CN114210940B - Continuous casting crystallizer casting powder for YQ450NQR1 high-strength high-weather-resistance steel and application thereof - Google Patents
Continuous casting crystallizer casting powder for YQ450NQR1 high-strength high-weather-resistance steel and application thereof Download PDFInfo
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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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
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Abstract
The invention discloses continuous casting crystallizer casting powder for YQ450NQR1 high-strength high-weather-resistance steel and application thereof, and belongs to the technical field of metallurgical auxiliary materials. In weight percentage, na in the chemical components of the protective slag + 、Li + 、F ‑ And B 2 O 3 The total amount of the powder is 13-17%, so that the melting point of the protecting slag reaches 1180-1195 ℃ and the viscosity reaches 0.93-0.97 Pa.s. The melting point can improve the crystallization temperature of the mold flux, so that the heat transfer rate of the mold flux is controlled, and cracks on the surface of the blank shell caused by the excessively high heat transfer rate are avoided; the viscosity can avoid the phenomenon of bonding steel leakage caused by overlarge viscosity, and can also avoid the phenomenon of uneven thickness of slag film caused by overlarge viscosity, which is easy to generate cracks on the surface of a casting blank. The casting powder is suitable for continuous casting production of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel at a pulling speed of 0.7-0.9m/min, and can ensure that the steel is continuous and smooth, and the surface defects of a casting blank are less.
Description
Technical Field
The invention relates to the technical field of metallurgical auxiliary materials, in particular to continuous casting crystallizer casting powder for YQ450NQR1 high-strength and high-weather-resistance steel and application thereof.
Background
Along with the driving of economic development of China to railway transportation, the railway steel is continuously developed, and YQ450NQR1 high-strength high-weather-resistance steel B is used as an important variety of railway steel, has the performance characteristics of high strength, corrosion resistance and the like, is special section steel for manufacturing a middle beam of a train carriage, and is an important guarantee for train heavy load. From the appearance, the B-shaped steel belongs to a large-scale asymmetric section bar, and has the advantages that the section shape is simple, but the upper leg and the lower leg are different in length and thickness, serious uneven deformation exists in the rolling process, the rolled piece has a tendency of bending in the direction of the short leg, meanwhile, the rolled piece has a tendency of twisting relative to the longitudinal axis of the rolled piece, the rolling precision is difficult to control, and the extremely high requirement is further provided for a casting blank quality control window by increasing the rolling difficulty.
YQ450NQR1 high strength and weather resistant steel is typically subject to the following problems during casting: when molten steel is solidified by peritectic reaction, a primary solidified blank shell is formed by rapid cooling in a crystallizer, high-temperature ferrite is transformed into austenite in the process, the high-temperature ferrite has 3.5-4.0% of volume shrinkage, more importantly, the high-temperature ferrite is 0.5-1.0% smaller than austenite, the process of transforming delta-Fe ferrite into gamma-Fe austenite at high temperature is represented by sudden change of volume shrinkage, the primary blank shell in the crystallizer breaks away from a copper plate of the crystallizer to form an air gap, so that heat transfer is slowed down, the primary blank shell is thinner, and cracks on the surface of a casting blank are easily caused under the static pressure of molten steel, therefore, the quality control of the YQ450NQR 1B steel blank shell is a key link of B steel production.
At present, a great number of students develop a great deal of research work on the steel B, but the research is mainly focused on the rolling of the steel B, the mechanical property of the steel B and the analysis and control of the cracking defect of the steel B, and the research on crystallizer casting powder related to the quality control of the continuous casting shell of the steel B of YQ450NQR1 is basically not seen.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide the casting mold flux for the YQ450NQR1 high-strength and high-weather-resistant steel B, which can ensure that the billet shell of the YQ450NQR1 steel B is always kept at a better quality in the continuous casting process, and ensure the smooth running of the YQ450NQR1 high-strength and high-weather-resistant steel B continuous casting process.
The second purpose of the invention is to provide an application of the casting powder of the continuous casting crystallizer for YQ450NQR1 high-strength and high-weather-resistant B-shaped steel, namely, the casting powder is used for continuous casting production of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel under the condition of the pulling speed of 0.7-0.9m/min.
The application can be realized as follows:
in a first aspect, the present application provides a continuous casting mold flux for YQ450NQR1 high-strength and high-weather-resistant steel, wherein the flux comprises the following chemical components in percentage by weight + 、Li + 、F - And B 2 O 3 The total amount of the powder is 13-17%, the melting point of the covering slag is 1180-1195 ℃, and the viscosity is 0.93-0.97 Pa.s.
In a preferred embodiment, the chemical composition of the mold flux includes 25-28% CaO, 26.3-31.76% SiO 2 4-6% MgO, 2-6% Al 2 O 3 0.2-2% Fe 2 O 3 8-13% Na 2 O, 4-6% F - 1.5 to 2.5 percent of B 2 O 3 0.4-1.2% Li 2 O and 8-10% of C, and the balance of unavoidable impurities and loss on ignition.
In an alternative embodiment, the binary basicity of the above-mentioned mold flux is 0.85 to 0.95.
