JPH0144763B2 - - Google Patents
Info
- Publication number
- JPH0144763B2 JPH0144763B2 JP9589885A JP9589885A JPH0144763B2 JP H0144763 B2 JPH0144763 B2 JP H0144763B2 JP 9589885 A JP9589885 A JP 9589885A JP 9589885 A JP9589885 A JP 9589885A JP H0144763 B2 JPH0144763 B2 JP H0144763B2
- Authority
- JP
- Japan
- Prior art keywords
- lead
- quicklime
- steel
- specific gravity
- powder
- 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
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)
Description
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。
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。
(1) 溶鋼を鋼塊鋳型に注入中に添加する。
(2) 取鍋の底よりAr又はN2ガスのような不活性
ガスを吸き込み撹拌しながら鉛含有物質を上方
より添加する。
(3) インジエクシヨ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。
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。
そして、インジエクシヨンランスを用いて鉛含
有物質を添加す場合、金属鉛単体では比重が約
11.2と重いことから、見掛け上の比重を軽くする
ために生石灰と混合し、インジエクシヨンする方
法が知られている。（鉄と鋼No.４、Vol.68、
MAR.1982、’82−S253）。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。
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〕フラツクスで
ある為に、機械構造用Al−Siキルド鋼に鉛を添
加する場合、あるいは低炭〔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
炭〔Ｓ〕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、品質上問題となる。
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〔Ｈ〕濃度が上昇する。特に機械構造
用鋼材は鋼中〔Ｈ〕を嫌うため生石灰の特別な管
理が必要となる。従つ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。
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（低炭〔Ｓ〕快削鋼）
であり、鋼中〔Ｓ〕濃度は0.320〜0.330％の高
〔Ｓ〕である。生石灰添加量が増加するほど脱
〔Ｓ〕率は増加し、約10Kg／ｔ−ｓの生石灰量で
25％の脱〔Ｓ〕率である。従つて、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〕濃度に成分調整を行
なう。または生石灰添加中の脱〔Ｓ〕巾を考慮
し、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。
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〕は上昇する。従つて機械構造用
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58−155490号のように金属鉛と
酸化鉛との混合だけでは、見掛上の金属鉛の比重
をあまり小さくとれないという難点を有する。
問題点を解決するための手段
本発明は前記状況に鑑みなされたもので、溶鋼
中に、鉛含有物質を添加する際、比重の大きい金
属鉛の見掛け上の比重（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、生石灰三者の混合比
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。
本発明では、比重の大きい金属鉛を見掛上その
比重を軽減する物質として、酸化鉛と生石灰を併
用し、且つ下記に示す〜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〕ピツクアツプの問題
は回避できる。
ｘ＋ｙ＋ｚ＝１ ……式
5.5x＋3.3y＋ｚ≦5.0 ……式
０＜ｘ＜１
０＜ｙ＜１
０＜ｚ＜１ ……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、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＋ｙ）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。
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。
混合物の平均嵩比重と、搬送や均一分散などの
操業の安定度合の関係を第１図に示す。
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。従つて混合物の平均嵩比重
は5.0以下が良い。
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。
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
1.0に対する金属鉛粉（0.04〜0.50mm）と酸化鉛粉
（0.04〜1.00mm）の夫々の平均嵩比重を示す。
インジエクシヨン法による鉛含有物質の吸込条
件は、対象溶鋼量により異なり、特に限定されも
のではないが、工業規模においては下記の条件が
望ましい範囲である。
(1) 搬送ガス流量≦80Nm3／Ｈ（スプラツシユ
防止の為）
(2) 鉛搬送速度≧60Kg／min
(3) インジエクシヨン時間≦20分
(3) インジエクシヨン時間≦20分
(4) 固気比≧30（処理時間を短縮しランス寿命を延長
する為）
(5) ブロータンク吸込圧力≦10Kg／cm2（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
0.04〜0.5ｍ／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
0.04〜1.0ｍ／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
以上の吸込条件で実施すればランスノズルの詰
り、吸込みガスによる溶鋼の飛散を防ぎ安定して
鉛を溶鋼中に吸込むことができる。
実施例 １
（低炭高〔Ｓ〕鋼への鉛添加の例）
(1) 取鍋内溶鋼量 100.0トン
(2) 金属鉛粉添加量（サイズ） 285Kg／ch（0.05
〜0.2ｍ／ｍ）
(3) 酸化鉛粉添加量（サイズ） 160Kg／ch（0.1
〜0.4ｍ／ｍ）
(4) 生石灰添加量 20Kg／ch（＜250mesh）
(5) 平均嵩比重 4.69
(6) 吸込み時間 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Pb＝0.325％となり、鉛添加歩留は
75.5％であつた。また〔Ｓ〕、〔Ｈ〕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、247×300ｍ／ｍサイズの良好なブル
ーム97.8トンを得ることができた。
実施例 ２
（高炭Al−Siキルド鋼への鉛添加の例）
(1) 取鍋内溶鋼量 102.5トン
(2) 金属鉛粉添加量（サイズ） 175Kg／ch（0.05
〜0.2ｍ／ｍ）
(3) 酸化鉛粉添加量（サイズ） 100Kg／ch（0.1
〜0.4ｍ／ｍ）
(4) 生石灰添加量（サイズ） 20Kg／ch（＜
250mesh）
(5) 平均嵩比重 4.58
(6) 吸込みArガス量 60Nm3／hr
(7) 吸込み時間 ８分
機械構造用高炭素Al−Siキルド鋼へ、上記添
加条件により金属鉛と酸化鉛と生石灰粉の混合粉
添加を行なつた。添加前後の成分・温度を第２表
に示す。添加後Pb＝0.210％となり、鉛添加歩留
は80.5％であつた。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
加後弯曲型ブルーム連続鋳造機で247×300サイズ
の良好なブルーム100.5tを得ることができた。
