CN104014754B - Method for producing high manganese steel through ultrasonic vibration crystallizer for continuous casting - Google Patents

Abstract

The invention discloses a method for producing high manganese steel through a continuous casting crystallizer adopting ultrasonic vibration, and belongs to the technical field of iron and steel metallurgy. The invention includes an electric furnace primary refining process, a ladle furnace refining process and a tundish slab continuous casting process. The tundish slab continuous casting process adopts a horizontal continuous casting system. The molten steel refined in the ladle furnace flows from the bottom of the ladle through the long The nozzle is injected into the tundish, and the molten steel in the tundish enters the horizontal continuous casting mold. At the same time, the ultrasonic vibration is generated on the horizontal continuous casting mold to gradually form the molten steel. After cooling in the secondary cooling section, it gradually solidifies into a continuous casting high manganese steel. In the present invention, there is no need to rely on the mechanical vibration of the crystallizer, but only rely on the ultrasonic vibration force to automatically "demould" the primary slab shell and the inner wall of the mold, thereby eliminating or reducing the occurrence of surface defects of the high manganese steel slab; at the same time, it can promote the casting slab The development of mesoaxial crystals improves the quality of subsequent metal products.

Description

A method for producing high manganese steel using a continuous casting crystallizer using ultrasonic vibration

technical field

The invention belongs to the technical field of iron and steel metallurgy, and more specifically relates to a method for producing high manganese steel using a continuous casting crystallizer using ultrasonic vibration.

Background technique

In the production process of high manganese steel, continuous casting equipment is generally used to obtain billets for transportation and subsequent use. The crystallizer is an important part of the continuous casting equipment, known as the "heart" of the continuous casting machine. During the continuous casting process, the molten steel is preliminarily solidified in the crystallizer to form a billet shell with a certain thickness, and at the same time, there is continuous relative motion between the molten steel (billet shell) and the mold, so that the billet pulled out from the mold not only has a certain thickness thickness, and ensure that the slab will not be broken under the combined action of mechanical stress and thermal stress, nor will it produce quality defects such as distortion and cracks. Therefore, the operation and design structure parameters of the crystallizer are very important to improve the quality of high manganese steel slab.

During the continuous casting of high manganese steel, the crystallizer is always vibrating. The purpose is to obtain good lubrication conditions for the inner wall of the mold, reduce the friction between the billet and the inner wall of the mold, and prevent the molten steel from sticking to the inner wall. However, due to The vibration of the crystallizer will form obvious vibration marks on the surface of the slab. The average depth of the vibration marks is 0.5mm, and the vibration marks are bent, and the depth of the vibration marks on the surface of some steel billets reaches 0.5-0.7mm. The reason for the formation of vibration marks on the surface of the slab is that during the period of negative slip, when the downward vibration speed of the slab is greater than the casting speed, the meniscus will be pushed into the molten steel by the positive pressure generated in the mold slag to form vibration marks. During positive slippage, when the strength of the initially solidified shell is not strong, the negative pressure formed in the mold flux and the inertial force of the fluctuating molten steel push the shell to the inner wall of the mold, causing the initial solidified shell to bend or overlap, forming a hookless shaped vibration marks. When the thickness of the initial solidified billet shell is large and the strength is high, the initial solidified billet shell cannot be pushed to the inner wall of the crystallizer, so the molten steel will cover the meniscus surface, forming a hook-shaped vibration mark. Some slabs have longitudinal depressions near the corners, the deepest reaches 3.5-4.0mm, and there is sticky slag in the depressions. The bottom of the vibration marks on the surface of the slab without modification is often accompanied by microcracks visible to the naked eye. After the microcracks are formed, the cracks can expand under the action of external factors.

