JPH03291132A - Apparatus for continuously casting hollow cast billet - Google Patents
Apparatus for continuously casting hollow cast billetInfo
- Publication number
- JPH03291132A JPH03291132A JP9312790A JP9312790A JPH03291132A JP H03291132 A JPH03291132 A JP H03291132A JP 9312790 A JP9312790 A JP 9312790A JP 9312790 A JP9312790 A JP 9312790A JP H03291132 A JPH03291132 A JP H03291132A
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- cooling
- mold
- pool
- columnar
- 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.)
- Pending
Links
- 238000005266 casting Methods 0.000 title description 7
- 239000002184 metal Substances 0.000 claims abstract description 52
- 229910052751 metal Inorganic materials 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 239000011819 refractory material Substances 0.000 claims abstract description 13
- 230000006698 induction Effects 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 238000009749 continuous casting Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 27
- 238000007711 solidification Methods 0.000 abstract description 15
- 230000008023 solidification Effects 0.000 abstract description 15
- 230000010355 oscillation Effects 0.000 abstract description 10
- 239000000498 cooling water Substances 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract 2
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 235000010585 Ammi visnaga Nutrition 0.000 description 1
- 244000153158 Ammi visnaga Species 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、中空鋳片の連続鋳造装置ｃ関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a continuous casting apparatus c for hollow slabs.
この発明は、比較的薄肉の鋼管などの製造に利用される
。This invention is utilized for manufacturing relatively thin-walled steel pipes.
［従来の技術］
連続鋳造により最終製品管に近い中空鋳片を得ることが
できれば、高合金のような圧延加工不良材を始めとする
各種材質の金属管製造に大幅なコストタウンを期待する
ことがてきる。[Conventional technology] If it is possible to obtain hollow slabs that are similar to final product pipes through continuous casting, we can expect significant cost reductions in the production of metal pipes made of various materials, including poorly rolled materials such as high alloys. It's coming.
このような中空鋳片を連続鋳造する装置は、従来より広
く検討されてきており、また種々の装置か提案されてい
る。Apparatuses for continuously casting such hollow slabs have been widely studied, and various apparatuses have been proposed.
これらの装置の一つに、上方に向って広がるように開口
する湯溜りを貫通して冷却鋳型に至るまで柱状冷却中子
を挿入して冷却鋳ヤと柱状冷却中子との間に環状の空間
を形成し、湯溜りに溶融金属を注入しながら冷却鋳型か
ら中空鋳片を引き抜き、中空鋳片を連続鋳造する装置が
ある。湯溜りを上方に向って広がるようじ開口する形状
としているのは、注入された溶融金属の湯面変動の影響
を小さくするとともに、タ：ノディッシュなどから湯溜
りへの湯の供給を容易Ｃするためである。冷却鋳型は湯
溜りの下方に配置されている７、柱状冷却中子は冷却水
で内部より冷却される。また、鋳片と鋳型および柱状冷
却中子との焼付き防止、あるいは鋳片の引抜き抵抗を小
さくするために、冷却鋳型および柱状冷却中子は上下に
振動される。In one of these devices, a columnar cooling core is inserted through a pool that opens upward and reaches the cooling mold, and an annular cooling core is inserted between the cooling caster and the columnar cooling core. There is an apparatus that continuously casts hollow slabs by forming a space and drawing hollow slabs from a cooling mold while injecting molten metal into a pool. The shape of the pool with a toothpick opening that expands upward reduces the effect of fluctuations in the level of the poured molten metal, and also makes it easier to supply hot water from a nodish etc. to the pool. It's for a reason. The cooling mold is placed below the pool 7, and the columnar cooling core is cooled from inside with cooling water. Further, the cooling mold and the columnar cooling core are vibrated up and down in order to prevent seizure between the slab and the mold and the columnar cooling core, or to reduce the pulling resistance of the slab.
