WO2017111190A1 - Dc전기로 - Google Patents
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- Publication number
- WO2017111190A1 WO2017111190A1 PCT/KR2015/014238 KR2015014238W WO2017111190A1 WO 2017111190 A1 WO2017111190 A1 WO 2017111190A1 KR 2015014238 W KR2015014238 W KR 2015014238W WO 2017111190 A1 WO2017111190 A1 WO 2017111190A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lower electrode
- case
- electric furnace
- main body
- disposed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C7/00—Stoves or ranges heated by electric energy
- F24C7/06—Arrangement or mounting of electric heating elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
- F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces heated electrically, with or without any other source of heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
- F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
- F27B3/22—Arrangements of air or gas supply devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces
- F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
- F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D11/00—Arrangement of elements for electric heating in or on furnaces
- F27D11/08—Heating by electric discharge, e.g. arc discharge
- F27D11/10—Disposition of electrodes
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- 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
Definitions
- the present invention relates to a DC electric furnace in which interference with the lower electrode does not occur and the stirring means of the molten steel is secured by disposing the lowering means at a position spaced from the refractory body of the main body and solves the stability problem.
- the electric furnace has a problem that the stirring force of the molten steel is weak compared to the converter. Due to the weak stirring force, the equilibrium value of [C] * [O] is high, and the end point oxygen is high, and the T-Fe in the slag is high, which causes a problem of lowering the error rate.
- the high end point oxygen and high T.Fe in the slag increases the raw unit of Al added to the deoxidizer and acted as the main cause of the quality defect increase and the cost increase due to the Al 2 O 3 inclusions generated during the deoxidation process.
- An object of the present invention is to provide a DC electric furnace which does not interfere with the lower electrode and secures the stirring force of the molten steel by disposing the lowering means at a position separated from the refractory of the main body and solves the stability problem.
- a plurality of collecting means may be provided, and may be disposed at a position spaced a predetermined distance from the lower electrode.
- the collecting means may be disposed at a position of (5/8) * R to (7/8) * R from the center of the lower electrode.
- the bottom surface is divided into a tapping area on the opposite side from the tapping area where the tapping hole is formed on the basis of the center of the lower electrode, and at least one lowering means is located at a position where the first virtual line serving as a reference of the tapping area and the tapping area is placed.
- the above may be arranged.
- At least one of the lowering means may be disposed at positions spaced apart by the same distance to both sides of the second virtual line with reference to the second virtual line connecting the center of the lower electrode and the tap hole.
- the bottom surface of the main body is inclined so as to deepen from the inner wall toward the lower electrode of the center portion, and the gas blowing direction of the lower collecting means may be perpendicular to the inclined portion.
- the flow rate supplied from the deodorizing means may vary depending on the time of operation.
- due to the gas blown from the low odor means has an effect of reducing the power source unit by increasing the stirring force of the molten steel.
- due to the end point oxygen down effect has an effect that the tapping error rate is increased.
- FIG. 1 is a view showing a DC electric furnace according to an embodiment of the present invention.
- FIG. 2 is a view showing a virtual model of a DC electric furnace for the experiment.
- 3 is a view showing a virtual model of a DC electric furnace for the experiment.
- Figure 4a is a graph showing the Maximum UDS, Minimum UDS over time of each case for the experiment.
- Figure 4b is a graph showing the difference between the maximum value and the minimum value over time of each case for the experiment Delta UDS and Mix UDS.
- Figure 5 is a graph showing the absolute value and relative value over time of each case for the experiment.
- Figure 6 is a graph showing the absolute value and relative value over time of each case for the experiment.
- Figure 7 is a graph showing the absolute value and relative value over time of each case for the experiment.
- Figure 8 is a graph showing the absolute value and relative value over time of each case for the experiment.
- Figure 9 is a graph showing the absolute value and relative value over time of each case for the experiment.
- Figure 10 is a graph showing the absolute value and relative value over time of each case for the experiment.
- Figure 11 is a graph showing the absolute value and relative value over time of each case for the experiment.
- Figure 12 is a graph showing the minimum UDS over time of each case for the experiment.
