CN110918914A - Continuous casting crystallizer casting powder of super wear-resistant steel, preparation method and application - Google Patents
Continuous casting crystallizer casting powder of super wear-resistant steel, preparation method and application Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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Abstract
The invention discloses a continuous casting crystallizer covering slag of super wear-resistant steel, a preparation method and application thereof, wherein the covering slag comprises the following chemical components in parts by weight: 30-35 parts of CaO and 25-30 parts of SiO20.5-2.5 parts by weight of MgO and 0.0-2.0 parts by weight of Al2O30.0 to 2.0 parts by weight of Fe2O37.0-10.0 parts by weight of Na2O, 9.0-13.5 weight portions of F‑2.2 to 2.92 parts by weight of B2O30.2 to 0.8 part by weight of Li2O and 4.5-6.5 parts by weight of C. After the covering slag absorbs the heavy metal oxides in the molten steel, the slag denaturation is small, the slag consumption is stable and uniform, the lubricating and heat transfer effects of the super wear-resistant steel are fully reflected in the blank drawing process, the accident risk of producing the super wear-resistant steel by continuous casting slabs is obviously reduced, and the production cost is reduced.
Description
Technical Field
The invention relates to the technical field of steelmaking auxiliary materials, in particular to protective slag of a continuous casting crystallizer for super wear-resistant steel, a preparation method and application.
Background
The super wear-resistant steel is characterized in that on the basis of the conventional wear-resistant steel, a certain amount of Cr, Mo, Ni, Ti and Mn is added, so that the steel has ultrahigh strength and yield and a compact and fine microcrystalline structure, and the mechanical property of the super wear-resistant steel is 10 times to 20 times that of the conventional wear-resistant steel plate; the abrasion resistance of the related parts of the machine can be obviously improved; therefore, the service life of the machine is prolonged, and the production cost is reduced. The surface hardness of the product is generally 450-700 HB. The steel plate is applicable to processing and manufacturing wear-resistant wearing parts for mines and various engineering machinery.
The super wear-resistant steel can meet various performance requirements of modern industry on wear-resistant and vulnerable steel plates. However, the casting process suffers from very headache, firstly, heavy metal oxide enters into the casting powder slag to cause serious modification of the casting powder, which affects smooth continuous casting, and secondly, the casting blank surface has the defects of cracks and slag channel scabbing due to poor lubricating conditions. The research of the industry on the problem of slag denaturation of the covering slag mainly focuses on the influence of aluminum oxide and manganese oxide of conventional carbon steel on the performance of the covering slag, and the comprehensive research on chromium oxide, molybdenum oxide, nickel oxide, manganese oxide and titanium oxide on super wear-resistant steel is very limited. In recent years, the problems of casting blank scrapping or repairing caused by the defects of surface cracks, slag ditches and scabs of the casting blank exist in China and abroad in the production of the super wear-resistant steel.
Therefore, in order to meet the requirement of casting of super wear-resistant steel, how the casting powder has good lubricating and heat transfer effects under the condition of changeability, and the effective improvement of the continuous casting smooth degree and the casting blank quality becomes urgent.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the casting powder for the continuous casting crystallizer of the super wear-resistant steel, the preparation method and the application.
The invention is realized by the following steps:
in a first aspect, an embodiment of the present invention provides a mold flux for a continuous casting crystallizer of super wear-resistant steel, which comprises the following chemical components in parts by weight: 30-35 parts of CaO and 25-30 parts of SiO20.5-2.5 parts by weight of MgO and 0.0-2.0 parts by weight of Al2O30.0 to 2.0 parts by weight of Fe2O37.0-10.0 parts by weight of Na2O, 9.0-13.5 weight portions of F-2.2 to 2.92 parts by weight of B2O30.2 to 0.8 part by weight of Li2O and 4.5-6.5 parts by weight of C.
