JPH0226922Y2 - - Google Patents
Info
- Publication number
- JPH0226922Y2 JPH0226922Y2 JP1985018202U JP1820285U JPH0226922Y2 JP H0226922 Y2 JPH0226922 Y2 JP H0226922Y2 JP 1985018202 U JP1985018202 U JP 1985018202U JP 1820285 U JP1820285 U JP 1820285U JP H0226922 Y2 JPH0226922 Y2 JP H0226922Y2
- Authority
- JP
- Japan
- Prior art keywords
- ladle
- gas
- lance
- molten steel
- lid
- 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
- 239000007789 gas Substances 0.000 claims description 31
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 239000011888 foil Substances 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000161 steel melt Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は受鋼前の取鍋内雰囲気をアルゴンガス
に置換するための装置に関し、詳しくは精錬され
た溶鋼を取鍋に受鋼する際、該溶鋼が空気と接触
して起きる品質劣化等を防止するための装置に関
するものである。
（従来の技術）
溶鋼、特にTi等を多量に含む溶鋼は、出鋼時
取鍋内の空気によつて吸窒あるいは酸化されて非
金属介在物が発生し、鋳造時のノズル詰り、鋳片
の偏析などの原因となる。
受鋼前の取鍋内雰囲気を窒素ガスで置換し、受
鋼時における溶鋼の吸窒等を防止する方法とし
て、特開昭57−181320号が公知である。この方法
は、取鍋内にドライアイスを投入した後に受鋼す
ることによつて溶鋼の吸窒を抑制するものであ
る。しかしこの方法は簡単である反面、CO，
CO2によつて溶鋼中の〔Ｃ〕，〔O2〕が上昇すると
いう欠点があり、ステンレス鋼などの高級鋼には
適用できない。
（考案が解決しようとする問題点）
本考案は受鋼前の取鍋内雰囲気をアルゴンガス
（以下、Arガスと記す）に置換することにより、
受鋼時における溶鋼の吸窒、酸化などを抑制する
とともにこの置換を効率よく行うことを目的とす
る。
（問題点を解決するための手段）
本考案は取鍋の上部を取鍋蓋で覆うとともに該
取鍋蓋を貫通して取鍋内に挿入されたランスから
アルゴンガスを吹込むための装置であつて、該ラ
ンスは周方向および長さ方向に複数のガス吐出口
を備え、該取鍋蓋はアルミ箔で覆われた溶鋼導入
口を備えていることを特徴とする取鍋内雰囲気の
アルゴンガス置換装置にある。
以下図面により本考案を詳述する。
第１図〜第３図は本考案の実施例を示し、２は
取鍋、３は取鍋蓋、４は横孔ランスである。
横孔ランス４は長さ方向および周方向に複数の
ガス吐出口が設けられ、上端は継手６でフレキシ
ブルホース７に接続している。取鍋蓋３には芯板
８よび梁板９（第２図）が設けられ、該芯板８の
上面および下面には耐火物１０が張り付けられて
おり、熱応力による反りを防止している。
第２図において１１は溶鋼導入口に設置された
アルミ箔で、該アルミ箔１１にはArガス置換時
における取鍋内空気を排出するための切欠孔１２
が設けられている。アルミ箔１１は、枠体１３に
張り付けられ、該枠体１３は係止部材（図示せ
ず）によつて取鍋蓋３に固定されている。１４は
ランス挿入孔、１５はシール材である。
（作用）
第３図において予熱を完了した取鍋２に取鍋蓋
３を装着するとともにランス挿入孔１４から横孔
ランス４を挿入し、間隙部をシール材で塞ぐ。次
にArガス供給源（図示せず）からArガスをフレ
キシブルホース７継手６を通して横孔ランス４に
供給する。Arガスは各ガス吐出口５（第１図）
から取鍋内に吐出するとともにArガスよりも比
重の小さい空気は切欠孔１２（第２図）から排出
される。ガス吐出口５は取鍋内全域に向けて設け
られているためArガスは取鍋内に均等かつ迅速
に供給され、取鍋内の空気は速やかにArガスに
置換され予熱された取鍋の温度降下を最少限に抑
えることができる。
Arガスに置換後、横孔ランス４を取鍋２内に
挿入したままの状態で受鋼する。これは該ランス
を取り出すとランス挿入孔１４から外気が侵入す
るためである。
受鋼に際しては、溶鋼導入口のアルミ箔１１と
炉１６の出鋼口とを位置決めした後、アルミ箔１
１に向けて出鋼すると溶鋼はアルミ箔１１を溶解
し取鍋内に導入される。取鍋内はArガスが充満
されているため取鍋内での溶鋼の酸化、吸窒が抑
制される。受鋼後、Al箔１１の溶損した取鍋蓋
３を鋳造用の取鍋蓋（図示せず）と交換し鋳造を
行う。
なおガス吐出口５をランス周方向あるいは長さ
方向に実施例よりもさらに多数設けることによ
り、Arガスを一層迅速かつ均等に吐出すること
が可能である。
（考案の効果）
第１表は取鍋内雰囲気のArガス置換において、
本考案および比較例として第５図に示した装置を
用いて各々25チヤージについてArガスを流速６
m3／分で供給した後、受鋼した場合の結果を平均
値で示し、第４図は各ガス置換における代表例を
示す。本考案は比較例と比べて出鋼前から出鋼後
における溶鋼中〔N2〕の上昇が1/2以下となり、
また出鋼後の〔N2〕，〔O2〕も著しく低減してい
る。これにより非金属介在物による注入ノズルの
詰りが解消し、また溶鋼の清浄度が向上した。ま
たArガス置換の所要時間も1/2〜1/5に短縮可能
となり、Arガス吹込量の節減および取鍋の温度
降下を小さくできた。
【表】[Detailed description of the invention] (Industrial application field) This invention relates to a device for replacing the atmosphere in a ladle with argon gas before receiving steel. , relates to a device for preventing quality deterioration caused by contact of the molten steel with air. (Prior art) Molten steel, especially molten steel containing a large amount of Ti, etc., is nitrified or oxidized by the air in the ladle during tapping, and non-metallic inclusions are generated, resulting in nozzle clogging during casting and slabs. This can cause segregation, etc. Japanese Patent Laid-Open No. 181320/1983 is a known method for replacing the atmosphere in the ladle with nitrogen gas before receiving steel to prevent nitrification of molten steel during receiving. This method suppresses nitrification of molten steel by charging dry ice into a ladle and then receiving the steel. However, while this method is simple, CO,
It has the disadvantage that [C] and [O 2 ] in the molten steel increase due to CO 2 , so it cannot be applied to high-grade steels such as stainless steel. (Problems to be solved by the invention) This invention replaces the atmosphere inside the ladle with argon gas (hereinafter referred to as Ar gas) before receiving the steel.
