CN114160777A - Steel ingot covering slag adding method capable of effectively controlling slag rolling - Google Patents
Steel ingot covering slag adding method capable of effectively controlling slag rolling Download PDFInfo
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- CN114160777A CN114160777A CN202111486840.XA CN202111486840A CN114160777A CN 114160777 A CN114160777 A CN 114160777A CN 202111486840 A CN202111486840 A CN 202111486840A CN 114160777 A CN114160777 A CN 114160777A
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- slag
- casting
- steel ingot
- effectively controlling
- compressed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
- B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B63/00—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged
- B65B63/02—Auxiliary devices, not otherwise provided for, for operating on articles or materials to be packaged for compressing or compacting articles or materials prior to wrapping or insertion in containers or receptacles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to the field of casting powder application in a casting process, in particular to a steel ingot casting powder adding method for effectively controlling slag rolling, which can be widely applied to casting of metal molds such as nonferrous metals, ferrous metals and the like and casting blank pouring. The method comprises the following specific steps: vacuum-compressing the casting powder by vacuum packaging or directly pressing and forming to form compressed casting powder in a flat plate state; the casting mould is placed at the bottom of an ingot mould or a casting cavity or hung at a certain height before casting, a layer of thick paper board is placed at the bottom of the compressed covering slag, so that metal liquid is prevented from splashing, the covering slag is prevented from dispersing, the slag is prevented from rolling up, the covering slag absorbs water to generate air rolling, and the purity of the metal liquid is ensured to ensure the casting quality.
Description
Technical Field
The invention relates to the field of casting powder application in a casting process, in particular to a steel ingot casting powder adding method for effectively controlling slag rolling, which can be widely applied to casting of metal molds such as nonferrous metals, ferrous metals and the like and casting blank pouring.
Background
The steel ingot protecting slag is one kind of synthetic slag covering the steel liquid surface inside the steel ingot mold or crystallizer during casting to stabilize the casting operation and improve the steel surface quality. Defects generated on the surface of the steel during casting, such as: heavy crust, turning, slag inclusion, cracks, etc., are often associated with the performance and operation of the mold flux. The casting powder has the following functions in the casting process: (1) preventing the molten steel from being reoxidized; (2) the heat loss of the liquid level of the steel is reduced, and the liquid level of the steel is prevented from being solidified and crusted early; (3) dissolving and absorbing impurities on the surface of the molten steel; (4) controlling the heat transfer speed of the steel billet and reducing the thermal stress generated by the temperature gradient in the thickness direction of the solidified layer of the steel billet; (5) and the lubricating function is realized between the crystallizer and the blank shell. The protecting slag is prepared from silicon dioxide, calcium monoxide and aluminium oxide by adding appropriate amount of alkaline earth oxide (such as Na)2O、Li2O、K2O, etc.), fluorides (e.g.: CaF2NaF, etc.) and carbonaceous materials (e.g.: graphite, coke, petroleum coke, carbon compounds, and the like).
Traditional covering slag adopts simple and easy packing, is mainly powdered, transports and the on-the-spot moisture of easily absorbing at the covering slag, and the covering slag heat conductivity and coefficient of heat conductivity are little leads to the covering slag to be difficult dry, and at the covering slag and add the initial stage simultaneously, the covering slag is easy to be ulcerated, produces and rolls up the sediment. The covering slag of the invention can ensure the drying of the covering slag for a long time and avoid absorbing moisture. Meanwhile, the casting powder which is not scattered in the initial casting stage is prevented from being involved, and the pressed casting powder can be quickly paved under the action of high-temperature molten steel, so that secondary oxidation of molten metal is ensured.
Disclosure of Invention
The invention aims to provide a steel ingot casting powder adding method for effectively controlling slag rolling, which solves the problems that the packaging and adding mode of the casting powder in the prior factory is unreasonable, and the stable filling and purity of molten metal are difficult to ensure.
The technical scheme of the invention is as follows:
a steel ingot covering slag adding method for effectively controlling slag rolling comprises the following steps:
1) vacuum-compressing the casting powder by vacuum packaging or directly pressing and forming to form compressed casting powder in a flat plate state;
2) before pouring, the casting mould is placed at the bottom of the ingot mould or the pouring cavity or hung in the ingot mould or the pouring cavity;
3) a layer of thick paperboard is placed at the bottom of the compressed covering slag, so that the metal liquid is prevented from splashing, the early dispersion and slag rolling of the covering slag are avoided, and the purity of the metal liquid is ensured to ensure the quality of castings.
