Method and device for distinguishing molten steel treatment process

Abstract

The present application discloses a method and device for distinguishing a molten steel treatment process, the method comprising: obtaining the temperature of the molten steel at the arrival station, the oxygen content of the molten steel at the arrival station, the temperature of the molten steel at the arrival station, the liquidus temperature of the steel grade, and the liquidus temperature of the pure iron, the temperature of the molten steel at the arrival station being the temperature of the molten steel at the arrival station when the RH furnace is evacuated, obtaining a preset temperature, the preset temperature being one of the preset temperature of the steel grade and the preset temperature of the pure iron, selecting the preset temperature according to the oxygen content of the molten steel at the arrival station, comparing the preset temperature with the temperature of the molten steel at the arrival station, obtaining a comparison result, and judging whether it is suitable to adopt the RH vacuum treatment production process to perform secondary refining on the molten steel at the arrival station according to the comparison result. The present application can judge whether it is suitable to adopt the RH vacuum treatment production process to perform secondary refining on the molten steel at the arrival station by comparing the preset temperature with the temperature of the molten steel at the arrival station.

Description

Technical Field

[0001] The invention relates to the technical field of molten steel treatment, and in particular to a method and device for distinguishing a molten steel treatment process. Background Art

[0002] RH furnace refers to RH vacuum circulating degassing refining furnace, which mainly includes upper tank, middle tank, lower tank and immersion tube. It adopts RH vacuum treatment production process to carry out secondary refining of molten steel arriving at the station.

[0003] At present, the existing steel enterprises adopt the RH vacuum treatment production process. When the molten steel is subjected to secondary refining at the station, either the temperature of the molten steel at the station is not restricted, or a fixed temperature value is used as the lower limit of the temperature of the molten steel at the station. Since the liquidus temperature of different steel grades is different, the latter is not suitable for all steel grades. In summary, the above treatment method does not effectively restrict the temperature of the molten steel at the station, and it is difficult to avoid the solidification of the molten steel, which causes the molten steel to block the immersion tube and adhere to the ladle, which is not conducive to the smooth and stable refining production.

[0004] Therefore, there is an urgent need for a method for distinguishing the molten steel treatment process to determine whether the molten steel arriving at the station is suitable for the RH vacuum treatment production process. Summary of the invention

[0005] The embodiments of the present application provide a method and device for distinguishing a molten steel treatment process, which can distinguish whether the molten steel arriving at the station is suitable for the RH vacuum treatment production process based on the temperature of the molten steel arriving at the station.

[0006] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0007] According to a first aspect of an embodiment of the present application, a method for distinguishing a molten steel treatment process is provided, comprising:

[0008] Obtaining the temperature of the molten steel at the station, the oxygen content of the molten steel at the station, the lowered temperature of the molten steel at the station, the liquidus temperature of the steel grade, and the liquidus temperature of the pure iron, wherein the lowered temperature of the molten steel at the station is the temperature at which the molten steel at the station is lowered when the RH furnace is evacuated;

[0009] Obtaining a preset temperature, wherein the preset temperature is one of a steel grade preset temperature and a pure iron preset temperature, wherein the steel grade preset temperature is obtained according to the steel grade liquidus temperature and the temperature reduction of the molten steel at the station, and the pure iron preset temperature is obtained according to the pure iron liquidus temperature and the temperature reduction of the molten steel at the station;

[0010] According to the oxygen content of the molten steel at the station, a preset temperature is selected, and the preset temperature is compared with the temperature of the molten steel at the station to obtain a comparison result;

[0011] Based on the comparison results, determine whether it is suitable to use the RH vacuum treatment production process to carry out secondary refining of the molten steel arriving at the station.

[0012] In some embodiments of the present application, based on the above scheme, the preset temperature of the steel grade is obtained according to the liquidus temperature of the steel grade and the lowering temperature of the molten steel at the station, including:

[0013] Calculate the preset temperature of the steel grade according to the following formula:

[0014] T gy =T g +T j , where T gy Preset temperature for steel grade, T g is the liquidus temperature of the steel grade, T j To lower the temperature of molten steel arriving at the station.

