CN113151639A - Method for controlling deformation capacity of non-metallic inclusions in steel matrix based on viscosity - Google Patents

Method for controlling deformation capacity of non-metallic inclusions in steel matrix based on viscosity Download PDF

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CN113151639A
CN113151639A CN202110180212.2A CN202110180212A CN113151639A CN 113151639 A CN113151639 A CN 113151639A CN 202110180212 A CN202110180212 A CN 202110180212A CN 113151639 A CN113151639 A CN 113151639A
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steel matrix
viscosity
components
controlling
nonmetallic
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CN113151639B (en
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任英
张立峰
杨文�
李亚琼
任强
王祎
高小勇
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University of Science and Technology Beijing USTB
Yanshan University
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University of Science and Technology Beijing USTB
Yanshan University
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/076—Use of slags or fluxes as treating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • B22D11/116—Refining the metal
    • B22D11/117—Refining the metal by treating with gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention relates to a method for controlling the deformation capacity of nonmetallic inclusions in a steel matrix, which comprises the steps of determining target components and target rolling temperature which are expected to be reached by the nonmetallic inclusions under a plurality of different component systems under different temperatures according to different rolling temperature ranges on site and different components of the nonmetallic inclusions in the steel matrix by calculating the viscosity ratio of the nonmetallic inclusions to the steel matrix under the different temperature systems, and controlling and changing the components of the nonmetallic inclusions under the plurality of different component systems in the refining process to enable the components of the nonmetallic inclusions to reach the target components; meanwhile, because the viscosity of the non-metallic inclusion with different components is different at different temperatures, the invention can improve the deformability of the non-metallic inclusion in the whole production process and reduce the quality defect of steel products caused by the deformation of the non-metallic inclusion by controlling the rolling temperature as the target temperature.

Description

Method for controlling deformation capacity of non-metallic inclusions in steel matrix based on viscosity
Technical Field
The invention relates to a method for controlling the deformation capacity of non-metallic inclusions in a steel matrix based on viscosity, belonging to the field of steel metallurgy and steelmaking.
Background
The size, quantity and morphology of non-metallic inclusions in the steel matrix directly affect the properties of the final steel product and the quality defects of the steel. The non-metallic inclusion generated in the steel matrix is generated in the deoxidation reaction of the steel matrix in the converter tapping process, and because aluminum element has extremely strong deoxidation capability, aluminum deoxidation is one of the most common deoxidation processes. The deformability of non-metallic inclusions in the steel matrix determines the properties of the steel product, while non-metallic inclusions with poor deformability directly cause defects in the steel product. The content of alumina in the nonmetallic inclusion is a determining factor of the deformability of the nonmetallic inclusion, and the deformability of the alumina inclusion generated by aluminum deoxidation is poor, so that a plurality of quality defects of steel products can be generated. It is also considered that the deformability of the nonmetallic inclusions is related to the melting point of the nonmetallic inclusions, and the nonmetallic inclusions in a liquid state at the rolling temperature have good deformability, however, most of the nonmetallic inclusions are in a pure solid state during the rolling process, and the deformability of the nonmetallic inclusions in different solid states is difficult to be judged by the melting point of the nonmetallic inclusions.
Disclosure of Invention
In order to effectively improve the deformability of the nonmetallic inclusion in the steel matrix, the invention provides a method for controlling the deformability of the nonmetallic inclusion in the steel matrix based on viscosity.
The technical scheme provided by the invention is as follows: a method for controlling the deformability of non-metallic inclusions in a steel matrix based on viscosity, said method comprising the steps of:
s1, calculating the viscosity of the nonmetallic inclusion and the viscosity of a steel matrix under a plurality of different component systems at different temperatures according to different rolling temperature ranges on site and different components of the nonmetallic inclusion in the steel matrix, determining the components of the nonmetallic inclusion as target components under the condition that the viscosity ratio of the nonmetallic inclusion and the steel matrix is the minimum value, and taking the temperature at the moment as a target rolling temperature;
s2, in the process of refining a steel matrix, controlling the components of the nonmetallic inclusion by changing the components of refining slag and/or alloy auxiliary materials added into the steel matrix, so that the components of the nonmetallic inclusion in the refining process reach the target components;
s3, blowing inert gas into the tundish and carrying out casting operation in the continuous casting process of the steel substrate to prevent the components of the non-metallic inclusion from changing in the refining process;
and S4, controlling the heating temperature to be the target rolling temperature all the time in the hot rolling process of the steel matrix.
