CN110756788A - Application method of double-vacuum cast steel ingot tundish - Google Patents
Application method of double-vacuum cast steel ingot tundish Download PDFInfo
- Publication number
- CN110756788A CN110756788A CN201910933328.1A CN201910933328A CN110756788A CN 110756788 A CN110756788 A CN 110756788A CN 201910933328 A CN201910933328 A CN 201910933328A CN 110756788 A CN110756788 A CN 110756788A
- Authority
- CN
- China
- Prior art keywords
- tundish
- vacuum
- steel
- double
- ladle
- 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.)
- Pending
Links
Images
Classifications
-
- 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
- B22D41/02—Linings
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides an application method of a double-vacuum steel ingot casting tundish, wherein the tundish comprises a steel skeleton and a magnesia carbon brick layer lining, a heat insulation layer is arranged between the steel skeleton and the magnesia carbon brick layer lining and filled with castable, a sliding nozzle device is arranged on the bottom magnesia carbon brick layer lining, and ladle lifting lugs are arranged at two ends of the steel skeleton. The tundish can replace a common steel ladle to be applied in the molten steel refining process, the empty tundish used for refining is insulated and then used as the tundish in vacuum casting, the baking of the tundish and the saturation of the temperature of the steel ladle can be reduced, the temperature stability of the casting process is effectively controlled, meanwhile, the molten steel is poured into the tundish to be cast, the scum on the liquid level of the molten steel can be effectively filtered, and the casting is carried out when the liquid level reaches the proper height, so that the defect that the slag is sucked into an ingot mold to clamp the slag is avoided.
Description
Technical Field
The invention relates to a vacuum ingot casting technology, in particular to an application method of a double-vacuum ingot casting tundish.
Background
At present, molten steel vacuum pouring mainly adopts two modes of indirect pouring of a steel ladle with a tundish and direct pouring of a steel ladle without the tundish. The direct pouring of the ladle without the tundish easily causes the defect of slag inclusion caused by the suction of steel slag into the ingot mould, so the indirect pouring mode of the ladle with the tundish is indispensable to vacuum steel ingots with higher requirements.
The tundish is a device which is positioned between a steel ladle and a vacuum chamber and is used for pouring molten steel, and has the main functions of realizing vacuum sealing, storing the molten steel, stabilizing a molten steel flow field, promoting inclusions to further float upwards and avoiding slag entrapment in the pouring process. At present, among the vacuum gating system of each enterprise home and abroad, the multi-purpose high alumina matter of resistant firebrick of pouring basket inside lining or spinel matter, the pouring basket inner wall is very easily glued and is stayed bold incomplete steel residue, lead to being disposable, need clear up incomplete steel and residue after the pouring basket temperature drops to the room temperature after having poured, workman intensity of labour is big like this, operational environment is abominable, and need toast the pouring basket before the pouring, but the pouring basket temperature that utilizes the natural gas to toast is inhomogeneous, unsaturated leads to pouring process temperature uncontrolled.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an application method of a double-vacuum steel ingot casting tundish, which is used for solving the problems that the baking temperature of the tundish in the prior art is not uniform, the residual steel and the residual slag need to be cleaned after casting, the labor intensity of workers is high, the working environment is severe, and the slag is easy to absorb into an ingot mould during casting, so that the slag inclusion defect is caused.
In order to realize the above and other related purposes, the tundish comprises a steel skeleton and a magnesia carbon brick layer lining, a heat preservation layer is arranged between the steel skeleton and the magnesia carbon brick layer lining, the heat preservation layer is filled with castable, a sliding nozzle device is arranged on the magnesia carbon brick layer lining at the bottom of the tundish, ladle lifting lugs are arranged at two ends of the steel skeleton, and the application method of the double-vacuum cast steel ingot tundish comprises the following steps:
and (3) refining in an LF (ladle furnace): at least one double-vacuum steel ingot casting tundish is used as a ladle, and the molten steel after primary smelting is deoxidized and desulfurized in vacuum, inert gas or reducing atmosphere, inclusion is removed, and fine adjustment of components is carried out;
vacuum pouring: a. firstly, preserving heat of an empty tundish used in the refining step of an LF furnace, placing the empty tundish on a vacuum tank cover in advance, sealing the joint of the empty tundish and the vacuum tank cover by using a sealing rubber strip, vacuumizing, and exhausting air in the empty tundish by using argon; b. and pouring the refined molten steel into a tundish, and opening a tundish nozzle for pouring when the liquid level of the molten steel in the tundish rises to an effective height, the temperature meets the process requirement and the vacuum degree meets the pouring condition.
