CN115216639A - Production process capable of improving surface quality of electroslag ingot - Google Patents
Production process capable of improving surface quality of electroslag ingot Download PDFInfo
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- CN115216639A CN115216639A CN202210904092.0A CN202210904092A CN115216639A CN 115216639 A CN115216639 A CN 115216639A CN 202210904092 A CN202210904092 A CN 202210904092A CN 115216639 A CN115216639 A CN 115216639A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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Abstract
The invention provides a production process capable of improving the surface quality of an electroslag ingot, which comprises the following steps: s1, baking, namely baking the slag at 680-700 ℃, and baking all auxiliary materials in an oven; s2, power transmission and arc striking, wherein the slag materials are taken out from the oven at the last moment before power transmission and are added immediately by adopting an existing taking mode, and then power transmission and arc striking are carried out in time to reduce the dead time of the slag materials in the air; s3, slagging: the early-stage slag melting time is prolonged, the slag temperature is increased, the sufficient slag melting is ensured, and the degassing effect and the fluidity of the electroslag are ensured; s4, removing oxide skin, namely completely removing the oxide skin layer on the blank to reduce slag inclusion, and completely putting the bottom gasket into an oven; s5, performing dimensional stability control, namely constantly paying attention to the change of the electrical parameters in the control of the operation process and maintaining the stability of the process. After the production process is improved and strengthened, the surface quality of large and small electroslag ingots is good, and the problems of tail gas holes and slag inclusion are obviously improved.
Description
Technical Field
The invention belongs to the technical field of electroslag production, and particularly relates to a production process capable of improving the surface quality of an electroslag ingot.
Background
Electroslag is a secondary refining technology, and integrates a comprehensive metallurgical casting process combining secondary refining of molten steel and directional solidification. The principle is that current passes through liquid slag pool to block heat, metal electrodes are melted, the melted metal is gathered into molten drops, and the molten drops pass through a slag layer to enter a metal molten pool when dropping, and then are crystallized and solidified into steel ingots in a water-cooled crystallizer.
In the prior electroslag production, the problems of air holes and slag inclusion of an electroslag ingot often occur, the surface quality of the electroslag ingot is greatly influenced, the customer satisfaction is reduced, and therefore how to improve the surface quality of the electroslag ingot is very important.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a production process capable of improving the surface quality of an electroslag ingot, which is used for solving the problems of frequent occurrence of pores and slag inclusion of the electroslag ingot.
The invention provides a production process capable of improving the surface quality of an electroslag ingot, which comprises the following steps:
s1, baking, namely baking the slag at 680-700 ℃, and baking all auxiliary materials in an oven;
s2, power transmission and arc striking, wherein the slag materials are taken out at present, each slag material is taken out from the oven at the last moment before power transmission and is added immediately, and then power transmission and arc striking are carried out in time, the voltage is 56V, and the current is 3000A, so that the dead time of the slag materials in the air is reduced;
s3, slagging: the early stage of slag melting time is 35-45 minutes, the slag temperature is increased to 1800-1900 ℃, the early stage of slag melting time is increased, the slag temperature is increased, the sufficient slag melting can be ensured, and the degassing effect and the fluidity of the electroslag are ensured;
s4, removing oxide skin, namely completely removing the oxide skin layer on the blank to reduce slag inclusion;
and S5, maintaining stability control, namely constantly paying attention to the change of the electrical parameters in the control of the operation process and maintaining the stability of the process.
Optionally, the baking temperature of the slag charge in the step S1 is 690 ℃.
Optionally, the early slagging time in step S3 is 40 minutes.
Optionally, the temperature of the slag in step S3 is 1900 ℃.
Optionally, in step S4, all the bottom gaskets are put into an oven, and oil stains and water on the surface are sufficiently removed.
After the production process is improved and strengthened, the electroslag ingot has good surface quality, tail gas holes and slag inclusion problems are obviously improved, and the customer satisfaction is greatly improved.
Drawings
FIG. 1 is a flow chart of a production process for improving the surface quality of an electroslag ingot according to the present invention.
Detailed Description
The present invention is further illustrated by the following examples.
Example 1
In this embodiment, a production process capable of improving the surface quality of an electroslag ingot includes the following steps:
s1, baking, namely baking the slag at 680 ℃, and baking all auxiliary materials in an oven;
s2, power transmission and arc striking, wherein the slag materials are taken out from the oven at the last moment before power transmission and are added immediately by adopting an existing taking mode, and then power transmission and arc striking are carried out in time, wherein the voltage is 56V, and the current is 3000A;
s3, slagging: the early stage slag melting time is 45 minutes, and the slag temperature is increased to 1800 ℃;
s4, removing oxide skin, namely completely removing the oxide skin layer on the blank, putting all the bottom gaskets into an oven, and fully removing oil stains and water on the surface;
and S5, maintaining stability control, namely constantly paying attention to the change of the electrical parameters in the control of the operation process and maintaining the stability of the process.
The electroslag ingot prepared by the embodiment has good surface quality, and tail gas holes and slag inclusion are almost eliminated.
