JPH09287016A - Stainless steel melting method - Google Patents
Stainless steel melting methodInfo
- Publication number
- JPH09287016A JPH09287016A JP9883296A JP9883296A JPH09287016A JP H09287016 A JPH09287016 A JP H09287016A JP 9883296 A JP9883296 A JP 9883296A JP 9883296 A JP9883296 A JP 9883296A JP H09287016 A JPH09287016 A JP H09287016A
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- JP
- Japan
- Prior art keywords
- period
- vacuum
- gas
- torr
- ton
- 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.)
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
(57)【要約】
【課題】 高温の塩水環境下にあっても、カルシウムア
ルミネートに起因する微細孔を生成するおそれがない耐
食性に優れたステンレス鋼を得るための真空脱ガス溶製
方法を提供する。
【解決手段】 転炉出鋼後のステンレス溶鋼に取鍋内真
空脱ガス精錬を施すに当たり、溶鋼中への攪拌用ガスの
供給と、上吹きランスからの酸素ガスの供給が可能な、
大径直胴浸漬管型の真空脱ガス装置を用いて、上吹きラ
ンスからの酸素ガスの供給による脱炭を実施する脱炭期
の終了後に、真空度を２００〜３００Ｔｏｒｒ、攪拌用
ガスの供給量を４〜１０Ｎｌ／（分・トン）として、脱
炭期に生成したスラグを浸漬管外に排出させる排出期を
設け、引き続き、真空度を５０〜１５０Ｔｏｒｒ、攪拌
用ガスの供給量を０．５〜３Ｎｌ／（分・トン）として
Ａｌを添加して脱酸する脱酸期を設ける。
(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a vacuum degassing melting method for obtaining stainless steel excellent in corrosion resistance, which is free from the possibility of forming fine pores due to calcium aluminate even in a high temperature salt water environment. provide. SOLUTION: When performing vacuum degassing refining in a ladle on molten stainless steel after tapping of a converter, it is possible to supply stirring gas into molten steel and supply oxygen gas from an upper blowing lance,
After the end of the decarburization period in which the large-diameter straight-tube immersion tube type vacuum degasser is used to decarburize by supplying oxygen gas from the top lance, the degree of vacuum is 200 to 300 Torr and the amount of stirring gas supplied. Is set to 4 to 10 Nl / (min · ton), and a discharge period for discharging the slag generated in the decarburization period to the outside of the dipping pipe is provided, subsequently, the degree of vacuum is 50 to 150 Torr, and the supply amount of the stirring gas is 0.5. A deoxidation period is added in which Al is added as ˜3 Nl / (min · ton) to deoxidize.
Description
【０００１】[0001]
【発明の属する技術分野】本発明はステンレス鋼溶製方
法に関するものである。TECHNICAL FIELD The present invention relates to a method for melting stainless steel.
【０００２】[0002]
【従来の技術】フェライト系ステンレス鋼を溶製する場
合、一般に、炭素、窒素濃度を低下させることが必要な
ため、真空精錬が用いられている。最も広く用いられて
いる方法は、取鍋全体を真空容器に入れて酸素を上吹き
するＶＯＤ法である。しかし、ＶＯＤ法ではスラグが常
に溶鋼表面に存在しているため、脱炭期に生成したクロ
ム酸化物を還元し、かつ溶鋼を脱酸するためにＡｌを添
加すると、スラグに含まれていたＣａＯと脱酸により生
成したＡｌ2 Ｏ3 とにより、複合酸化物であるカルシウ
ムアルミネートが生成される。このカルシウムアルミネ
ートは水溶性のため、製品として使用時に、例えば温度
の高い塩水に長時間曝されるといった過酷な環境に曝さ
れる場合には、溶解して微小な孔を生成し、この孔を起
点として腐食が進行するという問題を生じる。2. Description of the Related Art In the case of smelting ferritic stainless steel, vacuum refining is generally used because it is necessary to reduce carbon and nitrogen concentrations. The most widely used method is the VOD method in which the entire ladle is placed in a vacuum container and oxygen is blown upward. However, in the VOD method, since slag is always present on the surface of molten steel, if Al is added to reduce the chromium oxide generated during the decarburization period and deoxidize the molten steel, CaO contained in the slag is removed. Calcium aluminate, which is a complex oxide, is generated by the Al 2 O 3 generated by deoxidation. Since this calcium aluminate is water-soluble, when it is used as a product, if it is exposed to a harsh environment such as high temperature salt water for a long time, it will dissolve and form minute pores. The problem arises that the corrosion progresses from the starting point.
