JPS61257414A - Adding method for lead-containing material - Google Patents
Adding method for lead-containing materialInfo
- Publication number
- JPS61257414A JPS61257414A JP60095898A JP9589885A JPS61257414A JP S61257414 A JPS61257414 A JP S61257414A JP 60095898 A JP60095898 A JP 60095898A JP 9589885 A JP9589885 A JP 9589885A JP S61257414 A JPS61257414 A JP S61257414A
- Authority
- JP
- Japan
- Prior art keywords
- lead
- quicklime
- molten steel
- powder
- mixture
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、溶鋼に鉛含有物質を添加する方法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for adding lead-containing substances to molten steel.
従来の技術
鋼中の微細鉛含有物質は、鉛単独あるいは硫化物と結合
して存在するがこれらは鋼の被削性を大巾に改善するこ
とが知られている。又従来の鉛含有物質の添加方法とし
ては大略以下の３つの方法がある。BACKGROUND OF THE INVENTION Fine lead-containing substances in prior art steel, present either alone or in combination with sulfides, are known to greatly improve the machinability of steel. Furthermore, as conventional methods for adding lead-containing substances, there are roughly the following three methods.
（１）溶鋼を鋼塊鋳型に注入中に添加する。(1) Adding molten steel to a steel ingot mold during pouring.
（２）取鍋の底よりＡｒ又はＮ２カスのような不活性ガ
スを吹き込み攪拌しながら鉛含有物質を」三方より添加
する。(2) Inert gas such as Ar or N2 scum is blown into the bottom of the ladle and the lead-containing substance is added from three sides while stirring.
（３）インジェクションランスを用いて不活性ガスと共
に鉛含有物質を添加する。(3) Add a lead-containing substance together with an inert gas using an injection lance.
しかし最近は連鋳化が促進され、鉛快削鋼も既に連鋳化
が図られていることや、（２）の自然落下による取鍋上
部からの添加方式では、鉛の比重が鉄よりも大きい為に
、溶鋼中で不均一に分散し、その結果、均一な被削性を
有する鋼材を得ることが困難であることから（３）の方
法がより一般的である。However, recently, continuous casting has been promoted, and lead free-cutting steel has already been continuously cast. Because of their large size, they are dispersed non-uniformly in molten steel, and as a result, it is difficult to obtain a steel material with uniform machinability, so method (3) is more common.
そして、インジェクションランスを用いて鉛含有物質を
添加する場合、金属鉛単体では比重が約１１．２と重い
ことから、見掛け」−の比重を軽くするために生石灰と
混合し、インジェクションする方法が知られている。（
鉄と鋼Ｎ０１４、Ｖｏｕ、８８、ＭＡＲ，１９８２、“
８２−３２５３）。又同様の目的で、金属鉛と酸化鉛を
混合して添加することが特願昭５８−１５５４９０号に
提案されている。When adding lead-containing substances using an injection lance, metal lead alone has a heavy specific gravity of about 11.2, so it is known to mix it with quicklime and inject it in order to reduce the apparent specific gravity. It is being (
Tetsu to Hagane N014, Vou, 88, MAR, 1982, “
82-3253). Furthermore, for the same purpose, it has been proposed in Japanese Patent Application No. 155490/1983 to add a mixture of metallic lead and lead oxide.
発明が解決しようとする問題点
しかし、生石灰は、通常脱（Ｓ）フラックスである為に
、機械構造用ＡＱ−３ｉギルド鋼に鉛を添加する場合、
あるいは低度（Ｓ）快削鋼に鉛を添加する場合でも、脱
（Ｓ）反応が進行し、特に低度Ｃ３）快削鋼では、〔Ｓ
〕規格がある為に（Ｓ）の成分不適中が発生し易く、品
質」二問題となる。Problems to be Solved by the Invention However, since quicklime is usually de-(S)-fluxed, when lead is added to AQ-3i guild steel for machine structures,
Alternatively, even when lead is added to low-grade (S) free-cutting steel, the de-(S) reaction proceeds, especially in low-grade (C3) free-cutting steel.
