CN114460124A - Method for judging influence of rare earth content in casting molten steel on melting temperature of crystallizer casting powder - Google Patents
Method for judging influence of rare earth content in casting molten steel on melting temperature of crystallizer casting powder Download PDFInfo
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- CN114460124A CN114460124A CN202210080712.3A CN202210080712A CN114460124A CN 114460124 A CN114460124 A CN 114460124A CN 202210080712 A CN202210080712 A CN 202210080712A CN 114460124 A CN114460124 A CN 114460124A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 94
- 239000010959 steel Substances 0.000 title claims abstract description 94
- 238000005266 casting Methods 0.000 title claims abstract description 89
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 80
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 77
- 238000002844 melting Methods 0.000 title claims abstract description 72
- 230000008018 melting Effects 0.000 title claims abstract description 72
- 239000000843 powder Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002893 slag Substances 0.000 claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 230000000704 physical effect Effects 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- 239000002436 steel type Substances 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 3
- 230000004907 flux Effects 0.000 description 15
- 238000005259 measurement Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- -1 H08 rare earth Chemical class 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/02—Investigating or analyzing materials by the use of thermal means by investigating changes of state or changes of phase; by investigating sintering
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a method for judging the influence of the rare earth content in casting molten steel on the melting temperature of crystallizer casting powder, belonging to the technical field of continuous casting powder. The method provided by the invention comprises the steps of respectively taking slag samples of the casting powder on the molten steel surface in the crystallizer in the casting process of rare earth steel and non-rare earth steel for the same steel grade and the same crystallizer casting powder in the casting process of rare earth steel, detecting the melting temperature by using a high-temperature physical property tester, comparing the detection results, and judging the influence of the casting process of the rare earth steel on the melting temperature of the crystallizer casting powder. The method provided by the invention has a great guiding effect on the continuous casting production of the rare earth steel.
Description
Technical Field
The invention belongs to the technical field of continuous casting covering slag, and particularly relates to a method for judging the influence of the content of rare earth in casting molten steel on the melting temperature of crystallizer covering slag.
Background
In the continuous casting production process, the physical and chemical properties of the crystallizer covering slag directly influence the stable continuous casting production and the quality and the yield of casting blanks, and the covering slag added into the crystallizer can fully exert five metallurgical functions only by having proper physical and chemical properties: covering and heat preservation, secondary oxidation prevention, impurity absorption, lubrication between the crystallizer and the casting blank and heat transfer between the crystallizer and the casting blank improvement. Good performance of these functions is achieved by virtue of good physical and chemical properties of the molten mold flux.
The melting temperature is the most important physical and chemical property of the continuous casting crystallizer covering slag, is closely related to the liquid slag heat transfer above the meniscus of the crystallizer, the thickness of a molten slag layer and the slag consumption, and has important influence on the heat insulation and heat preservation performance and the lubricating performance of the crystallizer covering slag. In the casting process of the rare earth steel, because the rare earth molten steel has extremely strong reducibility, a more violent slag-metal interface reaction exists in a crystallizer during casting, and rare earth inclusions floating to the slag-metal interface have strong agglomeration tendency, so that the melting temperature of the casting powder is easily changed, the service performance of the casting powder is influenced, and the stability and the smoothness of a continuous casting process and the quality of a casting blank are seriously influenced.
In the casting process of the rare earth steel with different contents, the influence of the casting of the rare earth steel with different contents on the melting temperature of the crystallizer casting powder can be accurately judged, the service performance of the casting powder in the casting process can be judged, an important guiding function is provided for the continuous casting of the rare earth steel, the method has important significance for the stability and the smoothness of the continuous casting process of the rare earth steel and the quality of casting blanks, and is an important measure for ensuring the continuous casting castability of the rare earth steel, improving the quality of the casting blanks and reducing the production cost.
However, at present, the influence of rare earth oxides on the physical and chemical properties of the mold powder is mainly studied in a laboratory in the prior art, and even if the rare earth steel also refers to the addition amount of rare earth, the influence of the content of rare earth in the casting molten steel on the melting temperature of the mold powder of the crystallizer is unknown.
Disclosure of Invention
In order to solve the problem that casting of rare earth steel with different contents affects the melting temperature of the casting powder, the invention provides a method for judging the influence of the content of rare earth in casting molten steel on the melting temperature of the crystallizer casting powder, which comprises the following steps:
1) taking a slag sample of the covering slag on the liquid level of the steel in the crystallizer in the casting process of the rare earth steel; taking a casting powder slag sample on the liquid level of the molten steel in the crystallizer during the casting process of the same steel type and the same crystallizer casting powder non-rare earth steel, grinding the two taken casting powder slag samples to ensure that the granularity reaches 200 meshes, manufacturing a melting temperature detection standard sample, and detecting by using a high-temperature physical property tester;
2) and comparing and analyzing the melting temperature detection results of the two slag samples corresponding to the rare earth steel and the non-rare earth steel, and judging the influence of the rare earth content in the casting molten steel on the melting temperature of the crystallizer casting powder.