[0015] In some embodiments of the present application, based on the above scheme, the preset temperature of pure iron is obtained according to the liquidus temperature of pure iron and the lowering temperature of molten steel at the station, including:

[0016] Calculate the preset temperature of the steel grade according to the following formula:

[0017] T cy =T c +T j , where T cy Preset temperature for pure iron, T c is the liquidus temperature of pure iron, T j To lower the temperature of molten steel arriving at the station.

[0018] In some embodiments of the present application, based on the above scheme, the preset temperature is selected according to the oxygen content of the molten steel at the station, including:

[0019] Obtain the preset oxygen content of the molten steel arriving at the station;

[0020] Compare the oxygen content of the molten steel arriving at the station with the preset oxygen content of the molten steel arriving at the station, and select the preset temperature.

[0021] In some embodiments of the present application, based on the above scheme, the step of comparing the oxygen content of the molten steel at the arrival station with the preset oxygen content of the molten steel at the arrival station and selecting the preset temperature includes:

[0022] When the oxygen content of the molten steel arriving at the station is greater than the preset oxygen content of the molten steel arriving at the station, the preset temperature of pure iron is selected as the preset temperature;

[0023] When the oxygen content of the molten steel arriving at the station is less than or equal to the preset oxygen content of the molten steel arriving at the station, the preset temperature of the steel grade is selected as the preset temperature.

[0024] In some embodiments of the present application, based on the above scheme, judging whether it is suitable to use the RH vacuum treatment production process to perform secondary refining on the molten steel at the station according to the comparison result includes:

[0025] When the comparison result shows that the preset temperature is lower than the temperature of the molten steel at the station, it is suitable to adopt the RH vacuum treatment production process to perform secondary refining on the molten steel at the station;

[0026] When the comparison result shows that the preset temperature is greater than or equal to the temperature of the molten steel at the station, it is not suitable to use the RH vacuum treatment production process to perform secondary refining on the molten steel at the station.

[0027] In some embodiments of the present application, based on the above scheme, the step of obtaining the temperature of the molten steel at the station and the oxygen content of the molten steel at the station includes:

[0028] Use temperature probe to detect the molten steel at the station and get the temperature of the molten steel at the station;

[0029] The oxygen content of the molten steel at the station is obtained by using an oxygen probe to detect the molten steel at the station.

[0030] In some embodiments of the present application, based on the above solution, the step of obtaining the lowered temperature of the molten steel at the station includes:

[0031] Get the preset time;

[0032] Before the RH furnace is evacuated, the temperature of the molten steel at the station is detected to obtain the pre-vacuum temperature;

[0033] The RH furnace starts to evacuate the vacuum chamber. After a preset time, the temperature of the molten steel at the station is detected again to obtain the post-vacuum temperature.

[0034] According to the temperature before vacuum and the temperature after vacuum, the lowered temperature of the molten steel at the arrival station is obtained.

[0035] In some embodiments of the present application, based on the above scheme, obtaining the liquidus temperature of the steel grade and the liquidus temperature of the pure iron includes:

[0036] According to the liquidus calculation formula, the liquidus temperature of the steel grade and the liquidus temperature of pure iron are calculated.

[0037] In some embodiments of the present application, a preset temperature is selected according to the oxygen content of the molten steel at the arrival station, and the preset temperature is compared with the temperature of the molten steel at the arrival station to obtain a comparison result. If the preset temperature is less than the latter, it is suitable to adopt the RH vacuum treatment production process, and subsequent operations such as oxygen blowing and heating can be performed. If the preset temperature is greater than or equal to the latter, it is not suitable to adopt the RH vacuum treatment production process, and transfer station treatment or re-melting treatment is required.

