CN114959175A - Method for smelting acid-soluble aluminum and nitrogen narrow components in Hi-B steel - Google Patents
Method for smelting acid-soluble aluminum and nitrogen narrow components in Hi-B steel Download PDFInfo
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- CN114959175A CN114959175A CN202210661619.1A CN202210661619A CN114959175A CN 114959175 A CN114959175 A CN 114959175A CN 202210661619 A CN202210661619 A CN 202210661619A CN 114959175 A CN114959175 A CN 114959175A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 49
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 18
- 238000003723 Smelting Methods 0.000 title claims abstract description 9
- 238000007670 refining Methods 0.000 claims abstract description 19
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 19
- 239000000956 alloy Substances 0.000 claims description 19
- 238000010079 rubber tapping Methods 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 9
- 238000005275 alloying Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229910001337 iron nitride Inorganic materials 0.000 claims description 5
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000010923 batch production Methods 0.000 abstract description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 8
- 239000003112 inhibitor Substances 0.000 description 6
- 238000001953 recrystallisation Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000005121 nitriding Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for smelting acid-soluble aluminum and narrow nitrogen components in Hi-B steel, which meets the requirement that Al s and nitrogen which are important elements of H i-B steel meet the control of the narrow components by designing key process parameters and control know-how of the working procedures of a converter, a refining RH and a continuous casting machine, and realizes the stable batch production.
Description
Technical Field
The invention relates to a method for smelting acid-soluble aluminum and narrow nitrogen components in Hi-B steel.
Background
The oriented silicon steel is divided into common oriented silicon steel (CGO) and high magnetic induction oriented silicon steel (Hi-B steel), which are indispensable soft magnetic materials in the electronic power and military industry, and particularly, the Hi-B steel is complex in production process, strict in component control and low in impurity content, so that the oriented silicon steel is called as an artwork in steel materials. The high-magnetic-induction oriented silicon steel needs low iron loss and high magnetic induction, the Gaussian texture {110} <001> has great effect, the Hi-B steel requires that B8 is 1.90-1.95T, the orientation degree is greater than 95%, and the average deviation angle of <001> is about 3 degrees. The Gauss texture with high orientation degree needs to be formed in the secondary recrystallization process, the secondary recrystallization process is an abnormal or discontinuous grain growth process, an inhibitor (metastable second phase precipitated particles) is needed to inhibit the growth of primary recrystallization grains, the inhibition force of the second phase grains is weakened along with the increase of the annealing temperature, so that the grains with the Gauss orientation are abnormally grown to phagocytose surrounding small grains, and finally, the grains with the Gauss orientation occupy the whole space.
The main inhibitor in the acquired inhibitor Hi-B steel is AlN, and the inhibitor is formed by N and Als in the steel through nitriding treatment after decarburization annealing. Therefore, a suitable content of Als (range of 25ppm) and a suitable content of nitrogen (range of 15ppm) in the Hi-B steel are required. Too high an Als content, poor quality of the bottom layer and too high a nitrogen content, which causes the appearance of peeling and bubble defects. The content of Als and nitrogen is too low, the quantity of fine AlN precipitated after normalization is insufficient, and secondary recrystallization is incomplete. By controlling the accurate content of Als and nitrogen in the smelting process, the precipitation size and distribution of AlN meet the requirements in the production process, and secondary recrystallization growth in the Gaussian position direction is realized.
Currently, application No. 201310370458.1 discloses a method for controlling the AlN inhibitor content in oriented silicon steel. According to the invention, silicon-manganese nitride alloy is added in the converter tapping process, the nitrogen content is controlled by RH nitrogen circulation, Al particles are added to adjust the Als content, and the mass content ratio of Als to N in refined molten steel is controlled to be 1.90-2.10. The method is tried out from common oriented silicon steel, the content of Als is low, the control precision of Als and N is not described, and the control procedure is only RH off-position.
