CN112404377A - Molten steel bottom pouring injection pipe assembly and pouring method thereof - Google Patents
Molten steel bottom pouring injection pipe assembly and pouring method thereof Download PDFInfo
- Publication number
- CN112404377A CN112404377A CN202011309182.2A CN202011309182A CN112404377A CN 112404377 A CN112404377 A CN 112404377A CN 202011309182 A CN202011309182 A CN 202011309182A CN 112404377 A CN112404377 A CN 112404377A
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- China
- Prior art keywords
- protective cover
- wall
- combustible
- molten steel
- pouring
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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
- B22D9/00—Machines or plants for casting ingots
- B22D9/006—Machines or plants for casting ingots for bottom casting
-
- 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
- B22D7/12—Appurtenances, e.g. for sintering, for preventing splashing
Abstract
The invention provides a molten steel bottom pouring and middle pouring pipe assembly which comprises a middle pouring pipe, wherein a protective cover is arranged on the outer wall of an upper port of the middle pouring pipe, an annular pipeline is arranged on the inner wall of the protective cover, air outlet holes are formed in the side walls of the pipeline and the protective cover, and combustible materials are arranged on the outer wall of the protective cover. Also provided is a method of casting: combustible materials are fixed on the outer wall of the protective cover; introducing argon into the pipeline, discharging the argon into the protective cover from the air hole of the pipeline to form an argon protective layer, igniting combustible, and combusting the combustible to form a flame sealing layer on the outer wall of the protective cover; and finally, casting. The outer wall of the protective cover is provided with the combustible, so that the combustible is ignited during pouring, oxygen is consumed during burning, and oxygen nearby the outer part of the protective cover can be consumed, thereby preventing molten steel from absorbing oxygen, and ensuring the mechanical property of steel ingots. The invention is very convenient to operate and implement and can save the cost.
Description
Technical Field
The invention relates to the technical field of steel ingot manufacturing, in particular to a molten steel bottom pouring injection pipe assembly and a pouring method thereof.
Background
The method for preparing the steel ingot blank by adopting the bottom casting mode belongs to a relatively universal process technology at home and abroad. However, in the process of bottom pouring steel, a free space of 100 mm-300 mm exists between the steel ladle and the injection pipe, which easily causes secondary air suction of molten steel in the pouring process and reduces the purity of the molten steel. At present, many bottom-pouring steel ingot production at home and abroad adopts an argon protection device to prevent molten steel from being oxidized, as shown in figure 1, an entity sealing cover 2 is mainly placed between a pouring nozzle and a middle pouring pipe 1, a plurality of annular steel pipes 3 are also arranged in the sealing cover 2, holes or slits are drilled in the steel pipes 3, argon is introduced into the annular steel pipes 3 during pouring, and the argon flows out from holes or slits of the steel pipes 3 to form an argon protection layer 4. The devices have the disadvantages that the sealing cover 2 is arranged on the middle pouring pipe 1, a gap exists between the sealing cover and a ladle nozzle, when molten steel is poured, negative pressure is formed in the middle pouring pipe 1 due to the flowing of the molten steel, and partial air enters the middle pouring pipe 1 from the gap, so that the quality of poured steel ingots is influenced. In the casting process of general medium-low alloy steel, hydrogen is increased by more than 1PPm, oxygen is increased by 5-10 PPm, and the nitrogen increase amount is more than 20 PPm; the gas content of medium and high alloy steels increases even more. The mechanical properties of the material are reduced by increasing the gas content in the ingot, so that a more hermetic protection must be used.
Prior art such as application number 201920427687.5, 201710847056.4 all improve the leakproofness through seal structure, and the structure is comparatively complicated, is unfavorable for improving pouring efficiency.
In addition, the invention application with the application number of 202010361612.9 discloses a casting method for 1Cr17Ni2 or 5CrNiMoV steel ingots, paraffin is arranged on the inner side wall of a cover body shell of an airtight cover, when molten steel flows through the cover body shell, high temperature promotes the combustion of the paraffin for consuming oxygen remained in the cover body shell, and various defects exist: the temperature of molten iron is very high, and when the molten iron passes through paraffin, the paraffin is firstly combusted, then is rapidly melted and is cracked into a gaseous state, and is rapidly and completely changed into gas, so that the molten iron cannot be combusted continuously for a long time, only can play a role of consuming residual oxygen in the airtight cover, and the problem that air outside the cover body shell enters the cover body shell after negative pressure is formed in the middle injection pipe 1 cannot be solved, namely the gas seal effect is poor; and secondly, the paraffin is arranged on the inner wall of the airtight cover, a small amount of impurities inevitably exist in the paraffin, and after the impurities are mixed into molten steel, the impurities directly flow into the die along with the molten steel, so that the quality of the casting is influenced.