In an alternative embodiment, the raw materials for preparing the covering slag comprise glass powder, fluorite, white alkali, lithium carbonate, borax, a carbonaceous material, premelted material, wollastonite, limestone, magnesia and a binder;
in an alternative embodiment, the carbonaceous material includes carbon black and graphite.
In an alternative embodiment, the carbon content of the carbon black is greater than or equal to 98 percent, and the oil absorption value is greater than 100g/cm 3 The iodine absorption value is more than 130g/kg; the carbon content of graphite is more than or equal to 90 percent, and the oil absorption value is more than 35g/cm 3 The iodine absorption value is more than 55g/kg.
In an alternative embodiment, the above-described raw materials for preparation include, by weight, 3-11 parts of glass frit, 6-8 parts of fluorite, 13-16.7 parts of white alkali, 1-3 parts of lithium carbonate, 2.5-4 parts of borax, 1-3 parts of carbon black, 6.5-9.0 parts of graphite, 10-40 parts of premelted material, 20-42 parts of wollastonite, 2-10 parts of limestone, 4-6 parts of magnesia, and 0.8-2.0 parts of a binder.
In an alternative embodiment, the binder includes at least one of dextrin, starch, and carboxymethyl cellulose.
In a second aspect, the present application provides the use of a continuous casting mold flux for YQ450NQR1 high strength, high weather resistant b steel according to any of the foregoing embodiments, for example, for continuous casting production of YQ450NQR1 high strength, high weather resistant b steel at a draw rate of 0.7 to 0.9m/min.
The beneficial effects of this application include:
by bringing Na into contact with + 、Li + 、F - And B 2 O 3 The total amount of the protective slag is controlled to be 13-17%, the melting point of the protective slag can be effectively regulated to 1180-1195 ℃ and the viscosity of the protective slag can reach 0.93-0.97 Pa.s, the melting point can improve the crystallization temperature of the protective slag, the heat transfer rate of the protective slag is controlled, the lubricating heat transfer effect is good, and cracks on the surface of a blank shell caused by the over-fast heat transfer rate are avoided; the viscosity range can avoid the phenomenon of bonding steel leakage caused by overlarge viscosity, and can also avoid the phenomenon of uneven thickness of slag film caused by overlarge viscosity, which leads to easy generation of cracks on the surface of casting blank.
The casting powder is suitable for continuous casting production of YQ450NQR1 high-strength and high-weather-resistant steel with the drawing speed of 0.7-0.9m/min, can improve the quality of casting blanks, reduce the surface defects of the casting blanks, ensure that the YQ450NQR1 steel blank shell always maintains better quality in the continuous casting process, ensure the continuous casting of the steel grade to be smooth, and reduce the production cost.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The continuous casting mold flux for YQ450NQR1 high-strength and high-weather-resistant steel B provided by the application and the application thereof are specifically described below.
The application provides a continuous casting crystallizer casting powder for YQ450NQR1 high-strength and high-weather-resistant steel B, wherein the casting powder comprises the following chemical components in percentage by weight + 、Li + 、F - And B 2 O 3 The total amount of the powder is 13-17%, the melting point of the covering slag is 1180-1195 ℃, and the viscosity is 0.93-0.97 Pa.s.
Wherein Na is + 、Li + 、F - And B 2 O 3 The total amount of (C) may be 13%, 13.2%, 13.5%, 13.8%, 14%, 14.2%, 14.5%, 14.8%, 15%, 15.2%, 15.5%, 15.8% or 16%, 16.2%, 16.5%, 16.8% or 17%, etc., and may be any other value within the range of 13 to 17%.
The melting point of the mold flux may be 1180 ℃, 1182 ℃, 1185 ℃, 1188 ℃, 1190 ℃, 1192 ℃, 1195 ℃ or the like, or any other value within the range of 1180-1195 ℃.
The viscosity may be 0.93 pas, 0.94 pas, 0.95 pas, 0.96 pas, 0.97 pas, or the like, or any other value within the range of 0.93 to 0.97 pas.
In the covering slag provided by the application, na + 、Li + 、F - And B 2 O 3 The total amount of (2) plays a key role in the melting point and viscosity of the mold flux. By mixing Na in the protective slag + 、Li + 、F - And B 2 O 3 The total amount of the protective slag is controlled to be 13-17%, the melting point of the protective slag can reach 1180-1195 ℃ and the viscosity of the protective slag reaches 0.93-0.97 Pa.s, the melting point can improve the crystallization temperature of the protective slag, the heat transfer rate of the protective slag is controlled, the lubricating heat transfer effect is good, and cracks on the surface of a blank shell caused by the over-fast heat transfer rate are avoided; the viscosity can avoid the phenomenon of bonding steel leakage caused by overlarge viscosity, and also can avoid the phenomenon of uneven thickness of slag film caused by overlarge viscosity, which leads to easy generation of cracks on the surface of casting blank.
