JP4351607B2 - Slag closing jig and method of using the same - Google Patents
Slag closing jig and method of using the same Download PDFInfo
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- JP4351607B2 JP4351607B2 JP2004311752A JP2004311752A JP4351607B2 JP 4351607 B2 JP4351607 B2 JP 4351607B2 JP 2004311752 A JP2004311752 A JP 2004311752A JP 2004311752 A JP2004311752 A JP 2004311752A JP 4351607 B2 JP4351607 B2 JP 4351607B2
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Description
本発明は、転炉において、精錬の終了した溶鋼を取鍋に出鋼する際にその出鋼末期において転炉内に浮遊するスラグが溶鋼と共に取鍋へ流出するのを抑制するために用いるスラグ閉止治具およびそれを使用したスラグ閉塞治具の使用方法に関するものである。 The present invention relates to a slag used in a converter to suppress the slag floating in the converter at the end of the steel discharge from flowing out into the ladle together with the molten steel when the molten steel after refining is discharged into the ladle. The present invention relates to a closing jig and a method of using a slag closing jig using the same.
転炉炉内に浮遊するスラグは、酸化鉄や酸化リンなどを多く含み、それが取鍋に流出すると、取鍋内溶鋼上に浮遊し、転炉の後工程である二次精錬工程で処理中あるいは処理後に溶鋼と反応し、溶鋼中に酸素やリンが供給されたり、二次精錬を実施しない場合でも連続鋳造までの滞留時間に、やはりスラグと溶鋼とが反応して酸素やリンが溶鋼へ供給される。
リンが溶鋼に供給されると、材質が所定のものにならなかったり、また酸素が供給されると、溶鋼中のＡｌやＴｉなどが酸化されて溶鋼中から浮上分離して、合金添加歩留まりが低下し、あるいは、それによる酸化生成物の発生量が増大し、非金属介在物が増加し、鋼材品質が悪化したり、精錬そのものを不安定にするなど種々の悪影響を与える。
The slag floating in the converter furnace contains a large amount of iron oxide, phosphorus oxide, etc., and when it flows into the ladle, it floats on the molten steel in the ladle and is treated in the secondary refining process, which is the latter process of the converter. It reacts with the molten steel during or after treatment, and oxygen or phosphorus is supplied to the molten steel, or even if secondary refining is not performed, the slag and molten steel react with each other during the residence time until continuous casting, and oxygen and phosphorus are molten. Supplied to.
When phosphorus is supplied to the molten steel, the material does not become a predetermined one, or when oxygen is supplied, Al, Ti, etc. in the molten steel are oxidized and levitated and separated from the molten steel, resulting in an alloy addition yield. Decrease or increase in the amount of oxidized products generated thereby, non-metallic inclusions increase, and the steel material quality deteriorates, and the refining itself becomes unstable.
従って、転炉から溶鋼を出鋼する際には、転炉内スラグが取鍋内に流出しないように様々な工夫がなされている。例えば、［特許文献１］に開示されているようなスラグカット装置がある。本装置は、転炉の出鋼孔に、所謂スラグダーツと称するスラグ閉塞器を挿入してスラグの流出を遮断するスラグカット装置である。本装置によると、短時間でかつ確実にスラグ閉塞器を出鋼孔内に挿入でき、しかも、挿入後、遠隔操作によってスラグ閉塞器を取り外すことができるというものである。
しかし、転炉の出鋼孔は、通常耐火煉瓦からなり使用回数の少ない新品の間は、所定の効果があるものの、出鋼回数を重ね、出鋼孔が溶損し、孔径が大きくなってくると、前記スラグ閉塞器によって安定して転炉からのスラグ流出を抑制することは困難であった。出鋼孔の径が大きくなると、出鋼所要時間が短くなり、転炉スラグの鍋内への流入によって、出鋼中に投入する合金の歩留がばらつくなどの弊害も出てくる。 However, the steel outlet hole of the converter is usually made of refractory bricks, and there is a predetermined effect during the new use with a small number of times of use, but the number of times of steel output is repeated, the steel outlet hole melts and the hole diameter becomes large And it was difficult to suppress the slag outflow from a converter stably by the slag blocker. When the diameter of the steel output hole is increased, the time required for steel output is shortened, and the inflow of the converter slag into the pan causes variations in the yield of the alloy to be introduced into the steel output.