] Because of the standards, it is easy for the component (S) to be found to be inappropriate, resulting in two quality problems.
また生石灰は吸湿性に富む為に、生石灰を多量に溶鋼中
に添加した場合、生石灰中の水分が解離し、鋼中のＣＨ
）濃度が上Ａする。特に機械構造用鋼材は鋼中（Ｈ）を
鎌うため生石灰の特別な管理が必要となる。従って生石
灰の使用量は、できるだけ少なくすることが望ましい。In addition, since quicklime is highly hygroscopic, when a large amount of quicklime is added to molten steel, the water in the quicklime dissociates and the CH in the steel
) The concentration is higher than A. Particularly in the case of steel materials for machine structures, special management of quicklime is required because (H) is present in the steel. Therefore, it is desirable to use as little quicklime as possible.
ここで、生石灰原単位と脱（Ｓ）率の関係を第２図に示
す。鋼種はＳＵＭ系（低度Ｃ３）快削鋼）であり、鋼中
Ｃ３）濃度は０．３２０〜０．３３０％の高Ｃ３）であ
る。生イー■灰添加量が増加するはと脱（Ｓ）率は増加
し、約１０ｋｇ／ｌ−ｓの生右灰呈で２５％の脱（Ｓ）
率である。従って、実際の製造プロセスでは、鉛を添加
後高純度硫化鋼またはＦｅ −Ｓを添加し、所定の〔Ｓ
′３濃度に成分調整を行なう。または生石灰添加中の脱
［：Ｓ：１ｌｌＪを考虜゛シ、転炉出鋼中に予め（Ｓ）
濃度を高くしておく方法がとられる。Here, the relationship between quicklime consumption rate and removal (S) rate is shown in Figure 2. The steel type is SUM type (low C3) free-cutting steel), and the C3) concentration in the steel is high C3) of 0.320 to 0.330%. As the amount of ash added increases, the removal (S) rate increases, and 25% removal (S) is achieved at approximately 10 kg/l-s of fresh ash.
rate. Therefore, in the actual manufacturing process, high purity sulfide steel or Fe-S is added after lead is added, and a predetermined [S
'3 Adjust the ingredients to the concentration. Or, consider removing [:S:1llJ] during the addition of quicklime, and preliminarily remove (S) during tapping from the converter.
A method is used to keep the concentration high.
又第３図に示すごとく、生石灰添加と共に、添加後の鋼
中（Ｈ）は十ｙｌする。従って機械構造用ＳＣ材への鉛
添加の際は、鉛添加後、真空脱ガス設備を用いて、脱（
Ｈ）精錬を実施する必要がある。又前記特願昭５８−１
５５４９０号のように金属鉛と酸化鉛との混合だけでは
、見掛−１−の金属鉛の比重をあまり小さくとれないと
いう難点を有する。Moreover, as shown in FIG. 3, with the addition of quicklime, the content (H) in the steel after addition is 10 yl. Therefore, when adding lead to SC materials for mechanical structures, use vacuum degassing equipment to remove (
H) It is necessary to carry out refining. Also, the above-mentioned patent application Sho 58-1
If only the metallic lead and lead oxide are mixed as in No. 55490, the specific gravity of the metallic lead of apparent -1- cannot be made very small.
問題点を解決するための手段
本発明は前記状況に鑑みてなされたもので、溶鋼中に、
鉛含有物質を添加する際、比重の大きい金属鉛の見掛け
」−の比重（嵩比重）を小さくして、配管内搬送を容易
にし、かつ、溶鋼への均一分散を計ると共に、従来金属
鉛と混合して用いられている生石灰による脱Ｓ反応を極
力抑制する目的で、生石灰の大半を酸化鉛に置き替えた
ものである。そして金属鉛、酸化鉛、生石灰王者の混合
比率を規定することにより、前記目的を効率良く達成す
るものである。Means for Solving the Problems The present invention was made in view of the above-mentioned situation.
