CN115219521A - Method and equipment for detecting quality of blank shell in crystallizer - Google Patents

Method and equipment for detecting quality of blank shell in crystallizer Download PDF

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Publication number
CN115219521A
CN115219521A CN202210703190.8A CN202210703190A CN115219521A CN 115219521 A CN115219521 A CN 115219521A CN 202210703190 A CN202210703190 A CN 202210703190A CN 115219521 A CN115219521 A CN 115219521A
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sulfur
crystallizer
aluminum
continuous casting
blocks
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陈斌
高攀
朱克然
朱国森
黄福祥
刘风刚
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Qian'an Iron And Steel Co Of Shougang Corp
Shougang Group Co Ltd
Beijing Shougang Co Ltd
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Qian'an Iron And Steel Co Of Shougang Corp
Shougang Group Co Ltd
Beijing Shougang Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/954—Inspecting the inner surface of hollow bodies, e.g. bores
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
    • G01N1/44—Sample treatment involving radiation, e.g. heat
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques

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Abstract

The invention discloses a method and a device for detecting the quality of a blank shell in a crystallizer, belonging to the technical field of steel making, wherein the method comprises the following steps: melting sulfur powder, and solidifying to prepare sulfur blocks; filling the sulfur blocks into an aluminum tank; adding the aluminum tank filled with the sulfur blocks into a crystallizer of a continuous casting machine, and controlling the time consumed for adding the sulfur blocks into the aluminum tank to be 1-2s; sampling a continuous casting billet produced by a continuous casting machine, and carrying out a sulfur print test on a slab sample to obtain the thickness change of a billet shell in the crystallizer and/or the solidification coefficient in the crystallizer. The method improves the accuracy of detecting the quality of the shell in the crystallizer.

Description

Method and equipment for detecting quality of blank shell in crystallizer
Technical Field
The invention relates to the technical field of steel making, in particular to a method and equipment for detecting the quality of a blank shell in a crystallizer.
Background
At present, a slab caster is the most common steel casting method because of its characteristics of rapidity, high efficiency and the like. However, in the continuous casting process, due to the characteristics of solidification shrinkage and the like of molten steel, the molten steel is solidified in a crystallizer to have the characteristics of unevenness and the like, the surface quality defect of a plate blank can be caused slightly, and serious accidents such as steel leakage and the like can be caused seriously. In particular, in recent years, in order to solve quality problems such as transverse crack of slab corners, continuous casting workers have developed techniques such as a chamfered crystallizer, and the chamfered crystallizer has more complicated heat transfer compared with a conventional right-angle crystallizer, so that the rule of the molten steel in the crystallizer in the solidification process is more difficult to grasp, and a breakout accident is easily caused when the casting speed is increased.
At present, a numerical simulation method is adopted to estimate the thickness of a billet shell in a crystallizer and the cooling uniformity, but because a plurality of field parameters such as the thickness of a covering slag film, the thickness of an air gap and the like are lacked, the calculation is difficult to be accurate, the precision of an actual result is low, and the actual result is difficult to be matched with the actual situation on the field.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for detecting the quality of a shell blank in a crystallizer, and solves the technical problem that the detection result of the prior art for the quality of the shell blank in the crystallizer is inaccurate.
In a first aspect, an embodiment of the present invention provides a method for detecting quality of a shell in a crystallizer, including: melting sulfur powder, and solidifying to prepare sulfur blocks; filling the sulfur blocks into an aluminum can; adding the aluminum tank filled with the sulfur block into a crystallizer of a continuous casting machine, and controlling the time consumed for adding the sulfur block into the aluminum tank to be 1-2s; and sampling the continuous casting billet produced by the continuous casting machine, and performing a sulfur print test on the taken slab sample to obtain the thickness change of the slab shell in the crystallizer and/or the solidification coefficient in the crystallizer.
Optionally, melting and solidifying the sulfur powder to prepare a sulfur block, including:
heating and melting the sulfur powder to obtain liquid sulfur;
and controlling the cooling speed of 0.8-1.8 ℃/min to cool and solidify the liquid sulfur to obtain the sulfur block.
