JPH03204141A - Method for casting clean steel ingot - Google Patents
Method for casting clean steel ingotInfo
- Publication number
- JPH03204141A JPH03204141A JP34336889A JP34336889A JPH03204141A JP H03204141 A JPH03204141 A JP H03204141A JP 34336889 A JP34336889 A JP 34336889A JP 34336889 A JP34336889 A JP 34336889A JP H03204141 A JPH03204141 A JP H03204141A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- powder
- ingot
- molten
- case
- 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 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 title claims description 23
- 239000000843 powder Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 20
- 239000011449 brick Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 239000011888 foil Substances 0.000 claims abstract description 8
- 230000000630 rising effect Effects 0.000 claims abstract description 3
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 239000000155 melt Substances 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 16
- 239000011261 inert gas Substances 0.000 abstract description 5
- 239000012768 molten material Substances 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
本発明は、清浄度がきわめて高い鋼塊を鋳造する方法に
関する。The present invention relates to a method for casting steel ingots with extremely high cleanliness.
鋼のインゴット鋳造を行なうに当って、たとえば転勤疲
労強度に対する要求がきびしいベアリング材などを製造
する場合は、地キズの原因となる非金属介在物の存在を
極力排除したい。
鋼の溶解および精錬において、非金属介在物を十分に除
去する努力が重ねられているが、なお鋳塊中に存在する
ことが避けられない。 それは、インゴット鋳造に際し
て溶鋼が大気と接触し、その中の、たとえばＡＩが酸化
されてＡｌ２Ｏ３となる、新たな介在物生成現象が起る
からである。
酸化物の生成を防止するには、Ａｒのような不活性ガス
でシールした雰囲気下に鋳造を行なえばよく、この目的
で、下注ぎ鋳造における溶鋼注入管の頂部に、ガス噴出
ノズルをそなえた中空リングをのせ、耐熱クツション材
を介して取鍋底のタップ口との間をほぼ気密に保ち、Ａ
ｒガスシールを行なう方法が採用されている。 しかし
、この手法によっても、注入管や湯道内部にある空気に
溶鋼が接触して酸化物が生成することまでは防げない。
湯道を進入してくる溶鋼の先端部で酸化物ができるこ
とは、鋼塊のインゴットケース底部近くに非金属介在物
が多いという事実により裏付けられる。
完全な不活性ガス雰囲気下に鋳造を行なおうとすれば、
インゴットケースに蓋をして、その内部までＡｒガスで
置換しておけばよいが、多量のガスを消費するうえに置
換に長時間を要するから、これは現実味のある対策とは
いえはない。When casting steel ingots, for example, when manufacturing bearing materials that have strict requirements for rolling fatigue strength, it is desirable to eliminate as much as possible the presence of nonmetallic inclusions that can cause ground scratches. Although efforts have been made to sufficiently remove nonmetallic inclusions in the melting and refining of steel, their presence in the ingot is unavoidable. This is because molten steel comes into contact with the atmosphere during ingot casting, and a new phenomenon of inclusion generation occurs in which, for example, AI is oxidized to become Al2O3. In order to prevent the formation of oxides, it is sufficient to perform casting in an atmosphere sealed with an inert gas such as Ar, and for this purpose, a gas jet nozzle is provided at the top of the molten steel injection pipe in bottom pour casting. Place the hollow ring and keep it almost airtight between it and the tap opening on the bottom of the ladle through the heat-resistant cushion material.
A method of performing a gas seal is adopted. However, even with this method, it is not possible to prevent molten steel from coming into contact with the air inside the injection pipe or runner and forming oxides. The fact that oxides are formed at the tip of the molten steel entering the runner is supported by the fact that there are many nonmetallic inclusions near the bottom of the ingot case of the steel ingot. If you try to perform casting under a completely inert gas atmosphere,
It would be possible to cover the ingot case and replace the inside with Ar gas, but this is not a realistic measure as it consumes a large amount of gas and takes a long time to replace.
