JPS60127053A - Refractories for connection of horizontal continuous casting device - Google Patents
Refractories for connection of horizontal continuous casting deviceInfo
- Publication number
- JPS60127053A JPS60127053A JP58234586A JP23458683A JPS60127053A JP S60127053 A JPS60127053 A JP S60127053A JP 58234586 A JP58234586 A JP 58234586A JP 23458683 A JP23458683 A JP 23458683A JP S60127053 A JPS60127053 A JP S60127053A
- Authority
- JP
- Japan
- Prior art keywords
- refractory
- cylindrical member
- mold
- refractories
- carbon
- 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
Classifications
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/045—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for horizontal casting
- B22D11/047—Means for joining tundish to mould
- B22D11/0475—Means for joining tundish to mould characterised by use of a break ring
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は水平連続鋳造装置の接続用耐火物に関し、特に
長時間の連続操業に耐えると共に鋳造物中への不純介在
物の混入を抑制することのできる水平連続鋳造装置の接
続用耐火物に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refractory for connecting horizontal continuous casting equipment, and in particular to a horizontal continuous casting equipment that can withstand long-term continuous operation and suppress the incorporation of impurity inclusions into cast products. This relates to refractories for connections.
水平連続鋳造法とは、鋳片の引抜きをほぼ水平な直線上
で行なう方法であり、現在主流となっている垂直式や湾
曲式の連続鋳造法に比べて、■設備高さが低いので操業
及び保全が容易であシ、又設備が比較的小型であって建
設費が安い、■鋳型がタンディツシュの側部に直結(但
し実態的には接続耐火物を介して)接続されているので
、タンディツシュ内の静圧が直接鋳型内の溶鋼にかかつ
て鋳片形状の精度が良好になる他、大気による溶鋼の2
次酸化が起こらないので鋳片の滞浄度が高い、等の特長
を有しているところから、最近になつてその利点が見直
され実用化の為の研究が積極的に進められている。The horizontal continuous casting method is a method in which slabs are drawn in a nearly horizontal straight line, and compared to the currently mainstream vertical and curved continuous casting methods, the equipment height is lower, making it easier to operate. It is easy to maintain, and the equipment is relatively small and the construction cost is low. ■The mold is directly connected to the side of the tundish (however, in reality, it is connected via a connecting refractory), The static pressure inside the tundish is directly applied to the molten steel in the mold, which improves the accuracy of the slab shape.
Since secondary oxidation does not occur, the stagnation level of the cast slab is high, and other advantages have recently been reconsidered, and research is being actively carried out to put it into practical use.
ところが上記の様な特長を有する反面、幾つか特有の欠
点を有しておシ、該欠点のうち最も大きいものの1つと
して「タンディツシュと鋳型を結ぶ接続用耐火物(以下
単に接続用耐火物という)に要求される特性が非常に厳
しい」ということが挙げられる。However, although it has the above-mentioned features, it also has some unique drawbacks, and one of the biggest drawbacks is that "connection refractories connecting the tundish and the mold (hereinafter simply referred to as connection refractories)" ), the characteristics required are very strict.
即ち接続用耐火物には、(a)タンディツシュと鋳鋳型
の間に入って両者の接続を確実に行なわせる為高度の寸
法精度を有していること、(b)溶鋼注入時の急激な温
度変化に耐え得る耐熱衝撃性を有していること、(c)
高温長時間の連続操業に耐え得る耐溶損性を有している
こと、等が要求される他、(d)鋳型による冷却効果が
接続用耐火物側にも及んで当該耐火物の内周面側にも凝
固殻が生成するが、該凝固殻との摩擦を抑制して鋳片の
引抜きを円滑に行なわせる為には、内面性状が平滑且つ
緻密であると共に、溶鋼の差し込みを防止できる程度に
低濡れ性のものでなければならないという特性も要求さ
れる。この様な要求特性を満たす素材としてはBN系物
質やSi、N4 系物質等の高価なセラミックスが知ら
れており、接続用耐火、物全体をこの様な素材で作製す
れば操業面で問題を生ずることは殆んどない。しかし素
材が極めて高価である為、過大な経済的負担が課せられ
る。In other words, the connecting refractory must (a) have a high degree of dimensional accuracy in order to fit between the tundish and the casting mold to ensure a secure connection between the two, and (b) be able to withstand sudden temperatures during injection of molten steel. (c) It has thermal shock resistance that can withstand changes.