[0038] According to a second aspect of an embodiment of the present application, a device for distinguishing a molten steel treatment process is provided, comprising:

[0039] An acquisition unit is used to acquire the temperature of the molten steel at the station, the oxygen content of the molten steel at the station, the lowered temperature of the molten steel at the station, the liquidus temperature of the steel grade, and the liquidus temperature of the pure iron. The lowered temperature of the molten steel at the station is the temperature at which the molten steel at the station is lowered when the RH furnace is vacuumed;

[0040] Obtaining a unit, obtaining a preset temperature, wherein the preset temperature is one of a steel grade preset temperature and a pure iron preset temperature, wherein the steel grade preset temperature is obtained according to the steel grade liquidus temperature and the temperature reduction of the molten steel at the station, and the pure iron preset temperature is obtained according to the pure iron liquidus temperature and the temperature reduction of the molten steel at the station;

[0041] A comparison unit selects a preset temperature according to the oxygen content of the molten steel at the station, compares the preset temperature with the temperature of the molten steel at the station, and obtains a comparison result;

[0042] The judging unit judges whether it is suitable to adopt the RH vacuum treatment production process to carry out secondary refining of the molten steel at the station according to the comparison result.

[0043] The beneficial effects of each embodiment of the second aspect mentioned above can refer to the beneficial effects of the first aspect and each embodiment of the first aspect mentioned above, and will not be repeated here.

[0044] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0046] Figure 1 A flow chart showing a method for distinguishing a molten steel treatment process in an embodiment of the present application is shown;

[0047] Figure 2 A block diagram of a molten steel treatment process identification device in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0048] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0049] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0050] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0051] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0052] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0054] Figure 1 A flow chart of a method for distinguishing a molten steel treatment process in an embodiment of the present application is shown, and the method for distinguishing a molten steel treatment process can be executed by a device with a computing and processing function.

[0055] Reference Figure 1 As shown, the method for distinguishing the molten steel treatment process includes at least steps S1 to S4, which are described in detail as follows:

[0056] In step S1, the temperature of the molten steel at the arrival station, the oxygen content of the molten steel at the arrival station, the lowered temperature of the molten steel at the arrival station, the liquidus temperature of the steel grade and the liquidus temperature of pure iron are obtained. The lowered temperature of the molten steel at the arrival station is the temperature of the molten steel at the arrival station when the RH furnace is vacuumed.

[0057] In the present application, the molten steel arriving at the station can be the molten steel arriving at the refining station, that is, the molten steel arriving at the RH vacuum treatment production process. The temperature of the molten steel arriving at the station can be obtained by detecting the molten steel at the station using a temperature measuring probe. The oxygen content of the molten steel arriving at the station can be obtained by detecting the molten steel at the station using an oxygen measurement probe. The liquidus temperature of the steel grade and the liquidus temperature of pure iron can be calculated using the liquidus calculation formula.

[0058] In step S2, a preset temperature is obtained, which is one of a steel grade preset temperature and a pure iron preset temperature. The steel grade preset temperature is obtained based on the steel grade liquidus temperature and the reduced temperature of the molten steel at the station. The pure iron preset temperature is obtained based on the pure iron liquidus temperature and the reduced temperature of the molten steel at the station.

[0059] In step S3, a preset temperature is selected according to the oxygen content of the molten steel arriving at the station, and the preset temperature is compared with the temperature of the molten steel arriving at the station to obtain a comparison result.

[0060] In the present application, according to the oxygen content of the molten steel arriving at the station, one of the steel grade preset temperature and the pure iron preset temperature is selected as the preset temperature, and then the selected preset temperature is compared with the molten steel temperature at the station to obtain a comparison result between the two.

[0061] In step S4, based on the comparison result, it is determined whether it is suitable to adopt the RH vacuum treatment production process to perform secondary refining on the molten steel arriving at the station.

[0062] In the present application, the preset temperature and the temperature of the molten steel at the arrival station can be compared as the comparison result, or a standard value can be set to calculate the ratio of the preset temperature and the temperature of the molten steel at the arrival station, and the calculated ratio can be compared with the standard value as the comparison result. The standard value can be set according to actual conditions or according to experience, and there is no limitation here.