The steel ingot casting powder adding method for effectively controlling the slag rolling comprises the step 1) of controlling the weight of each piece of compressed casting powder to be 1-5 kilograms.
The steel ingot covering slag adding method for effectively controlling slag rolling comprises the step 1), wherein in the step 1), vacuum compression is carried out by adopting paper bags or plastic bags for packaging, and the thickness of the paper bags or the plastic bags is 0.1-5 mm.
The steel ingot covering slag adding method for effectively controlling slag rolling comprises the step 1), and the steel ingot covering slag is directly pressed and formed and packaged by paper bags or plastic bags, wherein the thickness of the paper bags or the plastic bags is 0.1-5 mm.
According to the steel ingot casting powder adding method for effectively controlling the slag rolling, in the step 1), the thickness of the compressed casting powder is 5-200 mm, the shape is not limited, and the ratio of the length to the thickness is required to be 3: 1-10: 1.
According to the steel ingot covering slag adding method for effectively controlling slag rolling, the covering slag subjected to vacuum compression is prevented from absorbing water, the drying of the covering slag is ensured, and gas rolling is avoided.
The steel ingot casting powder adding method for effectively controlling the slag rolling comprises the step 2) of placing compressed casting powder at the central part of the bottom in a steel ingot mould or a casting cavity.
In the method for effectively controlling the addition of the steel ingot casting powder for slag rolling, in the step 2), the suspension height of the compressed casting powder is 0-350 mm away from the upper surface of the steel ingot mould or the casting cavity.
The steel ingot casting powder adding method for effectively controlling the slag entrapment comprises the step 3), the thickness of a paperboard placed at the bottom of the compressed casting powder is 1-5 mm, and the single-side area of the paperboard is 1-5 times of the surface area of a molten metal inlet.
In the method for effectively controlling the addition of the steel ingot casting slag for slag rolling, in the step 3), the area of the single surface of the paperboard is 0.5-1.5 times of the surface area of the compressed casting slag, but is smaller than the area of the bottom of the steel ingot mold or the casting cavity.
The design idea of the invention is as follows:
the invention relates to a steel ingot casting powder adding method for effectively controlling slag entrapment, which is characterized in that powdery casting powder is pressed into a blocky or cake-shaped high-density structure or is compressed into a blocky or cake-shaped high-density structure in a vacuum mode and is placed or hung in an ingot mould or the inner part or the bottom of a casting cavity, so that the powdery casting powder is prevented from being dispersed, and the slag entrapment is avoided at the initial stage of molten metal casting.
The invention has the following advantages and beneficial effects:
1. because the invention adopts vacuum package, the phenomena of moisture absorption of the casting powder during transportation and on-site storage are avoided. Because the thermal conductivity of the casting powder is low, the casting powder is difficult to dry and easy to absorb moisture, and hydrogen is increased due to links such as storage, transportation and the like, the defects of cracks, looseness and the like are not easy to cause by adopting vacuum packaging, gas entrainment is avoided, and the purity of the molten metal is ensured.
2. The invention adopts the addition of the compressed covering slag, avoids the collapsibility of the powdery covering slag, reduces or even avoids the defects of gas entrainment and slag entrainment, prevents the casting from generating cracks, looseness, inclusion and the like easily, and simultaneously greatly improves the performance and the service life of the casting.
3. The casting powder vacuum packaging and adding method is generally suitable for sand casting, metal mold casting and other processes of various alloys, and along with improvement of casting quality and service life, the stable mold filling design for effectively controlling air entrainment and slag entrainment becomes a new design principle.
Detailed Description
In the specific implementation process, the method for effectively controlling the addition of the steel ingot casting slag of the slag rolling comprises the following specific steps: the casting powder is subjected to vacuum compression through vacuum packaging or is directly pressed and formed to form a flat plate state with a certain thickness, the flat plate state is placed at the bottom of an ingot mold or a casting cavity or hung at a certain height before casting, a layer of thick paper plate is placed at the bottom of the compressed casting powder to prevent molten metal from splashing, prevent the casting powder from dispersing and rolling up slag and prevent the casting powder from absorbing water to generate rolling gas, and ensure the purity of the molten metal and the quality of castings.
The present invention will be described in further detail below with reference to examples.