In an embodiment of the present invention, in the LF furnace refining step, more than two double vacuum ingot casting tundishes are used as ladles, one of the tundishes is used as the empty tundish, and the remaining tundishes are used as ladles for vacuum casting.
In an embodiment of the present invention, before the vacuum casting step, the rest of the tundish is subjected to a vacuum degassing step, wherein the vacuum degassing step includes: and putting the rest tundish into a vacuum chamber of a VD type vacuum degassing furnace, vacuumizing to below 67Pa, blowing argon at the ladle bottom, stirring, performing oxygen determination and hydrogen determination after reaching the specified temperature and pressure maintaining time, and tapping.
In an embodiment of the invention, a flow guide pipe is arranged at the position of the tundish bottom corresponding to the sliding water gap device and used for guiding the molten steel to a steel ingot mold in the vacuum tank.
As mentioned above, the application method of the double-vacuum ingot casting tundish disclosed by the invention has the following beneficial effects: (1) the double-vacuum steel ingot casting tundish is applied to the molten steel refining process instead of a common steel ladle, and the empty tundish used for refining is insulated, so that the baking of the tundish can be reduced, the temperature of the tundish is saturated, and the temperature stability of the pouring process is effectively controlled; (2) the tundish is seated on the vacuum tank cover in advance, argon is introduced into the tundish bottom for evacuation, and secondary oxidation of molten steel is avoided; (3) the lining of the tundish is a magnesia carbon brick layer which is different from the lining of the traditional tundish spinel brick, is not easy to deform and scour-resistant and has good use working condition; (4) molten steel is poured into the tundish for casting, so that floating slag on the liquid level of the molten steel can be effectively filtered, and the casting is carried out when the liquid level reaches a proper height, so that the defect that slag is clamped because the steel slag is sucked into the ingot mold is avoided.
Drawings
Fig. 1 shows a schematic structural view of a double vacuum ingot for casting of steel used in the present invention.
Fig. 2 is a schematic structural view of the tundish shown in fig. 1, which is vacuum-cast according to a first embodiment.
FIG. 3 is a schematic view showing a structure of a tundish shown in FIG. 1 in a second embodiment of vacuum casting.
Description of the element reference numerals
1 Steel skeleton
2 insulating layer
3 magnesia carbon brick layer lining
4 sliding water gap device
5 ladle lifting lug
6 vacuum tank
7 sealing rubber strip
8 honeycomb duct
9 ingot mould
10 ladle
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings are only used for matching the disclosure of the present disclosure, and are not used for limiting the conditions that the present disclosure can be implemented, so that the present disclosure is not technically significant, and any structural modifications, ratio changes or size adjustments should still fall within the scope of the present disclosure without affecting the efficacy and the achievable purpose of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
The invention provides an application method of a double-vacuum cast steel ingot tundish, please refer to fig. 1, the tundish comprises a steel framework 1 and a magnesia carbon brick layer lining 3, the magnesia carbon brick layer lining 3 replaces the conventional high alumina or spinel, is not easy to deform and erode, and has good use working condition; set up heat preservation 2 between steel skeleton 1 and the magnesia carbon brick layer inside lining 3, the pouring material is filled to heat preservation 2, sets up sliding gate device 4 on the magnesia carbon brick layer inside lining of package end, and steel skeleton 1 both ends are provided with ladle lug 5 to supply the driving lifting hook.
The application of the double vacuum ingot casting tundish is described below by means of specific examples.
