JPH0616930B2 - Immersion nozzle for continuous casting - Google Patents
Immersion nozzle for continuous castingInfo
- Publication number
- JPH0616930B2 JPH0616930B2 JP62270603A JP27060387A JPH0616930B2 JP H0616930 B2 JPH0616930 B2 JP H0616930B2 JP 62270603 A JP62270603 A JP 62270603A JP 27060387 A JP27060387 A JP 27060387A JP H0616930 B2 JPH0616930 B2 JP H0616930B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- immersion nozzle
- molten steel
- continuous casting
- mold
- 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 - Lifetime
Links
- 238000007654 immersion Methods 0.000 title claims description 26
- 238000009749 continuous casting Methods 0.000 title claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 238000005266 casting Methods 0.000 claims description 11
- 238000007598 dipping method Methods 0.000 claims description 6
- 230000035515 penetration Effects 0.000 description 12
- 239000000843 powder Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 230000003749 cleanliness Effects 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000005499 meniscus Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は連続鋳造法においてタンデイツシユ内の溶鋼を
鋳型に鋳込むためのノズル、特に１ンデイシユ底部に取
付けられ下端が鋳型内溶鋼中に浸漬され溶鋼を断機状態
で鋳込むのに使用される浸漬ノズルの改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a nozzle for casting molten steel in a tundish into a mold in a continuous casting method, in particular, it is attached to the bottom of one end and the lower end is immersed in the molten steel in the mold. The present invention relates to improvement of a dipping nozzle used for casting molten steel in a machine-breaking state.
（従来の技術） 連続鋳造法において、高品質鋼を製造する際には、鋳込
溶鋼流の二次酸化を避けるため、浸漬ノズルを用いて断
気鋳造を実施することが必須である。(Prior Art) When producing high-quality steel in the continuous casting method, it is essential to carry out degassing casting using a dipping nozzle in order to avoid secondary oxidation of the molten steel flow for casting.
鋳型の断面積の大きい連続機においては、浸漬ノズル
(a)としては、第６図に示すような、溶鋼通路の内腔(b)
の下端部から吐出孔(c)を横方向に向けた横方向吐出型
が採用されている。しかし鋳型断面積の小さい連鋳機に
おいては横方向吐出型浸漬ノズル(a)は鋳型(d)の壁との
距離が小さいため、第６図に示すように、矢印(A)の溶
鋼吐出流が凝固シエル(e)に勢よく衝突してシエルを再
溶解し、その結果、鋳片の縦割れ、ブレークアウト等の
トラブルを招く。また、シエルに衝突した吐出流(A)か
ら上方に向かいメニスカス部(f)で反転する溶鋼流(B)は
表面の鋳型パウダー(g)からパウダー粒子(h)を巻込むな
どして、品質欠陥を招く。For continuous machines with large mold cross-sectional areas, immersion nozzle
As (a), as shown in FIG. 6, the inner diameter of the molten steel passage (b)
A horizontal discharge type is adopted in which the discharge holes (c) are oriented in the horizontal direction from the lower end of the. However, in a continuous casting machine with a small mold cross-sectional area, the horizontal discharge type immersion nozzle (a) has a small distance from the wall of the mold (d), so as shown in FIG. Violently collides with the solidified shell (e) and redissolves the shell, resulting in problems such as vertical cracking of the slab and breakout. In addition, the molten steel flow (B) that goes upward from the discharge flow (A) that collides with the shell and reverses at the meniscus part (f) involves the inclusion of powder particles (h) from the mold powder (g) on the surface. Cause defects.
そのため、小断面高速連鋳では、第７図に示すように、
底端に吐出孔(c1)を設けた底吐出型浸漬ノズル(a1)を採
用している。Therefore, in small-section high-speed continuous casting, as shown in FIG.
A bottom discharge type immersion nozzle (a1) having a discharge hole (c1) at the bottom end is used.
