JPH0128931Y2 - - Google Patents
Info
- Publication number
- JPH0128931Y2 JPH0128931Y2 JP6232985U JP6232985U JPH0128931Y2 JP H0128931 Y2 JPH0128931 Y2 JP H0128931Y2 JP 6232985 U JP6232985 U JP 6232985U JP 6232985 U JP6232985 U JP 6232985U JP H0128931 Y2 JPH0128931 Y2 JP H0128931Y2
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- tundish
- inclusions
- gas
- shaft body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 41
- 239000010959 steel Substances 0.000 claims description 41
- 239000011261 inert gas Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 17
- 238000007664 blowing Methods 0.000 description 10
- 238000007667 floating Methods 0.000 description 8
- 239000002893 slag Substances 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000013019 agitation Methods 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は連続鋳造におけるタンデイツシユ内溶
鋼の介在物の浮上除去装置に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for floating and removing inclusions in molten steel in a tundish in continuous casting.
一般に転炉、電気炉等の精錬炉で溶製されて後
に、取鍋に出湯されつつ脱酸、成分調整された溶
鋼内にはかなりの非金属介在物が混入されてい
る。この非金属介在物はタンデイツシユ等を介し
てスラブ、ブルーム等に鋳造する際に該鋳片内に
捕捉凝固して鋼材の品質を阻害することも知られ
ている。
In general, molten steel is melted in a refining furnace such as a converter or an electric furnace, and then deoxidized and compositionally adjusted while being tapped into a ladle, and a considerable amount of nonmetallic inclusions are mixed in. It is also known that these non-metallic inclusions are trapped and solidified in the slab when cast into slabs, blooms, etc. through a tundish, etc., and impair the quality of the steel material.
このように溶鋼中の非金属介在物の捕捉による
鋼材の品質阻害を防止する手段の一例として連続
鋳造の際にタンデイツシユ内で該非金属介在物を
分離除去することが行なわれており、その手段も
数多く提案されている。この分離除去手段として
は例えば特開昭58−68456号公報の如く、タンデ
イツシユの底部に通気性耐火物を埋設して溶鋼流
と直角の方向にガスを吹込み介在物を浮上除去す
る（以下ポーラスプラグのガス吹込みと称する）
か、あるいは実開昭56−78863号公報、実開昭58
−4647号公報等に示すように軸内部にフラキシン
グガスの通路を形成して、該軸先端部に撹拌羽
根、あるいは水平定盤を設けたフラキシングガス
の微細気泡を吹込む装置（以下単に総称して回転
羽根吹込みと称する）等がある。 As an example of a method for preventing the quality of steel products from being impaired due to the capture of non-metallic inclusions in molten steel, such non-metallic inclusions are separated and removed in the tundish during continuous casting. Many proposals have been made. As disclosed in Japanese Patent Application Laid-open No. 58-68456, for example, a permeable refractory is buried in the bottom of the tundish, and gas is blown in a direction perpendicular to the molten steel flow to float and remove the inclusions (hereinafter referred to as "porous"). (referred to as plug gas injection)
Or, Utility Model Application Publication No. 1978-78863, Utility Model Application No. 1983
As shown in Publication No. 4647, etc., a device (hereinafter simply referred to as "fluxing gas") that blows fine bubbles of fluxing gas by forming a fluxing gas passage inside the shaft and providing a stirring blade or a horizontal surface plate at the tip of the shaft. (collectively referred to as rotary blade blowing).
しかしながらこれ等従来の介在物の除去装置は
以下に述べる理由から十分とは言い難い。 However, these conventional inclusion removal devices cannot be said to be sufficient for the reasons described below.