Optionally, charging the sulphur block into an aluminium can, comprising: cutting the solidified sulfur blocks into 200-300g sulfur small blocks, and filling into the aluminum can.
Optionally, the heating melts the sulfur powder to obtain liquid sulfur, including: controlling the heating speed of 8-20 ℃/min to heat the sulfur powder; and preserving heat for a preset time after heating for 6-15min to obtain the liquid sulfur.
Optionally, during the processes of heating, melting, cooling and solidifying the sulfur powder, continuously introducing a protective atmosphere into the chamber for heating and melting the sulfur powder, so as to control the oxygen partial pressure in the atmosphere in the chamber to be below 0.1%.
Optionally, the aluminum can is a cylinder, wherein the diameter is 40-80 mm, and the height is 80-120 mm.
Optionally, the total weight of the sulfur added into the aluminum tank is determined according to the product of the area of the crystallizer and a conversion constant, and the conversion constant takes a value in the range of 3-5.
Optionally, when the aluminum pot containing the sulfur blocks is added into a crystallizer of a continuous casting machine, the aluminum pot is added into the crystallizer at the following positions: the width of the crystallizer is 1/8, the thickness of the crystallizer is 1/2, and the depth of the crystallizer is positioned in an impact area of a water gap.
Optionally, the sampling a continuous casting slab produced by the continuous casting machine, and performing a sulfur print test on the slab sample to obtain a slab shell thickness change in the crystallizer and/or a solidification coefficient in the crystallizer include:
after the slab casting of the continuous casting machine is finished, taking the concave liquid level of the aluminum tank when the aluminum tank is added into the crystallizer as the initial sampling position, taking 50-150 mm as the sampling interval, sampling the continuous casting slab, and obtaining M slab samples with sulfur marks, wherein M is an integer larger than 1;
respectively carrying out sulfur print tests on the M plate blank samples to obtain corresponding M sulfur print photos;
and determining the blank shell thickness change in the crystallizer and/or the solidification coefficient in the crystallizer based on the sulfur print distribution state shown in the M sulfur print photos.
In a second aspect, an embodiment of the present invention provides an apparatus for detecting quality of a shell in a crystallizer, including:
the sulfur processing device is used for melting and solidifying the sulfur powder to prepare a sulfur block; the canning device is used for filling the sulfur blocks into an aluminum can; the adding device is used for adding the aluminum tank filled with the sulfur blocks into a crystallizer of a continuous casting machine and controlling the time consumed for adding the sulfur blocks into the aluminum tank to be 1-2s; and the detection device is used for sampling the continuous casting billet produced by the continuous casting machine and performing a sulfur print test on the taken slab sample so as to obtain the thickness change of the slab shell in the crystallizer and/or the solidification coefficient in the crystallizer.
One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:
melting sulfur powder, solidifying into sulfur blocks, and filling into an aluminum tank; adding the aluminum tank filled with the sulfur blocks into a crystallizer of a continuous casting machine, and controlling the time consumed for adding the sulfur blocks into the aluminum tank to be 1-2s; the continuous casting billet produced by the continuous casting machine is sampled, and a sulfur print test is carried out on the slab sample to obtain the thickness change of the billet shell in the crystallizer and/or the solidification coefficient in the crystallizer.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a method for detecting the quality of a blank shell in a crystallizer in an embodiment of the invention;
FIG. 2 is a schematic composition diagram of a device for detecting the quality of a shell in a crystallizer in an embodiment of the invention.
Detailed Description
The embodiment of the invention provides a method and a device for detecting the quality of a shell blank in a crystallizer, and solves the technical problem that the detection result of the prior art for the quality of the shell blank in the crystallizer is inaccurate.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Referring to fig. 1, an embodiment of the present invention provides a method for detecting quality of a shell in a crystallizer, including the following steps:
s101, melting the sulfur powder and then solidifying to prepare the sulfur block.
Specifically, the S content in the used sulfur powder is more than or equal to 99%, the problem that the purity of the sulfur powder is not enough to influence the test accuracy is avoided, and a good test effect is ensured.
