JPH0225965B2 - - Google Patents
Info
- Publication number
- JPH0225965B2 JPH0225965B2 JP11491382A JP11491382A JPH0225965B2 JP H0225965 B2 JPH0225965 B2 JP H0225965B2 JP 11491382 A JP11491382 A JP 11491382A JP 11491382 A JP11491382 A JP 11491382A JP H0225965 B2 JPH0225965 B2 JP H0225965B2
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- inclusions
- adsorption trap
- gas
- inclusion
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
【発明の詳細な説明】
本発明は溶鋼中の非金属介在物を除去する方法
に関し、特に従来技術では除去することが困難で
あつた微小介在物をも除去可能な方法の提案を目
的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing non-metallic inclusions in molten steel, and in particular aims to propose a method capable of removing even minute inclusions that have been difficult to remove using conventional techniques. .
一般に、溶鋼中には脱酸生成物やスラグ、ある
いは溶鋼保持容器内面の内張り用耐火物からの非
金属介在物が多数存在する。これら非金属介在物
は鋼の機械的強度を著しく害するばかりでなく、
製品の表面性をも劣化させるため、取鍋によるガ
スバブリング処理、脱ガス処理あるいはタンデイ
ツシユの使用などにより、極力鋼中介在物を減少
させるように努力されている。 Generally, molten steel contains many deoxidation products, slag, or nonmetallic inclusions from the refractory lining on the inner surface of the molten steel holding container. These nonmetallic inclusions not only significantly impair the mechanical strength of steel, but also
Since they also deteriorate the surface properties of the product, efforts are being made to reduce inclusions in the steel as much as possible by gas bubbling treatment using a ladle, degassing treatment, or the use of a tundish.
しかしながら、最近では鋼材の品質要求の著し
い高度化によつて、前述のような従来法による介
在物の除去程度では充分でなく、特に100μある
いは50μ以下の微小介在物の低減が要求されるよ
うになつているが、従来技術では、そのような微
小介在物の除去能力には限界があり、更に一層強
力な新しい除去方法が望まれている。 However, in recent years, as the quality requirements for steel materials have become significantly more sophisticated, it is no longer sufficient to remove inclusions using the conventional methods described above, and there is a growing demand for the reduction of microscopic inclusions of less than 100μ or 50μ. However, the ability of conventional techniques to remove such minute inclusions is limited, and a new, even more powerful removal method is desired.
本発明はこのような当該技術分野の要望に応
え、かつ従来方法の欠点を克服した新規な、非金
属介在物を直接に吸着除去する方法を提供するも
のであり、その要旨は、溶鋼保持容器の底部より
不活性ガスを吹込み、バブリングで溶鋼中の介在
物を浮上させると共に、その上方の溶鋼中に多孔
質耐火れんが製の介在物吸着捕捉器を浸漬し、そ
の吸着捕捉器の、溶鋼と接触しない側を減圧し
て、溶鋼中を浮上して来た気泡を吸着し、多孔質
れんがの通気性によりガスを通過させ、介在物を
れんが表面に吸着させることによつて、介在物除
去の目的を達成することができた。 The present invention meets the needs of the technical field and provides a new method for directly adsorbing and removing non-metallic inclusions, which overcomes the drawbacks of conventional methods. Inert gas is blown into the bottom of the molten steel to float the inclusions in the molten steel by bubbling, and an inclusion adsorption trap made of porous refractory brick is immersed in the molten steel above. Inclusions are removed by reducing the pressure on the side that does not come into contact with the metal, adsorbing the air bubbles that float up in the molten steel, allowing the gas to pass through the porous brick, and adsorbing the inclusions to the brick surface. was able to achieve its purpose.
次に本発明の詳細について説明する。従来か
ら、溶鋼中の非金属介在物の除去に用いられてい
る技術に、溶鋼保持容器の底部から不活性ガスを
吹込み、溶鋼中の浮遊介在物を浮上させて清浄化
するガスバブリング処理法のあることに着目し、
種々検討・研究を重ねた結果、ガスバブリング処
理によつて浮上する介在物を、その上方の溶鋼中
で多孔性耐火れんがからなるフイルタ機能を有す
る介在物捕捉装置を減圧使用することによつて、
気泡の浮上を促進して、介在物を捕捉除去する効
果を助長することが可能であることを見出した。 Next, details of the present invention will be explained. The gas bubbling treatment method, which has traditionally been used to remove non-metallic inclusions in molten steel, involves blowing inert gas from the bottom of the molten steel holding container to float and clean floating inclusions in molten steel. Focusing on the fact that
As a result of various studies and studies, we have found that by using an inclusion trapping device with a filter function made of porous refractory bricks in the molten steel above the inclusions that float to the surface during the gas bubbling process, we can reduce the pressure.
