CN117430413B - Stopper rod for continuous casting and preparation method thereof - Google Patents
Stopper rod for continuous casting and preparation method thereof Download PDFInfo
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- CN117430413B CN117430413B CN202311755311.4A CN202311755311A CN117430413B CN 117430413 B CN117430413 B CN 117430413B CN 202311755311 A CN202311755311 A CN 202311755311A CN 117430413 B CN117430413 B CN 117430413B
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title abstract description 36
- 239000002893 slag Substances 0.000 claims abstract description 73
- 239000002994 raw material Substances 0.000 claims abstract description 52
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 claims abstract description 43
- -1 aluminum-magnesium-carbon Chemical compound 0.000 claims abstract description 27
- 239000002245 particle Substances 0.000 claims description 129
- 239000000843 powder Substances 0.000 claims description 85
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 59
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 43
- 239000000395 magnesium oxide Substances 0.000 claims description 30
- 150000004767 nitrides Chemical class 0.000 claims description 29
- 239000002131 composite material Substances 0.000 claims description 28
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 26
- 229910052749 magnesium Inorganic materials 0.000 claims description 26
- 239000011777 magnesium Substances 0.000 claims description 26
- 229910002804 graphite Inorganic materials 0.000 claims description 24
- 239000010439 graphite Substances 0.000 claims description 24
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 20
- 239000005011 phenolic resin Substances 0.000 claims description 20
- 229920001568 phenolic resin Polymers 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 17
- 239000002904 solvent Substances 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 16
- 229910052596 spinel Inorganic materials 0.000 claims description 16
- 239000011029 spinel Substances 0.000 claims description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- 230000003068 static effect Effects 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 12
- 238000005469 granulation Methods 0.000 claims description 11
- 230000003179 granulation Effects 0.000 claims description 11
- 239000003963 antioxidant agent Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- 238000011049 filling Methods 0.000 claims description 9
- 239000008187 granular material Substances 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 9
- 230000003078 antioxidant effect Effects 0.000 claims description 8
- 229910052582 BN Inorganic materials 0.000 claims description 3
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 3
- UAMZXLIURMNTHD-UHFFFAOYSA-N dialuminum;magnesium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[Mg+2].[Al+3].[Al+3] UAMZXLIURMNTHD-UHFFFAOYSA-N 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- 229910052566 spinel group Inorganic materials 0.000 claims 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 40
- 239000010959 steel Substances 0.000 abstract description 40
- 230000003628 erosive effect Effects 0.000 abstract description 18
- 230000035939 shock Effects 0.000 abstract description 7
- 238000005336 cracking Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 12
- 239000011819 refractory material Substances 0.000 description 11
- 238000009472 formulation Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- 238000009826 distribution Methods 0.000 description 7
- 238000010304 firing Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910000975 Carbon steel Inorganic materials 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 5
- 239000010962 carbon steel Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000007873 sieving Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 239000003575 carbonaceous material Substances 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 239000010431 corundum Substances 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 238000004901 spalling Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- QJQZRLXDLORINA-UHFFFAOYSA-N 2-cyclohexylethanol Chemical group OCCC1CCCCC1 QJQZRLXDLORINA-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- HPXRVTGHNJAIIH-UHFFFAOYSA-N cyclohexanol Chemical compound OC1CCCCC1 HPXRVTGHNJAIIH-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/44—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminates
- C04B35/443—Magnesium aluminate spinel
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/16—Closures stopper-rod type, i.e. a stopper-rod being positioned downwardly through the vessel and the metal therein, for selective registry with the pouring opening
- B22D41/18—Stopper-rods therefor
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
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- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/3873—Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
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- C04B2235/40—Metallic constituents or additives not added as binding phase
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
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- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
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- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
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- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The application discloses a stopper rod for continuous casting and a preparation method thereof. In one aspect, the present application provides a stopper for continuous casting, including a stopper body, and a stopper head and a stopper slag line that are composited on the stopper body; the stopper rod body is made of aluminum-magnesium-carbon or magnesium-carbon, the stopper rod head is made of aluminum-magnesium-carbon or magnesium-carbon, and the stopper rod slag line is made of magnesium-carbon; the stopper rod body and the stopper rod head are prepared by adopting specific raw material proportions. On the other hand, the application also provides a preparation method of the stopper rod for continuous casting. The continuous casting stopper rod has the advantages of more excellent thermal shock resistance and anti-stripping performance, stronger molten steel and slag erosion resistance, longer service life and difficult occurrence of chipping and cracking during use.
Description
Technical Field
The application relates to the technical field of refractory materials, in particular to a stopper rod for continuous casting and a preparation method thereof.
Background
The refractory material for continuous casting function is a special refractory material developed along with the development of continuous casting technology in the iron and steel smelting industry. The long nozzle, the stopper rod and the submerged nozzle are three parts for continuous casting function known in the prior art, and all adopt refractory materials for continuous casting function, which are also important preconditions for ensuring the normal operation of the continuous casting process. The current continuous casting process is generally that molten steel flows from a ladle into a tundish and then flows into a mold through a nozzle of the tundish.
At present, about 80% of steel billets in the world are produced by adopting a continuous casting technology, and the performances of a long nozzle, a stopper rod and a submerged nozzle are good or bad, so that the continuous casting efficiency and the quality of the steel billets are directly influenced. With the popularization of the high-speed and high-efficiency continuous casting technology and the development of the clean steel smelting technology, the requirements on the performance, the functionality and the service life of the continuous casting functional refractory are more and more strict.
