JPH0528542U - Long nozzle for continuous casting - Google Patents
Long nozzle for continuous castingInfo
- Publication number
- JPH0528542U JPH0528542U JP2145691U JP2145691U JPH0528542U JP H0528542 U JPH0528542 U JP H0528542U JP 2145691 U JP2145691 U JP 2145691U JP 2145691 U JP2145691 U JP 2145691U JP H0528542 U JPH0528542 U JP H0528542U
- Authority
- JP
- Japan
- Prior art keywords
- tip
- long nozzle
- nozzle
- continuous casting
- tapered
- 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
Landscapes
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
(57)【要約】 （修正有）
【目的】 タンディッシュ内の溶鋼に浸漬される連続鋳
造用ロングノズル先端部は厳しい熱衝撃条件にさらさ
れ、割れや欠損などによる耐用性の低下がみられるの
で、その改良を図る。
【構成】 連続鋳造用ロングノズルの先端部外周を先細
り状形状とし、この先細り形状は円錐形、凸状曲面又は
凸状多角形（何れも縦断面からみて）等であり、この先
細り状部分の先端角度（θ）を該ロングノズルの軸線に
対して２０〜７５°とし、更に先細り状形状の該ノズル
軸方向長さ（Ｈ）が２０〜４００ｍｍとするのが好適で
ある。その結果ロングノズル先端部の亀裂発生、欠損が
減少され、耐用寿命の延命が達成される。
(57) [Summary] (Modified) [Purpose] The long nozzle tip for continuous casting, which is immersed in molten steel in the tundish, is exposed to severe thermal shock conditions, and its durability deteriorates due to cracking and chipping. So, we will improve it. [Structure] The outer periphery of the tip of the long nozzle for continuous casting has a tapered shape, and the tapered shape is a conical shape, a convex curved surface, a convex polygonal shape (all viewed from a vertical cross section), or the like. It is preferable that the tip angle (θ) is 20 to 75 ° with respect to the axis of the long nozzle, and the tapered axial length (H) of the nozzle is 20 to 400 mm. As a result, cracking and chipping at the tip of the long nozzle are reduced, and the service life is extended.
Description
【０００１】[0001]
本考案は連続鋳造用ロングノズルの改良に関する。 The present invention relates to improvement of a long nozzle for continuous casting.
【０００２】[0002]
周知の如く鋼の連続鋳造方式においては取鍋からタンディッシュへ溶鋼を注入 するに当り、断気鋳造を行うためにロングノズルが使用されている。これらロン グノズルは長尺パイプ状のもので、上部は取鍋の下ノズル（シュートノズル）に セットするために本管部より太くフランジ状として支持可能な構造としてある。 一方タンディッシュ内の溶鋼に浸漬されるノズル先端部は管体を水平に切断した 形状としてある。 As is well known, in the continuous casting method of steel, a long nozzle is used to perform open casting when pouring molten steel from a ladle into a tundish. These long nozzles are in the form of long pipes, and the upper part is thicker than the main part and can be supported as a flange so that it can be set as the lower nozzle (shoot nozzle) of the ladle. On the other hand, the tip of the nozzle immersed in the molten steel in the tundish has the shape of a horizontally cut tube.
