CN116511436A - Device and method for alloying molten steel of smelting rare earth steel tundish - Google Patents
Device and method for alloying molten steel of smelting rare earth steel tundish Download PDFInfo
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- CN116511436A CN116511436A CN202310186101.1A CN202310186101A CN116511436A CN 116511436 A CN116511436 A CN 116511436A CN 202310186101 A CN202310186101 A CN 202310186101A CN 116511436 A CN116511436 A CN 116511436A
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- rare earth
- steel
- tundish
- material conveying
- conveying pipeline
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- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 126
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 112
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 89
- 239000010959 steel Substances 0.000 title claims abstract description 89
- 238000005275 alloying Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003723 Smelting Methods 0.000 title claims abstract description 16
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 53
- 239000000956 alloy Substances 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000011261 inert gas Substances 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims abstract description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 239000011593 sulfur Substances 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 230000004907 flux Effects 0.000 claims description 6
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 9
- 229910000640 Fe alloy Inorganic materials 0.000 description 4
- 230000024121 nodulation Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 rare earth aluminate Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- B22D11/108—Feeding additives, powders, or the like
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
-
- 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
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
- C21C2007/0062—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires with introduction of alloying or treating agents under a compacted form different from a wire, e.g. briquette, pellet
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The invention provides a device and a method for alloying molten steel in a tundish for smelting rare earth steel. The device comprises a material conveying pipeline for adding alloy for alloying; the material conveying pipeline adopts inert gas to carry out atmosphere protection, and one end of the material conveying pipeline directly goes deep into the interior of the tundish molten pool and is not contacted with the tundish surface covering agent; the pipeline bracket is used for supporting the material conveying pipeline and is arranged at one side of the molten steel tank; and a gas supply device for supplying inert gas. The invention also discloses a smelting method of the device, which comprises the steps of firstly roasting and preheating a material conveying pipeline; then one end of the material conveying pipeline extends below the liquid level of the tundish molten pool; and starting the gas supply device, keeping the inert gas continuously introduced for a certain time, and adding the rare earth alloy into the molten steel of the tundish at a certain feeding speed by adopting the feeder until the smelting of the rare earth steel is completed. The rare earth steel alloying is carried out by adopting the invention, the casting process has good castability, and the rare earth element yield can reach more than 50 percent.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a device and a method for alloying molten steel in a tundish for smelting rare earth steel.
Background
The rare earth steel has stronger corrosion resistance and better machining performance, and the production yield of the rare earth steel produced by adopting the traditional die casting process is small in scale, and the production cost is high, so that the market demand is difficult to meet.
In the existing process, rare earth elements are extremely active in the process of producing rare earth steel by adopting a continuous casting process, and are easy to chemically react with free oxygen, sulfur and various oxides in the steel, so that substances such as rare earth aluminate, rare earth oxide and the like are formed to form nodulation substances at the water gap of a molten steel tank and near the long water gap, and the smooth casting process is affected. And various rare earth compounds formed lead to extremely low rare earth element yield in the rare earth steel, and generally, the rare earth yield is difficult to exceed 20 percent when the rare earth steel is produced.
The rare earth alloy adding mode is a key process affecting the yield of the rare earth alloy and affecting the casting process, so that the invention is highly needed to invent a device and a method capable of guaranteeing the yield of the rare earth alloy and effectively controlling the problem of nozzle nodulation in the casting process of rare earth steel.
Disclosure of Invention
According to the technical problems of nozzle nodulation and low rare earth metal yield in the rare earth steel continuous casting process, the device and the method for alloying molten steel in a tundish for smelting rare earth steel are provided. The invention mainly utilizes the arrangement of the material conveying pipeline to directly send the rare earth alloy into the molten pool of the tundish, and the rare earth alloy is not contacted with air or the surface covering agent of the tundish, thereby playing the role of good casting property of the continuous casting process and the yield of rare earth elements reaching more than 50 percent in the process of alloying the rare earth steel.