It has been found that it is possible to enhance the effect of trapping and removing inclusions by promoting the floating of air bubbles.
本発明は、この知見に基づいてなされたもので
あつて、溶鋼浴の上層部に、内部に空隙を設けた
多孔質耐火れんが製の介在物吸着捕捉器を浸漬
し、さらに該溶鋼浴を保持する容器の底部にはガ
ス吹込み用ノズルを設置し、そのノズルから不活
性ガスを溶鋼中に吹き込みながら、介在物吸着捕
捉器が内蔵する空隙部を外部から真空ポンプなど
を使つて減圧状態にする。このようにして、溶鋼
中に浸漬されている上記捕捉器の多孔質れんが部
に、介在物を吸着させて除去する方法であつて、
この発明の方法によつて、従来は除去困難とされ
ていた微小介在物をも吸着除去を可能とし、溶鋼
を清浄化し、機械的特性ならびに製品表面性を向
上させることが出来た。 The present invention was made based on this knowledge, and involves immersing an inclusion adsorption trap made of porous refractory bricks with voids in the upper layer of the molten steel bath, and further holding the molten steel bath. A gas blowing nozzle is installed at the bottom of the container, and while inert gas is blown into the molten steel through the nozzle, the void inside the inclusion adsorption trap is reduced in pressure from the outside using a vacuum pump, etc. do. In this way, inclusions are adsorbed and removed by the porous brick part of the trap that is immersed in molten steel,
The method of the present invention makes it possible to adsorb and remove minute inclusions, which were conventionally considered difficult to remove, to clean molten steel, and to improve mechanical properties and product surface properties.
次に本発明の方法を具体的な実施態様について
詳細に説明する。 Next, specific embodiments of the method of the present invention will be explained in detail.
第１図は介在物吸着捕捉器の１例であつて、こ
の介在物吸着捕捉器９は通気性を有する多孔質耐
火れんが５からなるフイルタ機能を有するもので
あつて、内部には空隙６を包蔵する。また、この
空隙６を減圧した際、溶鋼と接触していない多孔
質耐火れんが部の通気性によるリークを防止する
ためのリーク防止鉄板２、リーク防止モルタル４
および溶鋼８から保護するれんが３が設けられて
いる。そして排気用パイプ１を通じて、ロータリ
ポンプのような真空排気手段７によつて空隙６内
を減圧状態にすると、溶鋼８中の気泡は介在物吸
着捕捉器９の空隙６に至るガス流１８が生じ、気
泡に捕捉された介在物は多孔質耐火れんがのフイ
ルタ機能面５に吸着される。なお第１図におい
て、溶鋼と接触して介在物を捕捉した気泡を吸着
する、フイルタ機能面５以外の多孔質耐火れんが
の部分５′は、必要であれば通常の耐火れんがと
することも可能である。 FIG. 1 shows an example of an inclusion adsorption trap. This inclusion adsorption trap 9 has a filter function and is made of porous refractory bricks 5 having air permeability, and has voids 6 inside. To store. In addition, when the pressure of this void 6 is reduced, a leak-preventing iron plate 2 and a leak-preventing mortar 4 are used to prevent leakage due to the air permeability of the porous refractory bricks that are not in contact with molten steel.
And bricks 3 for protection from molten steel 8 are provided. When the pressure inside the gap 6 is reduced through the exhaust pipe 1 by a vacuum evacuation means 7 such as a rotary pump, the air bubbles in the molten steel 8 generate a gas flow 18 that reaches the gap 6 of the inclusion adsorption trap 9. The inclusions trapped in the air bubbles are adsorbed onto the filter functional surface 5 of the porous refractory brick. In addition, in Fig. 1, the porous refractory brick portion 5' other than the filter functional surface 5, which adsorbs air bubbles that have come into contact with molten steel and trapped inclusions, can be made of ordinary refractory bricks if necessary. It is.
