CN113198993B - Method for reducing center segregation of low alloy steel continuous casting billet - Google Patents
Method for reducing center segregation of low alloy steel continuous casting billet Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
Abstract
The invention provides a method for reducing the center segregation of a low-alloy steel continuous casting blank, which aims at the problem of low internal segregation qualification rate of the low-alloy high-strength steel continuous casting blank. Firstly, according to continuous casting billet production data of a target continuous casting machine, analyzing to obtain a carbon equivalent range of a target steel type continuous casting billet qualified by center segregation of the target steel type continuous casting billet, performing inverse calculation on the component content of the target steel type continuous casting billet, and optimizing an optimal component content range of molten steel corresponding to the carbon equivalent of the target steel type in production and an optimal pouring parameter range of the target molten steel. Therefore, the low-alloy target steel continuous casting billet with qualified center segregation can be produced according to the optimal component content range and the optimal casting parameter range. The molten steel components and the pouring parameters are optimized according to the carbon equivalent range, and the production conditions for preparing the target steel type continuous casting billet with qualified internal segregation quality can be more accurately found out, so that the center segregation of the low alloy steel continuous casting billet can be effectively improved, and the internal segregation quality of the low alloy steel continuous casting billet is improved.
Description
Technical Field
The invention relates to the technical field of steelmaking continuous casting, in particular to a method for reducing center segregation of a low alloy steel continuous casting billet.
Background
Continuous casting is an important process in the modern metallurgical production flow, and the central solidification segregation phenomenon often occurs in the solidification process of a continuous casting billet, so that the central part of the continuous casting billet forms brittle structures such as martensite or bainite during rolling, and the mechanical property of steel is deteriorated. And the center segregation is usually accompanied with the generation of center porosity and center cracks, so that the internal density of the continuous casting billet and the mechanical property of steel are further reduced.
The low-alloy high-strength steel is the engineering structural steel with the largest usage amount in steel materials. When the low-alloy high-strength steel is produced, the center segregation phenomenon of the continuous casting billet is particularly serious, so that the quality qualification rate of the continuous casting billet is obviously reduced compared with that of common carbon steel.
Disclosure of Invention
The invention aims to provide a production control method for solving the problem of center segregation of a low alloy steel continuous casting billet on the premise of not changing the original soft reduction and secondary cooling parameters of a continuous casting machine, and the method can effectively improve the center segregation of the low alloy steel continuous casting billet and obviously improve the internal segregation quality of the low alloy steel continuous casting billet.
The method for reducing the center segregation of the low alloy steel continuous casting billet comprises the following steps: collecting center segregation detection data, composition data, pouring temperature and casting speed data of the steel type continuous casting billets, wherein the low-alloy steel type continuous casting billets with qualified center segregation detection results are target steel type continuous casting billets; obtaining a target carbon equivalent range suitable for the target continuous casting machine to produce according to the carbon equivalent of the target steel type continuous casting slab; according to the target steel grade carbon equivalent range, obtaining a component content range of the production target molten steel, a target steel grade pouring temperature range and a target pulling speed range; and preparing molten steel according to the component content range of the molten steel of the target steel grade and the pouring temperature range of the target steel grade, and pouring according to the drawing speed range of the target steel grade.
The method for reducing the center segregation of the low alloy steel continuous casting billet provided by the embodiment of the invention aims at solving the problem of low internal segregation qualification rate of the low alloy high strength steel continuous casting billet and improving the internal segregation quality of the low alloy steel continuous casting billet. Firstly, analyzing and obtaining the carbon equivalent range of a target steel type continuous casting billet with qualified segregation according to continuous casting billet production data, performing reverse calculation on the component content of the target steel type continuous casting billet, and optimizing the optimal component content range (the component content range of the target steel type molten steel) of the target steel type molten steel and the optimal pouring parameter range (the target pouring temperature range and the target pulling speed range) of the target steel type molten steel in production. Therefore, the low alloy steel continuous casting billet with qualified center segregation can be produced according to the optimal component content range and the optimal casting parameter range.
The carbon equivalent is the increase and decrease of carbon converted from the influence of various alloy elements in steel on the actual carbon content of the eutectic point, so that the carbon equivalent is related to the mass content of various elements, and compared with a single element, the carbon equivalent can better reflect the property of a target continuous casting billet and has more statistical significance.
Therefore, the method for reducing the center segregation of the low alloy steel continuous casting billet provided by the embodiment of the invention can effectively improve the center segregation of the low alloy steel continuous casting billet and improve the quality of the low alloy steel continuous casting billet.
