CN101428336A - Continuous casting stopper rod-free stream-control protection pouring process for small-square blank - Google Patents
Continuous casting stopper rod-free stream-control protection pouring process for small-square blank Download PDFInfo
- Publication number
- CN101428336A CN101428336A CNA2008102313804A CN200810231380A CN101428336A CN 101428336 A CN101428336 A CN 101428336A CN A2008102313804 A CNA2008102313804 A CN A2008102313804A CN 200810231380 A CN200810231380 A CN 200810231380A CN 101428336 A CN101428336 A CN 101428336A
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- China
- Prior art keywords
- tundish
- casting
- stopper
- continuous casting
- billet
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Abstract
The invention discloses a flow controlling and casting protection process of a billet continuous casting without a stopper, the process is characterized in that a nozzle of a ladle is primarily blocked by an asbestos cord before casting the ladle, and after calcium silicon powder is interposed on the upper side, a tundish is cast by molten steel; a crystallizer is carefully inserted into a submerged nozzle and then rapidly matched with the tundish base to fall down the tundish, and covering slag is pushed in. The invention has the advantages that the stopper is thoroughly thrown through continuous casting; therefore, the accident for the tundish is reduced, the nozzle replacement without rejoining the billet casting is realized, and the rejoining waste billet can be greatly reduced; meanwhile, the temperature of the molten steel in the system is reduced for 10 to 20 DEG C compared with the stopper flow controlling and casting process.
Description
(1) technical field
The invention belongs to technical field of ferrous metallurgy, be specially a kind of little square billet continuous casting process.
(2) background technology
Tundish is an important container in the continuous casting of molten steel technology, and its main effect is the molten steel that storage, buffering, current stabilization and shunting ladle are sent here.Traditional basket pouring mode mainly contains metering nozzle and opens wide cast and stopper control stream and add submersed nozzle and add the covering slag protection and pour into a mould two kinds of technologies.Wherein stopper control stream pouring technology is to move up and down by stopper controlling organization control stopper, realizes opening and closing the mouth of a river and regulates molten steel flow.
In the stopper stream-control protection pouring process; the stopper core will feed the compressed air cooling; because glazed brick quality instability; cause combined plunger control stream accident more, as disconnected rod, close incessantly accident such as bag and take place frequently, and stopper can not realize that long-time control stream pours into a mould; chock plug corrodes and melting loss in the production; can not tightly combine with filling pipe end, casting is run off to control and is caused the overflow steel, and production loss is big.
Stopper control stream must be changed submersed nozzle by cutout pass bag, causes whenever changing the mouth of a river one time, must produce a reclosing base.Adopt stopper control stream because stopper absorbs heat, tundish is forced under the higher degree of superheat and pours into a mould, and has increased the melting loss of anti-the material, has reduced the anti-material life-span, has worsened slab quality.
(3) technology contents
The present invention's purpose is to provide the continuous small-billet casting stopper rod-free stream-control protection pouring process, can promote the continuous casting production development, can improve casting billet surface and internal soundness again, satisfies the needs of new production exploitation.
In order to realize above-mentioned purpose, the present invention is according to following technical scheme.Before steel ladle pouring, blocking the mouth of a river of Baogang with asbestos cord earlier, and after putting into silicon calcium powder in the above, the pouring molten steel tundish; Crystallizer carefully inserts to cooperate bottom middle back stall rapidly behind the submersed nozzle and falls tundish, pushes covering slag.
Superior part of the present invention is: continuous casting is thoroughly thrown stopper away, has reduced the tundish accident, has realized that the replacing mouth of a river do not have reclosing base cast, can significantly reduce the useless base of reclosing, and the simultaneity factor liquid steel temperature reduces 10-20 ℃ than stopper control stream pouring technology.