第２図はタンデイツシユ内溶鋼の介在物除去の
実施例であつて、第１図に示す介在物吸着捕捉器
９をタンデイツシユ内の堰１１の間に設置したも
のである。吸着捕捉器９の真下にあたるタンデイ
ツシユの底部には、溶鋼撹拌および介在物捕捉用
ガス吹込みのポーラスプラグれんが１３が設置さ
れている。堰１１を通過した溶鋼流１２はポーラ
スプラグれんが１３から放出された気泡１４によ
つて混合撹拌される。一方では、吸着捕捉器９内
の空隙６は真空ポンプ１０で減圧される。介在物
吸着捕捉器内の空隙６を減圧しつつ、底部よりガ
スバブリングを行なうような状況下での介在物の
捕捉吸着機構を第３図に基づいて説明する。第３
図において、ポーラスプラグれんが１３から溶鋼
中に放出された気泡１５は、非金属介在物が界面
に捕捉された状態で浮上する。そして非金属介在
物を捕捉した気泡は浮上し、介在物吸着捕捉器の
多孔質耐火れんがの溶鋼接触面５に、１６に示す
ような状態で到達する。ここで吸着捕捉器９の内
部の空隙６が減圧状態になつているために、気泡
は多孔質耐火れんが５の通気性によるフイルタ機
能で、ガスとして通過して空隙６に達し、真空ポ
ンプによつて系外に排気され、介在物は多孔質耐
火れんが５の表面に吸着され、１７に示されるよ
うに蓄積されて行く。しかしながら、この蓄積さ
れた介在物層は、介在物が針状で隙間が存在する
状態で吸着されて、介在物間には気孔が連続して
存在するので、吸着機能は低下することなく、タ
ンデイツシユで５連以上の使用が可能である。 FIG. 2 shows an example of removing inclusions from molten steel in a tundish, in which the inclusion adsorption trap 9 shown in FIG. 1 is installed between weirs 11 in the tundish. A porous plug brick 13 for stirring molten steel and blowing gas for capturing inclusions is installed at the bottom of the tundish directly below the adsorption trap 9. Molten steel flow 12 that has passed through weir 11 is mixed and stirred by air bubbles 14 released from porous plug bricks 13. On the one hand, the air gap 6 in the adsorption trap 9 is depressurized by a vacuum pump 10. The mechanism for trapping and adsorbing inclusions under a situation where gas bubbling is performed from the bottom while reducing the pressure in the cavity 6 in the inclusion adsorption trap will be described with reference to FIG. Third
In the figure, bubbles 15 released into the molten steel from the porous plug bricks 13 float to the surface with nonmetallic inclusions trapped at the interface. The bubbles that have captured the nonmetallic inclusions float to the surface and reach the molten steel contact surface 5 of the porous refractory brick of the inclusion adsorption trap in the state shown at 16. Here, since the air gap 6 inside the adsorption trap 9 is in a reduced pressure state, the air bubbles pass through as a gas and reach the air gap 6 due to the filter function due to the air permeability of the porous refractory brick 5, and are pumped by the vacuum pump. The inclusions are then adsorbed onto the surface of the porous refractory brick 5 and accumulated as shown at 17. However, this accumulated inclusion layer is adsorbed in a state where the inclusions are acicular and have gaps, and there are continuous pores between the inclusions, so the adsorption function does not deteriorate and the tundish It is possible to use 5 or more series.
第１図に示した実施例の介在物吸着捕捉器を構
成する多孔質耐火れんが５は、Al2O3−Ｃ系の気
孔率15〜20％の多孔質耐火れんがで、緻密質耐火
れんが３、緻密質モルタル４はAl2O3が90％以
上、気孔率10％以下の高アルミナ系耐火材であつ
て、吸着捕捉器内空隙の真空度は0.1〜0.5Torr程
度が適当である。 The porous refractory brick 5 constituting the inclusion adsorption trap of the embodiment shown in FIG. The dense mortar 4 is a high alumina refractory material with Al 2 O 3 of 90% or more and porosity of 10% or less, and the degree of vacuum in the void inside the adsorption trap is preferably about 0.1 to 0.5 Torr.
第２図において、長さ1000mmの吸着捕捉器９を
タンデイツシユの堰間の上部に設置し、空隙６の
真空度3Torr、処理時間45分／charge、底部吹込
みArガス量は10／min／５プラグ、鋳造速度
1.3ｍ／minで連鋳した結果は、供用した溶鋼の
Total〔Ｏ〕が30ppmであつたものを、ガス吹込
みを行ないつつ連鋳したところ18ppmに低下し
た。またノズル詰り（鋳込速度一定で１チヤージ
当りノズル開度を変更した回数で示す）は、従来
は１チヤージ当り１回程度であつたのが、吸着捕
捉器を使用してガス吹込みを行なわなかつた場合
は0.2回以下であり、ガス吹込みも並行して行な
つた場合にはそれが0.07回（指数）以下であつ
た。 In Fig. 2, an adsorption trap 9 with a length of 1000 mm is installed at the upper part between the weirs of the tundish, the vacuum degree of the gap 6 is 3 Torr, the processing time is 45 minutes/charge, and the amount of Ar gas blown into the bottom is 10/min/5. Plug, casting speed
The result of continuous casting at 1.3m/min is that of the molten steel used in service.