まず、タンデイツシユにおけるポーラスプラグ
のガス吹込みは、均一な微細気泡の供給を安定し
て得ることが出来ない。さらに溶鋼の浴面下に敷
設するポーラスプラグの長手、あるいは巾方向の
不活性ガス流も不均一となり易く、十分な吹込み
ガス量の確保ができずこれに伴う撹拌の強弱が表
層面の介在物巻き込み等を誘発する。 First, gas blowing using a porous plug in a tundish cannot stably supply a uniform supply of fine bubbles. Furthermore, the flow of inert gas in the longitudinal or width direction of the porous plug placed under the bath surface of molten steel tends to be uneven, making it impossible to secure a sufficient amount of blown gas, and the strength of the agitation associated with this may be affected by the intervening strength of the surface layer. Causing objects to become entangled.
一方、回転羽根吹込みはタンデイツシユの溶鋼
浴面上から該回転羽根を浸漬して回動するため
に、浴面の揺動が発生して逆に浮遊したスラグの
巻込み、あるいは一度浮上した介在物の巻込みを
生ずる。 On the other hand, in the case of rotary blade blowing, since the rotary blade is immersed above the molten steel bath surface of the tundish and rotated, the bath surface vibrates, causing floating slag to be drawn in or particles that have once floated to the surface. Causes objects to become entangled.
さらにまた、溶鋼の鋳造時におけるタンデイツ
シユ内は浮遊スラグで被覆するかあるいはアルゴ
ンガスシール等により溶鋼の空気酸化を防止して
いるが浴面の揺動により浮遊スラグが押しのけら
れ空気酸化を招き結果として鋼中の介在物が増加
するか、あるいはアルゴンガスシールにおいても
回動体を挿着することから容易でない等の欠点を
有している。 Furthermore, when casting molten steel, the inside of the tandate is covered with floating slag or sealed with argon gas to prevent air oxidation of the molten steel, but the floating slag is pushed away by the shaking of the bath surface, resulting in air oxidation. This method has drawbacks such as an increase in inclusions in the steel, and the fact that it is not easy to insert a rotating body even in an argon gas seal.
本考案は、前述した如き従来法の欠点である均
一な微細気泡でもつて、しかも所定ガス量の吹込
みを安定して行なうことによつて溶鋼中の介在物
の浮上除去を確実に行なう。また、介在物の浮上
除去の際に浴面の揺動を抑制して介在物の巻き込
み、あるいは空気酸化を防止して溶鋼の品質を大
巾に向上するタンデイツシユの内溶鋼の介在物除
去装置を提供することにある。
The present invention reliably floats and removes inclusions in molten steel by stably blowing a predetermined amount of gas, even though the above-mentioned disadvantages of the conventional method include uniform fine bubbles. In addition, we have developed a device for removing inclusions from molten steel in the tundish, which greatly improves the quality of molten steel by suppressing the rocking of the bath surface during the floating removal of inclusions to prevent inclusions from being entrained or from air oxidation. It is about providing.
以下本考案に係るタンデイツシユ内溶鋼の介在
物除去装置について詳細に述べる。
The device for removing inclusions from molten steel in a tundish according to the present invention will be described in detail below.
第１図は本考案によるタンデイツシユ内溶鋼の
介在物除去装置の一実施例の部分拡大断面図を示
す。 FIG. 1 shows a partially enlarged cross-sectional view of an embodiment of the device for removing inclusions from molten steel in a tundish according to the present invention.
まず、図においてタンデイツシユ１の底部には
注湯口２、および上、下堰、あるいはポーラスプ
ラグ（図示せず）が設けてあり、取鍋（図示せ
ず）から溶鋼３が注湯量に応じて供給されてい
る。このタンデイツシユ１の上部にはシール用の
蓋４が載置されており、該シール蓋の適宜開口部
から羽根５を一体に設けた軸体６からなる不活性
ガスの吹込み装置７が基台８により着脱自在に保
持されている。 First, as shown in the figure, the bottom of the tundish 1 is provided with a pouring port 2 and upper and lower weirs or porous plugs (not shown), and molten steel 3 is supplied from a ladle (not shown) according to the amount of poured metal. has been done. A sealing lid 4 is placed on the top of the tundish 1, and an inert gas blowing device 7 consisting of a shaft 6 integrally provided with blades 5 is inserted from an appropriate opening of the sealing lid into a base. It is detachably held by 8.
