JPS63180350A - Continuous casting method for molten steel - Google Patents
Continuous casting method for molten steelInfo
- Publication number
- JPS63180350A JPS63180350A JP1135887A JP1135887A JPS63180350A JP S63180350 A JPS63180350 A JP S63180350A JP 1135887 A JP1135887 A JP 1135887A JP 1135887 A JP1135887 A JP 1135887A JP S63180350 A JPS63180350 A JP S63180350A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- ladle
- lid
- molten
- tundish
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 85
- 239000010959 steel Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000009749 continuous casting Methods 0.000 title claims description 10
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 abstract description 17
- 238000005266 casting Methods 0.000 abstract description 16
- 230000007547 defect Effects 0.000 abstract description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000011109 contamination Methods 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 238000012443 analytical study Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000002436 steel type 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
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/001—Retaining slag during pouring molten metal
- B22D43/002—Retaining slag during pouring molten metal by using floating means
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、取鍋内溶鋼の湯面に浮上している不純物の
混入による欠陥のない鋳片を、歩留シよく鋳造すること
ができる、溶鋼の連続鋳造方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] This invention makes it possible to cast slabs with a high yield without defects due to the inclusion of impurities floating on the surface of molten steel in a ladle. , relates to a continuous casting method for molten steel.
溶鋼の連続鋳造方法では、通常、次のようにして溶鋼を
鋳片に連続鋳造している。In continuous casting methods for molten steel, molten steel is usually continuously cast into slabs in the following manner.
即ち、取鍋内に収容した溶鋼を取鍋の底壁に設けられた
ノズルを通ってタンディツシュ内に注入し、タンディツ
シュ内に注入した溶鋼をタンディツシュの底壁に設けら
れたノズルを通ってモールド内に注入して、モールド内
で溶鋼に凝固シェルを生成させ、かくして得られる未凝
固鋳片をモールド内から引抜くことにより、溶鋼を鋳片
て連続的に鋳造する。That is, the molten steel stored in the ladle is injected into the tundish through a nozzle provided on the bottom wall of the ladle, and the molten steel injected into the tundish is poured into the mold through the nozzle provided on the bottom wall of the tundish. The molten steel is poured into slabs to form a solidified shell in the mold, and the unsolidified slabs thus obtained are pulled out of the mold, thereby continuously casting the molten steel into slabs.
ところで、従来の連続鋳造方法では、第６図に示すよう
に、取鍋１内の溶ｆ４２に対して、取鍋１の蓋３によっ
て保温を行なっているだけで、鋳造の進行に伴なって取
鍋１内の溶鋼２に自由渦が発生するのを防止するように
はなっていなかった。By the way, in the conventional continuous casting method, as shown in Fig. 6, the molten f42 in the ladle 1 is simply kept warm by the lid 3 of the ladle 1, and as the casting progresses, It was not designed to prevent the generation of free vortices in the molten steel 2 in the ladle 1.
このため、取鍋１内の溶鋼２の湯面２ ’ａに浮上して
いる不純物４が、鋳造の進行に伴なって溶鋼２内に巻込
まれ、不純物４を混入した溶ｇ９４２がノズル５を通っ
てメンディツシュ内に注入され、そしてモールド内に注
入されてしまうので、不純物４の混入による欠陥のない
鋳片を鋳造するためには、かなり多量の溶＃２を取鍋ｌ
内に残したまま、タンディツシュへの溶鋼２の注入を中
止しなければならなかった。従って、従来の連続鋳造方
法では、し片の鋳造歩留Ｑが低かった。Therefore, the impurities 4 floating on the surface 2'a of the molten steel 2 in the ladle 1 are drawn into the molten steel 2 as casting progresses, and the molten g942 mixed with the impurities 4 enters the nozzle 5. Therefore, in order to cast a slab without defects due to contamination with impurities, a considerably large amount of molten #2 must be poured into the ladle.
The injection of molten steel 2 into the tandish had to be stopped while the steel remained in the tank. Therefore, in the conventional continuous casting method, the casting yield Q of strips was low.
従って、この発明は、上述の現状に鑑み、鋳造の進行に
伴なって取鍋内の溶鋼に自由渦が発生するのを防止して
、取鍋内の溶鋼の湯面に浮上している不純物が溶鋼内に
混入されるのを阻止し、かくして、不純物の混入による
欠陥のない鋳片を歩留シよ〈鋳造することができるよう
にした、溶鋼の連続鋳造方法を提供することを目的とす
るものである。Therefore, in view of the above-mentioned current situation, this invention prevents the generation of free vortices in the molten steel in the ladle as casting progresses, and prevents impurities floating on the surface of the molten steel in the ladle. It is an object of the present invention to provide a method for continuous casting of molten steel, which prevents contamination of molten steel from being mixed into the molten steel, and thus enables casting of slabs without defects caused by contamination of impurities with a high yield. It is something to do.