In addition, the method for reducing the center segregation of the low alloy steel continuous casting billet according to the invention also has the following additional technical characteristics:
in some embodiments, the carbon equivalent of the target slab is obtained according to the molten steel composition of the target steel type slab and based on the following formula,
Ceq＝C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15，
wherein Ceq is carbon equivalent, and C, Mn, Cr, Mo, V, Ni and Cu are the mass contents of the elements in the target continuous casting slab.
In some embodiments, the target steel grade carbon equivalent range is less than the range of the original production plan carbon equivalent of the target steel grade slab.
In some embodiments, the ranges of the components of the molten steel of the target steel grade are obtained by back calculation according to the carbon equivalent range of the target steel grade and based on the following formula,
Ceq’＝C’+Mn’/6+(Cr’+Mo’+V’)/5+(Cu’+Ni’)/15，
wherein Ceq 'is the range of carbon equivalent, and C', Mn ', Cr', Mo ', V', Ni 'and Cu' are the mass content ranges of the element in the target steel grade molten steel.
In some embodiments, the number of the target steel grade continuous casting billets is greater than or equal to 20.
In some embodiments, the number of slabs of the target steel grade is 50 to 100.
In some embodiments, the method of reducing center segregation in a low alloy steel slab further comprises the steps of: and collecting continuous casting data, wherein the continuous casting data comprises the molten steel components of the steel type continuous casting billet, the pouring temperature, the casting speed of the continuous casting machine and the center segregation detection result of the steel type continuous casting billet.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow chart of a method for reducing center segregation of a low alloy steel continuous casting slab according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The method for reducing the center segregation of a low alloy steel continuous casting slab according to an embodiment of the present invention will be described with reference to fig. 1.
Step A: collecting a center segregation detection result, composition data, pouring temperature and casting speed data of the continuous casting billet, wherein the continuous casting billet with a qualified center segregation detection result is a target steel type continuous casting billet;
and B: obtaining a target steel grade carbon equivalent range according to the carbon equivalent of the target steel grade continuous casting billet;
and C: according to the target steel grade carbon equivalent range, obtaining a component content range corresponding to the target molten steel, a target steel grade pouring temperature range and a target steel grade pulling speed range; and
step D: and preparing molten steel according to the component content range of the target molten steel and the casting temperature range of the target steel grade, and then casting according to the casting speed range of the target steel grade.
As described above, the target steel type continuous casting slabs are first found out according to the center segregation detection results of the continuous casting slabs, and the center segregation detection results of the target continuous casting slabs are qualified. And calculating the carbon equivalent according to the found components of each target continuous casting billet, then obtaining the range of the carbon equivalent of the target continuous casting billet, finally obtaining the range of the carbon equivalent of the target steel grade, and simultaneously counting the pouring temperature and the drawing speed data of the target continuous casting billet. It is considered that, when the carbon equivalent of the prepared molten steel is within the target carbon equivalent range when the continuous cast slab is produced, the center segregation detection result of the continuous cast slab cast by the molten steel is qualified under certain conditions.
Subsequently, in step C, the content range of the components of the target molten steel is calculated from the target carbon equivalent range. And when the component content range of the molten steel is within the component content range of the target molten steel, the molten steel is the target molten steel. Alternatively, when preparing molten steel at the initial stage of casting, the component content range of molten steel is made to satisfy the above-described component content range of the target molten steel. Therefore, the carbon equivalent of the continuous casting billet cast by the molten steel is in the target carbon equivalent range, and the center segregation detection result of the continuous casting billet produced under certain conditions is qualified.
And in the step C, the pouring temperature and the drawing speed are essential process conditions in the production process of the low alloy steel continuous casting billet. And obtaining the range of the casting temperature of the target continuous casting billet, namely the target casting temperature range, according to the casting temperature corresponding to the target carbon equivalent range of the target continuous casting billet, and obtaining the range of the casting speed of the target continuous casting billet, namely the target casting speed range, according to the casting speed corresponding to the target carbon equivalent range of the target continuous casting billet. Therefore, in the step D, molten steel is prepared according to the component content range of the target molten steel and the target casting temperature range, and then casting is carried out according to the target casting speed range, so that the center segregation detection result of the continuous casting billet is qualified.
