CN111482566A - Continuous casting method of aluminum-containing peritectic high-strength automobile steel - Google Patents
Continuous casting method of aluminum-containing peritectic high-strength automobile steel 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/053—Means for oscillating the moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/055—Cooling the moulds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/07—Lubricating the moulds
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
Abstract
The invention discloses a continuous casting method of aluminum-containing peritectic high-strength automobile steel, which comprises the following steps: in the molten steel pouring process of the aluminum-containing peritectic high-strength automobile steel, three paths of argon blowing are carried out in the tundish, wherein the stopper rod, the water feeding port and the plates are opened; the crystallizer covering slag is used for casting, and the chemical components of the crystallizer covering slag comprise the following components in percentage by weight: al (Al)2O3：1.2％～1.6％，CaO：35％～45％，SiO2：30％～35％，F：8％～12％，Na2O+K2O: 1.0% -2.0%, MgO: 0.8% -1.0%, C: 4% -6%; the crystallizer adopts a first preset weak cooling process and a high-frequency small-amplitude process, wherein the first preset weak cooling process is used for controlling the heat flux density of a meniscus area of the crystallizer to be 1.0-2.0 MW m‑2(ii) a The continuous casting machine adopts a preset drawing speed to draw a casting blank containing aluminum peritectic high-strength automobile steel; and the continuous casting secondary cooling section adopts a second preset weak cooling process. Through the scheme, surface cracks and bonding defects of the casting blank are obviously reduced.
Description
Technical Field
The application relates to the technical field of high-strength automobile steel smelting, in particular to a continuous casting method of aluminum-containing peritectic high-strength automobile steel.
Background
The development trend of modern automobiles is light weight, energy saving, corrosion prevention, safety and comfort. Reducing energy consumption, reducing environmental pollution and saving limited resources are very important and urgent problems faced by people at present, and reducing the self weight of the automobile is one of important measures for improving the fuel economy of the automobile and saving energy consumption. The data show that the oil consumption is reduced by 6-8% and the emission is reduced by 4% when the automobile mass is reduced by 10%. The aluminum-containing peritectic high-strength automobile steel is characterized in that a certain amount of residual austenite is introduced on the basis of a traditional dual-phase steel ferrite and martensite dual-phase structure, and high strength is ensured and higher elongation is achieved through strain induced plasticity effect generated by the residual austenite in the deformation process. The aluminum-containing peritectic high-strength automobile steel has better forming capability in the application aspect, has obvious advantages in stable production of complex parts and avoiding stamping cracking compared with DP steel. Meanwhile, the good steel plate welding performance and the static load, high-speed stretching and fatigue characteristics of a welding joint can be ensured.
However, the aluminum-containing peritectic high-strength automobile steel belongs to high-aluminum molten steel because the carbon content is close to the peritectic point of an iron-carbon phase diagram, and the components contain more Al. High aluminum easily causes the modification of the mold powder, and aluminum [ Al ] in the molten steel]Easily generates a large amount of Al with oxygen in the air or mold flux2O3Inclusions causing water blockage or causing surface defects of the casting blank; meanwhile, peritectic reaction of molten steel near peritectic point components in the liquid phase cooling solidification process easily causes cracks of casting blanks, so that continuous casting of aluminum-containing peritectic high-strength automobile steel is difficult to stably control the quality of the casting blanks, and the aluminum-containing peritectic high-strength automobile steel is one of steel types difficult to continuously cast in continuous casting production. Therefore, how to solve the continuous casting problem of aluminum-containing warning high-strength automobile steel is very important.
Disclosure of Invention
The invention provides a continuous casting method of aluminum-containing peritectic high-strength automobile steel, which aims to solve or partially solve the technical problems that casting blank cracks and water blocking holes are easy to generate during continuous casting of the aluminum-containing peritectic high-strength automobile steel, and stable pouring cannot be performed.
