig iron Inorganic materials 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 239000008188 pellet Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 claims 1
- 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
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 description 10
- 229910052804 chromium Inorganic materials 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 229910052748 manganese Inorganic materials 0.000 description 9
- 229910052750 molybdenum Inorganic materials 0.000 description 9
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 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
- 229920005591 polysilicon Polymers 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
-
- 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
-
- 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
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- 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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- 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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- 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
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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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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Abstract
The invention belongs to the field of steelmaking, and relates to a continuous casting method of a niobium-containing high-nitrogen nickel-based alloy, which comprises the following process links: alloy melting furnace or electric furnace, AOD furnace, LF ladle refining and continuous casting; the invention uses the wide vertical bending type slab caster for casting, thereby greatly improving the product yield and production efficiency, stabilizing the product quality, reducing the production cost and realizing 92-96% of continuous casting metal yield.
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, in particular to the niobium-containing high-nitrogen-type alloy which contains higher niobium, nitrogen and other alloy elements, 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 polysilicon cold hydrogenation high-parameter reactors and the like.
The niobium-containing high-nitrogen nickel-base alloy is generally smelted by a vacuum induction furnace and remelted by a vacuum consumable furnace or an electroslag furnace, and hot working adopts casting and rolling processes, so that the product quality is unstable, the production cost is high, the product yield and the production efficiency are low, and the contradiction between supply and demand is outstanding, which severely restricts the wide use and industrial production of the product.
Therefore, there is a great concern about a method for producing a niobium-containing high-nitrogen nickel-based alloy by smelting in a large stainless steel refining furnace and casting in a wide vertical-bending slab caster.
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 quality of the products, reduces the production cost and realizes the efficient and stable production of a wide vertical bending slab caster.
Disclosure of Invention
The invention aims to solve the problems and provides a continuous casting method of a niobium-containing high-nitrogen nickel-based alloy.
The purpose of the invention is realized in the following way: 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%, si less than or equal to 0.30%, mn less than or equal to 1.50%, P less than or equal to 0.020%, S less than or equal to 0.002%, cr:23.0-27.0%, ni:35.0-39.0%, al less than or equal to 0.40%, ti 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 a niobium-containing high-nitrogen nickel-based alloy comprises the following process links: alloy melting furnace or electric furnace, AOD furnace, LF ladle refining and continuous casting; melting high-carbon ferrochrome, ferrochrome pig iron and ferronickel by an alloy melting furnace or an electric furnace, adding into an AOD furnace, adding ferronickel, a nickel plate and high-carbon ferrochrome for alloying in the oxygen blowing decarburization process of the AOD furnace, wherein the Cr yield is 94-96%, the Ni yield is 97-99%, adding ferrosilicon for 20-24kg/t for reduction for 12-15min after decarburization is finished, and tapping after reduction is finished; the components after tapping of the AOD furnace are as follows:c:0.05-0.08%, si:0.05-0.20%, mn less than or equal to 1.50%, P less than or equal to 0.020%, S less than or equal to 0.010%, cr:23.0-27.0%, ni:35.0-39.0%, al less than or equal to 0.40%, ti less than or equal to 0.20%, nb less than or equal to 0.10%, mo less than or equal to 2.5%, cu 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 is Fe and unavoidable substances; after tapping, carrying out slag skimming operation on the steel in the steel ladle, and removing the steel slag