CN114908213A - Method for treating Al in steel by using rare earth cerium element 2 O 3 Method for modifying inclusions - Google Patents
Method for treating Al in steel by using rare earth cerium element 2 O 3 Method for modifying inclusions Download PDFInfo
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- CN114908213A CN114908213A CN202210691434.5A CN202210691434A CN114908213A CN 114908213 A CN114908213 A CN 114908213A CN 202210691434 A CN202210691434 A CN 202210691434A CN 114908213 A CN114908213 A CN 114908213A
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- Prior art keywords
- steel
- inclusions
- treating
- rare earth
- modifying
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 38
- 239000010959 steel Substances 0.000 title claims abstract description 38
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 15
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 15
- 229910052684 Cerium Inorganic materials 0.000 title claims abstract description 10
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 title claims abstract description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 18
- 239000011575 calcium Substances 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 13
- 229910000640 Fe alloy Inorganic materials 0.000 claims abstract description 4
- GSVIBLVMWGSPRZ-UHFFFAOYSA-N cerium iron Chemical compound [Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Fe].[Ce].[Ce] GSVIBLVMWGSPRZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000004048 modification Effects 0.000 claims abstract description 4
- 238000012986 modification Methods 0.000 claims abstract description 4
- 238000007664 blowing Methods 0.000 claims description 19
- 238000007670 refining Methods 0.000 claims description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000004925 denaturation Methods 0.000 abstract description 4
- 230000036425 denaturation Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012496 blank sample Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000002893 slag 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
-
- 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)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for utilizing rare earth cerium element to treat Al in steel 2 O 3 A method of inclusion denaturation treatment comprising: after the refined calcium treatment operation is finished, adding 30% cerium-iron alloy, and controlling the adding amount to be 1.5-2.0 kg/t. The invention aims to provide a method for utilizing rare earth cerium element to treat Al in steel 2 O 3 The method for modifying inclusion solves the problem of Al in steel caused by insufficient calcium treatment process 2 O 3 The modification of the inclusions is insufficient.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for treating Al in steel by utilizing rare earth cerium 2 O 3 A method for modifying inclusions.
Background
Alumina in steelThere are various methods for modifying the inclusions. Among them, the most well-studied and widely used technique for the denaturation treatment of inclusions is the calcium treatment of aluminum killed steel. The calcium treatment can reduce the brittleness of Al in steel 2 O 3 The inclusions are converted into low-melting point composite oxides, which contributes to a reduction in the total amount of brittle inclusions. However, calcium treatment has some problems:
although this method can greatly reduce the amount of alumina inclusions in the steel, CaO & Al are formed 2 O 3 The inclusions are not easily deformed and form micro-cracks during rolling, resulting in deterioration of the properties of the steel. The steel grade with strict requirements for fatigue properties cannot be treated with calcium in production.
② the boiling point of calcium is lower than the temperature of molten steel, the solubility of calcium in molten steel is very small
The calcium treatment process requires high-cost ladle refractory materials, an expensive ladle flue gas collection system, a new covering slag system and the like.
Therefore, in view of the insufficiency of the calcium treatment process, it is necessary to provide a method for improving the calcium treatment process for Al in steel 2 O 3 Fully denaturalizing the inclusions.
Disclosure of Invention
The invention aims to provide a method for utilizing rare earth cerium element to treat Al in steel 2 O 3 The method for modifying inclusion solves the problem of Al in steel caused by insufficient calcium treatment process in the background technology 2 O 3 The modification of inclusions is insufficient.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention relates to a method for utilizing rare earth cerium element to treat Al in steel 2 O 3 The inclusion denaturation treatment method comprises the steps of adding 30% cerium-iron alloy after the operation of refining calcium is finished, and controlling the adding amount to be 1.5-2.0 kg/t.
Furthermore, the adding mode is that the alloy is thrown at a refining sampling station.
Further, after the rare earth alloy is added, the refining soft blowing process is started.
Further, argon flow control during soft blowing0.015-0.025Nm 3 T.min; the soft blowing time t is less than or equal to 8 min; and finishing the refining process after soft blowing for 6-10 minutes, and carrying out steel feeding and pouring.