【０００３】これに対して、ＲＨ・ＯＢ法で溶製する方
法があるが、この場合には脱炭期に真空槽内で生成した
スラグの一部は浸漬管外へ排出されるが、一部は残存す
るため、前記の問題点は完全には解決されない。さら
に、ＲＨ・ＯＢ法の場合は、真空槽内溶鋼の攪拌が弱い
ため脱炭期の時間が長く、生産性が低いという問題点が
ある。On the other hand, there is a method of smelting by the RH / OB method. In this case, a part of the slag generated in the vacuum tank during the decarburization period is discharged to the outside of the dipping pipe. Since the parts remain, the above problems cannot be completely solved. Further, in the case of the RH / OB method, there is a problem that the stirring time of the molten steel in the vacuum tank is weak and the decarburizing period is long and the productivity is low.
【０００４】特開昭６１−３７９１２号公報には、溶鋼
中への攪拌用ガスの供給と、上吹きランスからの酸素ガ
スの供給が可能な、大径直胴浸漬管型の真空脱ガス装置
を用いたステンレス鋼の溶製技術が開示されている。こ
の溶製技術は、真空槽内溶鋼を強攪拌することで高い生
産性が得られ、ＶＯＤ法と同等レベルの高速処理が可能
な上に、浸漬管方式であるから、ＲＨ・ＯＢ法と同様
に、脱炭期に真空槽内で生成したスラグが浸漬管外へ排
出される特徴を有している。しかし、単にこの方法で処
理しても、スラグの一部は浸漬管外へ排出されずに槽内
に残るため、カルシウムアルミネートの生成という問題
は依然として解決されない。Japanese Unexamined Patent Publication (Kokai) No. 61-37912 discloses a large-diameter straight-tube immersion tube type vacuum degassing apparatus capable of supplying a stirring gas into molten steel and an oxygen gas from an upper blowing lance. The melting technique of the used stainless steel is disclosed. This melting technology achieves high productivity by vigorously stirring molten steel in a vacuum tank, enables high-speed processing at the same level as the VOD method, and uses the immersion pipe method, so it is similar to the RH / OB method. In addition, the slag generated in the vacuum tank during the decarburization period is discharged to the outside of the immersion pipe. However, even if this method is simply used, a part of the slag remains in the tank without being discharged to the outside of the dip tube, and thus the problem of formation of calcium aluminate still remains unsolved.
【０００５】[0005]
【発明が解決しようとする課題】本発明はこのような従
来技術の問題点を排除し得るステンレス鋼溶製方法を提
供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a stainless steel melting method capable of eliminating the above problems of the prior art.
【０００６】[0006]
【課題を解決するための手段】本発明の要旨とするとこ
ろは、溶鋼中への攪拌用ガスの供給と、上吹きランスか
らの酸素ガスの供給が可能な、大径直胴浸漬管型の真空
脱ガス装置を用いて、上吹きランスからの酸素ガスの供
給による脱炭を実施する脱炭期の終了後に、真空度を２
００〜３００Ｔｏｒｒ、攪拌用ガスの供給量を４〜１０
Ｎｌ／（分・トン）として、前記脱炭期に生成したスラ
グを浸漬管外に排出させる排出期を設け、引き続き真空
度を５０〜１５０Ｔｏｒｒ、攪拌用ガスの供給量を０．
５〜３Ｎｌ／（分・トン）としてＡｌを添加して脱酸す
る脱酸期を設けることを特徴とするステンレス鋼溶製方
法にある。SUMMARY OF THE INVENTION The gist of the present invention is to provide a large-diameter straight-tube immersion tube type vacuum capable of supplying a stirring gas into molten steel and an oxygen gas from an upper blowing lance. After the decarburization period, in which degassing is performed by supplying oxygen gas from the upper blowing lance, the degree of vacuum is set to 2
0 to 300 Torr, the amount of stirring gas supplied is 4 to 10
As Nl / (min · ton), a discharge period is provided in which the slag generated in the decarburization period is discharged to the outside of the dipping pipe, the degree of vacuum is then 50 to 150 Torr, and the supply amount of the stirring gas is 0.
In the stainless steel melting method, a deoxidation period of adding Al as 5 to 3 Nl / (min · ton) to deoxidize is provided.