The technical scheme of ultrasonic vibration applied to continuous casting crystallizer has been disclosed, such as Chinese patent application number: 201010251566.3, application date: 2010-08-05, the name of the invention is: a continuous casting crystallizer device using ultrasonic vibration, the The application discloses a continuous casting crystallizer device using ultrasonic vibration, the continuous casting crystallizer device includes a tundish, a crystallizer, a crystallizer copper plate, an ultrasonic waveguide, a transducer, an ultrasonic power supply, the crystallizer and The tundish is directly connected, and an ultrasonic waveguide is installed on each back of the copper plate of the crystallizer respectively. The ultrasonic waveguide is connected to a transducer, and the transducer is connected to an ultrasonic power supply through a cable. There are cooling water tanks around, and the ultrasonic waveguide is vertically connected to the crystallizer copper plate through the cooling water water tank. This application is one of the research results of the research group of the inventor of the present invention, which discloses the following technical means: the output power of the ultrasonic high-frequency pulse power supply per square meter of crystallizer copper plate is: 1000-10000W/ ^m2 , the frequency is 15 ~ 60KHz, the technical solution in the application is based on the experimental conclusions of the laboratory, but the technical solution in the application is found to be unsatisfactory in the industrial field test, especially for high manganese steel continuous casting During the process, the technical solution could not achieve the expected effect. The application guides continuous casting technicians to pay attention to the output power and frequency of each square meter of crystallizer copper plate in process control, but the patent application of the present invention subverts this design train of thought.

In addition, there are similar disclosures about the technical scheme of using ultrasonic technology to improve the solidification structure of cast slabs, such as Chinese patent application number: 200810023282.1, application date: 2008-04-07, and the name of the invention is: a direct introduction of ultrasonic waves into molten steel to improve steel quality The method of this application is: after the steel sample is melted at a set temperature, select a suitable ultrasonic tool head, and use the upper introduction method to directly introduce ultrasonic waves into molten steel for ultrasonic treatment. There is also a Chinese patent application number: 200510039030.4 for improving the solidification structure of the slab, and the application date is 2005-04-25. The name of the invention is: a method for controlling the solidification structure of the slab for a continuous casting machine. A method for controlling the solidification structure of a slab for a continuous casting machine is disclosed. An electrode is inserted into the molten steel in the mold or tundish of the continuous casting machine, and the electrode is connected to the negative pole of the high-frequency power output through a cable. The positive electrode of the high-frequency pulse power supply is connected to the steel structure foundation of the continuous casting machine with a cable. When the continuous casting machine is casting normally, turn on the high-frequency pulse power supply to adjust the output voltage, current and frequency of the high-frequency pulse power supply to a certain value. The high-frequency pulsed electric field begins to process the solidification structure of the continuous casting slab. These two applications are the results of research by the research group of the inventor of the patent for this invention in recent years, but how to simultaneously control the vibration marks formed on the surface of the high manganese steel slab and the solidification structure of the slab during the continuous casting process on the industrial site , this is a technical problem that has plagued the inventor for many years, and it is also a major problem that has plagued the application of ultrasonic technology to the continuous casting process.

Contents of the invention

1. The technical problem to be solved by the invention

The purpose of the present invention is to overcome the deficiencies in the prior art that high manganese steel is easy to form obvious vibration marks on the surface of the slab during continuous casting, and provides a method for producing high manganese steel using a continuous casting crystallizer that adopts ultrasonic vibrations. The technical solution can not only solve the vibration marks on the surface of the slab that appear in the continuous casting process of the high manganese steel in the industry, but also improve the solidification structure of the slab.

2. Technical solution

In order to achieve the above object, the technical scheme provided by the invention is:

A method for producing high manganese steel using a continuous casting crystallizer using ultrasonic vibration of the present invention comprises an electric furnace primary smelting process, a ladle furnace refining process and a tundish slab continuous casting process, and the tundish slab continuous casting process adopts a horizontal In the continuous casting system, the molten steel refined in the ladle furnace is injected into the tundish from the bottom of the ladle through the long nozzle, and the molten steel in the tundish enters the horizontal continuous casting mold, and the ultrasonic vibration is generated on the horizontal continuous casting mold to make The molten steel is gradually formed, and is gradually solidified into continuous casting high manganese steel through cooling in the secondary cooling section.

Furthermore, the mass percentages of the chemical components of molten high manganese steel after ladle furnace refining are: C, 0.56-0.66%; Si, 0.02-0.10%; Mn, 18.2-19.8%; P, ≤0.02%; S , ≤0.02%; N, 0.04～0.07%; Nb, 0.36～0.42%, the rest are Fe and unavoidable impurities;

The horizontal continuous casting system includes the bottom ultrasonic guide rod, the top ultrasonic guide rod, the first side ultrasonic guide rod, and the second side ultrasonic guide rod, among which:

The ultrasonic power used by the bottom ultrasonic guide rod is P1, P1=A×180W+35W,