このため従来は、出鋼回数が進み、出鋼孔が溶損し孔径が大きくなってくると、出鋼孔を補修し、あるいは補修も限界に至ると、出鋼孔煉瓦を新品と交換していた。出鋼孔補修や出鋼孔煉瓦交換の作業を行うには、転炉を休止する必要がある。例えば、出鋼孔の交換には約１時間を要する。この休止時間を極力減少し、転炉の稼働率が低下することなく、しかも転炉から流出するスラグ量を抑制し、且つ、転炉の出鋼所要時間を安定化するための手段が強く要望されていた。 For this reason, in the past, when the number of steel exits progressed, the steel outlet holes melted and the hole diameter increased, the steel outlet holes were repaired, or when repairs reached the limit, the steel outlet hole bricks were replaced with new ones. It was. It is necessary to suspend the converter in order to carry out the work of repairing the steel outlet holes and replacing the bricks of the steel outlet holes. For example, it takes about 1 hour to replace the outgoing steel holes. There is a strong demand for a means to reduce this downtime as much as possible, to suppress the slag flow out of the converter without lowering the operating rate of the converter, and to stabilize the time required for steelmaking of the converter. It had been.
本発明者らは休止時間となる出鋼孔補修や出鋼孔煉瓦交換の回数を減らすために、出鋼回数が進んで出鋼孔が大きくなっても、転炉スラグの流出を抑制し、且つ、出鋼時間を安定化する方法を検討した。
本発明によるスラグ閉止治具は、図１に示すように、上部が笠状で下部が棒状からなる所謂ダーツ形状を基本とする。そして、その棒状部に太径の部分を有する。加えて、その太径部分の径と、その下端から当該治具が転炉内溶鋼に挿入されたときのスラグと溶鋼との界面位置までの距離を出鋼孔径によって決めたものである。
このことにより、出鋼孔の溶鋼の流出する有効面積を一定化し、且つ、当該治具の作用するタイミングを最適にしようというものである。
In order to reduce the number of times of exit steel hole repair and exit steel hole brick exchange that becomes the downtime, the present inventors suppress the outflow of the converter slag even if the output steel hole number is increased and the output steel hole is enlarged, And the method of stabilizing steeling time was examined.
As shown in FIG. 1, the slag closing jig according to the present invention is based on a so-called dart shape in which the upper part has a shade shape and the lower part has a rod shape. And it has a large diameter part in the rod-shaped part. In addition, the diameter of the large diameter portion and the distance from the lower end to the interface position between the slag and the molten steel when the jig is inserted into the molten steel in the converter are determined by the diameter of the outgoing steel hole.
Thus, the effective area through which the molten steel flows out of the steel outlet hole is made constant, and the timing at which the jig acts is optimized.