Na + 、Li + 、F - And B 2 O 3 The total amount of the slag is lower than 13%, the melting point of the slag is high, the surface tension is increased, the viscosity is increased, the slag flow and lubrication are not facilitated, and the phenomenon of steel sticking and steel leakage is easy to occur; above 17%, the melting point of the liquid slag is low, the surface Zhang Libian is small, the fluidity of the liquid slag is too strong, the liquid slag filling between the blank shell and the inner wall of the crystallizer is uneven, the casting blank is uneven, and cracks are easy to generate.
In some preferred embodiments, the chemical composition of the mold flux includes 25-28% CaO, 26.3-31.76% SiO 2 4-6% MgO, 2-6% Al 2 O 3 0.2-2% Fe 2 O 3 8-13% Na 2 O, 4-6% F - 1.5 to 2.5 percent of B 2 O 3 0.4-1.2% Li 2 O and 8-10% C, the balance being unavoidableImpurity and loss on ignition.
The CaO content may be 25%, 25.5%, 26%, 26.5%, 27%, 27.5% or 28%, etc., or may be any other value within the range of 25 to 28%.
SiO 2 The content of (2) may be 26.3%, 26.5%, 27%, 27.5%, 28%, 28.5%, 29%, 29.5%, 30%, 31% or 31.76%, etc., or may be any other value within the range of 26.3 to 31.76%.
The MgO content may be 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8% or 6%, etc., or any other value within the range of 4 to 6%.
Al 2 O 3 The content of (2) may be 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5% or 6%, etc., and may be any other value within the range of 2 to 6%.
Fe 2 O 3 The content of (2) may be 0.2%, 0.5%, 0.8%, 1%, 1.2%, 1.5%, 1.8% or 2%, etc., or may be any other value within the range of 0.2 to 2%.
Na 2 The content of O may be 8%, 8.5%, 9%, 9.5%, 10%, 11%, 12% or 13%, etc., or any other value within the range of 8 to 13%.
F - The content of (2) may be 4%, 4.2%, 4.5%, 4.8%, 5%, 5.2%, 5.5%, 5.8% or 6%, etc., or may be any other value within the range of 4 to 6%.
B 2 O 3 The content of (2) may be 1.5%, 1.8%, 2%, 2.2% or 2.5%, etc., or may be any other value within the range of 1.5 to 2.5%.
Li 2 The content of O may be 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1% or 1.2%, etc., or may be any other value within the range of 0.4 to 1.2%.
The content of C may be 8%, 8.2%, 8.5%, 8.8%, 9%, 9.2%, 9.5%, 9.8% or 10%, etc., or may be any other value within the range of 8 to 10%.
The above-mentioned mold flux has a binary basicity of 0.85-0.95, such as 0.85, 0.88, 0.90, 0.92 or 0.95, etc., and may have any other binary basicity value within the range of 0.85-0.95.
It should be noted that, instead of the binary alkalinity and viscosity of the covering slag meeting the range provided by the application, continuous casting of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel can be smooth under the condition that the drawing speed is 0.7-0.9m/min, at least the melting point and viscosity range provided by the application are simultaneously met, so that continuous casting of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel can be smooth under the condition that the drawing speed is 0.7-0.9m/min, preferably, the covering slag simultaneously meets the melting point, viscosity and binary alkalinity range provided by the application, and better casting blank quality and continuous casting effect can be obtained.
The preparation raw materials of the covering slag provided by the application comprise glass powder, fluorite, white alkali, lithium carbonate, borax, a carbonaceous material, premelting material, wollastonite, limestone, magnesia and an adhesive.
In an alternative embodiment, the above-described preparation raw materials may include, in parts by weight, 3 to 11 parts of glass frit, 6 to 8 parts of fluorite, 13 to 16.7 parts of white alkali, 1 to 3 parts of lithium carbonate, 2.5 to 4 parts of borax, 1 to 3 parts of carbon black, 6.5 to 9.0 parts of graphite, 10 to 40 parts of premelt, 20 to 42 parts of wollastonite, 2 to 10 parts of limestone, 4 to 6 parts of magnesia, and 0.8 to 2.0 parts of a binder.
The amount of the glass frit may be 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, or the like, or any number in the range of 3 to 11 parts.
The amount of fluorite may be 6 parts, 6.5 parts, 7 parts, 7.5 parts or 8 parts, etc., or may be any number in the range of 6 to 8 parts.
The amount of the white alkali may be 13 parts, 13.5 parts, 14 parts, 14.5 parts, 15 parts, 15.5 parts, 16 parts, 16.7 parts, or the like, or may be any number in the range of 13 to 16.7 parts.
The amount of lithium carbonate and carbon black may be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, or the like, independently, or may be any number in the range of 1 to 3 parts.
The borax may be used in an amount of 2.5 parts, 3 parts, 3.5 parts, 4 parts, etc., or may be used in any amount ranging from 2.5 to 4 parts.
The amount of graphite may be 6.5 parts, 7 parts, 7.5 parts, 8 parts, 8.5 parts, 9 parts, or the like, or may be any number in the range of 6.5 to 9.0 parts.
The amount of the premelt may be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, or the like, or may be any number in the range of 10 to 40 parts.
The wollastonite may be used in an amount of 20 parts, 25 parts, 20 parts, 30 parts, 35 parts, 40 parts or 42 parts, or any number in the range of 20 to 42 parts.