本発明者等は、鋳造の進行に伴なって取鍋内の溶鋼に自
由渦が発生するのを防止して、取鍋内の溶鋼の湯面に浮
上している不純物の混入による欠陥のない鋳片を、歩留
シよく鋳造さぜるべぐ、自由渦の発生、成長に関して、
以下のように解析的検討を行なった。The present inventors have developed a method to prevent the generation of free vortices in the molten steel in the ladle as casting progresses, thereby eliminating defects caused by the contamination of impurities floating on the surface of the molten steel in the ladle. Regarding the generation and growth of free vortices, when casting slabs with good yield,
An analytical study was conducted as follows.
取鍋内の溶鋼を取鍋底壁のノズルを通ってタンディツシ
ュ内へ注入するｉ合、取鍋内の溶鋼は初め取鍋底壁の出
鋼口近傍から逐次ノズルの内孔内に流出していたのが、
鋳造の進行に伴なって取鍋内の溶鋼に自由渦が発生する
と、取鍋内の溶鋼の湯面には湯面だけを伝わってノス°
ルの内孔内に流出する流線が表われ、湯面の溶鋼がノズ
ルの内孔内に流出することが生ずる。このため、溶鋼の
湯面に浮上していた不純物が湯面の溶鋼と一緒にノス°
ルの内孔内に流出して、混入することが生ずる。When the molten steel in the ladle is injected into the tundish through the nozzle on the bottom wall of the ladle, the molten steel in the ladle first flows out successively into the inner hole of the nozzle from near the tapping port on the bottom wall of the ladle. but,
When a free vortex is generated in the molten steel in the ladle as casting progresses, nozzles are generated on the surface of the molten steel in the ladle through only the molten metal surface.
Stream lines flowing into the inner hole of the nozzle appear, and the molten steel at the surface of the molten metal flows into the inner hole of the nozzle. For this reason, the impurities that had floated to the surface of the molten steel are mixed with the molten steel on the surface of the molten steel.
This can lead to leakage and contamination into the inner bore of the tube.
取鍋内の流動する溶鋼の湯面の形を決める要因は、次の
２つである。The following two factors determine the shape of the surface of flowing molten steel in the ladle.
（１）力学的要因
第１図に示すように、溶鋼２の湯面２ａ直上の大気圧舶
−１、−湯面２政に′おける溶鋼２の静水圧ｆｆ：Ｐ
５ ｓその密度をρ、その速２度をＶ１湯面２ａの曲率
半径をＲとすると、湯面２ａにおける遠心方と圧力のバ
ランスよシ、次式が成立つ。(1) Mechanical factors As shown in Fig. 1, the hydrostatic pressure ff of the molten steel 2 at the atmospheric pressure vessel 1 and 2' directly above the molten metal surface 2a of the molten steel 2 is: P
5sIf the density is ρ, the speed 2 degrees is V1, and the radius of curvature of the hot water surface 2a is R, then the following equation holds true for the centrifugal and pressure balance at the hot water surface 2a.
Ｐｃｏ＋−Ｐｓ＝ρＶ２／Ｒ
即ち、溶鋼２の湯面２ａを水平にすることは、湯面２ａ
の曲率半径Ｒを無限大にすることでらシ、そうすると上
記式よシ大気圧Ｐｔｘ＝＝静水圧Ｐ８となるので、湯面
２ａに自由渦が発生することを防ぐことになる。Pco+-Ps=ρV2/R In other words, making the surface 2a of the molten steel 2 horizontal means
By making the radius of curvature R infinite, then according to the above equation, atmospheric pressure Ptx==hydrostatic pressure P8, which prevents free vortices from occurring on the hot water surface 2a.
（２）運動学的要因
第２図に示すように、ある時刻ｔにおける水平方向位置
ｘ、ｙでの湯面２ａの鉛直方向位置２を、次の関数で表
わすとする。(2) Kinematic factors As shown in FIG. 2, the vertical position 2 of the hot water surface 2a at the horizontal positions x and y at a certain time t is expressed by the following function.