Application No. 201510869510.7 discloses a method of smelting oriented silicon steel alloyed in an RH furnace. The method comprises the steps of adding aluminum balls and bauxite into RH refining for cyclic decarburization for 3-5 min for deoxidation and slagging, and then performing recycling for 2-3 min after the aluminum balls and bauxite are added, and then performing alloying. The method introduces an alloying method and increases processing time and cost at RH deoxidation, and does not introduce control measures for Als and nitrogen.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a method for controlling narrow component ranges of Als and nitrogen in a main inhibitor of Hi-B steel in a converter, a refining RH and a casting machine process, and the obtained high-precision ranges of Als and nitrogen enable the process stability of the post-process and the magnetic property stability of a finished product to be improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a method for smelting acid-soluble aluminum and narrow nitrogen components in Hi-B steel, which comprises the following steps:
a converter process: nitrogen is used in the whole process of bottom blowing of the converter, the tapping temperature is controlled to be 1620-1650 ℃, aluminum particles and ferrosilicon alloy are added in the tapping process for alloying, the whole process of tapping uses slag stopping operation, CaO and a modifying agent are added in the last stage of tapping, and the slag thickness is controlled to be 50-100 mm;
a refining procedure: vacuumizing to refine the ladle at the in-place temperature of 1620-1630 ℃, wherein the nitrogen circulation flow is controlled to be 150-200 Nm in the treatment process 3 The first batch of silicon iron nitride alloy is added circularly, and the mass ratio of the alloy to the molten steel is controlled to be 1.0-1.5 kg/t; sampling and detecting the content of Als and nitrogen after circulating for 5-8 min, adding aluminum particles for three times according to the component conditions for alloying, controlling the mass ratio of the alloy to the molten steel to be 0.3-0.5 kg/t, and controlling the content of refining dislocated Als to exceed the internal control upper limit to be 0-0.002%; when circulating for 20-25 min, adding a second batch of ferrosilicon nitride alloy according to the detection result, controlling the mass ratio of the alloy to the molten steel to be 0.5-0.8 kg/t, and controlling the refining off-site nitrogen content to be 0-0.0003% of a target; controlling the refining dislocation temperature to 1510-1530 ℃;
and (3) continuous casting process: the inspection and sealing of the ladle long nozzle and the connection part are well done in the aspect of protection casting, the protection air flow is required to ensure that the argon hose cannot leak air on the basis of no turning over of the liquid level, and the middle ladle covering agent and the crystallizer protection slag are uniformly covered; during the casting process, the aluminum loss is guaranteed to be 0.002-0.003%, and the nitrogen increase is controlled to be 0.0003-0.0005%.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention meets the requirement that the important elements Als and nitrogen of the Hi-B steel meet the narrow composition control by designing key process parameters and control know-how of the working procedures of a converter, a refining RH and a continuous casting machine, and realizes the stable batch production.
Detailed Description
A method for smelting acid-soluble aluminum and nitrogen narrow components in Hi-B steel comprises the following steps:
a converter process: nitrogen is used in the whole process of bottom blowing of the converter, the tapping temperature is controlled to be 1620-1650 ℃, aluminum particles and ferrosilicon alloy are added in the tapping process for alloying, the whole process of tapping uses slag stopping operation, CaO and a modifying agent are added in the last stage of tapping, and the slag thickness is controlled to be 50-100 mm;
a refining procedure: vacuumizing to refine the ladle at the in-place temperature of 1620-1630 ℃, wherein the nitrogen circulation flow is controlled to be 150-200 Nm in the treatment process 3 The first batch of silicon iron nitride alloy is added circularly, and the mass ratio of the alloy to the molten steel is controlled to be 1.0-1.5 kg/t; sampling and detecting the content of Als and nitrogen after circulating for 5-8 min, adding aluminum particles for three times according to the component conditions for alloying, controlling the mass ratio of the alloy to the molten steel to be 0.3-0.5 kg/t, and controlling the content of refining dislocated Als to exceed the internal control upper limit to be 0-0.002%; when the circulation is carried out for 20-25 min, adding a second batch of silicon-iron nitride alloy according to the detection result, controlling the mass ratio of the alloy to the molten steel to be 0.5-0.8 kg/t, and controlling the refining off-site nitrogen content to be 0-0.0003% of a target; the refining off-position temperature is controlled to be 1510-1530 ℃;
and (3) continuous casting process: the inspection and sealing of the ladle long nozzle and the connection part are well done in the aspect of protection casting, the protection air flow is required to ensure that the argon hose cannot leak air on the basis of no turning over of the liquid level, and the middle ladle covering agent and the crystallizer protection slag are uniformly covered; during the casting process, the aluminum loss is guaranteed to be 0.002-0.003%, and the nitrogen increase is controlled to be 0.0003-0.0005%.
The present invention will be described in further detail with reference to specific examples.
Examples 1 to 5 are specific conditions of the requirements of the present invention, the chemical compositions are shown in tables 1 and 2, and the nitriding amount and the magnetic properties after the nicking are shown in table 3.
Table 1 Als site composition units: is based on
| Examples | Refining in place | Off-position for refining | Middle ladle |
| 1 | 0.0097 | 0.0310 | 0.0295 |
| 2 | 0.0095 | 0.0315 | 0.0292 |
| 3 | 0.0120 | 0.0311 | 0.0290 |
| 4 | 0.0112 | 0.0312 | 0.0298 |
| 5 | 0.0098 | 0.0305 | 0.0288 |
Table 2 nitrogen site composition units: is based on
| Examples | Refining in place | Off-position for refining | Middle ladle |
| 1 | 0.0032 | 0.0062 | 0.0067 |
| 2 | 0.0025 | 0.0065 | 0.0070 |
| 3 | 0.0042 | 0.0060 | 0.0064 |
| 4 | 0.0030 | 0.0066 | 0.0069 |
| 5 | 0.0040 | 0.0060 | 0.0065 |
TABLE 3 amount of nitriding and finished product Properties
| Examples | Amount of nitriding ppm | P1.7/50(W/kg) | B800(T) |
| 1 | 225 | 0.910 | 1.930 |
| 2 | 240 | 0.912 | 1.942 |
| 3 | 232 | 0.920 | 1.945 |
| 4 | 225 | 0.910 | 1.932 |
| 5 | 242 | 0.890 | 1.915 |
From the above table, it can be seen that: the invention can stably control the important elements Als and nitrogen element of the Hi-B steel, solves the technical difficulty in production, realizes stable production on the premise of ensuring good magnetic property, and has good application prospect.