本発明の目的は、上記した問題を打破し、鋼のインゴッ
ト鋳造に当って過大な量のＡｒガスを消費することなく
溶鋼の進入路を不活性ガス雰囲気下に保ち、かつ溶鋼湯
面を大気から遮断しつつ鋳造を行ない、地キズの原因と
なる非金属介在物の生成を極力排除した鋳造方法を提供
することにある。The purpose of the present invention is to overcome the above-mentioned problems, maintain the entrance path of molten steel under an inert gas atmosphere without consuming an excessive amount of Ar gas during steel ingot casting, and keep the molten steel surface in the atmosphere. It is an object of the present invention to provide a casting method in which the formation of non-metallic inclusions that cause scratches on the ground is eliminated as much as possible by performing casting while being isolated from the ground.
本発明の清浄な鋼塊を鋳造する方法は、下注ぎ法により
鋼塊を鋳造するに当り、第１図に示すように、溶鋼注入
管（１）の頂部にＡｒシールリング（２）を設置し、そ
の上部を、溶鋼の流下により破れるシート状材料（５）
で密閉するとともに、インボッ・トケース（４）底部に
開口する湯道（３）のレンガ立上り口（３１）を閉鎖材
（６）で閉鎖し、その直上に早期溶融パウダー（７）を
配置しておき、Ａｒシールリング（２）を通してＡｒガ
スを導入することにより溶鋼注入管（１）内および湯道
（３）内の空気をＡｒ置換した後に溶鋼の流下を開始し
て、溶鋼がＡｒ雰囲気下に注入管（１）および湯道（３
）を進み、インゴットケス（４）内に流入してそこで直
ちに早期溶融パウダー（７）と接触し、これを溶融させ
ることにより湯面がパウダー溶融物に覆われたまま上昇
してインゴットケースに充満するようにしたことを特徴
とする。
溶鋼注入管上部を密閉するシート状材料（５）は、アル
ミ箔を使用するとよい。 一方、湯道レンガ立ち上り口
（３１）の閉鎖は、簡易にはガスの通過をわずかに許す
程度の閉鎖材で蓋をすることでも可能であるが、第２図
ＡおよびＢに一例を示すような、金属箔、紙またはプラ
スチック製の弁（６）であって、ガスの上方への通過は
実線のように許すが、下方への通過は破線のように妨げ
るものによって行なうと、効果的である。
［作 用］
溶鋼注入管（１）および湯道（３）内の空気をＡｒで置
換したのち溶鋼を流下させると、アルミ箔のようなシー
ト状材料（５）が破れて、溶鋼が注入管に入る。 溶鋼
を入れた取鍋の底と注入管の間は、「カオウール」のよ
うな耐熱緩衝材で、はぼ気密に保たれている。
Ａｒガスが充満した流路中を進入した溶鋼は、湯道レン
ガ立上り口（３１）で、前記した紙製の弁のような閉鎖
材（６）を破ってインゴットケース（４）内に入るが、
直ちに早期溶融パウダー（７）と接触してこれを溶融さ
せ、溶融物で覆われた状態で湯面が上昇して行くから、
空気に触れることがない。
本発明の好ましい態様においては、第１図に示したよう
に、早期溶融パウダー（７）の上方にもパウダー（８）
を配置しておき、湯面上に未溶融パウダー層が存在する
状態でインゴットケース内を湯面か上昇するようにして
、鋳造を実施する。
早期溶融パウダーは「フロントパウダー」とよばれる低
融点のパウダーで、溶鋼と接触したときに速やかに溶け
てその表面を被覆し、大気と湯面との接触を断つ。 と
ころが、湯面の上昇につれてインゴットケースと鋳塊と
の間に膜をつくって消費されて行く。 その間に、上記
した１本体パウダー」とよばれる溶融点の高いパウダー
を溶鋼と接触させれば、その溶融物がフロントパウダの
不足を補うとともｋ、未溶融粉末の層が形成されて保温
に役立つ。
このようにして、第３図にみるように、インゴットケー
ス（４）内では、溶ｉｎ！！（９）の周囲および上にフ
ロントパウダーの溶融物（７Ｇ） 、本体パウダーの溶
融物（８Ｇ＞、半溶融物（８ｂ）、および未溶融物（８
ａ）かのった状態で、本体パウダーの溶融が少しずつ進
行しながら湯面が上昇して行くことになり、空気との接
触を避は保温した状態で鋳造が進む。In the method of casting a clean steel ingot according to the present invention, when casting a steel ingot by the bottom pouring method, as shown in Fig. 1, an Ar seal ring (2) is installed at the top of the molten steel injection pipe (1). The upper part of the sheet-like material (5) is torn by falling molten steel.