（発明が解決しようとする問題点） 前記の底吐出型浸漬ノズルは、凝固シエルの再溶解、鋳
型パウダーの巻込みは防止されるものの、ノズル底から
下向きの溶鋼吐出流(A1)は鋳型内溶鋼域内へのもぐり込
み深さが深くなる。そして溶鋼吐出流のもぐり込みは溶
鋼中に存在する介在物の鋳型内での浮上除去能と密接な
関係があり、もぐり込み深さが浅いほど浮上除去能は向
上し、鋼の清浄度は改善される。この点で底吐出型浸漬
ノズル(a1)は吐出流(A1)のもぐり込みが深いため、鋼の
清浄化に悪影響が及ぶ点で問題がある。(Problems to be solved by the invention) In the bottom discharge type immersion nozzle, although the remelting of the solidified shell and the entrainment of the mold powder are prevented, the downward molten steel discharge flow (A1) from the nozzle bottom is in the mold. The depth of penetration into the molten steel region becomes deep. The penetration of the molten steel discharge flow is closely related to the floating removal ability of inclusions existing in the molten steel in the mold.The shallower the penetration depth, the higher the floating removal ability and the better the cleanliness of the steel. To be done. In this respect, the bottom discharge type immersion nozzle (a1) has a problem that the cleaning flow of steel is adversely affected because the discharge flow (A1) penetrates deeply.
本発明は、従来技術の上記問題点を解決し、溶鋼吐出流
のもぐり込みを浅くし鋳片内に捕捉される介在物を少な
くし鋼の清浄性を向上することのできる底吐出型浸漬ノ
ズルを提供することを目的とする。The present invention solves the above-mentioned problems of the prior art, shallows the molten steel discharge flow, reduces inclusions trapped in the slab, and improves the cleanliness of steel. The purpose is to provide.
（問題点を解決するための手段） 前記目的は、本発明において、底吐出型浸漬ノズルの溶
鋼吐出流のもぐり込みが浅くなるよう改善するため、浸
漬ノズルの内腔の下部を適正関係のテーパー付として形
成し、吐出孔の面積を大きくして吐出流速を流況の撹乱
を伴わないで遅くすることにより達成される。(Means for Solving the Problems) In the present invention, in order to improve the depth of penetration of the molten steel discharge flow of the bottom discharge type immersion nozzle, the above object is to make the lower part of the inner cavity of the immersion nozzle have a proper taper. This is achieved by increasing the area of the discharge hole and slowing the discharge flow velocity without disturbing the flow regime.
すなわち、本発明の連続鋳造用浸漬ノズルは、小断面鋳
片連続鋳造用鋳型内浸漬ノズルにおいて、タンディッシ
ュ内溶鋼を鋳型に鋳込む浸漬ノズルの内腔の形状を、そ
の上部が径ｄの直線状で、その下部が直線状上部につづ
き下端の吐出口に向かって拡がるテーパー状でそのテー
パ部の角度θ、テーパー部の長さｌ、直線状上部の径ｄ
との間に、 ｌtanθ ≧０．０８ｄ ｌ ≧ ２ｄ θ ＜ ６゜ の関係を与えて形成されることを特徴とする。That is, the immersion nozzle for continuous casting of the present invention is a small-section cast piece continuous casting in-mold immersion nozzle, in which the shape of the lumen of the immersion nozzle for casting molten steel in the tundish into the mold is a straight line with a diameter d. The shape of the taper is such that the lower part thereof is a linear upper part and is expanded toward the discharge port at the lower end, and the angle θ of the tapered part, the length l of the tapered part, and the diameter d of the linear upper part.
It is characterized in that it is formed by giving a relationship of ltan θ ≧ 0.08d l ≧ 2dθ <6 °.