The stopper rod for continuous casting is mainly used for opening and closing a tundish, the position of the head of the stopper rod to a water gap of the tundish is controlled to regulate the flow of molten steel entering a crystallizer, and argon can be blown into the immersed water gap of the tundish through a central hole of the integral stopper rod so as to prevent the water gap from being blocked. Unlike long nozzle, the stopper rod for continuous casting needs to be placed in the intermediate tank for a long time, is soaked by molten steel for a long time, and is more easy to age and damage. At present, the existing stopper rod for continuous casting generally adopts aluminum-carbon materials for the main body part; in order to adapt to different steel casting and prolong the service life of the stopper rod, the existing stopper rod mostly adopts a composite structure, adopts refractory materials with better molten steel erosion resistance to prepare a slag line and a stopper rod head, and then is composited with a stopper rod main body. At present, zrO-containing slag line and stopper head of composite stopper are mostly adopted 2 、ZrO 2 Refractory materials of C and MgO-C etc. to improve the erosion resistance of the stopper rod.
The existing aluminum-carbon integral stopper rod has unsatisfactory erosion resistance to molten steel and slag and molten steel scouring resistance, and is easy to soften, deform and fracture after being soaked in molten steel for a long time when in use. The existing composite stopper rod has insufficient spalling resistance and thermal shock resistance of slag line and stopper rod head, and is easy to fall off and crack when in use. The problems cause that the service life of the conventional continuous casting stopper rod is generally 8-20 hours, and the requirement of a high-speed and high-efficiency continuous casting process is difficult to meet. In addition, the problems of falling and peeling of the existing continuous casting stopper rod can lead to the fact that scraps peeled off by the stopper rod enter molten steel, so that the quality of the molten steel is seriously affected, and the requirements of the existing clean steel smelting process are difficult to meet.
Disclosure of Invention
In order to solve at least one technical problem, a composite stopper rod for continuous casting, which has more excellent thermal shock resistance and spalling resistance, stronger molten steel and slag erosion resistance and longer service life and is not easy to cause chipping and cracking during use, is developed.
In one aspect, the application provides a stopper for continuous casting, comprising a stopper body, a stopper head and a stopper slag line which are compounded on the stopper body,
the stopper rod body is made of aluminum-magnesium-carbon or magnesium-carbon, the stopper rod head is made of aluminum-magnesium-carbon or magnesium-carbon, and the stopper rod slag line is made of magnesium-carbon;
the aluminum-magnesium-carbon stopper rod comprises the following raw materials in parts by weight: 55-60 parts of electrofused aluminum magnesium spinel, 6-8 parts of active alpha alumina powder, 18-22 parts of crystalline flake graphite, 6-8 parts of solid phenolic resin powder, 0.2-0.5 part of inorganic nitride powder, 2-3 parts of siliceous composite antioxidant and 6-8 parts of solvent;
the magnesium-carbon stopper rod body comprises the following raw materials in parts by weight: 54-60 parts of fused magnesia, 6-10 parts of active alpha alumina powder, 18-22 parts of crystalline flake graphite, 6-8 parts of solid phenolic resin powder, 0.1-0.6 part of inorganic nitride powder, 2-3 parts of magnesium shield and 6-8 parts of solvent;
the aluminum-magnesium-carbon stopper rod head comprises the following raw materials in parts by weight: 70-80 parts of electrofused aluminum magnesium spinel, 3-6 parts of active alpha alumina powder, 6-10 parts of crystalline flake graphite, 5-8 parts of solid phenolic resin powder, 0.3-0.8 part of inorganic nitride powder and 5-8 parts of solvent;
the magnesium-carbon stopper rod head comprises the following raw materials in parts by weight: 75-80 parts of fused magnesia, 8-12 parts of crystalline flake graphite, 6-7 parts of solid phenolic resin powder, 0.2-0.5 part of inorganic nitride powder, 1.4-1.8 parts of magnesium shield and 5-6 parts of solvent.
Optionally, the stopper rod body is made of aluminum, magnesium and carbon, the stopper rod head is made of magnesium and carbon, and the stopper rod slag line is made of magnesium and carbon; or the stopper rod body is made of magnesia carbon, the stopper rod head is made of alumina magnesia carbon, and the stopper rod slag line is made of magnesia carbon.
Further optionally, the magnesium-carbon stopper rod slag line comprises the following raw materials in parts by weight: 62-65 parts of fused magnesia, 20-24 parts of crystalline flake graphite, 6-8 parts of solid phenolic resin powder, 0.2-0.5 part of inorganic nitride powder, 1-2 parts of magnesium shield and 6-7 parts of solvent.
By adopting the technical scheme, the aluminum-magnesium-carbon or magnesium-carbon stopper rod body is adopted, the stopper rod head is made of aluminum-magnesium-carbon or magnesium-carbon, the stopper rod slag line is made of magnesium-carbon, the thermal deformation rates of the prepared composite stopper rod body, the prepared composite stopper rod head and the prepared composite stopper slag line are very close, the composite stopper rod can be effectively ensured to be peeled and cracked due to different thermal deformation rates of all parts under long-time high temperature, and the problems that chips enter molten steel and the quality of molten steel are influenced due to falling sheets and surface falling can be effectively avoided; the aluminum-magnesium-carbon or magnesium-carbon rod head and the magnesium-carbon slag line are adopted, the fired refractory piece has extremely excellent thermal shock resistance and erosion resistance, excellent high temperature resistance, long service life and can effectively resist molten steel scouring and erosion; according to the stopper rod body, the stopper rod head and the slag line, the inorganic nitride powder is used as an antioxidant, so that not only can the oxidation resistance of a product be improved, but also the bonding strength of pug can be effectively improved as a bonding agent, the static pressure forming pressure is reduced, the demolding performance of the pug is improved, the pug can be formed under lower static pressure, the strength of a pug blank is good, the quality of a fired refractory piece can be effectively improved, and the preparation efficiency is improved; the aluminum-magnesium-carbon or magnesium-carbon body, the aluminum-magnesium-carbon or magnesium-carbon rod head and the magnesium-carbon slag line which are prepared by adopting specific raw material proportions are adopted, the external strength of the stopper rod obtained by firing is higher, the body part also has higher strength, the bonding strength of each part is higher, the size can be kept intact under the erosion of long-time high-temperature molten steel, and the functional loss caused by the size change can be effectively avoided.