At the same time, the brick opening (31) of the runner (3) that opens at the bottom of the inbot case (4) is closed with a closing material (6), and early melting powder (7) is placed directly above it. Then, by introducing Ar gas through the Ar seal ring (2), the air in the molten steel injection pipe (1) and the runner (3) is replaced with Ar, and then the molten steel starts flowing down, and the molten steel is placed in an Ar atmosphere. Injection pipe (1) and runner (3)
), it flows into the ingot case (4), where it immediately comes into contact with the early melting powder (7), and by melting this, the molten metal surface rises while being covered with the powder melt, filling the ingot case. It is characterized by being made to do. Aluminum foil is preferably used as the sheet material (5) for sealing the upper part of the molten steel injection pipe. On the other hand, it is possible to close the runner brick opening (31) simply by covering it with a closing material that slightly allows gas to pass through, but an example is shown in Fig. 2 A and B. It is effective to use a valve (6) made of metal foil, paper, or plastic that allows the gas to pass upwards as shown by the solid line, but prevents the gas from passing downwards as shown by the broken line. be. [Function] When the air in the molten steel injection pipe (1) and runner (3) is replaced with Ar and the molten steel is allowed to flow down, the sheet material (5) such as aluminum foil is torn and the molten steel flows into the injection pipe. to go into. The space between the bottom of the ladle containing molten steel and the injection pipe is kept airtight with a heat-resistant cushioning material such as Kao Wool. The molten steel that has entered the channel filled with Ar gas breaks through the above-mentioned paper valve-like closing material (6) at the runner brick opening (31) and enters the ingot case (4). ,
It immediately comes into contact with the early melting powder (7) and melts it, and the molten metal level rises while being covered with the molten material.
never comes into contact with air. In a preferred embodiment of the present invention, as shown in FIG.
is placed, and casting is carried out by allowing the hot water level to rise inside the ingot case while an unmelted powder layer exists on the hot metal surface. Early melting powder is a powder with a low melting point called ``front powder.'' When it comes into contact with molten steel, it quickly melts and coats the surface, cutting off contact between the atmosphere and the molten metal surface. However, as the hot water level rises, a film forms between the ingot case and the ingot and the metal is consumed. During this time, if the above-mentioned powder with a high melting point called "1 body powder" is brought into contact with the molten steel, the molten material will compensate for the lack of front powder, and a layer of unmelted powder will be formed to retain heat. Helpful. In this way, as shown in Figure 3, the ingot case (4) is melted in! ! Around and on top of (9) are melted front powder (7G), melted body powder (8G>, semi-melted material (8b), and unmelted material (8
a) In this state, the melt level will rise as the main body powder melts little by little, and casting will proceed in a state where it is kept warm while avoiding contact with air.