このような装置に属するものとして、たとえば特開平１
−１５０４３３号公報あるいは特開平！−１５０４３４
号公報の中空鋳片連続鋳造用モールド装置がある。For example, as a device belonging to this type of device, there is
-150433 Publication or Unexamined Patent Publication! -150434
There is a mold device for continuous casting of hollow slabs disclosed in the publication.
［発明が解決しようとする課Ｍ］
上記従来の中空鋳片の連続鋳造装置には、次のような問
題があった。。[Problem M to be Solved by the Invention] The conventional continuous casting apparatus for hollow slabs has the following problems. .
すなわち、中空鋳片の引抜き速度は比較的遅いので、湯
溜りに供給された溶融金属はある程度の時間湯溜りに留
まることになる。また、湯溜りはＬ方に向って広がるよ
うに開口する形状をしているので、溶湯表面からの放熱
量が太きく、湯溜り内の溶湯の温度が降下しやすい。こ
のため、湯溜りで溶融金属が凝固してしまい （ホット
マスの生成）、これは下方に引き抜かれることなく留ま
るため、操業上支障を来す。また、上記従来の装置では
湯溜り下にブレークリングを用い、凝固開始点の一定化
ならびに凝固開始点を湯面下に位置づけることによりオ
シレーションマークの低減か図られている。しかし、ブ
レークリングを用いることにより、コールドシャットク
ラックならびにホットティアか生じ、鋳片表面性状の欠
陥は解決されない。また、ブレークリングを用いること
により、鋳片の肉厚の最低値に制限が生じて好ましくな
い。That is, since the drawing speed of the hollow slab is relatively slow, the molten metal supplied to the pool remains in the pool for a certain period of time. Furthermore, since the pool has a shape that opens to widen in the L direction, the amount of heat radiated from the surface of the molten metal is large, and the temperature of the molten metal in the pool tends to drop. As a result, the molten metal solidifies in the pool (creating hot mass), and this remains without being drawn downward, causing operational problems. Furthermore, in the above-mentioned conventional apparatus, a break ring is used below the water pool to stabilize the solidification start point and to position the solidification start point below the surface of the hot water to reduce oscillation marks. However, by using a break ring, cold shut cracks and hot tears occur, and defects in the surface texture of the slab are not resolved. Further, the use of a break ring imposes a limit on the minimum thickness of the slab, which is not preferable.
中空鋳片の場合、内面の手入れが困難であるため、後処
理不要な内表面性状良好な鋳片の鋳造か必要となる、
そこでこの発明は、内外表面とも表面性状良好な中空鋳
片の連続鋳造装置を提供しようとするものである。In the case of hollow slabs, it is difficult to maintain the inner surface, so it is necessary to cast slabs with good inner surface quality without the need for post-treatment.Therefore, this invention aims to create a continuous cast of hollow slabs with good surface quality on both the inner and outer surfaces. The purpose is to provide a casting device.
この発明の中空鋳片の連続鋳造装置は、上方に向って広
がるように開口する湯溜りと、湯溜りの下方に配置され
た冷却鋳型と、湯溜りを貫通（、て冷却鋳型内に至る柱
状冷却中子とを備え、湯溜りから冷却鋳型に溶融金属を
供給しながら冷却鋳型から中空鋳片を引き抜く装置にお
いて、上記湯溜りおよび湯溜り内の溶融金属を溶融金属
の液相線以トの温度に保持する誘導加熱装置を備えてい
る。そして２上記柱状冷却中子の湯面近傍の外周面が、
低熱伝導性耐火材でライニングされている。The continuous casting apparatus for hollow slabs of the present invention includes a molten metal pool that opens upwardly, a cooling mold placed below the molten metal pool, and a columnar shape that penetrates the molten metal pool (and extends into the cooling mold). In a device that is equipped with a cooling core and draws a hollow slab from the cooling mold while supplying molten metal from the sump to the cooling mold, the sump and the molten metal in the sump are cooled below the liquidus line of the molten metal. The outer peripheral surface of the columnar cooling core near the hot water surface is equipped with an induction heating device to maintain the temperature.