In order to solve the technical problem, the invention provides a continuous casting method of aluminum-containing peritectic high-strength automobile steel, which comprises the following steps:
in the molten steel pouring process of the aluminum-containing peritectic high-strength automobile steel, three paths of argon blowing are carried out in the tundish, wherein the stopper rod, the water feeding port and the plates are opened;
using mold flux forCasting protection, wherein the chemical components of the crystallizer casting powder comprise the following components in percentage by weight: al (Al)2O3：1.2％～1.6％，CaO：35％～45％，SiO2：30％～35％，F：8％～12％，Na2O+K2O: 1.0% -2.0%, MgO: 0.8% -1.0%, C: 4% -6%, the balance being impurities; alkalinity CaO/SiO of crystallizer casting powder in pouring process2In the range of 1.0 to 1.4;
the crystallizer adopts a first preset weak cooling process and a high-frequency small-amplitude process, wherein the first preset weak cooling process is used for controlling the heat flux density of a meniscus area of the crystallizer to be 1.0-2.0 MW m-2；
The continuous casting machine adopts a preset drawing speed to draw a casting blank containing aluminum peritectic high-strength automobile steel;
and the continuous casting secondary cooling section adopts a second preset weak cooling process.
Optionally, in the molten steel pouring process of peritectic high-strength automobile steel, the superheat degree of the molten steel of the tundish is controlled to be 20-35 ℃.
Optionally, an included angle of 10-20 degrees is formed between the submerged nozzle below the tundish and the horizontal direction.
Optionally, the argon blowing amount at the stopper rod is 2-3L/min, the argon blowing amount at the water feeding port is 2-3L/min, and the argon blowing amount at the plate interval is 2-5L/min.
Optionally, the first preset weak cooling process specifically includes:
controlling the water flow of the wide surface of the crystallizer to be 3050-4250L/min, controlling the water flow of the narrow surface to be 390-610L/min, and controlling the temperature difference between the inlet water temperature and the outlet water temperature of cooling water of the crystallizer to be 8-11 ℃.
Optionally, the high-frequency small-amplitude process specifically includes:
the vibration frequency of the crystallizer is controlled to be 145-155 Hz, and the amplitude is controlled to be 5.5-6.5 mm.
Optionally, the second preset weak cooling process specifically includes:
and controlling the flow of cooling water of the second cooling section of the continuous casting machine to be 0.4-0.6L/kg.
Optionally, the continuous casting machine adopts a preset pulling speed to pull out a casting blank containing aluminum peritectic high-strength automobile steel, and the method specifically comprises the following steps:
when the section width of the casting blank is 1100-2150 mm, the continuous casting machine adopts a blank drawing speed of 0.8-1.2 m/min to draw the casting blank containing the aluminum peritectic high-strength automobile steel.
The invention also provides aluminum-containing peritectic high-strength automobile steel, and a casting blank of the aluminum-containing peritectic high-strength automobile steel is manufactured by any one continuous casting method in the technical scheme.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a continuous casting method of aluminum-containing peritectic high-strength automobile steel, which comprises the steps of firstly adjusting a component system of casting powder to ensure that the alkalinity of the casting powder is CaO/SiO2The casting speed is controlled to be 1-1.4 in the casting process, so that the crystallization capacity of molten steel in a peritectic reaction can be improved, the conduction heat transfer is weakened, and the crack sensitivity of a primary casting shell of a casting blank is reduced; meanwhile, the adjustment of the components of the casting powder effectively reduces the melting point of the casting powder, controls the reasonable viscosity and improves the lubrication between the crystallizer and the casting blank; then, combining with the adjustment of a continuous casting process, avoiding water blocking in the casting process, reducing the heat flux density of a meniscus area of the crystallizer, and preventing the surface of a casting blank from generating cracks by adopting weak cooling in a secondary cooling section of continuous casting; and then the lubrication between the crystallizer and the casting blank is further improved by combining the high-frequency small-amplitude vibration of the crystallizer. By the comprehensive action of the means, the problem of continuous casting of the aluminum-containing peritectic high-strength automobile steel is effectively solved, the surface quality of a casting blank is obviously improved, the number of times of casting blank cracks and bonding alarm is small, and the method can be widely applied to stable casting of the aluminum-containing peritectic high-strength automobile steel.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic flow diagram of a method for continuous casting of aluminum-containing peritectic high-strength automotive steel according to one embodiment of the invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.
