JP2615213B2 - Method for melting 12Cr cast steel - Google Patents
Method for melting 12Cr cast steelInfo
- Publication number
- JP2615213B2 JP2615213B2 JP1191548A JP19154889A JP2615213B2 JP 2615213 B2 JP2615213 B2 JP 2615213B2 JP 1191548 A JP1191548 A JP 1191548A JP 19154889 A JP19154889 A JP 19154889A JP 2615213 B2 JP2615213 B2 JP 2615213B2
- Authority
- JP
- Japan
- Prior art keywords
- molten metal
- steel slag
- arc furnace
- gas
- slag
- 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 - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は12Cr鋳鋼の溶解方法に関する。The present invention relates to a method for melting 12Cr cast steel.
従来の12Cr鋳鋼の溶解方法を第３図によつて説明す
る。A conventional method for melting 12Cr cast steel will be described with reference to FIG.
第３図（ａ）に示すように、溶解用の地金を塩基性ア
ーク炉24内に装入後溶解する。溶解後、ランスパイプ25
を通して溶湯26中に酸素を吹き込むことによって、溶湯
26中からC,Pを除去した後、石灰を該アーク炉24に投入
する。As shown in FIG. 3 (a), the melting metal is charged into the basic arc furnace 24 and then melted. After melting, lance pipe 25
By blowing oxygen into the melt 26 through the melt
After removing C and P from 26, lime is charged into the arc furnace 24.
次に、第３図（ｂ）に示すように、石灰を投入された
溶湯27を取鍋28に移して、さらに第３図（ｃ）に示すよ
うに取鍋28より取鍋精錬炉29に移すことにより鋼滓30を
除去する。この鋼滓30の除去は取鍋28の栓28′を抜くこ
とにより、取鍋28中の溶湯27を取鍋精錬炉29に流出さ
せ、取鍋28の上部に存在する鋼滓30が取鍋28中に残つて
いる段階で栓28′を閉めることにより、最終的に石灰に
浸透したP,Sを取鍋28中に残して鋼滓30を除去すること
が行われる。Next, as shown in FIG. 3 (b), the molten metal 27 charged with lime is transferred to a ladle 28, and further from the ladle 28 to the ladle refining furnace 29 as shown in FIG. 3 (c). The steel slag 30 is removed by transferring. The removal of the steel slag 30 is performed by removing the plug 28 ′ of the ladle 28 so that the molten metal 27 in the ladle 28 flows out to the ladle refining furnace 29, and the steel slag 30 existing above the ladle 28 is removed from the ladle 28. By closing the plug 28 ′ at the stage where the lime remains, the P and S that have finally penetrated the lime are left in the ladle 28 to remove the steel slag 30.
次に第３図（ｄ）に示すように、取鍋精錬炉29内で溶
湯31は成分調整され、また、Arガスの吹き込み32と真空
引き33を行う真空脱ガス装置34によつて溶湯31中から不
純物ガス及びＳを除去する。Next, as shown in FIG. 3D, the composition of the molten metal 31 is adjusted in a ladle refining furnace 29, and the molten metal 31 is blown by Ar gas 32 and vacuum degassed by a vacuum degassing device 34. The impurity gas and S are removed from the inside.
上述したように、従来の溶解方法では取鍋精錬炉及び
真空脱ガス装置などが必要で、これらの設備がなければ
12Cr鋳鋼は溶解できない。また、これらの設備を導入す
るためには多大な設備投資が必要である。As described above, the conventional melting method requires a ladle refining furnace and a vacuum degassing device, etc.
12Cr cast steel cannot be melted. In addition, a large capital investment is required to introduce these facilities.
本発明は上記技術水準に鑑み、取鍋精錬炉及び真空脱
ガス装置を使用せずに12Cr鋳鋼を溶解しうる方法を提供
しようとするものである。The present invention has been made in view of the above-mentioned state of the art, and aims to provide a method capable of melting 12Cr cast steel without using a ladle refining furnace and a vacuum degassing apparatus.