第１図に示した構造の鋳造装置を組み立てた。
溶鋼注入管上部はアルミ箔で密閉し、湯道レンガ立上り
口は、和紙で製作した第２図に示す構成の弁で閉鎖して
、ＡｒシールリングからＡｒガスを５００１）／分の速
度で５分間注入した。 閉鎖材の弁が動いて、空気がＡ
ｒ置換されて行くのが観寮された。
インゴットケースは４．６トン用を用い、Ａｌ５Ｉ４３
２０鋼を、取鍋１チヤージから１８本の鋼塊に鋳造した
。
パウダーは、第１図に示す位置に、下記の組成および物
性のフロントパウダーおよび本体パウダーを、それぞれ
１．５ｆｆｆｆおよび５Ｋｙ使用した。
本体パウダ
４０重量％
６
８
フロントパウダー
５１０２ ３３重量％
Ａ、ｆｌ ２ ｏ３１１
Ｆｅ２０３ ４
ＣａＯ３５
Ｎａ２０ ５
仝Ｃ５，５
６
軟化点 １１４０’Ｃ１１９０℃
得られた鋳塊を直径１６０ｍに圧延し、表層部深さ５ｍ
〜５０ｍの範囲を５ｍごとにしらべ、地キズの数をかぞ
えた。
その結果を、従来の、単に取鍋からの溶鋼流だけＡ「シ
ールして鋳造した場合と比較して示せば、つぎのとあり
である。
比較例 １〜５ １〜５ １６〜３０本発明
ＯＯＯ
インゴットケース内の空気もＡｒガス置換する場合を想
定すると、置換すべき空間の容積が注入管および湯道だ
けの容積の１０倍に達するから、Ａｒガス量も１０倍必
要であり、置換操作の時間も長くかかり、側底実用的で
ない。
［発明の効果］
本発明の鋳造方法によれば、必要最少限のＡｒガス消費
をもって鋳造装置を不活性ガス置換することが可能であ
り、地キズが実質上ない清浄な鋳塊を得ることができる
。A casting apparatus having the structure shown in FIG. 1 was assembled. The upper part of the molten steel injection pipe was sealed with aluminum foil, the runner brick opening was closed with a valve made of Japanese paper and shown in Figure 2, and Ar gas was injected from the Ar seal ring at a rate of 5001)/min. injected for minutes. The valve of the closing material moves and the air is
I was watching the dormitory being replaced by r. The ingot case is for 4.6 tons, and Al5I43 is used.
20 steel was cast into 18 ingots from one ladle charge. A front powder and a main body powder having the following composition and physical properties were used at the positions shown in FIG. 1 in amounts of 1.5 ffff and 5 Ky, respectively. Main body powder 40% by weight 6 8 Front powder 5102 33% by weight A, fl 2 o311 Fe203 4 CaO35 Na20 5 仝C5,5 6 Softening point 1140'C1190°C The obtained ingot was rolled to a diameter of 160 m, and the surface layer depth was 5m
The area of ~50m was examined every 5m and the number of ground scratches was counted. The results are as follows when compared with the conventional case where only the molten steel flow from the ladle was sealed and cast. Comparative Examples 1-5 1-5 16-30 Present Invention
OOO Assuming that the air inside the ingot case is also replaced with Ar gas, the volume of the space to be replaced is 10 times the volume of the injection pipe and runner alone, so 10 times the amount of Ar gas is required, and the replacement operation is It takes a long time and is not practical. [Effects of the Invention] According to the casting method of the present invention, it is possible to replace the casting equipment with inert gas while consuming the necessary minimum amount of Ar gas, and it is possible to obtain a clean ingot with substantially no ground scratches. can.
第１図は、本発明の鋳造方法を説明するための、溶鋼注
入管および１個のインゴットケースとその湯道を示した
、鋳造装置の断面図である。
第２図ＡおよびＢは、第１図の鋳造装置において湯道レ
ンガ立ち上り口の閉鎖材として使用する弁の構造を示す
ものであって、Ａは平面図であり、Ｂは断面図である。
第３図は、本発明の鋳造方法の好ましい態様において、
インゴットケース内を上昇する湯面の、パウダーによる
被覆の状況を示す断面図である。
１・・・ 溶鋼注入管
２・・・Ａｒシールリング
３・・・湯道
３つ・・・湯道レンガ立上り口
４・・・インゴットケース
５・・・シート状材料
６・・・弁（閉鎖材）
７・・・早期溶融（フロント）パウダー８・・・（本体
）パウダ
８ａ・・・未溶融物 ８ｂ・・・半溶融物８Ｃ・・
・溶融物
９・・・溶 鋼FIG. 1 is a sectional view of a casting apparatus showing a molten steel injection pipe, one ingot case, and its runner, for explaining the casting method of the present invention. 2A and 2B show the structure of a valve used as a closing member for the runner brick opening in the casting apparatus of FIG. 1, with A being a plan view and B being a sectional view. FIG. 3 shows, in a preferred embodiment of the casting method of the present invention,
FIG. 3 is a cross-sectional view showing how the hot water level rising inside the ingot case is coated with powder. 1... Molten steel injection pipe 2... Ar seal ring 3... 3 runners... Runway brick opening 4... Ingot case 5... Sheet material 6... Valve (closed) Material) 7... Early melting (front) powder 8... (Main body) powder 8a... Unmelted material 8b... Semi-melted material 8C...
