CN113927009A - Method for improving back pressure between quick-change rear plates of submerged nozzle - Google Patents
Method for improving back pressure between quick-change rear plates of submerged nozzle Download PDFInfo
- Publication number
- CN113927009A CN113927009A CN202111004506.6A CN202111004506A CN113927009A CN 113927009 A CN113927009 A CN 113927009A CN 202111004506 A CN202111004506 A CN 202111004506A CN 113927009 A CN113927009 A CN 113927009A
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- plates
- nozzle
- argon
- back pressure
- quick
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention discloses a method for improving back pressure between quick-change back plates of an immersion nozzle, which comprises the following steps: polishing the top of a fixing block of the submerged nozzle quick-change mechanism by using sand paper, and smearing high-temperature-resistant lubricating liquid; controlling the thickness precision and the unevenness of the plate surfaces of the pouring nozzle and the submersed nozzle of the tundish, wherein the total thickness deviation is within +/-0.5 mm, and the gap at the joint of the plate surfaces is less than or equal to 0.1 mm; the tundish upper line is connected with an argon blowing hose, an argon blowing flow switch of the control box plate is opened, the argon flow is set to be 3L/min, an argon outlet hole on the surface of the upper nozzle is blocked, and the pressure is guaranteed to be more than or equal to 0.5 Mp; the operation period of the oil cylinder is within 1 second, otherwise, the operation speed of the oil cylinder is adjusted; before the immersion type water gap is quickly changed, argon gas between plates is closed; when the submerged nozzle is replaced, the casting pulling speed is set to be 0.6-0.8 m/min, the liquid level in the crystallizer is adjusted to be high, and the submerged nozzle is opened after the flow control stopper rod is closed for 4-6 seconds; setting the argon flow between the plates, wherein the back pressure between the plates is more than 0.1Mp, and if the back pressure between the plates is less than 0.1Mp, externally-connected argon is blown into two sides between the plates, and the argon flow is not less than 20L/min.
Description
Technical Field
The invention belongs to the technical field of continuous casting production, and particularly relates to a method for improving back pressure between quick-change back plates of an immersion nozzle.
Background
In continuous casting production, in order to improve the production efficiency and the number of continuous casting furnaces of a tundish, quick replacement of a submerged nozzle is one of the common means. The immersion nozzle and the tundish upper nozzle use argon protection, oxidation and air suction of the plate surface are avoided, but after the immersion nozzle is quickly replaced, the problem that the back pressure between plates is too low is more prominent, and the plate is easily sucked, and oxidation infiltration steel causes the occurrence of advanced shutdown accidents.
Disclosure of Invention
The invention aims to provide a method for improving back pressure between quick-change back plates of a submerged nozzle.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for improving back pressure between quick-change back plates of an immersion nozzle comprises the following steps:
1) polishing the top of a fixing block of the submerged nozzle quick-change mechanism by using sand paper, and smearing high-temperature-resistant lubricating liquid after polishing and smoothing;
2) controlling the thickness precision and the unevenness of the plate surfaces of the pouring nozzle and the submersed nozzle of the tundish, wherein the total thickness deviation is within +/-0.5 mm, and the gap at the joint of the plate surfaces is less than or equal to 0.1 mm;
3) the tundish upper line is connected with an argon blowing hose, an argon blowing flow switch of the control box plate is opened, the argon flow is set to be 3L/min, an argon outlet hole on the surface of the upper nozzle is blocked, and the pressure is guaranteed to be more than or equal to 0.5 Mp;
4) the operation period of the oil cylinder is within 1 second, otherwise, the operation speed of the oil cylinder is adjusted;
5) before the immersion type water gap is quickly changed, argon gas between plates is closed;
6) when the submerged nozzle is replaced, the casting pulling speed is set to be 0.6-0.8 m/min, the liquid level in the crystallizer is adjusted to be high, and the submerged nozzle is opened after the flow control stopper rod is closed for 4-6 seconds;
7) and opening argon gas between the plates, setting the flow rate, enabling the back pressure between the plates to be more than 0.1Mp, and blowing external argon gas at two sides between the plates if the back pressure between the plates is lower than 0.1Mp, wherein the flow rate of the argon gas is not less than 20L/min.