The invention adopts the following technical means:
a device for alloying molten steel in a tundish for smelting rare earth steel, which is characterized by comprising:
the material conveying pipeline is used for adding alloy for alloying; the material conveying pipeline adopts inert gas to be introduced for atmosphere protection, and one end of the material conveying pipeline directly penetrates into the tundish molten pool and is not contacted with the tundish surface covering agent;
the pipeline bracket is arranged on one side of the molten steel tank and is used for supporting the material conveying pipeline;
and the gas supply device is used for supplying inert gas.
Further, the material conveying pipeline is made of aluminum-carbon refractory materials.
Further, the inert gas is commercially pure argon.
The invention also provides a method for alloying molten steel in the rare earth steel tundish by adopting the device, which is characterized by comprising the following steps:
s1, before use, baking and preheating the material conveying pipeline;
s2, extending one end of the material conveying pipeline below the liquid level of a tundish molten pool;
s3, starting the gas supply device, keeping the continuous introduction of inert gas, and adding rare earth alloy into molten steel of the tundish by adopting a feeder at a certain adding rate after ensuring a certain inert gas introduction time until the smelting of the rare earth steel is completed.
Further, in step S3, before the rare earth alloy is added, the inert gas is kept to be introduced for 3 to 5 minutes.
Further, in step S3, the adding rate of the rare earth alloy is matched with the steel flux, and the following relationship is satisfied:
wherein Q is the steel flux of the continuous casting machine, and t/min; q (Q) a The alloy addition rate is kg/min; omega is the target value of the rare earth content in the produced rare earth steel, and wt.%; omega a Is the content of rare earth elements in the alloy, wt.%; r is the acceptance rate of the rare earth alloy,%.
Further, in step S3, the rare earth content in the rare earth alloy is 10wt.% to 50wt.%.
Further, in the step S3, the rare earth alloy has a checked yield of 40% -60%.
Further, in step S3, the rare earth alloy is a rare earth cored wire or a block with uniform granularity.
Further, in step S3, before alloying, the molten steel has a free oxygen content of less than 0.001wt.%, a sulfur content of less than 0.0016wt.%, and a total aluminum content of less than 0.03wt.%.
Compared with the prior art, the invention adopts a material conveying pipeline mode, and the rare earth alloy is added into the molten steel of the tundish according to the preset content and the adding rate, so that the rare earth oxidation in the adding process can be effectively avoided; meanwhile, by controlling the adding rate and the rare earth content and matching with the oxygen, sulfur and aluminum content in molten steel, the rare earth steel alloying is realized, the castability of the continuous casting process is good, and the rare earth element yield can reach more than 50%.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 shows an apparatus for alloying molten steel in a tundish for smelting rare earth steel according to the present invention.
In the figure: 1. a material conveying pipeline; 2. a tundish; 3. a covering agent; 4. molten steel; 5. a pipeline bracket.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in FIG. 1, the invention provides a device for alloying molten steel in a tundish for smelting rare earth steel, which specifically comprises:
a material conveying pipeline 1 for adding alloy for alloying; the material conveying pipeline 1 adopts inert gas to be introduced for atmosphere protection, and one end of the material conveying pipeline directly penetrates into the molten pool of the tundish 2 and is not contacted with the surface covering agent 3 of the tundish; the material conveying pipeline 1 is made of aluminum-carbon refractory materials.
The pipeline bracket 5 is arranged on one side of the molten steel tank and is used for supporting the material conveying pipeline 1;
and the gas supply device is used for providing inert gas, and the inert gas is industrial pure argon.
The invention also provides a method for alloying molten steel in the rare earth steel tundish by using the device, which comprises the following steps:
s1, before use, baking and preheating the material conveying pipeline 1;
s2, extending one end of the material conveying pipeline 1 below the liquid level of a molten pool of the tundish 2;
s3, starting the gas supply device, keeping the continuous introduction of inert gas, keeping the introduction time of inert gas at 3-5 min after ensuring a certain introduction time of inert gas, and adding rare earth alloy into the molten steel 4 of the tundish at a certain adding rate by adopting a feeder until the smelting of rare earth steel is completed.