Example 1:
in this example, steel type 45# was poured, 6 ingots of 5 tons were poured, 2.5 kg of vacuum compression-packed mold powder was added to each ingot mold, and the mold powder was packed in paper bags, the thickness of which was 0.3mm, for a total of 5 kg. The thickness of the covering slag is 50mm, the covering slag is subjected to vacuum compression, long-time drying is carried out before pressing, the drying temperature is not lower than 70 ℃, a round cake shape with the diameter of 300mm is formed, the covering slag is hung in a steel ingot mold, the hanging height is 250mm away from the upper surface of the steel ingot mold, a paperboard with the thickness of 2mm is placed at the bottom of the covering slag, 2 layers are placed, and the single-side area of the paperboard is 3 times of the surface area of a molten metal inlet. The covering slag is placed at the central part of the bottom of the steel ingot. The pouring time of the steel ingot is 9 minutes, and the quality of the steel ingot is good.
Example 2:
in this example, a steel grade of 42CrMo was cast, 4 ingots of 8 tons were cast, 2 bags of vacuum compression-packed mold powder of 4 kg were added to each ingot mold, and the mold powder was packed in paper bags, the thickness of which was 0.5mm, for a total of 8 kg. The thickness of the covering slag is 80mm, the covering slag is subjected to vacuum compression, long-time drying is carried out before pressing, the drying temperature is not lower than 75 ℃, the diameter of a cake is 350mm, the covering slag is hung in a steel ingot mold, the hanging height is 220mm away from the upper surface of the steel ingot mold, a paperboard with the thickness of 2mm is placed at the bottom of the covering slag, 2 layers are placed, and the single-side area of the paperboard is 4 times of the surface area of a molten metal inlet. The covering slag is placed at the central part of the bottom of the steel ingot. The pouring time of the steel ingot is 12 minutes, and the quality of the steel ingot is good.
Example 3:
in the embodiment, the 18CrNiMo7-6# steel is poured, 6 steel ingots of 10 tons are poured, 5 kilograms of vacuum compression package covering slag are added into each steel ingot mould for 2 bags, and the steel ingots are packaged by paper bags, wherein the thickness of each paper bag is 0.8mm, and the total weight is 10 kilograms. The thickness of the covering slag is 100mm, the covering slag is subjected to vacuum compression, long-time drying is carried out before pressing, the drying temperature is not lower than 70 ℃, the diameter of a formed round cake is 450mm, the covering slag is hung in a steel ingot mold, the hanging height is 240mm away from the upper surface of the steel ingot mold, a paperboard with the thickness of 2mm is placed at the bottom of the covering slag, 2 layers are placed, and the single-side area of the paperboard is 3 times of the surface area of a molten metal inlet. The covering slag is placed at the central part of the bottom of the steel ingot. The pouring time of the steel ingot is 15 minutes, and the quality of the steel ingot is good.
The embodiment results show that the design of the casting powder of the invention, which is used for carrying out vacuum compression or direct compression molding on the casting powder, avoids secondary oxidation, gas entrainment and slag entrainment generated in the pouring process of molten metal, and ensures the purity of the molten metal and the quality of castings.
Claims (10)
1. A steel ingot covering slag adding method for effectively controlling slag rolling is characterized by comprising the following steps:
1) vacuum-compressing the casting powder by vacuum packaging or directly pressing and forming to form compressed casting powder in a flat plate state;
2) before pouring, the casting mould is placed at the bottom of the ingot mould or the pouring cavity or hung in the ingot mould or the pouring cavity;
3) a layer of thick paperboard is placed at the bottom of the compressed covering slag, so that the metal liquid is prevented from splashing, the early dispersion and slag rolling of the covering slag are avoided, and the purity of the metal liquid is ensured to ensure the quality of castings.
2. The steel ingot mold flux adding method for effectively controlling slag entrapment as claimed in claim 1, wherein in the step 1), the weight of each compressed mold flux is controlled to be 1-5 kg.
3. The steel ingot casting slag adding method for effectively controlling slag rolling according to claim 1, wherein in the step 1), the vacuum compression is carried out by packaging with a paper bag or a plastic bag, and the thickness of the paper bag or the plastic bag is 0.1-5 mm.
4. The steel ingot casting powder adding method capable of effectively controlling slag rolling according to claim 1, wherein in the step 1), the steel ingot casting powder is directly pressed and formed and packaged by paper bags or plastic bags, and the thickness of the paper bags or the plastic bags is 0.1-5 mm.
5. The method for adding the steel ingot casting powder for effectively controlling the slag entrapment as claimed in claim 1, wherein in the step 1), the thickness of the compressed casting powder is 5-200 mm, the shape is not limited, and the required length-thickness ratio is 3: 1-10: 1.
6. The steel ingot mold flux adding method for effectively controlling slag entrapment according to claim 1, wherein the vacuum-compressed mold flux prevents the mold flux from absorbing water, ensures the mold flux to be dry, and prevents air entrapment.