Optionally, the magnesium shield adopts magnesium shield powder with the grain size within 1 mm.
Optionally, the particle size of the active alpha alumina powder and the inorganic nitride powder is controlled to be more than 325 meshes.
Optionally, the inorganic nitride powder is selected from at least two of silicon nitride, boron nitride and aluminum nitride.
Optionally, the grain size of the fused aluminum magnesium spinel is controlled to be 50-500 μm, fused aluminum magnesium spinel with two grain sizes is adopted, and the grain size difference of the fused aluminum magnesium spinel with two grain sizes is controlled to be more than 200 μm.
Optionally, the grain size of the fused magnesia is controlled to be 50-500 μm, two kinds of fused magnesia with the grain sizes are adopted, and the grain size difference of the two kinds of fused magnesia with the grain sizes is controlled to be more than 200 μm.
Alternatively, the solvent is cyclohexylethanol.
Through adopting above-mentioned technical scheme, the granularity and the ratio of this application strict control main raw materials back, the antistripping performance and the life of stopper stick that make can obtain further promotion.
On the other hand, the application also provides a preparation method of the continuous casting stopper rod, which comprises the following steps:
s1, respectively adding raw materials of a stopper body, a stopper head and a stopper slag line with the formula amount into a mixing granulator for granulation to prepare granules with granularity within 1mm, and then drying until the volatile content is within 5%, so as to respectively obtain mud granules of the stopper body, the stopper head and the stopper slag line;
s2, filling mud particles of the stopper rod body, the stopper rod head and the stopper rod slag line obtained in the step S1 into a die, and carrying out static pressure pressing for 30-60S under the pressure of 32-36 mpa to obtain a stopper rod mud blank;
s3, drying the stopper rod mud blank prepared in the step S2 for more than 7 hours at the temperature of 180-240 ℃ to prepare a stopper rod rough blank;
and S4, sintering the crude stopper rod blank obtained in the step S3 at a high temperature of 920-980 ℃ to obtain a stopper rod finished product.
Optionally, in the step S1, the drying process needs to control the volatile matters of the pug particles of the stopper body, the stopper head and the stopper slag line to be 2.2-2.8%.
Optionally, in the step S1, the particle size distribution of the pug particles of the aluminum-magnesium-carbon stopper rod head needs to be controlled to be: particles with the particle size of more than 1mm account for 5-10%, particles with the particle size of 0.5-1 mm account for 40-50%, particles with the particle size of 0.2-0.5 mm account for 20-25%, particles with the particle size of 0.1-0.2 mm account for 10-15%, particles with the particle size of 0.074-0.1 mm account for 10-15%, and particles with the particle size of less than 0.074mm account for 0-5%; the particle size distribution of mud particles of the magnesium-carbon stopper rod head needs to be controlled as follows: the particle with the particle size of more than 1mm accounts for 5-10%, the particle with the particle size of 0.5-1 mm accounts for 40-50%, the particle with the particle size of 0.2-0.5 mm accounts for 20-25%, the particle with the particle size of 0.1-0.2 mm accounts for 10-15%, the particle with the particle size of 0.074-0.1 mm accounts for 10-15%, and the particle with the particle size of less than 0.074mm accounts for 0-5%.
Optionally, in the step S1, the particle size distribution of the pug particles of the magnesium-carbon stopper rod slag line needs to be controlled to be: the particle with the particle size of more than 1mm accounts for 5-10%, the particle with the particle size of 0.5-1 mm accounts for 35-45%, the particle with the particle size of 0.2-0.5 mm accounts for 20-25%, the particle with the particle size of 0.1-0.2 mm accounts for 15-20%, the particle with the particle size of 0.074-0.1 mm accounts for 10-15%, and the particle with the particle size of less than 0.074mm accounts for 0-5%.
In summary, the present invention includes at least one of the following beneficial technical effects:
1. according to the method, the aluminum-magnesium-carbon or magnesium-carbon stopper rod body is adopted, the aluminum-magnesium-carbon or magnesium-carbon stopper rod head is adopted as the stopper rod slag line, the prepared composite stopper rod body, the prepared composite stopper rod head and the prepared composite stopper rod slag line are quite close in thermal deformation rate, peeling and cracking caused by different thermal deformation of each part of the composite stopper rod can be effectively guaranteed at a long time high temperature, chipping entering molten steel due to falling of chips and surface falling can be effectively avoided, and the quality of molten steel is influenced.
2. The aluminum-magnesium-carbon or magnesium-carbon rod head and the magnesium-carbon slag line are adopted, the fired refractory piece has extremely excellent thermal shock resistance and erosion resistance, excellent high temperature resistance, long service life and can effectively resist molten steel scouring and erosion.
3. According to the stopper rod body, the stopper rod head and the slag line, the inorganic nitride powder is used as an antioxidant, not only can the oxidation resistance of a product be improved, but also the bonding strength of pug can be effectively improved as a bonding agent, the static pressure forming pressure is reduced, the demolding performance of the pug is improved, the pug can be formed under lower static pressure, the strength of a pug blank is good, the quality of a fired refractory piece can be effectively improved, and the preparation efficiency is improved.