In addition to being required to have corrosion resistance that can withstand continuous operation at high temperatures and for long periods of time, (d) the cooling effect of the mold also extends to the connecting refractory side, causing damage to the inner peripheral surface of the refractory. A solidified shell is also formed on the side, but in order to suppress the friction with the solidified shell and allow the slab to be pulled out smoothly, the inner surface must be smooth and dense, and at the same time, it must be smooth and dense enough to prevent molten steel from being inserted. It is also required that the material has low wettability. Expensive ceramics such as BN-based materials, Si, and N4-based materials are known as materials that meet these required characteristics, and if the fireproof connections and the entire object are made of such materials, there will be no operational problems. It almost never occurs. However, since the materials are extremely expensive, an excessive economic burden is imposed.
一方上記要求特性のうち(a)及び(d)は接続用耐火
物と鋳型との接触部近傍のみに要求される特性であると
ころから、接続用耐火物をフィードノズルとブレークリ
ングの対によって構成し、鋳型との接続側には前記(a
)〜(a)の特性を兼備した高価なセラミックスよシな
るブレークリングを配置し、該ブレークリングとクンデ
ィツシュの接続には、前記(b)及び(c)の特性を有
する安価な耐火物(ジルコン質等)製のフィードノズル
を使用するのが通例となっている。例えば第1図はこう
した従来の接続用耐火物の配置例を示す要部縦断面図で
あって、クンディツシュ(図面上表われない)と鋳型1
はフィードノズル2及びブレークリング3によシ同心的
に接続されておシ、フィードノズル2は安価な酸化物系
耐火材で形成し、一方ブレークリング3は高価なセラミ
ックス耐火材で形成している。On the other hand, among the above required characteristics, (a) and (d) are required only near the contact area between the connecting refractory and the mold, so the connecting refractory is constructed by a pair of a feed nozzle and a break ring. The connection side with the mold has the above (a)
A break ring made of expensive ceramic material having the characteristics of ) to (a) is arranged, and an inexpensive refractory material (zircon) having the characteristics of (b) and (c) is arranged to connect the break ring and the kundish. It is customary to use a feed nozzle made by A. For example, FIG. 1 is a longitudinal cross-sectional view of the main parts showing an example of the arrangement of such conventional connection refractories, showing a kundish (not shown in the drawing) and a mold 1.
is concentrically connected to a feed nozzle 2 and a break ring 3, and the feed nozzle 2 is made of an inexpensive oxide refractory material, while the break ring 3 is made of an expensive ceramic refractory material. .
尚フィードノズル2とブレークリング3及び鋳型1の各
内径は溶鋼の流れ方向に沿って順次大きくなる様に形成
し、段差部で生ずる溶鋼流の乱れをできるだけ抑制する
様に構成している。この様な接続構造であれば、フィー
ドノズル2は前記(b)及び(C)の要求特性を備え、
又ブレークリング3は前記(a)〜(d)の要求特性を
備えているので、定常運転時においては殆んど問題は生
じない。ところが、アイ4−ドノズル2の温度が十分に
上がっていない鋳造初期、或は溶鋼温度が低下する鋳造
末期、更には操業異常によって引抜停止時間が遅れた場
合等において、凝固シェルがフィードノズル2まで成長
じてくると、前記特性(a)、(d)を十分に備えてハ
ない酸化物系耐火物製のフィードノズル2は凝固シェル
の固着・引抜きにより比較的簡単に損傷を受ける。殊に
フィードノズル2の引抜側端の段差部2aは破損し易い
。そして一旦局部的な破損が起こるとこの部分に凝固シ
ェルが差し込んで破損は急激に進行し、更にはブレーク
リング3との接合境界部が損傷を受けて凝固シェルが差
し込み、ついにはブレークリング3が破壊してブレーク
アウトという重大事故に発展していく。しかもフィード
ノズル2の破損により溶鋼内に混入した酸化物系耐火物
は不純介在物となって鋳造物の品質を著しく劣化させる
。The inner diameters of the feed nozzle 2, the break ring 3, and the mold 1 are formed so as to increase successively along the flow direction of the molten steel, so as to suppress as much as possible the turbulence of the molten steel flow that occurs at the stepped portions. With such a connection structure, the feed nozzle 2 has the required characteristics of (b) and (C) above,
Furthermore, since the break ring 3 has the required characteristics (a) to (d) above, almost no problems occur during steady operation. However, in the early stages of casting when the temperature of the eye-drilling nozzle 2 has not risen sufficiently, or in the late stages of casting when the molten steel temperature drops, or even when the withdrawal stop time is delayed due to operational abnormalities, the solidified shell may not reach the feed nozzle 2. As the feed nozzle 2 grows, the feed nozzle 2 made of an oxide-based refractory having sufficient characteristics (a) and (d) is relatively easily damaged due to sticking and pulling out of the solidified shell. In particular, the stepped portion 2a at the end of the feed nozzle 2 on the drawing side is easily damaged. Once local damage occurs, a solidified shell is inserted into this area and the damage progresses rapidly.Furthermore, the joint boundary with the break ring 3 is damaged and the solidified shell is inserted, and finally the break ring 3 is damaged. This leads to serious accidents such as destruction and breakouts. Furthermore, the oxide refractories mixed into the molten steel due to the breakage of the feed nozzle 2 become impurity inclusions and significantly deteriorate the quality of the casting.