The amount of limestone may be 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc., or may be any number in the range of 2 to 10 parts.
The amount of the magnesia may be 4 parts, 4.5 parts, 5 parts, 5.5 parts or 6 parts, etc., and may be any number in the range of 4 to 6 parts.
The amount of the binder may be 0.8 part, 1 part, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, or the like, or may be any number in the range of 0.8 to 2.0 parts.
The carbonaceous material includes carbon black and graphite. Wherein the carbon content of the carbon black is more than or equal to 98 percent, and the oil absorption value is more than 100g/cm 3 The iodine absorption value is more than 130g/kg; the carbon content of graphite is more than or equal to 90 percent, and the oil absorption value is more than 35g/cm 3 The iodine absorption value is more than 55g/kg.
In the present application, carbon black is used in combination with graphite as a carbonaceous material.
The binder may include, for example, at least one of dextrin, starch, and carboxymethyl cellulose.
The reason why the amount of the binder is controlled to be 0.8 to 2.0 parts in the present application is mainly that: if the binder is less than 0.8 part, when the covering slag is sprayed, granulated and dried, the hollow particles of the covering slag are low in yield due to poor adhesion of particles in the slurry; and when the content of the water is higher than 2.0 parts, the adhesion of the particles is high, the hollow particles are large and compact, the rapid volatilization of the water in the center of the particles is not facilitated, and the water index required by the product is unqualified.
The premelt material is prepared by conventional materials in the art, and is not described in detail herein.
Correspondingly, the application also provides a preparation method of the continuous casting crystallizer casting powder for YQ450NQR1 high-strength and high-weather-resistant steel, which comprises the following steps: firstly, grinding glass powder, fluorite, limestone, magnesia, premelt and wollastonite into powder for standby. Adding the adhesive into a mixing tank filled with water according to the proportion, sequentially adding carbonaceous materials (carbon black and graphite), chemical materials (white alkali, borax and lithium carbonate), ground adjustment materials (glass powder, fluorite, limestone and magnesia) and ground base materials (premelting material and wollastonite), pulping and mixing for 50-70min to obtain the slurry. Pumping the slurry into a high Wen Dana spray granulation machine with the temperature of 500-600 ℃, sieving by a 80-mesh sieve vibrating screen, and packaging qualified products.
In addition, the application of the continuous casting crystallizer covering slag for YQ450NQR1 high-strength and high-weather-resistant steel is provided, for example, the continuous casting crystallizer covering slag is used for continuous casting production of YQ450NQR1 high-strength and high-weather-resistant steel under the condition that the drawing speed is 0.7-0.9m/min, the quality of casting blanks can be improved, the surface defects of the casting blanks can be reduced, the quality of YQ450NQR1 steel blank shells can be always kept better in the continuous casting process, the continuous casting of the steel types is ensured to be smooth, and the production cost is reduced.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Example 1
The embodiment provides a continuous casting crystallizer covering slag for YQ450NQR1 high-strength and high-weather-resistant steel B, which comprises the following raw materials in parts by weight: 10.6 parts of glass powder, 6 parts of fluorite, 16 parts of white alkali, 1.5 parts of carbon black, 7.7 parts of graphite, 19.5 parts of premelted material, 24.5 parts of wollastonite, 3.7 parts of limestone, 5 parts of magnesia, 1 part of lithium carbonate, 2 parts of carboxymethyl cellulose and 2.5 parts of borax.
Wherein the carbon content of the carbon black is 98.2%, and the oil absorption value is 127g/cm 3 The iodine absorption value is 142g/kg; the carbon content of the graphite is 90.2%, and the oil absorption value is 72g/cm 3 The iodine absorption value is 82g/kg.
The chemical components contained in the mold flux are as follows: caO 26.3%, siO 2 30.86％、MgO 5.83％、Fe 2 O 3 0.40％、Al 2 O 3 2.5％、Na 2 O 11.81％、F - 4.53％、B 2 O 3 1.5％、Li 2 0.4% of O and 8.62% of C, and the balance of unavoidable impurities and loss on ignition. The protecting slag Na + 、Li + 、F - And B 2 O 3 The total amount was controlled to 15.4.
Binary basicity (CaO/SiO) of physical index of the mold flux 2 ) 0.85, a melting temperature of 1182 ℃, and a viscosity of 0.94 pa.s at 1300 ℃.
The preparation method of the covering slag comprises the following steps: firstly, grinding glass powder, fluorite, limestone, magnesia, premelt and wollastonite into powder for standby. Adding an adhesive (carboxymethyl cellulose) into a mixing tank filled with water according to a proportion, sequentially adding a carbonaceous material (carbon black and graphite), a chemical material (white alkali, borax and lithium carbonate), a ground adjustment material (glass powder, fluorite, limestone and magnesia) and a ground base material (premelting material and wollastonite), pulping and uniformly mixing for 60 minutes to obtain slurry. Pumping the slurry into a high Wen Dana spray granulation machine with the temperature of 550 ℃, sieving the slurry by a 80-mesh sieve vibrating screen, and packaging qualified products.