The embodiment of the invention provides a continuous casting crystallizer casting powder of super wear-resistant steel, which is prepared by setting a casting powder containing a proper amount of Li2O、Na2O、B2O3、F-To meet the adaptability requirement of the super wear-resistant steel plate to the continuous casting crystallizer casting powder, and a proper amount of Li2O、Na2O、B2O3、F-The slag can keep lower melting temperature and viscosity, and is beneficial to absorbing the inclusions. The casting powder has stable heat flow, melting point, viscosity and crystallization performance, thereby meeting the requirements of the super wear-resistant steel on the casting powder.
Therefore, the covering slag has strong absorption capacity on the oxide inclusions of Cr, Mo, Ni, Ti and Mn metal elements contained in the super wear-resistant steel, can keep the melting temperature and viscosity of the slag to be lower, is favorable for absorbing the inclusions, has a certain effect of stabilizing heat flow, effectively prevents the slag from being denatured, ensures uniform melting of the covering slag, proper thickness of a liquid slag layer and moderate consumption of the liquid slag, can ensure good lubricating heat transfer effect, and effectively improves the smooth continuous casting.
Alternatively, CaO may be in an amount of 30, 31, 32, 33, 34, or 35, or 30.5, 31.5, 32.5, 33.5, or 34.5, or any amount within the range of 30 to 35.
SiO2May be 25, 26, 27, 28, 29 or 30, may be 25.5, 26.5, 27.5, 28.5 or 29.5, and may be any value within the range of 25 to 30.
MgO may be contained in an amount of 0.5, 1.0, 1.5, 0.5, 1.2, 1.8, or any amount within the range of 0.5 to 2.0.
Al2O3May be 0.51.0, 1.5, 0.3, 1.2, 1.8, and any weight in the range of 0.0 to 2.0.
Fe2O3The amount may be 1.0, 2.0, 0.5, 1.5, 1.8, or any amount within the range of 0.0 to 2.0.
Na2O may be present in an amount of 7.0, 8.0, 9.0, 10.0, 7.5, 8.5, 9.5, or any amount within the range of 7.0 to 10.0.
F-The amount may be 9.0, 10.0, 11.0, 12.0, 13.0, 9.5, 10.5, 11.5, 12.5, 13.5, or any amount within the range of 9.0 to 13.5.
B2O3The amount may be 2.2, 2.5, 2.7, 2.9, 2.3, 2.4, 2.6, 2.8, or any amount within the range of 2.2 to 2.92.
Li2O may be 0.2, 0.4, 0.6, 0.8, 0.3, 0.5, 0.7, or any value within the range of 0.2 to 0.8.
C may be 5.0, 6.0, 4.5, 5.5, 6.5, or any value within the range of 4.5 to 6.5.
Li is added into the continuous casting crystallizer casting powder of the super wear-resistant steel provided by the embodiment of the invention2O、Na2O、B2O3、F-The content of the (B) is beneficial to keeping the lower melting temperature and viscosity of the slag, is beneficial to absorbing inclusions, and plays a role in stabilizing the heat flow, melting point, viscosity and crystallization property of the casting powder to a certain extent, thereby meeting the requirement of the super wear-resistant steel on the casting powder.
It is worth mentioning that:
the content of the alumina is reduced as much as possible, and the combination of heavy metal oxide and amphoteric alumina with high melting point is reduced as much as possible to form a complex high-melting-point substance;
of importanceThe casting powder of the continuous casting crystallizer of the super wear-resistant steel contains higher B2O3Lower Li2O, the main purpose of which is that B and Li are respectively the most active nonmetal element and metal element, which both have the most active characteristic, the melting points of the oxides of the two are lower, and the oxides are combined with heavy metal oxides in a molten state of slag to generate a molecular structure substance with a lower melting point, so that the capacity of containing inclusions is improved; 2.2-2.92 parts by weight of B2O3Corresponding borax (Na)2B4O7·10H2O) 6 to 8, 0.2 to 0.8 parts by weight of Li2Lithium carbonate (Li) corresponding to O2CO3) 0.59-2.3 parts by weight.