The ultrasonic frequency used by the bottom ultrasonic guide rod is F1, F1=A×16KHz+8KHz;

In the formula: A is the ultrasonic coefficient, A=(C+Si)×100/0.5+Mn×100/10+Nb×100/2;

The ultrasonic power used by the top ultrasonic guide rod is P2, P2=P1×0.83,

The ultrasonic frequency used by the top ultrasonic guide rod is F2, F2=F1×0.94;

The ultrasonic power used by the ultrasonic guide rod on the first side and the ultrasonic guide rod on the second side is both P34, P34=P1×0.95,

The ultrasonic frequencies used by the first-side ultrasonic guide rod and the second-side ultrasonic guide rod are both F34, and F34=F1×1.02.

Furthermore, the structure of the horizontal continuous casting system is as follows: the side wall of the tundish is provided with a molten steel outlet, and the molten steel outlet is connected with the horizontal continuous casting mold, and the outer periphery of the horizontal continuous casting mold is provided with Mold cooling water tank, the above-mentioned horizontal continuous casting mold includes a copper plate at the bottom of the mold, a copper plate at the top of the mold, a copper plate on the first side of the mold, and a copper plate on the second side of the mold, the above-mentioned copper plate at the bottom of the mold, the copper plate at the top of the mold, the crystallizer The copper plate on the first side of the mold and the copper plate on the second side of the crystallizer form a rectangular crystallizer cavity, which is set horizontally, and one end of the crystallizer cavity is connected with the molten steel outlet on the side wall of the tundish. The other end of the cavity communicates with the external space;

The copper plate at the top of the crystallizer is inclined to the copper plate at the bottom of the mold, and the angle between the copper plate at the top of the crystallizer and the horizontal plane is 0.5°; The waveguide end of the crystallizer is in contact with the outer wall of the copper plate at the bottom of the crystallizer, and the other end of the bottom ultrasonic guide rod passes through the mold cooling water tank; the outer wall of the top copper plate of the crystallizer is provided with a top ultrasonic guide rod, and the top ultrasonic guide rod The waveguide end is in contact with the outer wall of the top copper plate of the crystallizer, and the other end of the top ultrasonic guide rod passes through the mold cooling water tank; the outer wall of the copper plate on the first side of the crystallizer is provided with a first side ultrasonic guide rod, which The waveguide end of the first side ultrasonic guiding rod is in contact with the outer wall of the copper plate on the first side of the crystallizer, and the other end of the first side ultrasonic guiding rod passes through the crystallizer cooling water tank; the outer wall of the second side copper plate of the crystallizer A second side ultrasonic guide rod is provided, the waveguide end of the second side ultrasonic guide rod is in contact with the outer wall of the second side copper plate of the crystallizer, and the other end of the second side ultrasonic guide rod passes through the crystallizer cooling water tank; the above The bottom ultrasonic guiding rod, the top ultrasonic guiding rod, the first side ultrasonic guiding rod and the second side ultrasonic guiding rod are respectively connected with their respective transducers, and the transducers are connected with their respective ultrasonic power sources through cables.

Preferably, the cooling of the bottom ultrasonic guiding rod, the top ultrasonic guiding rod, the first side ultrasonic guiding rod and the second side ultrasonic guiding rod is performed by cooling water in the crystallizer cooling water tank.

Preferably, the bottom ultrasonic guiding rod, the top ultrasonic guiding rod, the first side ultrasonic guiding rod, and the second side ultrasonic guiding rod are respectively in contact with the bottom copper plate of the crystallizer, the top copper plate of the crystallizer, and the first side copper plate of the crystallizer. , The copper plate on the second side of the crystallizer is in vertical contact with each other.

Preferably, the lengths of the bottom ultrasonic guiding rod, the top ultrasonic guiding rod, the first side ultrasonic guiding rod and the second side ultrasonic guiding rod are integer multiples or half wavelengths of the ultrasonic waves used respectively.

Preferably, the bottom ultrasonic guiding rod, the top ultrasonic guiding rod, the first side ultrasonic guiding rod and the second side ultrasonic guiding rod are made of aluminum-magnesium alloy or titanium alloy.