in the steel ladle, wherein the thickness of the steel ladle slag is 100-150mm; lifting the steel ladle to an LF furnace after slag skimming, adding 1-2kg/t of aluminum pellets into the LF furnace for deoxidization, adding ferrocolumbium for alloying, wherein the Nb yield is 95-99%, the gas supply intensity of bottom-blowing argon of the steel ladle is 6-8Nl/min/t, the stirring time is 10-15min, the gas supply intensity of bottom-blowing argon of the steel ladle is adjusted to 3-5Nl/min/t, the temperature of molten steel is reduced, and when the temperature of molten steel reaches 1440-1450 ℃, the treatment is finished; after the LF furnace treatment is finished, the components are as follows: c:0.05-0.08%, si:0.10-0.30%, mn less than or equal to 1.50%, P less than or equal to 0.020%, S less than or equal to 0.002%, cr:23.0-27.0%, ni:35.0-39.0%, al less than or equal to 0.40%, ti 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 is Fe and unavoidable substances; after the LF furnace treatment is finished, hoisting the steel ladle to a casting blank width range of 1000-2150mm of a wide vertical bending type slab caster, setting a pulling speed to be 0.15-0.25m/min when casting is started, after casting is started for 0.5-1 min, increasing the pulling speed to be 0.35-0.45 m/min, and after casting is started for 2-4min, increasing the pulling speed to a target pulling speed, wherein the pulling speed range corresponding to casting blanks with the casting width of 1000-1500mm is 0.65-0.75m/min, the target pulling speed is 0.7m/min, the pulling speed range corresponding to casting blanks with the casting width of 1501-2150mm is 0.55-0.65 m/min, the target pulling speed is 0.60 m/min, and the molten steel temperature of the tundish is 1410-1420 ℃; in the casting process, the cooling water flow of the crystallizer is 160-170 and 170 m 3 And/h, controlling the emergence time to be 70-80s, reducing the cooling speed of molten steel in a crystallizer, improving the thickness of a shell in a casting stage, and further improving the tensile stress capacity of the aluminum-titanium-nickel-base alloy casting blank.
In the casting process, in order to prevent the tensile stress crack from occurring during casting blank straightening, a weak cooling mode is adopted before a secondary cooling bending section, wherein the secondary cooling water volume of a side guide roller Z1N region is 40+/-2L/min, the secondary cooling water volume of a foot roller Z1 IO region is 120+/-2L/min, the secondary cooling water volume of a bending section Z2 IOC region is 130+/-2L/min, the secondary cooling water volume of a bending section Z2 IOM region is 130+/-2L/min, the secondary cooling water volume of a bending section Z3 IOC region is 120+/-2L/min, the secondary cooling water volume of a bending section Z3 IOM region is 120+/-2L/min, the secondary cooling water volume of a bending section Z4 IOC region is 100+/-2L/min, and the secondary cooling water volume of a bending section Z4 IOM region is 100+/-2L/min.
The beneficial effects of the invention are as follows: the invention uses the wide vertical bending type slab caster for casting, thereby greatly improving the product yield and production efficiency, stabilizing the product quality, reducing the production cost and realizing 92-96% of continuous casting metal yield.
Detailed Description
The national standard component requirements of the N08120 of the invention are:
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 unavoidable 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: alloy melting furnace or electric furnace, AOD furnace, LF ladle refining and continuous casting.
High-carbon ferrochrome, ferrochrome pig iron and ferronickel are melted by an alloy melting furnace or an electric furnace and the like, then are added into an AOD furnace, ferronickel, nickel plates and high-carbon ferrochrome are added in the oxygen blowing decarburization process of the AOD furnace for alloying (the Cr yield is 94-96%, the Ni yield is 97-99%), ferrosilicon (20-24 kg/t) is added after decarburization is finished, and then the steel is tapped after the reduction is finished.
The components after tapping of the AOD furnace are as follows:
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 unavoidable substances.
After tapping, carrying out slag skimming operation to remove steel slag in the steel ladle, wherein the thickness of the steel ladle slag is 100-150mm.
Lifting the steel ladle to an LF furnace after slag skimming, adding 1-2kg/t of aluminum pellets into the LF furnace for deoxidization, adding ferroniobium for alloying (Nb yield is 95-99%), carrying out stirring for 10-15min, adjusting the intensity of argon gas supply for bottom blowing of the steel ladle to 3-5Nl/min/t, reducing the temperature of molten steel, and ending the treatment when the temperature of molten steel reaches 1440-1450 ℃.