During slab continuous casting, a tundish receives molten steel transferred by a ladle and distributes the molten steel to each crystallizer through a tundish nozzle; forming a casting blank with a primary blank shell with a certain thickness in the molten steel in the crystallizer through the cooling process control of cooling water introduced into the crystallizer; then, stably pulling out the casting blank from the crystallizer at a certain pulling speed, and further cooling the casting blank when the casting blank passes through a secondary cooling section of a continuous casting machine to solidify the interior of the casting blank; and then performing straightening and cutting to finally obtain a finished plate blank product.
The inventors have studied this in detail to solve the problems of casting blank defects and continuous casting difficulties caused by both high aluminum and peritectic reactions in aluminum-containing peritectic high-strength automobile steel, and found that the reason is: [ Al ] in molten Steel]Easy to modify the mold flux, [ Al ]]With too high SiO in the mold flux2Reaction to produce large amount of Al2O3(ii) a First of all, a large amount of Al2O3Will block the nozzle, secondly, Al2O3After the casting powder enters a crystallizer and floats to a meniscus, the casting powder is obviously modified, and various physical and chemical properties of the casting powder, such as viscosity, melting point and alkalinity of the casting powder, are greatly increased; the viscosity is too high, the spreadability and the melting property of the casting powder are poor, and the non-uniform slag film flowing into the space between the blank shell and the copper pipe is easy to cause; the thickness of a liquid slag layer is smaller than 10mm due to the over-high melting point, and the surface depression and crack incidence rate of the casting blank are increased; the alkalinity and the viscosity are too high, so that the casting powder liquid slag flowing between the blank shell and the copper pipe is provided with partial sintering slag to form slag strips, and the factors comprehensively influence the wetting of the slag flowing between the crystallizer and the casting blankThe sliding and heat transfer cause bonding breakout and uneven heat transfer, and promote the surface of the casting blank to generate pits and cracks.
On the other hand, the carbon steel with the carbon content of 0.09% -0.15% is subjected to peritectic reaction when being cooled to 1495 ℃ from a liquid phase, and because peritectic transformation of a phase and a gamma phase exists in the solidification process and is accompanied with large blank shell line shrinkage, a gap between a primary blank shell and a crystallizer hot surface is enlarged; meanwhile, steel in the composition range releases a large amount of solidification heat during solidification, so that cracks are easily formed at the weak part of a primary blank shell, and a breakout accident and surface quality defects of a casting blank are easily caused.
Therefore, more Al in the molten steel causes the modification of the casting powder, influences the lubrication between the crystallizer and the casting blank, causes the adhesion and uneven heat transfer, and aggravates the crack sensitivity of the shell of the casting blank by peritectic reaction, so that the surface of the aluminum-containing peritectic high-strength automobile steel casting blank is easily bonded and longitudinally cracked under the combined action of the aluminum-containing peritectic high-strength automobile steel casting blank, and the stable pouring of the aluminum-containing peritectic high-strength automobile steel casting blank is influenced.