ｆ （Ｘｓ ｙ＋ ｚ、’ｊ）＝＝Ｑ
この湯面２ａは、Ｘｓ ｙ＊ Ｚおよびｔに関して連続
であるから、微少時刻Δを後も湯面（微少時刻Δを後の
湯面を２ ａ’で表わす）であシ続けるためＫは、溶鋼
２０Ｘ ｔ ７ ＋ Ｚ方向の流速を各々ｕ、 ｖ。f (Xs y+ z,'j)==Q Since this hot water level 2a is continuous with respect to Xs y*Z and t, the hot water level after the minute time Δ (the hot water level after the minute time Δ ), K is the molten steel 20X t 7 + the flow velocity in the Z direction is u, v, respectively.
Ｗとすると、湯面２ａ上の点Ｐ（ｘ、 ７＋ ｚ）に位
置する溶銅２は、微少時刻Δｔ゛後には湯面２ ａ’上
の点Ｑ （ｘ十ｕΔｔ、ｙ十ｖΔｔ、ｚ十ｗΔｔ）に位
置することから、次の式が成立てばよい。Assuming W, the molten copper 2 located at point P (x, 7 + z) on the hot water surface 2a will move to the point Q (x0uΔt, y0vΔt, z 10wΔt), the following equation should hold true.
ｆ（ｘ＋ｕΔｔ、ｙ＋ｖΔｔ１ ｚ十ｗΔ１． １＋Δ
１）＝０上式の左辺を書き変えると、
ｆ（ｘ＋ｕΔｔ 、ｙ十ｖΔｔ、ｚ＋ｗΔ１，１＋Δｔ
）’ ａｔ ａｆ ａｆ ａｆ
＝＝ｆ（ｘ、ｙ、ｚ、ｔ）十Δｔ（−” ｆｉｘ ｕ十
ａ ｙ ｖ”Ｆｉ” ）十〇（Δを勺ここで、上式の右
辺第１項のｆ （Ｘｓ Ｌ Ｚ＋ ｔ）は零でちゃ、右
辺第３項のθ（Δｔ２ ）は間欠の微小項で零と見做せ
るから、ｆＣｘ＋ｕ社、ｙ十ｖΔｔ、ｚ十ＷΔ１，１＋
Δｔ） ＝ｏとなるためには、右辺第２項ａｆ θｆ
ａｆ ａｆ
の括弧内の式、Ｂ 、 ＋Ｔｃｕ ＋ Ｂ、 ｖ ＋Ｗ
ｗが零になればよい。前項（１）であげた溶鋼２の＠酊
２ａを水平に保つことは、この条件をも満す。従って、
湯面２ａは微少時刻Δを後に湯面２ ａ′に変化するが
、湯面であシ続け、湯面２ａ上の点Ｐ （Ｘｓ ｙ＊
Ｚ ）に位置する溶鋼２は、微少時刻Δを後に湯面２
ａ’上の点Ｑ（ｘ十ｕΔｔ、ｙ＋ｖΔｔ、ｚ＋ｗΔｔ
）に位置するが、湯面上にあり続ける。f(x+uΔt, y+vΔt1 z ten wΔ1. 1+Δ
1)=0 Rewriting the left side of the above equation, f(x+uΔt, y+vΔt, z+wΔ1,1+Δt
)' at af af af ==f(x, y, z, t) 1Δt(-" fix u0a y v"Fi") 10(Δ)Here, the first term on the right side of the above equation f (Xs L Z+ t) should be zero, and the third term on the right side, θ (Δt2), is an intermittent minute term and can be regarded as zero, so fCx + u company, y + v Δt, z + W Δ1, 1 +
In order to satisfy Δt) = o, the second term on the right side af θf
Formula in parentheses of af af, B, +Tcu + B, v +W
It is sufficient if w becomes zero. Keeping the molten steel 2 @ 2a horizontal as mentioned in the previous section (1) also satisfies this condition. Therefore,
The hot water surface 2a changes to the hot water surface 2a' after a minute time Δ, but it continues to touch the hot water surface, and a point P (Xs y*
The molten steel 2 located at Z
Point Q on a' (x0uΔt, y+vΔt, z+wΔt
), but it remains above the hot water level.