After the LF furnace treatment is finished, the components are as follows:
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 unavoidable substances.
After the LF furnace treatment is finished, the ladle is lifted to a wide vertical bending slab continuous casting machine (the width range of 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 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 the target pulling speed, wherein the pulling speed range corresponding to casting of a casting blank 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 of a casting blank 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 ladle molten steel is 1410-1420 ℃.
In the casting process, the cooling water flow of the crystallizer is 160-170 and 170 m 3 And/h, controlling the emergence time to be 70-80s, reducing the cooling speed of molten steel in a crystallizer, improving the thickness of a shell in a casting stage, and further improving the tensile stress capacity of the aluminum-titanium-nickel-base alloy casting blank.
In order to prevent tensile stress cracks during casting blank straightening, a weak cooling mode is adopted before a secondary cooling water bending section, and the given water quantity before the bending section is as follows:
after casting, the yield of the continuous casting metal is 92-96%.
Example 1
And (3) smelting high-carbon ferrochrome, ferrochrome pig iron and ferronickel in a steel plant through an alloy smelting furnace, adding the molten ferrochrome, the molten ferrochrome and the ferronickel into an AOD furnace, adding the ferronickel, a nickel plate and the high-carbon ferrochrome for alloying in an oxygen blowing decarburization process of the AOD furnace, adding 22.1kg/t ferrosilicon after decarburization, reducing for 13min, wherein the Cr yield is 95.1%, the Ni yield is 98.6%, and tapping after reduction is finished.
The components after tapping of the AOD furnace are as follows:
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 unavoidable substances.
After tapping, carrying out slag skimming operation to remove steel slag in the steel ladle, wherein the steel ladle slag is thick: 135mm.
Lifting the steel ladle to an LF furnace after slag skimming, adding 1.5kg/t aluminum pellets into the LF furnace for deoxidization, adding ferroniobium for alloying (Nb yield 98%), wherein the gas supply intensity of argon bottom blowing of the steel ladle is 7Nl/min/t, stirring time is 12min, the gas supply intensity of argon bottom blowing of the steel ladle is adjusted to 4Nl/min/t, the temperature of molten steel is reduced, and when the temperature of molten steel reaches 1443 ℃, the treatment is finished.
After the LF furnace treatment is finished, the components are as follows:
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 unavoidable substances.
After the LF furnace treatment is finished, the ladle is lifted to a wide vertical bending slab continuous casting machine (the width of a casting blank is 2050 mm). When continuous casting is started, the pulling speed is set to be 0.21m/min, after 50s of continuous casting is started, the pulling speed is increased to be 0.40m/min, after 3min of continuous casting is started, the pulling speed is increased to be 0.61 m/min. Tundish molten steel temperature 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 should be adopted before the secondary cooling water bending section, and the given water quantity before the bending section is as follows:
after casting, the yield of the continuous casting metal is 94.1%.
Example 2
And (3) smelting high-carbon ferrochrome, ferrochrome pig iron and ferronickel in a steel plant through an alloy smelting furnace, adding the molten ferrochrome, the molten ferrochrome and the ferronickel into an AOD furnace, adding the ferronickel, a nickel plate and the high-carbon ferrochrome for alloying in an oxygen blowing decarburization process of the AOD furnace, adding 23.5kg/t of ferrosilicon after decarburization, reducing for 15min, wherein the Cr yield is 95.5%, the Ni yield is 98.4%, and tapping after reduction is finished.
The components after tapping of the AOD furnace are as follows:
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 unavoidable substances.
After tapping, carrying out slag skimming operation to remove steel slag in the steel ladle, wherein the steel ladle slag is thick: 130mm.