軸体６の基部には異形歯車９が外ケース１０に
ベアリング１１を介して回動自在に設けてあり、
該異形歯車９は駆動用モーター１２に連設したマ
イタギア１３の平歯車１４に噛み合つている。ま
た、軸体６は、中心軸部１６のまわりに例えば
Al2O3系、MgO系、ZrO2系あるいはこれ等の混
合物等の耐火物１５で被覆しており、中心軸部１
６は例えば鋼、鋼合金、銅、銅合金等の金属から
なる三重管であつて中心管１６ａと内管１６ｂに
は基端部のロータリージヨイント２０からそれぞ
れArガスと冷却用のエアーが供給される。外管
１６ｃはエアーの排出路を形成している。軸体６
の浸漬部である先端部には溶鋼３を撹拌するため
の例えば６〜10枚の羽根５が設けてあり、該羽根
５間には通気性耐火物からなる不活性ガスの吹込
み部１７が前記の中心管１６ａと支管１８に連通
して設けてある。 At the base of the shaft body 6, a deformed gear 9 is rotatably provided in an outer case 10 via a bearing 11.
The irregular gear 9 meshes with a spur gear 14 of a miter gear 13 connected to a drive motor 12. Further, the shaft body 6 has a portion around the central shaft portion 16, for example.
It is coated with a refractory material 15 such as Al 2 O 3 type, MgO type, ZrO 2 type or a mixture thereof, and the central shaft portion 1
6 is a triple tube made of metal such as steel, steel alloy, copper, copper alloy, etc. Ar gas and cooling air are supplied to the central tube 16a and inner tube 16b from a rotary joint 20 at the base end, respectively. be done. The outer tube 16c forms an air discharge path. Shaft body 6
For example, 6 to 10 blades 5 for stirring the molten steel 3 are provided at the tip, which is the immersed part, and between the blades 5 there is an inert gas blowing part 17 made of a breathable refractory. It is provided so as to communicate with the central pipe 16a and the branch pipe 18.
この軸体６には先端部を溶鋼３内に湯面変動量
よりも大きい値となるように浸漬（例えば10mm以
上）して、しかも該軸体６を囲繞したスリーブ体
１９が前記のタンデイツシユの蓋４に例えば一体
に固設するか、あるいはボルト、ナツト１９等で
着脱自在に固設してある。このスリーブ体１９と
軸体６の間隙Ｌは15mm以上必要であり、これより
小さいと溶鋼３が間隙Ｌ内で凝固して軸体６の回
動を阻害する。 The tip of this shaft body 6 is immersed in the molten steel 3 to a value larger than the amount of molten metal level fluctuation (for example, 10 mm or more), and a sleeve body 19 surrounding the shaft body 6 is attached to the tundish. For example, it is fixed to the lid 4 integrally or detachably with bolts, nuts 19, etc. The gap L between the sleeve body 19 and the shaft body 6 is required to be at least 15 mm; if it is smaller than this, the molten steel 3 will solidify within the gap L and inhibit the rotation of the shaft body 6.
またスリーブ体１９の高さＨは軸体６の回動速
度（rpm）にもよるが25mm以上が必要であり、こ
れよりも高さＨが低いと該軸体６の回動に伴う遠
心力による浴面揺動（湯面の引き込みと盛上り）
時に該スリーブ体１９の上端部から流出して全体
の浴面揺動を抑制できない。なお該スリーブ体１
９は必要高さＨを確保すれば上端部には一部切欠
部（図示せず）を設けても良い。このように構成
された溶鋼の介在物除去装置の使用について述べ
る。 Also, the height H of the sleeve body 19 needs to be 25 mm or more, although it depends on the rotation speed (rpm) of the shaft body 6. If the height H is lower than this, the centrifugal force due to the rotation of the shaft body 6 is required. Swinging of the bath surface (drawing in and rise of the bath surface)
At times, the water flows out from the upper end of the sleeve body 19, making it impossible to suppress the fluctuation of the entire bath surface. Note that the sleeve body 1
9 may be provided with a partial notch (not shown) at the upper end as long as the required height H is secured. The use of the apparatus for removing inclusions from molten steel constructed as described above will be described.