【０００７】[0007]
【発明の実施の形態】本発明を実施する装置の該略説明
図を図１に示し、この実施装置を用いて、脱炭期、スラ
グ排出期および脱酸期からなる本発明に従ったステンレ
ス鋼溶製工程における精錬の態様の説明図を図２（ａ〜
ｃ） に示す。図１及び２において、１は浸漬管、２は
取鍋、３は溶鋼、４は酸素上吹ランス、５は酸素ガス、
６は取鍋２の底部に設けた攪拌用ガス吹き込みのための
ポーラスレンガよりなる底吹羽口、７は底吹羽口６より
吹き込んだ攪拌用のガス気泡、８は脱炭期に生成したス
ラグである。BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a schematic explanatory view of an apparatus for carrying out the present invention. Using this apparatus, a stainless steel according to the present invention comprising a decarburizing period, a slag discharging period and a deoxidizing period. An explanatory view of the refining mode in the steel melting process is shown in FIG.
c). 1 and 2, 1 is a dip tube, 2 is a ladle, 3 is molten steel, 4 is an oxygen top blowing lance, 5 is oxygen gas,
6 is a bottom blower mouth made of porous brick provided at the bottom of the ladle 2 for blowing a stirring gas, 7 is a gas bubble for stirring blown from the bottom blower mouth 6, and 8 is generated in the decarburizing period. It is a slag.
【０００８】図２ａは脱炭期を示し、底吹羽口６から攪
拌用ガスを供給しつつ、酸素上吹きランス４より浸漬管
１内の溶鋼表面に酸素を吹き付け脱炭を行う。この場合
は生成したスラグ８の一部は浸漬管内に残留する。図２
ｂはスラグ排出期を示し、本発明に従い真空度を２００
〜３００ｔｏｒｒとするので、浸漬管１内の溶鋼表面の
高さは低下し、底吹羽口６から攪拌用ガスを供給するこ
とにより、脱炭期に生成したスラグ８は矢印方向に移動
して浸漬管１外に排出される。FIG. 2a shows a decarburization period, in which oxygen is blown from the oxygen top blowing lance 4 to the surface of the molten steel in the dipping pipe 1 while the stirring gas is being supplied from the bottom blowhole 6 to perform decarburization. In this case, a part of the generated slag 8 remains in the immersion pipe. FIG.
b indicates the slag discharge period, and the degree of vacuum is 200 according to the present invention.
Since it is set to ~ 300 torr, the height of the molten steel surface in the immersion pipe 1 is lowered, and by supplying the stirring gas from the bottom blowhole 6, the slag 8 generated in the decarburizing period moves in the arrow direction. It is discharged to the outside of the immersion pipe 1.
【０００９】図２ｃは脱酸期を示し、本発明に従い真空
度を５０〜１５０ｔｏｒｒとするので、浸漬管１内の溶
鋼表面の高さは再び高くなり、底吹羽口６から攪拌用ガ
スを供給しつつ脱酸材としてＡｌを添加するが、脱炭期
に生成したスラグ８は浸漬管１外に留まり、溶鋼には巻
き込まれない。本発明の溶製方法において、上吹きラン
スからの酸素ガスの供給による脱炭を実施する脱炭期の
終了後に、真空度を２００〜３００Ｔｏｒｒ、攪拌用ガ
スの供給量を４〜１０Ｎｌ／（分・トン）として、脱炭
期に生成したスラグを浸漬管外に排出させるのである
が、真空度および攪拌用ガスの供給量を前記のように限
定した理由は、真空度が２００Ｔｏｒｒよりも高真空の
場合には、図２ａに示す如く、浸漬管内の溶鋼面高さ
と、同浸漬管下端との距離が長いため、溶鋼の下降流に
よりスラグが浸漬管内溶鋼面から下方へ移動し浸漬管下
端から浸漬管外へと排除される過程において、浸漬管内
溶鋼面から浸漬管下端へ到達する頻度が低下するため、
排出効率が低下し、一方３００Ｔｏｒｒよりも低真空の
場合には、同一のガス流量であっても攪拌エネルギーが
真空度の低下に伴い低下するため、表面のスラグが溶鋼
に巻き込まれる頻度が低下し、排出効率が低下するから
であり、また攪拌用ガスの供給量が４Ｎｌ／（分・ト
ン）よりも少ない場合には、溶鋼の下降流が小さくなる
ため排出効率が低下し、一方１０Ｎｌ／（分・トン）よ
りも多い場合には、激しいスプラッシュが発生するため
操業上の問題が生じるからである。排出期真空度（Ｔｏ
ｒｒ）とスラブでのカルシウムアルミネート個数（個／
ｃｍ2 ）との関係を図３に示す。FIG. 2c shows the deoxidizing stage, and since the degree of vacuum is set to 50 to 150 torr according to the present invention, the height of the surface of the molten steel in the dip pipe 1 becomes high again, and the stirring gas is supplied from the bottom blowing port 6 to the stirring gas. Although Al is added as a deoxidizing material while being supplied, the slag 8 generated during the decarburizing period remains outside the dip pipe 1 and is not caught in the molten steel. In the melting method of the present invention, after the decarburization period in which the decarburization is performed by supplying the oxygen gas from the upper blowing lance, the degree of vacuum is 200 to 300 Torr and the supply amount of the stirring gas is 4 to 10 Nl / (min.