CN115301908A - Method for improving internal structure of round billet by adopting tail end electromagnetic stirring - Google Patents
Method for improving internal structure of round billet by adopting tail end electromagnetic stirring Download PDFInfo
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- CN115301908A CN115301908A CN202210963985.2A CN202210963985A CN115301908A CN 115301908 A CN115301908 A CN 115301908A CN 202210963985 A CN202210963985 A CN 202210963985A CN 115301908 A CN115301908 A CN 115301908A
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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
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Abstract
The invention discloses a method for improving the internal structure of a round billet by adopting tail end electromagnetic stirring, which comprises the following steps: 1) And selecting a round billet continuous casting machine with a crystallizer electromagnetic stirring device. 2) The magnetic field form of the tail end electromagnetic stirring device is a rotating magnetic field, the central magnetic induction intensity is more than 600GS, and the effective stirring length is 500-600mm; 3) When low-carbon steel is produced by aiming at a round billet continuous casting machine with different sections, the section is phi 180-300mm, the electromagnetic stirring current at the tail end is 150-350A, and the frequency is 3-12HZ. The invention aims to provide a method for improving the internal structure of a round billet by adopting tail end electromagnetic stirring, which improves the internal quality of the round billet by adding a control method of tail end electromagnetic stirring on the premise that a round billet continuous casting machine is provided with crystallizer electromagnetic stirring.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for improving the internal structure of a round billet by adopting tail end electromagnetic stirring.
Background
In order to improve the product quality and market competitiveness, the internal quality of a casting blank needs to be continuously improved in a steelmaking process so as to provide a high-quality raw material for a rolling process, and the electromagnetic stirring effect of a crystallizer with a single continuous casting process cannot meet the requirement of a new steel grade on the quality of the casting blank, so that the importance of electromagnetic stirring at the solidification tail end is reflected. Electromagnetic stirring at the solidification end has the effects of breaking columnar crystal bridging, dispersing concentrated molten steel, enlarging equiaxed crystal regions, improving central segregation and reducing central porosity and shrinkage cavity. Therefore, on the premise that the round billet continuous casting machine is provided with the crystallizer electromagnetic stirring, the internal quality of the round billet is evaluated by adding a control method of end electromagnetic stirring according to the sulfur imprint result and the central equiaxial crystal rate, and finally the internal quality of the round billet is improved.
The Chinese patent with the application number of 200910092048.9 discloses a method and an electromagnetic stirring device for improving the internal structure of a continuous casting blank, wherein electromagnetic stirring is carried out at the tail end of a liquid core of the continuous casting blank on a second cooling section of a continuous casting machine to generate forward and reverse alternating spiral rotating force, the force enables molten steel to rotate and flow along the casting direction of the continuous casting machine, and static pressure is added to a solid-liquid phase area at the tail end of the liquid core. By adopting the method and the electromagnetic stirring device, enough molten steel can be provided to supplement the volume shrinkage of the liquid core during solidification, and shrinkage cavities and looseness are eliminated, so that the quality of the continuous casting billet is improved.
The Chinese patent with the application number of 201610537522.4 discloses a vertical electromagnetic stirring method for controlling the center quality of a casting blank, wherein a travelling wave magnetic field type stirrer is arranged on the side surface of the casting blank in the continuous casting production process, and the overall direction of electromagnetic force generated in the casting blank is parallel to the direction of the center line of the casting blank. And the traveling wave magnetic field type electromagnetic stirrers with different shapes can be selected according to different shapes and sizes of the sections of the casting blanks. The power frequency of the vertical electromagnetic stirrer is 0.5-50HZ, and the current is 50-3000A. The melt in the central area of the casting blank can generate upward or downward forced convection motion along the central line of the casting blank, the effective action area of electromagnetic stirring along the length direction of the casting blank is improved, the mixing of an upper high-temperature melt area and a lower low-temperature melt area in the central area of the casting blank is strengthened, the feeding capacity of the upper melt in the central area of the casting blank to the lower melt during solidification is improved, and the homogenization of the temperature and solute distribution in the casting blank is promoted.
The Chinese patent with the application number of 201510060782.2 discloses a dynamic control method and a dynamic control device for the electromagnetic stirring position of a steel continuous casting solidification end, which are used for calculating the displacement required by an electromagnetic stirrer at the solidification end in real time through comparison of the current electromagnetic stirring position and the optimal electromagnetic stirring position and ensuring that the electromagnetic stirrer at the solidification end is always positioned at the optimal stirring position of a poured steel grade. The problem that the traditional solidification tail end electromagnetic device cannot be adjusted in real time along with the continuous casting process is solved well, and the field implementation effect is good.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a method for improving the internal structure of a round billet by using terminal electromagnetic stirring, which improves the internal quality of the round billet by adding a control method of terminal electromagnetic stirring on the premise that a round billet continuous casting machine has crystallizer electromagnetic stirring.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for improving the internal structure of a round billet by adopting tail end electromagnetic stirring, which comprises the following steps:
1) And selecting a round billet continuous casting machine with a crystallizer electromagnetic stirring device.