Testing the obtained continuous casting crystallizer casting powder of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel in a certain factory at home, wherein the model of the testing slag is XLH-1, the model of the testing steel YQ450NQR1, and the cross section is 280 multiplied by 380mm 2 The pulling speed is 0.7-0.9m/min. And co-testing the mold flux for 3T. In the test process, the model casting powder has good spreadability and fluidity in the crystallizer, the thickness of the liquid slag layer is 10-15mm under the condition of controlling the total slag layer to be 45-65mm, the slag layer structure is obvious, the thickness of the liquid slag layer is proper, the flame size of the liquid level of the crystallizer is proper, the average slag consumption is 0.7-0.75kg/T, the slag strip generation speed in the crystallizer is slow, the surface of the casting blank produced by the test is defect-free, and the later-stage steel rolling detection data shows that the casting blank has no carburetion and slag inclusion defect, so that a good effect is achieved.
Example 2
The embodiment provides a continuous casting crystallizer covering slag for YQ450NQR1 high-strength and high-weather-resistant steel B, which comprises the following raw materials in parts by weight: 8 parts of glass powder, 8 parts of fluorite, 13 parts of white alkali, 2.0 parts of carbon black, 8.0 parts of graphite, 14.5 parts of premelted material, 32.5 parts of wollastonite, 3 parts of limestone, 4.5 parts of magnesia, 2 parts of lithium carbonate, 1.5 parts of dextrin and 3 parts of borax.
Wherein the carbon content of the carbon black is 98.2%, and the oil absorption value is 127g/cm 3 The iodine absorption value is 142g/kg; the carbon content of the graphite is 90 percent, and the oil absorption value is 72g/cm 3 The iodine absorption value is 82g/kg.
The chemical components contained in the mold flux are as follows: 26.56% of CaO and SiO 2 29.51％、MgO 4.21％、Fe 2 O 3 0.80％、Al 2 O 3 3.95％、Na 2 O 8.85％、F - 5.73％、B 2 O 3 2.0％、Li 2 0.8% of O and 9.6% of C, and the balance of unavoidable impurities and loss on ignition. The protecting slag Na + 、Li + 、F - And B 2 O 3 The total amount was controlled to 14.46.
Binary basicity (CaO/SiO) of physical index of the mold flux 2 ) 0.90, a melting temperature of 1181 ℃, and a viscosity of 0.95 Pa.s at 1300 ℃.
The preparation method is the same as in example 1.
Testing the obtained continuous casting crystallizer casting powder of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel in a certain factory at home, wherein the model of the testing slag is XLH-2, the model of the testing steel YQ450NQR1, and the section is 380 multiplied by 430mm 2 The pulling speed is 0.5-0.7m/min. And 5T of co-testing mold flux. In the test process, the model casting powder has good spreadability and fluidity in the crystallizer, the thickness of the liquid slag layer is 10-15mm under the condition of controlling the total slag layer to be 50-60mm, the slag layer structure is obvious, the thickness of the liquid slag layer is proper, the flame size of the liquid level of the crystallizer is proper, the average slag consumption is 0.6-0.7kg/T, the slag strip generation speed in the crystallizer is slow, the surface of the casting blank produced by the test is defect-free, and the later-stage steel rolling detection data shows that the casting blank has no carburetion and slag inclusion defect, so that a good effect is achieved.
Example 3
The embodiment provides a continuous casting crystallizer covering slag for YQ450NQR1 high-strength and high-weather-resistant steel slabs, which comprises the following raw materials in parts by weight: 3 parts of glass powder, 8 parts of fluorite, 14 parts of white alkali, 2 parts of carbon black, 8 parts of graphite, 20 parts of wollastonite, 24 parts of premelted material, 10 parts of limestone, 4.5 parts of magnesia, 2.5 parts of lithium carbonate, 1 part of starch and 3.0 parts of borax.
Wherein the carbon content of the carbon black is 98.2%, and the oil absorption value is 127g/cm 3 The iodine absorption value is 142g/kg; the carbon content of the graphite is 90.2%, and the oil absorption value is 72g/cm 3 The iodine absorption value is 82g/kg.
The chemical components contained in the mold flux are as follows: 27.16% of CaO and SiO 2 28.62％、MgO 4.82％、Fe 2 O 3 0.95％、Al 2 O 3 5.02％、Na 2 O 10.88％、F - 5.9％、B 2 O 3 2.01％、Li 2 O1.0% and C9.2%, the balance being unavoidable impurities and loss on ignition. The protecting slag Na + 、Li + 、F - And B 2 O 3 The total amount was controlled to 15.5.
Binary basicity (CaO/SiO) of physical index of the mold flux 2 ) 0.95, a melting temperature of 1195℃and a viscosity of 0.96 Pa.s at 1300 ℃.
The preparation method is the same as in example 1.