Further, the argon flow rate at the time of soft blowing was controlled to 0.02Nm 3 /t·min。
Further, after 8 minutes of soft blowing, the refining process is finished and steel feeding and pouring are carried out.
Compared with the prior art, the invention has the beneficial technical effects that:
after the method is adopted, after rare earth cerium is used for carrying out rare earth treatment on the molten steel, the proportion of B-type inclusions in the steel is increased from 90% to 96.2% when the size of the B-type inclusions is smaller than 10 mu m, from 62% to 78% when the size of the B-type inclusions is smaller than 5 mu m, and the application effect is obvious.
Detailed Description
So that the manner in which the above recited aspects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
Method for utilizing rare earth cerium element to treat Al in steel 2 O 3 A method of inclusion denaturation treatment comprising: after the refined calcium treatment operation is finished, adding 30% cerium-iron alloy, and controlling the adding amount to be 1.5-2.0 kg/t. The adding mode is that the alloy is thrown at a refining sampling station. After the rare earth alloy is added, the refining soft blowing process is started. Argon flow control at soft blowing 0.02Nm 3 T.min; the soft blowing time t is less than or equal to 8 min. Finishing the refining process after the soft blowing time is 8 minutes, and carrying out steel feeding and pouring.
The invention is carried out under the following production process: 120t converter-LF external refining-150X 150mm cross section 8 flow small square billet continuous casting machine. The test group and the blank comparison group select the same steel grade and production process equipment to respectively carry out 5-furnace production tests. The test scheme is that a blank group is refined according to the original production process to carry out calcium treatment production, soft blowing operation is carried out after the calcium treatment operation is finished, molten steel is subjected to continuous casting production after the soft blowing operation is finished, meanwhile, casting blanks are sampled at random positions, and 2 casting blanks are sampled in each furnace; the experimental group is produced according to a patent method, 20kg of rare earth alloy with the content of 30% is put in after the operation of refining calcium is finished, soft blowing operation is carried out, molten steel is continuously cast and produced after the soft blowing is finished, meanwhile, casting blanks are sampled at random positions, and 2 casting blanks are sampled in each furnace. 20 cast blank samples in two groups of experiments are analyzed by a scanning electron microscope, the sizes and the quantities of inclusions are analyzed and checked by sample spotting, and the test data are summarized as shown in the following table:
TABLE 1 blank group Al 2 O 3 Situation of inclusion
| Size of inclusions (. mu.m) | 0-10 | 10-20 | 20-50 | 50-100 | >100 | Total amount of inclusions | Ratio of less than 10 μm |
| Blank group 1-1 | 24 | 1 | 1 | 1 | 0 | 27 | 88.89％ |
| Blanks 1-2 | 30 | 3 | 1 | 0 | 0 | 34 | 88.24％ |
| Blank group 2-1 | 58 | 3 | 0 | 0 | 0 | 61 | 95.08％ |
| Blank group 2-2 | 50 | 3 | 1 | 1 | 0 | 55 | 90.91％ |
| Blank group 3-1 | 68 | 11 | 0 | 0 | 0 | 79 | 86.08％ |
| Blank group 3-2 | 111 | 9 | 0 | 0 | 0 | 120 | 92.50％ |
| Blank group 4-1 | 62 | 18 | 1 | 0 | 0 | 81 | 76.54％ |
| Blank group 4-2 | 36 | 5 | 1 | 1 | 0 | 43 | 83.72％ |
| Blank group 5-1 | 42 | 7 | 1 | 2 | 0 | 52 | 80.77％ |
| Blank group 5-2 | 59 | 4 | 1 | 1 | 1 | 66 | 89.39％ |
| Mean value of | 54 | 6 | 1 | 1 | 0 | 62 | 87.21％ |
According to the sampling analysis, Al in the steel samples produced in the blank group 2 O 3 The total amount of the inclusions is 62 on average, wherein the proportion of the inclusions smaller than 10 μm accounts for 87.21%, and the proportion of the inclusions larger than 10 μm accounts for 9.68%.
TABLE 2 blank group Al 2 O 3 Situation of inclusion
According to the sampling analysis, the experimental group produces steel grade with Al 2 O 3 The total amount of the inclusions is 47 on average, wherein the proportion of the inclusions smaller than 10 μm accounts for 95.97%, and the proportion of the inclusions larger than 10 μm accounts for 2.13%.
