CN117020193A - Mechanical-pressing unfired magnesium-carbon composite tundish nozzle for cord steel - Google Patents
Mechanical-pressing unfired magnesium-carbon composite tundish nozzle for cord steel Download PDFInfo
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- CN117020193A CN117020193A CN202311037836.4A CN202311037836A CN117020193A CN 117020193 A CN117020193 A CN 117020193A CN 202311037836 A CN202311037836 A CN 202311037836A CN 117020193 A CN117020193 A CN 117020193A
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- magnesia
- carbon
- fused
- magnesium
- graphite
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 title claims description 40
- 238000003825 pressing Methods 0.000 title description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 152
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 76
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 41
- 239000002994 raw material Substances 0.000 claims abstract description 35
- 239000010439 graphite Substances 0.000 claims abstract description 31
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 31
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000005011 phenolic resin Substances 0.000 claims abstract description 30
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 30
- 239000000654 additive Substances 0.000 claims abstract description 21
- 230000000996 additive effect Effects 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000005350 fused silica glass Substances 0.000 claims abstract description 13
- 239000004576 sand Substances 0.000 claims abstract description 3
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 229910052582 BN Inorganic materials 0.000 claims description 7
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000011863 silicon-based powder Substances 0.000 claims description 7
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 3
- 238000003723 Smelting Methods 0.000 claims description 2
- 229910001337 iron nitride Inorganic materials 0.000 claims description 2
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 2
- 239000011819 refractory material Substances 0.000 abstract description 3
- 238000009749 continuous casting Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 238000000465 moulding Methods 0.000 description 7
- 239000003575 carbonaceous material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000004880 explosion Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- 229910001928 zirconium oxide Inorganic materials 0.000 description 4
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000011452 unfired brick Substances 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
-
- 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
- C04B35/03—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
-
- 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
- B22D41/50—Pouring-nozzles
-
- 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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- 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
- 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
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
-
- 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
- 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
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
-
- 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
- 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
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/386—Boron nitrides
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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
- 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
- C04B2235/38—Non-oxide ceramic constituents or additives
- 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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- 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
- 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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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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
- 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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/425—Graphite
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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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a mechanically-pressed unfired magnesia carbon composite tundish nozzle for cord steel, which belongs to the technical field of novel continuous casting functional refractory materials and comprises a magnesia carbon bowl part and a magnesia carbon body, wherein the magnesia carbon bowl part takes fused magnesia sand, graphite, additives and phenolic resin as raw materials, and the magnesia carbon bowl part comprises the following raw materials in percentage by weight: 85-92% of fused magnesia, 5-10% of graphite, 1-6% of additive and 4-8% of phenolic resin, wherein the magnesia carbon body is prepared from the raw materials of fused magnesia, fused quartz, graphite, additive and phenolic resin in percentage by weight: 60-80% of fused magnesia, 8-20% of fused quartz, 8-20% of graphite, 1-6% of additive and 5-10% of phenolic resin.
Description
Technical Field
The invention relates to a mechanically-pressed unfired magnesium-carbon composite tundish nozzle for cord steel, belonging to the technical field of novel continuous casting functional refractory materials.
Background
In the metallurgical industry, the wire rod for the steel cord is recognized as a tip product in the wire rod, the production difficulty is very high, in the process of processing the cord steel, filaments with the length of 5.5mm are drawn to be 0.15mm in unit diameter, so that the length of the cord steel is extended by more than 1000 times, and in the subsequent double twisting process, the cord steel is subjected to a series of deformations such as torsion, stretching and bending, and therefore, the requirements of the purity, inclusion size and shape of the steel for the cord steel on the steel per se, the quality of the wire rod surface and the like are quite high, and the cord steel is one of the steel types with the greatest difficulty and the highest quality requirements in the wire rod product.
The greatest problem in producing the cord steel is deep drawing or curling fracture, and during the development of the cord steel, the fracture surface of the broken filaments is analyzed, and the existence of inclusions is found to be an important cause of the broken filaments of the cord steel, and by analyzing the inclusion components, it is known that the inclusions causing the broken filaments in the process are hard A1 which is difficult to be extended and broken during hot rolling and cold working 2 O 3 And ZrO(s) 2 Inclusion is mainly similar to A1 2 O 3 And ZrO(s) 2 The sources of (a) can be mainly divided into crystallization from molten steel and refractory introduction, and thus, the method has pertinency in smelting the cord steelProper refractory materials are designed and selected, so that broken wires in cord steel processing caused by inclusion are avoided.