In the above method, the melting temperature includes a softening temperature, a hemispherical point temperature and a flowing temperature, wherein the softening temperature refers to a temperature at which the melting temperature detection standard sample becomes 90% of the original height with the increase of temperature in the detection process, the hemispherical point temperature refers to a temperature at which the melting temperature detection standard sample becomes 50% of the original height with the increase of temperature in the detection process, and the flowing temperature refers to a temperature at which the melting temperature detection standard sample becomes 20% of the original height with the increase of temperature in the detection process.
The method provided by the invention can be used for deeply and comprehensively analyzing the influence on the melting temperature of the casting powder in the casting process of the rare earth molten steel with different contents on the basis of determining the actual rare earth content in the casting molten steel, thereby analyzing the influence on the service performance of the casting powder. The results of the examples show that the method provided by the invention is very reliable when being used for judging the influence of different rare earth contents in the casting molten steel on the melting temperature of the crystallizer casting powder, and has an important guiding effect on the continuous casting production of the rare earth steel.
Detailed Description
In the continuous casting production process of rare earth steel, the crystallizer covering slag is an indispensable auxiliary material, and because the rare earth molten steel has strong reducibility, a more violent slag-metal interface reaction exists in the crystallizer during casting, and rare earth inclusions floating to the slag-metal interface have strong coalescence tendency, so that the melting temperature of the covering slag is easily changed, five major functions of the covering slag can not be normally exerted, and the stability and the smoothness of a continuous casting process and the quality of a casting blank are seriously influenced. Therefore, the invention provides a method for judging the influence of casting of rare earth steel with different contents on the melting temperature of the casting powder, which can deeply and comprehensively analyze the influence of the casting of the rare earth steel with different contents on the melting temperature of the casting powder in the casting process on the basis of determining the actual rare earth content in the casting molten steel, thereby analyzing the influence on the service performance of the casting powder and having great guiding effect on the continuous casting production of the rare earth steel.
The method for judging the influence of the rare earth content in the casting molten steel on the melting temperature of the crystallizer casting powder provided by the invention comprises the following steps of:
1) taking a slag sample of the covering slag on the liquid level of the steel in the crystallizer in the casting process of the rare earth steel; taking a casting powder slag sample on the liquid level of the molten steel in the crystallizer during the casting process of the same steel type and the same crystallizer casting powder non-rare earth steel, grinding the two taken casting powder slag samples to ensure that the granularity reaches 200 meshes, manufacturing a melting temperature detection standard sample, and detecting by using a high-temperature physical property tester;
2) and comparing and analyzing the melting temperature detection results of the two slag samples corresponding to the rare earth steel and the non-rare earth steel, and judging the influence of the rare earth content in the casting molten steel on the melting temperature of the crystallizer casting powder.
In one embodiment, the melting temperature includes a softening temperature, which is the temperature at which the melting temperature detection standard becomes 90% of its original height as the temperature increases during the test, a half-ball temperature, which is the temperature at which the melting temperature detection standard becomes 50% of its original height as the temperature increases during the test, and a flow temperature, which is the temperature at which the melting temperature detection standard becomes 20% of its original height as the temperature increases during the test.
The present invention will be described in detail below with reference to specific examples.
Example 1
In this example, production of H08 rare earth steel is taken as an example, rare earth content in casting molten steel is 3.4ppm, a mold flux slag sample on a molten steel surface in a crystallizer in casting rare earth steel is taken, the same mold flux is taken, a mold flux slag sample on a molten steel surface in a crystallizer in casting H08 steel non-rare earth steel is taken, two kinds of the taken slag samples are ground to have a particle size of 200 mesh, a melting temperature detection standard sample (for example, a melting temperature detection standard sample with a particle size of Φ 3mm × 3 mm) is prepared, and melting temperature detection is performed by using a high temperature physical property tester (GX-III type high temperature physical property tester). Since the mold flux for continuous casting is a mixture made of various minerals, the melting temperature thereof is not a fixed value but a melting range, the melting temperature of the mold flux in the present invention is designed to include a softening temperature at which a melting temperature detection standard becomes 90% of the original height as the temperature rises during the course of measurement, a hemispherical point temperature at which a melting temperature detection standard becomes 50% of the original height as the temperature rises during the course of measurement, and a flowing temperature at which a melting temperature detection standard becomes 20% of the original height as the temperature rises during the course of measurement. The results of the measurements are shown in Table 1 below.
Table 1: detection result of melting temperature of covering slag in casting of H08 rare earth steel and H08 non-rare earth steel
As can be seen from Table 1, when the rare earth content in H08 steel is 3.4ppm, the difference between the melting temperatures of the slag of mold flux in casting rare earth steel and non-rare earth steel is small, indicating that the melting temperature of mold flux in casting H08 rare earth steel has little influence.