The first embodiment is as follows: see FIG. 2
(1) Primary smelting: respectively melting, dephosphorizing and decarbonizing the furnace materials of the three furnaces in an electric furnace in an oxidizing atmosphere;
(2) LF furnace (ladle furnace) refining: three double-vacuum steel ingot casting tundishes are used as ladles, namely, the original LF ladle is replaced, and the three-furnace molten steel after primary smelting is deoxidized and desulfurized in vacuum, inert gas or reducing atmosphere, so that impurities are removed and component fine adjustment is carried out; the molten steel in one tundish is used for casting a common steel ingot, the empty tundish is insulated after casting, and the molten steel in the other two tundishes is used for casting a double-vacuum steel ingot;
(3) vacuum degassing: putting two tundishes for pouring the double-vacuum cast steel ingot into a vacuum chamber of a VD-type vacuum degassing furnace (vacuum degassing furnace), vacuumizing to below 67Pa, blowing argon at the bottom of the tundishes at the same time, stirring, and performing oxygen determination, hydrogen determination and steel tapping after reaching the specified temperature and pressure maintaining time;
(4) vacuum pouring: a. firstly, preserving heat of a tundish subjected to common steel ingot casting after refining, sitting the tundish on a vacuum tank 6 cover in advance, placing an ingot mold 9 in the vacuum tank 6, installing a draft tube 8 at the position of the tundish bottom corresponding to a sliding water gap device 4 for introducing molten steel into the ingot mold 9 from the tundish, sealing the joint of the tundish and the vacuum tank 6 cover by using a sealing rubber strip 7, vacuumizing, and discharging air in the tundish in the air by using argon gas; b. pouring the refined first ladle molten steel in the LF furnace into a tundish, opening a tundish nozzle to pour when the molten steel level in the tundish rises to an effective height, the temperature meets the process requirement and the vacuum degree meets the pouring condition, pouring the refined second ladle molten steel in the LF furnace into the tundish, and pulling a lower sliding plate of a sliding nozzle device 4 to enable the nozzles of the upper sliding plate and the lower sliding plate to be concentric when the tundish is poured to achieve the effect of beginning to pour the molten steel into the ingot mold.
Example two: see FIG. 3
Compared with the first embodiment, in the first embodiment, one double-vacuum steel ingot casting tundish and two common steel ladles 10 are used during LF furnace refining, after refining is completed, molten steel in the double-vacuum steel ingot casting tundish is used for casting a common steel ingot, heat preservation is carried out on an empty tundish after casting, and molten steel in the other two common steel ladles is used for casting a double-vacuum steel ingot; then two common ladles for pouring double-vacuum steel ingots are placed into a VD vacuum chamber, the two common ladles are vacuumized to be below 67Pa, argon is blown to the ladle bottom at the same time, the two common ladles are stirred, oxygen determination and hydrogen determination are carried out after the specified temperature and pressure maintaining time are reached, and steel is tapped; finally, vacuum casting is carried out.
The common steel ingot casting refers to vacuum degassing of refined molten steel, and then placing a steel ladle subjected to vacuum degassing on a casting truck for casting a steel ingot.