（作用） 本発明浸漬ノズルでは、下端吐出孔から下方に向かう溶
鋼吐出流の流速は前以てテーパー部で減速されるので、
吐出流のもぐり込みは浅くなり、鋳片内に捕捉される介
在物が少なくなり、鋼の清浄性が向上する。(Operation) In the immersion nozzle of the present invention, since the flow velocity of the molten steel discharge flow downward from the lower end discharge hole is previously reduced by the taper portion,
The discharge flow becomes shallower, the inclusions trapped in the slab are reduced, and the cleanliness of the steel is improved.
（実施例） 第１図は、本発明の１実施例を連続鋳造用ノズルの断面
形およびその各種特性値の関係を示す。(Embodiment) FIG. 1 shows the relationship between the cross-sectional shape of a continuous casting nozzle and various characteristic values thereof according to an embodiment of the present invention.
このノズル(1)は、溶鋼通路の内腔(2)の上部が径ｄの直
線部(3)で、それに続く長さｌの下部(4)を下端吐出孔
(5)に向かって拡がるテーパー角度θのテーパー状に形
成したものである。(g)は鋳型内溶鋼上の鋳型パウダー
を示す。In this nozzle (1), the upper part of the inner cavity (2) of the molten steel passage is a straight part (3) of diameter d, and the lower part (4) of length l following it is the lower end discharge hole.
It is formed in a taper shape with a taper angle θ that widens toward (5). (g) shows the mold powder on the molten steel in the mold.
この浸漬ノズルにおける吐出溶鋼流のもぐり込み深さ
は、主としてテーパー下部の長さｌ、テーパー角度θか
らなる関数ｌtanθとの関係により支配される。第２図
は縦軸のもぐり込み深さ指数と横軸のｌtanθとの関係
を示す。ｌtanθ＝０はテーパーなしで、その場合のも
ぐり込み深さ指数を１．０としている。ｌtanθが大き
くなるほど、もぐり込み深さは浅くなる。The penetration depth of the discharged molten steel flow in this immersion nozzle is mainly governed by the relationship with the function l tan θ consisting of the length 1 of the taper lower part and the taper angle θ. FIG. 2 shows the relationship between the depth of penetration index on the vertical axis and ltan θ on the horizontal axis. When ltan θ = 0, there is no taper, and the penetration depth index in that case is 1.0. The larger the ltan θ, the shallower the penetration depth.
テーパー角度θについては大きいほど有効ということに
なるが、テーパー角度が６゜より大き過ぎると、第３図
（イ）のように、内腔(2)内で偏流(C)が生じて溶鋼流速
が低下せず、もぐり込み深さを浅くする改善効果が低下
する。第３図は横軸のテーパー角度θと縦軸の偏流の有
無との関係を示す。第２図の点(x)は過度のテーパー角
度がもぐり込み深さ低減の左程の効果がないことを示
す。また偏流に伴ってノズル内に淀み部(D)が発生し介
在物付着発生の起点となり、溶鋼清浄効果を損う。The larger the taper angle θ is, the more effective it is. However, if the taper angle is larger than 6 °, a drift (C) occurs in the lumen (2) and the molten steel flow velocity as shown in Fig. 3 (a). Does not decrease, and the effect of improving the depth of penetration is reduced. FIG. 3 shows the relationship between the taper angle θ on the horizontal axis and the presence or absence of drift on the vertical axis. Point (x) in FIG. 2 shows that an excessive taper angle does not have the left-hand effect of reducing the penetration depth. In addition, a stagnation part (D) is generated in the nozzle due to the uneven flow, and this becomes a starting point for the inclusion of inclusions, impairing the molten steel cleaning effect.