Example 2
In this example, the production of Q345NQR rare earth steel is taken as an example, the rare earth content of the cast molten steel is 13ppm, a mold flux slag sample on the surface of molten steel in a crystallizer in the casting of Q345NQR rare earth steel is taken, the same mold flux is applied, a mold flux slag sample on the surface of molten steel in a crystallizer in the casting of Q345NQR steel non-rare earth steel is taken, the two taken slag samples are ground to make the particle size 200 mesh, a melting temperature detection standard sample (for example, a Φ 3mm × 3mm melting temperature detection standard) is prepared, and the melting temperature is detected by a high-temperature physical property tester (GX-III high-temperature physical property tester). The detected melting temperature includes a softening temperature, a hemispherical point temperature and a flowing temperature, wherein the softening temperature refers to a temperature at which the melting temperature detection standard becomes 90% of the original height along with the increase of the temperature in the detection process, the hemispherical point temperature refers to a temperature at which the melting temperature detection standard becomes 50% of the original height along with the increase of the temperature in the detection process, and the flowing temperature refers to a temperature at which the melting temperature detection standard becomes 20% of the original height along with the increase of the temperature in the detection process. The results of the measurements are shown in Table 2 below.
Table 2: detection result of melting temperature of covering slag in casting of Q345NQR rare earth steel and Q345NQR non-rare earth steel
As can be seen from Table 2, when the rare earth content in the Q345NQR steel is 13ppm, the difference between the melting temperatures of the slag of the mold flux in the casting of the rare earth steel and the non-rare earth steel is small, which indicates that the melting temperature of the mold flux in the casting of the Q345NQR rare earth steel is not greatly influenced.
Example 3
In this example, a572Gr65 rare earth steel was produced, the rare earth content of the cast molten steel was 53ppm, a covering slag sample on the molten steel surface in the crystallizer in the casting of a572Gr65 rare earth steel was taken, the same covering slag was used, a covering slag sample on the molten steel surface in the crystallizer in the casting of a572Gr65 steel non-rare earth steel was taken, the two slag samples were ground to have a particle size of 200 mesh, a melting temperature detection standard sample (for example, a Φ 3mm × 3mm melting temperature detection standard sample) was prepared, and melting temperature detection was performed using a high temperature property tester (GX-III type high temperature property tester). The detected melting temperature includes a softening temperature, a hemispherical point temperature and a flowing temperature, wherein the softening temperature refers to a temperature at which the melting temperature detection standard becomes 90% of the original height along with the increase of the temperature in the detection process, the hemispherical point temperature refers to a temperature at which the melting temperature detection standard becomes 50% of the original height along with the increase of the temperature in the detection process, and the flowing temperature refers to a temperature at which the melting temperature detection standard becomes 20% of the original height along with the increase of the temperature in the detection process. The results of the measurements are shown in Table 3 below.
Table 3: detection results of molten slag melting temperature of covering slag in casting of A572Gr65 rare earth steel and A572Gr65 non-rare earth steel
As can be seen from Table 3, when the rare earth content in the A572Gr65 steel is 53ppm, the difference between the melting temperatures of the mold flux slag in the casting of the rare earth steel and the non-rare earth steel is large, which indicates that the casting of the A572Gr65 rare earth steel has a large influence on the melting temperature of the mold flux.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A method for judging the influence of the content of rare earth in casting molten steel on the melting temperature of crystallizer casting powder comprises the following steps:
1) taking a slag sample of the covering slag on the liquid level of the steel in the crystallizer in the casting process of the rare earth steel; taking a casting powder slag sample on the liquid level of the molten steel in the crystallizer during the casting process of the same steel type and the same crystallizer casting powder non-rare earth steel, grinding the two taken casting powder slag samples to ensure that the granularity reaches 200 meshes, manufacturing a melting temperature detection standard sample, and detecting by using a high-temperature physical property tester;
2) and comparing and analyzing the melting temperature detection results of the two slag samples corresponding to the rare earth steel and the non-rare earth steel, and judging the influence of the rare earth content in the casting molten steel on the melting temperature of the crystallizer casting powder.
2. The method of claim 1, wherein the melting temperature comprises a softening temperature, a hemispherical point temperature, and a flow temperature, wherein the softening temperature is the temperature at which the melting temperature detects 90% of the original height of the standard as the temperature increases during the testing process, the hemispherical point temperature is the temperature at which the melting temperature detects 50% of the original height of the standard as the temperature increases during the testing process, and the flow temperature is the temperature at which the melting temperature detects 20% of the original height of the standard as the temperature increases during the testing process.
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Cited By (1)
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| CN114965934A (en) * | 2022-05-13 | 2022-08-30 | 包头钢铁（集团）有限责任公司 | Method for judging influence of rare earth content in casting molten steel on viscosity of crystallizer casting powder |
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