When adding lead-containing substances, we reduce the apparent specific gravity (bulk specific gravity) of metallic lead, which has a high specific gravity, to facilitate transportation in piping and to ensure uniform dispersion into molten steel. Most of the quicklime is replaced with lead oxide in order to suppress as much as possible the desulfurization reaction caused by the quicklime used in the mixture. By specifying the mixing ratio of metallic lead, lead oxide, and quicklime, the above object can be efficiently achieved.
本発明では、比重の大きい金属鉛を見掛」−その比重を
軽減する物質として、酸化鉛と生石灰を併用し、１１一
つ下記に示す０〜０式の範囲内に規定された領域で生石
灰を使用するため、従来法と比較し、極めて少量の生石
灰使用量となり、上記の生石灰により、脱〔Ｓ〕、〔Ｈ
〕ピックアップの問題は回避できる。In the present invention, lead oxide and quicklime are used together as substances to reduce the apparent specific gravity of metallic lead, which has a large specific gravity. Compared to the conventional method, the amount of quicklime used is extremely small.
] The pickup problem can be avoided.
ｘ＋ｙ＋ｚ＝１ ・−・０式５．５ｘ
＋ ３．３ｙ ＋ ｚ≦５．０ −−−■式ｘ、ｙ、
ｚは各々金属鉛粉、酸化鉛粉、生石灰粉の重量割合を示
す。上式■式、０式は混合物の総ての重量割合の和が１
及び各々の重量割合が１未満であることを示す式であり
、■式にｚ＝１−（Ｘ＋３＋）を代入することにより、
Ｘ、ｙの量比を規定することができる。x+y+z=1 ・-・0 formula 5.5x
+ 3.3y + z≦5.0 --- ■Formula x, y,
z indicates the weight percentage of metal lead powder, lead oxide powder, and quicklime powder, respectively. In the above equations ■ and 0, the sum of all weight proportions of the mixture is 1.
and the weight ratio of each is less than 1, and by substituting z=1-(X+3+) into the formula,
The quantitative ratio of X and y can be defined.
■式は、粉体混合物の平均嵩比重が、５．０以下であれ
ば、安定した搬送及び溶鋼中への均一分散を可能となる
ことを示す実験式である。Equation (2) is an experimental equation showing that stable transportation and uniform dispersion into molten steel are possible if the average bulk specific gravity of the powder mixture is 5.0 or less.
混合物の平均嵩比重と、搬送や均−分散などの操業の安
定度合の関係を第１図に示す。Figure 1 shows the relationship between the average bulk specific gravity of the mixture and the stability of operations such as conveyance and uniform dispersion.
操業の安定度合は、混合物の平均嵩比重が小さいほど良
好で、平均嵩比重が大きくなると不良となる。そして、
平均嵩比重が５．０を境に操業安定度が急激に悪化する
。従って混合物の平均嵩比重は５．０以下が良い。The lower the average bulk specific gravity of the mixture, the better the operational stability, and the higher the average bulk specific gravity, the worse. and,
The operational stability deteriorates rapidly when the average bulk specific gravity reaches 5.0. Therefore, the average bulk specific gravity of the mixture is preferably 5.0 or less.
平均嵩比重が５．０を超えると、特に配管内搬送が不能
に陥ることがある。If the average bulk specific gravity exceeds 5.0, transportation within piping may become impossible.
前記■式におけるｘ、ｙの係数５．５．３．３は生石灰
粉（２５０ｍｅｓｈより細かい微粉）の平均嵩比重１０
に幻する金属鉛粉（０，０４〜０．５０ｍｍ）と醇化鉛
粉（０，０４〜１．００ｍｍ）の夫々の平均嵩比重を示
す。The coefficients 5.5.3.3 of x and y in the above formula
The average bulk specific gravity of metallic lead powder (0.04 to 0.50 mm) and liquefied lead powder (0.04 to 1.00 mm) are shown.