・ Ton), the slag generated during the decarburization period is discharged to the outside of the dipping pipe. The reason why the vacuum degree and the supply amount of the stirring gas are limited as described above is that the vacuum degree is higher than 200 Torr. 2a, as shown in FIG. 2a, since the height of the molten steel surface in the immersion pipe and the distance from the lower end of the immersion pipe are long, the downward flow of molten steel causes the slag to move downward from the molten steel surface in the immersion pipe and In the process of being removed to the outside of the immersion pipe, the frequency of reaching the lower end of the immersion pipe from the molten steel surface in the immersion pipe decreases,
When the discharge efficiency decreases and the vacuum is lower than 300 Torr, the stirring energy decreases with the decrease of the vacuum degree even at the same gas flow rate, so the frequency of the surface slag being caught in the molten steel decreases. The discharge efficiency decreases, and when the supply amount of the stirring gas is less than 4 Nl / (min · ton), the discharge efficiency decreases because the downflow of molten steel decreases, while 10 Nl / ( If it is more than (min./ton), a violent splash will occur, causing operational problems. Vacuum level during discharge (To
rr) and the number of calcium aluminates in the slab (pieces /
The relationship with cm 2 ) is shown in FIG.
【００１０】本発明において、前記排出期に続き、真空
度を５０〜１５０Ｔｏｒｒ、攪拌用ガスの供給量を０．
５〜３Ｎｌ／（分・トン）としてＡｌを添加して脱酸す
る脱酸期を設ける理由を説明する。真空度が５０Ｔｏｒ
ｒよりも高真空の場合には、攪拌ガスの気泡が表面で破
泡する際の体積膨張が大きくなりすぎるためスプラッシ
ュが激しく発生し、他方１５０Ｔｏｒｒよりも低真空度
の場合には、浸漬管内溶鋼面高さと浸漬管下端との距離
が短いため、浸漬管内溶鋼の循環流動により、浸漬管外
の溶鋼が揺動し、添加されたＡｌと浸漬管外スラグが反
応するため、カルシウムアルミネートが生成するからで
あり、また攪拌用ガスの供給量が０．５Ｎｌ／（分・ト
ン）よりも少ない場合には、均一混合時間が長くなるた
め、脱酸時間が長時間となり、他方、３Ｎｌ／（分・ト
ン）よりも多い場合には、浸漬管内溶鋼の循環流動によ
り、浸漬管外の溶鋼が揺動し、添加されたＡｌと浸漬管
外スラグが反応してカルシウムアルミネートが生成する
からである。脱酸期真空度（Ｔｏｒｒ）とスラブでのカ
ルシウムアルミネート個数（個／ｃｍ2 ）との関係を図
４に示す。In the present invention, after the discharging period, the degree of vacuum is 50 to 150 Torr, and the supply amount of the stirring gas is 0.
The reason for providing a deoxidation period in which Al is added at 5 to 3 Nl / (min · ton) to deoxidize will be described. Vacuum degree is 50 Tor
When the vacuum is higher than r, the volume expansion when the bubbles of the stirring gas are ruptured on the surface becomes too large, so that the splash occurs violently. On the other hand, when the vacuum is lower than 150 Torr, the molten steel in the immersion pipe Since the distance between the surface height and the lower end of the immersion pipe is short, the molten steel outside the immersion pipe oscillates due to the circulating flow of the molten steel inside the immersion pipe, and the added Al reacts with the slag outside the immersion pipe to form calcium aluminate. In addition, when the supply amount of the stirring gas is less than 0.5 Nl / (min · ton), the uniform mixing time becomes long, and the deoxidizing time becomes long, while 3 Nl / ( If the amount is larger than (min / ton), the molten steel outside the dip pipe sways due to the circulating flow of the molten steel inside the dip pipe, and the added Al reacts with the slag outside the dip pipe to form calcium aluminate. is there. FIG. 4 shows the relationship between the deoxidizing vacuum degree (Torr) and the number of calcium aluminates (pieces / cm 2 ) in the slab.