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 (1)
1. A method for smelting acid-soluble aluminum and narrow nitrogen components in Hi-B steel is characterized by comprising the following steps: the method comprises the following steps:
a converter process: nitrogen is used in the whole process of bottom blowing of the converter, the tapping temperature is controlled to be 1620-1650 ℃, aluminum particles and ferrosilicon alloy are added in the tapping process for alloying, the whole process of tapping uses slag stopping operation, CaO and a modifying agent are added in the last stage of tapping, and the slag thickness is controlled to be 50-100 mm;
a refining procedure: vacuumizing to refine the ladle at the in-place temperature of 1620-1630 ℃, wherein the nitrogen circulation flow is controlled to be 150-200 Nm in the treatment process 3 The first batch of silicon iron nitride alloy is added circularly, and the mass ratio of the alloy to the molten steel is controlled to be 1.0-1.5 kg/t; sampling and detecting the content of Als and nitrogen after circulating for 5-8 min, adding aluminum particles for three times according to the component conditions for alloying, controlling the mass ratio of the alloy to the molten steel to be 0.3-0.5 kg/t, and controlling the content of the refined off-site Als to be over-internal controlThe limit is 0-0.002%; when the circulation is carried out for 20-25 min, adding a second batch of silicon-iron nitride alloy according to the detection result, controlling the mass ratio of the alloy to the molten steel to be 0.5-0.8 kg/t, and controlling the refining off-site nitrogen content to be 0-0.0003% of a target; controlling the refining dislocation temperature to 1510-1530 ℃;
and (3) continuous casting process: the inspection and sealing of the ladle long nozzle and the connection part are well done in the aspect of protection casting, the protection air flow is required to ensure that the argon hose cannot leak air on the basis of no turning over of the liquid level, and the middle ladle covering agent and the crystallizer protection slag are uniformly covered; during the casting process, the aluminum loss is guaranteed to be 0.002-0.003%, and the nitrogen increase is controlled to be 0.0003-0.0005%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210661619.1A CN114959175B (en) | 2022-06-13 | 2022-06-13 | Method for smelting narrow components of acid-soluble aluminum and nitrogen in Hi-B steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210661619.1A CN114959175B (en) | 2022-06-13 | 2022-06-13 | Method for smelting narrow components of acid-soluble aluminum and nitrogen in Hi-B steel |
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| Publication Number | Publication Date |
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| CN114959175A true CN114959175A (en) | 2022-08-30 |
| CN114959175B CN114959175B (en) | 2024-03-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558837A (en) * | 2022-09-15 | 2023-01-03 | 安阳钢铁股份有限公司 | Method for accurately controlling content of acid-soluble aluminum in common oriented silicon steel CGO smelting process |
| CN117701829A (en) * | 2024-02-06 | 2024-03-15 | 包头市威丰稀土电磁材料股份有限公司 | Nitrogen control method for oriented silicon steel |
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| CN103952511A (en) * | 2014-04-03 | 2014-07-30 | 商洛学院 | Method for controlling nitrogen content of high-strength steel molten steel |
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| CN114107639A (en) * | 2021-11-25 | 2022-03-01 | 包头钢铁（集团）有限责任公司 | Preparation method of common-grade rare earth oriented silicon steel |
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2022
- 2022-06-13 CN CN202210661619.1A patent/CN114959175B/en active Active
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| WO2013143022A1 (en) * | 2012-03-26 | 2013-10-03 | 宝山钢铁股份有限公司 | Unoriented silicon steel and method for manufacturing same |
| CN103952511A (en) * | 2014-04-03 | 2014-07-30 | 商洛学院 | Method for controlling nitrogen content of high-strength steel molten steel |
| CN110453029A (en) * | 2019-09-25 | 2019-11-15 | 敬业钢铁有限公司 | The method of the inexpensive accurate control siliceous low-alloy steel nitrogen content of high nitrogen |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115558837A (en) * | 2022-09-15 | 2023-01-03 | 安阳钢铁股份有限公司 | Method for accurately controlling content of acid-soluble aluminum in common oriented silicon steel CGO smelting process |
| CN117701829A (en) * | 2024-02-06 | 2024-03-15 | 包头市威丰稀土电磁材料股份有限公司 | Nitrogen control method for oriented silicon steel |
| CN117701829B (en) * | 2024-02-06 | 2024-04-26 | 包头市威丰稀土电磁材料股份有限公司 | Nitrogen control method for oriented silicon steel |
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