The inventor finds that the center segregation qualification rate of the produced low alloy steel continuous casting billet can reach 100% under the condition that the light reduction parameter of a continuous casting machine and the secondary cooling parameter of the continuous casting machine are not changed by carrying out actual production operation according to the method for reducing the center segregation of the low alloy steel continuous casting billet.
It is understood that the target carbon equivalent range, the target casting temperature range, and the target casting speed range correspond to the target slab. The target casting temperature range and the target casting speed range correspond to the target carbon equivalent range.
The method for reducing the center segregation of the low alloy steel continuous casting billet provided by the embodiment of the invention aims at the problem of low percent of pass of the internal segregation of the low alloy high strength steel continuous casting billet and aims at improving the internal segregation quality of the low alloy steel continuous casting billet. Firstly, analyzing and obtaining a carbon equivalent range of a target continuous casting billet which is qualified in segregation according to continuous casting billet production data, performing reverse calculation on the component content of the target continuous casting billet, optimizing an optimal component content range (component content range of the target molten steel) of the target molten steel in production, and then optimizing an optimal pouring parameter range (target pouring temperature range and target pulling speed range) of the target molten steel according to pouring parameters (pouring temperature and pulling speed) corresponding to the target carbon equivalent range of the target continuous casting billet. Therefore, the low alloy steel continuous casting billet with qualified center segregation can be produced according to the optimal component content range and the optimal casting parameter range.
The carbon equivalent is the increase and decrease of carbon converted from the influence of various alloy elements in steel on the actual carbon content of the eutectic point, so that the carbon equivalent is related to the mass content of various elements, and compared with a single element, the carbon equivalent can reflect the property of a target continuous casting billet and has more statistical significance.
Therefore, the method for reducing the center segregation of the low alloy steel continuous casting billet provided by the embodiment of the invention can effectively improve the center segregation of the low alloy steel continuous casting billet and improve the internal quality of the low alloy steel continuous casting billet.
The target carbon equivalent range may include one range, or may include a plurality of ranges. For example, statistical analysis of the carbon equivalent of the target slab results in a portion of the target slab having a carbon equivalent in a first range and another portion of the target slab having a carbon equivalent in a second range, the first range and the second range together constituting a target carbon equivalent range.
The method for reducing the center segregation of the low alloy steel continuous casting slab comprises the step of collecting continuous casting data, wherein the continuous casting data comprise the molten steel composition of the continuous casting slab, the pouring temperature, the drawing speed and the center segregation detection result.
In some embodiments, in step B, the carbon equivalent of the target slab is obtained according to the molten steel composition of the target slab and based on the following formula,
Ceq＝C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15 (1)
wherein Ceq is carbon equivalent, and C, Mn, Cr, Mo, V, Ni and Cu are the mass contents of the element in the molten steel of the target continuous casting billet. For example, C is the mass content of carbon element in the molten steel from which the target slab is produced.
That is, when calculating the carbon equivalent of the target slab, the content of each element in the target slab, that is, the content of the molten steel component for producing the target slab is known, and the carbon equivalent of the target slab can be calculated according to the formula (1) based on the content of each element.
In some embodiments, the number of target slabs is equal to or greater than 20, in order to make the statistics of the target slabs more reliable.
Preferably, the number of target slabs is 50-100, i.e. the number of target slabs is between 50-100, in order to optimize the reliability of the statistical results of the target slabs.
And B, obtaining a target carbon equivalent range which is smaller than or equal to the range of the carbon equivalent of the original production plan of the target continuous casting billet according to the carbon equivalent statistical analysis of the target continuous casting billet. In some embodiments, the target carbon equivalent range is less than the range of the target strand original production plan to exclude specific values from the original production plan range, such that the target carbon equivalent range is more satisfactory for continuous casting production quality.
In some embodiments, in step C, the target molten steel composition range is obtained by back calculation based on the following formula according to the target carbon equivalent range,
Ceq’＝C’+Mn’/6+(Cr’+Mo’+V’)/5+(Cu’+Ni’)/15 (2)
wherein Ceq 'is the range of carbon equivalent, and C', Mn ', Cr', Mo ', V', Ni 'and Cu' are the mass content ranges of the element in the target molten steel.
That is, when calculating the composition range of the target molten steel, the target carbon equivalent range is known, and from this target carbon equivalent range, the content range of each element in the target molten steel, that is, the composition range of the target molten steel can be calculated from the formula (2).
The following three examples further describe the method for reducing the center segregation of the low alloy steel continuous casting billet by taking a certain slab caster to produce high-strength boat deck steel AH36 as an example.