タンデイツシユ１にスリーブ体１９を設けた蓋
４を載置して後に、軸体６を装着して取鍋（図示
せず）より溶鋼３を連続して供給する。溶鋼３を
タンデイツシユ１に供給する前から、該軸体６の
ロータリージヨイント２０より冷却用エアーと
Arガスを供給する。Arガスは羽根５間の吹込み
部１７から該溶鋼３中に吹込まれて該羽根５の回
動により微細化されて溶鋼３内の介在物を捕捉し
て浮上する。この間溶鋼３はArガス気泡と羽根
５の回動により撹拌されつつ清浄化されて注湯口
２からモールド（図示せず）に注入される。 After placing the lid 4 provided with the sleeve body 19 on the tundish 1, the shaft body 6 is attached and molten steel 3 is continuously supplied from a ladle (not shown). Before the molten steel 3 is supplied to the tundish 1, cooling air is supplied from the rotary joint 20 of the shaft body 6.
Supply Ar gas. Ar gas is blown into the molten steel 3 from the blowing part 17 between the blades 5, is atomized by the rotation of the blades 5, captures inclusions in the molten steel 3, and floats up. During this time, the molten steel 3 is stirred and cleaned by the Ar gas bubbles and the rotation of the blades 5, and is poured into a mold (not shown) from the pouring port 2.
タンデイツシユ１内の浴面は介在物、浮遊スラ
グの巻込み防止から静止状態が好ましく、しかも
不活性ガス雰囲気を保持して溶鋼３の空気酸化を
合せ図ることが大切である。しかし、介在物の浮
上を積極的に行なうために吹込まれるArガスの
浮力と軸体６の回動により生ずる遠心力は逆に浴
面揺動を招く。この揺動は溶鋼の液相線近傍温度
の低温鋳造に伴う溶鋼特有の特性ら極めて大きい
盛上り部２１を生じて浮上除去された介在物ある
いはスラグの再巻込みが発生するが該軸体６を囲
繞し、且つ溶鋼３内に先端を浸漬したスリーブ体
１９を設けることによつて極めて効果的に全体の
浴面揺動が抑制される。しかもスリーブ体１９内
の盛上りも一定範囲に保持されて大きな揺動が解
消する。 The bath surface in the tundish 1 is preferably in a stationary state to prevent inclusions and floating slag from being drawn in, and it is important to maintain an inert gas atmosphere to prevent air oxidation of the molten steel 3. However, the buoyant force of the Ar gas blown in to actively float the inclusions and the centrifugal force generated by the rotation of the shaft body 6 conversely cause the bath surface to oscillate. Due to the characteristics peculiar to molten steel due to low-temperature casting at a temperature near the liquidus line of molten steel, this oscillation causes an extremely large bulge 21 and re-entrainment of floated and removed inclusions or slag. By providing a sleeve body 19 surrounding the molten steel 3 and having its tip immersed in the molten steel 3, the fluctuation of the entire bath surface can be suppressed very effectively. Furthermore, the bulge within the sleeve body 19 is maintained within a certain range, eliminating large swings.