Disclosure of Invention
The invention aims to provide a molten steel bottom pouring and pouring pipe component and a pouring method thereof, which can improve the sealing property of a middle pouring pipe, prevent oxygen from entering molten steel in the pouring process, ensure the mechanical property of steel ingots, do not need a complex sealing structure, are convenient and simple to implement and can ensure the pouring efficiency.
The technical scheme adopted by the invention for solving the technical problems is as follows: annotate pipe subassembly in molten steel end notes, including the well notes pipe, the outer wall of well notes pipe upper end mouth is provided with the safety cover, and the inner wall of safety cover is provided with annular pipeline, pipeline and safety cover lateral wall are provided with the venthole, the outer wall of safety cover is provided with the combustible substance.
Further, the combustible is solid alcohol, a circular ring-shaped supporting groove is formed in the bottom of the outer wall of the protective cover, and the solid alcohol is placed in the supporting groove.
Further, the combustible is a ceramic fiber rope soaked by the combustible, and the ceramic fiber rope is wound on the outer wall of the protective cover.
Further, the ceramic fiber rope is wound at the bottom of the outer wall of the protective cover, and the number of winding turns is at least one.
The method for pouring by adopting the molten steel bottom pouring and pouring pipe component comprises the following steps: combustible materials are fixed on the outer wall of the protective cover; introducing argon into the pipeline, discharging the argon into the protective cover from the air hole of the pipeline to form an argon protective layer, igniting combustible, and combusting the combustible to form a flame sealing layer on the outer wall of the protective cover; and finally, casting.
Further, the combustible is a ceramic fiber rope, the ceramic fiber rope is soaked in the combustible, and then the ceramic fiber rope is wound at the bottom of the protective cover.
Further, soaking the ceramic fiber rope in industrial alcohol for at least 30min, then adding a coagulant, and taking out the ceramic fiber rope after the industrial alcohol is converted into solid alcohol.
The invention has the beneficial effects that: the combustible materials are arranged on the outer wall of the protective cover, so that impurities of the combustible materials, impurities generated by combustion and the like cannot be mixed into molten steel, and the purity of the molten steel is kept. The invention adopts the combustible which can be continuously burnt, the combustible is ignited during casting, and oxygen is consumed during burning, so that oxygen nearby the outer part of the protective cover can be consumed, thereby avoiding oxygen from being absorbed by molten steel and ensuring the mechanical property of steel ingots. The invention has the advantages of convenient operation and implementation, cost saving, continuous sealing and good sealing effect.
Drawings
FIG. 1 is a schematic diagram of the prior art;
FIG. 2 is a schematic view of the present invention using a ceramic fiber rope impregnated with a combustible material as the combustible material;
FIG. 3 is a schematic view of the present invention using solid alcohol as a combustible;
reference numerals: 1-pouring tube; 2-a protective cover; 3, a pipeline; 4-argon gas protective layer; 5-combustibles; 6-flame sealing layer; 7-supporting groove.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 2 and 3, the molten steel bottom pouring and middle pouring pipe assembly comprises a middle pouring pipe 1, a protective cover 2 is arranged on the outer wall of an upper port of the middle pouring pipe 1, an annular pipeline 3 is arranged on the inner wall of the protective cover 2, air outlet holes are formed in the side walls of the pipeline 3 and the protective cover 2, and combustible materials 5 are arranged on the outer wall of the protective cover 2.
The middle injection pipe 1, the protective cover 2 and the pipeline 3 can be realized by adopting the prior art. The combustible 5 can be burnt in the air after being ignited, and oxygen in the air needs to be consumed in the burning, so that the oxygen content around the protective cover 2 can be greatly reduced, the oxygen amount sucked by molten steel is reduced, and the mechanical performance of the steel ingot is improved. The combustible 5 is of a structure or material capable of sustained combustion to maintain the seal continuity. The combustible 5 is arranged on the outer wall of the protective cover 2, so that the temperature is lower, the combustible cannot be volatilized or cracked quickly, and the combustible can be combusted continuously for a longer time; meanwhile, impurities in the combustible 5 and impurities in combustion products can be prevented from being mixed into molten steel, and the cleanness of the molten steel and the quality of castings are guaranteed.
The combustible 5 can be various conventional existing fuels, and the combustible 5 is continuously combusted by various means, for example, a circular combustion pipe is arranged on the outer wall of the protective cover 2, a plurality of combustion holes are arranged at the top of the combustion pipe, the distance between the combustion holes is 5cm, natural gas and other gas are continuously introduced into the combustion pipe, and the gas is ignited at the combustion holes, so that flame can be formed, and oxygen can be consumed. For another example, as shown in fig. 3, an annular supporting groove 7 is provided at the bottom of the outer wall of the protective cover 2, and solid alcohol as the combustible 5 is placed in the supporting groove 7, so that the solid alcohol is resistant to high temperature and is not easily volatilized, and a small amount of the solid alcohol can be continuously combusted for a long time.