またテーパー部長さｌについてはｌ≧2dとするのが適切
である。テーパー部長さがこれより短か過ぎると、第４
図（イ）に示すように、内腔内で流速が一様にならず中
心部流速が速いままで吐出される。第４図（ロ）は横軸
のテーパー部長さｌと縦軸の中心部吐出流速指数との関
係を示す。この結果、ｌが2dより小さい場合は、もぐり
込み深さ低減効果は小さい。第２図の点(y)はかかる例
を示す。Further, it is appropriate that l ≧ 2d for the taper length l. If the taper length is too short,
As shown in the figure (a), the flow velocity is not uniform in the lumen, and the central portion is discharged with the high flow velocity. FIG. 4 (b) shows the relationship between the taper length 1 on the horizontal axis and the central discharge velocity index on the vertical axis. As a result, when 1 is smaller than 2d, the effect of reducing the depth of the recess is small. Point (y) in FIG. 2 shows such an example.
ｌ、θが大きい場合、浸漬ノズルの下部の壁厚が薄くな
る。この場合、第５図実施例に示すように、外周も同じ
くテーパー状に形成して下端吐出孔部の壁厚の薄化が起
こらないようにし耐熱性を保全する。When l and θ are large, the wall thickness at the lower part of the immersion nozzle becomes thin. In this case, as shown in FIG. 5 embodiment, the outer periphery is also formed in a tapered shape so that the wall thickness of the lower end discharge hole portion is not thinned and heat resistance is maintained.
（発明の効果） 本発明の底吐出型浸漬ノズルでは、１５５mm角の最小級
断面の鋳片を連続鋳造する場合でも、 (1)ノズル内腔に直線状上部を設け、該直線状上部にづ
つく下部のみの形状を吐出孔に向かって拡がるテーパー
状に形成し、それにより、テーパー状部の長さが長くな
らないようにして、吐出口溶鋼流速分布の均等化を図る
とともに、この場合に、 (2)テーパー部の角度θを、偏流の起る６゜以下で、な
るべく大きな角度とし、 (3)テーパー部の長さｌを、中心部の流速が早くなる２
ｄ（ｄ直線部径）以上であるが、過度に長くせず、 (4)さらに、もぐり込み深さを、もぐり込み指数の低下
するｌtanθ≧０．０８ｄの条件を満足させることによ
り、 第１図のように、テーパー部を浸漬先端深さの範囲内に
形成することが可能となる。(Effects of the Invention) With the bottom discharge type immersion nozzle of the present invention, even when continuously casting a 155 mm square minimum grade cross-section slab, (1) a linear upper part is provided in the nozzle bore, and the linear upper part The shape of only the lower part is formed in a taper shape that expands toward the discharge hole, so that the length of the tapered part does not become long and the molten steel flow velocity distribution of the discharge port is equalized, and in this case, (2) The angle θ of the taper part is set to be as large as possible within 6 ° at which uneven flow occurs, and (3) the length l of the taper part is set so that the flow velocity at the center part becomes faster.
d (d straight part diameter) or more, but do not make it excessively long. (4) Further, by satisfying the condition of ltan θ ≧ 0.08d at which the penetration index decreases, As shown in the drawing, the tapered portion can be formed within the range of the depth of the immersion tip.
従って、ノズル外径の下方拡大を起させないで、小断面
鋳型との間隔の狭隘化の問題を解決し、しかも、パウダ
ーラインでの浸漬ノズルの肉厚が薄くならないようにし
て、パウダーライン溶損の問題を解決し、同時にもぐり
込み深さを浅くすることができる。Therefore, the problem of narrowing the gap with the small cross-section mold is solved without causing downward expansion of the nozzle outer diameter, and moreover, the wall thickness of the immersion nozzle in the powder line is not thinned, and the powder line meltdown The problem of can be solved, and at the same time the depth of penetration can be reduced.