4. The aluminum-magnesium-carbon or magnesium-carbon body, the aluminum-magnesium-carbon or magnesium-carbon rod head and the magnesium-carbon slag line which are prepared by adopting specific raw material proportions are adopted, the external strength of the stopper rod obtained by firing is higher, the body part also has higher strength, the bonding strength of each part is higher, the size can be kept intact under the erosion of long-time high-temperature molten steel, and the functional loss caused by the size change can be effectively avoided.
5. According to the preparation method, the pug is granulated by a mixing granulator, and is pressed into a pug blank by using static pressure of about 35Mpa after being die-filled, and is preformed by low-temperature firing and then is prepared by a high-temperature sintering forming mode, so that the preparation process is extremely convenient; in addition, the preparation method of the application is easy in mud material die filling and demolding, the time from mud material die filling to product demolding can be controlled within 7 minutes, the molding efficiency is further improved, and the equipment abrasion is further reduced.
Detailed Description
The present application is described in further detail below with reference to examples.
The utility model provides a continuous casting is with stopper, including stopper body to and compound stopper head and stopper slag line on the stopper body, with the structure of current continuous casting with stopper basically unanimous. The stopper rod body is made of aluminum-magnesium-carbon or magnesium-carbon, the stopper rod head is made of aluminum-magnesium-carbon or magnesium-carbon, and the stopper rod slag line is made of magnesium-carbon.
Preferably, the stopper rod body is made of aluminum, magnesium and carbon, the stopper rod head is made of magnesium and carbon, and the stopper rod slag line is made of magnesium and carbon; or the stopper rod body is made of magnesia carbon, the stopper rod head is made of alumina magnesia carbon, and the stopper rod slag line is made of magnesia carbon.
Specifically, the aluminum-magnesium-carbon stopper rod body comprises the following raw materials in parts by weight: 55-60 parts of electrofused aluminum magnesium spinel, 6-8 parts of active alpha alumina powder, 18-22 parts of crystalline flake graphite, 6-8 parts of solid phenolic resin powder, 0.2-0.5 part of inorganic nitride powder, 2-3 parts of siliceous composite antioxidant and 6-8 parts of solvent.
The magnesium-carbon stopper rod body comprises the following raw materials in parts by weight: 54-60 parts of fused magnesia, 6-10 parts of active alpha alumina powder, 18-22 parts of crystalline flake graphite, 6-8 parts of solid phenolic resin powder, 0.1-0.6 part of inorganic nitride powder, 2-3 parts of magnesium shield and 6-8 parts of solvent.
The aluminum-magnesium-carbon stopper rod head comprises the following raw materials in parts by weight: 70-80 parts of electrofused aluminum magnesium spinel, 3-6 parts of active alpha alumina powder, 6-10 parts of crystalline flake graphite, 5-8 parts of solid phenolic resin powder, 0.3-0.8 part of inorganic nitride powder and 5-8 parts of solvent.
The magnesium-carbon stopper rod head comprises the following raw materials in parts by weight: 75-80 parts of fused magnesia, 8-12 parts of crystalline flake graphite, 6-7 parts of solid phenolic resin powder, 0.2-0.5 part of inorganic nitride powder, 1.4-1.8 parts of magnesium shield and 5-6 parts of solvent.
The magnesium-carbon stopper rod slag line comprises the following raw materials in parts by weight: 60-68 parts of fused magnesia, 20-25 parts of crystalline flake graphite, 6-10 parts of solid phenolic resin powder, 0.1-0.5 part of inorganic nitride powder, 1-3 parts of magnesium shield and 5-8 parts of solvent.
The stopper rod for continuous casting is prepared by adopting the following method and comprises the following steps of:
s1, respectively adding raw materials of a stopper body, a stopper head and a stopper slag line with the formula amount into a mixing granulator for granulation to prepare granules with granularity within 1mm, and then drying until the volatile content is within 5%, so as to respectively obtain mud granules of the stopper body, the stopper head and the stopper slag line;
s2, filling mud particles of the stopper rod body, the stopper rod head and the stopper rod slag line obtained in the step S1 into a die, and carrying out static pressure pressing for 30-60S under the pressure of 32-36 mpa to obtain a stopper rod mud blank;
s3, drying the stopper rod mud blank prepared in the step S2 for more than 7 hours at the temperature of 180-240 ℃ to prepare a stopper rod rough blank;
and S4, sintering the crude stopper rod blank obtained in the step S3 at a high temperature of 920-980 ℃ to obtain a stopper rod finished product.
Before the application, the continuous casting stopper rod is mainly divided into two types, wherein one type is an integral homogeneous stopper rod, namely the stopper rod is integrally prepared by adopting the same material; the other is a composite stopper rod, namely the most erodible head and slag line part of the stopper rod are made of different materials from the stopper rod body, and are prepared by adopting a composite static pressing blank and finally firing. The main body of the stopper rod is mainly made of aluminum carbon materials, and the raw materials are mainly corundum and graphite.
The existing integral homogeneous stopper rod is mostly fired by adopting aluminum carbon materials, and the improvement of the erosion resistance and the thermal shock resistance of the stopper rod is mainly realized by adding ZrO in a raw material formula 2 、ZrO 2 Refractory materials such as C and MgO-C. The stopper rod has limited service life and is easy to soften, deform and fracture after being soaked in molten steel for a long time; in addition, the head portion of the stopper rod and the portion immersed in molten steel are liable to be peeled off, and even if the stopper rod is not broken, the stopper rod is liable to be disabled by peeling off the material of the head portion, and the stopper rod is liable to be disabled by blocking the nozzle.