(4) specific embodiment
The specific embodiment of the present invention is as described below
(1) builds by laying tundish accident pendulum groove;
(2) after tundish is fixed, in brick cup, place filling pipe end, and after adjusting mouth of a river stream spacing and interior outer arc spacing with centralizer tundish is toasted;
(3) block the mouth of a river with asbestos cord, and put into 1 kilogram silicon calcium powder, molten steel is injected tundish, reach the temperature of regulation after, the centre is unwrapped and is watered starting;
(4) submersed nozzle is carefully inserted crystallizer and rapidly with at the bottom of the tundish brick cup in cooperate, fall tundish, push covering slag.
Described accident pendulum tank sheet solder type, the length of determining to put groove according to the distance of crystallizer and accident slag bucket.The rotating shaft of pendulum trench bottom is placed in the commentaries on classics hole of cross rail at the bottom of the intermediate tundish carriage angle about the pendulum groove has 5 to spend with horizontal plane.At pendulum trench bottom tiling one deck refractory brick, under the casting stream or put two-layerly, both sides and inner arc side city refractory brick are tiltedly put before using, will the grains of sand and bath of glass cover on the refractory brick after stirring, and keep building by laying in the pendulum groove of back gradient, be beneficial to molten steel and flow to the slag bucket direction.
Its above tundish stream spacing is controlled at ± 2mm; Tundish upper nozzle and brick cup gap suitable for reading is 3mm, and the end opening gap is 5mm; The accuracy of alignment of tundish upper nozzle is controlled at ± 5mm.The centre unwraps that to water molten steel overheat minimum be 25 ℃.The present invention adopts the straight tubular submersed nozzle of single hole, guarantees mouth of a river insertion depth 50-80mm; Setting up the taper round platform that highly can give prominence to jar end in the brick cup bottom cooperates with submersed nozzle, improve the accuracy of alignment of submersed nozzle, guarantee that simultaneously both cooperate degree of depth 10mm, the submersed nozzle end face apart from jar at the bottom of 20mm, avoid under the accident conditions, the mouth of a river locate cold steel and bottom sheets bonding.
Claims (1)
1, continuous small-billet casting stopper rod-free stream-control protection pouring process is characterized in that blocking the mouth of a river of Baogang with asbestos cord earlier before steel ladle pouring, and after putting into silicon calcium powder in the above, the pouring molten steel tundish; Crystallizer carefully inserts to cooperate bottom middle back stall rapidly behind the submersed nozzle and falls tundish, pushes covering slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102313804A CN101428336A (en) | 2008-12-15 | 2008-12-15 | Continuous casting stopper rod-free stream-control protection pouring process for small-square blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008102313804A CN101428336A (en) | 2008-12-15 | 2008-12-15 | Continuous casting stopper rod-free stream-control protection pouring process for small-square blank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101428336A true CN101428336A (en) | 2009-05-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008102313804A Pending CN101428336A (en) | 2008-12-15 | 2008-12-15 | Continuous casting stopper rod-free stream-control protection pouring process for small-square blank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101428336A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270422A (en) * | 2016-09-20 | 2017-01-04 | 河钢股份有限公司承德分公司 | Improve high-carbon steel continuous casting and open the method watering effect |
| CN108500225A (en) * | 2018-04-28 | 2018-09-07 | 河钢股份有限公司承德分公司 | The method for reducing continuous casting head base bubble |
| CN112808961A (en) * | 2020-12-30 | 2021-05-18 | 河钢股份有限公司承德分公司 | Method for casting continuous casting steel tundish |
-
2008
- 2008-12-15 CN CNA2008102313804A patent/CN101428336A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106270422A (en) * | 2016-09-20 | 2017-01-04 | 河钢股份有限公司承德分公司 | Improve high-carbon steel continuous casting and open the method watering effect |
| CN108500225A (en) * | 2018-04-28 | 2018-09-07 | 河钢股份有限公司承德分公司 | The method for reducing continuous casting head base bubble |
| CN112808961A (en) * | 2020-12-30 | 2021-05-18 | 河钢股份有限公司承德分公司 | Method for casting continuous casting steel tundish |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090513 |