The prior pouring ladle nozzle of the cast cord steel adopts the traditional aluminum carbon pouring ladle nozzle or zirconium pouring ladle nozzle, and both materials inevitably cause A1 in molten steel 2 O 3 And ZrO(s) 2 Inclusion-like, in order to solve A1 in the process of casting cord steel 2 O 3 And ZrO(s) 2 The problem of inclusion mixing in molten steel, obtaining the cord steel with purer cleanliness and higher quality, and changing the tundish nozzle into the ultralow aluminum zirconium-free magnesium-carbon material is needed to reduce A1 in the cord steel 2 O 3 And ZrO(s) 2 The mixing of brittle inclusions, etc., so that the development of the magnesium carbon material tundish nozzle with ultra-low aluminum and no zirconium for the whole body has practical use value for casting cord steel, but compared with the traditional aluminum carbon tundish nozzle and zirconium tundish nozzle, the magnesium carbon material has the defects of large thermal expansion coefficient and poor thermal shock stability, and the problem of cracking easily occurs when the magnesium carbon material tundish nozzle is used, so that the magnesium carbon material is rarely used as a body material of the tundish nozzle.
Disclosure of Invention
The invention aims to solve the problems and provide a mechanical pressing unfired magnesium-carbon composite tundish nozzle for cord steel, which can achieve proper sintering by means of heat energy in a use environment to form a structure with gradient characteristics, can improve the thermal shock stability of unfired bricks, and can greatly improve the yield of the cord steel and the quality of molten steel.
The invention realizes the aim through the following technical scheme that the mechanical pressing unfired magnesia carbon composite tundish nozzle for the cord steel comprises a magnesia carbon bowl part and a magnesia carbon body, wherein the magnesia carbon bowl part takes fused magnesia sand, graphite, additives and phenolic resin as raw materials, and the magnesia carbon bowl part comprises the following raw materials in percentage by weight: 85-92% of fused magnesia, 5-10% of graphite, 1-6% of additive and 4-8% of phenolic resin, wherein the magnesia carbon body takes the fused magnesia, fused quartz, graphite, additive and phenolic resin as raw materials, and the magnesia carbon body comprises the following raw materials in percentage by weight: 60-80% of fused magnesia, 8-20% of fused quartz, 8-20% of graphite, 1-6% of additive and 5-10% of phenolic resin.
The fused magnesia can be replaced by sintered magnesia, the carbon content is more than or equal to 95%, and the graphite content in the magnesia carbon bulk raw material is as follows: the carbon content is more than or equal to 90 percent, and the chemical components of the fused magnesia in the magnesia bowl raw material are as follows: mgO content is more than 96%, and the chemical components of the fused magnesia in the magnesia carbon bulk raw material are as follows: mgO content is more than 90%, S iO 2 Less than or equal to 10 percent, the additive is one or more of metal silicon powder, silicon carbide powder, metal aluminum powder, silicon nitride, ferrosilicon nitride and boron nitride, the pressure of a friction press is 630-1500 tons, the drying temperature is 200-250 ℃, the carbon residue of the phenolic resin is more than or equal to 40 percent, the solid content is more than or equal to 70 percent, and the viscosity is 10000-20000cps (25 ℃).
The beneficial effects of the invention are as follows: the invention adopts the mechanical pressing molding of the unburned magnesium-carbon composite tundish nozzle, achieves proper sintering by means of heat energy in the use environment, forms a structure with gradient characteristics, utilizes the characteristic that the thermal expansion coefficients of a main material and an additive are inconsistent, enables the unburned bricks to generate enough micro cracks under the use condition, and enables the cracks to expand in a quasi-static mode, thereby improving the thermal shock stability of the unburned bricks, being applied to the production of cord steel, avoiding the phenomenon that the traditional tundish nozzle introduces aluminum or zirconium inclusion into molten steel, resulting in easy breakage in the wire drawing process of the produced cord steel billet, and greatly improving the yield and the quality of the molten steel of the cord steel.
Drawings
FIG. 1 is a schematic view of a composite tundish nozzle according to the present invention.
Fig. 2 is a schematic structural diagram of an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
Fig. 4 is a schematic diagram of a third embodiment of the present invention.
Fig. 5 is a schematic diagram of a fourth embodiment of the present invention.
Fig. 6 is a schematic diagram of a fifth embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-6, a mechanically pressed unfired magnesia carbon composite tundish nozzle for cord steel comprises a magnesia carbon bowl part and a magnesia carbon body, wherein the magnesia carbon bowl part takes fused magnesia, graphite, additives and phenolic resin as raw materials, and the magnesia carbon bowl part comprises the following raw materials in percentage by weight: 85-92% of fused magnesia, 5-10% of graphite, 1-6% of additive and 4-8% of phenolic resin, wherein the magnesia carbon body is prepared from the raw materials of fused magnesia, fused quartz, graphite, additive and phenolic resin in percentage by weight: 60-80% of fused magnesia, 8-20% of fused quartz, 8-20% of graphite, 1-6% of additive and 5-10% of phenolic resin.