3. Beneficial effect

Compared with the prior art, the technical solution provided by the invention has the following remarkable effects:

The invention adopts a horizontal continuous casting crystallizer in the continuous casting process of high manganese steel, and generates ultrasonic vibrations on the horizontal continuous casting crystallizer, and the waveguide rods on the four side walls of the horizontal continuous casting crystallizer adopt specific power and frequency, so that Ultrasonic vibration is applied to the side wall of the horizontal continuous casting mold to generate a tension between the inner wall of the horizontal continuous casting mold and the primary shell, without relying on the mechanical vibration of the mold, but only relying on the ultrasonic vibration force to make the primary shell and The inner wall of the mold is automatically "demolded", thereby eliminating or reducing the occurrence of surface defects of the high manganese steel slab; the ultrasonic waves applied on the side wall of the mold can also directly penetrate into the interior of the high manganese steel slab, so that the interior of the slab has just crystallized The formed metal dendrites fracture, thereby forming a large number of heterogeneous nucleation cores inside the slab, promoting the development of equiaxed crystals in the slab, and improving the quality of subsequent metal products. The invention enables the successful use of the ultrasonic vibration type crystallizer in the industrial field, which will definitely promote the research on new technology of continuous casting, promote the development of horizontal continuous casting technology, reduce the height of continuous casting machine, save a lot of investment, and promote the development of continuous casting technology. is of great significance.

Description of drawings

Fig. 1 is the structural representation of horizontal continuous casting system among the present invention;

Fig. 2 is a schematic cross-sectional structure diagram of the horizontal continuous casting crystallizer in the present invention.

Explanation of the labels in the schematic diagram: 1. Ladle; Guide rod; 54, ultrasonic guiding rod on the second side; 61, copper plate at the bottom of the mold; 62, copper plate at the top of the mold; 63, copper plate on the first side of the mold; 64, copper plate on the second side of the mold.

detailed description

In order to further understand the content of the present invention, the present invention will be described in detail in conjunction with the accompanying drawings and embodiments.

Example 1

Referring to Fig. 1 and Fig. 2, a method for producing high manganese steel using a continuous casting mold using ultrasonic vibration in this embodiment includes an electric furnace primary smelting process, a ladle furnace refining process and a tundish slab continuous casting process. Wherein: the mass percent of the chemical composition of the high manganese molten steel after ladle furnace refining can be as follows: C, 0.56-0.66%; Si, 0.02-0.10%; Mn, 18.2-19.8%; P, ≤0.02%; S , ≤0.02%; N, 0.04-0.07%; Nb, 0.36-0.42%, and the rest are Fe and unavoidable impurities. The composition of the high manganese steel used in the present invention is beneficial to the purpose of eliminating or reducing the surface defects of the high manganese steel billet through ultrasonic treatment in the continuous casting process, especially the composition control of Mn and Nb therein. Specifically in the present embodiment, the mass percent of the chemical composition of molten steel after refining is: C, 0.61%; Si, 0.06%; Mn, 18.9%; P, 0.02%; S, 0.02%; N, 0.06%; %, the rest is Fe and unavoidable impurities.

The tundish slab continuous casting process in this embodiment adopts a horizontal continuous casting system, and the structure of the horizontal continuous casting system is as follows: a side wall of the tundish 2 is provided with a molten steel outlet, and the molten steel outlet is connected to the horizontal continuous casting mold 3 In connection with each other, the outer periphery of the horizontal continuous casting mold 3 is provided with a mold cooling water tank 4, and the above-mentioned horizontal continuous casting mold 3 includes a copper plate 61 at the bottom of the mold, a copper plate 62 at the top of the mold, and a copper plate 63 at the first side of the mold And crystallizer second side copper plate 64, above-mentioned crystallizer bottom copper plate 61, crystallizer top copper plate 62, crystallizer first side copper plate 63, crystallizer second side copper plate 64 surround the crystallizer cavity of rectangle, this crystallizer The inner cavity is arranged horizontally, one end of the crystallizer inner cavity communicates with the molten steel outlet on the side wall of the tundish 2, and the other end of the crystallizer inner cavity communicates with the external space.

