CN112296324A - Method for prolonging service life of 400-series stainless steel continuous casting submerged nozzle - Google Patents
Method for prolonging service life of 400-series stainless steel continuous casting submerged nozzle Download PDFInfo
- Publication number
- CN112296324A CN112296324A CN202011082463.9A CN202011082463A CN112296324A CN 112296324 A CN112296324 A CN 112296324A CN 202011082463 A CN202011082463 A CN 202011082463A CN 112296324 A CN112296324 A CN 112296324A
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- China
- Prior art keywords
- submerged nozzle
- continuous casting
- stainless steel
- slag
- series stainless
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/505—Rings, inserts or other means preventing external nozzle erosion by the slag
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a method for prolonging the service life of a 400-series stainless steel continuous casting submerged nozzle, which comprises the following steps: s1, thickening the slag line part of the submerged nozzle; s2, pouring by adopting an immersion type water gap, wherein in the pouring process, the immersion type water gap is used for 4 hours and then is subjected to slag line replacement operation, the adjustment range of the slag line replacement is 15mm, the thickness of a liquid slag layer on the liquid surface of the crystallizer is controlled to be 10-12 mm, and the fluctuation of the liquid surface is +/-2 mm. The invention has the advantages that: can improve the production efficiency and reduce the production cost.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for prolonging the service life of a 400-series stainless steel continuous casting submerged nozzle.
Background
In the production and continuous casting process of 400 series stainless steel, because of the influence of the service life of a submerged nozzle, the number of continuous casting furnaces is generally below 10, the improvement of the stainless steel yield is limited, and the improvement of the production efficiency is hindered. The number of continuous casting furnaces is low, the blank head and tail amount of the blank and the ladle casting allowance are increased, and the metal yield of the stainless steel is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for prolonging the service life of a 400-series stainless steel continuous casting submerged nozzle, which can improve the production efficiency and reduce the production cost.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method for prolonging the service life of a 400 series stainless steel continuous casting submerged nozzle comprises the following steps:
s1, thickening the slag line part of the submerged nozzle;
s2, pouring by adopting an immersion type water gap, wherein in the pouring process, the immersion type water gap is used for 4 hours and then is subjected to slag line replacement operation, the adjustment range of the slag line replacement is 15mm, the thickness of a liquid slag layer on the liquid surface of the crystallizer is controlled to be 10-12 mm, and the fluctuation of the liquid surface is +/-2 mm.
Furthermore, the submerged nozzle slag line part is thickened by 10mm, the material of the thickened part is the same as that of the raw water opening, and the water opening is baked for 3 hours.
Further, the adjustment mode of the submerged nozzle slag line in the step S2 is that the submerged nozzle slag line is adjusted from deep to shallow, the adjustment amplitude is 15mm, and the adjustment time is more than 2 minutes.
Further, when the slag line is replaced in the step S2, the constant speed is adjusted, the liquid level of the crystallizer is automatically controlled, the vibration amplitude is +/-2 mm, the thickness of a liquid slag layer of the crystallizer is controlled to be 10-12 mm, and the sum of the thickness of the liquid slag layer of the crystallizer and the fluctuation distance of the liquid level is smaller than 15 mm.
Compared with the prior art, the invention has the advantages that: the method for prolonging the service life of the 400 series stainless steel continuous casting submerged nozzle improves the number of continuous casting furnaces of the 400 series stainless steel and improves the production efficiency; after the number of continuous casting furnaces is increased, the number of the casting residues of the tundish and the number of the head and the tail of the blank are reduced, and the production cost is reduced.
Drawings
FIG. 1 is a sectional view of a submerged entry nozzle used in a method for improving the life span of a 400-series stainless steel continuous casting submerged entry nozzle according to the present invention.