Example 2
In this embodiment, a production process capable of improving surface quality of an electroslag ingot includes the following steps:
s1, baking, namely, baking the slag charge at 690 ℃, and baking all auxiliary materials in an oven;
s2, power transmission and arc striking, wherein the slag materials are taken out at present, each slag material is taken out from the oven at the last moment before power transmission and is added immediately, and then power transmission and arc striking are carried out in time, wherein the voltage is 56V, and the current is 3000A;
s3, slagging: the early slag melting time is 40 minutes, and the slag temperature is increased to 1850 ℃;
s4, removing oxide skin, namely completely removing the oxide skin layer on the blank, putting all the bottom gaskets into an oven, and fully removing oil stains and water on the surface;
and S5, maintaining stability control, namely constantly paying attention to the change of the electrical parameters in the control of the operation process and maintaining the stability of the process.
The electroslag ingot prepared by the embodiment has good surface quality, and the tail part has no air holes and slag inclusion.
Example 3
In this embodiment, a production process capable of improving the surface quality of an electroslag ingot includes the following steps:
s1, baking, namely baking the slag charge at 700 ℃, and baking all auxiliary materials in an oven;
s2, power transmission and arc striking, wherein the slag materials are taken out at present, each slag material is taken out from the oven at the last moment before power transmission and is added immediately, and then power transmission and arc striking are carried out in time, wherein the voltage is 56V, and the current is 3000A;
s3, slagging: the early slag melting time is 35 minutes, and the slag temperature is increased to 1900 ℃;
s4, removing oxide skin, namely completely removing the oxide skin layer on the blank, putting all the bottom gaskets into an oven, and fully removing oil stains and water on the surface;
and S5, maintaining stability control, namely constantly paying attention to the change of the electrical parameters in the control of the operation process and maintaining the stability of the process.
The electroslag ingot prepared by the embodiment has good surface quality, and the tail part has no air holes and slag inclusion.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that the invention be covered by the appended claims without departing from the spirit and scope of the invention.
Claims (5)
1. A production process capable of improving the surface quality of an electroslag ingot is characterized by comprising the following steps:
s1, baking: the baking temperature of the slag charge is 680-700 ℃, and all auxiliary materials are baked in an oven;
s2, power transmission and arcing: the slag materials are taken out from the oven at the last moment before power transmission and then added, and then power is transmitted in time for arc striking, wherein the voltage is 56V, and the current is 3000A;
s3, slagging: the early slag melting time is 35-45 minutes, and the slag temperature is increased to 1800-1900 ℃;
s4, removing oxide scale: completely removing the oxide scale layer on the blank;
s5, stable control: in the control of the operation process, the change of the electrical parameters is noticed at all times, and the stability of the process is maintained.
2. The process according to claim 1, wherein the baking temperature of the slag in step S1 is 690 ℃.
3. The process for producing an electroslag ingot with improved surface quality according to claim 1, wherein the early slagging time in step S3 is 40 minutes.
4. The process for producing an electroslag ingot with improved surface quality as defined in claim 1, wherein the temperature of the slag in step S3 is 1900 ℃.
5. The process according to claim 1, wherein in step S4, the bottom pad is completely placed in the oven to remove oil and moisture from the surface.
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| CN202210904092.0A CN115216639A (en) | 2022-07-29 | 2022-07-29 | Production process capable of improving surface quality of electroslag ingot |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105925916A (en) * | 2016-06-24 | 2016-09-07 | 东北大学 | Method for calcium and aluminum nitrogen increase and deoxygenation in pressurized electroslag remelting process of high-nitrogen steel |
| CN108315563A (en) * | 2017-12-19 | 2018-07-24 | 重庆材料研究院有限公司 | A kind of electroslag remelting slag of super-duplex stainless steel |
| CN109112319A (en) * | 2018-09-18 | 2019-01-01 | 重庆材料研究院有限公司 | Slag charge for nuclear grade stainless steel electroslag remelting and the method using slag charge progress electroslag remelting |
| CN109161697A (en) * | 2018-10-26 | 2019-01-08 | 北京科技大学 | A method of non-metallic inclusion in control powder metallurgy high-temperature alloy master alloy |
| CN113832352A (en) * | 2021-08-16 | 2021-12-24 | 河南中原特钢装备制造有限公司 | Electroslag process for controlling ingot tail defects of electroslag ingot |
| US20220228243A1 (en) * | 2021-01-15 | 2022-07-21 | Northeastern University | Method for produing high nitrogen steel by duplex melting process of pressurized ladle refining and pressurized electroslag remelting |
-
2022
- 2022-07-29 CN CN202210904092.0A patent/CN115216639A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105925916A (en) * | 2016-06-24 | 2016-09-07 | 东北大学 | Method for calcium and aluminum nitrogen increase and deoxygenation in pressurized electroslag remelting process of high-nitrogen steel |
| CN108315563A (en) * | 2017-12-19 | 2018-07-24 | 重庆材料研究院有限公司 | A kind of electroslag remelting slag of super-duplex stainless steel |
| CN109112319A (en) * | 2018-09-18 | 2019-01-01 | 重庆材料研究院有限公司 | Slag charge for nuclear grade stainless steel electroslag remelting and the method using slag charge progress electroslag remelting |
| CN109161697A (en) * | 2018-10-26 | 2019-01-08 | 北京科技大学 | A method of non-metallic inclusion in control powder metallurgy high-temperature alloy master alloy |
| US20220228243A1 (en) * | 2021-01-15 | 2022-07-21 | Northeastern University | Method for produing high nitrogen steel by duplex melting process of pressurized ladle refining and pressurized electroslag remelting |
| CN113832352A (en) * | 2021-08-16 | 2021-12-24 | 河南中原特钢装备制造有限公司 | Electroslag process for controlling ingot tail defects of electroslag ingot |
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