The first embodiment is as follows:
the original specific control process of the continuous casting machine is as follows:
(1) AH36 steel production composition control range
The caster was operated according to table 1 for the production of high strength boat plate steel AH 36.
TABLE 1 high-Strength Ship plate Steel AH36 ingredient/wt.%
(2) Molten AH36 steel casting temperature and continuous casting machine pulling speed
When the continuous casting machine is used for producing high-strength ship plate steel AH36, the casting temperature and the pulling speed of the continuous casting machine are shown in table 2.
TABLE 2 continuous casting parameters for original production of high strength deck steel AH36
| Target carbon equivalent range | Test molten steel pouring temperature/. degree.C | Test casting machine pulling speed/m/min |
| [Ceq]＝0.3-0.4 | 1525-1550 | 1.3-1.6 |
(3) Production operation execution
And (3) preparing AH36 molten steel meeting the temperature conditions (1525-1550 ℃) and the component requirements in production scheduling, pouring according to the pulling speed (1.3-1.6 m/min) of a continuous casting machine in the table 2, and finally obtaining the AH36 steel casting blank with the B0.5 grade qualification rate of central segregation of 75% under the set conditions of original soft reduction and secondary cooling.
Example two:
in this embodiment, the production control steps of the continuous casting machine for producing AH36 slabs include:
(1) finding out a target continuous casting billet according to a center segregation detection result of an AH36 slab in historical production data;
(2) calculating the carbon equivalent of the target continuous casting billet according to the formula (1), and obtaining that when [ Ceq ] <0.35, slab center segregation can reach B0.5 grade qualification rate 100% under certain conditions, namely the target carbon equivalent range comprises [ Ceq ] <0.35 according to the statistical analysis of the carbon equivalent of the target continuous casting billet;
(3) according to the target carbon equivalent range of [ Ceq ] <0.35, the optimal content range of the components of the AH36 steel is determined by inverse calculation based on the formula (2), namely the component content range of the target molten steel is obtained, and the component content range of the target molten steel is shown in table 3;
TABLE 3 content ranges/wt% of components of target molten steel
(4) Through statistical analysis of production data (pouring temperature and pulling speed) when [ Ceq ] <0.35, the pouring temperature of the tundish is determined to be 1530-1540 ℃, the pulling speed is 1.3-1.6m/min, and the B0.5-level center segregation in the slab can be effectively controlled. Therefore, the target casting temperature range and the target pulling speed range of the AH36 steel slab produced by the continuous casting machine are determined, and the specific scheme is shown in Table 4.
TABLE 4 continuous casting parameters for producing high-strength ship plate steel AH36
| Target carbon equivalent range | Target casting temperature range/. degree.C | Target pull rate range/m/min |
| [Ceq]＝0.3-0.35 | 1530-1540 | 1.3-1.6 |
(5) And preparing AH36 molten steel meeting the optimized temperature conditions in the table 4 and the component requirements in the table 3 in production scheduling, pouring according to the pulling speed of the continuous casting machine optimized in the table 4, and finally obtaining an AH36 steel casting blank with the central segregation B0.5 grade qualification rate of 100% under the original soft reduction and secondary cooling set conditions.
Example three:
in this embodiment, the production control steps of the continuous casting machine for producing AH36 slabs include:
(1) finding out a target continuous casting billet according to a center segregation detection result of an AH36 slab in historical production data;
(2) calculating the carbon equivalent of the target continuous casting billet according to the formula (1), and obtaining the B0.5-level qualification rate of 100% by carrying out statistical analysis on the carbon equivalent of the target continuous casting billet according to the carbon equivalent of the target continuous casting billet when [ Ceq ] >0.37 under certain conditions, namely the target carbon equivalent range also comprises [ Ceq ] > 0.37;
(3) determining the optimal content range of the components of the AH36 steel by inverse calculation based on a formula (2) according to the target carbon equivalent range of [ Ceq ] >0.37 to obtain the content range of the components of the target molten steel, wherein the content range of the components of the target molten steel is shown in Table 5;
TABLE 5 content ranges/wt% of components of target molten steel
(4) Through statistical analysis of production data (pouring temperature and pulling speed) when [ Ceq ] is greater than 0.37, the pouring temperature of the tundish is determined to be 1535-1545 ℃, the pulling speed is 1.3-1.6m/min, and the B0.5-level center segregation in the slab can be effectively controlled. Therefore, the target casting temperature range and the target pulling speed range of the AH36 steel slab produced by the continuous casting machine are determined, and the specific scheme is shown in Table 6.