The rare earth alloy addition rate is matched with the steel flux, and the following relation is satisfied:
wherein Q is the steel flux of the continuous casting machine, and t/min; q (Q) a The alloy addition rate is kg/min; omega is the target value of the rare earth content in the produced rare earth steel, and wt.%; omega a Is the content of rare earth elements in the alloy, wt.%; r is the acceptance rate of the rare earth alloy,%.
The rare earth content in the rare earth alloy is 10wt.% to 50wt.%.
The acceptance rate of the rare earth alloy is 40-60%.
The rare earth alloy is a rare earth cored wire or a block with uniform granularity.
Before alloying, the free oxygen content in the molten steel is lower than 0.001 wt%, the sulfur content is lower than 0.0016 wt%, and the total aluminum content is lower than 0.03 wt%.
Example 1
The total molten steel amount is 206t, rare earth alloy is selected as rare earth iron alloy with the rare earth metal content of 38.8 wt%, and the main components of the molten steel 4 before rare earth alloying are as follows: 0.0009wt.% free oxygen, 0.0013wt.% sulfur, and 0.019wt.% total aluminum in the molten steel 4;
step 1: before use, the material conveying pipeline 1 is baked and preheated;
step 2: one end of the material conveying pipeline 1 extends below the liquid level of a molten pool of the tundish 2;
step 3: starting the gas supply device, and keeping the inert gas continuously introduced; after inert gas is introduced for 3min, the steel-introducing amount of the casting machine is 7.17t/min, the target rare earth content of the rare earth steel is 150ppm, the empirical yield is calculated according to 60%, the alloy adding rate is 4.62kg/min, and the rare earth alloy is added into the tundish 2 at the adding rate of 4.62kg/min by adopting a feeder;
after the rare earth alloying process is completed, the content of rare earth elements in the molten steel 4 is detected to be 169ppm, the total addition amount of the rare earth alloy is 132kg, and the rare earth metal yield is 63.6%.
Example 2
The total amount of molten steel is 205t, rare earth alloy is selected as rare earth iron alloy with the rare earth metal content of 21 wt%, and the main components of molten steel 4 before rare earth alloying are: 0.0009wt.% free oxygen, 0.0014wt.% sulfur, and 0.018wt.% total aluminum in molten steel 4;
unlike step 3 in example 1, the inert gas was introduced for 3 minutes, the casting machine was introduced with a steel amount of 7.8t/min, the rare earth content of the rare earth steel target was 100ppm, the empirical yield was calculated as 50%, the alloy addition rate was 7.42kg/min, and the rare earth alloy was added into the tundish 2 at a feed rate of 7.42kg/min using a feeder;
after the rare earth alloying process is completed, the content of rare earth elements in the molten steel 4 is detected to be 104ppm, the total addition amount of the rare earth alloy is 195kg, and the rare earth metal yield is 52%.
Example 3
The total molten steel amount is 208t, rare earth alloy is selected as rare earth iron alloy with the rare earth metal content of 19 wt%, and the main components of the molten steel 4 before rare earth alloying are as follows: 0.0008wt.% free oxygen, 0.0012wt.% sulfur, and 0.0205wt.% total aluminum in molten steel 4;
unlike step 3 of example 1, after inert gas is introduced for 5 minutes, the steel-introducing amount of the casting machine is 6.4t/min, the target rare earth content of the rare earth steel is 150ppm, the empirical yield is calculated according to 55%, the alloy addition rate is 9.18kg/min, and the rare earth alloy is added into the tundish 2 at the addition rate of 9.18kg/min by adopting a feeder;
after the rare earth alloying process is completed, the content of rare earth elements in the molten steel 4 is detected to be 152ppm, the total addition amount of the rare earth alloy is 298kg, and the rare earth metal yield is 55.7%.