Lined with low thermal conductivity refractory material.
中空鋳片の断面形状は、円形に限られるものてはなく、
長円形、角形などであってもよい。The cross-sectional shape of hollow slabs is not limited to circular shapes;
It may be oval, square, etc.
柱状中子の外壁と鋳片間の摩擦の低減を中子のオシレー
ションとパウダ゛−の潤滑にて図る際、オシレーション
マークならびにパウダーの不均一流入による縦割れ、表
皮下のピンホール等の表面欠陥が生しる。そのため、前
記柱状中子の湯面近傍の外周面を低熱伝導性耐火材でラ
イニングすることにより、凝固開始点を湯面下にかっラ
イニングされている耐火材下に位置づける。そのため、
柱状中子に加えられる振動は径方向あるいは周方向であ
る必要がある。なぜなら、上下方向にオシレーションが
加えられると初期凝固シェルにオシレーションと共に耐
火材に押し付は引っ張りが加わりコールドシ、ヤツトク
ラックなっらびにホットティアが生し表面欠陥の闘決に
ならない。そのため、柱状中子には径方向あるいは周方
向の高周波振動が加えられる。When trying to reduce the friction between the outer wall of the columnar core and the slab through core oscillation and powder lubrication, oscillation marks, vertical cracks due to uneven inflow of powder, pinholes under the skin, etc. Surface defects occur. Therefore, by lining the outer circumferential surface of the columnar core near the hot water surface with a low thermally conductive refractory material, the solidification starting point is positioned below the hot water surface and below the lined refractory material. Therefore,
The vibration applied to the columnar core must be in the radial direction or circumferential direction. This is because when oscillation is applied in the vertical direction, the initial solidified shell is pressed and pulled against the refractory material along with the oscillation, resulting in cold shears, cracks, and hot tears, which prevent surface defects from being fought. Therefore, high-frequency vibrations in the radial direction or circumferential direction are applied to the columnar core.
湯溜りを構成する耐火材は、湯溜りを誘導加熱するため
に導電性を要し、また湯溜りの壁厚を薄くし、加熱誘導
コイルを湯溜り内の溶融金属にてきるだけ近づけるため
に高強度であることが望ましい。このような耐火材とし
て、アルミナグラファイトなどを用いることかできる。The refractory material that makes up the hot water pool needs to be conductive in order to heat the hot water pool by induction, and in order to reduce the wall thickness of the hot water pool and bring the heating induction coil as close as possible to the molten metal in the hot water pool. High strength is desirable. As such a refractory material, alumina graphite or the like may be used.
湯溜りの出側から冷却鋳型に至る間の内径は、鋳片の外
径と同径にすることが好ましい。この点、従来の連続鋳
造装置では湯溜りと冷却鋳型とを結ぶ湯道に内径方向に
突出するブレークリングなどか配置されている。ブレー
クリンクを用いることにより、凝固開始点の一定化なら
びに湯面下に位置づけることによりオシレーションマー
クの低減は図られるが、コールドシャットクラックある
いはホットティアを生じ、鋳片表面性状の欠陥は解決さ
れない。これに対し、この発明では湯潅りおよび溶融金
属をこれの液相線温度以上に加熱することにより、湯溜
りでの凝固を防止するとともに、凝固開始点を湯面下に
かつ非冷却鋳型内に制御することにより鋳片表面性状の
改善を図っている。It is preferable that the inner diameter from the outlet side of the sump to the cooling mold be the same as the outer diameter of the slab. In this regard, in conventional continuous casting equipment, a break ring or the like is disposed in the runner connecting the molten metal pool and the cooling mold, which protrudes in the inner diameter direction. By using a break link, it is possible to stabilize the solidification start point and reduce oscillation marks by positioning it below the molten metal surface, but cold shut cracks or hot tears occur, and defects in the surface texture of the slab are not resolved. In contrast, in this invention, by heating the molten metal and the molten metal above its liquidus temperature, solidification in the molten metal pool is prevented, and the solidification start point is set below the molten metal surface and inside the uncooled mold. By controlling this, the surface quality of the slab is improved.
