JPS63238208A - Method for pretreating molten iron at casting floor - Google Patents
Method for pretreating molten iron at casting floorInfo
- Publication number
- JPS63238208A JPS63238208A JP7155587A JP7155587A JPS63238208A JP S63238208 A JPS63238208 A JP S63238208A JP 7155587 A JP7155587 A JP 7155587A JP 7155587 A JP7155587 A JP 7155587A JP S63238208 A JPS63238208 A JP S63238208A
- Authority
- JP
- Japan
- Prior art keywords
- slag
- hot metal
- stage
- treatment
- agent
- 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
- 238000005266 casting Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title claims description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title abstract 16
- 229910052742 iron Inorganic materials 0.000 title abstract 8
- 239000002893 slag Substances 0.000 claims abstract description 62
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 238000007664 blowing Methods 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims description 57
- 229910052751 metal Inorganic materials 0.000 claims description 57
- 239000000843 powder Substances 0.000 claims description 15
- 238000002203 pretreatment Methods 0.000 claims description 7
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 239000012159 carrier gas Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 230000003009 desulfurizing effect Effects 0.000 abstract 3
- 239000000463 material Substances 0.000 abstract 1
- 238000005987 sulfurization reaction Methods 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 description 11
- 239000011593 sulfur Substances 0.000 description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 7
- 229910052698 phosphorus Inorganic materials 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、転炉精錬用の溶銑を、脱Ｓｉ、脱Ｐ、脱Ｓ’
Ｊの予備処理を行なう方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to the use of hot metal for converter refining to remove Si, P, and S'.
The present invention relates to a method for performing preliminary processing of J.
従来の技術
従来、鋳床樋にて溶銑上に設置された、又は溶銑中に浸
漬して設置されたランスノズルからキャリアガスによっ
て粉体をインジェクションし、溶銑予備処理を行なう方
法については、特開昭５７−２００５１０号公報、特開
昭５８−１３０２０８号公報等多数の開示例がある。Conventional technology A method for pre-treating hot metal by injecting powder using a carrier gas from a lance nozzle placed above hot metal in a cast bed trough or immersed in hot metal is disclosed in Japanese Patent Application Laid-Open No. There are many disclosed examples, such as Publication No. 57-200510 and Japanese Unexamined Patent Publication No. 130208-1984.
極低硫鋼を作る場合、通常のバッチ処理の工程では、脱
Ｓｉ処理後、脱Ｓｉスラグを排滓した後、脱Ｐ、同時脱
Ｓ処理を行ない、一般的には別に脱Ｓ処理工程は不要で
あるが、上記鋳床樋での粉体インジェクションによる脱
Ｓｉ、脱Ｓ処理工程では。When making ultra-low sulfur steel, in the normal batch processing process, after the Si removal process, the Si removal slag is removed, and then the P removal and S removal processes are performed simultaneously.In general, a separate S removal process is performed. Although it is not necessary, in the above-mentioned step of removing Si and removing S by powder injection in the casting bed gutter.
脱Ｐ処理時の同時脱Ｓ率が低く、極低硫鋼を製造するた
めには、別途脱Ｓ処理工程が必要である。In order to produce ultra-low sulfur steel with a low simultaneous S removal rate during the P removal process, a separate S removal process is required.
しかしながら脱Ｓｉ処理、脱Ｓ処理工程に脱Ｓ処理を行
なおうとした場合、脱Ｓｉスラグが容易には自然排滓で
きず、機械的排滓設備が必要となり、設備費が高くなる
とともに鋳床上で設備が非常に大がかりな煩雑な状態と
なるため、これまで低燐極低硫溶銑（溶銑［Ｐ］≦Ｏ’
、０１０％、 ［Ｓコ≦０．００５％）は鋳床での溶銑
予備処理プロセスでは容易には製造できていなかった。However, when attempting to perform S removal during the Si and S removal processes, the Si-free slag cannot be easily removed naturally and requires mechanical removal equipment, which increases equipment costs and Since this requires extremely large-scale and complicated equipment, it has been difficult to use low-phosphorus, extremely low-sulfur hot metal (hot metal [P]≦O'
, 010%, [S co≦0.005%) could not be easily produced in the hot metal pretreatment process in the cast bed.