In conclusion, the invention discloses an application method of a double-vacuum steel ingot casting tundish, which is characterized in that the tundish is applied to the molten steel refining process instead of a common steel ladle, and the empty tundish used for refining is subjected to heat preservation, so that the baking of the tundish can be reduced, the temperature of the tundish is saturated, and the temperature stability of the pouring process is effectively controlled; the tundish is seated on the vacuum tank cover in advance, argon is introduced into the tundish bottom for evacuation, and secondary oxidation of molten steel is avoided; the lining of the tundish is a magnesia carbon brick layer which is different from the lining of the traditional tundish spinel brick, is not easy to deform and scour-resistant and has good use working condition; molten steel is poured into the tundish for casting, so that floating slag on the liquid level of the molten steel can be effectively filtered, and the casting is carried out when the liquid level reaches a proper height, so that the defect that slag is clamped because the steel slag is sucked into the ingot mold is avoided. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (4)
1. An application method of a double-vacuum steel ingot casting tundish is characterized in that: the tundish comprises a steel skeleton and a magnesia carbon brick layer lining, a heat preservation layer is arranged between the steel skeleton and the magnesia carbon brick layer lining, the heat preservation layer is filled with a castable, a sliding nozzle device is arranged on the magnesia carbon brick layer lining at the bottom of the tundish, ladle lugs are arranged at two ends of the steel skeleton, and the application method of the double-vacuum cast steel ingot tundish comprises the following steps:
and (3) refining in an LF (ladle furnace): at least one double-vacuum steel ingot casting tundish is used as a ladle, and the molten steel after primary smelting is deoxidized and desulfurized in vacuum, inert gas or reducing atmosphere, inclusion is removed, and fine adjustment of components is carried out;
vacuum pouring: a. firstly, preserving heat of an empty tundish used in the refining step of an LF furnace, placing the empty tundish on a vacuum tank cover in advance, sealing the joint of the empty tundish and the vacuum tank cover by using a sealing rubber strip, vacuumizing, and exhausting air in the empty tundish by using argon; b. and pouring the refined molten steel into a tundish, and opening a tundish nozzle for pouring when the liquid level of the molten steel in the tundish rises to an effective height, the temperature meets the process requirement and the vacuum degree meets the pouring condition.
2. The application method of the double-vacuum ingot casting tundish according to claim 1, characterized by comprising the following steps: in the LF furnace refining step, more than two double-vacuum steel ingot casting tundishes are used as ladles, one of the tundishes is used as the empty tundish, and the other tundishes are used as ladles for vacuum casting.
3. The application method of the double-vacuum ingot casting tundish according to claim 2, characterized by comprising the following steps: before the vacuum pouring step, the rest of the tundishes are subjected to a vacuum degassing step, wherein the vacuum degassing step comprises the following steps: and putting the rest tundish into a vacuum chamber of a VD type vacuum degassing furnace, vacuumizing to below 67Pa, blowing argon at the ladle bottom, stirring, performing oxygen determination and hydrogen determination after reaching the specified temperature and pressure maintaining time, and tapping.
4. The application method of the double-vacuum ingot casting tundish according to any one of claims 1 to 3, characterized by comprising the following steps: and a flow guide pipe is arranged at the position of the tundish bottom corresponding to the sliding water gap device and is used for guiding the molten steel to the steel ingot mold in the vacuum tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910933328.1A CN110756788A (en) | 2019-09-29 | 2019-09-29 | Application method of double-vacuum cast steel ingot tundish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910933328.1A CN110756788A (en) | 2019-09-29 | 2019-09-29 | Application method of double-vacuum cast steel ingot tundish |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110756788A true CN110756788A (en) | 2020-02-07 |
Family