The invention has the following beneficial effects: the method effectively improves the back pressure between the immersion type water gap plates, avoids air suction between the plates and oxidation steel infiltration, and improves the service life and the production efficiency of the tundish.
Detailed Description
The present invention will now be described in further detail.
A method for improving back pressure between quick-change back plates of an immersion nozzle comprises the following steps:
1) the burr at the top of the fixing block of the immersed nozzle quick-change mechanism is cleaned by abrasive paper, no obvious convex-concave feeling is caused by hand feeling, high-temperature-resistant lubricating liquid is smeared after polishing, the lubricating effect is improved, and excessive resistance is caused when the immersed nozzle is prevented from being quickly changed.
2) The thickness precision and the unevenness of the plate surfaces of the pouring nozzle and the submersed nozzle of the tundish are strictly controlled, the total thickness deviation is within +/-0.5 mm, and the plate surface combination gap is within 0.1 mm.
3) After the tundish is connected with the argon blowing hose on line, the argon blowing flow switch between the control box plates is opened, the argon flow is set to be 3L/min, the argon outlet hole on the surface of the upper nozzle is blocked, the display pressure is guaranteed to be more than 0.5Mp, and otherwise, the air leakage reason needs to be searched.
4) And the empty test quick-change mechanism oil cylinder ensures that the operation period of the oil cylinder is within 1 second, otherwise, the operation speed needs to be adjusted.
5) Before the immersion type water gap is quickly changed, argon gas between plates needs to be closed. When the immersion nozzle with qualified baking temperature is required to be replaced and is placed into a quick-change mechanism to replace the slide way, the immersion nozzle is ensured to be placed in the middle, and no obvious deviation can be seen by naked eyes.
6) When the submerged nozzle is replaced, the casting pulling speed is set to be 0.6-0.8 m/min, the liquid level in the crystallizer is controlled according to the high position, the flow control plug rod is closed for 4-6 seconds, and then the nozzle is opened, so that the cutting of molten steel can be effectively reduced, and the steel is prevented from being clamped between plates.
7) Argon gas between the plates is opened, a proper flow rate is set, and the back pressure between the plates can be kept above 0.1 Mp.
8) If the back pressure between the plates is lower than 0.1Mp, external argon is required to be blown into the two sides of the plates, the flow of the external argon is not less than 20L/min, and the plate surface oxidation corrosion caused by air suction is avoided.
Through adopting above operation mode, can effectively improve immersion nozzle quick change back interplate backpressure, avoid the interplate to press from both sides reasons such as steel and cause the problem of inhaled air, oxidation scurry the steel, improve middle package life, have fine spreading value.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (1)
1. A method for improving back pressure between quick-change back plates of an immersion nozzle is characterized by comprising the following steps:
1) polishing the top of a fixing block of the submerged nozzle quick-change mechanism by using sand paper, and smearing high-temperature-resistant lubricating liquid after polishing and smoothing;
2) controlling the thickness precision and the unevenness of the plate surfaces of the pouring nozzle and the submersed nozzle of the tundish, wherein the total thickness deviation is within +/-0.5 mm, and the gap at the joint of the plate surfaces is less than or equal to 0.1 mm;
3) the tundish upper line is connected with an argon blowing hose, an argon blowing flow switch of the control box plate is opened, the argon flow is set to be 3L/min, an argon outlet hole on the surface of the upper nozzle is blocked, and the pressure is guaranteed to be more than or equal to 0.5 Mp;
4) the operation period of the oil cylinder is within 1 second, otherwise, the operation speed of the oil cylinder is adjusted;
5) before the immersion type water gap is quickly changed, argon gas between plates is closed;
