CN111347021B - Special continuous casting crystallizer function protection material for ESP high-carbon steel - Google Patents
Special continuous casting crystallizer function protection material for ESP high-carbon steel Download PDFInfo
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- CN111347021B CN111347021B CN202010246469.9A CN202010246469A CN111347021B CN 111347021 B CN111347021 B CN 111347021B CN 202010246469 A CN202010246469 A CN 202010246469A CN 111347021 B CN111347021 B CN 111347021B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/07—Lubricating the moulds
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Abstract
The invention belongs to the technical field of metallurgical auxiliary materials, and particularly relates to a special continuous casting crystallizer function protection material for ESP high-carbon steel. Comprises the following raw material components in percentage by weight: pre-melting material: 40-50% of caustic soda: 6.5-10.5%, fluorite powder: 17-23%, sodium fluoride: 0.5-5%, bentonite: 0.5-5%, calcite: 4-8%, manganese carbonate: 0.5-5%, lithium carbonate: 6-10%, carbon black: 0.5-5%, graphite carbon: 0.5-5% and 0.1-3.2% of calcium lignosulphonate.
Description
Technical Field
The invention belongs to the technical field of metallurgical auxiliary materials, and particularly relates to a special continuous casting crystallizer function protection material for ESP high-carbon steel.
Background
The major technologies of thin plate continuous casting and rolling, which are put into industrial production in the world at present, are the 6 types of processes, namely CSP, ISP, QSP, FTSR, CONROLL and TSP. Although the production line has mature technology and high reliability, the production line can not produce thinner and wider (such as the degree is less than or equal to 0.8 mm, and the width is more than or equal to 1200 mm) strip steel; and when the speed limit and the load limit are reached, the rolling process becomes indefinite, and the problems of difficult threading, steel strip wave shape, rolled opening damage, out-of-tolerance and the like occur. Therefore, the Italian Avidi company and China jointly develop an ESP ultrathin strip steel rolling production line, and the extremely thin hot-rolled wide strip steel is produced by a composite continuous casting-rolling combined process, so that the method has outstanding advantages in the technology of rolling high-quality wide sheets of various steel types. At present, an ESP production line is developed into a stable high-quality hot rolled strip steel production line, and certain products replace cold rolled products.
Compared with the traditional plate line, the high-carbon steel produced by the ESP production line has the series advantages of light casting blank carbon segregation degree, good component uniformity, small size of non-metal precipitate, light hot coil surface decarburization, small pearlite lamellar spacing of a product, good structural performance stability, high product size precision, small thickness tolerance and the like, but the control of longitudinal cracks on the surface of the casting blank at the ESP high pulling speed is a key point for restricting the success of the development of the high-carbon steel.
The high-carbon steel is in a zero plastic zone at the temperature of more than 1250 ℃, and the solidification front edge is cracked due to small strain; the casting blank has the same poor shaping property and larger crack tendency within the range of 1050-1250 ℃. The ESP high-pulling-speed production promotes the non-uniformity of heat transfer between the casting blank and the crystallizer and solidification of the casting blank, the thickness of the blank shell is thinner near the width center of the casting blank, and the stress difference between the thicker and thinner blank shells can cause the cracking of the casting blank. This puts higher demands on the mold flux between the casting blank and the mold; the continuous casting temperature of the high-carbon steel is lower than that of the carbon steel by hundreds of degrees, the temperature of a meniscus is lower, and the melting temperature of the casting powder melted by the temperature of molten steel is lower; the liquid level fluctuation at high pulling speed has strict requirements on the continuous casting which needs to form a stable and uniform liquid slag layer by melting a meniscus; the requirements on composite carbon preparation and flux control are high.
The design and development of the ESP high-carbon steel covering slag fill the market blank, promote the further development of the metallurgical industry, actively promote the product quality and the production stability, and create higher economic value and brand value for customers.