Testing the obtained continuous casting crystallizer casting powder of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel in a certain factory at home, wherein the model of the testing slag is XLH-3, and the cross section of the testing steel YQ450NQR1 is 280 multiplied by 380mm 2 The pulling speed is 0.7-1.2m/min. And co-testing the mold flux for 3T. In the test process, the model casting powder has good spreadability and fluidity in the crystallizer, the thickness of the liquid slag layer is 12-15mm under the condition of controlling the total slag layer to be 50-65mm, the slag layer structure is obvious, the thickness of the liquid slag layer is proper, the flame size of the liquid surface of the crystallizer is proper, the average slag consumption is 0.51-0.55kg/T, the slag strip generation speed in the crystallizer is slow, the surface of the casting blank produced by the test is defect-free, and the later-stage steel rolling detection data shows that the casting blank has no carburetion and slag inclusion defect, so that a good effect is achieved.
Example 4
The embodiment provides a continuous casting crystallizer covering slag for YQ450NQR1 high-strength and high-weather-resistant steel slabs, which comprises the following raw materials in parts by weight: 11 parts of glass powder, 6 parts of fluorite, 15 parts of white alkali, 2 parts of carbon black, 6.5 parts of graphite, 27.2 parts of wollastonite, 13 parts of premelt, 5.5 parts of limestone, 5.5 parts of magnesia, 2.5 parts of lithium carbonate, 1.8 parts of carboxymethyl cellulose and 4 parts of borax.
Wherein the carbon content of the carbon black is 98.2%, and the oil absorption value is 127g/cm 3 The iodine absorption value is 142g/kg; the carbon content of the graphite is 90.2%, and the oil absorption value is 72g/cm 3 The iodine absorption value is 82g/kg.
The chemical components contained in the mold flux are as follows: 26.78% of CaO and SiO 2 31.14％、MgO 5.12％、Fe 2 O 3 0.95％、Al 2 O 3 5.52％、Na 2 O 11.50％、F - 4.9％、B 2 O 3 2.4％、Li 2 O1.0% and C8.3%, the balance being unavoidable impurities and loss on ignition. The protecting slag Na + 、Li + 、F - And B 2 O 3 The total amount was controlled to 16.85.
Binary basicity (CaO/SiO) of physical index of the mold flux 2 ) 0.86, a melting temperature of 1185 ℃, and a viscosity of 0.93 pa.s at 1300 ℃.
The preparation method is the same as in example 1.
Testing the obtained continuous casting crystallizer casting powder of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel in a certain factory at home, wherein the model of the testing slag is XLH-4, and the cross section of the testing steel YQ450NQR1 is 280 multiplied by 380mm 2 The pulling speed is 0.7-1.2m/min. And 5T of co-testing mold flux. In the test process, the model casting powder has good spreadability and fluidity in the crystallizer, the thickness of the liquid slag layer is 12-16mm under the condition of controlling the total slag layer to be 50-65mm, the slag layer structure is obvious, the thickness of the liquid slag layer is proper, the flame size of the liquid level of the crystallizer is proper, the average slag consumption is 0.45-0.48kg/T, the slag strip generation speed in the crystallizer is slow, the surface of a casting blank produced by the test has slight crack defects, and the later steel rolling detection data shows that the casting blank has no carburetion and slag inclusion defects, so that the use requirement of a steel mill is met.
Comparative example 1
The embodiment provides a continuous casting crystallizer covering slag for YQ450NQR1 high-strength and high-weather-resistant steel slabs, which comprises the following raw materials in parts by weight: 5 parts of glass powder, 5 parts of fluorite, 8 parts of white alkali, 1.5 parts of carbon black, 9.0 parts of graphite, 32 parts of wollastonite, 20.5 parts of premelt, 6 parts of limestone, 4.5 parts of magnesia, 1.5 parts of lithium carbonate, 2 parts of carboxymethyl cellulose and 5 parts of borax.
Wherein the carbon content of the carbon black is 98.2%, and the oil absorption value is 127g/cm 3 The iodine absorption value is 142g/kg; the carbon content of the graphite is 90.2%, and the oil absorption value is 72g/cm 3 The iodine absorption value is 82g/kg.
The chemical components contained in the mold flux are as follows: 27.6% of CaO and SiO 2 29.04％、MgO 4.32％、Fe 2 O 3 0.95％、Al 2 O 3 3.52％、Na 2 O 6.61％、F - 3.9％、B 2 O 3 3.3％、Li 2 0.6% of O and 9.85% of C, and the balance of unavoidable impurities and loss on ignition. The protecting slag Na + 、Li + 、F - And B 2 O 3 The total amount was controlled to 12.22.
Binary basicity (CaO/SiO) of physical index of the mold flux 2 ) 0.95, a melting temperature of 1195℃and a viscosity of 0.85 Pa.s at 1300 ℃.
The preparation method is the same as in example 1.
Testing the obtained continuous casting crystallizer casting powder of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel in a certain factory at home, wherein the model of the testing slag is XLH-5, and the cross section of the testing steel YQ450NQR1 is 280 multiplied by 380mm 2 The pulling speed is 0.7-1.2m/min. And co-testing the mold flux for 3T. In the test process, the mold flux has good spreadability and fluidity in the crystallizer, the thickness of the liquid slag layer is 12-18mm under the condition of controlling the total slag layer to be 50-65mm, the slag layer structure is obvious, the thickness of the liquid slag layer is proper, the flame size of the liquid surface of the crystallizer is proper, the average slag consumption is 0.35-0.37kg/T, the slag consumption is small, the lubrication is poor, the slag strip generation speed in the crystallizer is faster, the bonding alarm is carried out, the surface of a casting blank produced by the test has concave and bonding defects, the later-stage steel rolling detection data shows that the casting blank has internal crack defects, the use effect is poor, and the production requirement cannot be met.