こうした問題を回避する最も簡単な方策としてはブレー
クリング3を十分に長くすることが考えられるが、そう
すると(1)高価なセラミックスの使用量が増大する為
コストが高騰する、(11)ブレークリング3の材質に
よっては長尺化に伴って耐熱衝撃性が低下する、といっ
た障害が生じてくる。従ってこの様な障害を伴うことな
く前述の問題を解消するととのできる技術を開発する必
要がある。The easiest way to avoid these problems would be to make the break ring 3 sufficiently long, but this would (1) increase the amount of expensive ceramics used, leading to a rise in cost; (11) the break ring 3 Depending on the material, problems such as a decrease in thermal shock resistance may occur as the length increases. Therefore, there is a need to develop a technique that can solve the above-mentioned problems without causing such obstacles.
本発明は、上記の様な状況のもとて特にフィードノズル
の損傷を防止すべく種々研究の結果完成されたものであ
って、その構成は、水平連続鋳造装置におけるタンディ
ツシュと鋳型の間に介装される接続用中空耐火物であっ
て、該耐火物は、2個以上の筒状部材を直列的に組合せ
て構成すると共K、各筒状部材は鋳型側に配置するもの
ほど内径を大きく形成し、且つ鋳型側から数えて2番目
の筒状部材は、
〔I〕5〜40重量%の炭素を含み残部が実質的に酸化
物よりなる耐火性素材で形成するか、或は
■〕5〜40重量%の炭素と、20重量%以下の高融点
炭化物及び/又は高融点室イし物を含み、残部が実質的
に酸化物よシなる耐火性素材、
により形成したものでちるところに要旨を有するもので
ある。The present invention was completed as a result of various studies aimed at preventing damage to the feed nozzle under the above-mentioned circumstances. The refractory is constructed by combining two or more cylindrical members in series, and the inner diameter of each cylindrical member is larger as it is placed closer to the mold. The second cylindrical member counted from the mold side is either [I] formed of a fire-resistant material containing 5 to 40% by weight of carbon and the remainder substantially consisting of an oxide, or (■) A refractory material containing 5 to 40% by weight of carbon, 20% by weight or less of a high melting point carbide and/or a high melting point carbide, and the remainder being essentially an oxide. The main points are as follows.
以下実施例図面を参照しながら本発明の構成及び作用効
果を詳細に説明する。第2図は本発明の代表的な実施例
を示すもので、接続用耐火物は筒状部材4a、4b、4
cの3個を1組として直列的に組合せて構成されるもの
で、筒状部材4aは第1図のフィードノズル2に対応し
、筒状部材4cは同図のブレークリング3に対応すると
共に、これら筒状部材4a、4Cの間に筒状部材4bを
中間リングとして介装した構造となっている。そしてこ
れらの筒状部材4a、4b、4cは鋳型1側に配置する
ものほど内径を大きく形成している。DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration and effects of the present invention will be described in detail below with reference to the drawings. FIG. 2 shows a typical embodiment of the present invention, in which the connecting refractories are cylindrical members 4a, 4b, 4
The cylindrical member 4a corresponds to the feed nozzle 2 in FIG. 1, and the cylindrical member 4c corresponds to the break ring 3 in the same figure. The structure is such that a cylindrical member 4b is interposed as an intermediate ring between these cylindrical members 4a and 4C. These cylindrical members 4a, 4b, and 4c are formed so that the closer they are disposed to the mold 1, the larger the inner diameter thereof.