その要旨は、特許請求の範囲に記載した通りの
（１）転炉出鋼時に出鋼孔に挿入することにより転炉内スラグの流出を抑制するためのスラグ閉止治具であって、当該治具の形状が、上部が傘状で下部が棒状の所謂ダーツ型で且つ当該棒状部をその下部よりも太径とし、該棒状部の下端が前記出鋼孔上端より下方に位置し、前記出鋼孔の溶鋼の流出する有効面積が一定となるように前記出鋼孔が溶損によりその内径が大きくなるに従い前記棒状部の太径部分の径を大きくし、且つ、その太径部分の下端から転炉内溶鋼とスラグとの界面位置までの長さを長くしたことを特徴とするスラグ閉止治具、
（２）上記（１）記載のスラグ閉止治具を複数種類保有しておき、前記出鋼孔径、あるいは、出鋼孔の使用回数に応じて当該複数種類のスラグ閉止治具を使い分けることを特徴とするスラグ閉止治具の使用方法、
である。
The gist of the present invention is (1) a slag closing jig for suppressing the outflow of slag in a converter by inserting it into a steel output hole at the time of steel output from the converter. The shape of the tool is a so-called dart shape in which the upper part is umbrella-shaped and the lower part is rod-shaped, and the bar-shaped part has a diameter larger than that of the lower part, and the lower end of the bar-shaped part is located below the upper end of the output steel hole, The diameter of the large-diameter portion of the rod-shaped portion is increased as the inner diameter of the outgoing steel hole is increased due to melting so that the effective area of the molten steel flowing out of the steel hole is constant, and the lower end of the large-diameter portion A slag closing jig, characterized in that the length from the molten steel in the converter to the interface position between the slag is increased,
(2) A plurality of types of slag closing jigs described in the above (1) are held, and the plurality of types of slag closing jigs are selectively used in accordance with the diameter of the outgoing steel holes or the number of times the outgoing steel holes are used. How to use the slag closing jig
It is.
即ち、本発明者らが鋭意検討した結果次のようなことが判明した。
図２は、出鋼孔の径とスラグが流出し始める転炉内溶鋼のレベルを著している。図からもわかるように出鋼孔の径が大きくなると、出鋼時間ももちろん短くなるが、更には、スラグが渦流に巻き込まれて、取鍋に流出し始める転炉内溶鋼レベルが高いうちから流出し始める。このことは、出鋼孔の径が大きいときは、単に治具の径を太くするのみでは不十分であり、その太径部分を長くし、スラグ流出防止を早いタイミングで作用させる必要があることを示している。
That is, as a result of intensive studies by the present inventors, the following has been found.
FIG. 2 shows the diameter of the steel outlet hole and the level of molten steel in the converter where the slag begins to flow out. As can be seen from the figure, when the diameter of the tapping hole increases, the tapping time is of course shortened, but moreover, the slag is entrained in the vortex and the molten steel in the converter starts to flow out into the ladle. It begins to flow out. This means that when the diameter of the steel hole is large, it is not enough to simply increase the diameter of the jig, and it is necessary to lengthen the large diameter part and to prevent slag outflow at an early timing. Is shown.
図２によると出鋼孔の径が新品のＸ１の時が溶鋼レベルＹ１からスラグが流出し始めるし、出鋼孔が溶損し、孔径がＸ２になった場合、溶鋼高さＹ２からスラグが流出し始めることがわかる。
従って、本発明のスラグ閉止治具は、出鋼孔径に応じて閉止治具の出鋼孔に挿入される太径の部分の径を変化させるのみではなく、その太径部分の下端から転炉内スラグ溶鋼界面位置までの長さも変化させることを特徴としている。
It When the diameter of the tapping hole according to FIG 2 is X 1 a new start to slag flows out the molten steel level Y 1, tapping hole is melting, if the pore diameter becomes X 2, molten steel height Y 2 It can be seen that slag begins to flow out.
Therefore, the slag closing jig of the present invention not only changes the diameter of the large diameter portion inserted into the exit steel hole of the closing jig according to the exit steel hole diameter, but also converts the converter from the lower end of the large diameter portion. The length to the interface position of the inner slag molten steel is also changed.
本発明を適用することにより、転炉から取鍋へ出鋼する際に、出鋼孔の補修や出鋼孔煉瓦交換回数を低減し、それによる休止時間を低減すると同時に、そのときの出鋼孔にあったスラグ閉塞治具を使用することにより、スラグ流出を抑制し、しかも出鋼時間をほぼ一定化することが可能で、品質面でも転炉や二次精錬の操業面でも安定化するという多大な効果を奏するものである。 By applying the present invention, when steel is output from the converter to the ladle, the number of repairs of the steel output holes and the number of times the bricks are replaced is reduced, thereby reducing the downtime and at the same time the steel output at that time By using the slag closing jig in the hole, it is possible to suppress slag outflow and to make the time of steel output almost constant, stabilizing both in terms of quality and operation of the converter and secondary refining. This is a great effect.