Based on the principle research of the defects of the aluminum-containing peritectic high-strength automobile steel casting blank, the inventor provides an overall idea of a continuous casting method of aluminum-containing peritectic high-strength automobile steel in an optional embodiment as shown in fig. 1 through a large number of research and production experiments, and the overall idea specifically comprises the following steps:
s1: in the molten steel pouring process of the aluminum-containing peritectic high-strength automobile steel, three paths of argon blowing are carried out in the tundish, wherein the stopper rod, the water feeding port and the plates are opened;
s2: the crystallizer covering slag is used for casting, and the chemical components of the crystallizer covering slag comprise the following components in percentage by weight: al (Al)2O3：1.2％～1.6％，CaO：35％～45％，SiO2：30％～35％，F：8％～12％，Na2O+K2O: 1.0% -2.0%, MgO: 0.8% -1.0%, C: 4% -6%, the balance being impurities; alkalinity CaO/SiO of crystallizer casting powder in pouring process2In the range of 1.0 to 1.4;
s3: the crystallizer adopts a first preset weak cooling process and a high-frequency small-amplitude process, wherein the first preset weak cooling process is used for controlling heat flow of a meniscus area of the crystallizerDensity of 1.0 to 2.0MW m-2；
S4: the continuous casting machine adopts a preset drawing speed to draw a casting blank containing aluminum peritectic high-strength automobile steel;
s5: and the continuous casting secondary cooling section adopts a second preset weak cooling process.
The technical scheme is an improved scheme which is provided by comprehensively considering the problem cause of the aluminum-containing peritectic high-strength automobile steel in continuous casting, the technological method which is not mentioned in the scheme is the same as the existing continuous casting control technology, and the specific principle is as follows:
the crystallizer casting powder adopting the components can generate a large amount of Al in molten steel2O3The physical and chemical properties of the mold powder, such as alkalinity, melting point and viscosity, are controlled within reasonable ranges, and the alkalinity of the crystallizer mold powder is CaO/SiO during the casting process2The control is 1-1.4, preferably about 1.2, and the crystallization capacity of molten steel of the aluminum-containing peritectic high-strength automobile steel can be improved in the peritectic reaction stage in the solidification process, so that the conduction heat transfer is weakened, the heat flux density of a meniscus area of the crystallizer is reduced, and the crack sensitivity of a primary blank shell is reduced; but the alkalinity cannot be too low, otherwise, the heat transfer is remarkably increased, and the combination peritectic reaction is easy to cause crack generation; simultaneously, higher content of fluoride and certain content of Na are added into the covering slag2O+K2And O, the melting point of the casting powder can be effectively reduced, and the viscosity of the casting powder is controlled, so that the reasonable thickness of a liquid slag layer is ensured, the liquid slag lubricating effect between a crystallizer and a casting blank is improved, the surface of the casting blank is prevented from being sunken and cracked, and the surface bonding of the casting blank is reduced.
The problem of surface defects of the casting blank can be comprehensively solved by adjusting the components and alkalinity of the casting powder and combining with the adjustment of a continuous casting control process. Firstly, three argon blowing paths are opened in a tundish, molten steel stirring is increased to promote inclusion floating, the flowing condition of the molten steel is improved, and Al is effectively solved2O3The problem of water blockage; secondly, the crystallizer adopts weak cooling and controls the heat flux density, which has important effect on the solidification shrinkage of the primary blank shell of peritectic steel, the heat flux density of the meniscus area of the crystallizer is reduced by adopting the weak cooling of the crystallizer,the shrinkage of the meniscus primary blank shell is inhibited, the uniformity of heat flow in a meniscus area is facilitated, the uniformity of the thickness of the primary blank shell is promoted, and cracks, particularly longitudinal cracks, caused by thermal stress concentration are prevented; experimental data show that the heat flow density is controlled to be 1.0-2.0 MW-m-2Preferably 1.4, 1.6, 1.8MW · m-2The effect is optimal; thirdly, the high-frequency small-amplitude vibration of the crystallizer can improve the lubrication between the crystallizer and the casting blank and reduce the depth of the oscillation mark of the casting blank, thereby reducing the defects of transverse cracks, angular transverse cracks, casting powder involved in the blank shell, element segregation at the oscillation mark and the like on the surface of the casting blank; and finally, continuous casting adopts a preset speed to stably pull the casting blank, and the secondary cooling section adopts a weak cooling process, so that the condensation shrinkage stress of the casting blank is easily released, and the occurrence of casting blank cracks is reduced.