Selecting cheap borax (Na) with the price of 3000-2B4O7·10H2O) ratio of 6-8 percent to replace the expensive lithium carbonate which has the price of 50000-170000 yuan/ton all the time in recent years, thereby achieving good cost reduction benefit;
according to the characteristic that borax is dissolved in water, in the production process of the protective slag, excessive borax cannot be dissolved due to the influence of different solubilities of the conventional 50% concentration slurry at the temperature of 25-40 ℃, the borax can be dissolved within 8.9% generally, and the moisture in the slurry is naturally lost in the drying process of high-pressure spraying at the temperature of 500-700 ℃, so that the spray granulation is not influenced; and when the borax exceeding the borax dissolution amount is in a drying state of slurry high-pressure spraying at the temperature of 500-700 ℃, crystal water is quickly gasified and expanded after particle forming, so that the formed better protective slag particles are crushed, the generated ash content is large, the granulation rate is low, and the melting stability and the heat preservation effect of the protective slag in the using process are poor. Therefore, the conventional casting powder is rarely added with boron element oxide, and even if the conventional casting powder is selected, borax and other materials are sintered or melted firstly, so that crystal water is lost to form a new substance, and the production cost is increased; the following table 1 is presented according to borax solubility:
TABLE 1 Borax solubility
The proportion of the selected borax is 6-8%, and mainly the binding agent in the casting powder slurry plays a role in best binding of various material particles at 25-40 ℃, the temperature of the slurry is too low or too high, the binding effect of the binding agent is poor, the effect of spraying and drying the slurry into particles at high pressure and high temperature is poor, the ash content is large, the normal and orderly production of the casting powder cannot be ensured, the advantage of lowest cost cannot be achieved, and meanwhile, the heat preservation effect and stable melting effect of the casting powder in use are influenced due to the low particle rate of the casting powder.
In an alternative embodiment, the binary basicity of the mold flux (i.e., CaO/SiO)2The ratio of the weight parts) is 1.0-1.2, and the liquid slag has small denaturation after absorbing the heavy metal oxide slag inclusion while ensuring good lubricating and heat transfer effects.
In an optional embodiment, the melting temperature of the casting powder is 1030-1100 ℃, the melting point of the general wear-resistant steel slag is basically 1100-1200 ℃, which mainly considers that the conventional wear-resistant steel is mainly a manganese-containing alloy steel type and does not contain or contains less than 0.05% of elements such as Cr, Mo, Ni, Ti and the like, and the super wear-resistant steel slag provided by the invention reduces the melting temperature as much as possible while ensuring the thickness of a proper liquid slag layer, so that after absorbing high-melting-point slag inclusion substances such as chromium oxide, molybdenum oxide, nickel oxide, manganese oxide, titanium oxide and the like, the slag film structure having the lubricating and heat-transferring effects on a casting blank cannot be greatly changed, and the good heat-transferring and lubricating effects on the casting blank are maintained.
In an alternative embodiment, the mold flux has a viscosity of 0.03 pas to 0.09 pas at 1300 ℃. The viscosity not only influences the consumption of the slag, but also is beneficial to improving the capacity of absorbing inclusions with high melting points, and after slag inclusion substances enter the slag, the slag with low viscosity can be well contacted with the particles and mutually invaded and melted into good molten state, thereby avoiding the phenomenon that once a high melting point substance forms a crystal nucleus, the high melting point substance is quickly crystallized, the fluidity of the slag is deteriorated, and the lubricating performance of a casting blank and the performance of transferring heat to the outside are influenced. Therefore, the viscosity of the mold flux is designed to be 0.03 pas to 0.09 pas, because the viscosity is low.
In a second aspect, an embodiment of the present invention provides a method for preparing a mold flux for a continuous casting crystallizer of super wear-resistant steel, including the following steps: the preparation raw materials of the casting powder are mixed according to the proportion to prepare slurry, and the casting powder of the continuous casting crystallizer for the super wear-resistant steel is prepared by spray granulation.
The embodiment of the invention provides a preparation method of continuous casting crystallizer casting powder of super wear-resistant steel, which comprises the following steps: weighing the materials according to the weight parts, adding water into a mixing tank for pulping, spraying and granulating by a high-pressure pump high-temperature tower, screening by a vibrating screen, and packaging qualified products.