As can be seen from comparative example 1, when the amount of white alkali is less than 12 parts, F - Content of Na less than 4% + 、Li + 、F - And B 2 O 3 The total amount of (2) is less than 13%, the viscosity of the mold flux is less than 0.98, the surface of the casting blank has pits and bonding defects in the use process,in the later stage steel rolling process, internal crack defects are generated in the casting blank, and the process cannot be carried out smoothly.
Comparative example 2
The embodiment provides a continuous casting crystallizer covering slag for YQ450NQR1 high-strength and high-weather-resistant steel B, which comprises the following raw materials in parts by weight: 10.6 parts of glass powder, 5.5 parts of fluorite, 18 parts of white alkali, 1.5 parts of carbon black, 6.7 parts of graphite, 35.5 parts of premelt, 8.7 parts of limestone, 6 parts of magnesia, 1 part of lithium carbonate, 2 parts of carboxymethyl cellulose and 4.5 parts of borax.
Wherein the carbon content of the carbon black is 98.2%, and the oil absorption value is 127g/cm 3 The iodine absorption value is 142g/kg; the carbon content of the graphite is 90.2%, and the oil absorption value is 72g/cm 3 The iodine absorption value is 82g/kg.
The chemical components contained in the mold flux are as follows: caO 22.3%, siO 2 26.86％、MgO 5.83％、Fe 2 O 3 0.40％、Al 2 O 3 2.5％、Na 2 O 14.81％、F - 4.53％、B 2 O 3 3.0％、Li 2 0.4% of O and 7.62% of C, and the balance of unavoidable impurities and loss on ignition. The protecting slag Na + 、Li + 、F - And B 2 O 3 The total amount was controlled to 18.58.
Binary basicity (CaO/SiO) of physical index of the mold flux 2 ) 0.83, a melting temperature of 1132℃and a viscosity of 1.01 Pa.s at 1300 ℃.
The preparation method is the same as in example 1.
Testing the obtained continuous casting crystallizer casting powder of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel in a certain factory at home, wherein the model of the testing slag is XLH-6, and the cross section of the testing steel YQ450NQR1 is 280 multiplied by 380mm 2 The pulling speed is 0.7-0.9m/min. And co-testing the mold flux for 3T. In the test process, the model casting powder has good spreadability and fluidity in the crystallizer, the thickness of the liquid slag layer is 10-15mm under the condition of controlling the total slag layer to be 45-65mm, the slag layer structure is obvious, the thickness of the liquid slag layer is proper, the flame size of the liquid level of the crystallizer is proper, the average slag consumption is 0.8-0.9kg/T, the generation speed of slag strips in the crystallizer is slow, the surface longitudinal cracks of the casting blank produced by the test are more defects, and the later steel rolling detection data are obtainedThe casting blank is free from carburetion and slag inclusion defects, and the effect required by a steel mill cannot be achieved.
As can be seen from comparative example 2, when the amount of white alkali is more than 15 parts, wollastonite is not contained, C content is less than 8% and Na + 、Li + 、F - And B 2 O 3 The total amount of (2) is higher than 17%, so that the melting temperature of the casting powder is lower than 1180 ℃, and the casting blank surface has more defects in the use process.
Comparative example 3
The embodiment provides a continuous casting crystallizer covering slag for YQ450NQR1 high-strength and high-weather-resistant steel B, which comprises the following raw materials in parts by weight: 8 parts of glass powder, 2 parts of fluorite, 9 parts of white alkali, 2.0 parts of carbon black, 9.1 parts of graphite, 20 parts of premelted material, 39.4 parts of wollastonite, 3 parts of limestone, 3 parts of magnesia, 1.5 parts of carboxymethyl cellulose and 3 parts of borax.
Wherein the carbon content of the carbon black is 98.2%, and the oil absorption value is 127g/cm 3 The iodine absorption value is 142g/kg; dan Mohei has a carbon content of 90.2% and an oil absorption of 72g/cm 3 The iodine absorption value is 82g/kg.
The chemical components contained in the mold flux are as follows: 24.56% CaO and SiO 2 27.29％、MgO 2.81％、Fe 2 O 3 0.80％、Al 2 O 3 3.95％、Na 2 O 6.85％、F - 2.73％、B 2 O 3 2.01% and C10.1%, the balance being unavoidable impurities and loss on ignition. The protecting slag Na + 、Li + 、F - And B 2 O 3 The total amount was controlled to 11.59.
Binary basicity (CaO/SiO) of physical index of the mold flux 2 ) 0.90, a melting temperature of 1181 ℃, and a viscosity of 1.40 Pa.s at 1300 ℃.
The preparation method is the same as in example 1.