INDUSTRIAL APPLICATION FIELD OF THE INVENTION The present invention relates to a method for adding lead-containing substances to molten steel. BACKGROUND ART Fine lead-containing substances in steel exist either alone or in combination with sulfides, and these 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) Adding molten steel to a steel ingot mold during pouring. (2) Inhale an inert gas such as Ar or N2 gas from the bottom of the ladle and add the lead-containing substance from above while stirring. (3) Add the lead-containing material along with the inert gas using an injection lance. 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, making it difficult to obtain a steel material with uniform machinability, so method (3) is more common. When adding lead-containing substances using an injection lance, the specific gravity of metallic lead alone is approximately
Because it is heavy (11.2 kg), it is known to mix it with quicklime and inject it to reduce its apparent specific gravity. (Tetsu to Hagane No.4, Vol.68,
MAR.1982, '82−S253). Also, for the same purpose, a patent application was made in 1982 to add a mixture of metallic lead and lead oxide.
- Proposed in No. 155490. Problems to be Solved by the Invention However, since quicklime is usually free of [S] flux, it is difficult to add lead to Al-Si killed steel for machine structures or to low-carbon [S] free-cutting steel. Even when S is added, the de[S] reaction progresses, especially in low carbon [S] free-cutting steel, because there is an [S] standard.
Inappropriate ingredients are likely to occur, which poses a quality problem.
Furthermore, since quicklime is highly hygroscopic, when a large amount of quicklime is added to molten steel, the water in the quicklime is dissociated and the [H] concentration in the steel increases. In particular, steel materials for machine structures dislike [H] in the steel, so special management of quicklime is required. Therefore, it is desirable to reduce the amount of quicklime used as much as possible. Here, the relationship between quicklime consumption rate and [S] removal rate is shown in Figure 2. Steel type is SUM series (low carbon [S] free-cutting steel)
The [S] concentration in the steel is as high as 0.320 to 0.330%. As the amount of quicklime added increases, the [S] removal rate increases, and with an amount of quicklime of about 10 kg/t-s
The elimination rate is 25%. Therefore, in the actual manufacturing process, high purity sulfide steel or Fe
-S is added and the components are adjusted to a predetermined [S] concentration. Alternatively, a method is adopted in which the [S] concentration is increased in advance during steel tapping from the converter, taking into account the width of [S] removed during the addition of quicklime. Moreover, as shown in FIG. 3, as quicklime is added, [H] in the steel increases after addition. Therefore for mechanical construction
When adding lead to SC materials, it is necessary to perform de[H] refining using vacuum degassing equipment after adding lead. Furthermore, as in the above-mentioned Japanese Patent Application No. 155490/1980, simply mixing metallic lead and lead oxide has the disadvantage that the apparent specific gravity of metallic lead cannot be made very small. Means for Solving the Problems The present invention was made in view of the above situation, and when adding a lead-containing substance to molten steel, the apparent specific gravity (bulk specific gravity) of metal lead, which has a large specific gravity, is reduced. ,
Most of the quicklime has been replaced with lead oxide in order to facilitate transportation within the pipes, ensure uniform dispersion into molten steel, and to suppress as much as possible the desulfurization reaction caused by quicklime, which is conventionally mixed with metallic lead. It is something that By specifying the mixing ratio of metallic lead, lead oxide, and quicklime, the above object can be efficiently achieved. In the present invention, lead oxide and quicklime are used together as substances that apparently reduce the specific gravity of metal lead, which has a large specific gravity, and quicklime is used in the range specified by the formula ~ shown below. Compared to the conventional method, the amount of quicklime used is extremely small, and the problems of removing [S] and picking up [H] can be avoided by using the above-mentioned quicklime. x+y+z=1...Formula 5.5x+3.3y+z≦5.0...Formula 0<x<1 0<y<1 0<z<1...Formula x, y, and z are metallic lead powder, lead oxide powder, and quicklime powder, respectively. The weight percentage is shown. The above formula, the formula shows that the sum of all weight proportions of the mixture is 1 and each weight proportion is 1.