In some embodiments, S101 specifically includes the following steps:
s1011: and melting the sulfur powder to obtain liquid sulfur.
Heating and melting the sulfur powder until the sulfur powder is melted into liquid sulfur. Specifically, in order to ensure that the sulfur powder is fully melted, the sulfur powder is efficiently added into a crystallizer, the sulfur powder is heated at a heating speed of 8-20 ℃/min, and after the sulfur powder is heated for 6-15min, the temperature is kept for a preset time to obtain liquid sulfur. For example, the preset time period for heat preservation is 120min.
S1012, cooling and solidifying the liquid sulfur at a cooling speed of 0.8-1.8 ℃/min to obtain a sulfur block.
Further, in order to reduce the gasification of the sulfur powder in the processes of heating, melting, cooling and solidifying so as to improve the utilization rate of the sulfur powder, in the process of heating, melting, cooling and solidifying the sulfur powder (i.e. in the process of executing the steps S101 to S1012), continuously introducing a protective atmosphere into the chamber for melting and solidifying the sulfur powder so as to control the oxygen partial pressure in the atmosphere in the chamber to be below 0.1%. The protective atmosphere may be an inert gas such as argon.
S102, filling the sulfur blocks into an aluminum can.
In S102, the cooled and solidified sulfur blocks can be directly filled into an aluminum can; or the sulfur blocks obtained by cooling and solidification can be blocked and then put into an aluminum tank, and the sulfur can be quickly melted after being put into the crystallizer by blocking and then putting into the aluminum tank. Specifically, the solidified sulfur block may be cut into small sulfur blocks of 200 to 300g and then charged into an aluminum can.
The aluminum can is cylindrical, wherein the diameter is 40-80 mm, and the height is 80-120 mm. The reason for selecting the aluminum pot as the container is that the melting point of aluminum is low, the melting is fast, and aluminum is an alloy element existing in molten steel, so that the quality of continuous casting billets cannot be influenced. The size of the aluminum tank is more suitable within the numerical range, if the aluminum tank is too small, the aluminum tank is influenced by the buoyancy, and the adding difficulty is too large; if the aluminum can is too large, it cannot be added to the crystallizer.
S103, adding the aluminum tank filled with the sulfur blocks into a crystallizer of a continuous casting machine, and controlling the time consumed for adding the aluminum tank into the crystallizer to be 1-2S.
For each heat, an aluminum tank filled with sulfur blocks needs to be added into a crystallizer of the continuous casting machine again, so that the thickness change of a blank shell in the crystallizer and the cooling uniformity are detected for each heat respectively.
It should be noted that, in order to ensure the reliability of the test result, the position of adding the aluminum pot containing the sulfur blocks to the crystallizer needs to be fixed for all furnaces.
Preferably, the aluminum pot filled with the sulfur blocks is added into the crystallizer at the following positions: is positioned at 1/8 of the width and 1/2 of the thickness of the crystallizer, and the depth is positioned in the impact area of the water gap. This fixed position also ensures that the sulphur powder melts quickly after entering the crystalliser.
In the specific implementation process, the total weight of the sulfur added into the aluminum tank in the crystallizer is determined according to the product of the area of the crystallizer and a conversion constant, and the conversion constant takes a numerical value within the range of 3-5. The total weight of the sulfur mainly takes the field test result into consideration, and if too little sulfur is added, the developing effect is poor; if too much sulphur is added, the risk of bleed-out is caused.
S104, sampling the continuous casting billet produced by the continuous casting machine, and performing a sulfur print test on the taken slab sample to obtain the thickness change of the slab shell in the crystallizer and/or the solidification coefficient in the crystallizer.
Specifically, in the slab casting process aiming at the current heat, an aluminum tank filled with sulfur blocks is added into a crystallizer of a continuous casting machine; and sampling the continuous casting slab, namely taking the concave liquid surface of the aluminum tank filled with the sulfur blocks when the aluminum tank is added into the crystallizer as the initial sampling position after the slab casting of the continuous casting machine for the current furnace is finished, and sampling the continuous casting slab at the sampling interval of 50-150 mm to obtain M slab samples with sulfur marks.