The top copper plate 62 of the crystallizer is inclined to the copper plate 61 at the bottom of the crystallizer. The angle between the copper plate 62 on the top of the crystallizer and the horizontal plane is 0.5°. In the present invention, the copper plate 62 on the top of the crystallizer is designed to be at a certain angle with the horizontal plane because the molten steel is solidifying Shrinkage will occur during the process, and it will automatically separate from the top copper plate 62 of the crystallizer under the action of its own gravity. If the copper plate 62 on the top of the crystallizer does not tilt at a certain angle to the copper plate 61 at the bottom of the crystallizer, it will be difficult to guide the ultrasonic wave from the top ultrasonic guide rod 52 to the inside of the horizontal continuous casting mold 3, resulting in the uncontrollable ultrasonic process parameters on the upper side wall of the horizontal continuous casting mold 3. As shown in Figure 2, the outer wall of the bottom copper plate 61 of the crystallizer is provided with a bottom ultrasonic guiding rod 51, the wave guiding end of the bottom ultrasonic guiding rod 51 is in contact with the outer wall of the bottom copper plate 61 of the crystallizer, and the other end of the bottom ultrasonic guiding rod 51 One end passes through the crystallizer cooling water tank 4; the outer wall of the top copper plate 62 of the crystallizer is provided with a top ultrasonic guide rod 52, and the waveguide end of the top ultrasonic guide rod 52 is in contact with the outer wall of the top copper plate 62 of the crystallizer. The other end of the ultrasonic guide rod 52 passes through the crystallizer cooling water tank 4; the outer wall of the first side copper plate 63 of the crystallizer is provided with a first side ultrasonic guide rod 53, and the waveguide end of the first side ultrasonic guide rod 53 is connected to the The outer wall of the copper plate 63 on the first side of the crystallizer is in contact, and the other end of the first side ultrasonic guide rod 53 passes through the cooling water tank 4 of the crystallizer; the outer wall of the second side copper plate 64 of the crystallizer is provided with a second ultrasonic guide Rod 54, the waveguide end of the second side ultrasonic guiding rod 54 is in contact with the outer wall of the second side copper plate 64 of the crystallizer, and the other end of the second side ultrasonic guiding rod 54 passes through the crystallizer cooling water tank 4; the above-mentioned bottom The ultrasonic guiding rod 51 , the top ultrasonic guiding rod 52 , the first side ultrasonic guiding rod 53 , and the second side ultrasonic guiding rod 54 are respectively connected with respective transducers, and the transducers are connected with respective ultrasonic power sources through cables. In order to properly cool the waveguiding rods, the cooling of the bottom ultrasonic guiding rod 51, the top ultrasonic guiding rod 52, the first side ultrasonic guiding rod 53 and the second side ultrasonic guiding rod 54 in this embodiment adopts the crystallizer cooling water tank 4 cooling water inside. In addition, the bottom ultrasonic guiding rod 51, the top ultrasonic guiding rod 52, the first side ultrasonic guiding rod 53, and the second side ultrasonic guiding rod 54 in this embodiment are respectively in contact with the mold bottom copper plate 61 and the mold top copper plate 62. , the copper plate 63 on the first side of the crystallizer, and the copper plate 64 on the second side of the crystallizer are in vertical contact; the lengths of the bottom ultrasonic guiding rod 51, the top ultrasonic guiding rod 52, the first side ultrasonic guiding rod 53, and the second side ultrasonic guiding rod 54 are Integer multiples of the ultrasonic wavelengths or half-wavelengths used respectively; the material of the bottom ultrasonic guiding rod 51 , the top ultrasonic guiding rod 52 , the first side ultrasonic guiding rod 53 , and the second side ultrasonic guiding rod 54 is titanium alloy.

In the tundish slab continuous casting process, the molten steel refined in the ladle furnace flows from the bottom of the ladle 1 through the long nozzle and is injected into the tundish 2, and the molten steel in the tundish 2 enters the horizontal continuous casting mold 3, and at the same time Ultrasonic vibrations are generated on the continuous casting crystallizer 3 to gradually shape the molten steel, and after cooling in the secondary cooling section, it is gradually solidified into continuous casting high manganese steel. The mass percent of the chemical composition of molten steel after refining in the present embodiment is: C, 0.61%; Si, 0.06%; Mn, 18.9%; P, 0.02%; S, 0.02%; N, 0.06%; The rest is Fe and unavoidable impurities. Therefore, A is the ultrasonic coefficient, A=(C+Si)×100/0.5+Mn×100/10+Nb×100/2=(0.61+0.06)/0.5+18.9/10+0.38/2=3.42, by This can be obtained:

The ultrasonic power used by the bottom ultrasonic guiding rod 51 is P1, P1=A×180W+35W=650W,