以上の（１１，（２１から、取鍋内の溶鋼の湯面を強制
的に水平に保つ蓋（以下、制動蓋と称す）ｆ、浮かせる
ことは、取鍋内の溶鋼に自由渦が発生するのを防止して
、取鍋内の溶鋼の湯面に浮上している不純物が湯面の溶
鋼と一緒にノズルの内孔内に流出して混入することを防
ぐのに効果があることが判った。従って、不、細物の混
入による欠陥のない鋳片を歩留りよく鋳造することがで
きる。From the above (11, (21), the lid (hereinafter referred to as the braking lid) that forcibly keeps the level of the molten steel in the ladle horizontal f, floating creates a free vortex in the molten steel in the ladle It has been found to be effective in preventing impurities floating on the surface of the molten steel in the ladle from flowing into the inner hole of the nozzle together with the molten steel on the surface. Therefore, it is possible to cast slabs with a high yield without defects due to the inclusion of fine particles.
この発明は、上記知見に基づきなされたもので、この発
明の溶鋼の連続鋳造方法は、取鍋内に収容した溶鋼ヲタ
ンディッシュを介してモールド内に注入して、前記溶鋼
を鋳片に連続鋳造するにあたフ、前記取鍋内の前記溶鋼
上に予め耐熱性の蓋からなる制動蓋を浮かべて、前記制
動蓋によシ前記取鍋内の前記溶鋼に自由渦が発生するの
を防止しながら、前記取鍋内の前記溶鋼を前記タンディ
ツシュを介して前記モールド内に注入することに特徴を
有するものである。This invention has been made based on the above findings, and the continuous casting method of molten steel of the present invention is such that the molten steel is continuously poured into a slab by injecting the molten steel into a mold through a molten steel dish housed in a ladle. Before casting, a brake lid made of a heat-resistant lid is floated on the molten steel in the ladle in advance to prevent the generation of free vortices in the molten steel in the ladle due to the brake lid. The present invention is characterized in that the molten steel in the ladle is injected into the mold through the tundish while preventing the molten steel from being injected into the mold.
取鍋同浴鋼上に浮かべる制動蓋の満すべき要件は、次の
通りである。The requirements that the brake lid floating on the steel ladle must meet are as follows:
（１）蓋の全体としての比重が溶鋼よシも小さいこと。(1) The specific gravity of the lid as a whole is smaller than that of molten steel.
（２）蓋が溶鋼湯面に浮上している不純物と反応しない
こと。(2) The lid should not react with impurities floating on the surface of the molten steel.
（３；蓋の予熱を考慮して熱容量が小さいこと。(3; Heat capacity is small considering preheating of the lid.
（４）蓋は取鍋内張クレンガンｔ−損傷しない形状を有
すること。(4) The lid must have a shape that will not damage the ladle lining.
（５）蓋は取鍋の底面よシも大きくては不可であるが、
保温性を前照して溶鋼湯面をなるべく広く覆うことがで
きる大きさとする。例えば、取鍋の底面の径の８割以上
の径を有する大きさの蓋とすること。(5) The lid cannot be larger than the bottom of the ladle.
With heat retention in mind, the size should be such that it can cover as much of the molten steel surface as possible. For example, the lid should have a diameter that is 80% or more of the diameter of the bottom of the ladle.
（６）蓋の消耗部分が極めて安価であること。(6) The consumable parts of the lid are extremely inexpensive.
（７）取扱いの便宜が企れるだけの強度を蓋がもっこと
。(7) The lid should be strong enough to facilitate handling.
ｒＸ３図は、この発明で用いる制動蓋の１例を示す部分
切欠き斜視図である。制御蓋６は、シャーレ形の調製器
７の凹側面にアルミナキャスタグル８を鋳込んだ構造を
しており、調製器７によって構造強度を持たせ、アルミ
ナキャスタブル８側を溶鋼接触凹側として耐熱性を持た
せている。調製器７の凹側面には突起（トンが）９を設
けて、アルミナキャスダル８を固定する。また、調製器
７の周囲には、制動蓋６の運搬用の吊りフレーム１０を
取付ける。制動蓋６の直径は取鍋の底面の径の８割以上
である。Figure rX3 is a partially cutaway perspective view showing an example of the brake lid used in the present invention. The control lid 6 has a structure in which alumina castagle 8 is cast into the concave side of a petri dish-shaped preparer 7, and the preparer 7 provides structural strength, and the alumina castable 8 side is set as the concave side that comes in contact with molten steel, making it heat resistant. It has a sexuality. A protrusion 9 is provided on the concave side surface of the preparer 7 to fix the alumina caster 8 thereon. Further, around the regulator 7, a hanging frame 10 for transporting the brake lid 6 is attached. The diameter of the brake lid 6 is 80% or more of the diameter of the bottom surface of the ladle.