インジェクション法による鉛含有物質の吹込条ヂ１１′
ｉ、、対象溶！′ｉ１Ｊ＋１により異なり、特に限定き
れるものではないが、１業規模においては下記の条件が
望ましい範囲である。Injection of lead-containing material by injection method 11'
i,, target melt! Although it varies depending on 'i1J+1 and is not particularly limited, the following conditions are desirable for a single industry scale.
（１）搬送ソｊス流量≦８ＯＮｍ”／Ｈ（スプラッシュ
防止の為）
（５）ブロータンク吹込圧力≦］Ｏｋｇ／ｃｍ’（高圧
設備にしない）
（６）金属鉛粉サイズ、平均嵩比重及びバラツキ０．０
４〜０．５ｍ／ｍ、５．５．５．０〜６．０（７）酸化
鉛粉サイズ、平均嵩比重及びバラツキ０．０４−１．０
ｍ／ｍ、３，３．２．９−３．７（８）生石灰粉サイズ
、平均嵩比重及びバラツキ２５０ｍｅｓｈ以下、 １．
０、０．８〜１．２以」二の吹込条件で実施すればラン
スノズルの詰り、吹込みガスによる溶鋼の飛散を防ぎ安
定して鉛を溶鋼中に吹込むことができる。(1) Transfer source flow rate≦8ONm”/H (to prevent splash) (5) Blow tank blowing pressure≦]Okg/cm’ (do not use high-pressure equipment) (6) Metal lead powder size, average bulk specific gravity, and Variation 0.0
4-0.5m/m, 5.5.5.0-6.0 (7) Lead oxide powder size, average bulk specific gravity and variation 0.04-1.0
m/m, 3, 3.2.9-3.7 (8) Quicklime powder size, average bulk specific gravity and variation 250 mesh or less, 1.
If lead is carried out under the second blowing condition of 0.8 to 1.2 or more, lead can be stably blown into molten steel by preventing clogging of the lance nozzle and scattering of molten steel by the blown gas.
実施例１
（低度高（Ｓ）鋼への鉛添加の例）
（１）取鍋内溶鋼昂 １００．０１−ン（２
）金属鉛粉添加量（サイズ） ２８５ｋｇ／Ｃｈ（０
，０５〜０．２ｍ＃ｎ）
（３）酸化鉛粉添加量（サイズ） １６０ｋｇ／ｃｈ
（０，１〜３．４ｍ／ｍ）
（４）生石灰添加量 ２０Ｊ／ａｈ （＜ ２５０
ｍｅｓｈ）（５）平均嵩比重 ４．６８
（６）吹込み時間 ４分
上記添加条件により金属鉛と酸化鉛と生石灰粉を混合添
加した添加前後の成分、温度は第１表に示し、添加後Ｐ
ｂ＝ ０．３２５％となり、鉛雄加歩留は７５．５％で
あった。また（Ｓ）、ＣＨ）濃度の変化はなく安定して
いた。鉛添加後、弯曲型ブルーム連続鋳造機で、２４７
Ｘ ３００ｍ／ｍサイズの良好なブルーム９７．８１−
ンを得ることができた。Example 1 (Example of lead addition to low-strength (S) steel) (1) Molten steel in ladle 100.01-n (2
) Metallic lead powder addition amount (size) 285kg/Ch (0
,05~0.2m#n) (3) Lead oxide powder addition amount (size) 160kg/ch
(0.1~3.4m/m) (4) Quicklime addition amount 20J/ah (< 250
mesh) (5) Average bulk specific gravity 4.68 (6) Blow time 4 minutes Metal lead, lead oxide, and quicklime powder were mixed and added according to the above addition conditions.The components and temperatures before and after addition are shown in Table 1. P
b=0.325%, and the lead yield was 75.5%. In addition, there was no change in (S), CH) concentration and it was stable. After adding lead, 247
X 300m/m size good bloom 97.81-
I was able to obtain the following information.