The pouring method provided by the embodiment is suitable for high-strength automobile steel with comprehensive carbon content in a peritectic component system and more aluminum and other alloy elements, and is particularly suitable for aluminum-containing peritectic high-strength automobile steel with the grades of 590MPa, 780MPa and the like, wherein the aluminum-containing peritectic high-strength automobile steel comprises the following main chemical components in percentage by weight: c: 0.13-0.15%, Si: 0.35-0.45%, Mn: 1.50-1.70%, Alt: 0.40-0.60%, Nb: 0.007-0.017% and the like.
In summary, in the continuous casting method of aluminum-containing peritectic high-strength automobile steel provided in this embodiment, the basicity CaO/SiO of the mold flux is first adjusted by adjusting the component system of the mold flux2The casting speed is controlled to be 1-1.4 in the casting process, so that the crystallization capacity of molten steel in a peritectic reaction can be improved, the conduction heat transfer is weakened, and the crack sensitivity of a primary casting shell of a casting blank is reduced; meanwhile, the adjustment of the components of the casting powder effectively reduces the melting point of the casting powder, controls the reasonable viscosity and improves the lubrication between the crystallizer and the casting blank; then, combining with the adjustment of a continuous casting process, avoiding water blocking in the casting process, reducing the heat flux density of a meniscus area of the crystallizer, and preventing the surface of a casting blank from generating cracks by adopting weak cooling in a secondary cooling section of continuous casting; and then the lubrication between the crystallizer and the casting blank is further improved by combining the high-frequency small-amplitude vibration of the crystallizer. By the comprehensive action of the means, the problem of continuous casting of the aluminum-containing peritectic high-strength automobile steel is effectively solved, the surface quality of the casting blank is obviously improved, and the casting is finishedThe blank has less cracks and bonding alarm times, and can be widely applied to stable casting of aluminum-containing peritectic high-strength automobile steel.
Based on the same inventive concept of the previous embodiment, in another optional embodiment, optionally, in the molten steel pouring process of peritectic high-strength automobile steel, the superheat degree of the molten steel in the tundish is controlled to be 20-35 ℃. The proper degree of superheat of the tundish contributes to improving the surface quality of the casting blank.
Based on the same inventive concept of the previous embodiment, in another alternative embodiment, the submerged nozzle below the tundish in the continuous casting process forms an included angle of 10-20 degrees with the horizontal direction optionally. Preferably the included angle is 10 °, 15 °, etc. Compared with the prior scheme, the casting powder can be better melted by reducing the inclination angle of the water gap in the horizontal direction (originally more than 20 degrees), the thickness of the liquid slag layer is ensured, and the uniformity of the liquid slag layer is improved.
Based on the same inventive concept of the previous embodiment, in another optional embodiment, the argon blowing amount of the stopper rod is 2-3L/min, the argon blowing amount of the upper nozzle is 2-3L/min, and the argon blowing amount of the plate between the plates is 2-5L/min, wherein the plate between the plates is an argon blowing device arranged in the middle of two refractory material planes of the upper nozzle and the lower nozzle.
Based on the same inventive concept of the foregoing embodiment, in another optional embodiment, optionally, the first preset weak cooling process specifically includes:
the control system of the continuous casting machine controls the wide-surface water flow of the crystallizer to be 3050-4250L/min, the narrow-surface water flow to be 390-610L/min, and the temperature difference between the cooling water inlet temperature and the cooling water outlet temperature of the crystallizer to be 8-11 ℃.
Based on the same inventive concept of the foregoing embodiment, in another optional embodiment, the optional high-frequency small-amplitude process specifically includes: the vibration frequency of the crystallizer is controlled to be 145-155 Hz, and the amplitude is controlled to be 5.5-6.5 mm.