【０００３】[0003]
この種のロングノズルは数チャージから数１０チャージ分の溶鋼の注入に使用 され、各チャージ毎に冷却されるので、タンディッシュ内の溶鋼に浸漬されるロ ングノズル先端部は厳しい熱衝撃条件にさらされる。このため、先端部の割れや 欠損などにより耐用性が低下し、又鋼品質にも悪影響を及ぼす。また、ロングノ ズル先端部に付着したスラグや地金は冷却固化時に収縮する。ロングノズルの冷 却は内部より外表面の方が先行するために、付着した地金やスラグはロングノズ ル先端部を締めつけ先端部の亀裂発生や欠損を助長し耐用性低下の原因となる。 本考案者等は前述のような従来品の欠点を改善し、ロングノズルの耐用性を延 命するため種々検討、実験の結果本考案の開発に成功したものであり、本考案の 技術的構成は連続鋳造用ロングノズルの先端部外周を先細り状形状とし、この先 細り状形状は円錐形（図１及び４）、凸状曲面（図２及び５）又は凸状多角形（ 図３）（何れも縦断面からみて）等であり、先端部の熱的、機械的応力集中およ びスラグや地金の付着を抑制するものである。この先細り状部分の先端角度（θ ）を該ロングノズルの軸線に対して２０〜７５°とし、更に先細り状形状の該ノ ズル軸方向長さ（Ｈ）を２０〜４００ｍｍとするのが好適である。 This type of long nozzle is used to inject molten steel from several charges to several tens of charges and is cooled for each charge, so the tip of the long nozzle immersed in the molten steel in the tundish is exposed to severe thermal shock conditions. Be done. Therefore, the durability is deteriorated due to cracking or chipping of the tip, and the steel quality is also adversely affected. In addition, the slag and metal that adhere to the tip of the long nozzle contract when it cools and solidifies. Since the outer surface of the long nozzle cools earlier than the inner surface, the adhered metal or slag tightens the tip of the long nozzle, which promotes cracking and chipping of the tip, which reduces durability. The present inventors have succeeded in developing the present invention as a result of various studies and experiments in order to improve the drawbacks of the conventional products as described above and prolong the durability of the long nozzle. Has a tapered shape on the outer circumference of the tip of a long nozzle for continuous casting, and this tapered shape has a conical shape (FIGS. 1 and 4), a convex curved surface (FIGS. 2 and 5) or a convex polygonal shape (FIG. 3). (When viewed from the longitudinal section), etc., which suppresses thermal and mechanical stress concentration at the tip and adhesion of slag and metal. It is preferable that the tip angle (θ) of the tapered portion is 20 to 75 ° with respect to the axis of the long nozzle, and the length (H) of the tapered shape in the nozzle axial direction is 20 to 400 mm. is there.
【０００４】 前記先細り状部分の先端角度（θ）をロングノズルの軸線に対して２０〜７５ °の範囲としたのは２０°未満では下端部の応力緩和が不充分である。７５°を 超えると外周弯曲部の応力緩和が不充分となるとともに先端部へのスラグや地金 の付着抑制効果も不充分となる。更に、先細り状部分の軸方向長さはロングノズ ル先端部の肉厚が１０ｍｍ以上あることが好ましく、１０ｍｍ未満では先端部の 強度や侵食性が不足し、耐用上好ましくない。The reason why the tip angle (θ) of the tapered portion is set in the range of 20 to 75 ° with respect to the axis of the long nozzle is that stress relaxation at the lower end is insufficient if the angle is less than 20 °. If it exceeds 75 °, the stress relaxation of the curved outer circumference becomes insufficient, and the effect of suppressing the adhesion of slag and metal to the tip becomes insufficient. Further, the axial length of the tapered portion is preferably such that the wall thickness of the tip of the long nozzle is 10 mm or more, and if it is less than 10 mm, the strength and erosion of the tip are insufficient, which is not preferable in terms of durability.
【０００５】 図４及び図５に示す本考案品の例において、ロングノズル肉厚４５ｍｍの場合 の先端面平坦状の従来品と本考案品との発生熱応力を、従来品を指数１００とし て対比した結果を図６のグラフで示す。このグラフから本考案品の熱応力の発生 が図示の如く減少され、従って耐用性１０％前後増大されることが認められる。In the example of the present invention shown in FIGS. 4 and 5, when the long nozzle wall thickness is 45 mm, the thermal stress generated between the conventional product with the flat tip surface and the present product is set to 100 for the conventional product. The comparison result is shown in the graph of FIG. From this graph, it can be seen that the occurrence of thermal stress in the product of the present invention is reduced as shown in the figure, and therefore the durability is increased by about 10%.