[0063] Specifically, the preset temperature of the steel grade can be calculated according to the following formula:

[0064] T gy =T g +T j , where T gy Preset temperature for steel grade, T g is the liquidus temperature of the steel grade, T j In order to lower the temperature of the molten steel upon arrival, according to the formula, the preset temperature of the steel grade can be the sum of the liquidus temperature of the steel grade and the lowered temperature of the molten steel upon arrival.

[0065] The steel grade preset temperature can be calculated according to the following formula:

[0066] T cy =T c +T j , where T cy Preset temperature for pure iron, T c is the liquidus temperature of pure iron, T j In order to lower the temperature of the molten steel arriving at the station, according to the formula, the preset temperature of pure iron can be the sum of the pure iron liquidus temperature and the lowered temperature of the molten steel arriving at the station.

[0067] In the present application, the preset temperature is selected according to the oxygen content of the molten steel at the station, including:

[0068] Obtain the preset oxygen content of the molten steel arriving at the station;

[0069] Compare the oxygen content of the molten steel arriving at the station with the preset oxygen content of the molten steel arriving at the station, and select the preset temperature.

[0070] Specifically, the preset oxygen content of the molten steel at the arrival station can be set according to actual conditions or experience, for example, set to 100 ppm, and compare the oxygen content of the molten steel at the arrival station with the preset oxygen content of the molten steel at the arrival station. The preset temperature can be selected by comparing the two. Alternatively, a preset value can be set to calculate the ratio of the oxygen content of the molten steel at the arrival station to the preset oxygen content of the molten steel at the arrival station, and the calculated ratio can be compared with the preset value to select the preset temperature.

[0071] In the present application, the step of comparing the oxygen content of the molten steel at the arrival station with the preset oxygen content of the molten steel at the arrival station and selecting the preset temperature includes:

[0072] When the oxygen content of the molten steel arriving at the station is greater than the preset oxygen content of the molten steel arriving at the station, the preset temperature of pure iron is selected as the preset temperature;

[0073] When the oxygen content of the molten steel arriving at the station is less than or equal to the preset oxygen content of the molten steel arriving at the station, the preset temperature of the steel grade is selected as the preset temperature.

[0074] Specifically, when the oxygen content of the molten steel arriving at the station is greater than the preset oxygen content of the molten steel arriving at the station, it can be judged that the molten steel arriving at the station is in an undeoxidized state. Therefore, the pure iron preset temperature is selected as the preset temperature. When the oxygen content of the molten steel arriving at the station is less than or equal to the preset oxygen content of the molten steel arriving at the station, it can be judged that the molten steel arriving at the station is in a deoxidized state. Therefore, the steel grade preset temperature is selected as the preset temperature.

[0075] In the present application, judging whether it is suitable to adopt the RH vacuum treatment production process to perform secondary refining on the molten steel at the station according to the comparison result includes:

[0076] When the comparison result shows that the preset temperature is lower than the temperature of the molten steel at the station, it is suitable to adopt the RH vacuum treatment production process to perform secondary refining on the molten steel at the station;

[0077] When the comparison result shows that the preset temperature is greater than or equal to the temperature of the molten steel at the station, it is not suitable to use the RH vacuum treatment production process to perform secondary refining on the molten steel at the station.

[0078] In the present application, the step of lowering the temperature of the molten steel upon arrival at the station includes:

[0079] Get the preset time;

[0080] Before the RH furnace is evacuated, the temperature of the molten steel at the station is detected to obtain the pre-vacuum temperature;

[0081] The RH furnace starts to evacuate the vacuum chamber. After a preset time, the temperature of the molten steel at the station is detected again to obtain the post-vacuum temperature.

[0082] According to the temperature before vacuum and the temperature after vacuum, the lowered temperature of the molten steel at the arrival station is obtained.

[0083] Specifically, the preset time can be set according to actual conditions or experience, such as 3-5 minutes.

