CN114985692A - Continuous casting control method for improving center segregation of round billet - Google Patents
Continuous casting control method for improving center segregation of round billet Download PDFInfo
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- CN114985692A CN114985692A CN202210604774.XA CN202210604774A CN114985692A CN 114985692 A CN114985692 A CN 114985692A CN 202210604774 A CN202210604774 A CN 202210604774A CN 114985692 A CN114985692 A CN 114985692A
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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
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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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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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
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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
Abstract
The invention discloses a continuous casting control method for improving center segregation of a round billet, aiming at the process and parameters of continuous casting production of low-carbon steel of the round billet, comprising the following steps of: the drawing speed of the continuous casting production process is 1.0-3.0 m/min; the superheat degree of the continuous casting production process is 20-30 ℃; the electromagnetic stirring current of the crystallizer in the continuous casting production process is 100-300A, and the frequency is 2-6 HZ; the electromagnetic stirring current at the end of the continuous casting production process is 150-350A, and the frequency is 3-12 HZ. The invention aims to provide a continuous casting control method for improving the center segregation of a round billet, which improves the center segregation of the round billet by controlling the drawing speed, the superheat degree, the electromagnetic stirring of a crystallizer and the electromagnetic stirring of the tail end of a continuous casting process.
Description
Technical Field
The invention relates to a continuous casting control method for improving center segregation of a round billet.
Background
With the shift of continuous casting steel grade to high-quality steel grade, the requirements on the internal quality of the casting blank, particularly on the refinement and homogenization of the solidification structure of the casting blank, are continuously improved, thereby reflecting the importance of the continuous casting process. The low superheat degree can realize high drawing speed, the internal quality of a casting blank is improved, and the tapping temperature can be reduced; the electromagnetic stirring of the crystallizer can reduce the superheat degree of the molten steel, shorten the solidification time, increase the equiaxial crystal rate and reduce the center segregation; the electromagnetic stirring at the tail end can further refine isometric crystals and improve the problems of casting blank center segregation, center shrinkage cavity, looseness and the like. Therefore, aiming at the round billet low-carbon steel with different sections, the central segregation of the round billet is improved by controlling the superheat degree, the drawing speed, the electromagnetic stirring of the crystallizer and the electromagnetic stirring of the tail end of the continuous casting production process.
The Chinese patent with the application number of 201611241049.1 discloses a carbon segregation control method for a continuous casting round billet for a wheel, which reduces the difference range of the actual content and the target content of each chemical component in molten steel, and can reduce the chemical component deviation of molten steel in upper and lower furnaces in the continuous casting process, thereby achieving the purpose that the smelting chemical components of the tundish of the above furnaces are basically consistent, and being beneficial to controlling the component uniformity on the cross section of the round billet for the continuous casting of the steel of the medium and high carbon wheel.
The Chinese patent with the application number of 201210039431.X discloses a method for improving center segregation and shrinkage cavity of a square and round billet, which is characterized in that when a casting billet is cooled, a cooling mode that the cooling strength of the casting billet in the inner arc direction and the outer arc direction is consistent, the cooling strength of the casting billet in the left side direction and the right side direction is consistent, and the cooling strength of the casting billet in the inner arc direction and the cooling strength of the casting billet in the outer arc direction are greater than the cooling strength of the casting billet in the left side direction and the right side direction is adopted, so that the growth rate of a solidified shell in the inner arc direction and the outer arc direction of the casting billet is relatively high, and the growth rate of the casting billet in the left side direction and the right side direction is relatively low, so that a liquid core at the solidified tail end of the casting billet is a long area which is flattened in the inner arc direction and the outer arc direction and is elongated in the left side direction and the right side direction. By controlling the distribution mode of segregation solute elements and solidification shrinkage, the small-range segregation enrichment of the center of a casting blank is avoided, so that the center segregation and shrinkage cavity of continuous casting blanks with similar section width and thickness sizes, such as square and round blanks, are effectively improved, and the implementation of a continuous casting dynamic soft reduction technology and a tail end electromagnetic stirring technology is facilitated.
The Chinese patent with the application number of 201810898200.1 discloses a production method of a low segregation 42CrMo4 series continuous casting round billet, wherein in the continuous casting process, the superheat degree of molten steel is controlled at 15-25 ℃, the continuous casting crystallizer is electromagnetically stirred for 100A-300A, the tail end is electromagnetically stirred for 100A-400A, the frequency is 2-8HZ, and the specific water amount of a secondary cooling zone is 0.10-0.30L/kg. The method controls the lower degree of superheat and is beneficial to reducing the carbon segregation tendency. The method reasonably utilizes the crystallizer and the electromagnetic stirring at the tail end, controls the isometric crystal rate of the casting blank, refines the solidification structure, reduces the carbon segregation electromagnetic stirring, can inhibit the growth of columnar crystals, improves the isometric crystal rate on the section of the casting blank, enables the segregation elements to be uniformly distributed among the isometric crystals, and avoids the aggregation of solute elements. The method can obtain finer crystal structure by increasing the secondary cooling strength, effectively reduce the local solidification times and alleviate the carbon segregation.