In addition, as shown in fig. 2, the combustible 5 is a ceramic fiber rope soaked by the combustible, and the ceramic fiber rope is wound on the outer wall of the protective cover 2. The ceramic fiber rope is a ceramic fiber rope, and after the ceramic fiber rope is soaked with the inflammable substances, the inflammable substances are attached to the ceramic fiber rope and can be ignited to form sealed flame. The ceramic fiber rope has the advantage of high temperature resistance, and is not burnt, so that the ceramic fiber rope is not influenced by the high temperature of molten steel, and the burning continuity can be ensured. In addition, the cost of the ceramic fiber rope is very low, the ceramic fiber rope is wound on the outer wall of the protective cover 2 during implementation, the operation is very convenient, one worker can finish the operation within a few minutes, and the safety risk is avoided.
The winding of pottery fine rope is in the bottom of 2 outer walls of safety cover, and the winding number of turns is the round at least, can form annular flame seal circle at the outer wall of safety cover 2 like this when the burning of pottery fine rope, and all-round isolated external oxygen plays better sealed effect.
The method for pouring by the molten steel bottom pouring injection pipe component comprises the following steps:
Argon is introduced into the pipeline 3, the argon is discharged into the protective cover 2 from the air hole of the pipeline 3 to form an argon protective layer 4, then the combustible 5 is ignited, the combustible 5 is combusted, and a flame sealing layer 6 is formed on the outer wall of the protective cover 2. Before casting, argon gas is introduced to exhaust the air remaining in the protective cover 2, thereby preventing the oxygen remaining from oxidizing the molten steel. The argon gas protective layer 4 can prevent external gas from entering molten steel, and greatly reduce the amount of air entering the middle pouring pipe 1. Meanwhile, the flame sealing layer 6 consumes nearby oxygen, so that the oxygen content in the gas is greatly reduced, and the free space between the middle injection pipe 1 and the water gap can be completely sealed under the combined action of the flame sealing layer and the oxygen, so that the quality of the bottom injection steel ingot is effectively improved.
And finally, casting.
The invention can effectively prevent external oxygen from entering molten steel, ensures the quality of steel ingots, is convenient to implement, has low cost and is beneficial to large-scale popularization.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. Annotate subassembly in notes of molten steel bottom, including well notes pipe (1), the outer wall of port is provided with safety cover (2) on well notes pipe (1), and the inner wall of safety cover (2) is provided with annular pipeline (3), pipeline (3) and safety cover (2) lateral wall are provided with venthole, its characterized in that: the outer wall of the protective cover (2) is provided with a combustible material (5).
2. The molten steel pour pipe assembly according to claim 1, wherein: the combustible material (5) is solid alcohol, the bottom of the outer wall of the protective cover (2) is provided with a circular supporting groove (7), and the solid alcohol is placed in the supporting groove (7).
3. The molten steel pour pipe assembly according to claim 1, wherein: the combustible material (5) is a ceramic fiber rope soaked by the combustible material, and the ceramic fiber rope is wound on the outer wall of the protective cover (2).
4. The molten steel pour pipe assembly according to claim 2, wherein: the ceramic fiber rope is wound at the bottom of the outer wall of the protective cover (2), and the number of winding turns is at least one.
5. The method of pouring by using the assembly for a molten steel pouring spout according to claim 1, 2, 3 or 4, comprising: combustible materials (5) are fixed on the outer wall of the protective cover (2); introducing argon into the pipeline (3), discharging the argon into the protective cover (2) from the air hole of the pipeline (3) to form an argon protective layer (4), igniting the combustible (5), combusting the combustible (5) and forming a flame sealing layer (6) on the outer wall of the protective cover (2); and finally, casting.
6. The pouring method of the molten steel bottom pouring spout assembly according to claim 5, wherein: the combustible (5) is a ceramic fiber rope, the ceramic fiber rope is soaked in the combustible, and then the ceramic fiber rope is wound at the bottom of the protective cover (2).
7. The pouring method of the molten steel pouring spout assembly according to claim 6, wherein: soaking the ceramic fiber rope in industrial alcohol for at least 30min, adding a coagulant, and taking out the ceramic fiber rope after the industrial alcohol is converted into solid alcohol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011309182.2A CN112404377A (en) | 2020-11-20 | 2020-11-20 | Molten steel bottom pouring injection pipe assembly and pouring method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011309182.2A CN112404377A (en) | 2020-11-20 | 2020-11-20 | Molten steel bottom pouring injection pipe assembly and pouring method thereof |
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| CN112404377A true CN112404377A (en) | 2021-02-26 |
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| CN202011309182.2A Pending CN112404377A (en) | 2020-11-20 | 2020-11-20 | Molten steel bottom pouring injection pipe assembly and pouring method thereof |
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2020
- 2020-11-20 CN CN202011309182.2A patent/CN112404377A/en active Pending
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Application publication date: 20210226 |
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