This is a formula showing that z=1−
By substituting (x+y), the quantitative ratio of x and y can be defined. The formula is an empirical formula 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. Figure 1 shows the relationship between the average bulk specific gravity of the mixture and the stability of operations such as transportation and uniform dispersion. 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. Then, 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. If the average bulk specific gravity exceeds 5.0, transportation within piping may become impossible. The coefficients 5.5 and 3.3 for x and y in the above equation are the average bulk specific gravity of quicklime powder (fine powder finer than 250 mesh)
The average bulk specific gravity of metal lead powder (0.04 to 0.50 mm) and lead oxide powder (0.04 to 1.00 mm) relative to 1.0 is shown. The conditions for suctioning lead-containing substances by the injection method vary depending on the amount of molten steel and are not particularly limited, but on an industrial scale, the following conditions are desirable. (1) Carrier gas flow rate ≦80Nm 3 /H (to prevent splash) (2) Lead conveyance speed ≧60Kg/min (3) Injection time ≦20 minutes (3) Injection time ≦20 minutes (4) Solid-gas ratio ≧ 30 (To shorten processing time and extend lance life) (5) Blow tank suction pressure ≦10Kg/cm 2 (Do not use high pressure equipment) (6) Metal lead powder size, average bulk specific gravity, and variation
0.04~0.5m/m, 5.5, 5.0~6.0 (7) Lead oxide powder size, average bulk specific gravity, and variation
0.04~1.0m/m, 3.3, 2.9~3.7 (8) Quicklime powder size, average bulk specific gravity, and variation
If carried out under suction conditions of 250mesh or less, 1.0, 0.8 to 1.2 or more, lead can be stably sucked into the molten steel by preventing clogging of the lance nozzle and scattering of the molten steel by the suction gas. Example 1 (Example of lead addition to low coal high [S] steel) (1) Amount of molten steel in ladle 100.0 tons (2) Amount of metal lead powder added (size) 285Kg/ch (0.05
~0.2m/m) (3) Lead oxide powder addition amount (size) 160Kg/ch (0.1
~0.4m/m) (4) Quicklime addition amount 20Kg/ch (<250mesh) (5) Average bulk specific gravity 4.69 (6) Suction time 4 minutes Addition of a mixture of metallic lead, lead oxide, and quicklime powder according to the above addition conditions The components and temperatures before and after are shown in Table 1. After addition, Pb = 0.325%, and the lead addition yield is
It was 75.5%. In addition, the [S] and [H] concentrations did not change and were stable. After adding lead, we were able to obtain 97.8 tons of good bloom with a size of 247 x 300 m/m using a curved bloom continuous casting machine. Example 2 (Example of lead addition to high carbon Al-Si killed steel) (1) Amount of molten steel in ladle 102.5 tons (2) Amount of metal lead powder added (size) 175Kg/ch (0.05
~0.2m/m) (3) Lead oxide powder addition amount (size) 100Kg/ch (0.1
~0.4m/m) (4) Quicklime addition amount (size) 20Kg/ch (<
(250mesh) (5) Average bulk specific gravity 4.58 (6) Suction Ar gas amount 60Nm 3 /hr (7) Suction time 8 minutes Metallic lead, lead oxide, and quicklime are added to high carbon Al-Si killed steel for machine structures according to the above addition conditions. A mixed powder of powder was added. Table 2 shows the ingredients and temperatures before and after addition. After addition, Pb was 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. We were able to obtain 100.5 tons of good bloom with a size of 247 x 300 using a curved bloom continuous casting machine after adding lead.