Chinese patent with publication number CN106513606B discloses a special casting mold powder for IF steel, which comprises the following chemical components in percentage by weight: CaO: 38-42% of SiO2：28-33%，MgO：6-9%，Al2O3：5-9%，Na2O：3-5％，MnO2：3-5%，F：2-5%，CFixing device: 1-2%, the balance being unavoidable impurities, alkalinity: 1.1-1.5, melting point: 950-: 0.25-0.45 Pa · s. But the method is not suitable for ESP high-carbon steel, the three-layer structure of the covering slag is easy to be unstable, the performance of the covering slag is unstable, and the conditions of slag inclusion, cracks and steel leakage exist at high drawing speed; the patent covering slag is not suitable for ESP high-carbon steel.
The Chinese patent application with the publication number of CN106735023A discloses a function protection material for a continuous casting crystallizer special for high-oxygen enamel steel, which relates to metallurgical auxiliary materials and is prepared from the following raw materials in percentage by weight: 55.0-62.5% of premelting material, 4-6% of lithium carbonate, 4-6% of caustic soda ash, 1-3% of bentonite, 8-10% of high-grade fluorite powder, 1-4% of high alumina, 4-6% of cryolite, 3-5% of sodium fluoride, 2-4% of albite, 2-4% of fine glass powder, 0-2% of imported carbon black and 0-2% of graphite, wherein the sum of the content of the raw materials is 100%. The material is specially used for high-oxygen enamel steel, can be properly spread in a crystallizer, and has no sintering and agglomeration phenomena; the melting is uniform, and a stable three-layer structure is achieved; the thickness of the liquid slag layer is 8-12 mm; the consumption of each ton of steel slag is 0.3-0.5 kg; the surface, the skin and the interior of the cast blank are good in quality. However, the liquid slag layer of the patent is thin, so that the inflow of a slag film is uneven, slag inclusion and steel leakage are easily caused, and the liquid slag layer is not suitable for ESP high-carbon steel.
Disclosure of Invention
The invention aims to provide a continuous casting crystallizer function protection material for air valve steel, aiming at solving the problems in the prior art, the protection material not only can meet the requirement of crystallizer lubrication during low-temperature casting, but also can ensure better stability of slag, better casting blank quality and low steel leakage rate, and can meet the requirement of users.
The technical scheme of the invention is as follows:
the functional protection material for the continuous casting crystallizer special for the ESP high-carbon steel comprises the following raw material components in percentage by weight: pre-melting material: 40-50% of white alkali: 6.5-10.5%, fluorite powder: 17-23%, sodium fluoride: 0.5-5%, bentonite: 0.5-5%, calcite: 4-8%, manganese carbonate: 0.5-5%, lithium carbonate: 6-10%, carbon black: 0.5-5%, graphite carbon: 0.5-5% and 0.1-3.2% of calcium lignosulphonate.
Specifically, the chemical components of the pre-melting material comprise the following components in percentage by weight: SiO 2255-65%、CaO 22.5-30.5%、Al2O3 5-9%、R2O 0-2%、F-2-7 percent of MgO, 7-13 percent of MgO and the balance of trace elements, wherein R is2O=K2O+Na2O。
Specifically, the functional protection material comprises the following raw material components in percentage by weight: pre-melting material: 45% and caustic soda ash: 7% and fluorite powder: 18%, sodium fluoride: 3% and bentonite: 2% and calcite: 6%, manganese carbonate: 3% and lithium carbonate: 7%, carbon black: 4%, graphite carbon: 3 percent and 2 percent of calcium lignosulphonate.
Specifically, the binary basicity of the slag of the functional protection material is 0.88-1.12, the hemispherical point is 980-1060 ℃, and the viscosity is 0.085-0.130 Pa.s at 1300 ℃.
Specifically, the chemical components and the weight percentage of the chemical components of the special continuous casting crystallizer functional protection material for ESP high-carbon steel are SiO2 25-33%，CaO 25-33%，Al2O3 2-6%，Fe2O3≤1.5%，MgO 2-6%，F- 8-14%，K2O+Na2O 3-8%，MnO 0.5-3.5%,Li21.5 to 4.5 percent of O, 3 to 7 percent of free carbon and the balance of trace elements.