- FIG. 13 is a view showing a state in which the incision perpendicular to the first virtual line on the basis of the deodorizing means to the DC electric furnace according to an embodiment of the present invention.
- An electric furnace using a direct current electrode according to the present invention has a bottom surface formed with a tap hole 110, as shown in Figure 1, the main body 100 for providing an internal space in which the scrap is charged; A lower electrode 200 mounted on the bottom surface; And a deodorizing means 300 which is provided on the bottom surface of the lower electrode 200 so as not to interfere with the gas, into the inner space of the main body 100.
- the main body 100 constitutes a DC electric furnace and has an inner wall and a bottom surface. Scrap is charged in the inner space formed by the inner wall and the bottom surface. Refractories are built in the inner wall for protection of the body 100 from high temperatures.
- the tapping hole 110 is formed on the bottom surface, the scrap is dissolved in accordance with the operation step and is raised and lowered by the ladle through the tapping outlet 110 after the heating.
- the lower electrode 200 is mounted at the center of the bottom surface.
- the lower electrode 200 dissolves the scrap by forming an arc column with an electrode rod mounted on the upper side with DC electricity with the scrap interposed therebetween.
- a low odor means 300 is provided at a position where interference with the lower electrode 200 on the bottom surface does not occur for low odor agitation to inject gas into the internal space of the main body 100 from the bottom.
- a direct porous plug may be used as the low intake means 300 for blowing gas in this way.
- argon (Ar) gas, nitrogen (N 2 ) gas, or the like may be used as the gas blown from the low odor means 300.
- the error rate for tapping could also be increased by about 0.5% compared to the case where no odor was applied.
- a plurality of collecting means 300 may be provided, and may be disposed at a position spaced a predetermined distance from the lower electrode 200.
- the stability means 300 is secured by arranging the lowering means 300 at the corresponding position.
- the plurality of deodorizing means 300 is disposed at the optimum position derived to secure the stirring force of the molten steel as much as possible. This is because once the stability is secured, the lower odor means 300 is more effective in increasing the stirring force of the molten steel.
- the collecting means 300 is (5/8) from the center of the lower electrode 200. It may be arranged at a position of * R ⁇ (7/8) * R.
- the collecting means 300 is spaced apart from the lower electrode 200 because the interference with the lower electrode 200 should not occur. It is reasonable that the closer to the refractory built up on the inner wall of the c), the more it may damage the refractory by the gas injected from the lower odor means (300).
- the taking means 300 is positioned at a position of (5/8) * R to (7/8) * R from the center of the lower electrode 200. To place it. If the collecting means 300 is disposed at a position that is less than the distance from the center of the lower electrode 200 to (5/8) * R, the lower collecting means 300 is closer to the lower electrode 200 and lower electrode 200. ) May be damaged.
- the lowering means 300 when the lowering means 300 is disposed at a position exceeding the distance from the center of the lower electrode 200 to (7/8) * R, the lowering means 300 is closer to the refractory built up on the inner wall and is applied to the refractory. It can be damaged. Therefore, it is appropriate that the collecting means 300 is disposed at a position of (5/8) * R to (7/8) * R from the center of the lower electrode 200.
- the bottom surface is divided into a tapping area in which the tapping hole 110 is formed on the opposite side of the tapping area on the basis of the center of the lower electrode 200, but the deodorizing means 300 is represented in FIG. 1. At least one may be disposed at a position at which the first virtual line 10 serving as a reference of the tapping area and the unloading area is placed.
- the collecting means 300 is disposed at a position spaced apart from the center of the lower electrode 200 by a predetermined distance, and disposed on the side of the tap area where the tap hole 110 exists.
- the deodorizing means 300 may be disposed at a position at which the first virtual line 10 dividing the tapping area and the nodal area passes through the lower electrode 200 at a predetermined distance from the lower electrode 200.
- the above position on the bottom of the main body 100 is formed in two places.
- the reducing means may be arranged in at least one of two places.
- the reason for disposing the collecting means 300 at a position where the lower electrode 200 is spaced apart from the lower electrode 200 and the first virtual line 10 passes is as follows.