【００１１】[0011]
【実施例】溶鋼中への攪拌用ガスの供給と上吹きランス
からの酸素ガスの供給が可能な、１５０トン規模の大径
直胴浸漬管型の真空脱ガス装置を用いて、浸漬管内に吸
い上げられたＣｒ：１６％、炭素：０．３％を含有する
転炉出鋼後の溶鋼に対して、上吹ランスから酸素ガスを
２０００Ｎｍ3 ／Ｈｒで供給するとともに、取鍋の底部
に設けたポーラスレンガよりなる底吹羽口から攪拌用Ａ
ｒガスを５５０Ｎｌ／分の流量で供給し、炭素濃度が
０．０５％までの脱炭を実施した（脱炭期）。その後、
真空度を２５０Ｔｏｒｒ、攪拌用ガスの供給量を１０５
０Ｎｌ／分として、脱炭期に生成したスラグを浸漬管外
に排出させる排出期を約２分間実施し、引き続き、真空
度を１００Ｔｏｒｒ、攪拌用ガスの供給量を１７５Ｎｌ
／分とした上でＡｌを添加して脱酸し、その状態で２分
間の脱酸期を設けた。その結果、スラグの排出率は９５
％に達し、スラブでのカルシウムアルミネート個数は０
個／ｃｍ2 であった。[Example] Using a large-diameter straight-tube dip-type vacuum degasser of 150 ton scale capable of supplying a stirring gas into molten steel and supplying an oxygen gas from an upper blowing lance, it is sucked into a dipping pipe. Oxygen gas was supplied at 2000 Nm 3 / Hr from the top blowing lance to the molten steel after being discharged from the converter containing Cr: 16% and carbon: 0.3%, and was provided at the bottom of the ladle. For stirring from the bottom blowhole made of porous brick A
R gas was supplied at a flow rate of 550 Nl / min to perform decarburization with a carbon concentration of up to 0.05% (decarburization period). afterwards,
The degree of vacuum is 250 Torr, and the supply amount of stirring gas is 105
The discharge period for discharging the slag generated in the decarburizing period to the outside of the dipping pipe was set to 0 Nl / min for about 2 minutes, and subsequently, the degree of vacuum was 100 Torr and the supply amount of the stirring gas was 175 Nl.
/ Min, and then Al was added to deoxidize, and a deoxidation period of 2 minutes was provided in that state. As a result, the slag emission rate is 95
%, And the number of calcium aluminates in the slab is 0
Pieces / cm 2 .
【００１２】[0012]
【発明の効果】本発明によれば、転炉出鋼後のステンレ
ス溶鋼の取鍋内真空脱ガス精錬により得られたスラブに
おいて、カルシウムアルミネートの生成がなく、従って
高温の塩水環境下にあっても、カルシウムアルミネート
に起因する微細孔を生成するおそれがない耐食性に優れ
たステンレス鋼を生産性良く製造することができるとい
う効果が奏される。EFFECTS OF THE INVENTION According to the present invention, the slab obtained by vacuum degassing refining of molten stainless steel after tapping the converter has no formation of calcium aluminate, and therefore is in a high-temperature salt water environment. However, there is an effect that it is possible to produce with high productivity stainless steel excellent in corrosion resistance without the possibility of forming fine pores due to calcium aluminate.
【図１】本発明を実施する装置の概略説明図である。FIG. 1 is a schematic explanatory view of an apparatus for carrying out the present invention.
【図２】本発明のステンレス溶鋼精錬工程の説明図で、
図２ａは脱炭期、同ｂは排出期、同ｃは脱酸期を示すも
のである。FIG. 2 is an explanatory view of a molten steel refining process of the present invention,
2a shows a decarburization period, FIG. 2b shows a discharge period, and FIG. 2c shows a deoxidation period.