Further, in the step S1, the different composition of the non-metallic inclusion in the steel matrix is Al2O3、MgO、 SiO2、MnO、CaO、TiO2At least two or more of them in any combination.
Further, the sum of the contents of the different components in the nonmetallic inclusions in the step S1 is 100%.
Further, in the step S2, the basicity of the refining slag is reduced to 0.8 to 1.5 by adding quartz sand to the refining slag at the initial stage of refining, and the aluminum element in the steel matrix and the SiO in the refining slag are promoted2Performing a chemical reaction to control the inclusion of said non-metallic inclusionsAl of (2)2O3The contents of the components (c).
Further, in the step S2, the MgO content in the refining slag is controlled to 0% to 14% by adding dolomite to the refining slag at the initial stage of refining, thereby controlling the MgO content in the non-metallic inclusions.
Further, in the step S2, the MnO content in the refining slag is controlled to 0% to 8% by adding manganese ore to the refining slag at an early stage of refining, thereby controlling the content of MnO components in the non-metallic inclusion.
Further, in the step S2, the alloying auxiliary material includes aluminum impurity with a content of 0% to 5%, and the Al in the nonmetallic inclusion is changed by the aluminum impurity2O3The contents of the components (c).
Further, in the step S2, the alloying auxiliary material includes 0% to 10% of impurity element calcium, and the content of CaO in the non-metallic inclusion is changed by the impurity element calcium.
Further, the rolling temperature in the step S1 is 800 ℃ to 1300 ℃.
Further, the alloy auxiliary material in the step S2 is any one or a combination of several of ferrosilicon, silicon-manganese alloy, ferrochrome, silicon carbide, carbon wire and calcium carbide.
Technical effects of the invention
According to the method for controlling the deformation capacity of the nonmetallic inclusion in the steel matrix based on the viscosity, the target component and the target rolling temperature of the nonmetallic inclusion are determined by calculating the viscosity of the nonmetallic inclusion and the steel matrix under a plurality of different component systems at different rolling temperatures, the component content of the nonmetallic inclusion in the steel matrix is changed by adding refining slag and/or alloy auxiliary materials in the refining process of the steel matrix, and the viscosity ratio of the nonmetallic inclusion and the steel matrix at the target rolling temperature is maintained by controlling the heating temperature to be the target rolling temperature.
Drawings
FIG. 1 is a schematic view of the morphology of a non-metallic inclusion after rolling in example 1 of the present invention;
FIG. 2 is a schematic view of the morphology of the rolled nonmetallic inclusions in example 2 of the present invention.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The production process of the steel is 'steel making → refining → continuous casting → rolling', the non-metallic inclusion in the steel matrix exists in the whole production process of producing the steel material, in order to control the components of the non-metallic inclusion at different rolling temperatures in the production process to be preset expected target components, the invention is carried out based on the viscosity of the non-metallic inclusion of a plurality of different component systems and the viscosity of the steel matrix, and the steel matrix is correspondingly controlled in the production process according to the viscosity ratio of the non-metallic inclusion of each component system and the corresponding steel matrix, so that the components of the non-metallic inclusion in the steel matrix reach the expected target components, and the deformation capability of the non-metallic inclusion is effectively improved.
In order to better illustrate the method proposed by the present invention, the silicon-manganese deoxidized steel substrate is taken as an example for illustration, but the method of the present invention is not limited to the silicon-manganese deoxidized steel substrate.
The technical scheme provided by the invention is as follows: a method for controlling the deformability of non-metallic inclusions in a steel matrix based on viscosity, said method comprising the steps of:
(1) the Viscosity of the non-metallic inclusion with different components and the Viscosity ratio of the non-metallic inclusion with different components are calculated by a Viscosity module in the FactSage thermodynamic software through FactSage thermodynamic software, the rolling temperature range of 800-1300 ℃ is set in the production process, the corresponding rolling temperature and the components of the non-metallic inclusion with different components are input into the FactSage thermodynamic software, the Viscosity of the non-metallic inclusion of each component system and the Viscosity of the steel matrix corresponding to the Viscosity are calculated, the ratio of the Viscosity of the non-metallic inclusion and the Viscosity of the steel matrix is calculated, when the Viscosity ratio of the non-metallic inclusion and the Viscosity of the steel matrix of the components is the minimum value, the component of the non-metallic inclusion at the moment is determined to be the expected target component, the input temperature at the moment is the target rolling temperature, and the deformation capacity of the non-metallic inclusion of the target component at the target rolling temperature is the best.