【０００６】[0006]
（１）ロングノズル先端部への地金及びスラグの付着が抑制され、亀裂発生、 欠損が減少し、耐用寿命が従来品に比し１．５倍以上に向上された。 (1) Adhesion of metal and slag to the tip of the long nozzle was suppressed, cracking and chipping were reduced, and the service life was improved 1.5 times or more compared to the conventional product.
【０００７】 （２）初めての使用時に予熱なし又は僅かな予熱によって熱衝撃による亀裂の の発生が抑制された。(2) The occurrence of cracks due to thermal shock was suppressed by no preheating or slight preheating at the time of first use.
【図１】先端部形状が円錐形の本考案ロングノズルの縦
断面図。FIG. 1 is a vertical sectional view of a long nozzle of the present invention having a conical tip.
【図２】先端部形状が凸状曲面の本考案ロングノズルの
縦断面図。FIG. 2 is a vertical cross-sectional view of a long nozzle of the present invention having a convex curved surface at the tip.
【図３】先端部形状が凸状多角形の本考案ロングノズル
の縦断面図。FIG. 3 is a vertical sectional view of a long nozzle of the present invention having a convex polygonal tip.
【図４】図１の先端部分縦断面図。FIG. 4 is a vertical cross-sectional view of the tip portion of FIG.
【図５】図２の先端部分縦断面図。5 is a vertical cross-sectional view of the tip portion of FIG.
【図６】従来品と本考案品との熱応力発生状態を示すグ
ラフ。FIG. 6 is a graph showing the thermal stress generation states of the conventional product and the device of the present invention.
θ 先細り状部分の先端角度 Ｈ 先細り状形状の軸方向長さ θ Tip angle of tapered portion H Axial length of tapered shape
Claims (2)
ズル先端部の外周を先細り状としたことを特徴とする連
続鋳造用ロングノズル。1. A long nozzle for continuous casting, characterized in that the outer periphery of the nozzle tip portion is tapered.
は凸状多角形であり、該先細り状部分の先端角度（θ）
が該ロングノズルの軸線に対して２０〜７５°である請
求項１記載の連続鋳造用ロングノズル。2. The tapered shape is a conical shape, a convex curved surface or a convex polygon, and the tip angle (θ) of the tapered portion.
Is 20 to 75 ° with respect to the axis of the long nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2145691U JPH0528542U (en) | 1991-04-03 | 1991-04-03 | Long nozzle for continuous casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2145691U JPH0528542U (en) | 1991-04-03 | 1991-04-03 | Long nozzle for continuous casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0528542U true JPH0528542U (en) | 1993-04-16 |
Family
ID=12055474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2145691U Pending JPH0528542U (en) | 1991-04-03 | 1991-04-03 | Long nozzle for continuous casting |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0528542U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011189382A (en) * | 2010-03-15 | 2011-09-29 | Kurosaki Harima Corp | Long nozzle |
| JP2011189381A (en) * | 2010-03-15 | 2011-09-29 | Kurosaki Harima Corp | Long nozzle |
| JP2012091235A (en) * | 2012-02-15 | 2012-05-17 | Kurosaki Harima Corp | Nozzle for continuous casting |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6150999A (en) * | 1977-11-15 | 1986-03-13 | スロウン−ケタリング インステイテユ−ト フオア カンサ− リサ−チ | Manufacture of pentapeptide composition and intermediate polypeptide |
-
1991
- 1991-04-03 JP JP2145691U patent/JPH0528542U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6150999A (en) * | 1977-11-15 | 1986-03-13 | スロウン−ケタリング インステイテユ−ト フオア カンサ− リサ−チ | Manufacture of pentapeptide composition and intermediate polypeptide |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011189382A (en) * | 2010-03-15 | 2011-09-29 | Kurosaki Harima Corp | Long nozzle |
| JP2011189381A (en) * | 2010-03-15 | 2011-09-29 | Kurosaki Harima Corp | Long nozzle |
| JP2012091235A (en) * | 2012-02-15 | 2012-05-17 | Kurosaki Harima Corp | Nozzle for continuous casting |
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