柱状冷却中子は良熱伝導性の材料、たとえば銅、炭化け
い素なとが用いられる。柱状冷却中子の外周面をライニ
ングする低熱伝導性耐火材として、凝固殻との潤滑性向
上を狙ってポロンナイトライド、窒化珪素等を用いる。The columnar cooling core is made of a material with good thermal conductivity, such as copper or silicon carbide. Poron nitride, silicon nitride, etc. are used as the low thermal conductivity refractory material lining the outer peripheral surface of the columnar cooling core with the aim of improving lubricity with the solidified shell.
ライニングの径は、非冷却部は抜熱量を減少させるため
中子径より大きく、凝固開始位置は中子と同径でありか
つ中子と耐火材との接合部が凝固開始位置より下方にあ
ることが望ましい。さもなければ、接合部への湯差しに
より生じた凝固殻か引き抜かれることなく留まれば鋳片
表面性状に悪影響を及ぼす。ライニングの厚みは、耐火
材の熱伝導率にもよるが、 １〜５ ｍｍ程度である。The diameter of the lining is larger than the core diameter in the non-cooled part to reduce the amount of heat removed, and the solidification start position is the same diameter as the core, and the joint between the core and the refractory material is below the solidification start position. This is desirable. Otherwise, if the solidified shell produced by pouring hot water into the joint remains without being pulled out, the surface quality of the slab will be adversely affected. The thickness of the lining is approximately 1 to 5 mm, depending on the thermal conductivity of the refractory material.
加振装置としては通常の装置、たとえば電歪型または磁
歪型の振動子および高周波発生電源からなる装置が用い
られる。As the vibration excitation device, a conventional device, for example, a device consisting of an electrostrictive or magnetostrictive vibrator and a high frequency generation power source is used.
鋳片の凝固収縮に応して、柱状冷却中子は下方に向って
先細りとすることか好ましい。先細りのテーパーの大き
さは０．５〜１．０木栓度である。これにより、柱状冷
却中子からの鋳片の分離がよくなり、凝固殻の割れ、ス
ティッキンクあるいはブリートの発生か防止される。ま
た、銅の表面に炭化けい素などの耐熱材料をコーチイン
クしてもよい。It is preferable that the columnar cooling core tapers downward in response to solidification shrinkage of the slab. The size of the tapered taper is 0.5 to 1.0 wood plug degree. This improves the separation of the slab from the columnar cooling core, and prevents the solidified shell from cracking, sticking, or bleating. Alternatively, a heat-resistant material such as silicon carbide may be coated on the surface of the copper.
［作用］
湯溜りおよび溶融金属は加熱により溶融金属の液相＆Ｉ
温度以上に保持されるのて、湯面よりも１方から凝固が
始まる。溶融金属を加熱して所要温度に８！極的に保持
するのて、凝固開始点の制御は容易である。上方に向っ
て広がるように開口している。容積の大きな湯溜りで溶
融金属を加熱するので、湯溜り内の溶融金属の熱容量は
大きい。したがって、湯溜り内の溶融金属の温度変化は
少なく、溶融金属を所要温度に保持しやすい。[Function] The puddle and the molten metal are heated to form a liquid phase of the molten metal.
Since the temperature is maintained above the molten metal, solidification begins from one side below the surface of the molten metal. Heat the molten metal to the required temperature 8! By keeping it polar, it is easy to control the solidification starting point. It opens to widen upwards. Since the molten metal is heated in a large-volume pool, the heat capacity of the molten metal in the pool is large. Therefore, there is little change in the temperature of the molten metal in the pool, and it is easy to maintain the molten metal at a required temperature.