When the total [O] was 30 ppm and continuous casting was performed while blowing gas, it decreased to 18 ppm. In addition, nozzle clogging (indicated by the number of times the nozzle opening degree was changed per charge at a constant casting speed) was conventionally about once per charge, but now gas is blown using an adsorption trap. In the case of no gas injection, it was less than 0.2 times, and when gas injection was performed in parallel, it was less than 0.07 times (index).
以上説明したように、本発明の方法は溶鋼中の
非金属介在物の除去に極めて有効に適用される
が、このような効果は溶鋼の場合に限らず、一般
溶融金属中の非金属介在物の除去に適用して有効
であり、溶融金属の清浄化、延いてはその金属材
の機械的強度を増し、製品の表面性を向上させる
効果は極めて大であることが理解される。 As explained above, the method of the present invention is extremely effectively applied to the removal of non-metallic inclusions in molten steel, but this effect is not limited to molten steel, but also applies to non-metallic inclusions in general molten metal. It is understood that it is effective when applied to the removal of molten metal, and that it is extremely effective in cleaning molten metal, increasing the mechanical strength of the metal material, and improving the surface properties of products.
第１図は本発明の介在物吸着捕捉器の１例を示
す図面、第２図は実施例の説明図、第３図は溶鋼
中の介在物除去の模式的説明図である。
１……排気用パイプ、２……リーク防止鉄板、
３……緻密質耐火れんが、４……緻密質耐火モル
タル、５，５′……多孔質耐火れんが、６……空
隙、７……真空排気手段、８……溶鋼、９……介
在物吸着捕捉器、１０……真空ポンプ、１１……
堰、１２……溶鋼流、１３……ポーラスプラグれ
んが、１４……気泡、１５……浮上気泡、１６…
…多孔質耐火れんが面の気泡、１７……多孔質耐
火れんが面に吸着捕捉された介在物、１８……ガ
ス流。
FIG. 1 is a drawing showing an example of the inclusion adsorption trap of the present invention, FIG. 2 is an explanatory drawing of the embodiment, and FIG. 3 is a schematic illustration of removing inclusions from molten steel. 1...Exhaust pipe, 2...Leak prevention iron plate,
3... Dense refractory brick, 4... Dense refractory mortar, 5,5'... Porous refractory brick, 6... Voids, 7... Vacuum exhaust means, 8... Molten steel, 9... Inclusion adsorption Trap device, 10... Vacuum pump, 11...
Weir, 12... Molten steel flow, 13... Porous plug brick, 14... Bubbles, 15... Floating bubbles, 16...
... Air bubbles on the surface of the porous refractory brick, 17 ... Inclusions adsorbed and captured on the surface of the porous refractory brick, 18 ... Gas flow.
Claims (1)
蔵する多孔質耐火れんが製の介在物吸着捕捉器を
浸漬し、かつ上記溶鋼保持容器の底部にガス吹込
み用ノズルを配設し、該ノズルからガスを溶鋼中
に吹込みながら前記介在物吸着捕捉器の空隙部を
減圧状態にすることによつて、前記介在物吸着捕
捉器に溶鋼中の介在物を吸着させて除去すること
を特徴とする溶鋼中介在物の除去方法。1. An inclusion adsorption trap made of porous refractory brick with built-in voids is immersed in the upper layer of the molten steel bath in the molten steel holding container, and a gas blowing nozzle is provided at the bottom of the molten steel holding container. The inclusions in the molten steel are adsorbed and removed by the inclusion adsorption trap by reducing the pressure in the cavity of the inclusion adsorption trap while blowing gas into the molten steel from a nozzle. A method for removing inclusions in molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11491382A JPS596313A (en) | 1982-07-02 | 1982-07-02 | Removing process for inclusion in molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11491382A JPS596313A (en) | 1982-07-02 | 1982-07-02 | Removing process for inclusion in molten steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS596313A JPS596313A (en) | 1984-01-13 |
| JPH0225965B2 true JPH0225965B2 (en) | 1990-06-06 |
Family
ID=14649761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11491382A Granted JPS596313A (en) | 1982-07-02 | 1982-07-02 | Removing process for inclusion in molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS596313A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103862014B (en) * | 2014-03-25 | 2016-10-12 | 莱芜钢铁集团有限公司 | The purifier of a kind of molten steel inclusion in removing continuous casting production and method of refining |
| CN103862013B (en) * | 2014-03-25 | 2016-02-17 | 莱芜钢铁集团有限公司 | A kind of refining cover for continuous casting production and preparation method thereof |
-
1982
- 1982-07-02 JP JP11491382A patent/JPS596313A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS596313A (en) | 1984-01-13 |
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