(2) In the refining process of the steel matrix, the composition of the non-metallic inclusion in the steel matrix is mainly influenced by refining slag and alloy auxiliary materials added into the steel matrix. The chemical reaction of the refining slag and the steel matrix can change the chemical components of the steel matrix, the refining slag with different components and the nonmetallic inclusion in the steel matrix can also have chemical reactions with different degrees, and the component content of the refining slag has great influence on the components of the nonmetallic inclusion, so the slag discharge amount is strictly controlled in the converter tapping process, the total amount of the refining slag in the subsequent production process can be stably controlled, and the main component of the refining slag is Al2O3、SiO2MgO, CaO, MnO and the like, and the SiO in the refining slag is increased by adding quartz sand to the refining slag2Content of Al in the non-metallic inclusion, promotes the chemical reaction of the refining slag and the Al element in the steel matrix, thereby controlling the Al in the non-metallic inclusion2O3The component content of (a); the content of MgO in the refining slag is increased by adding dolomite into the refining slag, so that the MgO in the refining slag is promoted to be reduced into Mg element by alloy elements in a steel matrix to enter the steel matrix, and then nonmetal clips in the steel matrix are controlledThe component content of MgO in the impurities; controlling the MnO content in the refining slag by adding manganese ore into the refining slag, and promoting MnO in the refining slag to be reduced into Mn element by alloy elements in a steel matrix and enter the steel matrix, so that the component content of MnO in non-metal inclusions in the steel matrix is controlled; because the ferrosilicon, the silicomanganese alloy, the ferrochrome, the silicon carbide, the carbon wire, the calcium carbide and the like in the alloy auxiliary materials have different contents, the chemical components of the alloy auxiliary materials can be flexibly adjusted, so that the aluminum element and the calcium element in the alloy auxiliary materials with different components enter a steel matrix to generate chemical reaction with non-metallic inclusions in the steel matrix, and the Al in the non-metallic inclusions is changed2O3The contents of MgO and CaO influence the composition of the components of the nonmetallic inclusions, therefore, the contents of the components of the nonmetallic inclusions in the steel matrix are changed by adding refining slag and/or alloy auxiliary materials with different components into the steel matrix, the refining slag and the alloy auxiliary materials can be simultaneously added into the steel matrix, and any one of the refining slag and the alloy auxiliary materials can be also added into the steel matrix according to the requirement, so that the components of the nonmetallic inclusions in the steel matrix in the refining process can reach the expected target components finally.
(3) In the continuous casting process of the steel matrix, oxygen in the air enters the steel matrix to cause the steel matrix to generate secondary oxidation to generate a large amount of new non-metallic inclusions, and in order to prevent the generation of the phenomenon, the invention prevents the air from entering the steel matrix to generate secondary oxidation by blowing inert gas into the tundish and protecting casting, thereby avoiding the generation of a large amount of new non-metallic inclusions to cause the change of the components of the original non-metallic inclusions in the steel matrix.
(4) In the hot rolling process, the heating temperature is controlled to be always kept or close to the target rolling temperature, so that the viscosity ratio of the nonmetallic inclusion and the steel matrix in the hot rolling process is reduced, the fluidity of the nonmetallic inclusion in the steel matrix is improved, and the deformation capacity of the nonmetallic inclusion in the rolling process is improved.
Preferably, in step (1) in the embodiment of the present invention, the different components are Al2O3、MgO、SiO2、 MnO、CaO、TiO2At least two of them are combined arbitrarily by a scanning electron microscopeAnd energy spectrum detection determination.