In terms of the number of slab samples to be taken, in order to ensure accuracy, all slab segments with sulfur components on the continuous casting slab can be sampled, or a specific number of slab samples can be taken.
And (3) carrying out a sulfur print test on the taken slab sample to obtain the thickness change of the slab shell in the crystallizer and/or the solidification coefficient in the crystallizer: respectively carrying out sulfur print tests on the M plate blank samples to obtain corresponding M sulfur print photos; and determining the solidification coefficient and blank shell thickness change in the crystallizer based on the sulfur print distribution states presented in the M sulfur print photos.
In the process of the sulfur seal test, sulfuric acid on photographic paper reacts with sulfide on a plate blank sample to generate hydrogen sulfide gas; the hydrogen sulfide gas reacts with silver bromide on the printing paper to generate silver sulfide which is deposited on the corresponding position of the printing paper to form black or dark brown spots, thereby forming a sulfur print photo. Specifically, the slab sample can be subjected to a sulfur print test by using the standard GB/T4236-2016 of Steel sulfur print test method to obtain M sulfur print photos, which are not described in detail herein.
Specifically, after being added into the crystallizer, the sulfur can be uniformly distributed in liquid-phase molten steel but cannot enter a solidified blank shell; therefore, the thickness of the blank shell on each sulfur print photo can be detected through image detection technology or manual observation and measurement; and obtaining the thickness change of the blank shell in the crystallizer according to the thickness of the blank shell on the M sulphur print photos.
Specifically, the sulfur seal distribution states presented in the M sulfur seal photos are detected, and the solidification coefficient representing the change of the solidification speed of the molten steel in the crystallizer is calculated according to the sulfur seal distribution states on the M sulfur seal photos:
in the process of solidifying the molten steel in the crystallizer, the rule of the change of the solidification speed is in direct proportion to the square root of the thickness difference S (mm) of the blank shells of the two adjacent slab samples and the solidification duration T (min) of the two adjacent slab samples, namely:
Figure BDA0003704409110000061
the proportionality constant K is the solidification coefficient, which reflects the speed of solidification, so that the solidification coefficient K varies with the molten steel properties and the process conditions in a large range. It can be seen from the above formula that the solidification coefficient can be obtained according to the shell thickness and the solidification duration on two adjacent sulfur print photos. Specifically, the solidification duration is the sampling time interval of two adjacent slab samples. The solidification coefficient and the characteristic of the uniformity of the molten steel cooled in the crystallizer are shown, if a plurality of solidification coefficients obtained by each sulfur print photo can obtain the uniformity of the molten steel cooled in the crystallizer, the smaller the fluctuation among the solidification coefficients is, the better the cooling uniformity is, otherwise, the uniformity is worse.
The quality detection of the blank shell in the crystallizer provided by the embodiment of the invention can be exemplarily described on the premise of smelting by adopting a 300-ton top-bottom combined blown converter and an RH refining furnace:
the first embodiment is as follows:
step 1: selecting sulfur powder with the S content of 99.5%, heating the sulfur powder at the heating rate of 8 ℃/min for 15min, then preserving heat for 120min, and cooling to room temperature at the cooling rate of 0.8 ℃/min to obtain sulfur blocks. Introducing argon as protective atmosphere in the processes of heating, melting, cooling and solidifying the sulfur so as to control O in the cavity 2 The partial pressure of (A) is 0.1% or less.
Step 2: cutting the sulfur blocks into small blocks of 200g, then filling the small blocks into an aluminum tank, and adding the aluminum tank filled with the small blocks of sulfur into a crystallizer for each heat, wherein the adding time is 1s; the aluminum can is a cylinder with the diameter of 40mm and the height of 100mm. The positions of addition to the crystallizer are: the width of the crystallizer is 1/8, the thickness of the crystallizer is 1/2, and the insertion depth is in the middle of the impact area of the water gap. Total weight of sulfur (kg) =3 × area of crystallizer (m) charged into crystallizer 2 )。
And step 3: after the slab casting of the current heat is finished, taking the concave liquid surface of an aluminum tank filled with small sulfur when the aluminum tank is added into the crystallizer as the position of 0m of sampling, cutting and sampling once every 50mm, obtaining a plurality of sulfur print photos by adopting a sulfur print test method, and detecting the plurality of sulfur print photos to obtain the thickness change and the solidification coefficient of the slab shell in the crystallizer.