Example 4
The total amount of molten steel is 201t, rare earth alloy is selected as rare earth iron alloy with 18.5wt.% of rare earth metal, and the main components of molten steel 4 before rare earth alloying are as follows: 0.0009wt.% free oxygen, 0.0015wt.% sulfur, and 0.018wt.% total aluminum in molten steel 4;
unlike step 3 of example 1, the inert gas was introduced for 4 minutes, the casting machine was introduced with a steel amount of 5.93t/min, the rare earth target rare earth content of the rare earth steel was 50ppm, the empirical yield was calculated as 55%, the alloy addition rate was 2.91kg/min, and the rare earth alloy was added into the tundish at a feed rate of 2.91kg/min using a feeder;
after the rare earth alloying process is completed, the content of rare earth elements in the molten steel 4 is detected to be 51ppm, the total addition amount of the rare earth alloy is 98.7kg, and the rare earth metal yield is 56.1%.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A device for alloying molten steel in a tundish for smelting rare earth steel, which is characterized by comprising:
the material conveying pipeline is used for adding alloy for alloying; the material conveying pipeline adopts inert gas to be introduced for atmosphere protection, and one end of the material conveying pipeline directly penetrates into the tundish molten pool and is not contacted with the tundish surface covering agent;
the pipeline bracket is arranged on one side of the molten steel tank and is used for supporting the material conveying pipeline;
and the gas supply device is used for supplying inert gas.
2. The apparatus for alloying molten steel in a tundish for smelting rare earth steel according to claim 1, wherein said material conveying pipe is made of an aluminum-carbon refractory material.
3. The apparatus for alloying molten steel in a tundish for smelting rare earth steel according to claim 1, wherein said inert gas is commercially pure argon.
4. A method of alloying molten steel in a rare earth steel tundish using an apparatus as claimed in any one of claims 1 to 3, comprising the steps of:
s1, before use, baking and preheating the material conveying pipeline;
s2, extending one end of the material conveying pipeline below the liquid level of a tundish molten pool;
s3, starting the gas supply device, keeping the continuous introduction of inert gas, and adding rare earth alloy into molten steel of the tundish by adopting a feeder at a certain adding rate after ensuring a certain inert gas introduction time until the smelting of the rare earth steel is completed.
5. The method according to claim 4, wherein in step S3, the inert gas is kept for 3 to 5 minutes before the rare earth alloy is added.
6. The method according to claim 4, wherein in step S3, the rare earth alloy addition rate is matched with the steel flux, satisfying the following relationship:
wherein Q is the steel flux of the continuous casting machine, and t/min; q (Q) a The alloy addition rate is kg/min; omega is the target value of the rare earth content in the produced rare earth steel, and wt.%; omega a Is the content of rare earth elements in the alloy, wt.%; r is the acceptance rate of the rare earth alloy,%.
7. The method according to claim 4, wherein in step S3, the rare earth content in the rare earth alloy is 10wt.% to 50wt.%.
8. The method of claim 4, wherein in step S3, the rare earth alloy is inspected to have a yield of 40% to 60%.
9. The method according to claim 4, wherein in step S3, the rare earth alloy is a rare earth cored wire or a block with uniform particle size.
10. The method of claim 4, wherein in step S3, the molten steel has a free oxygen content of less than 0.001wt.%, a sulfur content of less than 0.0016wt.%, and a total aluminum content of less than 0.03wt.% prior to alloying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310186101.1A CN116511436A (en) | 2023-03-01 | 2023-03-01 | Device and method for alloying molten steel of smelting rare earth steel tundish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310186101.1A CN116511436A (en) | 2023-03-01 | 2023-03-01 | Device and method for alloying molten steel of smelting rare earth steel tundish |
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| Publication Number | Publication Date |
|---|---|
| CN116511436A true CN116511436A (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310186101.1A Pending CN116511436A (en) | 2023-03-01 | 2023-03-01 | Device and method for alloying molten steel of smelting rare earth steel tundish |
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| Country | Link |
|---|---|
| CN (1) | CN116511436A (en) |
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2023
- 2023-03-01 CN CN202310186101.1A patent/CN116511436A/en active Pending
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