すなわち、本発明は、小断面鋳片連続鋳造溶鋳型内浸漬
ノズルとして特に有用であって、線材、棒鋼の一貫連続
熱間圧延の出発材料となるような、例えば、１５５mm角
程度の最小級断面の鋳片を、小断面連鋳機で浸漬ノズ
ル、パウダーキャスティングにより断気連続鋳造する場
合に、ノズルの浸漬先端と鋳型側壁との間隔が狭隘なこ
とによる鋳造上の諸問題を招くことなく、パウダーライ
ンの溶損に対し浸漬ノズルの肉厚を確保しつつ、さら
に、底吐出型浸漬ノズルの溶鋼吐出流のもぐり込み深さ
を浅くして、介在物の浮上機会を与えて鋳片内に捕捉さ
れる介在物が少なくし、鋼の清浄性を向上できるもので
ある。That is, the present invention is particularly useful as a dipping nozzle for continuous casting of small-section cast slabs and is a starting material for consistent continuous hot rolling of wire rods and bars, for example, a minimum grade section of about 155 mm square. The slab of, the immersion nozzle in a small cross-section continuous casting machine, when performing degassing continuous casting by powder casting, without causing various problems in casting due to the narrow distance between the immersion tip of the nozzle and the mold side wall, While ensuring the wall thickness of the immersion nozzle against melting damage of the powder line, the depth of the molten steel discharge flow of the bottom discharge type immersion nozzle is made shallower to give the opportunity to float inclusions and to be embedded in the slab. The inclusions to be captured are reduced and the cleanliness of steel can be improved.
第１図は本発明の１実施例の連続鋳造用ノズルの各種特
性値記入の縦断側面図、第２図はその特性値の関数ｌta
nθを横軸にとりもぐり込み深さ指数を縦軸にとって示
す図表、第３図（イ）はテーパー角度が過大の場合の偏
流発生状況を示す縦断側面図、第３図（ロ）はテーパー
角度を横軸にとり偏流の有無を縦軸にとって示す図表、
第４図（イ）は浸漬ノズル下端の溶鋼流速分布を示す縦
断側面図、第４図（ロ）はテーパー部長さを横軸にとり
中心部吐出流速指数を縦軸にとって示す図表、第５図は
本発明の変形実施例の連続鋳造用浸漬ノズルの縦断側面
図、第６図は従来技術の横方向吐出型ノズルの鋳型内に
おける縦断側面図、第７図は従来技術の底吐出型ノズル
の鋳型内における縦断側面図である。 (1)……浸漬ノズル、(2)……内腔、(3)……直線部、(4)
……下部、(5)……吐出孔、(d)……内腔上部径、(e)…
…テーパー長さ、（θ）……テーパー角度、(C)……偏
流、(D)……淀み部、(x)(y)……点、(a)(a1)……浸漬ノ
ズル、(b)……内腔、(c)(c1)……吐出孔、(d)……鋳
型、(e)……凝固シエル、(f)……メニスカス部、(g)…
…鋳型パウダー、(h)……パウダー粒子、(A)(A1)……溶
鋼吐出流、(B)……反転溶鋼流。FIG. 1 is a vertical sectional side view showing various characteristic values of a continuous casting nozzle according to an embodiment of the present invention, and FIG. 2 is a function lta of the characteristic values.
Chart showing nθ on the horizontal axis and depth index on the vertical axis. Fig. 3 (a) is a vertical sectional side view showing the situation of drift flow when the taper angle is excessive, and Fig. 3 (b) shows the taper angle. Chart showing the presence or absence of drift on the horizontal axis, on the vertical axis,
FIG. 4 (a) is a vertical side view showing the molten steel flow velocity distribution at the lower end of the immersion nozzle, FIG. 4 (b) is a chart showing the taper length as the horizontal axis and the central discharge velocity index as the vertical axis, and FIG. FIG. 6 is a vertical sectional side view of a dipping nozzle for continuous casting according to a modified embodiment of the present invention, FIG. 6 is a vertical sectional side view of a prior art lateral discharge nozzle in a mold, and FIG. 7 is a conventional bottom discharge nozzle mold. It is a vertical side view inside. (1) …… immersion nozzle, (2) …… lumen, (3) …… straight part, (4)
...... Lower part, (5) …… Discharge hole, (d) …… Upper lumen diameter, (e)…
… Taper length, (θ) …… taper angle, (C) …… differential flow, (D) …… stagnation part, (x) (y) …… point, (a) (a1) …… immersion nozzle, ( b) ... lumen, (c) (c1) ... discharge hole, (d) ... mold, (e) ... solidification shell, (f) ... meniscus, (g) ...