Preferably, the FactSage thermodynamic software has the advantages of being rich in database content, powerful in calculation function, simple and easy to operate under a Windows platform and the like, and is suitable for calculating and simulating a complex production process, so that the Viscosity calculation module of the FactSage thermodynamic software is adopted in the step (1) in the embodiment of the invention, the respective viscosities of the nonmetallic inclusions in each component system and the corresponding Viscosity of the steel matrix under the input rolling temperature are calculated according to the rolling temperature range of 800-1300 ℃ and the different components of the nonmetallic inclusions in the steel matrix set in the production process, and the Viscosity ratio of the Viscosity of the nonmetallic inclusions in each component system to the Viscosity of the steel matrix is calculated correspondingly under the input rolling temperature and the nonmetallic inclusions under a plurality of different component systems.
Preferably, the step (1) in the embodiment of the present invention calculates the non-metallic inclusions of different component systems, wherein the content of each component in the non-metallic inclusions ranges from 0% to 100%, and the sum of all the component contents is 100%;
preferably, in the step (2) of the embodiment of the invention, in the refining process of the steel matrix, the converter tapping strictly controls the slag discharge amount, the thickness of the refining slag in the subsequent process is stably controlled to be 5-7 cm, the components of the refining slag after the subsequent slag is reformed are ensured to be stable, the stable control of the chemical reaction between the refining slag and the steel matrix is realized, and thus the components of the non-metallic inclusions are effectively controlled;
preferably, the step (2) in the embodiment of the present invention is that the basicity (CaO/SiO) of the refining slag is added by adding quartz sand at the early stage of refining in the refining process of the lf (ladle funace) ladle refining furnace2) Reducing the content to 0.8 to 1.5, and promoting aluminum element in a steel matrix and SiO in refining slag2Reacting to reduce the aluminum content in the steel matrix, thereby leading the Al in the non-metallic inclusion2O3The content of the components is gradually reduced;
preferably, in the step (2) of the embodiment of the invention, in the refining process of the LF ladle refining furnace, slag modification is carried out at the initial stage of refining, and the MgO content in the refining slag is controlled to be 0-14% by adding dolomite of which the main component is magnesium oxide, so that the MgO content in the non-metallic inclusion is controlled;
preferably, in the step (2) of the embodiment of the invention, in the refining process of the LF ladle refining furnace, the MnO content in the refining slag is controlled to be 0-8% by adding manganese ore of which the main component is manganese oxide in the initial stage of refining, so that the MnO content in the non-metallic inclusion is controlled;
preferably, in the step (2) of the embodiment of the invention, the alloying materials are added into the steel matrix in the refining process of the LF ladle refining furnace to regulate and control the components of the steel matrix, the alloying materials comprise 0-5% of impurity element aluminum, and the impurity element aluminum entering the steel matrix can influence the chemical reaction between the steel matrix and the nonmetallic inclusion, so that the Al in the nonmetallic inclusion is changed2O3The component content of (a);
preferably, in the step (2) of the embodiment of the invention, alloy auxiliary materials are added into the steel matrix in the refining process of the LF ladle refining furnace to regulate and control the components of the steel matrix, the used alloy auxiliary materials comprise 0-10% of calcium element, and the calcium element enters the steel matrix to influence the chemical reaction between the steel matrix and the nonmetallic inclusion, so that the component content of CaO in the nonmetallic inclusion is changed;
preferably, in the step (3) of the embodiment of the present invention, oxygen in the air may enter the steel substrate during the continuous casting of the steel substrate to secondarily oxidize the steel substrate, and in order to avoid this, the present invention prevents the air from entering to secondarily oxidize the steel substrate by performing protective casting, sealing the tundish, and blowing an inert gas such as argon and the like during the stable casting, thereby preventing the non-metallic inclusion in the steel substrate from being changed in composition due to the generation of a large amount of new non-metallic inclusions;
preferably, in the step (4) of the embodiment of the present invention, the heating temperature is controlled to be the target rolling temperature during the hot rolling of the steel matrix, so as to ensure the viscosity ratio of the nonmetallic inclusion to the steel matrix during the hot rolling, improve the fluidity of the nonmetallic inclusion in the steel matrix, and thus improve the deformability of the nonmetallic inclusion during the hot rolling.