Disclosure of Invention
The invention aims to provide a continuous casting control method for improving the center segregation of a round billet, which improves the center segregation of the round billet by controlling the drawing speed, the superheat degree, the electromagnetic stirring of a crystallizer and the electromagnetic stirring of the tail end of a continuous casting process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a continuous casting control method for improving center segregation of a round billet, aiming at the process and parameters of the continuous casting production of low-carbon steel of the round billet, comprising the following steps of:
the drawing speed of the continuous casting production process is 1.0-3.0 m/min;
the superheat degree of the continuous casting production process is 20-30 ℃;
the electromagnetic stirring current of the crystallizer in the continuous casting production process is 100-300A, and the frequency is 2-6 HZ;
the electromagnetic stirring current at the end of the continuous casting production process is 150-350A, and the frequency is 3-12 HZ.
Further, regarding a round billet cross section sample, taking a sample by adopting a drill bit with the diameter of phi 6mm every 15mm from an inner arc to an outer arc, taking a plurality of points, and analyzing the content of segregation elements in each sample by adopting a chemical method;
calculating a segregation index by adopting the following formula according to the content of each element of the casting blank, and analyzing the macrosegregation degree of the casting blank: the segregation index is the segregation element content at the drilling sample position/the average segregation element content of all the drilling sample points of the casting blank.
Furthermore, the casting production process has the drawing speed of 1.5 m/min.
Furthermore, the superheat degree of the continuous casting production process is 24 ℃.
Furthermore, the electromagnetic stirring current of the crystallizer in the continuous casting production process is 150A, and the frequency is 3 HZ.
Further, the electromagnetic stirring current at the tail end of the continuous casting production process is 200A, and the frequency is 11 HZ.
Further, 13 points were taken.
Further, the specification of the round billet is phi 180-300 mm.
Furthermore, the drawing speed of the continuous casting production process is 1.2 m/min; the superheat degree of the continuous casting production process is 25 ℃; the electromagnetic stirring current of the crystallizer in the continuous casting production process is 300A, and the frequency is 2 HZ; the electromagnetic stirring current at the tail end of the continuous casting production process is 250A, and the frequency is 10 HZ.
Compared with the prior art, the invention has the beneficial technical effects that:
aiming at the continuous casting production process of round billets with different sections of low-carbon steel, the invention improves the center segregation of the round billets and the internal quality of the casting billets by controlling the drawing speed, the superheat degree, the electromagnetic stirring parameters of the crystallizer and the electromagnetic stirring parameters of the tail end, and provides powerful guarantee for the subsequent rolling production process. The method has simple and effective control measures, low cost and wide application prospect.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a drawing of a casting blank sample drilling position;
FIG. 2 is a carbon segregation index of a cast slab of example 1;
FIG. 3 is a carbon segregation index of the cast slab of example 2.
Detailed Description
Example 1:
a continuous casting control method for improving center segregation of a round billet aims at the continuous casting production process parameters of a 12Cr1MoVG round billet with the diameter of 210 mm:
the drawing speed of the continuous casting production process is 1.5 m/min.
The superheat degree of the continuous casting production process is 24 ℃.
The electromagnetic stirring current of the crystallizer in the continuous casting production process is 150A, and the frequency is 3 HZ.
The electromagnetic stirring current at the tail end of the continuous casting production process is 200A, and the frequency is 11 HZ.
And (3) taking one sample by adopting a drill bit with the diameter of 6mm every 15mm from the inner arc to the outer arc aiming at the round billet cross section sample, taking 13 points in total, and analyzing the content of the carbon element in each sample by adopting a chemical method.
And calculating the segregation index by adopting a formula according to the content of the carbon element of each point of the casting blank, wherein the central carbon segregation index of the casting blank is 1.08, and the carbon element is basically uniformly distributed.
Example 2:
a continuous casting control method for improving center segregation of a round billet aims at the technical parameters of 20# continuous casting production of a round billet with a diameter of 270 mm:
the drawing speed of the continuous casting production process is 1.2 m/min.
The superheat degree of the continuous casting production process is 25 ℃.
The electromagnetic stirring current of the crystallizer in the continuous casting production process is 300A, and the frequency is 2 HZ.
The electromagnetic stirring current at the tail end of the continuous casting production process is 250A, and the frequency is 10 HZ.
And (2) taking one sample by adopting a drill bit with the diameter of 6mm every 15mm from the inner arc to the outer arc aiming at the sample of the cross section of the round billet, taking 17 points in total, and analyzing the content of the carbon element in each sample by adopting a chemical method.