The ultrasonic frequency used by the bottom ultrasonic guiding rod 51 is F1, F1=A×16KHz+8KHz=63KHz;

The ultrasonic power used by the top ultrasonic guiding rod 52 is P2, P2=P1×0.83=540W,

The ultrasonic frequency used by the top ultrasonic guiding rod 52 is F2, F2=F1×0.94=59KHz;

The ultrasonic power used by the first side ultrasonic guiding rod 53 and the second side ultrasonic guiding rod 54 is both P34, P34=P1×0.95=618W,

The ultrasonic frequencies used by the first-side ultrasonic guide rod 53 and the second-side ultrasonic guide rod 54 are both F34, and F34=F1×1.02=64KHz.

When the continuous casting machine is pouring normally, turn on the ultrasonic power supply, adjust the ultrasonic output power and frequency to the value calculated in this embodiment, the bottom ultrasonic guiding rod 51, the top ultrasonic guiding rod 52, the first side ultrasonic guiding rod 53, the second ultrasonic guiding rod The side ultrasonic guide rod 54 can produce a strong impact on the side wall of the horizontal continuous casting mold 3, eliminating the bonding between the molten steel solidified slab shell and the inner wall in the horizontal continuous casting mold 3, and forming a large number of slabs inside the slab. Heterogeneous nucleation cores that promote the development of equiaxed grains in the slab. After the high manganese steel slab in this embodiment exits the horizontal continuous casting crystallizer 3, spray cooling water on the high manganese steel slab for forced rapid cooling, and after all the molten steel in the tundish 2 is pulled into a steel slab, the end pouring.

As we all know, in order to reduce the defects caused by mold vibration to high manganese steel slabs, improve the surface quality of slabs, and reduce the depth of vibration marks, people have been conducting in-depth and meticulous research on mold vibration. However, the improvement of the vibration mode of the crystallizer cannot solve the inherent vibration defects of the slab, so people have been constantly developing new structures of the crystallizer. The horizontal continuous casting crystallizer 3 based on the ultrasonic vibration type proposed by the present invention has broken through the limitation of traditional mechanical vibration. The present invention has determined the specific calculation method of the ultrasonic coefficient through the analysis and summary of a large number of experimental data, and from the horizontal continuous casting crystallizer Each side wall of 3 comprehensively controls the ultrasonic process parameters, which is a new crystallizer vibration technology that applies ultrasonic vibration to industrial continuous casting production. It is conducive to promoting the production of defect-free continuous casting slabs without surface defects such as vibration marks. In addition, the ultrasonic waves applied on the side wall of the horizontal continuous casting crystallizer 3 can also directly penetrate into the interior of the high manganese steel slab, causing the metal dendrites just crystallized inside the slab to break, thereby forming a large number of heterogeneous particles inside the slab. The nucleation core promotes the development of equiaxed crystals in the slab, thereby improving the quality of subsequent metal products. The high manganese steel casting slab of this embodiment is tested for surface defects, almost no vibration marks are found, and the solidification structure is improved to improve the quality of the casting slab.

Example 2

A kind of method that adopts the continuous casting crystallizer of ultrasonic vibration of present embodiment to produce high manganese steel, its step is the same as embodiment 1, and difference is:

The mass percent of the chemical composition of molten steel after refining in the present embodiment is: C, 0.56%; Si, 0.10%; Mn, 18.2%; P, 0.01%; S, 0.02%; N, 0.04%; The rest is Fe and unavoidable impurities. Therefore, A is the ultrasonic coefficient, A=(C+Si)×100/0.5+Mn×100/10+Nb×100/2=3.35, thus:

The ultrasonic power used by the bottom ultrasonic guiding rod 51 is P1, P1=A×180W+35W=638W,

The ultrasonic frequency used by the bottom ultrasonic guiding rod 51 is F1, F1=A×16KHz+8KHz=62KHz;

The ultrasonic power used by the top ultrasonic guiding rod 52 is P2, P2=P1×0.83=529W,

The ultrasonic frequency used by the top ultrasonic guiding rod 52 is F2, F2=F1×0.94=58KHz;

The ultrasonic power used by the first side ultrasonic guiding rod 53 and the second side ultrasonic guiding rod 54 is both P34, P34=P1×0.95=606W,

The ultrasonic frequencies used by the first-side ultrasonic guide rod 53 and the second-side ultrasonic guide rod 54 are both F34, and F34=F1×1.02=63KHz.