… Mold powder, (h) …… Powder particles, (A) (A1) …… Molten steel discharge flow, (B) …… Reversed molten steel flow.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 尾上 善則 兵庫県明石市二見町東二見1920 (72)発明者 佐藤 孝彦 兵庫県神戸市垂水区小束山５―11―13 (72)発明者 滝本 豊志 兵庫県神戸市垂水区福田４―６―23 Ｃ― 505 (56)参考文献 特開 昭57−139456（ＪＰ，Ａ) 実公 昭46−23293（ＪＰ，Ｙ１) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshinori Onoue Higashi Futami, Futami-cho, Akashi-shi, Hyogo 1920 (72) Inventor Takahiko Sato 5-11-13 Kozukayama, Tarumi-ku, Kobe-shi, Hyogo (72) Inventor Toyoshi Takimoto Hyogo 4-6-23 Fukuda, Tarumi-ku, Kobe C-505 (56) References JP-A-57-139456 (JP, A) JP-B-46-23293 (JP, Y1)
Claims (1)
おいて、タンディッシュ内溶鋼を鋳型に鋳込む浸漬ノズ
ルのその内腔の形状を、その上部が径ｄの直線状で、そ
の下部が直線状上部につづき下端の吐出孔に向かって拡
がるテーパー状でそのテーパー部の角度θ、テーパー部
の長さｌ、直線状上部の径ｄとの間に、 ｌtanθ ≧０．０８ｄ ｌ ≧ ２ｄ θ ＜ ６゜ の関係を与えて形成されることを特徴とする連続鋳造用
浸漬ノズル。1. In a dipping nozzle in a casting mold for continuous casting of small cross-section cast pieces, the shape of the bore of the dipping nozzle for casting molten steel in a tundish into a casting mold is such that the upper portion is a straight line with a diameter d and the lower portion is It is a taper shape that spreads toward the discharge hole at the lower end following the linear upper part, and between the angle θ of the tapered part, the length l of the tapered part, and the diameter d of the linear upper part, ltan θ ≧ 0.08d l ≧ 2d θ An immersion nozzle for continuous casting, wherein the immersion nozzle is formed by giving a relationship of <6 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62270603A JPH0616930B2 (en) | 1987-10-27 | 1987-10-27 | Immersion nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62270603A JPH0616930B2 (en) | 1987-10-27 | 1987-10-27 | Immersion nozzle for continuous casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01113159A JPH01113159A (en) | 1989-05-01 |
| JPH0616930B2 true JPH0616930B2 (en) | 1994-03-09 |
Family
ID=17488397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62270603A Expired - Lifetime JPH0616930B2 (en) | 1987-10-27 | 1987-10-27 | Immersion nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0616930B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006010231A1 (en) * | 2004-07-29 | 2006-02-02 | Vesuvius Crucible Company | Submerged entry nozzle |
| JP7196746B2 (en) * | 2019-04-11 | 2022-12-27 | 日本製鉄株式会社 | Pouring equipment for continuous casting |
| CN114029463A (en) * | 2021-11-25 | 2022-02-11 | 山东钢铁股份有限公司 | Method for solving segregation of large round billet of special steel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5065910U (en) * | 1973-10-18 | 1975-06-13 | ||
| JPS5436161Y2 (en) * | 1975-08-01 | 1979-11-01 | ||
| JPS57139456A (en) * | 1981-02-23 | 1982-08-28 | Nippon Steel Corp | Long nozzle for continuous casting |
-
1987
- 1987-10-27 JP JP62270603A patent/JPH0616930B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01113159A (en) | 1989-05-01 |
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| EXPY | Cancellation because of completion of term | ||
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