JP2021151658A - Molten steel ladle - Google Patents

Molten steel ladle Download PDF

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JP2021151658A
JP2021151658A JP2020052684A JP2020052684A JP2021151658A JP 2021151658 A JP2021151658 A JP 2021151658A JP 2020052684 A JP2020052684 A JP 2020052684A JP 2020052684 A JP2020052684 A JP 2020052684A JP 2021151658 A JP2021151658 A JP 2021151658A
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molten steel
hot water
water contact
contact surface
contact member
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JP7406095B2 (en
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雄一 加藤
Yuichi Kato
雄一 加藤
裕行 井上
Hiroyuki Inoue
裕行 井上
博之 福山
Hiroyuki Fukuyama
博之 福山
匡輝 齋藤
Masaki Saito
匡輝 齋藤
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Nippon Steel Corp
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Nippon Steel Corp
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  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

To improve durability of a molten steel ladle by uniformizing scattering of a molten steel flow colliding with a molten metal touching member to suppress uneven wear of a side wall refractory material.SOLUTION: The molten steel ladle for receiving a molten steel flow poured out from the outlet of a converter comprises: a steel shell constituting an outer shell; a refractory material lining the steel shell to constitute the side wall and the bottom surface of the molten steel ladle; and a molten metal touching member having a molten metal touching surface and disposed at a position where the molten steel flow collides with the bottom surface. The angle of the molten metal touching surface to the molten steel flow is 85°-95°, and the angle of the molten metal touching surface to the bottom surface is over 0°-20°.SELECTED DRAWING: Figure 3

Description

本発明は、溶鋼鍋に関する。 The present invention relates to a molten steel pan.

溶鋼鍋は、鉄皮と、鉄皮に内張りされて側壁および底面を構成する内張り耐火物と、溶鋼を排出する羽口を形成する羽口耐火物と、転炉の出鋼口から注出された溶鋼流が衝突する湯当たり部材とによって構成されている。湯当たり部材は、溶鋼流の衝突による底面耐火物の局部損耗を防止するために配置され、例えば特許文献1に記載されている。一方、溶鋼鍋では、側壁耐火物の損耗による耐用性の低下が課題である。側壁耐火物は、主に溶鋼およびスラグとの反応による溶損によって損耗するため、側壁耐火物を緻密化させ、溶鋼やスラグとの反応を抑制することによる耐用性の向上が図られてきた。例えば、特許文献2には、アルミナセメントのメディアン径を制御することで、キャスタブル耐火物において施工時の混練水分の量を少なくしつつも流動性を維持することができ、得られる側壁耐火物を緻密化する技術が記載されている。 The molten steel pot is poured out from the iron skin, the lining refractory material lined with the iron skin to form the side wall and the bottom surface, the tuyere refractory material forming the tuyere for discharging the molten steel, and the steel outlet of the converter. It is composed of a hot water contact member with which the molten steel flow collides. The hot water contact member is arranged to prevent local wear of the bottom refractory due to the collision of the molten steel flow, and is described in, for example, Patent Document 1. On the other hand, in the molten steel pot, there is a problem that the durability is lowered due to the wear of the side wall refractory. Since the side wall refractory is mainly worn by melting damage due to the reaction with molten steel and slag, the durability has been improved by densifying the side wall refractory and suppressing the reaction with molten steel and slag. For example, in Patent Document 2, by controlling the median diameter of alumina cement, it is possible to maintain the fluidity of a castable refractory while reducing the amount of kneaded water during construction, and obtain a side wall refractory. The technique for densification is described.