- the computer simulation results show that the cold zone is formed at such a position.
- the location where the cold zone is formed due to insufficient agitation is likely to form a mass and consequently deteriorate the quality of molten steel.
- it corresponds to the position where the sub-material such as quicklime falls it is necessary to secure the stirring force so that such sub-material can be sufficiently mixed with the molten steel.
- the low-take means 300 by placing the low-take means 300 at a position where the first electrode virtual line 10 is spaced apart from the lower electrode 200 by a certain distance to secure the stirring force to suppress the formation of the cold zone and further suppress the occurrence of the ingot As a result, the quality of molten steel can be improved.
- the deodorizing means 300 is based on the second virtual line 20 connecting the center of the lower electrode 200 and the tap hole 110 as a reference to the second virtual line 20. At least one or more may be disposed at positions spaced equally on both sides.
- the lowering means 300 is disposed around the tap hole 110, and the center connecting the tap hole 110 and the center of the lower electrode 200 shown in FIG. At least one of the second virtual lines 20 may be disposed on both sides of the second virtual line 20.
- the reason for arranging the collecting means 300 at a position spaced at the same distance to both sides of the second virtual line 20 is as follows. As described above, through computer simulation results, it can be seen that a cold zone is formed at such a position. The location where the cold zone is formed due to insufficient agitation is likely to form a mass and consequently deteriorate the quality of molten steel. In addition, there is a risk that the slag is leaked through the tapping hole 110 during tapping of the molten steel, and the slag is injected into the molten steel by blowing a certain amount of gas through the lowering means 300 disposed near the tapping tap 110 during tapping. It can be prevented from leaking together.
- the collecting means 300 by placing the collecting means 300 at a position spaced at the same distance on both sides of the second virtual line 20, it is possible to improve the quality of the molten steel and prevent the outflow of slag.
- the virtual model is generated by DC electricity and the time of agitation is confirmed by measuring the time of diffusion through the concentration of the UDS (User Defined Scholar) volume over time.
- UDS User Defined Scholar
- the internal temperature of the virtual model is set to about 1750K
- the heat flux which is the heat flux per unit area
- the upper electrode is set to 0V and the lower electrode 200 is set to 700V.
- the diffusion time of the UDS volume having a diffusion rate of 0.004 kg / ms is measured.
- positioned is A, B where the above-mentioned 1st virtual line 10 passes, and the same distance to both sides of the 2nd virtual line 20 is carried out.
- the spaced apart positions C and D were tested while varying the arrangement of the lowering means 300 as shown in Table 2.
- the UDS volume is considered to be completely diffused.
- FIG. 4A compares Csae1, Case 2, Case 3, Case 4, Case 5, Case 6, and Case 7, and the first graph shows the time taken until the minimum value of the numerical value representing the concentration in the virtual model reaches 3977.
- the second graph is a graph showing the time taken until the maximum value of the numerical value representing the concentration in the virtual model reaches 3977.
- 4b is a graph showing the time taken until the difference between the maximum value and the minimum value of the numerical value representing the concentration is zero, comparing Csae1, Case 2, Case 3, Case 4, Case 5, Case 6, and Case 7
- the second graph is --------------------------------------------------------------------------------------------------- Formula (1)
- 5 and 6 show graphs comparing absolute values and graphs of relative values of low case oil odors of 80 NL / min.
- the absolute value the less time it takes to reach zero, the faster the diffusion rate.
- the relative value the faster the diffusion rate is, the farther it is from 1 as time passes.
- FIG. 10 is a graph illustrating a graph comparing a relative value and a graph comparing Case 1 and Absolute values of Case 7, Case 9, and Case 12 in which the low odor means 300 is disposed at B, C, and D, and the low odor flow rate is different.
- FIG. 11 shows graphs comparing Case 1 and absolute values of Case 3, Case 10, and Case 13 in which the low odor means 300 are disposed in A, B, and C, but having different low odor flow rates.
- the graph of FIG. 12 is a graph comparing the time at which stirring was performed under each condition by comparing the time at which the minimum value transition of the numerical value representing the concentration reached 95% (3778.2) of the reference value 3977.