この中間リング4bの使用は、各接続境界部における段
差をできるだけ小さくして溶鋼流のよどみを少なくし凝
固殻の生成を抑制するうえで重要な要件となる。又本発
明では鋳型1に隣接する筒状部材4cは前記要求特性(
a)〜(d)を備えだセラミックス製のものとするが、
その隣#)(即ち鋳型1側から数えて2番目)の筒状部
材4bは前記CI)又は叩に示した耐火材で形成し、筒
状部材4aは通常の酸化物系耐火材で形成する。この様
に筒状部材4 as 4 bs 4 cの素材を変えた
理由は次の通シである。即ち第1図に示した従来の接続
例で本発明者等が得た知見によると、ブレークリング3
の鋳型1側は凝固殻が生成し易い為前記要求特性(a)
及び(d)に対する要求が強く、当該特性を備えたセラ
ミックスを使用しなければならないのに対し、フィード
ノズル2側は鋳型1側に比べて溶鋼温度が高く、凝固殻
が生成するにしても薄肉である為、凝固殻の生成及び引
抜き時に損傷を受ける程度はかなり少ない。そこでまず
第1に、ブレークリング3を2分割して前記要求特性(
a)、(d)が真に要求される鋳型1側はセラミックス
で形成し、フィードノズル2側は通常の酸化物系耐火物
で形成することを考えだ。しかしフィードノズル2側と
いえども相当量の凝固殻が発生することはない。The use of the intermediate ring 4b is an important requirement in order to minimize the step difference at each connection boundary, thereby reducing stagnation of the molten steel flow and suppressing the formation of solidified shells. Further, in the present invention, the cylindrical member 4c adjacent to the mold 1 has the above-mentioned required characteristics (
It is made of ceramics and is equipped with a) to (d).
The cylindrical member 4b next to it (#) (i.e., the second one counting from the mold 1 side) is made of the refractory material shown in CI) or 3 above, and the cylindrical member 4a is made of a normal oxide-based refractory material. . The reason for changing the materials of the cylindrical members 4 as 4 bs 4 c in this manner is as follows. That is, according to the knowledge obtained by the present inventors using the conventional connection example shown in FIG.
Since a solidified shell is likely to form on the mold 1 side, the required characteristic (a) is not met.
There are strong requirements for (d) and ceramics with these characteristics must be used, but the molten steel temperature on the feed nozzle 2 side is higher than that on the mold 1 side, and even if a solidified shell is formed, the wall is thin. Therefore, the degree of damage during the formation and extraction of the solidified shell is quite small. Therefore, first of all, the break ring 3 is divided into two parts and the required characteristics (
The idea is to form the mold 1 side, where a) and (d) are truly required, from ceramics, and the feed nozzle 2 side from ordinary oxide-based refractories. However, even on the feed nozzle 2 side, a considerable amount of solidified shell is not generated.