The purpose is to suppress nitrification, oxidation, etc. of molten steel during steel receiving, and to efficiently perform this replacement. (Means for Solving the Problems) The present invention is a device for covering the upper part of a ladle with a ladle lid and for blowing argon gas from a lance inserted into the ladle through the ladle lid. , the lance is equipped with a plurality of gas discharge ports in the circumferential direction and the length direction, and the ladle lid is equipped with a molten steel inlet covered with aluminum foil, argon gas replacement of the atmosphere inside the ladle. It's in the device. The present invention will be explained in detail below with reference to the drawings. 1 to 3 show an embodiment of the present invention, in which 2 is a ladle, 3 is a ladle lid, and 4 is a horizontal hole lance. The horizontal hole lance 4 is provided with a plurality of gas discharge ports in the length direction and the circumferential direction, and its upper end is connected to a flexible hose 7 through a joint 6. The ladle lid 3 is provided with a core plate 8 and a beam plate 9 (Fig. 2), and a refractory 10 is pasted on the upper and lower surfaces of the core plate 8 to prevent warping due to thermal stress. . In Fig. 2, reference numeral 11 denotes an aluminum foil installed at the molten steel inlet, and the aluminum foil 11 has notched holes 12 for discharging the air inside the ladle during Ar gas replacement.
is provided. The aluminum foil 11 is pasted on a frame 13, and the frame 13 is fixed to the ladle lid 3 by a locking member (not shown). 14 is a lance insertion hole, and 15 is a sealing material. (Function) In FIG. 3, the ladle lid 3 is attached to the preheated ladle 2, and the horizontal hole lance 4 is inserted through the lance insertion hole 14, and the gap is closed with a sealing material. Next, Ar gas is supplied from an Ar gas supply source (not shown) to the horizontal hole lance 4 through the flexible hose 7 and the joint 6. For Ar gas, each gas outlet 5 (Fig. 1)
Air, which has a specific gravity lower than that of the Ar gas, is discharged from the notch hole 12 (FIG. 2). Since the gas discharge port 5 is provided to face the entire area inside the ladle, Ar gas is supplied evenly and quickly into the ladle, and the air inside the ladle is quickly replaced with Ar gas and the preheated ladle is heated. Temperature drop can be minimized. After replacing the gas with Ar gas, the horizontal hole lance 4 is received while being inserted into the ladle 2. This is because outside air enters through the lance insertion hole 14 when the lance is taken out. When receiving steel, after positioning the aluminum foil 11 at the molten steel inlet and the tapping port of the furnace 16,
1, the molten steel melts the aluminum foil 11 and is introduced into the ladle. Since the inside of the ladle is filled with Ar gas, oxidation and nitrification of the molten steel inside the ladle are suppressed. After receiving the steel, the ladle cover 3 in which the Al foil 11 has been melted is replaced with a ladle cover (not shown) for casting, and casting is performed. By providing a larger number of gas discharge ports 5 in the circumferential or longitudinal direction of the lance than in the embodiment, it is possible to discharge Ar gas more quickly and evenly. (Effects of the idea) Table 1 shows that when replacing the atmosphere inside the ladle with Ar gas,
As an example of the present invention and a comparative example, using the apparatus shown in Fig. 5, Ar gas was applied at a flow rate of 6 for 25 charges each.