The composite stopper rod is the main stream in the current market, and is prepared from heterogeneous refractory materials, and a refractory material with more excellent performance is adopted as a material in the parts of the stopper rod, which are easily eroded, of the head and the slag line, so that the stopper rod integrally forms a composite body consisting of a body, the head and the slag line. The composite stopper rod has relatively excellent erosion resistance and thermal shock resistance, is not easy to break under molten steel soaking, and has longer service life. However, after the composite stopper rod is soaked in molten steel for a long time, the stopper rod and slag line part also have the problem of peeling, the peeled part falls into the molten steel to influence the quality of the molten steel, and after the stopper rod peels to a certain degree, the stopper rod can not block a water gap.
The inventors of the present application studied the problem of the conventional stopper rod flaking, and found that the core cause of the problem is that the bonding strength of the conventional refractory material after sintering molding is insufficient under continuous high temperature and molten steel flushing.
The inventor has designed the technical scheme of this application to this problem, adopts compound stopper stick, has carried out the improvement of raw materials ratio. By adopting special proportioning design and adopting the aluminum-magnesium-carbon or magnesium-carbon stopper rod body, the aluminum-magnesium-carbon or magnesium-carbon stopper rod head and the magnesium-carbon stopper rod slag line, not only is the molten steel erosion resistance of the stopper rod head and the slag line effectively improved, but also the thermal deformation rate of each part of the stopper rod is effectively ensured to be very close, and further the spalling resistance of the stopper rod head and the slag line is effectively enhanced.
The following is a preparation example of the present application.
Preparation example 1
The preparation method of the long nozzle for continuous casting of the preparation example comprises the following steps:
s1, respectively feeding raw materials of a stopper rod body, a stopper rod head and a stopper rod slag line into a mixing granulator for granulation, sieving to obtain granules with granularity within 1mm, and continuously feeding the rest materials into the mixing granulator for granulation until more than 95% of the raw materials are granulated; drying until the volatile content is within 5%, and respectively obtaining pug particles of the stopper rod body, the stopper rod head and the stopper rod slag line;
s2, filling mud particles of the stopper rod body, the stopper rod head and the stopper rod slag line obtained in the step S1 into a mould in batches according to the structure of the composite stopper rod, and carrying out static pressure pressing for 60S under the pressure of 32Mpa to obtain a stopper rod mud blank;
s3, drying the stopper rod mud blank prepared in the step S2 at 180 ℃ for 10 hours to prepare a stopper rod rough blank;
s4, sintering the crude stopper rod blank obtained in the step S3 at a high temperature of 920 ℃ to obtain a finished stopper rod product.
Preparation example 2
The preparation method of the long nozzle for continuous casting of the preparation example comprises the following steps:
s1, respectively feeding raw materials of a stopper rod body, a stopper rod head and a stopper rod slag line into a mixing granulator for granulation, sieving to obtain granules with granularity within 1mm, and continuously feeding the rest materials into the mixing granulator for granulation until more than 98% of the raw materials are granulated; drying until the volatile content is within 3%, and respectively obtaining pug particles of the stopper rod body, the stopper rod head and the stopper rod slag line;
s2, filling mud particles of the stopper rod body, the stopper rod head and the stopper rod slag line obtained in the step S1 into a mould in batches according to the structure of the composite stopper rod, and carrying out static pressure pressing for 40S under the pressure of 34Mpa to obtain a stopper rod mud blank;
s3, drying the stopper rod mud blank prepared in the step S2 at 200 ℃ for 8 hours to prepare a stopper rod rough blank;
s4, sintering the crude stopper rod blank obtained in the step S3 at a high temperature of 930 ℃ to obtain a finished stopper rod product.
Preparation example 3
The preparation method of the long nozzle for continuous casting of the preparation example comprises the following steps:
s1, respectively feeding raw materials of a stopper rod body, a stopper rod head and a stopper rod slag line into a mixing granulator for granulation, sieving to obtain granules with granularity within 1mm, and continuously feeding the rest materials into the mixing granulator for granulation until more than 98% of the raw materials are granulated; drying until the volatile content is within 3%, and respectively obtaining pug particles of the stopper rod body, the stopper rod head and the stopper rod slag line;
s2, filling mud particles of the stopper rod body, the stopper rod head and the stopper rod slag line obtained in the step S1 into a mould in batches according to the structure of the composite stopper rod, and carrying out static pressure pressing for 50S under the pressure of 34Mpa to obtain a stopper rod mud blank;
s3, drying the stopper rod mud blank prepared in the step S2 at 220 ℃ for 8 hours to prepare a stopper rod rough blank;
s4, sintering the crude stopper rod blank obtained in the step S3 at a high temperature of 960 ℃ to obtain a finished stopper rod product.
Preparation example 4
The preparation method of the long nozzle for continuous casting of the preparation example comprises the following steps:
s1, respectively feeding raw materials of a stopper rod body, a stopper rod head and a stopper rod slag line into a mixing granulator for granulation, sieving to obtain particles with the granularity of 0.5-1 mm, and continuously feeding the rest materials into the mixing granulator for granulation until more than 95% of the raw materials are granulated; drying until the volatile content is within 5%, and respectively obtaining pug particles of the stopper rod body, the stopper rod head and the stopper rod slag line;
s2, filling mud particles of the stopper rod body, the stopper rod head and the stopper rod slag line obtained in the step S1 into a mould in batches according to the structure of the composite stopper rod, and carrying out static pressure pressing for 30S under the pressure of 36Mpa to obtain a stopper rod mud blank;
s3, drying the stopper rod mud blank prepared in the step S2 at 240 ℃ for 7 hours to prepare a stopper rod rough blank;
s4, sintering the crude stopper rod blank obtained in the step S3 at a high temperature of 980 ℃ to obtain a finished stopper rod product.