１ 浸漬管 ２ 取鍋 ３ 溶鋼 ４ 上吹ランス ５ 酸素ガス ６ 底吹羽口 ７ 攪拌用のガス気泡 ８ スラグ 1 Immersion pipe 2 Ladle 3 Molten steel 4 Top blowing lance 5 Oxygen gas 6 Bottom blowing tuyer 7 Gas bubbles for stirring 8 Slag
【図３】スラグ排出期真空度（Ｔｏｒｒ）とスラブでの
カルシウムアルミネート個数（個／ｃｍ2 ）との関係を
示す図である。FIG. 3 is a diagram showing a relationship between a slag discharge stage vacuum degree (Torr) and the number of calcium aluminates in a slab (pieces / cm 2 ).
【図４】脱酸期真空度（Ｔｏｒｒ）とスラブでのカルシ
ウムアルミネート個数（個／ｃｍ2 ）との関係を示す図
である。FIG. 4 is a diagram showing the relationship between the deoxidizing vacuum degree (Torr) and the number of calcium aluminates in a slab (pieces / cm 2 ).
Claims (1)
ランスからの酸素ガスの供給が可能な、大径直胴浸漬管
型の真空脱ガス装置を用いて、上吹きランスからの酸素
ガスの供給による脱炭を実施する脱炭期の終了後に、真
空度を２００〜３００Ｔｏｒｒ、攪拌用ガスの供給量を
４〜１０Ｎｌ／（分・トン）として、前記脱炭期に生成
したスラグを浸漬管外に排出させる排出期を設け、引き
続き真空度を５０〜１５０Ｔｏｒｒ、攪拌用ガスの供給
量を０．５〜３Ｎｌ／（分・トン）としてＡｌを添加し
て脱酸する脱酸期を設けることを特徴とするステンレス
鋼溶製方法。1. A large diameter straight barrel immersion tube type vacuum degassing device capable of supplying a stirring gas into molten steel and an oxygen gas from an upper blowing lance is used to supply oxygen from an upper blowing lance. After the decarburization period of carrying out the decarburization by supplying the gas, the degree of vacuum is set to 200 to 300 Torr, the supply amount of the stirring gas is set to 4 to 10 Nl / (min · ton), and the slag generated in the decarburization period is set. A deoxidation period is provided in which a discharge period for discharging the liquid to the outside of the immersion pipe is provided, and subsequently, a vacuum degree is 50 to 150 Torr and a stirring gas supply amount is 0.5 to 3 Nl / (min · ton) to deoxidize by adding Al. A method for melting stainless steel, characterized in that it is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9883296A JPH09287016A (en) | 1996-04-19 | 1996-04-19 | Stainless steel melting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9883296A JPH09287016A (en) | 1996-04-19 | 1996-04-19 | Stainless steel melting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09287016A true JPH09287016A (en) | 1997-11-04 |
Family
ID=14230262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9883296A Withdrawn JPH09287016A (en) | 1996-04-19 | 1996-04-19 | Stainless steel melting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09287016A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000077264A1 (en) * | 1999-06-16 | 2000-12-21 | Nippon Steel Corporation | Refining method and refining apparatus of molten steel |
| US7497987B2 (en) | 2001-09-20 | 2009-03-03 | Nippon Steel Corporation | Refining method and refining apparatus for chromium-contained molten steel |
| WO2013060101A1 (en) * | 2011-10-25 | 2013-05-02 | 宝山钢铁股份有限公司 | Method for smelting high-aluminum-low-silicon ultrapure ferritic stainless steel |
| CN114854935A (en) * | 2022-05-18 | 2022-08-05 | 宝武集团鄂城钢铁有限公司 | Deoxidation smelting method for slab Q235 steel and slab Q235 steel |
-
1996
- 1996-04-19 JP JP9883296A patent/JPH09287016A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000077264A1 (en) * | 1999-06-16 | 2000-12-21 | Nippon Steel Corporation | Refining method and refining apparatus of molten steel |
| US6432164B1 (en) | 1999-06-16 | 2002-08-13 | Nippon Steel Corporation | Method for refining molten steel and apparatus therefor |
| US7497987B2 (en) | 2001-09-20 | 2009-03-03 | Nippon Steel Corporation | Refining method and refining apparatus for chromium-contained molten steel |
| WO2013060101A1 (en) * | 2011-10-25 | 2013-05-02 | 宝山钢铁股份有限公司 | Method for smelting high-aluminum-low-silicon ultrapure ferritic stainless steel |
| CN114854935A (en) * | 2022-05-18 | 2022-08-05 | 宝武集团鄂城钢铁有限公司 | Deoxidation smelting method for slab Q235 steel and slab Q235 steel |
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