発明が解決しようとする問題点
鋳床溶銑樋での粉体吹込みによる連続脱Ｐ処理の場合、
トビードカーでのバッチ処理に比べ、同時に起こる脱Ｓ
率が低い理由として、バッチ処理の場合に比ベスラグ中
の％（ＦｅｔＯ）が高いためであり、これはバッチ処理
の場合、スラグメタル間の反応時間が長く、ＣによるＦ
ｅｔＯの還元が進むのに対し、鋳床溶銑樋での連続処理
の場合、スラ ゛グメタル反応時間が短いため
、排滓される直前でもスラグ中の％（Ｆｅｄ）は高くな
っていると考えられる。Problems to be solved by the invention In the case of continuous deP treatment by powder injection in the cast bed hot metal trough,
Compared to batch processing using a tobee car, the S removal that occurs at the same time
The reason for the low ratio is that the percentage (FetO) in the slag is high in the case of batch processing, which is due to the long reaction time between slag metals and the reduction in F by C.
While etO reduction progresses, the slag metal reaction time is short in the case of continuous treatment in the casthouse hot metal trough, so it is thought that the % (Fed) in the slag remains high even just before it is slaged. .
また脱Ｓ剤そのものはＣａＯ系であり、脱Ｓ後の生成ス
ラグは粘性がかなり高くなる。鋳床脱Ｓ時の脱Ｓスラグ
の粘性を下げるためＣａＦ２の添加が考えちれるが、溶
銑樋耐大物、ランス耐大物の溶損が大きくなるため、多
量添加は無理であり、従うて脱Ｓ後のスラグの粘性を、
自然排滓が可能なレベルまで下げることは難しく機械的
排滓設備が必要となる。Furthermore, the S removal agent itself is CaO-based, and the slag produced after S removal has a considerably high viscosity. Adding CaF2 can be considered to reduce the viscosity of the desulfurized slag during casthouse desulfurization, but it is impossible to add a large amount because the melting loss of hot metal gutter and lance-resistant objects will increase. The viscosity of the slag after
It is difficult to lower the level to a level where natural slag removal is possible, and mechanical slag removal equipment is required.
問題点を解決するための手段
本発明は低燐、極低硫溶銑を鋳床で容易に製造できる方
法を提供せんとするものであり、本発明の要旨とすると
ころは、
（１）高炉鋳床の溶銑樋において溶銑上に設置された、
又は溶銑中に浸漬して設置された１個又は複数個のラン
スノズルを通じて粉体をキャリアガスにて溶銑中に吹込
んで溶銑予備処理する方法において、脱Ｓｉ剤を吹込ん
で主として脱Ｓｉする第一工程と、脱Ｓ剤を吹込んで脱
Ｓする第二工程と、脱Ｐ剤を吹込んで主として脱Ｐする
第三工程からなり、しかも第一工程の脱Ｓｉ処理後スラ
グは排滓し、第二工程の脱Ｓ処理後スラグは第三工程に
溶銑とともに流し、第三工程の脱Ｐ処理後スラグと混合
して排滓することを特徴とする鋳床溶銑予備処理法、及
び
（２）第一工程の脱Ｓｉ処理後スラグを第二工程および
第三工程まで溶銑とともに流し、第三工程の処理後スラ
グと混合して排滓することを特徴とする前記（１）の溶
銑予備処理法、及び
（３）１個のランスノズルから吹込む処理剤の上限量を
２５ｋｇ／ｔと定め、それを越える吹込量に対しては、
複数個のランスを用いて各々のランス間隔を１．０ｍ以
上離して吹込むことを特徴とする前記（１）、 （２）
の溶銑予備処理法である。Means for Solving the Problems The present invention aims to provide a method for easily producing low phosphorus and extremely low sulfur hot metal in a cast bed. Installed above the hot metal in the hot metal trough on the floor,