7. The ingot mold flux adding method for efficiently controlling the slag inclusion according to claim 1, wherein in the step 2), the compressed mold flux is placed at a bottom center portion in the ingot mold or the casting cavity.
8. The steel ingot mold flux adding method for effectively controlling the slag entrapment as claimed in claim 1, wherein in the step 2), the height of the compressed mold flux hanging is 0 to 350mm from the upper surface of the steel ingot mold or the casting cavity.
9. The steel ingot casting powder adding method for effectively controlling slag entrapment according to claim 1, wherein in the step 3), the thickness of a paperboard placed at the bottom of the compressed casting powder is 1-5 mm, and the area of a single surface of the paperboard is 1-5 times of the surface area of a molten metal inlet.
10. The steel ingot mold flux adding method for effectively controlling the slag entrapment as claimed in claim 1, wherein in the step 3), the area of the single surface of the paperboard is 0.5 to 1.5 times of the surface area of the compressed mold flux, but is smaller than the bottom area of the steel ingot mold or the casting cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111486840.XA CN114160777A (en) | 2021-12-07 | 2021-12-07 | Steel ingot covering slag adding method capable of effectively controlling slag rolling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111486840.XA CN114160777A (en) | 2021-12-07 | 2021-12-07 | Steel ingot covering slag adding method capable of effectively controlling slag rolling |
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| Publication Number | Publication Date |
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| CN114160777A true CN114160777A (en) | 2022-03-11 |
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| CN202111486840.XA Pending CN114160777A (en) | 2021-12-07 | 2021-12-07 | Steel ingot covering slag adding method capable of effectively controlling slag rolling |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1554715A (en) * | 1967-10-13 | 1969-01-24 | ||
| CN1036156A (en) * | 1988-04-01 | 1989-10-11 | 冶金工业部攀枝花钢铁公司钢铁研究院 | Die casting method for producing killed steel ingots with top-sealing |
| CN1057218A (en) * | 1991-01-31 | 1991-12-25 | 田志晓 | Composite protection board |
| CN1122734A (en) * | 1994-11-11 | 1996-05-22 | 伍本华 | Composition bentonite protection slag |
| CN102407296A (en) * | 2010-09-25 | 2012-04-11 | 宝山钢铁股份有限公司 | Pouring stream protection method and protection device |
| CN104985143A (en) * | 2015-06-10 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Mold casting method |
| JP2017131957A (en) * | 2016-01-29 | 2017-08-03 | 株式会社神戸製鋼所 | Downward casting method |
| JP2018134674A (en) * | 2017-02-23 | 2018-08-30 | 株式会社神戸製鋼所 | Lower injection ingot-making method |
| CN111250678A (en) * | 2020-03-25 | 2020-06-09 | 攀钢集团江油长城特殊钢有限公司 | Production process of die-cast steel ingot for reducing flaw detection defects |
-
2021
- 2021-12-07 CN CN202111486840.XA patent/CN114160777A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1554715A (en) * | 1967-10-13 | 1969-01-24 | ||
| CN1036156A (en) * | 1988-04-01 | 1989-10-11 | 冶金工业部攀枝花钢铁公司钢铁研究院 | Die casting method for producing killed steel ingots with top-sealing |
| CN1057218A (en) * | 1991-01-31 | 1991-12-25 | 田志晓 | Composite protection board |
| CN1122734A (en) * | 1994-11-11 | 1996-05-22 | 伍本华 | Composition bentonite protection slag |
| CN102407296A (en) * | 2010-09-25 | 2012-04-11 | 宝山钢铁股份有限公司 | Pouring stream protection method and protection device |
| CN104985143A (en) * | 2015-06-10 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Mold casting method |
| JP2017131957A (en) * | 2016-01-29 | 2017-08-03 | 株式会社神戸製鋼所 | Downward casting method |
| JP2018134674A (en) * | 2017-02-23 | 2018-08-30 | 株式会社神戸製鋼所 | Lower injection ingot-making method |
| CN111250678A (en) * | 2020-03-25 | 2020-06-09 | 攀钢集团江油长城特殊钢有限公司 | Production process of die-cast steel ingot for reducing flaw detection defects |
Non-Patent Citations (3)
| Title |
|---|
| 丘依科，H.M.等: "《改善钢质量的炉外方法》", 30 September 1983, 冶金工业出版社, pages: 114 - 115 * |
| 干勇等: "《炼钢-连铸新技术800问》", 30 September 2003, 冶金工业出版社, pages: 470 * |
| 武建民: "钢液浇铸保护渣", 包钢科技, no. 03, pages 231 - 28 * |
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