2) The magnetic field form of the tail end electromagnetic stirring device is a rotating magnetic field, the central magnetic induction intensity is more than 600GS, and the effective stirring length is 500-600mm;
3) When low-carbon steel is produced by aiming at a round billet continuous casting machine with different sections, the section is phi 180-300mm, the electromagnetic stirring current at the tail end is 150-350A, and the frequency is 3-12HZ.
Further, the method also comprises the following steps: preparing a sample of the cross section of the round billet, heating the sample to 50 ℃ by adopting 50% hydrochloric acid, putting the sample into hot acid, boiling the sample for 20min, taking out the sample, flushing the hydrochloric acid on the surface of the sample by using clear water, and finally drying the surface of the sample by using an air pipe; measuring the size of an equiaxed crystal area in the center of the cross section of the casting blank; and comprehensively evaluating the internal quality of the casting blank according to the sulfur imprint result and the central equiaxed crystal rate.
Further, when a round billet continuous casting machine with the diameter of 270mm is adopted to produce 20#, the electromagnetic stirring current at the tail end is 250A, and the frequency is 10HZ.
Further, when a round billet continuous casting machine with the diameter of 210mm is adopted to produce 12Cr1MoVG, the electromagnetic stirring current at the tail end is 200A, and the frequency is 11HZ.
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 internal quality of the round billets is evaluated by adding a control method of electromagnetic stirring at the tail end and taking a sulfur print result and the central equiaxed crystal rate as the basis, and finally the internal quality of the round billets is improved.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 shows the hot acid results of the cast slab of example 1;
FIG. 2 shows the hot acid results of the cast slab of example 2.
Detailed Description
Example 1:
1. the round billet continuous casting machine has the electromagnetic stirring function of the crystallizer.
2. The magnetic field form of the tail end electromagnetic stirring device is a rotating magnetic field, the central magnetic induction intensity is more than 600GS, and the effective stirring length is 500-600mm.
3. When 12Cr1MoVG is produced by aiming at a round billet continuous casting machine with the diameter of 210mm, the electromagnetic stirring current at the tail end is 200A, and the frequency is 11HZ.
4. And (2) heating a sample with the cross section of the round billet to 50 ℃ by adopting 50% hydrochloric acid, putting the sample into hot acid, boiling for 20min, taking out the sample, flushing the hydrochloric acid on the surface of the sample by using clear water, and finally drying the surface of the sample by using an air pipe.
5. The hot acid results of the round billet are shown in fig. 1, and the dimensions of the equiaxed crystal region at the center of the cross section of the round billet and the sulfur imprint results are shown in table 1.
Table 1 dimensions of the central equiaxed region of the ingot of example 1
6. The length range of the isometric crystal area at the center of the casting blank is 65-70 mm, the central isometric crystal rate is 30.95-33.33%, the sulfur imprint results of the casting blank are all 0 and 1 grade, and the internal quality of the casting blank is better.
Example 2:
1. the round billet continuous casting machine has the electromagnetic stirring function of the crystallizer.
2. The magnetic field form of the tail end electromagnetic stirring device is a rotating magnetic field, the central magnetic induction intensity is more than 600GS, and the effective stirring length is 500-600mm.
3. When 20# is produced by aiming at a phi 270mm round billet continuous casting machine, the electromagnetic stirring current at the tail end is 250A, and the frequency is 10HZ.
4. And (2) heating a sample with the cross section of the round billet to 50 ℃ by adopting 50% hydrochloric acid, putting the sample into hot acid, boiling for 20min, taking out the sample, flushing the hydrochloric acid on the surface of the sample by using clear water, and finally drying the surface of the sample by using an air pipe.
5. The hot acid results of the round billet are shown in fig. 2, and the dimensions of the equiaxed crystal region at the center of the cross section of the round billet and the sulfur imprint results are shown in table 2.
Table 2 example 2 the dimensions of the central equiaxed region of the ingot
6. The length range of the equiaxial crystal zone at the center of the casting blank is 96-107 mm, the central equiaxial crystal rate is 36.67-39.44%, the sulfur mark results of the casting blank are all 0 and 1 grade, and the internal quality of the casting blank is better.
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 (4)
1. A method for improving the internal structure of a round billet by adopting tail-end electromagnetic stirring is characterized by comprising the following steps: the method comprises the following steps:
1) Selecting a round billet continuous casting machine with a crystallizer electromagnetic stirring device;
2) The magnetic field form of the tail end electromagnetic stirring device is a rotating magnetic field, the central magnetic induction intensity is more than 600GS, and the effective stirring length is 500-600mm;
3) When low-carbon steel is produced by aiming at a round billet continuous casting machine with different sections, the section is phi 180-300mm, the electromagnetic stirring current at the tail end is 150-350A, and the frequency is 3-12HZ.