Alternatively, in a method of pre-treating hot metal by blowing powder into hot metal with a carrier gas through one or more lance nozzles installed immersed in hot metal, the first step is mainly to remove Si by injecting a desilicon agent. The second step is to inject a de-S agent to remove S, and the third step is to mainly remove P by injecting a de-P agent. Moreover, after the first step, the slag is discharged, and the second step is A casting bed hot metal pretreatment method characterized in that the slag after the S removal process in the process is flowed together with the hot metal into the third process, and is mixed with the slag after the P removal process in the third process and discharged, and (2) the first method. The hot metal pretreatment method according to (1) above, characterized in that the slag after the Si-removal treatment in the step is flowed together with the hot metal to the second and third steps, mixed with the slag after the treatment in the third step, and discharged. (3) The upper limit of the processing agent to be blown from one lance nozzle is set at 25 kg/t, and for the blown amount exceeding that,
(1) and (2) above, characterized in that the air is blown using a plurality of lances with each lance spaced at least 1.0 m apart.
This is a hot metal pretreatment method.
作用 以下本発明の詳細な説明する。action The present invention will be explained in detail below.
本発明者らは鋳床樋での粉体吹込による脱Ｓｉ処理、脱
Ｐ処理、脱Ｓ処理の試験を鋭意推進した結果、脱Ｓｉ処
理後のスラグは、通常の操業の範囲である塩基度１．２
以下でほぼ流動性は良好であり、自然排滓は可能である
が、１０％のＣａＦ２を含む脱Ｐ処理後スラグは、通常
の操業範囲である塩基度２．５〜５．０のうち塩基度３
．５以上では流動性が悪くなり、自然排滓は難しく、又
脱Ｓ処理後スラグは通常では自然排滓が難しいことがわ
かった。したがって脱Ｐ処理後スラグ及び脱Ｓ処理後ス
ラグには、機械的排滓の装置の備えが必要である。The inventors of the present invention have diligently carried out tests on Si-removal treatment, P-removal treatment, and S-removal treatment by blowing powder into the cast bed gutter. As a result, the slag after the Si-removal treatment has a basicity that is within the range of normal operation. 1.2
Although the fluidity is almost good and natural drainage is possible in the following range, the slag after deP treatment containing 10% CaF2 has a basicity of 2.5 to 5.0, which is the normal operating range. Degree 3
．． It has been found that if it is 5 or more, the fluidity becomes poor and natural slag is difficult to sludge, and it is usually difficult to slag naturally after the S-removal treatment. Therefore, the slag after the P removal process and the slag after the S removal process must be equipped with a mechanical slag removal device.
本発明者らは、脱Ｓｉ処理、次に脱Ｓ処理、さらに脱Ｐ
処理の順の工程で処理を行ない、脱Ｓ処理後スラグを排
滓しないで溶銑とともに流し、脱Ｐ処理を行なっても、
脱Ｐ効率には影響しないとともに、脱Ｓ効率にも変化が
なく、脱Ｓスラグからの復Ｓがないことを見出した。The present inventors conducted a Si-removal process, then an S-removal process, and then a P-removal process.
Even if the treatment is carried out in the order of treatment, the slag is not discharged after the S removal treatment, and is flowed together with the hot metal, and the P removal treatment is performed,
It was found that there was no effect on the P removal efficiency, there was no change in the S removal efficiency, and there was no return S from the S removal slag.