6) when the submerged nozzle is replaced, the casting pulling speed is set to be 0.6-0.8 m/min, the liquid level in the crystallizer is adjusted to be high, and the submerged nozzle is opened after the flow control stopper rod is closed for 4-6 seconds;
7) and opening argon gas between the plates, setting the flow rate, enabling the back pressure between the plates to be more than 0.1Mp, and blowing external argon gas at two sides between the plates if the back pressure between the plates is lower than 0.1Mp, wherein the flow rate of the argon gas is not less than 20L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111004506.6A CN113927009A (en) | 2021-08-30 | 2021-08-30 | Method for improving back pressure between quick-change rear plates of submerged nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111004506.6A CN113927009A (en) | 2021-08-30 | 2021-08-30 | Method for improving back pressure between quick-change rear plates of submerged nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113927009A true CN113927009A (en) | 2022-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111004506.6A Pending CN113927009A (en) | 2021-08-30 | 2021-08-30 | Method for improving back pressure between quick-change rear plates of submerged nozzle |
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| CN (1) | CN113927009A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115921844A (en) * | 2022-11-15 | 2023-04-07 | 重庆钢铁股份有限公司 | Method for preventing air suction between quick change mechanism plates during nozzle replacement of slab caster |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002120051A (en) * | 2000-10-13 | 2002-04-23 | Sumitomo Heavy Industries Himatex Co Ltd | Device for exchanging immersion nozzle in continuous caster |
| JP2012148336A (en) * | 2010-12-27 | 2012-08-09 | Jfe Steel Corp | Method for predicting and detecting defect in cast slab, method for manufacturing the cast slab, device for predicting and detecting defect in the cast slab, and continuous casting apparatus having the device for predicting and detecting defect in the cast slab |
| JP2013039590A (en) * | 2011-08-15 | 2013-02-28 | Nippon Steel & Sumitomo Metal Corp | Immersion nozzle and continuous casting method of steel using the same |
| JP2015016499A (en) * | 2013-07-12 | 2015-01-29 | Ｊｆｅスチール株式会社 | Steel continuous casting method |
| CN111390130A (en) * | 2020-04-26 | 2020-07-10 | 山东钢铁集团日照有限公司 | Method for controlling subcutaneous pinhole bubbles of medium-carbon boron-added steel continuous casting billet |
| CN113042726A (en) * | 2021-03-11 | 2021-06-29 | 天津市新天钢钢铁集团有限公司 | Method for treating steel channeling between slab continuous casting quick-change water gap plates |
-
2021
- 2021-08-30 CN CN202111004506.6A patent/CN113927009A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002120051A (en) * | 2000-10-13 | 2002-04-23 | Sumitomo Heavy Industries Himatex Co Ltd | Device for exchanging immersion nozzle in continuous caster |
| JP2012148336A (en) * | 2010-12-27 | 2012-08-09 | Jfe Steel Corp | Method for predicting and detecting defect in cast slab, method for manufacturing the cast slab, device for predicting and detecting defect in the cast slab, and continuous casting apparatus having the device for predicting and detecting defect in the cast slab |
| JP2013039590A (en) * | 2011-08-15 | 2013-02-28 | Nippon Steel & Sumitomo Metal Corp | Immersion nozzle and continuous casting method of steel using the same |
| JP2015016499A (en) * | 2013-07-12 | 2015-01-29 | Ｊｆｅスチール株式会社 | Steel continuous casting method |
| CN111390130A (en) * | 2020-04-26 | 2020-07-10 | 山东钢铁集团日照有限公司 | Method for controlling subcutaneous pinhole bubbles of medium-carbon boron-added steel continuous casting billet |
| CN113042726A (en) * | 2021-03-11 | 2021-06-29 | 天津市新天钢钢铁集团有限公司 | Method for treating steel channeling between slab continuous casting quick-change water gap plates |
Non-Patent Citations (2)
| Title |
|---|
| 朱明伟: "快换水口过程板坯质量的改进措施", 《连铸》 * |
| 焦泽等: "如何防止浇注过程中快换水口的板面氧化", 《第十七届（2013年）全国炼钢学术会议论文集（A卷）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115921844A (en) * | 2022-11-15 | 2023-04-07 | 重庆钢铁股份有限公司 | Method for preventing air suction between quick change mechanism plates during nozzle replacement of slab caster |
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Application publication date: 20220114 |
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