The fused magnesia can be replaced by sintered magnesia, the carbon content is more than or equal to 95 percent, and the graphite content in the magnesia carbon bulk raw material is as follows: the carbon content is more than or equal to 90 percent, and the chemical components of the fused magnesia in the magnesia bowl raw material are as follows: mgO content is more than 96%, and the chemical components of the fused magnesia in the magnesia carbon bulk raw material are as follows: mgO content is more than 90%, si O 2 Less than or equal to 10 percent, additive is one or more of metal silicon powder, silicon carbide powder, metal aluminum powder, silicon nitride, silicon iron nitride and boron nitride, the pressure of a friction press is 630-1500 tons, the drying temperature is 200-250 ℃, the residual carbon of phenolic resin is more than or equal to 40 percent, the solid content is more than or equal to 70 percent, and the viscosity is 10000-20000cps (25 ℃).
When the invention is actually used, fused magnesia or sintered magnesia and graphite are adopted as main raw materials, a proper amount of additive is added, phenolic resin is adopted as a bonding agent, and the magnesia carbon bowl part and the body pug are respectively prepared after mixing; and adding the molten steel into a designed mold according to the requirement, forming by adopting a friction machine, and then drying at the temperature of 200-250 ℃ to obtain the required magnesium-carbon composite tundish nozzle.
Example 1
As a technical optimization scheme of the invention, as shown in fig. 2, the weight percentages of the raw materials of the magnesium-carbon bowl part are as follows: 85% of fused magnesia, 10% of graphite, 2% of metal silicon powder, 3% of silicon carbide powder and 8% of added phenolic resin; the weight percentages of the magnesium carbon bulk raw materials are as follows: 60% of fused magnesia, 20% of fused quartz, 15% of graphite, 3% of fused metal silicon powder, 2% of aluminum powder and 8% of added phenolic resin.
After the magnesium carbon bowl part and the magnesium carbon body material are respectively dried, 630 tons of pressure molding is adopted, and then the molding is carried out, the drying is carried out at the temperature of 200 ℃, the manufactured integral composite tundish nozzle is used in a 41-degree furnace of a certain steel mill for 30 hours, the phenomena of explosion and the like are avoided in the use process, and aluminum oxide and zirconium oxide are not mixed in molten steel.
Example two
As a technical optimization scheme of the invention, as shown in figure 3, the weight percentage of the raw materials of the magnesium-carbon bowl part is as follows: 92% of fused magnesia, 5% of graphite, 2% of boron nitride, 1% of silicon nitride powder and 4% of added phenolic resin; the weight percentages of the magnesium carbon bulk raw materials are as follows: 70% of fused magnesia, 15% of fused quartz, 10% of graphite, 3% of boron nitride, 2% of ferrosilicon nitride and 8% of added phenolic resin.
After the magnesium carbon bowl part and the magnesium carbon body material are respectively dried, 630 tons of pressure molding is adopted, and then the molding is carried out, the drying is carried out at the temperature of 200 ℃, the manufactured integral composite tundish nozzle is used in a 45-degree furnace of a certain steel mill for 33.5 hours, the phenomena of explosion and the like are avoided in the use process, and aluminum oxide and zirconium oxide are not mixed in molten steel.
Example III
As a technical optimization scheme of the invention, as shown in fig. 4, the weight percentages of the raw materials of the magnesium-carbon bowl part are as follows: 88% of fused magnesia, 10% of graphite, 2% of boron nitride and 6% of added phenolic resin; the weight percentages of the magnesium carbon bulk raw materials are as follows: 70% of fused magnesia, 12% of fused quartz, 15% of graphite, 3% of silicon nitride iron and 8% of added phenolic resin.
After the magnesium carbon bowl part and the magnesium carbon body material are respectively dried, 1500 tons of pressure molding is adopted, and the integral composite tundish nozzle prepared by drying at 200 ℃ is used in a certain steel mill for 48 furnaces for 36 hours, so that the phenomena of explosion and the like are avoided in the use process, and aluminum oxide and zirconium oxide are not mixed in molten steel.