[0084] For example, before the RH furnace is evacuated, the temperature of the molten steel at the station is detected, and the temperature before vacuum is 1600℃. Afterwards, the RH furnace starts to evacuate. After 3-5 minutes, the temperature of the molten steel at the station is detected again, and the temperature after vacuum is 1585℃. The lower temperature of the molten steel at the station can be obtained based on the difference between the two, that is, 1600℃-1585℃=15℃. The lower temperature of the molten steel at the station can be understood as the temperature loss during the evacuation process of the RH furnace.

[0085] The temperature of the molten steel at the station can be detected using a temperature measuring probe.

[0086] In this embodiment, the RH vacuum treatment production process can adopt one of ordinary treatment, degassing treatment and decarburization treatment.

[0087] In summary, according to the oxygen content of the molten steel at the arrival station, the preset temperature is selected, and the preset temperature is compared with the temperature of the molten steel at the arrival station to obtain a comparison result. If the preset temperature is less than the latter, that is, the temperature of the molten steel at the arrival station is still greater than the liquidus temperature of the steel grade or the liquidus temperature of pure iron after the temperature loss during the vacuum pumping process of the RH furnace, the solidification of the molten steel can be effectively avoided. It is suitable to adopt the RH vacuum treatment production process, and subsequent operations such as oxygen blowing and heating can be carried out. If the preset temperature is greater than or equal to the latter, it is not suitable for the RH vacuum treatment production process, and transfer station treatment or return to the furnace treatment is required to avoid the solidification of the molten steel at the arrival station due to the low temperature, causing the molten steel to block the immersion tube and adhere to the ladle.

[0088] Figure 2 A block diagram of a molten steel treatment process identification device in an embodiment of the present application is shown.

[0089] like Figure 2As shown, based on the same inventive concept, the second aspect of the embodiment of the present application further provides a molten steel treatment process identification device 100, comprising:

[0090] An acquisition unit 101 acquires the temperature of the molten steel at the station, the oxygen content of the molten steel at the station, the lowered temperature of the molten steel at the station, the liquidus temperature of the steel grade, and the liquidus temperature of the pure iron. The lowered temperature of the molten steel at the station is the temperature at which the molten steel at the station is lowered when the RH furnace is evacuated;

[0091] Obtaining unit 102, obtaining a preset temperature, wherein the preset temperature is one of a steel grade preset temperature and a pure iron preset temperature, wherein the steel grade preset temperature is obtained according to the steel grade liquidus temperature and the temperature reduction of the molten steel at the station, and the pure iron preset temperature is obtained according to the pure iron liquidus temperature and the temperature reduction of the molten steel at the station;

[0092] A comparison unit 103 selects a preset temperature according to the oxygen content of the molten steel at the station, compares the preset temperature with the temperature of the molten steel at the station, and obtains a comparison result;

[0093] The determination unit 104 determines whether it is suitable to adopt the RH vacuum treatment production process to perform secondary refining on the molten steel arriving at the station according to the comparison result.