ID=69330851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910933328.1A Pending CN110756788A (en) | 2019-09-29 | 2019-09-29 | Application method of double-vacuum cast steel ingot tundish |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110756788A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101015852A (en) * | 2007-02-15 | 2007-08-15 | 浙江天马轴承股份有限公司 | Incorporated device for vacuum steel ladle degassing and vacuum casting a plurality of steel ingots |
| CN101352755A (en) * | 2008-09-18 | 2009-01-28 | 冬燕 | Equipment and technique for ladle-to-ladle, degasification and vacuum ingot casting of multiple-slide runner ladle |
| CN202963436U (en) * | 2012-12-06 | 2013-06-05 | 通裕重工股份有限公司 | Double-vacuum cast steel ingot middle ladle |
| JP6215409B1 (en) * | 2016-07-27 | 2017-10-18 | 黒崎播磨株式会社 | Mug carbon brick and molten steel pan using this |
| CN107350464A (en) * | 2017-06-28 | 2017-11-17 | 秦皇岛首秦金属材料有限公司 | A kind of continuous casting production recycling method |
| CN208408528U (en) * | 2018-05-28 | 2019-01-22 | 四川丰元机械制造有限公司 | A kind of continuous casting production with long service life |
-
2019
- 2019-09-29 CN CN201910933328.1A patent/CN110756788A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101015852A (en) * | 2007-02-15 | 2007-08-15 | 浙江天马轴承股份有限公司 | Incorporated device for vacuum steel ladle degassing and vacuum casting a plurality of steel ingots |
| CN101352755A (en) * | 2008-09-18 | 2009-01-28 | 冬燕 | Equipment and technique for ladle-to-ladle, degasification and vacuum ingot casting of multiple-slide runner ladle |
| CN202963436U (en) * | 2012-12-06 | 2013-06-05 | 通裕重工股份有限公司 | Double-vacuum cast steel ingot middle ladle |
| JP6215409B1 (en) * | 2016-07-27 | 2017-10-18 | 黒崎播磨株式会社 | Mug carbon brick and molten steel pan using this |
| CN107350464A (en) * | 2017-06-28 | 2017-11-17 | 秦皇岛首秦金属材料有限公司 | A kind of continuous casting production recycling method |
| CN208408528U (en) * | 2018-05-28 | 2019-01-22 | 四川丰元机械制造有限公司 | A kind of continuous casting production with long service life |
Non-Patent Citations (4)
| Title |
|---|
| 干勇: "《现代连续铸钢实用手册》", 31 March 2010, 冶金工业出版社 * |
| 朱鸿民: "《冶金研究2006年》", 30 April 2006, 冶金工业出版社 * |
| 李慧卿: "《2001中国钢铁年会论文集 （下卷）》", 31 October 2001, 冶金工业出版社 * |
| 武汉钢铁（集团）公司科学技术协会: "《魅力钢铁 钢铁的前世今生》", 1 October 2014, 冶金工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108676962B (en) | High-performance alloy ultra-pure purification vacuum induction melting system and use method thereof | |
| CN108273971A (en) | Method for reducing nitrogen increase of molten steel in continuous casting process | |
| EP2873742A2 (en) | Method and apparatus for electric arc furnace teeming | |
| CN111518992B (en) | Tank type single-nozzle refining furnace and vacuum refining method | |
| CN110756788A (en) | Application method of double-vacuum cast steel ingot tundish | |
| EP1372891B1 (en) | Apparatus for transferring liquid metals from a collection container to a receiving container | |
| CN100448568C (en) | Incorporated manufacturing technique for vacuum steel ladle degassing and vacuum casting a plurality of steel ingots | |
| CN210856202U (en) | Liquid metal smelting system | |
| US5645121A (en) | Method of continuous casting using sealed tundish and improved tundish seal | |
| CN210856207U (en) | Liquid metal refining device and liquid metal smelting system | |
| CN116372122A (en) | Method for reducing cracks at joint of ingot riser and ingot body | |
| CN112964062B (en) | Preparation method of crucible for vacuum induction melting furnace | |
| US3841385A (en) | Method and apparatus for teeming stream protection | |
| CN218799095U (en) | Ladle deslagging mechanism | |
| CN110257588B (en) | Liquid metal smelting system and smelting method | |
| CN212620066U (en) | Vacuum degassing device of large-capacity variable-frequency induction aluminum melting furnace | |
| CN113549728B (en) | Device for preventing converter from deslagging and shortening tapping time and using method | |
| CN113105251B (en) | Preparation method of crucible for vacuum induction melting furnace | |
| CN220745989U (en) | Small-sized ladle bottom blowing hydrogen rate control device | |
| JPH0220652A (en) | Method for melting and casting magnesium alloy | |
| JP2019155396A (en) | Slab casting device and slab casting method | |
| CN212664889U (en) | Smelting device and discharging device for ladle drainage sand | |
| CN116352066A (en) | Method for improving cleanliness of steel ladle molten steel in steelmaking process and reducing ladle surplus | |
| CN210548061U (en) | Refining furnace ladle insulation construction | |
| CN109385505B (en) | Method for obtaining reducing high-alkalinity white slag by vacuum control in VD furnace |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200207 |
|
| RJ01 | Rejection of invention patent application after publication |