And calculating the segregation index by adopting a formula, wherein the segregation index of the central carbon of the casting blank is 1.07, and the distribution of the carbon elements is basically uniform.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (9)
1. A continuous casting control method for improving center segregation of a round billet is characterized by comprising the following steps: the process and parameters for continuous casting production of round billet low-carbon steel comprise:
the drawing speed of the continuous casting production process is 1.0-3.0 m/min;
the superheat degree of the continuous casting production process is 20-30 ℃;
the electromagnetic stirring current of the crystallizer in the continuous casting production process is 100-300A, and the frequency is 2-6 HZ;
the electromagnetic stirring current at the end of the continuous casting production process is 150-350A, and the frequency is 3-12 HZ.
2. The continuous casting control method for improving center segregation of a round billet according to claim 1, wherein: aiming at a round billet cross section sample, taking a sample by using a drill bit with the diameter of phi 6mm every 15mm from an inner arc to an outer arc, taking a plurality of points, and analyzing the content of segregation elements in each sample by using a chemical method;
calculating a segregation index by adopting the following formula according to the content of each element of the casting blank, and analyzing the macrosegregation degree of the casting blank: the segregation index is the segregation element content at the drilling sample position/the average segregation element content of all the drilling sample points of the casting blank.
3. The continuous casting control method for improving center segregation of a round billet according to claim 1, wherein: the casting production process has the drawing speed of 1.5 m/min.
4. The continuous casting control method for improving center segregation of a round billet according to claim 3, wherein: the superheat degree of the continuous casting production process is 24 ℃.
5. The continuous casting control method for improving center segregation of a round billet according to claim 4, wherein: the electromagnetic stirring current of the crystallizer in the continuous casting production process is 150A, and the frequency is 3 HZ.
6. The continuous casting control method for improving center segregation of a round billet according to claim 5, wherein: the electromagnetic stirring current at the tail end of the continuous casting production process is 200A, and the frequency is 11 HZ.
7. The continuous casting control method for improving center segregation of a round billet according to claim 6, wherein: take 13 points.
8. The continuous casting control method for improving center segregation of a round billet according to claim 1, wherein: the specification of the round billet is phi 180-300 mm.
9. The continuous casting control method for improving center segregation of a round billet according to claim 1, wherein: the drawing speed of the continuous casting production process is 1.2 m/min; the superheat degree of the continuous casting production process is 25 ℃; the electromagnetic stirring current of the crystallizer in the continuous casting production process is 300A, and the frequency is 2 HZ; the electromagnetic stirring current at the tail end of the continuous casting production process is 250A, and the frequency is 10 HZ.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769535A (en) * | 2022-04-24 | 2022-07-22 | 芜湖新兴铸管有限责任公司 | Method for reducing carbon steel segregation range in round billet by high-frequency pulse current and tail end electromagnetic stirring composite technology |
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| KR20010056162A (en) * | 1999-12-14 | 2001-07-04 | 이구택 | Method for electro-magnetic stirring molten steel to reducing center segregation at continuous casting |
| CN103934423A (en) * | 2014-04-03 | 2014-07-23 | 莱芜钢铁集团有限公司 | Method for producing continuous casting round billet of wind power tower cylinder flange steel |
| CN105603302A (en) * | 2016-03-23 | 2016-05-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Phi350mm 34CrMo circular tube steel blank and smelting method thereof |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20010056162A (en) * | 1999-12-14 | 2001-07-04 | 이구택 | Method for electro-magnetic stirring molten steel to reducing center segregation at continuous casting |
| CN103934423A (en) * | 2014-04-03 | 2014-07-23 | 莱芜钢铁集团有限公司 | Method for producing continuous casting round billet of wind power tower cylinder flange steel |
| CN105603302A (en) * | 2016-03-23 | 2016-05-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Phi350mm 34CrMo circular tube steel blank and smelting method thereof |
| CN108672666A (en) * | 2018-05-24 | 2018-10-19 | 江苏省沙钢钢铁研究院有限公司 | Improve the continuous cast method of round billet spring steel 60Si2CrVAT center segregations |
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Non-Patent Citations (1)
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| 李颇;张程;申祖峰;: "连铸工艺对风电用42CrMo4连铸圆坯内部质量影响的研究", 特钢技术, no. 03, pages 205 - 206 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114769535A (en) * | 2022-04-24 | 2022-07-22 | 芜湖新兴铸管有限责任公司 | Method for reducing carbon steel segregation range in round billet by high-frequency pulse current and tail end electromagnetic stirring composite technology |
| CN114769535B (en) * | 2022-04-24 | 2023-11-24 | 芜湖新兴铸管有限责任公司 | Method for reducing carbon segregation limit of carbon steel in round billet by high-frequency pulse current and terminal electromagnetic stirring composite technology |
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