The method selects a visual similarity calculation module for calculation through FactSage thermodynamic software. According to the rolling temperature range of 800 ℃ to 1300 ℃ set in the production process, the viscosity of the non-metallic inclusion of each component system and the viscosity of the corresponding steel matrix under a plurality of different component systems are calculated, and under the condition that the viscosity ratio of the non-metallic inclusion and the steel matrix of a certain component system is determined to be the minimum value at the rolling temperature, the components of the non-metallic inclusion at the moment are taken as target components, and the temperature at the moment is the target rolling temperature. In the refining process, the slag discharge amount of converter tapping is strictly controlled, the thickness of the refining slag in the subsequent process is stably reduced to 5-7 cm, and the components of the refining slag after the subsequent slag is reformed are stable; slag modification is carried out at the initial stage of refining, and the alkalinity of refining slag is reduced to 0.8 to 1.5 by adding quartz sand, so that Al in nonmetallic inclusions is controlled2O3The content of MgO in the refining slag is controlled to be 0-14% by adding dolomite, so that the content of MgO in the non-metallic inclusions is controlled; by adding manganese ore, the MnO content in the refining slag is controlled to be 0-8%, so that the MnO content in the non-metallic inclusions is controlled; during the refining process, the component content of the non-metallic inclusion can be controlled by changing the components of the alloy auxiliary materials added into the steel matrix, specifically, when the aluminum content in the alloy auxiliary materials is 0-5%, the Al content in the non-metallic inclusion can be controlled2O3Content (c); when the content of calcium in the alloy auxiliary materials is 0-10%, the content of CaO in the non-metallic inclusions can be controlled; protective casting is carried out in the continuous casting process, the tundish is sealed, argon inert gas is blown in the stable casting process, secondary oxidation of a steel matrix is prevented, and the condition that the components of nonmetallic inclusions are changed due to generation of a large amount of new nonmetallic inclusions is avoided; in the hot rolling process, the heating temperature is controlled to be the target rolling temperature, the viscosity ratio of the nonmetallic inclusion to the steel matrix in the hot rolling process is kept, the fluidity of the nonmetallic inclusion in the steel matrix is improved, and the deformation capacity of the nonmetallic inclusion in the rolling process is improved.
The present invention will be described in further detail with reference to specific embodiments below:
example 1:
the Vicosity calculation module was selected to calculate viscosity by the FactSage thermodynamic software. The method determines that the main component of the non-metallic inclusion in the steel matrix is Al by detecting samples in the cord steel continuous casting billet through a scanning electron microscope and an energy spectrum2O3-SiO2MnO, according to the rolling temperature range of 900 ℃ to 1000 ℃ set in the production process, the viscosity of the steel matrix is 1.2 x 10 at the rolling temperature of 1000 DEG C7Pa.S, calculated component of Al2O3-SiO2Viscosity of non-metallic inclusion and viscosity of steel matrix in MnO system, and the minimum value of the ratio of viscosity of non-metallic inclusion and steel matrix at the rolling temperature is determined to be 1.67X 10-8Under the condition, the target component of the non-metallic inclusion is 5% of Al2O3-24％SiO2-71% MnO and a target rolling temperature of 1000 ℃. In the refining process, the slag discharge amount of converter tapping is strictly controlled, the thickness of the refining slag in the subsequent process is stably reduced to 6.2 cm, and the components of the refining slag after the subsequent slag is reformed are stable; modifying slag at the initial stage of refining, adding quartz sand to reduce the alkalinity of refining slag to 1.0, and controlling Al in nonmetallic inclusion2O3Content (c); the MgO content in the refining slag is controlled to be 4 percent by adding dolomite, and the MgO content in the non-metallic inclusions is controlled; by adding manganese ore, the MnO content in the refining slag is controlled to be 4%, and the MnO content in the non-metallic inclusions is controlled; alloying the alloy auxiliary materials in the LF refining process of the ladle refining furnace, wherein the aluminum content in the alloy auxiliary materials is 0.4 percent, and controlling Al in non-metallic inclusions2O3Content (c); the calcium content in the used alloy auxiliary materials is 0.2 percent, and the CaO content in the non-metallic inclusions is controlled; protective casting is carried out in the continuous casting process, the tundish is sealed, argon is blown in the stable casting process, and secondary oxidation of a steel matrix is prevented; the actual rolling temperature is controlled to be 1000 ℃, and the non-metallic inclusion component in the rolled steel matrix is 6 percent of Al2O3-30％SiO2MnO of 64% and a viscosity ratio of non-metallic inclusion to steel matrix of 5.83X 10-8The shape of the nonmetallic inclusion is shown in figure 1, the nonmetallic inclusion is in a strip shape, and the deformability is good.