2. The method for improving the internal structure of the round billet by adopting the tail end electromagnetic stirring as claimed in claim 1, which is characterized in that: further comprising: preparing a sample of the cross section of the round billet, heating the sample to 50 ℃ by adopting 50% hydrochloric acid, putting the sample into hot acid, boiling the sample for 20min, taking out the sample, flushing the hydrochloric acid on the surface of the sample by using clear water, and finally drying the surface of the sample by using an air pipe; measuring the size of an equiaxial crystal area at the center of the cross section of the casting blank; and comprehensively evaluating the internal quality of the casting blank according to the sulfur imprint result and the central equiaxed crystal rate.
3. The method for improving the internal structure of the round billet by adopting the tail end electromagnetic stirring as claimed in claim 1, which is characterized in that: when a phi 270mm round billet continuous casting machine is adopted to produce 20#, the electromagnetic stirring current at the tail end is 250A, and the frequency is 10HZ.
4. The method for improving the internal structure of the round billet by adopting the tail end electromagnetic stirring as claimed in claim 1, which is characterized in that: when the round billet continuous casting machine with the diameter of 210mm is adopted to produce 12Cr1MoVG, the electromagnetic stirring current at the tail end is 200A, and the frequency is 11HZ.
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Citations (7)
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|---|---|---|---|---|
| JPH10128510A (en) * | 1996-10-23 | 1998-05-19 | Nkk Corp | Method for continuously casting steel |
| CN101397628A (en) * | 2007-09-25 | 2009-04-01 | 宝山钢铁股份有限公司 | Continuous casting bearing steel round steel and method for producing the same |
| CN101642802A (en) * | 2009-09-07 | 2010-02-10 | 中冶京诚工程技术有限公司 | Method for improving internal organization of casting blank of continuous casting machine and electromagnetic stirring device |
| CN201482950U (en) * | 2009-09-07 | 2010-05-26 | 中冶京诚工程技术有限公司 | Electromagnetic stirring device for improving internal structure of ingot blank obtained by continuous casting machine |
| CN105603301A (en) * | 2016-03-23 | 2016-05-25 | 攀钢集团攀枝花钢铁研究院有限公司 | 30CrMo circular tube billet steel casting blank internal quality control method |
| WO2018086394A1 (en) * | 2016-11-09 | 2018-05-17 | 江阴兴澄特种钢铁有限公司 | Process for producing ls-crnimo30c steel forging using continuous casting billet for subsea oil production wellhead device |
| CN113134585A (en) * | 2021-04-20 | 2021-07-20 | 东北大学 | Homogenization square billet continuous casting production method under action of outfield cooperative control |
-
2022
- 2022-08-11 CN CN202210963985.2A patent/CN115301908A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10128510A (en) * | 1996-10-23 | 1998-05-19 | Nkk Corp | Method for continuously casting steel |
| CN101397628A (en) * | 2007-09-25 | 2009-04-01 | 宝山钢铁股份有限公司 | Continuous casting bearing steel round steel and method for producing the same |
| CN101642802A (en) * | 2009-09-07 | 2010-02-10 | 中冶京诚工程技术有限公司 | Method for improving internal organization of casting blank of continuous casting machine and electromagnetic stirring device |
| CN201482950U (en) * | 2009-09-07 | 2010-05-26 | 中冶京诚工程技术有限公司 | Electromagnetic stirring device for improving internal structure of ingot blank obtained by continuous casting machine |
| CN105603301A (en) * | 2016-03-23 | 2016-05-25 | 攀钢集团攀枝花钢铁研究院有限公司 | 30CrMo circular tube billet steel casting blank internal quality control method |
| WO2018086394A1 (en) * | 2016-11-09 | 2018-05-17 | 江阴兴澄特种钢铁有限公司 | Process for producing ls-crnimo30c steel forging using continuous casting billet for subsea oil production wellhead device |
| CN113134585A (en) * | 2021-04-20 | 2021-07-20 | 东北大学 | Homogenization square billet continuous casting production method under action of outfield cooperative control |
Non-Patent Citations (2)
| Title |
|---|
| 张怀军;韩春鹏;钱静秋;: "末端电磁搅拌对Φ390 mm铸坯内部质量的影响研究", 包钢科技, vol. 44, no. 02, pages 1 - 4 * |
| 韩春鹏，张怀军，钱静秋: "Φ270 mm 圆坯末端电磁搅拌工艺的研究", 包钢科技, vol. 44, no. 1, pages 28 - 30 * |
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