- Table 3 shows the time when the minimum value for each case reaches 95% of the reference value.
- the low odor means 300 When the low odor means 300 are arranged in three places, when the low odor flow rate value is 80 NL / min, the effect of agitation is higher than that of the low odor means 300 at B, C, and D than at A, B, and C. However, when the low odor flow rate values were 150 NL / min and 300 NL / min, it was more effective to arrange the low odor means 300 in A, B, and C.
- the bottom surface of the main body 100 is formed to be inclined deeper toward the lower electrode 200 in the center from the inner wall, the gas blowing direction of the low-take means 300 Can be perpendicular to the inclined portion.
- the gas blowing direction of the low intake means 300 is formed vertically in the inclined portion, the gas can be injected toward the center of the inner space of the main body 100, so that the overall stirring effect of the molten steel can be expected.
- the gas blowing direction is formed in a direction away from the inner wall of the main body 100, there is less possibility of being directly injected into the refractory, thereby preventing damage to the refractory due to low odor.
- the flow rate supplied from the deodorizing means 300 may vary according to the operation time.
- the operation of the electric furnace can be classified into a primary dissolving machine for dissolving iron sources such as scrap, a secondary dissolving machine, a temperature raising device for raising the temperature of molten steel, a tapping time for tapping the molten steel, and an operation standby time.
- a primary dissolving machine for dissolving iron sources such as scrap
- a secondary dissolving machine a temperature raising device for raising the temperature of molten steel
- a tapping time for tapping the molten steel
- an operation standby time As shown in Table 4, the appropriate low odor flow rate is set for each operation time point and is supplied through the low odor means 300.
- first virtual line 20 second virtual line
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
| 전력원단위(kWh/ton-steel) | 종점산소ppm | Al원단위(kg/ton-steel) | 출강 실수율(%) | |
| 저취 미적용(320회) | 478 | 827 | 3.7 | 89.1 |
| 저취 적용(380회) | 454 | 711 | 3.3 | 89.6 |
| 저취 유량 | 저취 위치 | |
| Case 1 | 저취 없음 | - |
| Case 2 | 저취(80 NL/min) | C |
| Case 3 | 저취(80 NL/min) | A, B, C |
| Case 4 | 저취(80 NL/min) | A, C |
| Case 5 | 저취(80 NL/min) | C, D |
| Case 6 | 저취(80 NL/min) | B, C |
| Case 7 | 저취(80 NL/min) | B, C, D |
| Case 8 | 저취(150 NL/min) | C, D |
| Case 9 | 저취(150 NL/min) | B, C, D |
| Case 10 | 저취(150 NL/min) | A, B, C |
| Case 11 | 저취(300 NL/min) | C, D |
| Case 12 | 저취(300 NL/min) | B, C, D |
| Case 13 | 저취(300 NL/min) | A, B, D |
| 최소값이 평균의 95%에 도달하는 시간(sec) | |
| Case 1 | 448 |
| Case 2 | 446 |
| Case 3 | 334 |
| Case 4 | 334 |
| Case 5 | 332 |
| Case 6 | 384 |
| Case 7 | 330 |
| Case 8 | 328 |
| Case 9 | 272 |
| Case 10 | 248 |
| Case 11 | 324 |
| Case 12 | 270 |
| Case 13 | 246 |
| 시점 | 유량(NL/min) | |
| 1차 용해기 | ~투입 전력량 5000kWh | 40 |
| ~투입 전력량 10000kWh | 40 | |
| ~투입 전력량 30000kWh | 40 | |
| 2차 용해기 | ~투입 전력량 5000kWh | 40 |
| ~투입 전력량 10000kWh | 60 | |
| ~투입 전력량 70000kWh | 80 | |
| 승열기 | ~투입 전력량 3000kWh | 100 |
| ~투입 전력량 20000kWh | 150 | |
| ~투입 전력량 30000kWh | 150 | |
| 출강시 | ~2분 | 40 |
| ~출강 완료 | 60 | |
| ~출강 완료 후 | 40 | |
| 조업 대기시 | ~1시간 | 40 |
| ~2시간 | 60 | |
| ~ | 40 |
Claims (7)
- 직류전극을 이용하는 전기로로서,출강구가 형성된 바닥면을 가지며, 스크랩이 장입되는 내부공간을 제공하는 본체;본체의 바닥면에 장착되는 하부전극; 및하부전극과 간섭이 일어나지 않는 바닥면에 구비되어 본체의 내부공간에 기체를 취입시키는 저취수단;을 포함하는 DC전기로.