The following are examples of the present application.
The sources of the raw materials selected in the embodiment of the application are as follows: fused aluminum magnesium spinel, brands A40#, A120#, A240#, henan Feng Kai refractory Co., ltd; fused magnesia, brands A40#, A120#, A240#, henan Feng Kai refractory Co., ltd; activated alpha alumina powder, shanghai machine pure industries, inc.; flake graphite, brands S95, S99, shanghai machine pure industries, inc; graphite micropowder, micron grade, shanghai machine pure industry Co., ltd; phenolic resin binder is used for refractory materials, which consolidates the market macros and binder factories; solid phenolic resin powder, jinan Muming New Material Co., ltd; silicon nitride powder, boron nitride powder, aluminum nitride powder, shanghai machine pure industry Co., ltd; siliceous composite antioxidants, incorporated macromap refractory limited; magnesium shield, dalian magnesium shield refractory Co., ltd; cyclohexyl alcohol, hubei Heng Jing Rui chemical Co., ltd.
The following are examples 1-6 of the present application, and the raw material ratios of the specific stopper rod body and stopper rod head of examples 1-6 of the present application are shown in tables 1 and 2, respectively.
In examples 1 to 6, the raw material formulation of the magnesium-carbon integral stopper manufactured by Yixing, asahi-glass material products Co., ltd was used as the raw material formulation of the stopper slag line, and the magnesium oxide content was 70% or more.
The electric smelting aluminum magnesium spinel and the electric smelting magnesia adopt A120 specification, the active alpha alumina powder and the inorganic nitride powder adopt micron-sized micro powder, the crystalline flake graphite adopts brand S95 powder, and the magnesia shield adopts micron-sized powder.
The composite stopper rods of examples 1 to 6 of the present application were prepared by the preparation method of preparation example 2 of the present application.
Table 1 examples 1 to 6 stopper body raw material proportioning table
Table 2 examples 1 to 6 stopper rod head raw material proportioning table
The optimal example of the invention patent with publication number of CN105418094A and the invention name of the invention is a long-service-life spinel material integral stopper is taken as a comparative example. The Q235B carbon steel continuous casting production line is used as a detection production line to detect the apparent porosity, the longest service life and the molten steel erosion resistance depth of the stopper rods of the embodiments 1-6 and the stopper rods of the comparative examples. 10 samples were taken for each sample, the average was calculated and the results obtained are shown in Table 3.
Wherein, the apparent porosity is detected by adopting a method described in national standard GB/T2997-2015, and the molten steel erosion resistance depth is measured by adopting a size after continuously soaking molten steel for 48 hours, and the average value is calculated. The service life is calculated by continuously using the molten steel after the stopper rod blocks the water gap.
Table 3 examples 1 to 6 test result tables
As can be seen from the data in Table 3, the integral stopper rods in examples 1 to 6 of the present application are manufactured by pressing a mud blank at a low pressure and then firing the mud blank at a static pressure, and compared with the stopper rod in the comparative example manufactured by pressing the mud blank at a high pressure and then firing the mud blank, the stopper rod has lower apparent porosity, higher density and longer service life than the stopper rod in the comparative example. In addition, the integral stopper rod of embodiments 1-6 of the application can control the erosion depth to be within 0.5mm after molten steel erosion for 48 hours, so that the integral size integrity of the stopper rod is effectively ensured, the peeling resistance is very excellent, the accuracy of the stopper rod on molten steel flow control can be effectively ensured, and the quality of molten steel can be ensured. It can also be seen from the data in Table 3 that when the stopper rod of the present application employs an aluminum magnesium carbon rod head, the overall performance of the stopper rod is slightly better than that of the stopper rod employing a magnesium carbon rod head.
The applicant conducted further intensive studies on the preparation process of the present application, and prepared the stopper rod using the formulation of example 2 using preparation example 1, preparation example 3 and preparation example 4, respectively, and then conducted performance test. The detection results show that the performance of the stopper rod is reduced by 2-5% by adopting the preparation methods of preparation example 1, preparation example 3 and preparation example 4, and therefore, the preparation process of preparation example 2 is optimal.
The applicant conducted the study on the raw material ratios of the present application, and examples 7 to 10 of the present application are below, based on example 2.
Example 7
This example differs from example 2 in that the flake graphite in the body and club head formulations was replaced with micron-sized graphite powder.
Example 8
This example differs from example 2 in that the phenolic resin powder in the body and club head formulation was replaced with a liquid phenolic resin binder.
Example 9
This example differs from example 2 in that the inorganic nitride powder in the bulk and club head formulations was replaced with a siliceous composite antioxidant.
Example 10
This example differs from example 2 in that both the fused aluminum magnesium spinel and fused magnesia in the body and club head formulations were replaced with fused corundum.
The performance of the stopper rods of examples 7 to 10 of the present application was also tested using the Q235B carbon steel continuous casting line as a test line, and the results are shown in Table 4.
Table 4 examples 7 to 10 test result tables
As can be seen from the results in table 4, the performance of the stopper rods of examples 7 to 10 of the present application is significantly reduced compared with the stopper rod of example 2, and particularly, the performance is significantly reduced after the antioxidant is replaced with other antioxidants from the inorganic nitride powder and the main raw material is replaced with the same fused corundum as the stopper rod body. Therefore, the application adopts the specific main raw material and the specific inorganic nitride powder as the antioxidant, so that obvious performance improvement is obtained.