Lifting the ladle to an LF furnace after slag skimming, adding 1.6kg/t aluminum pellets into the LF furnace for deoxidization, adding ferroniobium for alloying (Nb yield is 97%), wherein the gas supply intensity of argon bottom blowing of the ladle is 8Nl/min/t, stirring time is 13min, the gas supply intensity of argon bottom blowing of the ladle is adjusted to 5Nl/min/t, the temperature of molten steel is reduced, and when the temperature of molten steel reaches 1445 ℃, the treatment is finished.
After the LF furnace treatment is finished, the components are as follows:
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 unavoidable substances.
After the LF furnace treatment is finished, the steel ladle is lifted to a wide vertical bending slab continuous casting machine (the width of a casting blank is 1550 mm). When continuous casting is started, the pulling speed is set to be 0.20m/min, after 45s of continuous casting is started, the pulling speed is increased to be 0.41m/min, after 3min of continuous casting is started, the pulling speed is increased to be 0.70 m/min. Tundish molten steel temperature 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 should be adopted before the secondary cooling water bending section, and the given water quantity before the bending section is as follows:
after casting, the yield of the continuous casting metal is 92.5%.
Example 3
And (3) smelting high-carbon ferrochrome, ferrochrome pig iron and ferronickel in a steel plant through an alloy smelting furnace, adding the molten ferrochrome, the molten ferrochrome and the ferronickel into an AOD furnace, adding the ferronickel, a nickel plate and the high-carbon ferrochrome for alloying in an oxygen blowing decarburization process of the AOD furnace, adding 23.2kg/t of ferrosilicon after decarburization, reducing for 14min, wherein the Cr yield is 94.9%, the Ni yield is 97.8%, and tapping after reduction is finished.
The components after tapping of the AOD furnace are as follows:
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 unavoidable substances.
After tapping, carrying out slag skimming operation to remove steel slag in the steel ladle, wherein the steel ladle slag is thick: 125mm.
Lifting the steel ladle to an LF furnace after slag skimming, adding 1.3kg/t aluminum pellets into the LF furnace for deoxidization, adding ferroniobium for alloying (Nb yield 98%), wherein the gas supply intensity of argon bottom blowing of the steel ladle is 7Nl/min/t, stirring time is 11min, the gas supply intensity of argon bottom blowing of the steel ladle is adjusted to 4Nl/min/t, the temperature of molten steel is reduced, and when the temperature of molten steel reaches 1444 ℃, the treatment is finished.
After the LF furnace treatment is finished, the components are as follows:
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 unavoidable substances.
After the LF furnace treatment is finished, the steel ladle is lifted to a wide vertical bending slab continuous casting machine (the width of a casting blank is 1550 mm). When continuous casting is started, the pulling speed is set to be 0.22m/min, after the continuous casting is started for 51s, the pulling speed is increased to be 0.40m/min, after the continuous casting is started for 3min and 10s, the pulling speed is increased to be 0.69 m/min. 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 should be adopted before the secondary cooling water bending section, and the given water quantity before the bending section is as follows:
after casting, the yield of the continuous casting metal is 94.0%.
The above embodiments are merely examples of the present invention, but the present invention is not limited to the above embodiments, and any changes or modifications within the scope of the present invention are intended to be included in the scope of the present invention.