Example 2:
the Vicosity calculation module was selected to calculate viscosity by the FactSage thermodynamic software. The main component of the non-metallic inclusion in the steel matrix is Al which is determined by detecting samples in the stainless steel continuous casting billet through a scanning electron microscope and an energy spectrum2O3-SiO2MnO, according to the rolling temperature range of 1050 ℃ to 1200 ℃ set in the production process, it was determined that the viscosity of the steel matrix was 7.0X 10 at the rolling temperature of 1200 DEG C6Pa · S, calculating a plurality of Al2O3-SiO2Viscosity of non-metallic inclusion and viscosity of steel matrix in MnO composition system, and the minimum value of the viscosity ratio of non-metallic inclusion and steel matrix at rolling temperature is determined to be 1.0X 10-7Under the condition, the target component of the non-metallic inclusion is 19% of Al2O3-20％SiO2-61% MnO, target rolling temperature 1200 ℃. In the refining process, the slag discharge amount of converter tapping is strictly controlled, the thickness of the refining slag in the subsequent process is stably reduced to 6.6 cm, and the components of the refining slag after the subsequent slag is reformed are stable; modifying slag at the initial stage of refining, reducing the alkalinity of refining slag to 1.1 by adding quartz sand, and controlling Al in nonmetallic inclusion2O3Content (c); the MgO content in the refining slag is controlled to be 3 percent by adding dolomite, and the MgO content in the non-metallic inclusions is controlled; by adding manganese ore, the MnO content in the refining slag is controlled to be 4%, and the MnO content in the non-metallic inclusions is controlled; alloying the alloy auxiliary materials in the LF refining process of the ladle refining furnace, wherein the aluminum content in the alloy auxiliary materials is 0.6 percent, and controlling the Al in the non-metallic inclusions2O3Content (c); the calcium content in the used alloy auxiliary materials is 0.4 percent, and the CaO content in the non-metallic inclusions is controlled; protective casting is carried out in the continuous casting process, the tundish is sealed, argon is blown in the stable casting process, and secondary oxidation of a steel matrix is prevented; the actual rolling temperature is controlled to be 1200 ℃, and the components of non-metallic inclusions in the steel matrix after rolling are 20 percent of Al2O3-18％SiO2MnO of 62%, the viscosity ratio of non-metallic inclusions to steel matrix being 1.1X 10-7The non-metallic inclusion is in a strip shape and has good deformability.
The foregoing description shows and describes several preferred embodiments of the invention, but as aforementioned, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A method for controlling the deformability of non-metallic inclusions in a steel matrix based on viscosity, characterized in that it comprises the following steps:
s1, calculating the viscosity of the nonmetallic inclusion and the viscosity of a steel matrix under a plurality of different component systems at different temperatures according to different rolling temperature ranges on site and different components of the nonmetallic inclusion in the steel matrix, determining the components of the nonmetallic inclusion as target components under the condition that the viscosity ratio of the nonmetallic inclusion and the steel matrix is the minimum value, and taking the temperature at the moment as a target rolling temperature;
s2, in the process of refining a steel matrix, controlling the components of the nonmetallic inclusion by changing the components of refining slag and/or alloy auxiliary materials added into the steel matrix, so that the components of the nonmetallic inclusion in the refining process reach the target components;
s3, blowing inert gas into the tundish and carrying out casting operation in the continuous casting process of the steel substrate to prevent the components of the non-metallic inclusion from changing in the refining process;
and S4, controlling the heating temperature to be the target rolling temperature all the time in the hot rolling process of the steel matrix.
2. The method for controlling deformability of non-metallic inclusions in a steel substrate based on viscosity according to claim 1, wherein different composition of non-metallic inclusions in said steel substrate is Al in said step S12O3、MgO、SiO2、MnO、CaO、TiO2At least two or more of them in any combination.
3. The method for controlling deformability of nonmetallic inclusions in steel substrates based on viscosity as claimed in claim 1, wherein the sum of the contents of different components in the nonmetallic inclusions in said step S1 is 100%.