In the cooling water of the crystallizer and the regular vibration of the crystallizer, the molten steel is solidified to form a blank shell with a certain thickness and gradually moves downwards. Proper vibration can obviously reduce the depth of vibration marks, reduce the frictional resistance between the blank shell and the wall of the crystallizer and improve the surface quality of the casting blank. According to the experimental tracking and data analysis of on-site casting, when the vibration frequency is 145-155 Hz and the amplitude is 5.5-6.5 mm, the casting blank has good quality, the demolding and pulling of the casting blank are facilitated, and the molten steel is gradually solidified into the aluminum-containing peritectic high-strength automobile steel plate blank with a certain rule size.
Based on the same inventive concept of the foregoing embodiment, in another optional embodiment, the optional second preset weak cooling process specifically includes:
and controlling the cooling water flow of the second cooling section of the continuous casting machine to be 0.4-0.6L/kg., and reducing the occurrence of casting blank cracks by adopting the water flow.
Based on the same inventive concept of the previous embodiment, in another optional embodiment, optionally, the continuous casting machine pulls out a casting blank containing aluminum peritectic high-strength automobile steel at a preset pulling speed, specifically comprising: when the section width of the casting blank is 1100-2150 mm, the continuous casting machine adopts a blank drawing speed of 0.8-1.2 m/min to draw the casting blank containing the aluminum peritectic high-strength automobile steel. So can guarantee the stability of casting blank and pull out, reduce surface defect.
The following describes the above scheme in detail with reference to specific implementation data:
based on the same inventive concept of the previous embodiment, in an optional embodiment, a certain mark of aluminum-containing peritectic high-strength automobile steel with the section of 230mm × 1400mm is cast, the superheat degree of tundish molten steel in the casting process is controlled at 25 ℃, the crystallizer is vibrated by high frequency and small amplitude, the vibration frequency is 150Hz, the amplitude is 6mm, and the weight percentage of all chemical components in the covering slag is Al2O3：1.45％，CaO：39.96％，SiO2：33.2％，F：10.24％，Na2O+K2O: 1.0-2.0%, MgO: 0.91%, C: 4-6%, and the balance of inevitable impurities, wherein CaO/SiO21.2, the wide-surface water flow of the crystallizer is 3080L/min, the narrow-surface water flow is 420L/min, the water temperature difference is controlled at 10 ℃, a 10-degree downward inclination angle water gap is adopted as a submerged nozzle, three paths of argon middle stopper rods and an upper water gap are adopted, the gas flow between plates is respectively 2.5L/min, 2.5L/min and 3L/min, the pulling speed is 0.9m/min, the two cold sections are cooled by two cold water, the cooling intensity of the two cold water is controlled at 0.5L/kg, and the two cold water are gradually solidified into a rule steel plate of an aluminum-containing peritectic high-strength automobile steel plate with a cross section of 237mm × 1400mm in certain size.