この発明では、このような制動蓋６を、第４図に示すよ
うに、取鍋１内の溶鋼２上に予め浮かべて、しかる後に
、溶鋼２を取鍋１からノズル５を通って図示しないタン
ディツシュ内に注入し、そして、タンディツシュからそ
のノズルを通ってモールド内に注入し、溶鋼２を鋳片に
連続鋳造する。In this invention, such a brake lid 6 is floated in advance on the molten steel 2 in the ladle 1, as shown in FIG. 4, and then the molten steel is passed from the ladle 1 through the nozzle 5 (not shown). The molten steel 2 is injected into a tundish, and from the tundish through its nozzle and into a mold to continuously cast the molten steel 2 into a slab.
このとき、取鍋ｌ内で溶鋼２上に制動蓋６を浮かべてい
るために、鋳造が進行しても取鍋１内の溶鋼２に自由渦
が発生するのが制動蓋６により防止されるので、取鍋１
内の溶鋼２はその湯面２ａに浮上している不純物４を巻
込んで混入させることす＜、ノズル５ｆ：通ってタンデ
ィツシュ内に注入され、そして、モールド内に注入され
る。従って、モールドにおいて不純物４の混入による欠
陥のないυＪ片が得られる。また、取鍋１内の溶鋼２を
取鍋１内に多鰍に残すことなく鋳造できるので、歩留シ
がよい。At this time, since the brake lid 6 is floating above the molten steel 2 in the ladle l, the brake lid 6 prevents the generation of free vortices in the molten steel 2 in the ladle 1 even if the casting progresses. So, ladle 1
The molten steel 2 is injected into the tundish through the nozzle 5f, and is then injected into the mold so as to entrain and mix impurities 4 floating on the molten metal surface 2a. Therefore, a υJ piece without defects due to the inclusion of impurity 4 in the mold can be obtained. Further, since the molten steel in the ladle 1 can be cast without leaving many molten steel in the ladle 1, the yield is good.
この発明に従い、２５０トン取鍋内溶鋼上に、先の第３
図に示した制動蓋６と同様な制動蓋（厚み３０ｃｒｒＩ
、直径３０００ ｃｍ （取鍋底面の直径３７００ｍの
約８割））を予め浮かべて、制動蓋によシ取鍋内溶鋼に
自由渦が発生するのを防止しながら溶鋼をタンディツシ
ュ内に注入し、そしてメンディツシュからモールド内に
注入して鋳片を連続鋳造し友。連続鋳造機は１０．５ｍ
Ｒの彎曲型連続鋳造機で、鋳造速度は１．２ ｍ／ｍｉ
ｎ 、鋼種は低炭素アルミキルド鋼であった。鋳造は溶
鋼を取鍋内に１０トン残した状態で終えた。また、比較
のために、従来法通り、２５０トン取鍋内溶鋼上に制動
蓋を浮かべないで、上記と同様にして、鋳片を連続鋳造
した。According to this invention, the above-mentioned third
A brake cover similar to the brake cover 6 shown in the figure (thickness: 30crrI)
, diameter 3000 cm (approximately 80% of the diameter 3700 m at the bottom of the ladle)) was floated in advance, and the molten steel was poured into the tundish while preventing the generation of free vortices in the molten steel in the ladle through the brake lid. The slab is then continuously cast by pouring it into the mold. Continuous casting machine is 10.5m
R curved continuous casting machine, casting speed is 1.2 m/mi
n, the steel type was low carbon aluminum killed steel. Casting was completed with 10 tons of molten steel remaining in the ladle. For comparison, slabs were continuously cast in the same manner as described above without floating the brake lid on the molten steel in a 250-ton ladle as in the conventional method.
このとき得られた鋳片の後方側部分に観察され九スラグ
性欠陥（不純物の混入による欠陥）の指数を、第５図に
示す。FIG. 5 shows the index of nine slag defects (defects due to contamination of impurities) observed in the rear part of the slab obtained at this time.
第５図に示されるように、本発明法においては、取鍋内
済鋼上に浮かべた制動蓋によシ溶鋼に自由渦が発生する
のを防止しているので、溶鋼の湯面に浮上している不純
物の混入による、鋳片のスラグ性欠陥が、従来法と比べ
て著しく少なくなってい。As shown in Figure 5, in the method of the present invention, the braking lid floating on the steel in the ladle prevents the generation of free vortices in the molten steel, so it floats on the surface of the molten steel. The number of slag defects in slabs due to the contamination of impurities is significantly reduced compared to the conventional method.