Example IV
As a technical optimization scheme of the invention, as shown in fig. 5, the weight percentages of the raw materials of the magnesium-carbon bowl part are as follows: 87% of fused magnesia, 8% of graphite, 3% of metal aluminum powder, 2% of silicon nitride and 7% of added phenolic resin; the weight percentages of the magnesium carbon bulk raw materials are as follows: 76% of fused magnesia, 8% of fused quartz, 10% of graphite, 3% of fused metal silicon powder, 3% of ferrosilicon nitride and 8% of added phenolic resin.
After the magnesium carbon bowl part and the magnesium carbon body material are respectively dried and molded by adopting 1000 tons of pressure, the whole composite tundish nozzle manufactured by drying the whole composite tundish nozzle at 200 ℃ is used for 30 furnaces in a certain steel mill for 22.5 hours, the phenomena of explosion and the like are avoided in the use process, and alumina and zirconia are not mixed in molten steel.
Example five
As a technical optimization scheme of the invention, as shown in fig. 6, the weight percentages of the raw materials of the magnesium-carbon bowl part are as follows: 90% of fused magnesia, 8% of graphite, 1% of metal aluminum powder, 1% of boron nitride and 7% of added phenolic resin; the weight percentages of the magnesium carbon bulk raw materials are as follows: 66% of fused magnesia, 20% of fused quartz, 10% of graphite, 1% of fused metal silicon powder, 3% of silicon carbide and 8% of added phenolic resin.
After the magnesium carbon bowl part and the magnesium carbon body material are respectively dried, 1500 tons of pressure molding is adopted, and then the whole composite tundish nozzle is manufactured by drying at 200 ℃, a 55 furnace is used in a certain steel mill for 42 hours, the phenomena of explosion and the like are avoided in the use process, and aluminum oxide and zirconium oxide are not mixed in molten steel.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (8)
1. The utility model provides a package mouth of a river in machine pressure unburned magnesium carbon complex for cord steel which characterized in that: the magnesia carbon bowl comprises a magnesia carbon bowl body and a magnesia carbon body, wherein the magnesia carbon bowl body takes fused magnesia sand, graphite, additives and phenolic resin as raw materials, and the magnesia carbon bowl body comprises the following raw materials in percentage by weight: 85-92% of fused magnesia, 5-10% of graphite, 1-6% of additive and 4-8% of phenolic resin, wherein the magnesia carbon body takes the fused magnesia, fused quartz, graphite, additive and phenolic resin as raw materials, and the magnesia carbon body comprises the following raw materials in percentage by weight: 60-80% of fused magnesia, 8-20% of fused quartz, 8-20% of graphite, 1-6% of additive and 5-10% of phenolic resin.
2. The mechanically pressed unfired magnesium carbon composite tundish nozzle for cord steel according to claim 1, wherein: the fused magnesia can be replaced by sintered magnesia.
3. The mechanically pressed unfired magnesium carbon composite tundish nozzle for cord steel according to claim 1, wherein: the graphite content in the raw materials of the magnesium carbon bowl part is as follows: the carbon content is more than or equal to 95%, and the graphite content in the magnesia carbon bulk raw material is as follows: the carbon content is more than or equal to 90 percent.
4. The mechanically pressed unfired magnesium carbon composite tundish nozzle for cord steel according to claim 1, wherein: the electric smelting magnesia in the magnesia carbon bowl raw material comprises the following chemical components: mgO content is greater than 96%.
5. The mechanically pressed unfired magnesium carbon composite tundish nozzle for a cord steel according to claim 4, wherein: the chemical components of the fused magnesia in the magnesia carbon bulk raw material are as follows: mgO content is more than 90%, siO 2 ≤10％。
6. The mechanically pressed unfired magnesium carbon composite tundish nozzle for cord steel according to claim 1, wherein: the additive is one or more of metal silicon powder, silicon carbide powder, metal aluminum powder, silicon nitride, silicon iron nitride and boron nitride.
7. The mechanically pressed unfired magnesium carbon composite tundish nozzle for cord steel according to claim 1, wherein: the pressure of the friction press is 630-1500 tons, and the drying temperature is 200-250 ℃.
8. The mechanically pressed unfired magnesium carbon composite tundish nozzle for cord steel according to claim 1, wherein: the carbon residue of the phenolic resin is more than or equal to 40%, the solid content is more than or equal to 70%, and the viscosity is 10000-20000cps (25 ℃).
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| CN202311037836.4A CN117020193A (en) | 2023-08-17 | 2023-08-17 | Mechanical-pressing unfired magnesium-carbon composite tundish nozzle for cord steel |
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| CN202311037836.4A CN117020193A (en) | 2023-08-17 | 2023-08-17 | Mechanical-pressing unfired magnesium-carbon composite tundish nozzle for cord steel |
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