【表】【table】
【表】
発明の効果
本発明によれば、溶鋼への鉛含有物質を添加
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。
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〕する必要があつたが、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
度の上昇はほとんどなく、特に脱〔Ｈ〕精錬の必
要はない。[Table] Effects of the Invention According to the present invention, when a lead-containing substance is added to molten steel, it is possible to eliminate clogging in the piping and uniformly disperse it in the molten steel, and to suppress the de-S reaction, resulting in stable operation. can be measured. 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. 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 mechanical structures that particularly dislike [H]. In the invention, since the amount of quicklime used is extremely small, there is almost no increase in [H] concentration before and after adding lead, and there is no need for de[H] 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〔Ｈ〕ピツク
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 and [S] removal rate. Figure 3 is a graph showing the relationship between quicklime consumption and [S] removal rate. It is a graph showing the relationship between the basic unit and the amount of [H] pickups being processed.
Claims (1)
鉛と酸化鉛と生石灰を下記、、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 ……式 5.5x＋3.3y＋ｚ≦5.0 ……式 ０＜ｘ＜１ ０＜ｙ＜１ ０＜ｚ＜１ ……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] 1. When adding a lead-containing substance to molten steel, metal lead, lead oxide, and quicklime are mixed and added in amounts that satisfy the following formula. How to add lead-containing substances. x+y+z=1...Formula 5.5x+3.3y+z≦5.0...Formula 0<x<1 0<y<1 0<z<1...Formula (where x: Weight percentage of metal lead powder y: Weight percentage of lead oxide powder Weight percentage z: represents the 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 |
| KR1019860001087A KR900006686B1 (en) | 1985-02-18 | 1986-02-17 | Method for addition of low-melting point metal to molten seel |
| BR8600660A BR8600660A (en) | 1985-02-18 | 1986-02-17 | PROCESS FOR ADDING A LOW MELTING METAL TO LIQUID STEEL INSIDE A CAMB |
| ES552064A ES8701237A1 (en) | 1985-02-18 | 1986-02-17 | 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. |
| EP86102077A EP0192240B1 (en) | 1985-02-18 | 1986-02-18 | Method for addition of low-melting point metal to molten steel |
| DE8686102077T DE3664926D1 (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 |
| 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 JPS61257414A (en) | 1986-11-14 |
| JPH0144763B2 true 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 |
|---|---|
| JPS61257414A (en) | 1986-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2455802A1 (en) | DESULFURIZATION OF STEEL | |
| EP0192240B1 (en) | Method for addition of low-melting point metal to molten steel | |
| JPS6250054A (en) | Continuous casting method for obtaining ingot having high oxygen content | |
| US3058822A (en) | Method of making additions to molten metal | |
| US4203763A (en) | Method of manufacturing a lead alloy steel and a steel made according to the method | |
| JPH0256406B2 (en) | ||
| JPS61257414A (en) | Adding method for lead-containing material | |
| JP2673057B2 (en) | Deoxidizer for molten iron and molten steel refining | |
| EP0163784B1 (en) | Two stage deoxidation process in steel-making | |
| JPH07224317A (en) | High-cleanliness steel manufacturing method | |
| JP5326201B2 (en) | Method for melting aluminum killed steel | |
| JPH0143808B2 (en) | ||
| JPH02213446A (en) | Machine-cutting soft steel and its manufacture | |
| SU1744122A1 (en) | Process of melting and out-of-furnace treatment of steel | |
| SU1071655A1 (en) | Method of preparing alumminium-magnesium alloys | |
| SU1719435A1 (en) | Method of making steel in converter | |
| JP2004344891A (en) | Ca ADDING METHOD IN CONTINUOUS CASTING OF BILLET | |
| SU1049551A1 (en) | Method for smelting steel in converter | |
| SU1774957A3 (en) | Method of processing cast iron outside furnace | |
| SU598944A1 (en) | Method of producing steel | |
| JPH09209026A (en) | Simultaneous deoxidation desulfurization agent for molten steel and method for simultaneous deoxidation desulfurization of molten steel using the same | |
| RU2000336C1 (en) | Method of treating molten steel | |
| RU1768647C (en) | Method of steel melting in converter | |
| JPH03202440A (en) | Method for adding low melting heavy metal to molten steel | |
| SU996070A1 (en) | Steel ingot production method |