Example two
Step 1: selecting sulfur powder with the S content of 99.7 percent, heating the sulfur powder at the temperature rise speed of 15 ℃/min, and controlling the heating time to be within9min, then preserving the heat for 120min, and cooling to room temperature according to the cooling speed of 1.3 ℃/min to obtain the sulfur block. Introducing argon in the heating melting and cooling solidification process of the sulfur to control O 2 The partial pressure of (2) is 0.1% or less.
Step 2: cutting the sulfur blocks into 250g small blocks, then filling the small blocks into an aluminum tank, and adding the aluminum tank filled with the small blocks of sulfur into a crystallizer for each heat, wherein the adding time is 1.5s; the aluminum can is a cylinder with the diameter of 60mm and the height of 100mm. The positions of addition to the crystallizer are: the width of the crystallizer is 1/8, the thickness of the crystallizer is 1/2, and the insertion depth is in the middle of the impact area of the water gap. Total weight of sulfur (kg) =4 × area of crystallizer (m) charged into crystallizer 2 )。
And 3, step 3: after the slab casting of the current heat is finished, taking the concave liquid surface of an aluminum tank filled with small sulfur when the aluminum tank is added into the crystallizer as the position of 0m of sampling, cutting and sampling once every 100mm, obtaining a plurality of sulfur print photos by adopting a sulfur print test method, and detecting the plurality of sulfur print photos to obtain the thickness change and the solidification coefficient of the slab shell in the crystallizer.
EXAMPLE III
Step 1: selecting sulfur powder with the S content of 99.8%, heating the sulfur powder at the heating rate of 20 ℃/min for 6min, then preserving heat for 120min, and cooling to room temperature at the cooling rate of 1.8 ℃/min to obtain sulfur blocks. Argon is introduced during the melting and cooling process of the sulfur so as to control the partial pressure of O2 to be below 0.1 percent.
And 2, step: cutting the sulfur blocks into small blocks of 300g, then filling the small blocks into an aluminum tank, and adding the aluminum tank filled with the small blocks of sulfur into a crystallizer for each heat, wherein the adding time is 1s; the aluminum can is a cylinder with the diameter of 80mm and the height of 120mm. The positions of addition to the crystallizer are: the width of the crystallizer is 1/8, the thickness of the crystallizer is 1/2, and the insertion depth is in the middle of the impact area of the water gap. Total weight (kg) of sulfur powder charged into the crystallizer (= 5 × area of crystallizer (m) 2 )。
And step 3: after the slab casting of the current heat is finished, taking the concave liquid surface of an aluminum tank filled with small sulfur when the aluminum tank is added into the crystallizer as the position of 0m of sampling, cutting and sampling once every 150mm, obtaining a plurality of sulfur print photos by adopting a sulfur print test method, and detecting the plurality of sulfur print photos to obtain the thickness change and the solidification coefficient of the slab shell in the crystallizer.
Through the three specific embodiments, the thickness change and the solidification coefficient of the blank shell in the crystallizer can be accurately detected.
Based on the same inventive concept, the embodiment of the present invention provides a quality detection apparatus for a blank shell in a crystallizer, which is shown in fig. 2 and includes the following devices:
a sulfur processing device 201 for melting and solidifying sulfur powder to prepare a sulfur block;
a canning device 202 for filling the sulfur blocks into aluminum cans;
the adding device 203 is used for adding the aluminum tank filled with the sulfur blocks into a crystallizer of a continuous casting machine and controlling the time consumed for adding the sulfur blocks into the aluminum tank to be 1-2s;
and the detection device 204 is used for sampling the continuous casting billet produced by the continuous casting machine and performing a sulfur print test on the taken slab sample to obtain the thickness change of the slab shell in the crystallizer and/or the solidification coefficient in the crystallizer.