また、脱Ｓｉ処理後スラグを自然排滓しないで脱Ｓ工程
に溶銑とともに流し、ざらに脱Ｓ工程の脱Ｓ処理後スラ
グと脱Ｓｉ処理スラグの混合スラグを溶銑とともに脱Ｐ
工程へ流す試験を行なった結果、脱Ｓ工程での脱Ｓ効率
、脱Ｐ工程での脱Ｐ効率、脱Ｓ効率は脱Ｓｉ工程、脱Ｓ
工程での排滓を行なった場合と変わりないことがわかっ
た。In addition, the slag after the Si-removal process is flowed together with the hot metal into the desulfurization process without being naturally slaged, and the mixed slag of the slag after the desulfurization process and the desilicon-treated slag in the desulfurization process is dephosphorized together with the hot metal.
As a result of the tests conducted in the process, it was found that the S removal efficiency in the S removal process, the P removal efficiency in the P removal process, and the S removal efficiency in the Si removal process,
It was found that there was no difference from the case where slag was removed during the process.
そこで脱Ｓ処理後スラグと脱Ｐ処理後スラグを混合して
、強制排滓することにより、排滓設備は半分に簡略化で
き、又、さらに脱Ｓｉ処理後スラグ、脱Ｓ処理後スラグ
、脱Ｐ処理後スラグを混合した場合、低塩基度となるた
め、はとんどのスラグが自然排滓可能となり、脱Ｐ処理
場で非常に簡易な排滓設備を設置するだけでよく、大巾
に設備費が低減でき、且つ低燐、極低硫鋼の製造が可能
となった。Therefore, by mixing the slag after the S removal process and the slag after the P removal process and forcibly removing the slag, the slag removal equipment can be simplified in half. When slag is mixed after P treatment, it has a low basicity, so most of the slag can be slaged naturally, and it is only necessary to install very simple slag drainage equipment at the P removal treatment plant, which can be used in a large area. Equipment costs can be reduced and low phosphorus and ultra low sulfur steel can be produced.
脱Ｓｉ処理後スラグ、脱Ｓ処理後スラグ、脱Ｐ処理後ス
ラグを各々混合しても各工程の反応に影響がない理由と
して、鋳床溶銑樋での粉体吹込による処理の場合、反応
はほとんどが粉体の浮上する過程でおこり、浮上後はほ
とんど撹拌されず、スラグの均一化もスラグメタル反応
もあまり起らず、反応に寄与しないためと考えられる。The reason why the reaction in each process is not affected even if the slag after Si-removal treatment, the slag after S-removal treatment, and the slag after P-removal treatment are mixed is that in the case of treatment by powder injection in the cast bed hot metal trough, the reaction is This is thought to be because most of this occurs during the floating process of the powder, and there is hardly any stirring after floating, and neither slag homogenization nor slag-metal reactions occur much, and they do not contribute to the reaction.
なお本発明者らは、特願昭６ｌ−２１２１１ｔ０２号に
て開示したように、溶銑樋における粉体吹付又は粉体の
吹込による溶銑予備処理に関して、１個のランスノズル
当りの吹込粉体量を２５ｋｇ／を未満とし、それ以上の
吹込量に対しては、複数個のランスノズルを用いて各々
のランスノズル間隔を１．０ｍ以上離して吹込むことが
、反応効率を高めるため非常に重要であるため、本発明
の脱Ｓｉ、脱Ｓ、脱Ｐ各処理ともこの方法を採用するこ
とが望ましい。As disclosed in Japanese Patent Application No. 6l-21211t02, the present inventors have determined that the amount of blown powder per lance nozzle regarding the pretreatment of hot metal by powder blowing or powder blowing in hot metal sluices. When the injection amount is less than 25 kg/, it is very important to use multiple lance nozzles and keep each lance nozzle spaced at least 1.0 m apart in order to increase the reaction efficiency. Therefore, it is desirable to adopt this method for each of the Si, S, and P removal processes of the present invention.
実施例 以下本発明を実施例に基づき説明する。Example The present invention will be explained below based on examples.