- 청구항 1에 있어서,저취수단은 복수 개가 구비되며, 하부전극을 중심으로 일정거리 이격된 위치에 배치되는 것을 특징으로 하는 DC전기로.
- 청구항 2에 있어서,하부전극의 중심과 가장 가까운 측의 본체 내측벽까지의 거리를 R로 할 때,저취수단은 하부전극의 중심으로부터 (5/8)*R~(7/8)*R인 위치에 배치된 것을 특징으로 하는 DC전기로.
- 청구항 2에 있어서,바닥면은 하부전극의 중심을 기준으로 하여 출강구가 형성된 출강영역과 반대측의 노전영역으로 구분하되,저취수단은 출강영역과 노전영역의 기준이 되는 제1가상의 선이 놓이게 되는 위치에 적어도 하나 이상이 배치된 것을 특징으로 하는 DC전기로.
- 청구항 2에 있어서,저취수단은 하부전극의 중심과 출강구를 잇는 제2가상의 선이 기준이 되어 제2가상의 선 양측으로 동일거리 이격된 위치에 적어도 하나 이상이 배치된 것을 특징으로 하는 DC전기로.
- 청구항 1에 있어서,본체의 바닥면은 내측벽으로부터 중앙부의 하부전극으로 갈수록 깊어지도록 경사지게 형성되며,저취수단의 기체 취입방향은 경사진 부분과 수직을 이루는 것을 특징으로 하는 DC전기로.
- 청구항 1에 있어서,조업 시점에 따라 저취수단으로부터 공급되는 유량이 변화되는 것을 특징으로 하는 DC전기로.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201580075223.7A CN107208972A (zh) | 2015-12-21 | 2015-12-24 | Dc电炉 |
| US15/545,845 US20180335215A1 (en) | 2015-12-21 | 2015-12-24 | Dc electric furnace |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2015-0182897 | 2015-12-21 | ||
| KR1020150182897A KR101755948B1 (ko) | 2015-12-21 | 2015-12-21 | Dc전기로 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2017111190A1 true WO2017111190A1 (ko) | 2017-06-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2015/014238 Ceased WO2017111190A1 (ko) | 2015-12-21 | 2015-12-24 | Dc전기로 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20180335215A1 (ko) |
| KR (1) | KR101755948B1 (ko) |
| CN (1) | CN107208972A (ko) |
| WO (1) | WO2017111190A1 (ko) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108866274A (zh) * | 2018-08-01 | 2018-11-23 | 山东钢铁股份有限公司 | 一种转炉动态脱氧控制系统及方法 |
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| US5177763A (en) * | 1990-03-28 | 1993-01-05 | Kawasaki Steel Corporation | Furnace bottom structure of direct current electric furnace |
| JPH0448189A (ja) * | 1990-06-15 | 1992-02-18 | Daido Steel Co Ltd | 直流アーク炉の操業方法 |
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- 2015-12-21 KR KR1020150182897A patent/KR101755948B1/ko not_active Expired - Fee Related
- 2015-12-24 CN CN201580075223.7A patent/CN107208972A/zh active Pending
- 2015-12-24 US US15/545,845 patent/US20180335215A1/en not_active Abandoned
- 2015-12-24 WO PCT/KR2015/014238 patent/WO2017111190A1/ko not_active Ceased
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| CN108866274A (zh) * | 2018-08-01 | 2018-11-23 | 山东钢铁股份有限公司 | 一种转炉动态脱氧控制系统及方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20170074278A (ko) | 2017-06-30 |
| US20180335215A1 (en) | 2018-11-22 |
| CN107208972A (zh) | 2017-09-26 |
| KR101755948B1 (ko) | 2017-07-10 |
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