特開平5−185202号公報Japanese Unexamined Patent Publication No. 5-185202 特開平10−194849号公報Japanese Unexamined Patent Publication No. 10-194849

しかしながら、耐火物を緻密化することで温度の上下に伴うスポーリングに対する抵抗が下がり、割れやすくなるため、特許文献2に記載されたような技術で溶鋼鍋の耐用性を向上させる効果は限定的であった。一方、本発明者らが溶鋼鍋の側壁耐火物の損耗原因を調査したところ、転炉の出鋼口から注出された溶鋼流が湯当たり部材に衝突したときに不均等に飛散することによって、側壁耐火物に不均等な溶損が生じていることがわかった。 However, by densifying the refractory, the resistance to spalling due to temperature rise and fall decreases and it becomes easy to crack, so the effect of improving the durability of the molten steel pot by the technique described in Patent Document 2 is limited. Met. On the other hand, when the present inventors investigated the cause of wear of the refractory side wall of the molten steel pot, the molten steel flow poured out from the steel outlet of the converter was unevenly scattered when it collided with the hot water contact member. , It was found that uneven melting damage occurred in the side wall refractory.

そこで、本発明は、湯当たり部材に衝突した溶鋼流の飛散を均等化することによって、側壁耐火物の不均等な損耗を抑制し、溶鋼鍋の耐用性を向上させることが可能な溶鋼鍋を提供することを目的とする。 Therefore, the present invention provides a molten steel pan capable of suppressing uneven wear of the side wall refractory and improving the durability of the molten steel pan by equalizing the scattering of the molten steel flow colliding with the hot water contact member. The purpose is to provide.

[1]転炉の出鋼口から注出された溶鋼流を受容する溶鋼鍋であって、外殻を構成する鉄皮と、鉄皮に内張りされて溶鋼鍋の側壁および底面を構成する耐火物と、溶鋼流が底面に衝突する位置に配置され、湯当たり面を有する湯当たり部材とを備え、湯当たり面が溶鋼流に対してなす角度が85°以上95°以下であり、湯当たり面が底面に対してなす角度が0°よりも大きく20°以下である溶鋼鍋。
[2]湯当たり面は、平面または底面とは反対側に膨出した曲面である、[1]に記載の溶鋼鍋。
[3]湯当たり部材は、プレキャストブロックで形成される、[1]または[2]に記載の溶鋼鍋。
[1] A molten steel pot that receives the molten steel flow poured out from the steel outlet of a converter, and has an iron skin that constitutes the outer shell and a refractory that is lined with the iron skin and constitutes the side wall and bottom surface of the molten steel pot. It is provided with an object and a hot water contact member having a hot water contact surface at a position where the molten steel flow collides with the bottom surface, and the angle formed by the hot water contact surface with respect to the molten steel flow is 85 ° or more and 95 ° or less, and the hot water contact A molten steel pan in which the angle between the surface and the bottom is greater than 0 ° and less than 20 °.
[2] The molten steel pan according to [1], wherein the hot water contact surface is a flat surface or a curved surface that bulges on the side opposite to the bottom surface.
[3] The molten steel pan according to [1] or [2], wherein the hot water contact member is formed of a precast block.

上記の構成によれば、湯当たり面が溶鋼流に対してなす角度を適切な範囲に設定することによって、湯当たり面に衝突した溶鋼流の飛散を均等化し、飛散した溶鋼による側壁耐火物の溶損が特定の部位に偏ることを抑制できる。また、湯当たり面が溶鋼鍋の底面に対してなす角度を適切な範囲に設定することによって、底面上を流動する溶鋼による湯当たり部材自体の溶損を抑制し、溶鋼鍋全体の耐用性を高めることができる。 According to the above configuration, by setting the angle formed by the hot water contact surface with respect to the molten steel flow within an appropriate range, the scattering of the molten steel flow colliding with the hot water contact surface is equalized, and the side wall refractory due to the scattered molten steel It is possible to prevent the erosion from being biased to a specific site. In addition, by setting the angle formed by the hot water contact surface with respect to the bottom surface of the molten steel pot within an appropriate range, the melting damage of the hot water contact member itself due to the molten steel flowing on the bottom surface is suppressed, and the durability of the entire molten steel pot is improved. Can be enhanced.