The results obtained when steel was received after being supplied at a rate of m 3 /min are shown as average values, and FIG. 4 shows typical examples for each gas replacement. In the present invention, the increase in [N 2 ] in molten steel from before to after tapping is less than 1/2 compared to the comparative example.
In addition, [N 2 ] and [O 2 ] after tapping were also significantly reduced. This eliminated clogging of the injection nozzle caused by non-metallic inclusions and improved the cleanliness of the molten steel. In addition, the time required for Ar gas replacement can be shortened to 1/2 to 1/5, reducing the amount of Ar gas blown and reducing the temperature drop in the ladle. 【table】
第１図、第２図、第３図イ，ロ，ハは本考案の
実施例を示す図、第４図は取鍋内雰囲気のArガ
ス換における取鍋内のN2，O2の濃度推移を示す
図、第５図は従来装置を示す図である。
２……取鍋、３……取鍋蓋、４……横孔ラン
ス、５……ガス吐出口、１１……溶鋼導入口に設
けられたアルミ箔。
Figures 1, 2, and 3 A, B, and C are diagrams showing embodiments of the present invention, and Figure 4 shows the concentration of N 2 and O 2 in the ladle during Ar gas exchange of the atmosphere in the ladle. FIG. 5, which is a diagram showing the transition, is a diagram showing a conventional device. 2...Ladle, 3...Ladle lid, 4...Horizontal lance, 5...Gas discharge port, 11...Aluminum foil provided at the molten steel inlet.
Claims (1)
貫通して取鍋内に挿入されたランスからアルゴン
ガスを吹込むための装置であつて、該ランスは周
方向および長さ方向に複数のガス吐出口を備え、
該取鍋蓋はアルミ箔で覆われた溶鋼導入口を備え
ていることを特徴とする取鍋内雰囲気のアルゴン
ガス置換装置。 This is a device for covering the upper part of the ladle with a ladle lid and blowing argon gas from a lance inserted into the ladle through the ladle lid, and the lance has a plurality of holes in the circumferential direction and the length direction. Equipped with a gas discharge port,
An apparatus for replacing the atmosphere inside the ladle with argon gas, characterized in that the ladle lid has a molten steel inlet covered with aluminum foil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985018202U JPH0226922Y2 (en) | 1985-02-09 | 1985-02-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985018202U JPH0226922Y2 (en) | 1985-02-09 | 1985-02-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61133541U JPS61133541U (en) | 1986-08-20 |
| JPH0226922Y2 true JPH0226922Y2 (en) | 1990-07-20 |
Family
ID=30506614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985018202U Expired JPH0226922Y2 (en) | 1985-02-09 | 1985-02-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0226922Y2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5228757A (en) * | 1975-08-30 | 1977-03-03 | Nippon Denso Co Ltd | Heat exchanger |
| JPS5415558A (en) * | 1977-07-06 | 1979-02-05 | Mitsubishi Electric Corp | Electric heating pot |
| JPS59201952A (en) * | 1983-04-28 | 1984-11-15 | Izumi Jidosha Kogyo Kk | Piston and its manufacture for internal-combustion engine |
-
1985
- 1985-02-09 JP JP1985018202U patent/JPH0226922Y2/ja not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5228757A (en) * | 1975-08-30 | 1977-03-03 | Nippon Denso Co Ltd | Heat exchanger |
| JPS5415558A (en) * | 1977-07-06 | 1979-02-05 | Mitsubishi Electric Corp | Electric heating pot |
| JPS59201952A (en) * | 1983-04-28 | 1984-11-15 | Izumi Jidosha Kogyo Kk | Piston and its manufacture for internal-combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61133541U (en) | 1986-08-20 |
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