TABLE 6 continuous casting parameters for producing high-strength ship plate steel AH36
| Target carbon equivalent range | Target casting temperature range/. degree.C | Target pull rate range/m/min |
| [Ceq]＝0.37-0.4 | 1535-1545 | 1.3-1.6 |
(5) And preparing AH36 molten steel meeting the optimized temperature conditions in the table 6 and the component requirements in the table 5 in production scheduling, pouring according to the pulling speed of the continuous casting machine optimized in the table 6, and finally obtaining an AH36 steel casting blank with the central segregation B0.5 grade qualification rate of 100% under the original soft reduction and secondary cooling set conditions.
According to the method for reducing the center segregation of the low alloy steel continuous casting slab provided by the embodiment of the invention, production data collection, quality tracking and setting calculation are carried out, control is carried out on steel components and pouring parameters, and the optimal control process of continuous casting production is guided for guiding the optimal operation of continuous casting machine production, so that the method has the advantages that:
(1) on the premise of ensuring the capability of continuous casting equipment, producing a casting blank with the center segregation qualification rate of 100%;
(2) the method is simple and reasonable, economic and efficient, and by adopting the method for reducing the center segregation of the low alloy steel continuous casting billet provided by the embodiment of the invention, the effect of a soft reduction process can be fully exerted, the center segregation of the low alloy steel continuous casting billet is obviously improved, and the internal quality of the casting billet is improved;
(3) the design production capacity of the continuous casting machine is fully exerted, the optimal control level of the internal quality of the continuous casting machine is achieved, casting blank judgment caused by the segregation quality problem is reduced, the casting blank yield is improved, and the product competitiveness is enhanced.
In the description of the present invention, it is to be understood that,
in the present invention, the terms "three embodiments", "the present embodiment", "example", "specific example" and the like mean that a specific feature or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. The method for reducing the center segregation of the low alloy steel continuous casting billet is characterized by comprising the following steps of:
collecting center segregation detection data, composition data, pouring temperature and casting speed data of a steel type continuous casting billet, wherein the steel type continuous casting billet with a qualified center segregation detection result is a target steel type continuous casting billet;
obtaining a range suitable for the target continuous casting machine to produce the carbon equivalent of the target steel type according to the carbon equivalent of the target steel type continuous casting slab;
according to the target steel grade carbon equivalent range, obtaining a component content range of the production target molten steel, a target steel grade pouring temperature range and a target steel grade pulling speed range;
and preparing molten steel according to the component content range of the target molten steel and the casting temperature range of the target steel grade, and then casting according to the casting speed range of the target steel grade.
2. The method for reducing the center segregation of a low alloy steel slab as set forth in claim 1, wherein the carbon equivalent of the slab of the target steel grade is obtained from the composition of molten steel of the slab of the target steel grade based on the following formula,
Ceq＝C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15，
wherein Ceq is carbon equivalent, and C, Mn, Cr, Mo, V, Ni and Cu are the mass contents of the elements in the molten steel of the target steel grade continuous casting billet.
3. The method for reducing the center segregation of a low alloy steel slab as set forth in claim 1 or 2, wherein the range of the target steel grade carbon equivalent is smaller than the range of the original production plan carbon equivalent of the slab of the target steel grade.
4. The method for reducing the center segregation of a low alloy steel continuous casting slab according to claim 1 or 2, wherein the range of the composition of the target molten steel is obtained by inverse calculation based on the following formula according to the range of the carbon equivalent of the target steel grade,
Ceq’＝C’+Mn’/6+(Cr’+Mo’+V’)/5+(Cu’+Ni’)/15，
wherein Ceq 'is the range of carbon equivalent, and C', Mn ', Cr', Mo ', V', Ni 'and Cu' are the mass content ranges of the element in the target molten steel.
5. The method for reducing the center segregation of a low alloy steel slab as set forth in claim 1, wherein the number of the target slabs is 20 or more.
6. The method for reducing the center segregation of a low alloy steel slab as set forth in claim 5, wherein the number of the target slabs is 50 to 100.
7. The method for reducing the center segregation of the low alloy steel continuous casting slab as claimed in claim 1, wherein the method comprises the following steps:
and collecting continuous casting data, wherein the continuous casting data comprise the molten steel components of the steel type continuous casting billet, the pouring temperature, the casting speed and the center segregation detection result of the steel type continuous casting billet.
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