本発明の一実施形態に係る溶鋼鍋の平面図である。It is a top view of the molten steel pot which concerns on one Embodiment of this invention. 図1のII−II線に沿った断面図である。It is sectional drawing along the line II-II of FIG. 図2に示す溶鋼鍋の湯当たり部材を含む部分の拡大図である。It is an enlarged view of the part including the hot water contact member of the molten steel pot shown in FIG. 溶鋼鍋の底面が溶鋼流に対してなす角度を示す図である。It is a figure which shows the angle which the bottom surface of a molten steel pan makes with respect to a molten steel flow.

以下に添付図面を参照しながら、本発明の好適な実施形態について詳細に説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複説明を省略する。 Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

図1は本発明の一実施形態に係る溶鋼鍋の平面図であり、図2は図1のII−II線に沿った断面図である。図示されているように、溶鋼鍋1は、鉄皮2と、パーマネント耐火物3と、ウェア耐火物4と、湯当たり部材5と、羽口6とを含む。溶鋼鍋1は、さらに、溶鋼攪拌用のガスを吹き込むための吹き込み口を含んでもよい。鉄皮2は、溶鋼鍋1の外殻を構成する。パーマネント耐火物3およびウェア耐火物4は鉄皮2に内張りされ、溶鋼鍋1の側壁および底面を構成する。湯当たり部材5は、図2に示すように転炉の出鋼口から注出された溶鋼流7が溶鋼鍋1の底面に衝突する位置に配置される。図示された例において湯当たり部材5はウェア耐火物4に埋め込まれ、溶鋼流7が衝突する湯当たり面5Sを含む部分だけがウェア耐火物4の表面上に現れているが、湯当たり部材5が底面のウェア耐火物4の上に配置されていてもよい。 FIG. 1 is a plan view of a molten steel pan according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. As shown, the molten steel pot 1 includes an iron skin 2, a permanent refractory 3, a ware refractory 4, a hot water contact member 5, and a tuyere 6. The molten steel pan 1 may further include a blow port for blowing a gas for stirring the molten steel. The iron skin 2 constitutes the outer shell of the molten steel pot 1. The permanent refractory 3 and the ware refractory 4 are lined with the iron skin 2 and form the side wall and the bottom surface of the molten steel pot 1. As shown in FIG. 2, the hot water contact member 5 is arranged at a position where the molten steel stream 7 poured out from the steel outlet of the converter collides with the bottom surface of the molten steel pan 1. In the illustrated example, the hot water contact member 5 is embedded in the ware refractory material 4, and only the portion including the hot water contact surface 5S with which the molten steel stream 7 collides appears on the surface of the ware refractory material 4, but the hot water contact member 5 May be placed on the bottom garment refractory 4.

本実施形態において、湯当たり部材5は、例えばアルミナ―マグネシア質の材料を用いたプレキャストブロックで形成される。プレキャストブロックの材料には、アルミナおよびマグネシア骨材に加えて、スピネル、ろう石、けい石、ムライト、カイアナイト、アンダルサイト、ジルコン、ジルコニア、クロム鉱、窒化ケイ素、または酸化クロムなどの耐火骨材を混合してもよい。上記の材料を型枠に鋳込み、養生および乾燥させることによってプレキャストブロックが作製される。 In the present embodiment, the hot water contact member 5 is formed of, for example, a precast block using an alumina-magnesian material. Precast block materials include, in addition to alumina and magnesia aggregates, refractory aggregates such as spinel, pyrophyllite, silicate, mullite, kaianite, andalcite, zircon, zirconia, chromium ore, silicon nitride, or chromium oxide. It may be mixed. Precast blocks are made by casting the above materials into a mold, curing and drying.