The high manganese steel slab of this embodiment is tested for surface defects, almost no vibration marks are found, and the solidification structure is improved to improve the quality of the slab.

Example 3

A kind of method that adopts the continuous casting crystallizer of ultrasonic vibration of present embodiment to produce high manganese steel, its step is the same as embodiment 1, and difference is:

The mass percent of the chemical composition of molten steel after refining in the present embodiment is: C, 0.66%; Si, 0.02%; Mn, 19.8%; P, 0.02%; S, 0.01%; N, 0.07%; The rest is Fe and unavoidable impurities. Therefore, A is the ultrasonic coefficient, A=(C+Si)×100/0.5+Mn×100/10+Nb×100/2=3.52, thus:

The ultrasonic power used by the bottom ultrasonic guiding rod 51 is P1, P1=A×180W+35W=669W,

The ultrasonic frequency used by the bottom ultrasonic guiding rod 51 is F1, F1=A×16KHz+8KHz=64KHz;

The ultrasonic power used by the top ultrasonic guiding rod 52 is P2, P2=P1×0.83=555W,

The ultrasonic frequency used by the top ultrasonic guiding rod 52 is F2, F2=F1×0.94=60KHz;

The ultrasonic power used by the first side ultrasonic guiding rod 53 and the second side ultrasonic guiding rod 54 is both P34, P34=P1×0.95=635W,

The ultrasonic frequencies used by the first-side ultrasonic guide rod 53 and the second-side ultrasonic guide rod 54 are both F34, and F34=F1×1.02=65KHz.

The high manganese steel slab of this embodiment is tested for surface defects, almost no vibration marks are found, and the solidification structure is improved to improve the quality of the slab.

Claims (6)