Detailed Description
Examples
Pouring steel grade 10Cr17, wherein continuous casting molten steel is supplied by an LF furnace, the components of the molten steel are controlled within a standard range, and the pouring superheat degree is controlled according to 15-20 ℃, and the specific method comprises the following steps:
adding a coarse water gap at the slag line and the part below the slag line, baking the water gap for 3 hours at the temperature of over 1000 ℃, and installing before pouring;
after the casting is started, the insertion depth of a water gap is adjusted to 150mm, the pulling speed is controlled according to 1.1m/min, the liquid level is automatically controlled, and the liquid level of a crystallizer is controlled to be +/-2 mm;
measuring the thickness of the liquid slag layer, and controlling the thickness of the liquid slag layer to be 10-12 mm;
pouring the 8 th ladle of molten steel for 20 minutes, and adjusting the slag line of the submerged nozzle in the whole pouring time of 4 hours and 10 minutes from deep to shallow, wherein the adjusting time is 2 minutes, and the adjusting amplitude is 15 mm;
and finishing the casting operation after the 17-ladle molten steel is cast in the casting process.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (4)
1. A method for prolonging the service life of a 400-series stainless steel continuous casting submerged nozzle is characterized by comprising the following steps:
s1, thickening the slag line part of the submerged nozzle;
s2, pouring by adopting an immersion type water gap, wherein in the pouring process, the immersion type water gap is used for 4 hours and then is subjected to slag line replacement operation, the adjustment range of the slag line replacement is 15mm, the thickness of a liquid slag layer on the liquid surface of the crystallizer is controlled to be 10-12 mm, and the fluctuation of the liquid surface is +/-2 mm.
2. The method of claim 1, wherein the life of the 400-series stainless steel continuous casting submerged nozzle is prolonged by: the submerged nozzle slag line part is thickened by 10mm, the material of the thickened part is the same as that of the raw water opening, and the water opening is baked for 3 hours.
3. The method of claim 1, wherein the life of the 400-series stainless steel continuous casting submerged nozzle is prolonged by: and the adjustment mode of the submerged nozzle slag line in the S2 is that the slag line is adjusted from deep to shallow, the adjustment amplitude is 15mm, and the adjustment time is more than 2 minutes.
4. The method of claim 1, wherein the life of the 400-series stainless steel continuous casting submerged nozzle is prolonged by: and when the slag binding line is replaced in the S2, the constant speed is adjusted, the liquid level of the crystallizer is automatically controlled, the vibration amplitude is +/-2 mm, the thickness of a liquid slag layer of the crystallizer is controlled to be 10-12 mm, and the sum of the thickness of the liquid slag layer of the crystallizer and the fluctuation distance of the liquid level is less than 15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011082463.9A CN112296324A (en) | 2020-10-12 | 2020-10-12 | Method for prolonging service life of 400-series stainless steel continuous casting submerged nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011082463.9A CN112296324A (en) | 2020-10-12 | 2020-10-12 | Method for prolonging service life of 400-series stainless steel continuous casting submerged nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112296324A true CN112296324A (en) | 2021-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011082463.9A Pending CN112296324A (en) | 2020-10-12 | 2020-10-12 | Method for prolonging service life of 400-series stainless steel continuous casting submerged nozzle |
Country Status (1)
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| CN (1) | CN112296324A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341622A (en) * | 2013-06-26 | 2013-10-09 | 攀钢集团攀枝花钢钒有限公司 | Method for prolonging service life of continuous casting immersion type water opening |
| CN104084551A (en) * | 2014-07-30 | 2014-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for controlling continuous casting tundish submersed nozzle |
| CN205496560U (en) * | 2016-01-29 | 2016-08-24 | 宝山钢铁股份有限公司 | Prevent bias flow immersion nozzle structure |
| CN207127252U (en) * | 2017-08-01 | 2018-03-23 | 山东工业职业学院 | A kind of Novel continuous casting crystallizer submersed nozzle |
| CN210632916U (en) * | 2019-06-21 | 2020-05-29 | 邯郸钢铁集团有限责任公司 | Automatic immersion depth adjusting system for tundish submersed nozzle |
-
2020
- 2020-10-12 CN CN202011082463.9A patent/CN112296324A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103341622A (en) * | 2013-06-26 | 2013-10-09 | 攀钢集团攀枝花钢钒有限公司 | Method for prolonging service life of continuous casting immersion type water opening |
| CN104084551A (en) * | 2014-07-30 | 2014-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for controlling continuous casting tundish submersed nozzle |
| CN205496560U (en) * | 2016-01-29 | 2016-08-24 | 宝山钢铁股份有限公司 | Prevent bias flow immersion nozzle structure |
| CN207127252U (en) * | 2017-08-01 | 2018-03-23 | 山东工业职业学院 | A kind of Novel continuous casting crystallizer submersed nozzle |
| CN210632916U (en) * | 2019-06-21 | 2020-05-29 | 邯郸钢铁集团有限责任公司 | Automatic immersion depth adjusting system for tundish submersed nozzle |
Non-Patent Citations (1)
| Title |
|---|
| 张艳霞等: "板坯连铸浸入式水口三段式变渣线工艺探讨及应用", 《第十七届（2013年）全国炼钢学术会议论文集(A卷)》 * |
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Application publication date: 20210202 |