In an alternative embodiment, the raw materials for preparing the crystallizer protection slag special for the super wear-resistant steel plate comprise: fluorite, white alkali, carbon materials, sodium fluosilicate, wollastonite, lithium carbonate, borax, calcite, magnesite, cryolite and adhesives. Wherein, the binder can be the common binder in the preparation process of the covering slag, such as sodium carboxymethyl cellulose, starch and the like.
In alternative embodiments, the carbonaceous material includes imported carbon black and domestic carbon black.
In an alternative embodiment, the imported carbon black has a particle size of 8 to 20nm and the domestic carbon black has a particle size of 20 to 80 nm.
In an alternative embodiment, the carbonaceous material further comprises graphite.
In an alternative embodiment, the carbonaceous material comprises: 0.5 to 0.1 percent of imported carbon black, 0.5 to 1 percent of domestic carbon black and 4 to 6 percent of earthy graphite.
The preparation raw materials of the crystallizer covering slag special for the super wear-resistant steel plate provided by the embodiment of the invention comprise: the carbon material can comprise imported carbon black, domestic carbon black and earthy graphite, the carbon is an important substance for controlling the melting speed and the slag layer structure, wherein the influence of the carbon black is the largest, the imported carbon black with the particle size of 8-20nm is particularly obvious, and the domestic carbon black with the particle size of 20-80nm can be matched, so that the imported carbon black accounting for 0.5-0.1% of the total mass of the preparation raw materials and the domestic carbon black accounting for 0.5-1% of the total mass of the preparation raw materials are adopted, and the earthy graphite accounting for 4-6% of the total mass of the preparation raw materials is introduced, so that the good three-layer structure and the melting uniformity are fully ensured.
In a third aspect, the embodiment of the invention also provides an application of the continuous casting mold flux of the super wear-resistant steel in preparing the super wear-resistant steel.
The invention has the following beneficial effects:
the invention provides a protective slag of a continuous casting crystallizer for super wear-resistant steel, a preparation method and application. By setting up an appropriate amount of Li2O、Na2O、B2O3And F-The casting powder solvent can keep the melting temperature and viscosity of the slag low, is beneficial to absorbing high-melting point oxides formed by heavy metal elements such as Cr, Mo, Ni, Ti, Mn and the like, utilizes the characteristics of eutectic formed by the low-melting point oxides and the high-melting point oxides in the slag theory in the state of the slag, but the content of the solvents needs to be controlled within a certain range, otherwise substances such as nepheline, gunite and the like are easily separated out, and the capacity of absorbing impurities of the casting powder is reduced. The relatively more cosolvent is effectively diluted and digested the slag denaturation, the good lubricating and heat transfer effects can be ensured, the continuous casting smoothness is effectively improved, the casting blank quality is improved, the procedure of cleaning the surface slag inclusion of the continuous casting blank is obviously reduced, and the cost is reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The casting powder for the continuous casting crystallizer of the super wear-resistant steel comprises 18.0 wt%, 12.0 wt%, 0.5 wt%, 1.0 wt%, 6.0 wt%, 2.0 wt%, 49.0 wt%, 2.0 wt%, 0.5 wt%, 6.0 wt%, 2.0 wt%, 2.5 wt%, 6.0 wt%, 2.0 wt% and 1.0 wt% of fluorite, white alkali, imported carbon black, domestic carbon black, earthy graphite, sodium fluosilicate, wollastonite, argil, lithium carbonate, borax, cryolite, adhesive, water reducing agent and dispersant.
The chemical components of the covering slag comprise 32.34 percent of CaO and SiO228.09％、MgO 0.73％、Fe2O30.40％、Al2O30.95％、Na2O 9.75％、F-10.14％、Li2O 0.2％、B2O32.19％、C 6.％。
The physical index of the covering slag is binary alkalinity (CaO/SiO)2) 1.15, a melting temperature of 1040 ℃ and a viscosity of 0.06 pas at 1300 ℃.