Claims (1)
1. A continuous casting method of a niobium-containing high-nitrogen nickel-based alloy is characterized in that: the niobium-containing high-nitrogen nickel-based alloy comprises the following chemical components in percentage by weight: c:0.02-0.10%, si less than or equal to 0.30%, mn less than or equal to 1.50%, P less than or equal to 0.020%, S less than or equal to 0.002%, cr:23.0-27.0%, ni:35.0-39.0%, al less than or equal to 0.40%, ti 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;
the continuous casting process of the niobium-containing high-nitrogen nickel-based alloy includes the following steps: alloy melting furnace or electric furnace, AOD furnace, LF ladle refining and continuous casting;
smelting high-carbon ferrochrome, ferrochrome pig iron and ferronickel by an alloy smelting furnace or electric furnace equipment, adding the molten ferrochrome into an AOD furnace, adding the ferronickel, a nickel plate and the high-carbon ferrochrome for alloying in the oxygen blowing decarburization process of the AOD furnace, wherein the Cr yield is 94-96%, the Ni yield is 97-99%, adding 20-24kg/t of ferrosilicon for reduction for 12-15min after decarburization is finished, and tapping after reduction is finished;
the components after tapping of the AOD furnace are as follows: c:0.05-0.08%, si:0.05-0.20%, mn less than or equal to 1.50%, P less than or equal to 0.020%, S less than or equal to 0.010%, cr:23.0-27.0%, ni:35.0-39.0%, al less than or equal to 0.40%, ti less than or equal to 0.20%, nb less than or equal to 0.10%, mo less than or equal to 2.5%, cu 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 is Fe and unavoidable substances;
after tapping, carrying out slag skimming operation on the steel in the steel ladle, and removing the steel slag in the steel ladle, wherein the thickness of the steel ladle slag is 100-150mm;
lifting the steel ladle to an LF furnace after slag skimming, adding 1-2kg/t of aluminum pellets into the LF furnace for deoxidization, adding ferrocolumbium for alloying, wherein the Nb yield is 95-99%, the gas supply intensity of bottom-blowing argon of the steel ladle is 6-8Nl/min/t, the stirring time is 10-15min, the gas supply intensity of bottom-blowing argon of the steel ladle is adjusted to 3-5Nl/min/t, the temperature of molten steel is reduced, and when the temperature of molten steel reaches 1440-1450 ℃, the treatment is finished;
after the LF furnace treatment is finished, the components are as follows: c:0.05-0.08%, si:0.10-0.30%, mn less than or equal to 1.50%, P less than or equal to 0.020%, S less than or equal to 0.002%, cr:23.0-27.0%, ni:35.0-39.0%, al less than or equal to 0.40%, ti 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 is Fe and unavoidable substances;
after LF furnace treatment is finished, hoisting the steel ladle to a wide vertical bending slab continuous casting machine, setting the pulling speed to be 0.15-0.25m/min when casting the casting blank of the continuous casting machine with the width of 1000-2150mm, after casting for 0.5-1 min, increasing the pulling speed to be 0.35-0.45 m/min, after casting for 2-4min, increasing the pulling speed to be a target pulling speed, wherein the pulling speed range corresponding to casting the casting blank with the width of 1000-1500mm is 0.65-0.75m/min, the pulling speed range corresponding to casting the casting blank with the width of 1501-2150mm is 0.55-0.65 m/min, the target pulling speed is 0.60 m/min, and the molten steel temperature of the tundish is 1410-1420 ℃;
in the casting process, the cooling water flow of the crystallizer is 160-170 and 170 m 3 And/h, controlling the emergence time to be 70-80s, reducing the cooling speed of molten steel in a crystallizer, improving the thickness of a shell in a casting stage, and further improving the tensile stress capacity of a casting blank containing aluminum and titanium-nickel base alloy;
in the casting process, in order to prevent the tensile stress crack from occurring during casting blank straightening, a weak cooling mode is adopted before a secondary cooling bending section, wherein the secondary cooling water volume of a side guide roller Z1N region is 40+/-2L/min, the secondary cooling water volume of a foot roller Z1 IO region is 120+/-2L/min, the secondary cooling water volume of a bending section Z2 IOC region is 130+/-2L/min, the secondary cooling water volume of a bending section Z2 IOM region is 130+/-2L/min, the secondary cooling water volume of a bending section Z3 IOC region is 120+/-2L/min, the secondary cooling water volume of a bending section Z3 IOM region is 120+/-2L/min, the secondary cooling water volume of a bending section Z4 IOC region is 100+/-2L/min, and the secondary cooling water volume of a bending section Z4 IOM region is 100+/-2L/min.
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