Specifically, the fluorite contains CaF2The content of the sodium fluoride is more than or equal to 97 percent, the content of NaF in the sodium fluoride is more than or equal to 98.5 percent, and Na2CO in the sodium carbonate3The content of (A) is more than or equal to 98 percent.
The protective material provided by the invention has the following positive beneficial effects:
1. the protective material of the invention is added with the high proportion of magnesium-containing premelting material, has better melting uniformity, excellent heat insulation and heat preservation effects and environmental protection performance, has better melting performance, fluidity and spreadability in a crystallizer than the application of the conventional raw material base material, and has lower burning and volatilization.
2. The protective material is added with carbonate lithium carbonate of alkali metal and white alkali, wherein the white alkali is light calcined white alkali, and the heat release quantity of molten steel in a crystallizer is utilized to ensure that the carbonate absorbs heat and decomposes, thereby reducing the melting speed of the protective slag.
3. According to the invention, the carbonaceous material and the binder calcium lignosulfonate are added into the protective material, the calcium lignosulfonate burns before the carbonaceous material and releases gas, so that the consumption of the carbonaceous material is reduced, and meanwhile, residues after the calcium lignosulfonate burns and the carbonaceous material jointly prevent the base material from forming sintering blocks and slag strips, so that the melting speed of the protective slag can be controlled, the recarburization of a casting blank is inhibited, the thickness of the molten slag layer is kept stable, and the quality of the casting blank is improved.
4. According to the invention, various raw materials are matched together, the obtained casting powder has the binary alkalinity of 0.88-1.12, the binary alkalinity is proper, the lubricating effect is good, the crystallization rate of the casting powder is controlled, the thermal resistance of a slag film is increased, the slow cooling effect of a casting blank is achieved, and the generation of cracks is reduced; the hemispherical point is 980-1060 ℃, the hemispherical point is proper and is lower than the surface temperature of the blank shell at the lower opening of the crystallizer, the thickness of a liquid slag layer is increased, and the lubricating effect in the crystallizer is improved; the viscosity is 0.085-0.130 Pa.s at 1300 ℃, the viscosity is moderate, the slag film on the surface of the solidified shell of the casting blank at the upper part of the crystallizer is in a stable fluidity state, the vibration mark depth and the slag inclusion of the vibration mark trough are reduced, the adhesive force of the slag to the vibration mark is reduced, the casting blank quality is improved, the fluidity of the liquid slag at the high drawing speed of ESP high-carbon steel is also ensured, and the stability of the slag film and the improvement of the consumption are promoted.
5. The protective material provided by the invention has a composite silicate structure formed among chemical components, Si-O tetrahedrons are connected by sharing two corners to form a long chain, and when MgO, CaO, Na2O, F-divalent or monovalent alkali metal oxide and fluoride are added into a silicate melt, the network structure of the Si-O tetrahedrons is damaged, and the deformation resistance of the chain is reduced due to the increase of fracture, so that the crystallization temperature of the protective slag is reduced, and the surface tension is improved. The viscosity-temperature curve has a gentle trend in the cooling process at 1300 ℃, the slag film is slowly crystallized and solidified, and the friction force in the slag film lubricating process is lower, so that the blank shell scratches caused by larger friction force are reduced, and the steel leakage phenomenon in the casting process is also reduced; the invention has high surface tension, well stabilizes the liquid level of the crystallizer, and pulls open the distance between the meniscus of the molten steel and the carbon-rich layer and the semi-molten layer, thereby obviously reducing the probability of slag inclusion and recarburization of the casting blank.
Detailed Description
The technical solution of the present invention will be described in detail with reference to specific examples.
The invention will be described in detail by the following 5 examples, and the functional protection material for the ESP high-carbon steel special continuous casting crystallizer provided by the invention is shown in table form, and the raw materials and the weight percentage content of the functional protection material for the ESP high-carbon steel special continuous casting crystallizer provided by the 7 examples are shown in table 1.
The chemical components and weight percentages of the functional protection materials of the continuous casting crystallizer special for the ESP high-carbon steel provided by the examples 1-5 are shown in the table 2.