The applicant further optimizes the proportions of the present application, and the following are the raw material proportions of the stopper body and stopper head of examples 11 to 16 of the present application, see tables 5 and 6 below, respectively.
Table 5 examples 11 to 16 stopper body raw material proportioning table
Table 6 examples 11 to 16 stopper rod head raw material proportioning table
The properties of the stopper rods of examples 11 to 16 of the present application were measured using a Q235B carbon steel continuous casting line as a measuring line, and the results are shown in Table 7.
Table 7 examples 11 to 16 test result tables
As can be seen from the data in Table 7, the overall performance of the overall stopper rods of examples 11-16 of the present application was further improved after further optimizing the formulation.
The applicant studied and optimized the particle size grading of the raw material powder, examples 17 to 26 of the present application are below based on example 12 and example 15, respectively.
Example 17
This example differs from example 12 in that 45 parts of powder with the trade name a40# and 12 parts of powder with the trade name a240# are used for the fused aluminum magnesium spinel of the stopper rod body of this example.
Example 18
This example differs from example 17 in that the fused magnesia of the stopper rod head of this example is made of 55 parts of powder with the trade name A40# and 21 parts of powder with the trade name A240#.
Example 19
The difference between this example and example 18 is that the crystalline flake graphite of this example is powder of grade S99.
Example 20
The difference between this example and example 19 is that the particle size of the active alpha alumina powder and the inorganic nitride powder of this example was controlled to 325 mesh or more.
Example 21
The difference between this embodiment and embodiment 20 is that the particle size distribution of the pug particles of the stopper rod head of this embodiment needs to be controlled as follows: particles with the particle size of more than 1mm account for 5-10%, particles with the particle size of 0.5-1 mm account for 40-50%, particles with the particle size of 0.2-0.5 mm account for 20-25%, particles with the particle size of 0.1-0.2 mm account for 10-15%, particles with the particle size of 0.074-0.1 mm account for 10-15%, and particles with the particle size of less than 0.074mm account for 0-5%; the particle size distribution of mud particles of the stopper slag line needs to be controlled as follows: the particle with the particle size of more than 1mm accounts for 5-10%, the particle with the particle size of 0.5-1 mm accounts for 35-45%, the particle with the particle size of 0.2-0.5 mm accounts for 20-25%, the particle with the particle size of 0.1-0.2 mm accounts for 15-20%, the particle with the particle size of 0.074-0.1 mm accounts for 10-15%, and the particle with the particle size of less than 0.074mm accounts for 0-5%.
The volatile matter of mud particles of the stopper rod head is controlled to be about 2.4%, and the volatile matter of a stopper rod slag line is controlled to be about 2.7%.
Example 22
The difference between this example and example 15 is that 45 parts of powder with the trade name A40# and 12 parts of powder with the trade name A240# are adopted in the fused magnesia of the stopper rod body of this example.
Example 23
This example differs from example 22 in that the fused aluminum magnesium spinel of the stopper rod head of this example is made of 48 parts powders of A40# and 28 parts powders of A240#.
Example 24
The difference between this example and example 22 is that the flake graphite of this example uses powder of grade S99.
Example 25
The difference between this example and example 24 is that the particle size of the inorganic nitride powder in this example was controlled to 325 mesh or more.
Example 26
The difference between this embodiment and embodiment 25 is that the particle size distribution of the pug particles of the stopper rod head of this embodiment needs to be controlled as follows: particles with the particle size of more than 1mm account for 5-10%, particles with the particle size of 0.5-1 mm account for 40-50%, particles with the particle size of 0.2-0.5 mm account for 20-25%, particles with the particle size of 0.1-0.2 mm account for 10-15%, particles with the particle size of 0.074-0.1 mm account for 10-15%, and particles with the particle size of less than 0.074mm account for 0-5%; the particle size distribution of mud particles of the stopper slag line needs to be controlled as follows: the particle with the particle size of more than 1mm accounts for 5-10%, the particle with the particle size of 0.5-1 mm accounts for 35-45%, the particle with the particle size of 0.2-0.5 mm accounts for 20-25%, the particle with the particle size of 0.1-0.2 mm accounts for 15-20%, the particle with the particle size of 0.074-0.1 mm accounts for 10-15%, and the particle with the particle size of less than 0.074mm accounts for 0-5%.
The volatile matter of mud particles of the stopper rod head is controlled to be about 2.35%, and the volatile matter of a stopper rod slag line is controlled to be about 2.7%.
The properties of the stopper rods of examples 17 to 26 of the present application were measured using a Q235B carbon steel continuous casting line as a measuring line, and the results are shown in Table 8.
Table 8 examples 17 to 26 test result tables
As can be seen from the data in Table 8, after the particle sizes of the components are optimized, the performances of the stopper rod can be obviously improved. Particularly, the main raw materials with different particle sizes are adopted to form grading, and then the particle size ratio of mud particles is optimized, so that the performance of the stopper rod is obviously improved.
The applicant also optimizes the raw material ratio of the stopper slag line of the present application, examples 27 to 29 of the present application are described below, and the stopper body and stopper head of examples 27 to 29 of the present application employ the same ratio and raw material particle diameter as those of example 21.
The raw material ratios of the stopper rod bodies of examples 27 to 32 of the present application are shown in table 9 below.
The magnesium-carbon stopper rod slag line comprises the following raw materials in parts by weight: 62-65 parts of fused magnesia, 20-24 parts of crystalline flake graphite, 6-8 parts of solid phenolic resin powder, 0.2-0.5 part of inorganic nitride powder, 1-2 parts of magnesium shield and 6-7 parts of solvent.