また、柱状冷却中子の湯面近傍の外周面が、低熱伝導性
耐火材でライニングされているので、湯面近傍の溶融金
属は柱状冷却中子により冷却されない。この結果、柱状
冷却中子により冷却される鋳片内径側も、ライニング下
方つまり湯面下方がら溶融金属の凝固か始まる。Further, since the outer circumferential surface of the columnar cooling core near the hot water surface is lined with a low thermal conductivity refractory material, the molten metal near the hot water surface is not cooled by the columnar cooling core. As a result, the molten metal on the inner diameter side of the slab cooled by the columnar cooling core also starts to solidify from below the lining, that is, from below the molten metal surface.
［実施例］
第１図はこの発明の装置の一例を示すものであって、管
状鋼鋳片の連続鋳造装置の縦断面図である。[Example] Fig. 1 shows an example of the apparatus of the present invention, and is a longitudinal sectional view of a continuous casting apparatus for tubular steel slabs.
連続鋳造装置は、主として湯溜り１１、非冷却鋳型１５
、冷却鋳型１８、柱状冷却中子２４、および誘導加熱装
置３３から構成されている。The continuous casting device mainly consists of a tundish 11 and a non-cooled mold 15.
, a cooling mold 18, a columnar cooling core 24, and an induction heating device 33.
湯溜り１１は上方に向って広がるように開口しており、
アルミナグラファイトで作られている。湯溜り１１の容
量は、８０００ｃｍ”である。The hot water reservoir 11 is opened so as to expand upward,
Made of alumina graphite. The capacity of the hot water reservoir 11 is 8000 cm''.
非冷却鋳型１５は円筒状をしており、湯溜り１１と一体
に形成されている。非冷却鋳型１５の内径は、中空鋳片
Ｐの外径つまり冷却鋳型１８の内径に等しい。The uncooled mold 15 has a cylindrical shape and is formed integrally with the tundish 11. The inner diameter of the non-cooled mold 15 is equal to the outer diameter of the hollow slab P, that is, the inner diameter of the cooling mold 18.
冷却鋳型１８は、溶鋼Ｍに接するグラファイト製６の内
筒１９と銅製の外筒２０よりなっている。内筒１９の上
端が非冷却鋳型１５の下端に接続されている。The cooling mold 18 consists of an inner cylinder 19 made of graphite 6 and an outer cylinder 20 made of copper, which is in contact with the molten steel M. The upper end of the inner cylinder 19 is connected to the lower end of the non-cooled mold 15.
また、非冷却鋳型Ｉ５と円筒との接続位置は、外筒２０
の上端より少くとも １０ｍｍ以上下側に位置させてい
る。これは、凝固開始位置を必ず接続位置よりも上方に
位置づけ、接続部への溶鋼Ｍの侵入を防止するためであ
る。In addition, the connection position between the non-cooled mold I5 and the cylinder is at the outer cylinder 20.
It is located at least 10mm below the top edge of the This is to ensure that the solidification start position is located above the connection position and to prevent molten steel M from entering the connection area.
柱状冷却中子２４の本体２５は銅製の庇付円筒よりなっ
ており、本体２５は長さが１ｍであり、溶鋼メニスカス
位置における外径がＩ００＋＋＋ｍである。柱状冷却中
子の外周面をポロンナイトライドてライニング２６シて
いる。ライニング２６の厚みは５ｍｍであり、長さは５
０ｍｍである。また、下端に向って先細りとなるように
０．４９６の一定のチルパーが付けられている。本体２
５は湯溜り１１および非冷却鋳型１５を貫通して冷却鋳
型１８内に挿入されている。本体２５には、２重管を形
成するように内部には導水管２７か挿入されている。導
水管２７の頂部には冷却水供給管２９が、また本体２５
の頂部のカバー３０には冷却水排出管３１かそれぞれ接
続されている。冷却水は導水管２７を通り下降して本体
２５下部に至り、っいて本体２５と導水管２７の間を通
って上昇する。冷却水は上昇する際に本体２５を冷却す
る。したがって、本体２５は下部になるほど強く冷却さ
れる。また、本体２５は加振装置３６により高周波振動
が与えられる。The main body 25 of the columnar cooling core 24 is made of a cylinder with an eave made of copper, has a length of 1 m, and an outer diameter at the molten steel meniscus position of I00+++ m. The outer peripheral surface of the columnar cooling core is lined with poron nitride. The thickness of the lining 26 is 5 mm, and the length is 5 mm.