る。Ru.
以上説明したように、この発明によれば、不純物の混入
による欠陥のない鋳片を歩留りよく鋳造することができ
る。As explained above, according to the present invention, slabs free of defects due to contamination with impurities can be cast with a high yield.
第１図は、取鍋内の流動する溶鋼の湯面の形を決める力
学的要因を説明するための説明図、第２図は、同じく運
動学的要因を説明するための説明図、第３図は、この発
明で用いる制動蓋の１例を示す部分切欠き斜視図、第４
図は、この発明の鋳造方法における取鍋内の様子を示す
断面図、Ｋ５図は、この発明の方法および従来法によっ
て鋳造された鋳片のスラグ性欠陥指数を示すグラフ、第
６図は、従来の鋳造方法における取鍋内の様子を示す断
面図である。図面において、
】・・・取鍋、 ２・・・溶鋼。
２ａ・・・湯面、 ３・・・蓋、４・・・不
１４ 物、 ｓ・・・ノズル、６・・・制
動蓋、 ７・・・鋼表面、８・・・アルミナ
キャスタブル、
９・・・突起、 １０・・・吊シフレー
ム。Figure 1 is an explanatory diagram for explaining the mechanical factors that determine the shape of the surface of flowing molten steel in the ladle, Figure 2 is an explanatory diagram for also explaining the kinematic factors, and Figure 3 is an explanatory diagram for explaining the kinematic factors. The figure is a partially cutaway perspective view showing one example of the brake lid used in the present invention.
The figure is a cross-sectional view showing the inside of the ladle in the casting method of the present invention, Figure K5 is a graph showing the slag defect index of slabs cast by the method of the present invention and the conventional method, and Figure 6 is FIG. 2 is a cross-sectional view showing the inside of a ladle in a conventional casting method. In the drawings, 】...Ladle, 2... Molten steel. 2a... Hot water surface, 3... Lid, 4... Non-14 object, s... Nozzle, 6... Brake lid, 7... Steel surface, 8... Alumina castable, 9. ...Protrusion, 10...Hanging frame.
Claims (1)
ド内に注入して、前記溶鋼を鋳片に連続鋳造するにあた
り、 前記取鍋内の前記溶鋼上に予め耐熱性の蓋からなる制動
蓋を浮かべて、前記制動蓋により前記取鍋内の前記溶鋼
に自由渦が発生するのを防止しながら、前記取鍋内の前
記溶鋼を前記タンディッシュを介して前記モールド内に
注入することを特徴とする、溶鋼の連続鋳造方法。[Claims] When pouring molten steel contained in a ladle into a mold via a tundish to continuously cast the molten steel into slabs, heat-resistant A brake lid consisting of a lid is floated, and the molten steel in the ladle is introduced into the mold through the tundish while preventing the generation of free vortices in the molten steel in the ladle with the brake lid. A method for continuous casting of molten steel, characterized by injection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1135887A JPS63180350A (en) | 1987-01-22 | 1987-01-22 | Continuous casting method for molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1135887A JPS63180350A (en) | 1987-01-22 | 1987-01-22 | Continuous casting method for molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63180350A true JPS63180350A (en) | 1988-07-25 |
Family
ID=11775805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1135887A Pending JPS63180350A (en) | 1987-01-22 | 1987-01-22 | Continuous casting method for molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63180350A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001088209A1 (en) * | 2000-05-17 | 2001-11-22 | Tetron, Inc. | Method and apparatus for delivering metallurgically improved molten metal |
| US7169349B1 (en) | 2000-05-17 | 2007-01-30 | Tetron, Inc. | Method and apparatus for delivering metallurgically improved molten metal |
| JP2011230193A (en) * | 2011-06-21 | 2011-11-17 | Tetron Inc | Method for supplying metallurgically improved molten metal |
-
1987
- 1987-01-22 JP JP1135887A patent/JPS63180350A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001088209A1 (en) * | 2000-05-17 | 2001-11-22 | Tetron, Inc. | Method and apparatus for delivering metallurgically improved molten metal |
| US7169349B1 (en) | 2000-05-17 | 2007-01-30 | Tetron, Inc. | Method and apparatus for delivering metallurgically improved molten metal |
| JP2011230193A (en) * | 2011-06-21 | 2011-11-17 | Tetron Inc | Method for supplying metallurgically improved molten metal |
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