The preparation method of the mold flux in the above embodiment 1 includes the following steps: metering according to the weight parts of the materials, adding water into a mixing tank for pulping, spraying and granulating by a high-pressure pump high-temperature tower, screening by a vibrating screen, and packaging qualified products.
The obtained continuous casting crystallizer casting powder of the super wear-resistant steel is tested in a certain domestic factory, the model number of the test slag is XLNM-1, the types of the test steel are NM460, NM500 and the like, and the section is 230 x 1650mm2The pulling speed is 0.8-1.1 m/min. And testing the mold flux for 3T. In the test process, the model of the casting powder has good spreadability and fluidity in the crystallizer, the thickness of a liquid slag layer is 8-15mm under the condition that the total slag layer is controlled to be 45-65mm, the three-layer structure is obvious, the thickness of the liquid slag layer is proper, the size of a liquid level flame of the crystallizer is proper, the average slag consumption is 0.35-0.55kg/T, the generation speed of slag strips in the crystallizer is slow, the surface of a cast blank produced by the test is free from defects, and later-stage steel rolling detection data show that the cast blank has no recarburization and slag inclusion defects, so that a good effect is achieved.
Example 2
The casting powder for continuous casting crystallizer of super wear-resistant steel comprises the following components of 20.0 wt%, 10.0 wt%, 0.5 wt%, 1.0 wt%, 5.0 wt%, 2.0 wt%, 44.5 wt%, 6.0 wt%, 1.0 wt%, 7.0 wt%, 2.0 wt% and 1.0 wt% of fluorite, white alkali, imported carbon black, domestic carbon black, soil-like graphite, sodium fluosilicate, wollastonite, pottery clay, lithium carbonate, borax, cryolite and adhesive.
The chemical compositions in percentage content of CaO 32.01 percent and SiO in the covering slag228.65％、MgO 0.74％、Fe2O30.51％、Al2O31.45％、Na2O 8.0％、F-11.2％、Li2O 0.41％、B2O32.55％、C5.4.％。
The physical index of the covering slag is binary alkalinity (CaO/SiO)2) 1.11, a melting temperature of 1065 ℃ and a viscosity of 0.04 pas at 1300 ℃.
Example 3
The casting powder for continuous casting crystallizer of super wear-resistant steel comprises the following components, by weight, 19.0%, 9.0%, 1.0%, 4.0%, 2.0%, 41.95%, 11.0%, 1.55%, 7.5%, 1.0% and 1.0% of fluorite, white alkali, imported carbon black, domestic carbon black, earthy graphite, sodium fluosilicate, wollastonite, argil, lithium carbonate, borax, cryolite and an adhesive.
The covering slag comprises the chemical components of CaO 31.23 percent and SiO229.4％、MgO 0.76％、Fe2O30.62％、Al2O31.92％、Na2O 7.56％、F-10.1％、Li2O 0.6％、B2O32.73％、C5.1.％。
The physical index of the covering slag is binary alkalinity (CaO/SiO)2) 1.06, a melting temperature of 1085 ℃ and a viscosity of 0.085 pas at 1300 ℃.
Example 4
The casting powder for continuous casting crystallizer of super wear-resistant steel comprises the following components of 24.5 wt%, 9.0 wt%, 1.0 wt%, 4.0 wt%, 2.0 wt%, 38.5 wt%, 8.0 wt%, 2.0 wt%, 8.0 wt%, 1.0 wt% and 1.0 wt% of fluorite, white alkali, imported carbon black, domestic carbon black, earthy graphite, sodium fluosilicate, wollastonite, argil, lithium carbonate, borax, cryolite and adhesive.
The covering slag comprises the chemical components of CaO 33.07 percent and SiO227.8％、MgO 0.71％、Fe2O30.55％、Al2O31.78％、Na2O 7.1％、F-12.59％、Li2O 0.8％、B2O32.92％、C5.0.％。
The physical index of the covering slag is binary alkalinity (CaO/SiO)2) 1.19, a melting temperature of 1095 ℃ and a viscosity of 0.03 pas at 1300 ℃.