It is 0mm. Additionally, a constant chiller of 0.496 is attached so that it tapers toward the bottom end. Main body 2
5 is inserted into the cooling mold 18 through the sump 11 and the non-cooled mold 15. A water guide pipe 27 is inserted into the main body 25 so as to form a double pipe. A cooling water supply pipe 29 is provided at the top of the water conduit 27, and a cooling water supply pipe 29 is provided at the top of the water conduit 27.
A cooling water discharge pipe 31 is connected to the cover 30 on the top of each. The cooling water descends through the water conduit 27 and reaches the lower part of the main body 25, and then passes between the main body 25 and the water conduit 27 and rises. The cooling water cools the main body 25 as it rises. Therefore, the lower part of the main body 25 is cooled more strongly. Further, the main body 25 is given high frequency vibration by a vibrator 36 .
誘導加熱装置３３は、加熱コイル３４が湯溜り１１の外
形に沿うように配置されている。加熱コイル３４には、
定格出力２００ｋｗ、］、２ｋＨｚの高周波電Ｒ（図示
しない）が接続されている。The induction heating device 33 is arranged such that the heating coil 34 follows the outer shape of the hot water reservoir 11 . The heating coil 34 includes
A high frequency electric generator R (not shown) with a rated output of 200 kW and 2 kHz is connected.
加振装Ｗ３６は、本体２５の頂部に周方向に等間隔に取
り付けられた４本の振動子３７とこれに高周波電流を供
給する高周波発生電源３８からなる。振幅の谷底値をで
きるだけ大きくするため、異なる周波数にて高周波振動
が加えられる。The vibration device W36 includes four vibrators 37 attached to the top of the main body 25 at equal intervals in the circumferential direction, and a high-frequency generation power source 38 that supplies high-frequency current to the vibrators 37. High-frequency vibrations are applied at different frequencies in order to make the bottom value of the amplitude as large as possible.
タンティッシュ （図示しない）の底部に接続された浸
漬ノズル４１が、湯溜り１１に挿入されている。An immersion nozzle 41 connected to the bottom of a tongue tissue (not shown) is inserted into the sump 11.
上記湯溜り１１．非冷却鋳型１５、および冷却鋳型１８
は、加振装置 （図示しない）により上下振動が与えら
れる。The above hot water pool 11. Non-cooled mold 15 and cooled mold 18
is given vertical vibration by a vibrating device (not shown).
ここて、以上のように構成された装置により、管状鋼鋳
片を連続鋳造する方法について説明する。鋳造した中空
鋳片Ｐは、内径１０ｆ１ｍ１１１、外径１６０ｍｍ（肉
厚３０ｍｍ）および１８０ｍｍ （肉厚４０ｍｍ）の２
サイズであって、材質は高炭素ｔＩ４（炭素濃度０．５
和であった・
まず、鋳造開始前に湯溜り１１を加熱コイル３４により
溶鋼Ｍの液相線温度以上に加熱した。この状態を保持し
ながら、湯溜り１１、非冷却鋳型１５および冷却鋳型１
８内に柱状冷却中子２４を上方より挿入し、セットした
。Here, a method for continuously casting tubular steel slabs using the apparatus configured as described above will be described. The cast hollow slab P has an inner diameter of 10f1m111, an outer diameter of 160mm (wall thickness 30mm) and 180mm (wall thickness 40mm).