Table 9 examples 27 to 32 stopper slag line raw material proportioning table
In the embodiment 27-29, the fused magnesia adopts mixed powder composed of powder with the trademark 40# and powder with the trademark 240#, and the mass ratio of the powder with the trademark 40# to the powder with the trademark 240# is 1.75:1.
In the embodiment 27-29, the crystalline flake graphite is powder with the brand S95#, the particle size of the inorganic nitride powder is controlled to be more than 325 meshes, and the particle size of the magnesium shield is controlled to be within 1 mm.
The performance of the stopper rods of examples 27 to 29 of the present application was examined using the Q235B carbon steel continuous casting line as the inspection line, and the results are shown in Table 10.
Table 10 test results tables of examples 27 to 29
It can be seen from the data in table 10 that after the stopper rod body with a specific proportion is adopted in the method, the degree of fit between the stopper rod body and the stopper rod head as well as the stopper rod slag line is better, and the overall performance of the stopper rod can be further improved. It can also be seen from the data in table 10 that the overall performance of the stopper is optimal after the application uses an aluminum magnesium carbon stopper body, a magnesium carbon stopper head, and a specific magnesium carbon stopper slag line.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (8)
1. A continuous casting stopper rod comprises a stopper rod body, a stopper rod head and a stopper rod slag line which are compounded on the stopper rod body, and is characterized in that,
the stopper rod body is made of aluminum, magnesium and carbon, the stopper rod head is made of magnesium and carbon, and the stopper rod slag line is made of magnesium and carbon; or the stopper rod body is made of magnesia carbon, the stopper rod head is made of alumina magnesia carbon, and the stopper rod slag line is made of magnesia carbon;
the aluminum-magnesium-carbon stopper rod comprises the following raw materials in parts by weight: 55-60 parts of electrofused aluminum magnesium spinel, 6-8 parts of active alpha alumina powder, 18-22 parts of crystalline flake graphite, 6-8 parts of solid phenolic resin powder, 0.2-0.5 part of inorganic nitride powder, 2-3 parts of siliceous composite antioxidant and 6-8 parts of solvent;
the magnesium-carbon stopper rod body comprises the following raw materials in parts by weight: 54-60 parts of fused magnesia, 6-10 parts of active alpha alumina powder, 18-22 parts of crystalline flake graphite, 6-8 parts of solid phenolic resin powder, 0.1-0.6 part of inorganic nitride powder, 2-3 parts of magnesium shield and 6-8 parts of solvent;
the aluminum-magnesium-carbon stopper rod head comprises the following raw materials in parts by weight: 70-80 parts of electrofused aluminum magnesium spinel, 3-6 parts of active alpha alumina powder, 6-10 parts of crystalline flake graphite, 5-8 parts of solid phenolic resin powder, 0.3-0.8 part of inorganic nitride powder and 5-8 parts of solvent;
the magnesium-carbon stopper rod head comprises the following raw materials in parts by weight: 75-80 parts of fused magnesia, 8-12 parts of crystalline flake graphite, 6-7 parts of solid phenolic resin powder, 0.2-0.5 part of inorganic nitride powder, 1.4-1.8 parts of magnesium shield and 5-6 parts of solvent;
the magnesium-carbon stopper rod slag line comprises the following raw materials in parts by weight: 62-65 parts of fused magnesia, 20-24 parts of crystalline flake graphite, 6-8 parts of solid phenolic resin powder, 0.2-0.5 part of inorganic nitride powder, 1-2 parts of magnesium shield and 6-7 parts of solvent.
2. A stopper rod for continuous casting according to claim 1, wherein the magnesium shield is a magnesium shield powder having a particle size of 1mm or less.
3. The continuous casting stopper according to claim 1, wherein the particle size of the active alpha alumina powder and the inorganic nitride powder is controlled to 325 mesh or more.
4. A stopper rod for continuous casting according to claim 1, wherein the inorganic nitride powder is selected from at least two of silicon nitride, boron nitride and aluminum nitride.
5. The continuous casting stopper rod according to claim 1, wherein the particle size of the fused aluminum magnesium spinel is controlled to be 50-500 μm, two kinds of fused aluminum magnesium spinels are adopted, and the particle size difference of the fused aluminum magnesium spinels is controlled to be more than 200 μm.
6. The stopper rod for continuous casting according to claim 1, wherein the grain size of the fused magnesia is controlled to be 50-500 μm, fused magnesia with two grain sizes is adopted, and the grain size difference of the fused magnesia with two grain sizes is controlled to be more than 200 μm.
7. A method of producing a stopper rod for continuous casting as claimed in claim 1, comprising the steps of:
s1, respectively adding raw materials of a stopper body, a stopper head and a stopper slag line with the formula amount into a mixing granulator for granulation to prepare granules with granularity within 1mm, and then drying until the volatile content is within 5%, so as to respectively obtain mud granules of the stopper body, the stopper head and the stopper slag line;
s2, filling mud particles of the stopper rod body, the stopper rod head and the stopper rod slag line obtained in the step S1 into a die, and carrying out static pressure pressing for 30-60S under the pressure of 32-36 MPa to obtain a stopper rod mud blank;
s3, drying the stopper rod mud blank prepared in the step S2 for more than 7 hours at the temperature of 180-240 ℃ to prepare a stopper rod rough blank;
and S4, sintering the crude stopper rod blank obtained in the step S3 at a high temperature of 920-980 ℃ to obtain a stopper rod finished product.
8. The method according to claim 7, wherein in the step S1, the drying process is performed with the control of the volatile content of the mud particles of the stopper body, the stopper head and the stopper slag line to be 2.2-2.8%.
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