[0094] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "one" or "an" preceding a component does not exclude the presence of a plurality of such components. The present invention may be implemented by means of hardware comprising a number of different components and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0095] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. A method for distinguishing molten steel treatment process, characterized in that: include: Obtaining the temperature of the molten steel at the station, the oxygen content of the molten steel at the station, the lowered temperature of the molten steel at the station, the liquidus temperature of the steel grade, and the liquidus temperature of the pure iron, wherein the lowered temperature of the molten steel at the station is the temperature at which the molten steel at the station is lowered when the RH furnace is evacuated; Obtaining a preset temperature, wherein the preset temperature is one of a steel grade preset temperature and a pure iron preset temperature, wherein the steel grade preset temperature is obtained according to the steel grade liquidus temperature and the temperature reduction of the molten steel at the station, wherein the pure iron preset temperature is obtained according to the pure iron liquidus temperature and the temperature reduction of the molten steel at the station, wherein the steel grade preset temperature is obtained according to the steel grade liquidus temperature and the temperature reduction of the molten steel at the station, and wherein the steel grade preset temperature is obtained according to the steel grade liquidus temperature and the temperature reduction of the molten steel at the station, including: calculating the steel grade preset temperature according to the following formula: T gy =T g +T j , where T gy Preset temperature for steel grade, T g is the liquidus temperature of the steel grade, T j To reduce the temperature of the molten steel at the station, the pure iron preset temperature is obtained according to the pure iron liquidus temperature and the temperature reduction of the molten steel at the station, including: calculating the pure iron preset temperature according to the following formula: T cy =T c +T j , where T cy Preset temperature for pure iron, T c is the liquidus temperature of pure iron, T j To lower the temperature of molten steel arriving at the station; According to the oxygen content of the molten steel at the station, a preset temperature is selected, and the preset temperature and the temperature of the molten steel at the station are compared to obtain a comparison result. The selecting of the preset temperature according to the oxygen content of the molten steel at the station includes: obtaining the preset oxygen content of the molten steel at the station, comparing the oxygen content of the molten steel at the station with the preset oxygen content of the molten steel at the station, and selecting the preset temperature. The comparing of the oxygen content of the molten steel at the station with the preset oxygen content of the molten steel at the station and selecting the preset temperature includes: when the oxygen content of the molten steel at the station is greater than the preset oxygen content of the molten steel at the station, the preset temperature of pure iron is selected as the preset temperature, and when the oxygen content of the molten steel at the station is less than or equal to the preset oxygen content of the molten steel at the station, the preset temperature of the steel grade is selected as the preset temperature; According to the comparison result, determine whether it is suitable to adopt the RH vacuum treatment production process for secondary refining of the molten steel at the station. According to the comparison result, determine whether it is suitable to adopt the RH vacuum treatment production process for secondary refining of the molten steel at the station, including: when the comparison result is that the preset temperature is less than the temperature of the molten steel at the station, it is suitable to adopt the RH vacuum treatment production process for secondary refining of the molten steel at the station; when the comparison result is that the preset temperature is greater than or equal to the temperature of the molten steel at the station, it is not suitable to adopt the RH vacuum treatment production process for secondary refining of the molten steel at the station.

2. The method according to claim 1, characterized in that The step of obtaining the temperature and oxygen content of the molten steel at the station includes: Use temperature probe to detect the molten steel at the station and get the temperature of the molten steel at the station; The oxygen content of the molten steel at the station is obtained by using an oxygen probe to detect the molten steel at the station.

3. The method according to claim 1, characterized in that include: Get the preset time; Before the RH furnace is evacuated, the temperature of the molten steel at the station is detected to obtain the pre-vacuum temperature; The RH furnace starts to evacuate the vacuum chamber. After a preset time, the temperature of the molten steel at the station is detected again to obtain the post-vacuum temperature. According to the temperature before vacuum and the temperature after vacuum, the lowered temperature of the molten steel at the arrival station is obtained.

4. The method according to claim 1, characterized in that: Get the liquidus temperature of steel grades and pure iron, including: According to the liquidus calculation formula, the liquidus temperature of the steel grade and the liquidus temperature of pure iron are calculated.

5. The device for distinguishing the molten steel treatment process is characterized in that: The device is used to implement the method according to claim 1, and the device comprises: An acquisition unit is used to acquire the temperature of the molten steel at the station, the oxygen content of the molten steel at the station, the lowered temperature of the molten steel at the station, the liquidus temperature of the steel grade, and the liquidus temperature of the pure iron. The lowered temperature of the molten steel at the station is the temperature at which the molten steel at the station is lowered when the RH furnace is vacuumed; Obtaining a unit, obtaining a preset temperature, wherein the preset temperature is one of a steel grade preset temperature and a pure iron preset temperature, wherein the steel grade preset temperature is obtained according to the steel grade liquidus temperature and the temperature reduction of the molten steel at the station, and the pure iron preset temperature is obtained according to the pure iron liquidus temperature and the temperature reduction of the molten steel at the station; A comparison unit selects a preset temperature according to the oxygen content of the molten steel at the station, compares the preset temperature with the temperature of the molten steel at the station, and obtains a comparison result; The judging unit judges whether it is suitable to adopt the RH vacuum treatment production process to carry out secondary refining of the molten steel at the station according to the comparison result.

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