CN1223918A - Immersed X-gate capable of making molten steel in mould spin - Google Patents
Immersed X-gate capable of making molten steel in mould spin Download PDFInfo
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- CN1223918A CN1223918A CN 99101507 CN99101507A CN1223918A CN 1223918 A CN1223918 A CN 1223918A CN 99101507 CN99101507 CN 99101507 CN 99101507 A CN99101507 A CN 99101507A CN 1223918 A CN1223918 A CN 1223918A
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Abstract
A X-shaped immersible gate able to make molten steel spin by itself in mould for continuous casting features that it has two equicrossed semi-ellipse guide plates in the lower part of reversely conic-cylindrical cavity to form two spiral guide channels in the space limited by reversely conic-cylindrical cavity and the guide plates that has an included angle relative to liquid level of 25-45 degrees. Its advantages are novel structure, low cost, high performance and stirring function in mould.
Description
The invention belongs to the continuous casting technology field.
Along with the maturation day by day of continuous casting technology, high-efficient continuous casting technology has become world today's steel industry hot research problem.High-efficient continuous casting technology is to be core with high pulling rate, based on the production of high-quality zero defect continuous casting billet, realizes the high systems technology of watering rate, high operating rate continuous casting that connects.Because it is than conventional continuous casting production efficiency height, so each industrial country of the world competitively invests and develops this technology.The world-renowned Ferrous Metallurgy device fabrication SMS of company, CONCAST, DANIELI, V EST etc. have successively released the high efficiency continuous casting crystallizer of oneself, and casting speed has almost turned over some.
Yet, raising along with casting speed, inject molten steel flow speed and all significantly increases of flow of crystallizer by immersing the mouth of a river, improperly will cause that meniscus place liquid fluctuating is violent, impact depth is deepened, the field trash bubble is difficult for come-up if control, bring defectives such as volume slag, crackle, so how to improve the cleannes of molten steel, become one of problem of being concerned about the most in the continuous casting production.The type of flow of molten steel in mold and the state not only behavioral implications to field trash are very big, and to the formation of early solidification solidified shell and the very big influence of generation of conducting heat, so can control the electromagnetic brake technology of MOLTEN STEEL FLOW state and can improve cc billet surface quality and interior tissue, the electromagnetic agitating technology that is beneficial to inclusion floating is widely adopted.
Since the electromagnetic agitation patent disclosure of nineteen fifty Janghans, people have carried out a large amount of research from being tested to use.Its application has been one of most important achievement in the continuous casting technology since the seventies, is acknowledged as and can improves the state-of-the-art technology that continuous casting billet structure is beneficial to inclusion floating.Its advantage is: (one) impels gas to separate out owing to the rotation of molten steel in mold, wash away the inner surface of scull, and the molten steel cleaning causes field trash, center segregation to alleviate, and the dendritic arm that fractures increases the equiax crystal district, improved continuous casting billet structure; (2) can improve pouring temperature, solve the nozzle blocking problem,, also generate equiax crystal easily even molten steel overheat is big; (3) improve the inhomogeneities of casting blank surface temperature and scull, controlled the compactness and the size shape of base shell, make defectives such as surface pinholes, rimhole, slag inclusion, chink, skull patch improve greatly or eliminate.But the practice of using electromagnetic agitation in the crystallizer in recent years shows, adopts under the condition of submersed nozzle and covering slag cast, and using conventional crystallizer to stir also has some defectives.For example: because the shielding action and the electromagnetism gap of crystallizer copper wall, the electromagnetic energy that the crystallizer magnetic stirrer sends has only sub-fraction to convert the kinetic energy of molten steel to, and the magnetic stirrer power consumption is big, cost is high, installation is difficult; Under strong rotating condition, mind-set wall protuberance (center is low, the wall height) in the molten steel at meniscus place, and covering slag is thickened to the center by wall, it is irregular to cause covering slag to be sprawled, and easily is stripped from and entrainments; Strong rotation is stirred and is caused negative segregation easily, and molten mold flux seriously corrodes the mouth of a river simultaneously, influences service life.