The material is high carbon tI4 (carbon concentration 0.5
First, before starting casting, the molten metal sump 11 was heated to a temperature higher than the liquidus temperature of the molten steel M using the heating coil 34. While maintaining this state, the tundish 11, the uncooled mold 15, and the cooled mold 1 are
The columnar cooling core 24 was inserted into the chamber 8 from above and set.
ついて、タンティッシュ （図示しない）から浸漬ノズ
ル４１を介し、溶鋼Ｍを湯溜り１１に供給した。注湯開
始から２０秒経過したのちに湯溜り口。Then, molten steel M was supplied to the tundish 11 from a tongue tissue (not shown) through the immersion nozzle 41. After 20 seconds have passed from the start of pouring, open the hot water reservoir.
非冷却鋳型１５等を振動させ、３０秒後に鋳片Ｐの弓抜
きを開始した。湯溜り１１等の上下振動は、振幅が±４
■であり、振動数は１１００ｃｐであった。The uncooled mold 15 and the like were vibrated, and 30 seconds later, the bowing of the slab P was started. The vertical vibration of the hot water pool 11 etc. has an amplitude of ±4
■, and the vibration frequency was 1100 cp.
また、柱状中子２４の振動条件は、相対する２本の振動
子は１．８５ｋＨｚにて加振され、他２木は１８〜１８
．５．１Ｆ１．５〜１９ｋＨｚの間で振幅が最大となる
よう調整された。振幅は２ ｕｎであった。鋳片Ｐの引
抜きはビンチロール （図示しない）により、引抜き速
度は０．４ｍ／ｍｉｎであった。鋳造中５湯溜り１】お
よび湯溜り内の溶鋼Ｍを加熱コイル３４により、溶鋼Ｍ
の液相線温度以上に加熱保持した。凝固殻ａ、ｂの形成
開始位置は鋳片内径側では湯面下Ｏｍｍであり、また外
径側では非冷却鋳型１５内に制御することができ、非冷
却鋳型１５と冷却鋳型１８との接合部への溶鋼Ｍの侵入
によるトラブルなく鋳造することができた。Furthermore, the vibration conditions for the columnar core 24 are such that the two opposing vibrators are vibrated at 1.85kHz, and the other two pieces of wood are vibrated at 18-18kHz.
．． The amplitude was adjusted to be maximum between 5.1F1.5 and 19kHz. The amplitude was 2 un. The slab P was pulled out using a vinyl roll (not shown) at a drawing speed of 0.4 m/min. During casting, the molten steel M is heated by the heating coil 34.
The temperature was maintained at a temperature above the liquidus temperature. The formation start position of the solidified shells a and b can be controlled to be 0 mm below the molten metal surface on the inner diameter side of the slab, and within the non-cooled mold 15 on the outer diameter side, and to prevent the joining between the non-cooled mold 15 and the cooled mold 18. It was possible to cast without any trouble caused by the intrusion of molten steel M into the parts.
上記のようにして得られた鋳片は、２サイズとも外表面
性状についてはいずれもオシレーション７−りの発生か
みられず、良好であった。また、内表面性状については
、いずれも鋳片のトップ部分およびボトム部分以外では
割れなどは己められなかった。また、鋳片肉厚は、周方
向および鋳造方向ともに士Ｊｌｌｌｌ１１の範囲内で一
様であった。The cast slabs obtained as described above had good outer surface properties in both sizes, with no occurrence of oscillation. Regarding the inner surface properties, no cracks were observed in any areas other than the top and bottom parts of the slabs. Further, the thickness of the slab was uniform within a range of 11 mm in both the circumferential direction and the casting direction.