4. The method for controlling deformability of nonmetallic inclusions in steel matrix based on viscosity as claimed in any one of claims 1 to 3, wherein said step S2 is performed to reduce basicity of refining slag to 0.8 to 1.5 by adding silica sand to said refining slag at initial stage of refining to promote aluminum element in said steel matrix and said SiO in said refining slag2Performing a chemical reaction to control Al in the nonmetallic inclusion2O3The contents of the components (c).
5. The method for controlling deformability of nonmetallic inclusions in a steel matrix based on viscosity as claimed in claim 1, wherein said step S2 is performed to control the MgO content in the refining slag to 0% to 14% by adding dolomite to the refining slag at an early stage of refining, thereby controlling the MgO content in the nonmetallic inclusions.
6. The method for controlling deformability of non-metallic inclusions in a steel substrate based on viscosity according to any one of claims 1 to 3, wherein the content of MnO in the refining slag is controlled to 0% to 8% by adding manganese ore to the refining slag at an early stage of refining, thereby controlling the content of MnO in the non-metallic inclusions at the time of refining at step S2.
7. The method for controlling deformability of nonmetallic inclusions in steel substrates based on viscosity as claimed in claim 1, wherein said alloying additions in said step S2 include aluminum as impurity element in the amount of 0% to 5%, and said aluminum as impurity element changes Al in said nonmetallic inclusions2O3The contents of the components (c).
8. The method for controlling deformability of nonmetallic inclusions in steel substrates based on viscosity as claimed in claim 1, wherein said alloying additions include 0% to 10% of calcium as an impurity element, and the content of CaO in said nonmetallic inclusions is changed by said calcium as an impurity element in said step S2.
9. The method for controlling the deformability of nonmetallic inclusions in a steel matrix based on viscosity as claimed in claim 1, wherein the rolling temperature in said step S1 is 800 ℃ to 1300 ℃.
10. The method for controlling the deformability of nonmetallic inclusions in steel substrates based on viscosity according to claim 1, wherein the alloying additions in step S2 are any one or a combination of several of ferrosilicon, silicomanganese, ferrochrome, silicon carbide, carbon wire, and calcium carbide.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115856004A (en) * 2023-01-30 2023-03-28 中航久远科技(北京)有限公司 Method for predicting deformation capacity of inclusions in 430 ferritic stainless steel in hot rolling process

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03108658A (en) * 1989-08-09 1991-05-08 Sumitomo Metal Ind Ltd Method of detecting nonmetallic inclusion in high carbon steel
CN101492758A (en) * 2009-03-12 2009-07-29 首钢总公司 Method for controlling non-metallic inclusion in pipeline steel
CN101613784A (en) * 2009-07-16 2009-12-30 首钢总公司 A kind of method of controlling the HIC resistance pipeline nonmetallic inclusionsin steel
CN102329919A (en) * 2011-09-01 2012-01-25 攀钢集团攀枝花钢铁研究院有限公司 Control method of form of nonmetallic inclusion in steel
CN103045806A (en) * 2013-01-15 2013-04-17 北京科技大学 Method for controlling low-melting-point inclusion in high-strength low-alloy steel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03108658A (en) * 1989-08-09 1991-05-08 Sumitomo Metal Ind Ltd Method of detecting nonmetallic inclusion in high carbon steel
CN101492758A (en) * 2009-03-12 2009-07-29 首钢总公司 Method for controlling non-metallic inclusion in pipeline steel
CN101613784A (en) * 2009-07-16 2009-12-30 首钢总公司 A kind of method of controlling the HIC resistance pipeline nonmetallic inclusionsin steel
CN102329919A (en) * 2011-09-01 2012-01-25 攀钢集团攀枝花钢铁研究院有限公司 Control method of form of nonmetallic inclusion in steel
CN103045806A (en) * 2013-01-15 2013-04-17 北京科技大学 Method for controlling low-melting-point inclusion in high-strength low-alloy steel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
葛军亮 等: ""夹杂物的表观粘度与其塑性变形能力的关系"", 《2014年全国冶金物理化学学术会议论文集》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115856004A (en) * 2023-01-30 2023-03-28 中航久远科技(北京)有限公司 Method for predicting deformation capacity of inclusions in 430 ferritic stainless steel in hot rolling process
CN115856004B (en) * 2023-01-30 2023-05-05 中航久远科技(北京)有限公司 Method for predicting 430 deformation capability of inclusion in ferrite stainless steel in hot rolling process

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