図2に示すように、転炉の出鋼口から注出された溶鋼流7は、湯当たり部材5に衝突して飛散する。このときに飛散した溶鋼が側壁を形成するウェア耐火物4に再び衝突することによって、ウェア耐火物4に溶損が生じる。ここで、湯当たり部材5が配置される位置、すなわち溶鋼流7が衝突する位置は溶鋼鍋1の底面の中心ではなく、また溶鋼流7は溶鋼鍋1の底面に対して垂直に衝突するとは限らない。従って、例えば湯当たり面5Sを溶鋼鍋1の底面に対して平行に形成した場合、湯当たり部材5に衝突した溶鋼流7の飛散は不均等になり、例えば湯当たり部材5に近い側の側壁に向けて飛散する溶鋼流が多くなる。より多くの飛散した溶鋼流が衝突する側壁を構成するウェア耐火物4では他の部位よりも早く溶損が進行するため、結果として早期の補修が必要になり、耐用性が低くなる。 As shown in FIG. 2, the molten steel stream 7 poured out from the steel outlet of the converter collides with the hot water contact member 5 and scatters. At this time, the scattered molten steel collides with the ware refractory 4 forming the side wall again, causing melting damage to the ware refractory 4. Here, the position where the hot water contact member 5 is arranged, that is, the position where the molten steel flow 7 collides is not the center of the bottom surface of the molten steel pot 1, and the molten steel flow 7 collides perpendicularly with the bottom surface of the molten steel pot 1. Not exclusively. Therefore, for example, when the hot water contact surface 5S is formed parallel to the bottom surface of the molten steel pot 1, the scattering of the molten steel flow 7 that collides with the hot water contact member 5 becomes uneven, for example, the side wall on the side close to the hot water contact member 5. The amount of molten steel flowing toward is increased. In the ware refractory 4 that constitutes the side wall where more scattered molten steel flows collide, melting damage progresses faster than in other parts, and as a result, early repair is required and the durability is lowered.

本発明者らは、湯当たり部材5に衝突する溶鋼流7の角度が転炉および溶鋼鍋1を含む設備の設計段階で特定可能であるため、溶鋼流7の飛散自体は抑制できなくても、飛散を均等化することによって側壁を構成するウェア耐火物4の溶損が特定の部位に偏らないようにし、それによって例えば上述したような耐火物の緻密化によらずとも耐用性を向上させられることを発見した。この知見に基づく溶鋼鍋1の構成について、さらに説明する。 Since the angle of the molten steel flow 7 that collides with the hot water contact member 5 can be specified at the design stage of the equipment including the converter and the molten steel pot 1, the present inventors can not suppress the scattering of the molten steel flow 7 itself. By equalizing the scattering, the melting damage of the ware refractory 4 constituting the side wall is not biased to a specific part, thereby improving the durability even if the refractory is not densified as described above, for example. I found that it was possible. The configuration of the molten steel pot 1 based on this knowledge will be further described.

図3は、図2に示す溶鋼鍋の湯当たり部材を含む部分の拡大図である。本実施形態では、湯当たり部材5の湯当たり面5Sが溶鋼流7に対してなす角度θが85°以上95°以下であり、湯当たり面5Sが溶鋼鍋1の底面に対してなす角度θが0°よりも大きく20°以下である。転炉の出鋼口から注出された溶鋼流は重力によって自由落下するため、出鋼口における溶鋼流の方向および流速、および出鋼時の転炉と溶鋼鍋1との位置関係がわかれば、湯当たり面5Sに衝突する時点における溶鋼流7の方向が特定でき、湯当たり面5Sが溶鋼流7に対してなす角度θを算出できる。なお、角度θは、溶鋼流7を含む鉛直面内で、溶鋼流7と湯当たり面5Sとの間の転炉側(図2における左側)に形成される角度である。角度θが85°以上95°以下である場合、溶鋼流7は湯当たり面5Sに対して垂直に近い角度で衝突する。従って、湯当たり面5Sに衝突した溶鋼流7の飛散を均等化し、飛散した溶鋼によるウェア耐火物4の溶損が特定の部位に偏らないようにすることができる。 FIG. 3 is an enlarged view of a portion of the molten steel pot shown in FIG. 2 including a hot water contact member. In the present embodiment, the angle θ 1 formed by the hot water contact surface 5S of the hot water contact member 5 with respect to the molten steel flow 7 is 85 ° or more and 95 ° or less, and the angle formed by the hot water contact surface 5S with respect to the bottom surface of the molten steel pot 1. θ 2 is greater than 0 ° and less than 20 °. Since the molten steel flow poured out from the steel outlet of the converter freely falls due to gravity, if the direction and flow velocity of the molten steel flow at the steel outlet and the positional relationship between the converter and the molten steel pot 1 at the time of steel ejection are known. The direction of the molten steel flow 7 at the time of collision with the hot water contact surface 5S can be specified, and the angle θ 1 formed by the hot water contact surface 5S with respect to the molten steel flow 7 can be calculated. The angle θ 1 is an angle formed on the converter side (left side in FIG. 2) between the molten steel flow 7 and the hot water contact surface 5S in the vertical plane including the molten steel flow 7. When the angle θ 1 is 85 ° or more and 95 ° or less, the molten steel stream 7 collides with the hot water contact surface 5S at an angle close to perpendicular to it. Therefore, it is possible to equalize the scattering of the molten steel flow 7 that collides with the hot water contact surface 5S and prevent the melting damage of the ware refractory 4 due to the scattered molten steel from being biased to a specific portion.