本発明は塩基性アーク炉に、溶落時の成分がＰ＜0.03
％,S＜0.02％,C＝0.5％,Cr＝9.0％，その他の成分が目
標成分以下となるように地金を配合する第１工程、これ
らの地金が完全に溶け落ちた直後に該塩基アーク炉より
鋼滓を排出して初期P,S濃度を低下させた後、残留溶湯
中に造滓材として生石灰及びホタル石を投入する第２工
程、次の酸化期に酸素及びアルゴンの混合ガスを溶湯中
に吹き込み、P,C,不純物ガスを除去する第３工程、生石
灰・ホタル石及びFe−Siを溶湯中に投入して、前記第３
工程において酸化されて鋼滓中に移動したCrを溶湯中に
回収して鋼滓を排出する第４工程及び生石灰及びホタル
石を投入して溶湯の酸化を防ぐと共にP,Sを溶湯から除
去して鋼滓中に移動させ、目標成分になるように適当な
合金鉄を投入した後に、さらにＳを溶湯から除去して鋼
滓中に移動させるためにCa−Siをアルゴンガスと共に溶
湯中に直接吹き込む第５工程よりなることを特徴とする
12Cr鋳鉄の溶解方法である。In the present invention, the basic arc furnace has a component at the time of erosion of P <0.03.
%, S <0.02%, C = 0.5%, Cr = 9.0%, the first step of compounding the metal so that the other components are below the target components. After discharging the steel slag from the basic arc furnace to lower the initial P and S concentrations, the second step of charging quicklime and fluorite as slag-making material into the residual molten metal, mixing oxygen and argon in the next oxidation stage A third step of blowing gas into the molten metal to remove P, C, and impurity gases, and introducing quicklime, fluorite and Fe-Si into the molten metal to form the third step
The fourth step of recovering Cr oxidized in the process and moving into the steel slag in the molten metal and discharging the steel slag and charging quicklime and fluorite to prevent oxidation of the molten metal and removing P and S from the molten metal After moving into the steel slag and adding an appropriate ferromagnetic iron so as to become the target component, Ca is removed directly from the molten metal together with the argon gas into the molten metal in order to remove S further from the molten metal and move it into the steel slag. It is characterized by comprising a fifth step of blowing
This is a method for melting 12Cr cast iron.
初期装入地金が完全に溶け落ちた直後に鋼滓を排出さ
せることにより、溶湯の初期P,S濃度を低下させる。酸
素及びアルゴンの混合ガスを吹き込むことにより、Ｃ及
びＰを除去し、不純物ガスを除去する。アルゴン及びCa
−Siを吹き込むことで、Ｓ≦0.010％とし、さらに不純
物ガスを除去する。By discharging the steel slag immediately after the initial charging metal has completely melted down, the initial P and S concentrations of the molten metal are reduced. By blowing a mixed gas of oxygen and argon, C and P are removed, and an impurity gas is removed. Argon and Ca
By blowing Si, S ≦ 0.010% is set, and the impurity gas is further removed.
＜地金配合＞（第１工程） 塩基性アーク炉に、溶落時の成分がＰ＜0.03％,S＜0.
02％,C＝0.5％,Cr＝9.0％，その他の成分が目標成分以
下となるように地金を配合してＣ成分以外の成分が目標
成分を超えてないようにする。<Incorporation of metal> (First step) In the basic arc furnace, the components at the time of meltdown are P <0.03%, S <0.
Metals are blended so that 02%, C = 0.5%, Cr = 9.0% and other components are below the target components so that components other than the C component do not exceed the target components.
＜完全溶落後の鋼滓の排出及び造滓材の投入＞（第２工
程） 塩基性アーク炉に装入した地金が完全に溶落したのを
確認後、直ちに塩基性アーク炉内の鋼滓の90％以上を排
出する。Ｐ及びＳは低温では溶湯ではなく鋼滓の中に含
まれており、この操作によつてＰ及びＳがかなり除去さ
れる。鋼滓を排出した後に溶湯重量トン当たり10〜30kg
の生石灰と溶湯重量トン当たり２〜8kgのホタル石を鋼
滓の流動性を向上させるために造滓材として投入する。<Discharge of steel slag after complete erosion and charging of slag-making material> (Second step) After confirming that the metal charged in the basic arc furnace has completely eroded, the steel in the basic arc furnace is immediately Discharge more than 90% of the slag. P and S are contained not in the molten metal but in the steel slag at low temperatures, and this operation removes P and S considerably. 10-30kg per ton of molten metal after discharging steel slag
Lime and 2 to 8 kg of fluorite per weight ton of molten metal are introduced as slag-making materials in order to improve the fluidity of the steel slag.
＜酸素及びアルゴンの混合ガス吹き込みによるＣ・Ｐ・
不純物ガスの除去＞（第３工程） これについては、第１図を参照しながら説明する。第
１図において、Arガスボンベ１に圧力計２及び流量計３
を接続して、二又パイプ４の一端５に接続する。また、
O2ガスボンベ６に圧力計７及び流量計８を接続して、二
又パイプ４の一端９に接続する。二又パイプ４の残りの
一端10をジルコン11で耐熱コーティングしたランスパイ
プ12に接続する。<C ・ P ・ by blowing mixed gas of oxygen and argon
Removal of Impurity Gas> (Third Step) This will be described with reference to FIG. In FIG. 1, a pressure gauge 2 and a flow meter 3 are attached to an Ar gas cylinder 1.