また、タンデイツシユ１内の雰囲気をArガス
雰囲気に保持する際にもスリーブ体１９の介挿に
よつて広域面のシール化が容易に行なわれる。こ
のシール手段としてもスリーブ体１９内と他広域
面とに分割して該スリーブ体１９内にArガス吹
込みを行なうことによつて効果的なAr雰囲気化
が行なえる。 Also, when maintaining the atmosphere inside the tundish 1 as an Ar gas atmosphere, a wide area can be easily sealed by inserting the sleeve body 19. As this sealing means, an effective Ar atmosphere can be created by blowing Ar gas into the sleeve body 19 by dividing it into the interior of the sleeve body 19 and other wide areas.
以上述べた如く、本考案によるタンデイツシユ
内溶鋼の介在物除去装置を用いることにより所定
ガス量の吹込みと回動撹拌による浴面の揺動を抑
制し、しかも微細な気泡の安定供給が可能とな
り、溶鋼の介在物の浮上効果が良く、浴面揺動に
伴う浮遊スラグ介在物の再巻込みのない清浄鋼を
安定して得ることができる。
As mentioned above, by using the device for removing inclusions from molten steel in a tundish according to the present invention, it is possible to suppress the fluctuation of the bath surface due to the injection of a predetermined amount of gas and rotational agitation, and moreover, it is possible to stably supply fine air bubbles. This method has a good effect of floating inclusions in molten steel, and can stably obtain clean steel without re-entrainment of floating slag inclusions due to fluctuation of the bath surface.
また、浴面の揺動を抑制することから溶鋼の空
気酸化の防止とAr雰囲気化が容易に且つ確実に
行なえる等優れた介在物の除去装置である。 In addition, it is an excellent inclusion removal device as it can prevent the molten steel from being oxidized in the air and create an Ar atmosphere easily and reliably by suppressing the fluctuation of the bath surface.
第１図は本考案によるタンデイツシユ内溶鋼の
介在物除去装置の一実施例の部分拡大断面図を示
す。
１……タンデイツシユ、２……注湯口、３……
溶鋼、４……蓋、５……羽根、６……軸体、７…
…吹込み装置、８……基台、９……異形歯車、１
５……耐火物、１７……吹込み部、１９……スリ
ーブ体、２０……ロータリージヨイント、２１…
…盛上り部。
FIG. 1 shows a partially enlarged cross-sectional view of an embodiment of the device for removing inclusions from molten steel in a tundish according to the present invention. 1... Tundishyu, 2... Pouring spout, 3...
Molten steel, 4...lid, 5...blade, 6...shaft, 7...
...Blowing device, 8...Base, 9...Irregular gear, 1
5... Refractory, 17... Blowing part, 19... Sleeve body, 20... Rotary joint, 21...
...The climax part.
Claims (1)
た軸体を回動自在に保持してタンデイツシユの溶
鋼内に浸漬するとともに、該軸体を囲繞し、先端
部を該溶鋼内に浸漬したスリーブ体を設けたこと
を特徴とするタンデイツシユ内溶鋼の介在物除去
装置。 A shaft body provided with an inert gas suction part between the blades at the tip part was rotatably held and immersed in the molten steel of the tundish, and the shaft body was surrounded and the tip part was immersed in the molten steel. A device for removing inclusions from molten steel in a tundish, characterized by being provided with a sleeve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6232985U JPH0128931Y2 (en) | 1985-04-25 | 1985-04-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6232985U JPH0128931Y2 (en) | 1985-04-25 | 1985-04-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61177755U JPS61177755U (en) | 1986-11-06 |
| JPH0128931Y2 true JPH0128931Y2 (en) | 1989-09-04 |
Family
ID=30591445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6232985U Expired JPH0128931Y2 (en) | 1985-04-25 | 1985-04-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0128931Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE534281C2 (en) * | 2009-12-08 | 2011-06-28 | Swerea Mefos Ab | Control device for a casting box |
| JP6737689B2 (en) * | 2016-11-11 | 2020-08-12 | トヨタ自動車株式会社 | Pull-up type continuous casting equipment |
-
1985
- 1985-04-25 JP JP6232985U patent/JPH0128931Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61177755U (en) | 1986-11-06 |
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