・Melted material 9... Molten steel
Claims (1)
管の頂部にＡｒシールリングを設置し、その上部を、溶
鋼の流下により破れるシート状材料で密閉するとともに
、インゴットケース底部に開口する湯道レンガ立上り口
を閉鎖材で閉鎖し、その直上に早期溶融パウダーを配置
しておき、Ａｒシールリングを通してＡｒガスを導入す
ることにより溶鋼注入管内および湯道内の空気をＡｒ置
換した後に溶鋼の流下を開始して、溶鋼がＡｒ雰囲気下
に注入管および湯道を進み、インゴットケース内に流入
してそこで直ちに早期溶融パウダーと接触し、これを溶
融させることにより湯面がパウダー溶融物に覆われたま
ま上昇してインゴットケースに充満するようにしたこと
を特徴とする、清浄な鋼塊を鋳造する方法。（２）溶鋼
注入管上部の密閉をアルミ箔を使用して行ない、湯道レ
ンガ立ち上り口の閉鎖を、金属箔、紙またはプラスチッ
ク製の弁であって、ガスの上方への通過は許すが下方へ
の通過は妨げる閉鎖材によって行なう請求項１の製造方
法。 （３）早期溶融パウダーの上方にもパウダーを配置して
おき、湯面上に未溶融パウダー層が存在する状態でイン
ゴットケース内を湯面が上昇するようにして実施する請
求項１の製造方法。[Claims] (1) When casting a steel ingot by the bottom pouring method, an Ar seal ring is installed at the top of the molten steel injection pipe, and the upper part is sealed with a sheet material that can be torn by the flow of molten steel. , the runner brick riser opening at the bottom of the ingot case is closed with a closing material, the early molten powder is placed directly above it, and the air in the molten steel injection pipe and runner is introduced by introducing Ar gas through the Ar seal ring. After the molten steel is replaced with Ar, the molten steel starts flowing down, advances through the injection pipe and runner in an Ar atmosphere, flows into the ingot case, where it immediately comes into contact with the early molten powder, and melts it. A method of casting a clean steel ingot, characterized in that the ingot case is filled with the ingot by rising while the surface is covered with powder melt. (2) Seal the top of the molten steel injection pipe using aluminum foil, and close the runner brick opening with a valve made of metal foil, paper, or plastic that allows gas to pass upward but downward. 2. A method as claimed in claim 1, wherein passage through is effected by an obstructing closure. (3) The manufacturing method according to claim 1, wherein the powder is placed above the early melting powder, and the melt level is raised in the ingot case in a state where an unmelted powder layer exists on the melt surface. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34336889A JPH03204141A (en) | 1989-12-29 | 1989-12-29 | Method for casting clean steel ingot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34336889A JPH03204141A (en) | 1989-12-29 | 1989-12-29 | Method for casting clean steel ingot |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03204141A true JPH03204141A (en) | 1991-09-05 |
Family
ID=18360976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34336889A Pending JPH03204141A (en) | 1989-12-29 | 1989-12-29 | Method for casting clean steel ingot |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03204141A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011011227A (en) * | 2009-07-01 | 2011-01-20 | Sumitomo Metal Ind Ltd | Bottom-pouring type ingot-casting method for steel |
| CN103252461A (en) * | 2013-05-13 | 2013-08-21 | 山西太钢不锈钢股份有限公司 | Method for pouring electrode billet |
-
1989
- 1989-12-29 JP JP34336889A patent/JPH03204141A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011011227A (en) * | 2009-07-01 | 2011-01-20 | Sumitomo Metal Ind Ltd | Bottom-pouring type ingot-casting method for steel |
| CN103252461A (en) * | 2013-05-13 | 2013-08-21 | 山西太钢不锈钢股份有限公司 | Method for pouring electrode billet |
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