第１表に示す比較例１は、鋳床樋での溶銑面上からの粉
体吹付による脱Ｓｉ、脱Ｐ（脱Ｓ）処理の結果であり、
脱Ｐ処理後の［Ｐ］は０．０１０％であるが、［Ｓ］が
０．０１０％で極低硫溶銑とはなっていない。Comparative Example 1 shown in Table 1 is the result of deSi and deP (deS) treatment by powder spraying from the surface of hot metal in the cast bed gutter,
[P] after the P removal treatment is 0.010%, but [S] is 0.010%, which is not an extremely low sulfur hot metal.
第２表の実施例１は、脱Ｓｉ工程、脱Ｓ工程、脱Ｐ工程
の順に、各工程とも鋳床樋において溶銑内に浸漬したラ
ンスノズルから粉体吹込し、脱Ｓｔスラグは処理後排滓
し、脱Ｓ処理後スラグは、後工程の脱Ｐ工程まで溶銑と
ともに流し、脱Ｐ工程で混合スラグを機械的に排滓した
場合であるが、脱Ｐ（脱Ｓ）処理後の［Ｐ］は０．００
７％、［Ｓ］は０．００３％となっている。In Example 1 in Table 2, the powder is blown into the cast bed gutter through a lance nozzle immersed in hot metal in the order of the Si-removal step, S-removal step, and P-removal step, and the St-removal slag is discharged after the treatment. The slag after slag and de-S treatment is flowed together with hot metal until the post-deP step, and the mixed slag is mechanically removed in the de-P step. ] is 0.00
7%, and [S] is 0.003%.
第３表の実施例２は脱Ｓｉ工程、脱Ｓ工程、脱Ｐ工程の
順に、各工程とも鋳床樋において溶銑面上から粉体吹付
し、脱Ｓｉ処理後スラグ、脱Ｓ処理後スラグを、ともに
脱Ｐ工程まで溶銑とともに流し、脱Ｐ工程で混合スラグ
は自然にスラグ樋に流れ出た場合であるが、脱Ｐ（脱Ｓ
）後の［Ｐ］はｏ、ｏｔｏ％、 ［Ｓ］はＯ，００２％
であった。In Example 2 in Table 3, the powder is sprayed from the surface of the hot metal in the cast bed gutter in the order of Si removal process, S removal process, and P removal process, and the slag after the Si removal treatment and the slag after the S removal treatment are removed. In both cases, the slag flows together with hot metal until the deP process, and the mixed slag naturally flows into the slag gutter during the deP process, but in the case of deP (deS)
) after [P] is o,oto%, [S] is O,002%
Met.
以上本発明例の実施例１〜２ではいずれも、低燐極低硫
溶銑（溶銑［Ｐ］≦０．０１％、［３１≦０．００５％
）が製造できた。As mentioned above, in Examples 1 and 2 of the present invention, low phosphorus and very low sulfur hot metal (hot metal [P]≦0.01%, [31≦0.005%
) could be manufactured.
（以下余白）
発明の効果
本発明によれば、高炉鋳床で低燐、極低硫溶銑を容易に
製造できる。(The following is a blank space) Effects of the Invention According to the present invention, low phosphorus and extremely low sulfur hot metal can be easily produced in a blast furnace casthouse.
Claims (4)
又は溶銑中に浸漬して設置された１個又は複数個のラン
スノズルを通じて粉体をキャリアガスにて溶銑中に吹込
んで溶銑予備処理する方法において、脱Ｓｉ剤を吹込ん
で脱Ｓｉする第一工程と、脱Ｓ剤を吹込んで脱Ｓする第
二工程と、脱Ｐ剤を吹込んで脱Ｐする第三工程からなり
、しかも第一工程の脱Ｓｉ処理後スラグは排滓し、第二
工程の脱Ｓ処理後スラグは第三工程に溶銑とともに流し
、第三工程の脱Ｐ処理後スラグと混合して排滓すること
を特徴とする鋳床溶銑予備処理法。(1) Installed above the hot metal in the hot metal gutter of the blast furnace casthouse,
Or, in a method of pre-treating hot metal by blowing powder into hot metal with a carrier gas through one or more lance nozzles installed immersed in hot metal, the first step is to blow a desilicon agent to remove Si. It consists of a second step of injecting a desulfurization agent to remove S, and a third step of injecting a desulfurization agent to remove P. Furthermore, the slag is removed after the first step of desiliconization treatment, and the slag is removed in the second step. A casting bed hot metal pretreatment method characterized in that the slag after the S removal treatment is flowed together with the hot metal into a third step, and is mixed with the slag after the P removal treatment in the third step and discharged.