［発明の効果］
この発明による中空鋳片の連続鋳造装置は、湯溜りおよ
び湯溜り内の溶融金属を加熱して溶融金属の液相線温度
以上にＭ極的に保持する誘導加熱装置を備えているとと
もに、柱状冷却中子の湯面近傍は低熱伝導性耐火材によ
りライニングされている。したかって、湯面が変動して
も、鋳片内径側および外径側て確実に湯面以下て溶融金
属の凝固か始まる。この結果、鋳型の上下振動により発
生する鋳片内外周面のオシレーションマークの形成を抑
えることかでき、表面性状良好な中空鋳片の連続鋳造が
可能となり、また鋳片表面の後処理か不要となった。[Effects of the Invention] The continuous casting apparatus for hollow slabs according to the present invention includes a pool and an induction heating device that heats the molten metal in the pool and maintains it at the M pole above the liquidus temperature of the molten metal. In addition, the area near the hot water surface of the columnar cooling core is lined with a low thermal conductivity refractory material. Therefore, even if the molten metal level fluctuates, solidification of the molten metal will certainly begin below the molten metal level on the inner and outer diameter sides of the slab. As a result, it is possible to suppress the formation of oscillation marks on the inner and outer peripheral surfaces of the slab, which are caused by the vertical vibration of the mold, making it possible to continuously cast hollow slabs with good surface quality, and there is no need for post-treatment of the slab surface. It became.
第１図はこの発明の装置の一例を示すものであって、管
状鋼鋳片の連続鋳造装置の縦断面図である。
１１・・・湯溜り、１５−・非冷却鋳型、Ｉ ８−・・
冷却鋳型、２４−、、柱状冷却中子、２６・・・ライニ
ング、２７・・−導水管、３３・・・誘導加熱装置、３
４・・・誘導加熱コイル、３６・・・加振装置、４１−
・・浸漬ノズル、Ｍ−・・溶鋼、Ｐ・−・中空鋳片、ａ
、ｂ＝凝固殻。FIG. 1 shows an example of the apparatus of the present invention, and is a longitudinal sectional view of a continuous casting apparatus for tubular steel slabs. 11... Pool, 15-- Non-cooled mold, I 8-...
Cooling mold, 24-, columnar cooling core, 26... lining, 27...- water pipe, 33... induction heating device, 3
4... Induction heating coil, 36... Vibration device, 41-
...Immersion nozzle, M--molten steel, P--hollow slab, a
, b = solidified shell.
Claims (1)
りの下方に配置された冷却鋳型と、湯溜りを貫通して冷
却鋳型内に至る柱状冷却中子とを備え、湯溜りから冷却
鋳型に溶融金属を供給しながら冷却鋳型から中空鋳片を
引き抜く中空鋳片の連続鋳造装置において、前記湯溜り
および湯溜り内の溶融金属を溶融金属の液相線以上の温
度に保持する誘導加熱装置を備え、前記柱状冷却中子の
湯面近傍の外周面が低熱伝導性耐火材でライニングされ
ていることを特徴とする中空鋳片の連続鋳造装置。1.Equipped with a trough that opens upward, a cooling mold placed below the trough, and a columnar cooling core that penetrates the trough and extends into the cooling mold. In a continuous casting device for hollow slabs that draws hollow slabs from a cooling mold while supplying molten metal to the mold, induction heating is used to maintain the pool and the molten metal in the pool at a temperature above the liquidus line of the molten metal. 1. A continuous casting apparatus for hollow slabs, characterized in that the outer peripheral surface of the columnar cooling core near the molten metal surface is lined with a low thermal conductive refractory material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9312790A JPH03291132A (en) | 1990-04-10 | 1990-04-10 | Apparatus for continuously casting hollow cast billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9312790A JPH03291132A (en) | 1990-04-10 | 1990-04-10 | Apparatus for continuously casting hollow cast billet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03291132A true JPH03291132A (en) | 1991-12-20 |
Family
ID=14073856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9312790A Pending JPH03291132A (en) | 1990-04-10 | 1990-04-10 | Apparatus for continuously casting hollow cast billet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03291132A (en) |
-
1990
- 1990-04-10 JP JP9312790A patent/JPH03291132A/en active Pending
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