In the prior art, the mouth of a river kind that offers production application is a lot, two sided is arranged to the mouth of a river, the tubaeform mouth of a river, the ox muzzle mouth of a river, flat mouth of a river or the like.But these mouths of a river do not have the function that molten steel in the crystallization of making produces rotational flow, and the movement disorder of molten steel in crystallization directly has influence on the quality of continuous casting billet.Therefore people make every effort to change the flow regime of molten steel in mold at the submersed nozzle reasonable in design of trying every possible means.For example: when using circular-arc type continuous casting machine, on the intrados of strand, assembling field trash, the gathering of this field trash is owing to the sinking that steel flow caused that flows out from mouth of a river steel outlet hole takes place in that this position is more weak, the rugged steel plant of Buddhist nun are when continuous casting 240 * 240mm square billet, leave the steel outlet hole of an inclination at the bottom of the submersed nozzle, because the effect of this inclination steel outlet hole is strengthened the molten steel sinking of strand inner arc part, thereby improved the coherent condition of field trash.In order to adapt to sheet blank continuous casting, Thyssen Aktiengesellschaft's chamber water model is by experiment studied, and proposing a kind of appearance and size is 75 * 100mm, and wall thickness is the submersed nozzle of 17.5mm, and the horizontal side of two side holes is 20 * 50mm, 20 ° of positive pitches.In use find, when molten steel flows out from submersed nozzle, produce strong jet phenomenon to leptoprosopy, cause on the crystallizer copper wall and agglutinate, above the submersed nozzle molten steel outlet, set up the anti-plate washer that sprays of " V " shape afterwards, molten steel no longer splashes on the crystallizer copper wall, has improved operating condition.
In a word, in the prior art,, need to be equipped with electromagnetic mixing apparatus, not only consume a large amount of energy, but also will increase equipment investment in order to improve the quality of continuous casting billet.
Molten steel flows into crystallizer by submersed nozzle from tundish, can not only regard it as one prevent that molten steel from contacting the guiding device of (anti-oxidation) with air, it plays a part control molten steel flow regime and temperature field in crystallizer in casting process, affect distribution, volume slag and liquid level stable of field trash in the molten steel, also affect the formation of early solidification solidified shell.It is subjected to poring rate, mouth of a river shape, many-sided factor affecting such as outlet inclination angle, immersion depth and crystallizer internal cavity structure, wherein the structure of gate structure, especially exit portion most importantly.
The object of the present invention is to provide a kind of " X " shape submersed nozzle that can make the molten steel in mold spinning, this gate structure novelty, cost are low, performance is good, its biggest advantage is that the molten steel spin that the kinetic energy that relies on molten steel itself to have drives in the crystallizer changes, function with electromagnetic agitation in the crystallizer, reduce equipment investment, save energy consumption.
This " X " shape submersed nozzle that can make the molten steel in mold spinning, it is characterized in that: the two half elliptic deflectors (2,3) that intersect are set in the bottom of back taper cylinder (1) inner chamber etc., by back taper cylinder bore (1) and etc. the space that last lower plane surrounded of two half elliptic deflectors of intersection (2,3), form two smooth spirality flow-guiding channels, two half elliptic deflectors (2,3) equate to be α with the angle of liquid level, the angle of α is 25 °-45 °, and this mouth of a river can be by the one-shot forming of isometrical pressure drawing method.
Drawings and Examples: Fig. 1, can make the molten steel in mold spinning " X " shape submersed nozzle structure chart Fig. 2, can make the molten steel in mold spinning " X " shape submersed nozzle inner-cavity structure figure Fig. 3, can make when " X " shape submersed nozzle of molten steel in mold spinning is local to amplify three-view diagram Fig. 4, circle base, square billet, rectangular bloom, slab and shaped blank continuous casting, mouth of a river rotation direction is arranged schematic diagram
Accompanying drawing 1 is disclosed to be one embodiment of the present of invention (seeing Fig. 1, Fig. 2, Fig. 3), refractory material and bonding agent are mixed, pack in the mould of forming by last internal mold, core insert and external mold, by the compacting of isometrical pressure, make back taper cylinder and etc. two half elliptic deflectors (i.e. " X " shape) of intersection be pressed into overall structure.It is rational in infrastructure reliable, and globality is strong.By the back taper cylinder bore and etc. formed two the spirality flow-guiding channels in space that lower plane surrounds on two half elliptic deflectors of intersection, can make the molten steel helical flow.Flow out the molten steel that enters in the crystallizer from the spiral stream guidance passage and have rotational flow kinetic energy from start to finish, so the molten steel that flows out from two spiral stream guidance passages during direct casting continuously offers molten steel in the crystallizer to rotational flow kinetic energy, drives the molten steel in mold rotation.Stablizing under the casting situation, molten steel injects crystallizer continuously, and the molten steel in the crystallizer is in the stable rotation state.Consider the viscous damping of molten steel, this mouth of a river outlet near zone rotary speed height, the distance outlet is low than territory, far field molten steel rotary speed.In the higher zone of rotary speed-whirlpool district, owing to the effect of centripetal force, field trash, bubble are assembled and rapid come-up to center of vorticity, and protected afterwards slag adsorbs, or pulls out with mechanical system; In the lower zone of rotary speed---weak stirring area, the moulding of molten steel scull can not cause strong agitation and produces negative segregation.The rotation of the molten steel dendritic arm that fractures increases the equiax crystal district and improves solidified structure, alleviates center segregation effectively.