ここで、図示された例において湯当たり面5Sは平面であるが、他の例において湯当たり面は溶鋼鍋の底面とは反対側に膨出した曲面であってもよい。この場合、湯当たり面を構成する曲面のうち溶鋼流と衝突する部分において、曲面の接平面が溶鋼流に対してなす角度が85°以上95°以下であり、曲面の接平面が溶鋼鍋1の底面に対してなす角度が0°よりも大きく20°以下である。また、図示された例では湯当たり部材5の上面全体が湯当たり面5Sであるが、他の例では湯当たり部材の上面に湯当たり面以外の面が含まれてもよい。 Here, the hot water contact surface 5S is a flat surface in the illustrated example, but in other examples, the hot water contact surface may be a curved surface that bulges to the side opposite to the bottom surface of the molten steel pot. In this case, the angle formed by the tangent plane of the curved surface with respect to the molten steel flow is 85 ° or more and 95 ° or less in the portion of the curved surface constituting the hot water contact surface that collides with the molten steel flow, and the tangent plane of the curved surface is the molten steel pot 1. The angle formed with respect to the bottom surface of is greater than 0 ° and less than 20 °. Further, in the illustrated example, the entire upper surface of the hot water contact member 5 is the hot water contact surface 5S, but in other examples, the upper surface of the hot water contact member may include a surface other than the hot water contact surface.

多くの場合において溶鋼流7は溶鋼鍋1の底面に対して垂直に衝突しないため、上記のように角度θを設定すると湯当たり面5Sは底面に対して傾斜する(すなわち、角度θが0よりも大きくなる)。一方、湯当たり面5Sの傾斜のために湯当たり部材5の底面からの突出高さが大きくなりすぎると、溶鋼によるスポーリングが発生し、湯当たり部材5の損耗量が大きくなる。そこで、湯当たり面5Sが溶鋼鍋1の底面に対してなす角度θを20°以下にすることによって、溶鋼によるスポーリングが発生し、湯当たり部材5の損耗量が大きくなりすぎるのを防ぎ、湯当たり部材5を含む溶鋼鍋1全体の耐用性を高めることができる。なお、溶鋼鍋1の底面は必ずしも水平ではなく、溶鋼を流動させるために2°程度の傾斜がつけられている場合があるが、その場合は傾斜した底面を基準にして上記の角度θが定義される。 In many cases, the molten steel flow 7 does not collide perpendicularly with the bottom surface of the molten steel pan 1, so when the angle θ 1 is set as described above, the hot water contact surface 5S is inclined with respect to the bottom surface (that is, the angle θ 2 is set. Greater than 0). On the other hand, if the protruding height of the hot water contact member 5 from the bottom surface becomes too large due to the inclination of the hot water contact surface 5S, spalling due to molten steel occurs and the amount of wear of the hot water contact member 5 increases. Therefore, by setting the angle θ 2 formed by the hot water contact surface 5S with respect to the bottom surface of the molten steel pot 1 to 20 ° or less, spalling due to the molten steel occurs and the amount of wear of the hot water contact member 5 is prevented from becoming too large. , The durability of the entire molten steel pot 1 including the hot water contact member 5 can be improved. The bottom surface of the molten steel pan 1 is not necessarily horizontal, and may be inclined by about 2 ° in order to allow the molten steel to flow. In that case, the above angle θ 2 is set with reference to the inclined bottom surface. Defined.