２５ｋｇ／ｔと定め、それを越える吹込量の場合は、複
数個のランスノズルを用いて各々のランス間隔を１．０
ｍ以上離して吹込むことを特徴とする特許請求の範囲第
１項記載の溶銑予備処理法。(2) The upper limit of the treatment agent to be blown from one lance nozzle is set at 25 kg/t, and if the blown amount exceeds that, multiple lance nozzles are used and each lance interval is set at 1.0 kg/t.
The hot metal pretreatment method according to claim 1, characterized in that the hot metal is blown at a distance of m or more.
又は溶銑中に浸漬して設置された１個又は複数個のラン
スノズルを通じて粉体をキャリアガスにて溶銑中に吹込
んで溶銑予備処理する方法において、脱Ｓｉ剤を吹込ん
で脱Ｓｉする第一工程と、脱Ｓ剤を吹込んで脱Ｓする第
二工程と、脱Ｐ剤を吹込んで脱Ｐする第三工程からなり
、しかも第一工程の脱Ｓｉ処理後スラグ及び第二工程の
脱Ｓ処理後スラグは第三工程に溶銑とともに流し、第三
工程の脱Ｐ処理後スラグと混合して排滓することを特徴
とする鋳床溶銑予備処理法。(3) Installed above the hot metal in the hot metal gutter of the blast furnace casthouse,
Or, in a method of pre-treating hot metal by blowing powder into hot metal with a carrier gas through one or more lance nozzles installed immersed in hot metal, the first step is to blow a desilicon agent to remove Si. It consists of a second step of injecting a de-S agent to remove S, and a third step of de-P by injecting a de-P agent, and the slag after the de-Si treatment in the first step and after the de-S treatment in the second step. A casting bed hot metal pretreatment method characterized by flowing the slag together with the hot metal in the third step, and mixing it with the slag after the third step deP treatment and discharging the slag.
２５ｋｇ／ｔと定め、それを越える吹込量の場合は、複
数個のランスノズルを用いて各々のランス間隔を１．０
ｍ以上離して吹込むことを特徴とする特許請求の範囲第
３項記載の溶銑予備処理法。(4) The upper limit of the treatment agent to be injected from one lance nozzle is set at 25 kg/t, and if the injected amount exceeds that amount, multiple lance nozzles are used and each lance interval is set to 1.0 kg/t.
The hot metal pretreatment method according to claim 3, characterized in that the hot metal is blown at a distance of m or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7155587A JPS63238208A (en) | 1987-03-27 | 1987-03-27 | Method for pretreating molten iron at casting floor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7155587A JPS63238208A (en) | 1987-03-27 | 1987-03-27 | Method for pretreating molten iron at casting floor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63238208A true JPS63238208A (en) | 1988-10-04 |
Family
ID=13464092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7155587A Pending JPS63238208A (en) | 1987-03-27 | 1987-03-27 | Method for pretreating molten iron at casting floor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63238208A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6056201A (en) * | 1983-09-07 | 1985-04-01 | Rohm Co Ltd | Variable block gauge |
-
1987
- 1987-03-27 JP JP7155587A patent/JPS63238208A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6056201A (en) * | 1983-09-07 | 1985-04-01 | Rohm Co Ltd | Variable block gauge |
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