従ってフィードノズル2偶に配置される当該リング3の
要求特性としては、前記(b)、(c)及び(d)がも
つとも重要であるとはいっても(d)の要求特性につい
ては鋳型1側に隣接配置するものほど高レベルの性能は
要求されない。又経済性を考えれば当該リングの素材を
廉価なものから選択すべきであることは言うまでもない
。こうした知見を基に上記の様な要求特性を満たす比較
的安価な素材を種々検索した結果、前記CI)又は叩の
耐火性素材に想到したものである。しかして〔I〕の耐
火性素材の必須成分は5〜40重量%の炭素であり、叩
の耐火性素材はこれに20重量%の高融点炭化物及び/
又は高融点窒化物を加えたもので、何れも残部は酸化物
系耐火物から々るものであるが、かかる要件を規定した
理由は次の通シで鉛る。即ちここでいう炭素とは高温処
理によって一部又は全部が黒鉛化されたものを言うが、
これをアルミナ、シリカ、マグネシア、ジルコニア等の
酸化物と組合せた酸化物・炭素系耐火物はセラミックス
に比べて極めて安価であるにもかかわらず、耐摩耗性、
耐熱衝撃性及び溶融スラグに対する耐浸食性はかなシ良
好であシ、5重量%以上の炭素を含むものであれば、フ
ィードノズル側に配置される筒状部材4bとしての要求
特性を満足する。但し炭素量が40重量%を超えるもの
では、溶鋼への炭素の溶解・拡散による溶損が著しくな
り、目的を果たすことができなくなる。又高融点の炭化
物及び窒化物(例えばS 1c1B、C,Sis N、
、AIN。Therefore, although the above (b), (c) and (d) are important as the required characteristics of the ring 3 disposed in the feed nozzle 2, the required characteristic of (d) is on the mold 1 side. A higher level of performance is not required than those placed adjacent to the . In addition, it goes without saying that in consideration of economic efficiency, the material for the ring should be selected from inexpensive materials. Based on this knowledge, we searched for various relatively inexpensive materials that met the above-mentioned required characteristics, and as a result, we came up with the above-mentioned CI) or hammered fire-resistant material. However, the essential component of the fire-resistant material [I] is 5 to 40% by weight of carbon, and the refractory material of [I] contains 20% by weight of high-melting point carbide and/or carbon.
Or a high-melting point nitride is added, with the remainder being an oxide-based refractory.The reason for stipulating this requirement is explained in the following passage. In other words, carbon here refers to carbon that has been partially or completely graphitized by high-temperature treatment.
Oxide/carbon-based refractories made by combining these with oxides such as alumina, silica, magnesia, and zirconia are extremely inexpensive compared to ceramics, but have excellent wear resistance and
Thermal shock resistance and erosion resistance against molten slag are fairly good, and if it contains 5% by weight or more of carbon, it satisfies the characteristics required for the cylindrical member 4b disposed on the feed nozzle side. However, if the carbon content exceeds 40% by weight, the melting loss due to dissolution and diffusion of carbon into the molten steel becomes significant, and the purpose cannot be achieved. Also, high melting point carbides and nitrides (e.g. S 1c1B, C, Sis N,
, A.I.N.
BN等)を適量追加すると、耐摩耗性及び耐熱衝撃性は
更に向上するが、20重量%を超えると焼結性が悪化し
てスポーリングが発生し易くなる他、経済的にも不利と
なる。残部成分である酸化物は耐熱性を備えたものであ
る限シその種類の如何は問われないが、代表的なのはア
ルミナ、シリカ、マグネシア、ジルコニア等の単品及び
これらの混合物である。Adding an appropriate amount of BN, etc.) further improves wear resistance and thermal shock resistance, but if it exceeds 20% by weight, sinterability deteriorates and spalling is more likely to occur, and it is also economically disadvantageous. . The type of oxide that is the remaining component does not matter as long as it is heat resistant, but typical examples include alumina, silica, magnesia, zirconia, etc. alone and mixtures thereof.
この様に本発明では@型1に隣したブレークリング(第
2図の筒状部材4c)よ)もフィードノズル側でちって
、且つ比較的薄肉の凝固殻が生成し得る部分に、特定の
耐火性素材よ)なる中間リング(筒状部材4b)を配置
することによって、高価なセラミック製プレークリング
を従来よシ短尺のものとすることができコストダウンが
計れると共に、該ブレークリングに隣接する耐火物の凝
固シェルによる損傷を抑制することができ、連続鋳造を
長時間安定して行なうことができると共に、耐火物の損
傷に起因する不純介在物の混入が防止されて鋳片の品質
を高めることができる。尚第2図の例では、フィードノ
ズルとブレークリングの間に配置される中間リングを前
記〔■〕又は叩の耐火性素材で形成した例を示したが、
CI)又は市〕の耐火性素材は通常の酸化物系耐火性素
材と比較してもそれ程高価なものではないから、第1図
に示した様なブレークリング3に直接隣接配置されるフ
ィードノズル2全体を前記CI’l又は叩の耐火性素材
で形成することも有効である。In this way, in the present invention, the break ring (cylindrical member 4c in Fig. 2) adjacent to the mold 1 is also chipped on the feed nozzle side, and a specific By arranging the intermediate ring (cylindrical member 4b) made of a fire-resistant material, the expensive ceramic break ring can be made shorter than before, reducing costs, and the intermediate ring (cylindrical member 4b) made of fire-resistant material Damage caused by the solidified shell of the refractory can be suppressed, allowing continuous casting to be performed stably for a long period of time, and the quality of slabs is improved by preventing inclusion of impurity inclusions caused by damage to the refractory. be able to. In the example shown in Fig. 2, the intermediate ring disposed between the feed nozzle and the break ring is made of the above-mentioned [■] or the tamped fire-resistant material.