図３は、本発明に係るスラグ閉止治具の種々の実施の態様を示したものである。
（ａ）は、図１にも示したように、本発明の基本的な形状のものである。
（ｂ）は、笠部にスリットをいれたもの
（ｃ）は、棒状部の太径部下端に傾斜を設けたものである。
勿論、本発明に係るスラグ閉止治具は、図示の態様に限ることなく、これらの任意の組合せ形状、或いは同様の機能を果たすものであれば、他の適宜の形状のものを採用し得る。
FIG. 3 shows various embodiments of the slag closing jig according to the present invention.
(A) is the basic shape of the present invention as shown in FIG.
(B) is a cap with a slit.
(C) provides a slope at the lower end of the large-diameter portion of the rod-like portion.
Needless to say, the slag closing jig according to the present invention is not limited to the illustrated embodiment, and any other suitable combination shape or any other suitable shape can be adopted as long as it has a similar function.
本発明を実際の２４０トン転炉に適用した場合の結果を説明する。
出鋼孔径に応じて表１のように３種類のスラグ閉止治具を用意し、出鋼孔が溶損し、径が大きくなるに従い、閉止治具も径の大きな、且つ、その太径部の長い閉止治具に切り替えていった。その結果が図４である。図４の実線が本発明による閉止治具の適用結果を示す。破線は従来の閉止治具を使用した時の出鋼時間の推移を示している。尚、溶損した出鋼孔の径は、当該孔断面積を同一面積の真円とした場合の径とした。
The results when the present invention is applied to an actual 240-ton converter will be described.
As shown in Table 1, three types of slag closing jigs are prepared according to the diameter of the outgoing steel hole. As the outgoing steel hole melts and becomes larger in diameter, the closing jig becomes larger in diameter and has a larger diameter. I switched to a long closing jig. The result is shown in FIG. The solid line in FIG. 4 shows the application result of the closing jig according to the present invention. The broken line shows the transition of the steeling time when a conventional closing jig is used. The diameter of the melted steel hole was the diameter when the hole cross-sectional area was a perfect circle of the same area.
図４のように、従来は出鋼時間が当初６分から３分までばらついていたが、本発明の適用により６分から５分までと出鋼孔１炉代を通じて非常に安定した出鋼時間が得られた。また、取鍋内のスラグ厚みも全て３０ｍｍ前後と安定して混入スラグ量を低減できた。 As shown in FIG. 4, in the past, the steel output time varied from 6 minutes to 3 minutes in the beginning, but by applying the present invention, a very stable steel output time was obtained from 6 minutes to 5 minutes and through one furnace hole. It was. Moreover, the slag thickness in the ladle was all about 30 mm, and the amount of mixed slag could be reduced.
Claims (2)
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| JP2004311752A JP4351607B2 (en) | 2004-10-27 | 2004-10-27 | Slag closing jig and method of using the same |
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| CN105274275A (en) * | 2015-11-06 | 2016-01-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for reducing rephosphorization during semi-steel steelmaking |
| CN105296702A (en) * | 2015-11-06 | 2016-02-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for increasing yield of semi-steel steelmaking Si alloy |
| CN108823353A (en) * | 2018-06-05 | 2018-11-16 | 马鞍山利尔开元新材料有限公司 | A kind of company's shuttle valve system of high life |
| CN115044736B (en) * | 2022-06-16 | 2023-06-09 | 莱芜钢铁集团银山型钢有限公司 | Converter tapping hole with argon blowing function and whole-course slag blocking method |
| CN115786630B (en) * | 2022-11-09 | 2024-07-16 | 河钢乐亭钢铁有限公司 | Method and equipment for accurately throwing slag stopping mark and feeding back information for converter |
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