実施例２
（高次ＡＱ−３ｉキルド鋼への鉛添加の例）（１）取鍋
内溶鋼星 １０２．５１−ン（２）金属鉛
粉添加量（サイズ） １７５ｋｇ／ｃｈ（０，０５〜
０．２ｍ／ｍ）
（３）醇化鉛粉添加量（サイズ） １００ｋｇ／ｃｈ
（０，１〜０．４ｍ／ｍ）
（４）生石灰粉添加量（サイズ） ２０ｋｇ／ｃｈ（
＜ ２５０ｍｅｓｈ）
（５）平均嵩比重 ４．５８
（６）吹込みＡｒカス量 ８ＯＮｍ”／ｈｒ（７）吹
込み時間 ８分
機械構造用高炭素Ａσ−８１キルド鋼へ、］−記添加条
件により金属鉛と酸化鉛と生石灰粉の混合粉添加を行な
った。添加前後の成分・温度を第２表に示す。添加後Ｐ
ｂ＝ ０．２１０％となり、鉛添加歩留は８０．５％で
あった。添加中に（Ｓ）と〔Ｈ〕の濃度変化はなく、成
分としては安定していた。鉛添加後弯曲型プルーム連続
鋳造機で２４７Ｘ ３００サイズの良好なブルーム＋０
０．５ ｔを得ることができた。Example 2 (Example of lead addition to high-order AQ-3i killed steel) (1) Molten steel star in ladle 102.51-ton (2) Amount of metal lead powder added (size) 175 kg/ch (0.05 ~
0.2m/m) (3) Lead oxidized powder addition amount (size) 100kg/ch
(0.1~0.4m/m) (4) Quicklime powder addition amount (size) 20kg/ch (
< 250 mesh) (5) Average bulk specific gravity 4.58 (6) Amount of blown Ar scum 8 ONm"/hr (7) Blow time 8 minutes To high carbon Aσ-81 killed steel for machine structures, ]-according to the addition conditions A mixed powder of metallic lead, lead oxide, and quicklime powder was added.The components and temperatures before and after addition are shown in Table 2.After addition, P
b=0.210%, and the lead addition yield was 80.5%. There was no change in the concentrations of (S) and [H] during the addition, and the components were stable. Good bloom of 247X 300 size +0 with curved plume continuous casting machine after lead addition
We were able to obtain 0.5 t.
発明の効果
本発明によれば、溶鋼への鉛含有物を添加時、配管内詰
りをなくし、溶鋼中へ均一に分散させうると共に、脱Ｓ
反応を抑制することができ操業の安定を計ることができ
る。即ち、従来生石灰による脱Ｓ反応を考慮し、予じめ
前工程で鋼中〔Ｓ〕濃度を調整しておくか、あるいは鉛
添加後に〔Ｓ〕の成分調整を実施していたが、その必要
をなくすることができる。Effects of the Invention According to the present invention, when lead-containing substances are added to molten steel, it is possible to eliminate clogging in the pipes, uniformly disperse them in the molten steel, and to remove S.
Reactions can be suppressed and operations can be stabilized. In other words, in the past, considering the desulfurization reaction caused by quicklime, the [S] concentration in the steel was adjusted in advance in the previous process, or the [S] composition was adjusted after lead was added, but this was not necessary. can be eliminated.
又従来の金属鉛と生石灰との混合では、機械構造用鋼材
において（Ｈ）を特に嫌う鋼材において、鉛添加後、真
空脱ガス処理を施して、脱〔Ｈ〕する必要があったが、
本発明では生石灰使用量が極めて少ないため、鉛添加前
後の（Ｈ）濃度の−Ｊ−昇はほとんどなく、特に脱（Ｈ
）精錬の必要はない。In addition, in the conventional mixing of metallic lead and quicklime, it was necessary to perform vacuum degassing treatment to remove [H] after adding lead in steel materials for machine structural use that particularly dislike (H).
In the present invention, since the amount of quicklime used is extremely small, there is almost no -J- increase in the (H) concentration before and after the addition of lead, and in particular the removal of (H)
) No need for refining.