1. a method for producing high manganese steel by a continuous casting crystallizer adopting ultrasonic vibration, comprising electric furnace preliminary refining process, ladle furnace refining process and tundish slab continuous casting process, is characterized in that: The tundish slab continuous casting process adopts a horizontal continuous casting system. The molten steel refined in the ladle furnace is injected into the tundish (2) from the bottom of the ladle (1) through the long nozzle, and the steel in the tundish (2) The molten steel enters the horizontal continuous casting crystallizer (3), and at the same time, ultrasonic vibrations are generated on the horizontal continuous casting mold (3) to gradually shape the molten steel, and after cooling in the secondary cooling section, it gradually solidifies into continuous casting high manganese steel; The mass percentages of the chemical composition of the high manganese molten steel after ladle furnace refining are: C, 0.56-0.66%; Si, 0.02-0.10%; Mn, 18.2-19.8%; P, ≤0.02%; S, ≤0.02%; N, 0.04～0.07%; Nb, 0.36～0.42%, the rest is Fe and unavoidable impurities; The horizontal continuous casting system includes a bottom ultrasonic guide rod (51), a top ultrasonic guide rod (52), a first side ultrasonic guide rod (53), and a second side ultrasonic guide rod (54), wherein: The ultrasonic power used by the bottom ultrasonic guiding rod (51) is P1, P1=A×180W+35W, The ultrasonic frequency used by the bottom ultrasonic guiding rod (51) is F1, F1=A×16KHz+8KHz; In the formula: A is the ultrasonic coefficient, A=(C+Si)×100/0.5+Mn×100/10+Nb×100/2; The ultrasonic power used by the top ultrasonic guiding rod (52) is P2, P2=P1×0.83, The ultrasonic frequency used by the top ultrasonic guiding rod (52) is F2, F2=F1×0.94; The ultrasonic power used by the first side ultrasonic guiding rod (53) and the second side ultrasonic guiding rod (54) are both P34, P34=P1×0.95, The ultrasonic frequencies used by the first-side ultrasonic guide rod (53) and the second-side ultrasonic guide rod (54) are both F34, and F34=F1×1.02. 2. A method for producing high manganese steel using a continuous casting mold of ultrasonic vibration according to claim 1, characterized in that, the structure of the horizontal continuous casting system is as follows: a side wall of the tundish (2) is opened There is a molten steel outlet, and the molten steel outlet is connected with the horizontal continuous casting mold (3), and the outer periphery of the horizontal continuous casting mold (3) is provided with a crystallizer cooling water tank (4), and the above-mentioned horizontal continuous casting mold ( 3) Including crystallizer bottom copper plate (61), crystallizer top copper plate (62), crystallizer first side copper plate (63) and crystallizer second side copper plate (64), above-mentioned crystallizer bottom copper plate (61), crystallization The copper plate (62) on the top of the crystallizer, the copper plate (63) on the first side of the crystallizer, and the copper plate (64) on the second side of the crystallizer form a rectangular crystallizer cavity. The crystallizer cavity is horizontally arranged, and one end of the crystallizer cavity It is connected with the molten steel outlet on the side wall of the tundish (2), and the other end of the crystallizer cavity is connected with the external space; The copper plate at the top of the crystallizer (62) is inclined to the copper plate at the bottom of the crystallizer (61), and the angle between the copper plate at the top of the crystallizer (62) and the horizontal plane is 0.5°; the outer wall of the copper plate at the bottom of the crystallizer (61) A bottom ultrasonic guiding rod (51) is provided, the waveguide end of the bottom ultrasonic guiding rod (51) is in contact with the outer wall of the copper plate (61) at the bottom of the crystallizer, and the other end of the bottom ultrasonic guiding rod (51) passes through the crystallizer Cooling water tank (4); the outer wall of the top copper plate (62) of the crystallizer is provided with a top ultrasonic guide rod (52), and the waveguide end of the top ultrasonic guide rod (52) is connected to the outer wall of the top copper plate (62) of the crystallizer. In contact with each other, the other end of the top ultrasonic guide rod (52) passes through the crystallizer cooling water tank (4); the outer wall of the first side copper plate (63) of the crystallizer is provided with a first side ultrasonic guide rod (53), The waveguide end of the first side ultrasonic guide rod (53) is in contact with the outer wall of the first side copper plate (63) of the crystallizer, and the other end of the first side ultrasonic guide rod (53) passes through the crystallizer cooling water tank (4 ); the outer wall of the second side copper plate (64) of the crystallizer is provided with a second side ultrasonic guide rod (54), and the waveguide end of the second side ultrasonic guide rod (54) is connected to the second side copper plate of the crystallizer ( 64) The outer side walls are in contact, and the other end of the second side ultrasonic guiding rod (54) passes through the crystallizer cooling water tank (4); the above-mentioned bottom ultrasonic guiding rod (51), top ultrasonic guiding rod (52), first The side ultrasonic guiding rod (53) and the second lateral ultrasonic guiding rod (54) are respectively connected with respective transducers, and the transducers are connected with respective ultrasonic power sources through cables. 3. a kind of method that adopts the continuous casting mold of ultrasonic vibration to produce high manganese steel according to claim 2, is characterized in that: described bottom ultrasonic guiding rod (51), top ultrasonic guiding rod (52), the first The cooling of the ultrasonic guiding rod (53) on one side and the ultrasonic guiding rod (54) on the second side adopts the cooling water in the crystallizer cooling water tank (4) for cooling. 4. a kind of method that adopts the continuous casting mold of ultrasonic vibration to produce high manganese steel according to claim 2, is characterized in that: described bottom ultrasonic guiding rod (51), top ultrasonic guiding rod (52), the first One side of the ultrasonic guiding rod (53) and the second side of the ultrasonic guiding rod (54) are in contact with the bottom copper plate (61) of the mold, the copper plate (62) at the top of the mold, the first copper plate (63) of the crystallizer, and the crystallizer The copper plate (64) on the second side of the device is in vertical contact. 5. A method for producing high manganese steel in a continuous casting mold using ultrasonic vibration according to claim 3 or 4, characterized in that: the bottom ultrasonic guiding rod (51), the top ultrasonic guiding rod (52) , The lengths of the first-side ultrasonic guiding rod (53) and the second-side ultrasonic guiding rod (54) are integer multiples or half-wavelengths of the ultrasonic waves used respectively. 6. a kind of method that adopts the continuous casting mold of ultrasonic vibration to produce high manganese steel according to claim 5, is characterized in that: described bottom ultrasonic guiding rod (51), top ultrasonic guiding rod (52), the first The material of the ultrasonic guiding rod (53) on one side and the ultrasonic guiding rod (54) on the second side is aluminum-magnesium alloy or titanium alloy.