Based on the same inventive concept of the previous embodiment, the invention also provides aluminum-containing peritectic high-strength automobile steel, and the casting blank of the aluminum-containing peritectic high-strength automobile steel is manufactured by any one continuous casting method in the technical scheme.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a continuous casting method of aluminum-containing peritectic high-strength automobile steel, which comprises the steps of firstly adjusting a component system of casting powder to ensure that the alkalinity of the casting powder is CaO/SiO2The casting speed is controlled to be 1-1.4 in the casting process, so that the crystallization capacity of molten steel in a peritectic reaction can be improved, the conduction heat transfer is weakened, and the crack sensitivity of a primary casting shell of a casting blank is reduced; meanwhile, the adjustment of the components of the casting powder effectively reduces the melting point of the casting powder, controls the reasonable viscosity and improves the lubrication between the crystallizer and the casting blank; then, combining with the adjustment of a continuous casting process, avoiding water blocking in the casting process, reducing the heat flux density of a meniscus area of the crystallizer, and preventing the surface of a casting blank from generating cracks by adopting weak cooling in a secondary cooling section of continuous casting; and then the lubrication between the crystallizer and the casting blank is further improved by combining the high-frequency small-amplitude vibration of the crystallizer. Through the comprehensive effect of the means, the problem of continuous casting of the aluminum-containing peritectic high-strength automobile steel is effectively solved, the surface quality of the casting blank is obviously improved, the times of casting blank crack and bonding alarm are few, and the method can be widely applied to the aluminum-containing peritectic high-strength automobile steelAnd (4) stably casting strong automobile steel.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (9)
1. The continuous casting method of the aluminum-containing peritectic high-strength automobile steel is characterized by comprising the following steps of:
in the molten steel pouring process of the aluminum-containing peritectic high-strength automobile steel, three paths of argon blowing are carried out in the tundish, wherein the stopper rod, the water feeding port and the plates are opened;
the method comprises the following steps of carrying out protective casting by using crystallizer covering slag, wherein the crystallizer covering slag comprises the following chemical components in percentage by weight: al (Al)2O3：1.2％～1.6％，CaO：35％～45％，SiO2：30％～35％，F：8％～12％，Na2O+K2O: 1.0% -2.0%, MgO: 0.8% -1.0%, C: 4% -6%, the balance being impurities; alkalinity CaO/SiO of crystallizer casting powder in pouring process2In the range of 1.0 to 1.4;
the crystallizer adopts a first preset weak cooling process and a high-frequency small-amplitude process, wherein the first preset weak cooling process is used for controlling the heat flux density of a meniscus area of the crystallizer to be 1.0-2.0 MW m-2；
The continuous casting machine adopts a preset drawing speed to draw out the casting blank of the aluminum-containing peritectic high-strength automobile steel;
and the continuous casting secondary cooling section adopts a second preset weak cooling process.
2. The continuous casting method according to claim 1, further comprising: and in the molten steel pouring process of the peritectic high-strength automobile steel, controlling the superheat degree of the molten steel of the tundish to be 20-35 ℃.
3. The continuous casting method as claimed in claim 1, wherein the submerged entry nozzle below the tundish is inclined at an angle of 10 ° to 20 ° to the horizontal.
4. The continuous casting method according to claim 1, wherein the argon blowing amount at the stopper is 2 to 3L/min, the argon blowing amount at the water feeding port is 2 to 3L/min, and the argon blowing amount between the plates is 2 to 5L/min.
5. The continuous casting method according to claim 1, wherein the first predetermined weak cooling process specifically comprises:
controlling the water flow of the wide surface of the crystallizer to be 3050-4250L/min, controlling the water flow of the narrow surface of the crystallizer to be 390-610L/min, and controlling the temperature difference between the inlet water temperature and the outlet water temperature of the cooling water of the crystallizer to be 8-11 ℃.
6. The continuous casting method according to claim 1, wherein the high frequency small amplitude process specifically comprises:
the vibration frequency of the crystallizer is controlled to be 145-155 Hz, and the amplitude is controlled to be 5.5-6.5 mm.
7. The continuous casting method according to claim 1, wherein the second predetermined weak cooling process specifically comprises:
and controlling the flow of cooling water of the second cooling section of the continuous casting machine to be 0.4-0.6L/kg.
8. The continuous casting method according to claim 1, wherein the continuous casting machine draws the aluminum-containing peritectic high-strength automotive steel strand at a preset drawing speed, and specifically comprises:
when the section width of the casting blank is 1100-2150 mm, the continuous casting machine pulls out the casting blank containing the aluminum peritectic high-strength automobile steel at a blank pulling speed of 0.8-1.2 m/min.
9. An aluminum-containing peritectic high-strength automobile steel, which is characterized in that a casting blank of the aluminum-containing peritectic high-strength automobile steel is manufactured by the continuous casting method according to any one of claims 1 to 8.
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