第１図は金属鉛、酸化鉛、生石灰の混合物の平均比重と
操業安定度の関係を示すグラフ、第２図は生石灰原単位
と脱（Ｓ）率の関係を示すグラフ、第３図は生石灰原単
位と処理中（）ｆ）ピックアツプ量の関係を示すグラフ
である。Figure 1 is a graph showing the relationship between the average specific gravity of a mixture of metallic lead, lead oxide, and quicklime and operational stability. Figure 2 is a graph showing the relationship between quicklime consumption rate and removal (S) rate. Figure 3 is quicklime. It is a graph showing the relationship between the basic unit and the amount of pick-up during processing ()f.
Claims (1)
と生石灰を下記（１）、（２）、（３）式を満足する範
囲内の量を混合して添加することを特徴とする鉛含有物
質の添加方法。 ｘ＋ｙ＋ｚ＝１・・・（１）式 ５．５ｘ＋３．３ｙ＋ｚ≦５．０・・・（２）式 ｛０＜ｘ＜１、０＜ｙ＜１、０＜ｚ＜１｝・・・（３）
式 （但し、ｘ：金属鉛粉の重量割合 ｙ：酸化鉛粉の重量割合 ｚ：生石灰粉の重量割合を表わす。）[Claims] When adding a lead-containing substance to molten steel, metallic lead, lead oxide, and quicklime are mixed in amounts that satisfy the following formulas (1), (2), and (3). A method for adding a lead-containing substance, characterized in that the lead-containing substance is added. x+y+z=1...(1) Formula 5.5x+3.3y+z≦5.0...(2) Formula {0<x<1, 0<y<1, 0<z<1}...(3 )
Formula (where x: weight percentage of metal lead powder y: weight percentage of lead oxide powder z: weight percentage of quicklime powder)
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60095898A JPS61257414A (en) | 1985-05-08 | 1985-05-08 | Adding method for lead-containing material |
| CA000501890A CA1281551C (en) | 1985-02-18 | 1986-02-14 | Method for addition of low-melting point metal |
| ES552064A ES8701237A1 (en) | 1985-02-18 | 1986-02-17 | Method for addition of low-melting point metal to molten steel. |
| BR8600660A BR8600660A (en) | 1985-02-18 | 1986-02-17 | PROCESS FOR ADDING A LOW MELTING METAL TO LIQUID STEEL INSIDE A CAMB |
| KR1019860001087A KR900006686B1 (en) | 1985-02-18 | 1986-02-17 | Method for addition of low-melting point metal to molten seel |
| EP86102077A EP0192240B1 (en) | 1985-02-18 | 1986-02-18 | Method for addition of low-melting point metal to molten steel |
| AU53683/86A AU562810B2 (en) | 1985-02-18 | 1986-02-18 | Addition of pb/bi to steel |
| DE8686102077T DE3664926D1 (en) | 1985-02-18 | 1986-02-18 | Method for addition of low-melting point metal to molten steel |
| MX001581A MX169867B (en) | 1985-02-18 | 1986-02-18 | METHOD FOR PRODUCING A MACHINABLE STEEL THROUGH ADDITION UNDER LEAD OR BISMUTE MELTING POINT TO A LIQUID STEEL |
| DE198686102077T DE192240T1 (en) | 1985-02-18 | 1986-02-18 | METHOD FOR ADDING LOW-MELTING METAL TO MELTED STEEL. |
| US06/865,472 US4686081A (en) | 1985-02-18 | 1986-05-21 | Method for addition of low-melting point metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60095898A JPS61257414A (en) | 1985-05-08 | 1985-05-08 | Adding method for lead-containing material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61257414A true JPS61257414A (en) | 1986-11-14 |
| JPH0144763B2 JPH0144763B2 (en) | 1989-09-29 |
Family
ID=14150120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60095898A Granted JPS61257414A (en) | 1985-02-18 | 1985-05-08 | Adding method for lead-containing material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61257414A (en) |
-
1985
- 1985-05-08 JP JP60095898A patent/JPS61257414A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0144763B2 (en) | 1989-09-29 |
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