The casting powder of the continuous casting crystallizer of the super wear-resistant steel obtained in the embodiments 1 to 4 can well meet the requirement of continuous casting, and the produced casting blank has no surface defect and well meets the requirements of casting and quality.
Comparative example 1
Comparative example 1 differs from example 1 in that: the binary alkalinity of the high-magnesium low-sodium continuous casting crystallizer casting powder of the steel for the automobile plate is 1.15, the melting temperature is 1050 ℃, and the viscosity is 0.12 Pa.S under the condition of 1300 ℃. In the use process of the casting blank in the crystallizer, liquid slag is seriously denatured, the thickness of a liquid slag layer is 18mm, the consumption is 0.21kg/t, the liquid slag layer is too thick, the consumption is too low, sufficient lubrication cannot be effectively ensured, the casting blank drawing resistance is too large, and the defect of serious cracks exists.
Comparative example 2
Comparative example 2 differs from example 2 in that: the binary alkalinity of the high-magnesium low-sodium continuous casting crystallizer casting powder of the steel for the automobile plate is 1.05, the melting temperature is 1140 ℃, and the viscosity is 0.10 Pa.S under the condition of 1300 ℃. When the casting blank is used in a crystallizer, the thickness of a liquid slag layer is 16mm, the consumption is 0.30kg/t, the liquid slag layer is thicker, the consumption is improved, but the consumption is still slightly lower, the lubricating effect is poor, the sufficient lubrication cannot be effectively ensured, and the surface of the produced casting blank has not only cracks but also depression defects.
Comparative example 3
Comparative example 3 differs from the mold flux of example 1 in that only Na is contained2O、F-Does not contain Li2O、B2O3. After the covering slag is only drawn for half an hour in the use process of the covering slag in the crystallizer, the slag in the crystallizer is seriously denatured, a large number of slag strips appear, the slag strips need not to be picked continuously, if the slag strips are not picked, production alarm is frequent, normal steel pouring is influenced, and even steel leakage production accidents occur in serious cases, so that production interruption is caused.
Comparative example 4
Comparative example 4 is different from the mold flux in example 1 in that: b is2O3Is more than 2.92 percent. Due to B2O3The content is higher than the maximum value defined in the invention, although the temperature of the slurry is increased by 40 ℃ higher than that of the slurry provided in the embodiment of the invention through various ways to achieve the purpose of increasing borax (Na)2B4O7·10H2O), the purpose of solubility is achieved, but the sodium borate particles in the spray granulated casting powder have strong water absorption and can easily absorb water vapor in the air, so that the casting powder particles absorb water vapor to get damp and have high particle pulverization rate, and the packaging is not timely or not good particularly in rainy days, so that the product is often sent to a client to be inspected to reject due to poor granularity and large ash content; meanwhile, due to the fact that ash content is large, the casting powder is added into the crystallizer, the environment is polluted, and in the process of melting the casting powder, due to the fact that the ash content is large, air permeability is poor, melting and consumption of the casting powder are affected, and therefore lubricating casting blanks are poor, and casting blank surface slag pits and cracks are large.
Comparative example 5
Comparative example 5 differs from the mold flux in example 1 in that: only one or two of the carbonaceous materials are selected. If only carbon black is selected, the carbon in the carbon black has lower oxidation point, the carbon is quickly oxidized, the casting powder is quickly melted, a sintered layer of the casting powder is thickened, the slag strips grow quickly, the consumption of the casting powder is influenced, and the quality of a casting blank is poor; if only earthy graphite is selected, the carbon oxidation point is high, the melting of the casting powder is slow, and the liquid slag cannot meet the lubricating requirement of the casting blank, so that the bonding and steel leakage of the casting blank are easily caused; if domestic carbon black and earthy graphite are selected, as the domestic carbon black particles have small particle size without imported carbon black, the wrapping performance of the carbon particles on material particles is poor, the instability of melting of the casting powder is reflected in the long-time steel casting process, the slag surface agglomeration is serious, and the normal melting and consumption of the casting powder are influenced; if only the imported carbon black and the earthy graphite are selected, the carbon of the imported carbon black ultrafine particles and the earthy graphite coarse particles are poor in carbon oxidation synchronism due to the lack of particle support of the carbon black with the coarse particle size, and after the protective slag is used for a period of time, the slag surface is seriously agglomerated, so that the long-time stable steel casting production is not facilitated.