The chemical compositions and weight percentages of the pre-melted materials of the functional protective materials of the ESP high-carbon steel special continuous casting crystallizer provided by the embodiments 1-5 are shown in Table 3.
The physical and chemical properties of the ESP high-carbon steel special continuous casting crystallizer function protection material provided by the examples 1-5 are shown in Table 4.
Table 1 weight percent (wt%) of each raw material of the functional protective materials provided in examples 1 to 5
Table 2 weight percent (wt%) of chemical composition of the functional protective materials provided in examples 1-5
Table 3 examples 1-5 weight percent (wt%) of the chemical composition of the premelt material
Table 4 examples 1-5 performance parameters of functional protective materials
Application test
ESP high-carbon steel is cast in a certain steel plant, and the process flow is as follows: molten iron pretreatment → combined blown converter → RH → ESP slab continuous casting, wherein the slab continuous casting adopts a vertical bending type slab continuous casting machine, the arc radius is 5.5 m, the effective length of a crystallizer copper plate is 1200mm, and the casting section is as follows: 95X 1250mm, casting pull rate: 3.8-4.2 m/min, and the chemical components of the functional protection material ESP high-carbon steel adopted in the embodiment 1 of the invention are shown in the following table 5.
TABLE 5 molten steel composition of ESP high carbon steel produced using the protective material provided in example 1
The field test shows that: the functional protection material has moderate flame in the crystallizer, uniform melting, less slag strips, the thickness of liquid slag of 13-15mm, prevention of recarburization, reduction of slag entrapment, 0.20-0.24kg of steel consumption per ton, better surface quality of casting blanks and capability of meeting the requirements of users.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (4)
1. The functional protection material for the continuous casting crystallizer special for the ESP high-carbon steel is characterized by comprising the following raw material components in percentage by weight: pre-melting material: 40-50% of white alkali: 6.5-10.5%, fluorite powder: 17-23%, sodium fluoride: 0.5-5%, bentonite: 0.5-5%, calcite: 4-8%, manganese carbonate: 0.5-5%, lithium carbonate: 6-10%, carbon black: 0.5-5%, graphite carbon: 0.5-5% of calcium lignosulphonate and 0.1-3.2% of calcium lignosulphonate;
the chemical components of the pre-melting material comprise the following components in percentage by weight: SiO 22 55-65%、CaO 22.5-30.5%、Al2O3 5-9%、R2O 0-2%、F-2-7 percent of MgO, 7-13 percent of MgO and the balance of trace elements, wherein R is2O=K2O+Na2O；
The binary basicity of the slag of the functional protection material is 0.88-1.12, the hemispherical point is 980-1060 ℃, and the viscosity is 0.085-0.130 Pa.s at 1300 ℃.
2. The functional protection material for the continuous casting crystallizer special for the ESP high-carbon steel according to claim 1, wherein the functional protection material comprises the following raw material components in percentage by weight: pre-melting material: 45% and caustic soda ash: 7% and fluorite powder: 18%, sodium fluoride: 3% and bentonite: 2% and calcite: 6%, manganese carbonate: 3% and lithium carbonate: 7%, carbon black: 4%, graphite carbon: 3 percent and 2 percent of calcium lignosulphonate.
3. The ESP high-carbon steel-dedicated continuous casting crystallizer function protection material as claimed in claim 1,
the chemical components and the weight percentage content of the special continuous casting crystallizer function protection material for ESP high-carbon steel are SiO225-33%，CaO 25-33%，Al2O3 2-6%，Fe2O3≤1.5%，MgO 2-6%，F- 8-14%，K2O+Na2O 3-8%，MnO 0.5-3.5%,Li21.5 to 4.5 percent of O, 3 to 7 percent of free carbon and the balance of trace elements.
4. The functional protection material for the continuous casting crystallizer special for ESP high carbon steel according to claim 1, wherein CaF in the fluorite powder2The content of the sodium fluoride is more than or equal to 97 percent, the content of NaF in the sodium fluoride is more than or equal to 98.5 percent, and Na in the sodium carbonate2CO3The content of (A) is more than or equal to 98 percent.
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