The electromagnetic agitation continuous casting is the same in this submersed nozzle syncrystallization device disclosed by the invention, and the rectangular billet caster that is suitable for justifying base, square billet most or approaches square billet also can be carried out the cast of many mouths of a river to heavy slab and shaped blank.When the cast of many mouths of a river, should note the layout (see figure 4) of mouth of a river direction of rotation
This " X " shape submersed nozzle of molten steel in mold spinning that can make has following advantage:
1, " X " shape submersed nozzle relies on the original kinetic energy that has of molten steel, by two The spirality water conservancy diversion that the upper and lower plane of half elliptic deflector and back taper cylinder bore surround The guide effect of passage makes the molten steel rotation in the crystallizer, and comparing with electromagnetic agitation does not have energy The source consumes, and wants to accelerate the rotary speed of molten steel, as long as raise position or the increase of tundish The Metal in Tundish liquid level, the mobile potential energy that strengthens molten steel gets final product.
2, because whirlpool district molten steel rotary speed height, be beneficial to field trash, bubble coalescence and rise floatingly, weak stirring area rotary speed is low, is beneficial to scull and forms, and does not compare with electromagnetic agitation to cause negative segregation.
3, because " X " shape deflector converts the perpendicular flow of molten steel to screw, suppress the impact depth of beam effectively, helped the come-up of field trash, bubble and the formation of scull.
4, because submersed nozzle itself will use as the guiding device of protection molten steel secondary oxidation,, invest one of little its percentage of deficiency so compare with the great number investment of electromagnetic agitation.
5, the same with electromagnetic agitation, the rotation of the molten steel dendritic arm that fractures increases the equiax crystal district and improves solidified structure, alleviates center segregation effectively.
Claims (2)
1, a kind of " X " shape submersed nozzle that can make molten steel spin commentaries on classics in the crystallization, it is characterized in that: bottom in back taper cylinder bore (1), the two half elliptic deflectors (2,3) that intersect are set etc., by back taper cylinder bore (1) and etc. the space that last lower plane surrounded of two half elliptic deflectors of intersection (2,3), form two smooth spirality flow-guiding channels, two oval deflectors equate to be α with the angle of liquid level, and the angle of α is 25 °-45 °.
2, according to claim 1 described " X " shape submersed nozzle, it is characterized in that: this mouth of a river can be with the moulding of isometrical pressure drawing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99101507A CN1070093C (en) | 1999-01-01 | 1999-01-01 | Immersed X-gate capable of making molten steel in mould spin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99101507A CN1070093C (en) | 1999-01-01 | 1999-01-01 | Immersed X-gate capable of making molten steel in mould spin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1223918A true CN1223918A (en) | 1999-07-28 |
| CN1070093C CN1070093C (en) | 2001-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99101507A Expired - Fee Related CN1070093C (en) | 1999-01-01 | 1999-01-01 | Immersed X-gate capable of making molten steel in mould spin |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847422A (en) * | 2011-07-22 | 2013-01-02 | 上海克硫环保科技股份有限公司 | Apparatus for desulfurizing smoke through ammonia process |
| CN104878214A (en) * | 2015-05-14 | 2015-09-02 | 浙江天马轴承有限公司 | Electro slag ingot casting device adopting molten steel shunt and gas protection |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2108596U (en) * | 1991-10-31 | 1992-07-01 | 冶金工业部钢铁研究总院 | Special type immersion gate |
| CN2126624Y (en) * | 1992-06-05 | 1993-01-27 | 冶金工业部钢铁研究总院 | Special gate for continuous casting of sheet bar |
| CN2171434Y (en) * | 1993-07-08 | 1994-07-13 | 冶金工业部钢铁研究总院 | Compound soaking water gap |
| CN2231585Y (en) * | 1995-05-21 | 1996-07-24 | 沁阳市耐火材料厂 | Composite upper runner for continuous casting ladle |
-
1999
- 1999-01-01 CN CN99101507A patent/CN1070093C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102847422A (en) * | 2011-07-22 | 2013-01-02 | 上海克硫环保科技股份有限公司 | Apparatus for desulfurizing smoke through ammonia process |
| CN102847422B (en) * | 2011-07-22 | 2015-06-17 | 上海克硫环保科技股份有限公司 | Apparatus for desulfurizing smoke through ammonia process |
| CN104878214A (en) * | 2015-05-14 | 2015-09-02 | 浙江天马轴承有限公司 | Electro slag ingot casting device adopting molten steel shunt and gas protection |
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| Publication number | Publication date |
|---|---|
| CN1070093C (en) | 2001-08-29 |
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