As can be seen from the above examples and comparative examples: compared with the continuous casting mold powder of the super wear-resistant steel in the comparative example, the continuous casting mold powder of the super wear-resistant steel provided by the embodiment of the application has better performances, and the continuous casting mold powder of more super wear-resistant steels provided by the embodiment of the application can effectively prevent slag from being denatured, can ensure a good lubricating and heat transfer effect, and effectively improves the continuous casting smooth degree and the casting blank quality.
To sum up, the embodiment of the invention provides a super wear-resistant steel continuous casting crystallizer casting powder, a preparation method and application thereof, wherein the super wear-resistant steel continuous casting crystallizer casting powder comprises the following chemical components in parts by weight: 30-35 parts of CaO and 25-30 parts of SiO20.5-2.5 parts by weight of MgO and 0.0-2.0 parts by weight of Al2O30.0 to 2.0 parts by weight of Fe2O37.0-10.0 parts by weight of Na2O, 9.0-13.5 weight portions of F-2.2 to 2.92 parts by weight of B2O30.2 to 0.8 part by weight of Li2O and 4.5-6.5 parts by weight of C. After the covering slag absorbs the heavy metal oxides in the molten steel, the slag denaturation is small, the slag consumption is stable and uniform, the lubricating and heat transfer effects of the super wear-resistant steel are fully reflected in the blank drawing process, the accident risk of producing the super wear-resistant steel by continuous casting slabs is obviously reduced, and the production cost is reduced.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The casting powder for the continuous casting crystallizer of the super wear-resistant steel is characterized by comprising the following chemical components in parts by weight: 30-35 parts of CaO and 25-30 parts of SiO20.5-2.5 parts by weight of MgO and 0.0-2.0 parts by weight of Al2O30.0 to 2.0 parts by weight of Fe2O37.0-10.0 parts by weight of Na2O、90-13.5 parts by weight of F-2.2 to 2.92 parts by weight of B2O30.2 to 0.8 part by weight of Li2O and 4.5-6.5 parts by weight of C.
2. The super wear-resistant steel mold flux for continuous casting of steel according to claim 1, wherein the binary basicity of said mold flux is 1.0-1.2.
3. The super wear-resistant steel mold flux for continuous casting of steel according to claim 1, wherein the mold flux has a melting temperature of 1030 ℃ to 1100 ℃.
4. The super wear-resistant steel mold flux for continuous casting of steel according to claim 1, wherein the mold flux has a viscosity of 0.03 Pa-s to 0.09 Pa-s at 1300 ℃.
5. A method for preparing the continuous casting crystallizer covering slag of the super wear-resistant steel according to any one of the claims 1 to 4, which is characterized by comprising the following steps: and mixing the preparation raw materials of the covering slag according to the proportion to prepare slurry, and performing spray granulation to obtain the continuous casting crystallizer covering slag of the super wear-resistant steel.
6. The method according to claim 5, wherein the raw materials for preparing the mold flux comprise: fluorite, white alkali, carbon materials, sodium fluosilicate, wollastonite, lithium carbonate, borax, calcite, magnesite, cryolite and adhesives.
7. The method of claim 6, wherein the carbon material comprises imported carbon black and domestic carbon black;
preferably, the particle size of the imported carbon black is 8-20nm, and the particle size of the domestic carbon black is 20-80 nm.
8. The method of claim 7 wherein the carbonaceous material further comprises graphite.
9. The method of claim 6, wherein the carbonaceous material comprises: 0.5 to 0.1 percent of imported carbon black, 0.5 to 1 percent of domestic carbon black and 4 to 6 percent of earthy graphite.
10. Use of the super wear-resistant steel mold powder according to any one of claims 1 to 4 or the super wear-resistant steel mold powder produced by the production method according to any one of claims 5 to 9 for producing super wear-resistant steel.
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