The comparison of two groups of test data shows that Al in steel is obviously reduced after the steel is used 2 O 3 The total number of the inclusions is obviously reduced from 62 on average to 47 on average, and the reduction amplitude is 31.91%; the proportion of the inclusions smaller than 10 mu m is increased from 87.21% to 95.97%, and the amplification is 8.76%. Patented method for improving Al in steel 2 O 3 The total amount and size of the inclusions are obviously influenced.
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 (6)
1. Method for utilizing rare earth cerium element to treat Al in steel 2 O 3 The method for modifying inclusion is characterized in that 30 percent cerium-iron alloy is added after the operation of refining calcium is finished, and the adding amount is controlled to be 1.5-2.0 kg/t.
2. The method of claim 1 for treating Al in steel with Ce 2 O 3 The method for modifying the inclusions is characterized in that the adding mode is adding alloy by throwing at a refining sampling station.
3. The method of claim 1 for treating Al in steel with Ce 2 O 3 The method for modifying inclusion is characterized in that after the rare earth alloy is added, the refining soft blowing process is started.
4. The method of claim 3 for treating Al in steel with Ce 2 O 3 The method for modifying the inclusions is characterized in that the argon flow rate is controlled to 0.015 to 0.025Nm during soft blowing 3 T.min; the soft blowing time t is less than or equal to 8 min; and finishing the refining process after soft blowing for 6-10 minutes, and carrying out steel feeding and pouring.
5. The method of claim 4 for treating Al in steel with Ce 2 O 3 The method for the modification treatment of inclusions is characterized in that the argon flow rate is controlled to 0.02Nm at the time of soft blowing 3 /t·min。
6. The method of claim 4 for treating Al in steel with Ce 2 O 3 Method for modifying inclusions, and the sameIs characterized in that the refining process is finished after the soft blowing is carried out for 8 minutes, and the steel feeding and the pouring are carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210691434.5A CN114908213A (en) | 2022-06-17 | 2022-06-17 | Method for treating Al in steel by using rare earth cerium element 2 O 3 Method for modifying inclusions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210691434.5A CN114908213A (en) | 2022-06-17 | 2022-06-17 | Method for treating Al in steel by using rare earth cerium element 2 O 3 Method for modifying inclusions |
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| Publication Number | Publication Date |
|---|---|
| CN114908213A true CN114908213A (en) | 2022-08-16 |
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| CN202210691434.5A Pending CN114908213A (en) | 2022-06-17 | 2022-06-17 | Method for treating Al in steel by using rare earth cerium element 2 O 3 Method for modifying inclusions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116287563A (en) * | 2023-03-22 | 2023-06-23 | 包头钢铁（集团）有限责任公司 | Method for purifying sulfur element in steel by utilizing rare earth cerium-iron alloy |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111560493A (en) * | 2020-05-12 | 2020-08-21 | 包头钢铁（集团）有限责任公司 | Control method for modified heavy rail steel composite inclusions |
| CN113416813A (en) * | 2021-05-14 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Method for controlling addition of rare earth alloy of rare earth structural steel |
| CN114058767A (en) * | 2021-11-15 | 2022-02-18 | 东北大学 | Method for refining rare earth inclusions in super stainless steel |
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- 2022-06-17 CN CN202210691434.5A patent/CN114908213A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111560493A (en) * | 2020-05-12 | 2020-08-21 | 包头钢铁（集团）有限责任公司 | Control method for modified heavy rail steel composite inclusions |
| CN113416813A (en) * | 2021-05-14 | 2021-09-21 | 包头钢铁（集团）有限责任公司 | Method for controlling addition of rare earth alloy of rare earth structural steel |
| CN114058767A (en) * | 2021-11-15 | 2022-02-18 | 东北大学 | Method for refining rare earth inclusions in super stainless steel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116287563A (en) * | 2023-03-22 | 2023-06-23 | 包头钢铁（集团）有限责任公司 | Method for purifying sulfur element in steel by utilizing rare earth cerium-iron alloy |
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Application publication date: 20220816 |