以上で説明したように、本実施形態では、湯当たり面5Sが溶鋼流7に対してなす角度を適切な範囲に設定することによって、湯当たり面5Sに衝突した溶鋼流7の飛散を均等化し、飛散した溶鋼によるウェア耐火物4の溶損が特定の部位に偏らないようにすることができる。また、湯当たり面5Sが溶鋼鍋1の底面に対してなす角度を適切な範囲に設定することによって、底面上を流動する溶鋼による湯当たり部材5の溶損を抑制し、溶鋼鍋1全体の耐用性を高めることができる。 As described above, in the present embodiment, by setting the angle formed by the hot water contact surface 5S with respect to the molten steel flow 7 in an appropriate range, the scattering of the molten steel flow 7 colliding with the hot water contact surface 5S is equalized. , It is possible to prevent the melting damage of the ware refractory 4 due to the scattered molten steel from being biased to a specific portion. Further, by setting the angle formed by the hot water contact surface 5S with respect to the bottom surface of the molten steel pot 1 in an appropriate range, the melting damage of the hot water contact member 5 due to the molten steel flowing on the bottom surface is suppressed, and the entire molten steel pot 1 is suppressed. Durability can be increased.

次に、本発明の実施例について説明する。本実施例では、容量400トンの溶鋼鍋1に湯当たり部材5を配置し、50チャージの操業後にプロフィールメータを用いて側壁の残寸を測定することによってウェア耐火物4の損耗量を評価した。損耗量の評価は、溶鋼鍋1の転炉対向側(図2における右側)の側壁、および転炉側(図2における左側)の側壁のそれぞれで実施した。また、湯当たり部材5についても、10チャージの操業後にプロフィールメータを用いて残寸を測定することによって損耗量を評価した。結果を表1に示す。なお、溶鋼流−底面角度θは溶鋼鍋1の底面が溶鋼流7に対してなす角度(図4参照)であり、この角度と湯当たり面傾斜角度θ、すなわち湯当たり面5Sが底面に対してなす角度との合計が、湯当たり面5Sが溶鋼流7に対してなす角度θになる(θ=θ+θ)。 Next, examples of the present invention will be described. In this embodiment, the hot water contact member 5 is placed in the molten steel pan 1 having a capacity of 400 tons, and the amount of wear of the refractory wear 4 is evaluated by measuring the residual dimension of the side wall using a profile meter after the operation of 50 charges. .. The amount of wear was evaluated on each of the side wall of the molten steel pot 1 on the side facing the converter (right side in FIG. 2) and the side wall on the converter side (left side in FIG. 2). In addition, the amount of wear of the hot water contact member 5 was evaluated by measuring the remaining size using a profile meter after the operation of 10 charges. The results are shown in Table 1. The molten steel flow-bottom surface angle θ 0 is an angle formed by the bottom surface of the molten steel pot 1 with respect to the molten steel flow 7 (see FIG. 4), and this angle and the hot water contact surface inclination angle θ 2 , that is, the hot water contact surface 5S is the bottom surface. The sum of the angle formed with respect to the hot water contact surface 5S is the angle θ 1 formed by the molten steel flow 7 (θ 1 = θ 0 + θ 2 ).