The crystallizer inner shell quality detection apparatus provided in this embodiment is used to implement the crystallizer inner shell quality detection method, and therefore, for further implementation details, reference may be made to the crystallizer inner shell quality detection method embodiment described above, and for brevity of the description, no further description is given here.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A method for detecting the quality of a blank shell in a crystallizer is characterized by comprising the following steps:
melting sulfur powder, and solidifying to prepare sulfur blocks;
filling the sulfur blocks into an aluminum can;
adding the aluminum tank filled with the sulfur blocks into a crystallizer of a continuous casting machine, and controlling the time consumed for adding the sulfur blocks into the aluminum tank to be 1-2s;
and sampling the continuous casting billet produced by the continuous casting machine, and performing a sulfur printing test on the sampled slab billet sample to obtain the thickness change of the billet shell in the crystallizer and/or the solidification coefficient in the crystallizer.
2. The method of claim 1, wherein melting and solidifying the sulfur powder to form a sulfur block comprises:
heating and melting the sulfur powder to obtain liquid sulfur;
and controlling the cooling speed of 0.8-1.8 ℃/min to cool and solidify the liquid sulfur to obtain the sulfur block.
3. The method of claim 2, wherein the loading the sulfur block into an aluminum can comprises:
cutting the solidified sulfur blocks into 200-300g sulfur small blocks, and filling into the aluminum can.
4. The method of claim 2, wherein said heating melts said sulfur powder to obtain liquid sulfur, comprising:
controlling the heating speed of 8-20 ℃/min to heat the sulfur powder;
and preserving heat for a preset time after heating for 6-15min to obtain the liquid sulfur.
5. The method according to claim 2, wherein during the heating melting and cooling solidification of the sulfur powder, a protective atmosphere is continuously introduced into the chamber for heating melting the sulfur powder so as to control the oxygen partial pressure in the atmosphere in the chamber to be less than 0.1%.
6. The method of claim 1, wherein the aluminum can is a cylinder with a diameter of 40 to 80mm and a height of 80 to 120mm.
7. The method of claim 1, wherein the total weight of sulfur added to said aluminum pot is determined by multiplying the area of said crystallizer by a conversion constant, wherein the conversion constant is a number in the range of 3 to 5.
8. The method of claim 1, wherein when the aluminum pot containing the sulfur block is fed into a mold of a continuous casting machine, the feeding is performed at a position in the mold that is: the width of the crystallizer is 1/8, the thickness of the crystallizer is 1/2, and the depth of the crystallizer is positioned in an impact area of a water gap.
9. The method of claim 1, wherein sampling the slab from the continuous casting machine and subjecting the slab samples to a sulfur print test to obtain a slab shell thickness variation in the mold and/or a solidification coefficient in the mold comprises:
after slab casting of the continuous casting machine is finished, taking a concave liquid surface when the aluminum tank is added into the crystallizer as an initial sampling position, taking 50-150 mm as a sampling interval, and sampling the continuous casting slab to obtain M slab samples with sulfur marks, wherein M is an integer greater than 1;
respectively carrying out sulfur print tests on the M plate blank samples to obtain corresponding M sulfur print photos;
and determining the blank shell thickness change in the crystallizer and/or the solidification coefficient in the crystallizer based on the sulfur print distribution state shown in the M sulfur print photos.
10. The utility model provides a billet shell quality testing equipment in crystallizer which characterized in that includes:
the sulfur processing device is used for melting and solidifying the sulfur powder to prepare a sulfur block;
the canning device is used for filling the sulfur blocks into an aluminum can;
the adding device is used for adding the aluminum tank filled with the sulfur blocks into a crystallizer of a continuous casting machine and controlling the time consumed for adding the sulfur blocks into the aluminum tank to be 1-2s;
and the detection device is used for sampling the continuous casting billet produced by the continuous casting machine and performing a sulfur print test on the taken slab sample so as to obtain the thickness change of the slab shell in the crystallizer and/or the solidification coefficient in the crystallizer.
CN202210703190.8A 2022-06-21 2022-06-21 Method and equipment for detecting quality of blank shell in crystallizer Pending CN115219521A (en)

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