Testing the obtained continuous casting crystallizer casting powder of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel in a certain factory at home, wherein the model of the testing slag is XLH-7, the model of the testing steel YQ450NQR1, and the section is 380 multiplied by 430mm 2 The pulling speed is 0.5-0.7m/min. And co-planning test protective slag 2T. In the test process, the mold flux of the model is in a crystallizerThe spreadability and the fluidity are good, under the condition of controlling the total slag layer to be 50-60mm, the thickness of the liquid slag layer is 10-15mm, the slag layer structure is obvious, the thickness of the liquid slag layer is proper, the flame size of the liquid level of the crystallizer is proper, the average slag consumption is 0.3-0.37kg/T, the slag strip generation speed in the crystallizer is slow, the continuous bonding alarm is carried out in the production process, bonding leakage occurs in 200kg of test, and the test fails.
As can be seen from comparative example 3, when the fluorite amount is less than 4 parts, the white alkali amount is less than 12 parts, the magnesia amount is less than 4 parts, the composition does not contain lithium carbonate, the MgO content is less than 4% F - Content of less than 4%, C content of more than 10% and Na + 、Li + 、F - And B 2 O 3 The total amount of the powder is lower than 13 percent, the viscosity of the covering slag is increased to 1.4 Pa.s sharply, the bonding alarm is caused, the bonding steel leakage phenomenon occurs, and the production requirement cannot be met.
In conclusion, the YQ450NQR1 high-strength and high-weather-resistant steel continuous casting crystallizer casting powder is suitable for continuous casting of YQ450NQR1 high-strength and high-weather-resistant steel with the drawing speed of 0.5-1.20m/min, the alkalinity is controlled to be between 0.85 and 0.95, the melting point is 1180-1195 ℃, the viscosity is between 0.93 and 0.97, and the continuous casting requirement of YQ450NQR1 high-strength and high-weather-resistant steel can be met. The method has the advantages of easily obtained raw material selection, low price, reasonable design of performance indexes, good lubrication and heat transfer effects, uniform and moderate thickness of a liquid slag layer, capability of ensuring the smooth operation of a hot-work die steel slab continuous casting process, prevention of surface quality defects of a casting blank and good casting blank quality.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A continuous casting crystallizer casting powder for YQ450NQR1 high-strength and high-weather-resistant steel is characterized in that the casting powder comprises the following chemical components in percentage by weight + 、Li + 、F - And B 2 O 3 In a total amount of 13-17%, saidThe melting point of the covering slag is 1180-1195 ℃, the viscosity is 0.93-0.97 Pa.s, and the binary alkalinity is 0.85-0.95;
the chemical components comprise 25-28% of CaO and 26.3-31.76% of SiO 2 4-6% MgO, 2-6% Al 2 O 3 0.2-2% Fe 2 O 3 8-13% Na 2 O, 4-6% F - 1.5 to 2.5 percent of B 2 O 3 0.4-1.2% Li 2 O and 8-10% of C, the balance being unavoidable impurities and loss on ignition;
the casting powder is used for continuous casting production of YQ450NQR1 high-strength and high-weather-resistant B-shaped steel under the condition that the pulling speed is 0.7-0.9m/min.
2. The continuous casting mold flux for YQ450NQR1 high-strength and high-weather-resistant type B steel according to claim 1, wherein the raw materials for preparing the mold flux comprise glass powder, fluorite, white alkali, lithium carbonate, borax, a carbonaceous material, premelted material, wollastonite, limestone, magnesia and a binder.
3. The continuous casting mold flux for YQ450NQR1 high strength, high weather resistant b steel of claim 2, wherein the carbonaceous material comprises carbon black and graphite.
4. The continuous casting mold powder for YQ450NQR1 high-strength and high-weather-resistant steel of claim 3, wherein the carbon content of the carbon black is more than or equal to 98%, and the oil absorption value is more than 100g/cm 3 The iodine absorption value is more than 130g/kg; the carbon content of the graphite is more than or equal to 90 percent, and the oil absorption value is more than 35g/cm 3 The iodine absorption value is more than 55g/kg.
5. The continuous casting mold flux for YQ450NQR1 high-strength and high-weather-resistant grade B steel according to claim 4, wherein the preparation raw materials comprise, by weight, 3-11 parts of the glass powder, 6-8 parts of the fluorite, 13-16.7 parts of the white alkali, 1-3 parts of the lithium carbonate, 2.5-4 parts of the borax, 1-3 parts of the carbon black, 6.5-9.0 parts of the graphite, 10-40 parts of the premelt, 20-42 parts of the wollastonite, 2-10 parts of the limestone, 4-6 parts of the magnesia, and 0.8-2.0 parts of the binder.
6. The continuous casting mold flux for YQ450NQR1 high strength, high weather resistant b steel according to claim 2, wherein the binder comprises at least one of dextrin, starch, and carboxymethyl cellulose.
7. The use of the mold flux for continuous casting of YQ450NQR1 high strength, high weather resistant b steel according to any one of claims 1-6, wherein the mold flux is used for continuous casting production of YQ450NQR1 high strength, high weather resistant b steel at a draw rate of 0.7-0.9m/min.
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