Figure 2021151658
Figure 2021151658

表1において、側壁耐火物の損耗量は、転炉対向側では湯当たり面5Sを溶鋼鍋1の底面に対して平行にした(θ=0)比較例1を基準にして、側壁耐火物の損耗量の減少が10%以上の例を◎、損耗量の減少が10%未満の例を〇、損耗量が減少しなかった例を×と表記している。一方、転炉側では、同じく比較例1を基準にして、側壁耐火物の損耗量の増加が10%未満の例を◎、損耗量の増加が10%以上20%未満の例を〇、損耗量の増加が20%以上の例を×と表記している。湯当たり部材の耐用性は、比較例1に対して湯当たり部材の損耗量の増加が10%未満の例を◎、損耗量の増加が10%以上20%未満の例を〇、損耗量の増加が20%以上の例を×と表記している。 In Table 1, the amount of wear of the side wall refractory is based on Comparative Example 1 in which the hot water contact surface 5S is parallel to the bottom surface of the molten steel pot 1 on the side facing the converter (θ 2 = 0). The case where the amount of wear is reduced by 10% or more is marked with ⊚, the case where the amount of wear is reduced by less than 10% is marked with 〇, and the case where the amount of wear is not reduced is marked with ×. On the other hand, on the converter side, based on Comparative Example 1, an example in which the increase in the amount of wear of the side wall refractory was less than 10% was ⊚, and an example in which the increase in the amount of wear was 10% or more and less than 20% was 〇. An example in which the amount of increase is 20% or more is indicated by x. Regarding the durability of the hot water contact member, the example in which the increase in the amount of wear of the hot water contact member is less than 10% is ◎, the case where the increase in the amount of wear is 10% or more and less than 20% is 〇, and the amount of wear is An example in which the increase is 20% or more is indicated by x.

実施例1〜実施例9では、溶鋼流−底面角度θが80°または76.5°である場合のそれぞれについて、湯当たり面傾斜角度θを5°〜18.5°の範囲で変化させ、溶鋼流−湯当たり面角度θを85°以上95°以下とした。これらの実施例では、転炉対向側の側壁耐火物の損耗量が低減されるとともに、転炉側の側壁耐火物についても損耗量が過大にならず、また湯当たり部材の耐用性も十分であった。 In Examples 1 to 9, the hot water contact surface inclination angle θ 2 is changed in the range of 5 ° to 18.5 ° in each case where the molten steel flow-bottom surface angle θ 0 is 80 ° or 76.5 °. The molten steel flow-hot water contact surface angle θ 1 was set to 85 ° or more and 95 ° or less. In these examples, the amount of wear on the side wall refractory on the side facing the converter is reduced, the amount of wear on the side wall refractory on the converter side is not excessive, and the durability of the hot water contact member is sufficient. there were.

一方、比較例1、比較例2および比較例5では、溶鋼流−湯当たり面角度θをそれぞれ80°、82.5°、81.5°とした結果、転炉対向側の側壁耐火物の損耗量に有意な低減が見られなかった。この結果から、溶鋼流−湯当たり面角度θが85°未満である場合は、転炉対向側への溶鋼流の飛散の偏りが十分に改善されないと考えられる。 On the other hand, in Comparative Example 1, Comparative Example 2 and Comparative Example 5, as a result of setting the molten steel flow-hot water contact surface angle θ 1 to 80 °, 82.5 ° and 81.5 °, respectively, the side wall refractory on the opposite side of the converter No significant reduction was found in the amount of wear. From this result, it is considered that when the molten steel flow-hot water contact surface angle θ 1 is less than 85 °, the unevenness of the molten steel flow scattering toward the converter facing side is not sufficiently improved.

一方、比較例3、比較例4および比較例6では、溶鋼流−湯当たり面角度θをそれぞれ100°、101°、96.5°とした結果、転炉対向側の側壁耐火物の損耗量は低減されたものの、転炉側の側壁耐火物の損耗量が過大になった。この結果から、溶鋼流−湯当たり面角度θが95°を超える場合は、逆に転炉側に溶鋼流の飛散が偏ってしまうと考えられる。 On the other hand, in Comparative Example 3, Comparative Example 4 and Comparative Example 6, as a result of setting the molten steel flow-hot water contact surface angle θ 1 to 100 °, 101 ° and 96.5 °, respectively, the side wall refractory on the opposite side of the converter was worn. Although the amount was reduced, the amount of wear on the side wall refractory on the converter side became excessive. From this result, it is considered that when the molten steel flow-hot water contact surface angle θ 1 exceeds 95 °, the molten steel flow is unevenly scattered toward the converter side.