CI) or City] fire-resistant materials are not so expensive compared to ordinary oxide-based fire-resistant materials, so a feed nozzle placed directly adjacent to the break ring 3 as shown in Figure 1 is suitable. It is also effective to form the entire part 2 from the above-mentioned CI'l or tamped fire-resistant material.
次に実験例を示す。Next, an experimental example will be shown.
実験例
第1図及び第2図に示した接続構造において、フィード
ノズル2(筒状部材4a)とブレークリング3(筒状部
材4c)又はこれらと中間リング(筒状部材4b)を種
々変更し、下記の条件で水平連続鋳造を行なった場合の
凝固シェルによる段差部の損傷状況を調べた。Experimental Examples In the connection structure shown in Figs. 1 and 2, various changes were made to the feed nozzle 2 (cylindrical member 4a) and break ring 3 (cylindrical member 4c), or these and the intermediate ring (cylindrical member 4b). We investigated the damage to the stepped portion caused by the solidified shell when horizontal continuous casting was performed under the following conditions.
鋳込温度: 1550℃ 鋳片径 : 110mmφ 引抜速度:z、3m/分 供試溶鋼: SUS 304.5トン 結果を第1表に一括して示す。 Casting temperature: 1550℃ Slab diameter: 110mmφ Pulling speed: z, 3m/min Test molten steel: SUS 304.5 tons The results are summarized in Table 1.
第1表において、実験陰1〜8は中間リングを用いるこ
となくプレークリングにフィードノズルを直接々続しだ
もので、フィードノズルの素材を変えた例であるが、フ
ィードノズルをジルコン質や高アノペナ質の様な通常の
酸化物系累月で成形したもの(実験hh1.2及び穀で
は、倒れもフィードノズルの段差部における損傷が著し
い。また炭素を配合したフィードノズルであってもその
配合量が5M量条以下のもの(実験陽3)では、耐熱衝
撃性及び耐摩耗性が不十分であり、一方炭素の配合量が
40重量%を超えると(実験Nn6)、溶鋼への炭素の
溶出・拡散が著しくなり、何れも段差部の損傷は急速に
進行する。これらに対し適量の炭素を配合したフィード
ノズル(実験Na4及び5)であれば、段差部の損傷は
極めて僅かなものとすることができる。In Table 1, Experiments 1 to 8 are examples in which the feed nozzle was directly connected to the plaque ring without using an intermediate ring, and the material of the feed nozzle was changed. For those molded with a normal oxide-based compound such as Anopena (experiment hh1.2 and grains, there was significant collapse and damage at the stepped portion of the feed nozzle.Also, even if the feed nozzle contains carbon, the When the amount of carbon is less than 5M (Experiment No. 3), thermal shock resistance and wear resistance are insufficient, while when the amount of carbon exceeds 40% by weight (Experiment No. 6), the carbon content in the molten steel is insufficient. Elution and diffusion become significant, and damage to the stepped portion progresses rapidly.In contrast, if the feed nozzle contains an appropriate amount of carbon (Experiments Na4 and 5), the damage to the stepped portion is extremely slight. can do.