また、比較例4では、湯当たり面傾斜角度θを21°とした結果、湯当たり部材の損耗量が過大になった。実施例1〜実施例9を含む、湯当たり面傾斜角度θが20°以下の他の例では、湯当たり部材の損耗量は許容範囲内であった。この結果から、湯当たり面傾斜角度θを20°以下とすることによって、湯当たり面を傾斜させても湯当たり部材に十分に耐用性をもたせることができると考えられる。 Further, in Comparative Example 4, as a result of setting the hot water contact surface inclination angle θ 2 to 21 °, the amount of wear of the hot water contact member became excessive. In other examples in which the hot water contact surface inclination angle θ 2 was 20 ° or less, including Examples 1 to 9, the amount of wear of the hot water contact member was within the permissible range. From this result, it is considered that by setting the hot water contact surface inclination angle θ 2 to 20 ° or less, the hot water contact member can be sufficiently durable even if the hot water contact surface is inclined.

以上、添付図面を参照しながら本発明の好適な実施形態について詳細に説明したが、本発明はかかる例に限定されない。本発明の属する技術の分野における通常の知識を有する者であれば、特許請求の範囲に記載された技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、これらについても、当然に本発明の技術的範囲に属するものと了解される。 Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person having ordinary knowledge in the field of technology to which the present invention belongs can come up with various modifications or modifications within the scope of the technical ideas described in the claims. , These are also naturally understood to belong to the technical scope of the present invention.

1…溶鋼鍋、2…鉄皮、3…パーマネント耐火物、4…ウェア耐火物、5…湯当たり部材、5S…湯当たり面、6…羽口、7…溶鋼流。 1 ... molten steel pot, 2 ... iron skin, 3 ... permanent refractory, 4 ... wear refractory, 5 ... hot water contact member, 5S ... hot water contact surface, 6 ... tuyere, 7 ... molten steel flow.

Claims (3)

転炉の出鋼口から注出された溶鋼流を受容する溶鋼鍋であって、
外殻を構成する鉄皮と、
前記鉄皮に内張りされて前記溶鋼鍋の側壁および底面を構成する耐火物と、
前記溶鋼流が前記底面に衝突する位置に配置され、湯当たり面を有する湯当たり部材と
を備え、
前記湯当たり面が前記溶鋼流に対してなす角度が85°以上95°以下であり、
前記湯当たり面が前記底面に対してなす角度が0°よりも大きく20°以下である溶鋼鍋。
A molten steel pan that receives the molten steel flow poured out from the steel outlet of the converter.
The iron skin that makes up the outer shell and
The refractory material lined with the iron skin and forming the side wall and bottom surface of the molten steel pot,
The molten steel stream is arranged at a position where it collides with the bottom surface, and is provided with a hot water contact member having a hot water contact surface.
The angle formed by the hot water contact surface with respect to the molten steel flow is 85 ° or more and 95 ° or less.
A molten steel pan in which the angle formed by the hot water contact surface with respect to the bottom surface is greater than 0 ° and 20 ° or less.
前記湯当たり面は、平面または前記底面とは反対側に膨出した曲面である、請求項1に記載の溶鋼鍋。 The molten steel pan according to claim 1, wherein the hot water contact surface is a flat surface or a curved surface that bulges to the side opposite to the bottom surface. 前記湯当たり部材は、プレキャストブロックで形成される、請求項1または請求項2に記載の溶鋼鍋。 The molten steel pan according to claim 1 or 2, wherein the hot water contact member is formed of a precast block.
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