又実験は9〜21は、酸化物系耐火材よシなるフィード
ノズルとセラミックス製プレークリングの間に中間リン
グを介装した例であり、該中間リングを通常の酸化物系
耐火物で形成したもの(実験N[19及び10)及び炭
素量が5重量係未満の複合耐火物で形成したもの(実験
阻11)は、何れも中間リングとプレークリングの段差
1部における損傷が著しいのに対し、本発明の規定要件
を満たす複合耐火物で中間リングを成形したもの(実験
N[112〜20では、段差部の損傷を低レベルに抑え
ることができる。殊に中間リングの内面側では、薄肉で
あるとはいえ相当量の凝固シェルが生成するが、適量の
炭素と共に少量の高融点炭化物(又は高融点窒化物)を
配合した耐火物を使用することによしく実験Nn113
〜21)、段差部の損傷を更に抑制することができる。Experiments 9 to 21 are examples in which an intermediate ring was interposed between a feed nozzle made of an oxide refractory material and a ceramic plaque ring, and the intermediate ring was formed of an ordinary oxide refractory material. In both cases (Experiment N [19 and 10)] and one made of composite refractories with a carbon content of less than 5% by weight (Experiment No. 11), there was significant damage at one part of the step between the intermediate ring and the plate ring. , where the intermediate ring is molded from a composite refractory that meets the specified requirements of the present invention (in experiments N [112 to 20, damage to the stepped portion can be suppressed to a low level. Especially on the inner surface of the intermediate ring, the thin wall However, a considerable amount of solidified shell is generated, but it is better to use a refractory containing a small amount of high melting point carbide (or high melting point nitride) with an appropriate amount of carbon (Experiment Nn113).
~21), damage to the stepped portion can be further suppressed.
第1.2図は接続用耐火物の配置例を示す概略縦断面説
明図である。
1・・・鋳型 2・・・フィードノズル3・・・プレー
クリング 2a・・・段差部4a・・・筒状部材(フィ
ードノズル)4b・・・筒状部材(中間リングFIG. 1.2 is a schematic vertical cross-sectional view showing an example of the arrangement of connecting refractories. 1... Mold 2... Feed nozzle 3... Plaque ring 2a... Step portion 4a... Cylindrical member (feed nozzle) 4b... Cylindrical member (intermediate ring
Claims (2)
の間に介装される接続用中空耐火物であって、該耐火物
は、2個以上の筒状部材を直列的に組合せて構成すると
共に、各筒状部材は鋳型側に配置するものほど内径を大
きく形成し、且つ鋳型側から数えて2番目の筒状部材は
、5〜40重量%の炭素を含み残部が実質的に酸化物よ
シなる耐火性素材によ多形成したものであることを特徴
とする水平連続鋳造装置の接続用耐火物。(1) A connecting hollow refractory interposed between a tundish and a mold in a horizontal continuous casting device, the refractory being constructed by combining two or more cylindrical members in series, and each The inner diameter of the cylindrical member is made larger as it is disposed closer to the mold, and the second cylindrical member counted from the mold side contains 5 to 40% by weight of carbon, with the remainder being substantially composed of oxides. A refractory for connecting horizontal continuous casting equipment, characterized in that it is made of multi-layered refractory material.
の間に介装される接続用中空耐火物であって、該耐火物
は、2個以上の筒状部材を直列的に組合せて構成すると
共に、各筒状部材は鋳型側に配置するものほど内径を大
きく形成し、且つ鋳型側から数えて2番目の筒状部材は
、5〜40重量%の炭素と20重量%以下の高融点炭火
物及び/又は高融点窒化物を含み残部が実質的に酸化物
よ)なる耐火性素材によ多形成したものであることを特
徴とする水平連続鋳造装置の接続用耐火物。(2) A connecting hollow refractory interposed between a tundish and a mold in a horizontal continuous casting device, the refractory being constructed by combining two or more cylindrical members in series, and each The inner diameter of the cylindrical member is made larger as it is disposed closer to the mold, and the second cylindrical member counted from the mold side contains 5 to 40% by weight of carbon, 20% by weight or less of high melting point charcoal, and/or A refractory for connecting a horizontal continuous casting apparatus, characterized in that it is made of a refractory material containing a high melting point nitride and the remainder being substantially an oxide.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58234586A JPS60127053A (en) | 1983-12-12 | 1983-12-12 | Refractories for connection of horizontal continuous casting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58234586A JPS60127053A (en) | 1983-12-12 | 1983-12-12 | Refractories for connection of horizontal continuous casting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60127053A true JPS60127053A (en) | 1985-07-06 |
Family
ID=16973339
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58234586A Pending JPS60127053A (en) | 1983-12-12 | 1983-12-12 | Refractories for connection of horizontal continuous casting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60127053A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61117343U (en) * | 1984-12-29 | 1986-07-24 |
-
1983
- 1983-12-12 JP JP58234586A patent/JPS60127053A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61117343U (en) * | 1984-12-29 | 1986-07-24 | ||
JPH0216840Y2 (en) * | 1984-12-29 | 1990-05-10 |
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