And connected to one end 5 of the bifurcated pipe 4. Also,
A pressure gauge 7 and a flow meter 8 are connected to the O 2 gas cylinder 6 and connected to one end 9 of the bifurcated pipe 4. The other end 10 of the bifurcated pipe 4 is connected to a lance pipe 12 heat-coated with zircon 11.
塩基性アーク炉13内の溶湯14の温度が1600℃以上にな
つたのを確認して、ジルコン11で耐熱コーテイングした
ランスパイプ12の一部に15を塩基性アーク炉13内の溶湯
14に入れ、Arガスボンベ１を開いてArガスを塩基性アー
ク炉13内の溶湯14に送る。Arガスの圧力が６〜7kg/c
m2、流量が２〜4Nm3/minになるように圧力計２及び流量
計３で確認し、同時にO2ガスボンベ６を開いてO2ガスを
塩基性アーク炉13内の溶湯14に送る。O2ガスの圧力が６
〜7kg/cm2、流量が４〜6Nm3/minになるように圧力計６
及び流量計７で確認する。ずれた場合は上記圧力及び流
量が適切になるよう調整する。After confirming that the temperature of the molten metal 14 in the basic arc furnace 13 has reached 1600 ° C. or higher, 15 is added to a part of the lance pipe 12 heat-coated with zircon 11 and the molten metal 14 in the basic arc furnace 13
14, the Ar gas cylinder 1 is opened, and Ar gas is sent to the molten metal 14 in the basic arc furnace 13. Ar gas pressure is 6-7kg / c
The O 2 gas cylinder 6 is opened and the O 2 gas is sent to the molten metal 14 in the basic arc furnace 13 by checking the m 2 and the flow rate at 2 to 4 Nm 3 / min with the pressure gauge 2 and the flow meter 3. O 2 gas pressure is 6
~7kg / cm 2, the pressure so that the flow rate is 4 to 6 nm 3 / min Total 6
And the flow meter 7. In the case of deviation, the pressure and the flow rate are adjusted to be appropriate.
Ｃ量が0.07％以下になつたのを成分分析によつて確認
して、Arガス及びO2ガスを塩基性アーク炉13内の溶湯14
に吹き込むことを終了する。この操作の際、塩基性アー
ク炉13内の溶湯14の温度が2000℃を越える時はAr流量を
上げるようにすべきである。The C content was confirmed to be 0.07% or less by component analysis, and the Ar gas and the O 2 gas were removed from the molten metal 14 in the basic arc furnace 13.
To end the blow. In this operation, when the temperature of the molten metal 14 in the basic arc furnace 13 exceeds 2000 ° C., the Ar flow rate should be increased.
上記の操作はO2ガスを塩基性アーク炉13内の溶湯14中
に吹き込むことによつて、 2C＋O2→2CO 4P＋5O2→2P2O5 の反応を生起させ、塩基性アーク炉13内の溶湯14から、
ＣをCOガスとし、またＰをP2O5として除去しようとする
ものである。The above operation causes the reaction of 2C + O 2 → 2CO 4P + 5O 2 → 2P 2 O 5 to occur by blowing O 2 gas into the molten metal 14 in the basic arc furnace 13, and the molten metal in the basic arc furnace 13 From 14,
It is intended to remove C as CO gas and P as P 2 O 5 .
また、この操作時、同時にArガスを吹き込むのは、塩
基性アーク炉13内の溶湯14から不純物ガスを除去し、同
時に急激な溶湯14の温度上昇を防止するためである。The reason why the Ar gas is blown simultaneously during this operation is to remove impurity gas from the molten metal 14 in the basic arc furnace 13 and at the same time prevent a sharp rise in the temperature of the molten metal 14.
＜Fe−Si及び造滓材投入によるCrの回収＞（第４工程） 溶湯重量トン当たり20kgのFe−Siと、造滓材として溶
湯重量トン当たり10〜30kgの生石灰と溶湯重量トン当た
り２〜8kgのホタル石を鋼滓の流動性を向上させるため
に同時に投入する。<Recovery of Cr by Injection of Fe-Si and Slag-making Material> (Fourth Step) 20 kg of Fe-Si per ton of molten metal, 10-30 kg of quicklime as a slag-making material and 2 to 2 kg of molten lime per ton of molten metal 8 kg of fluorite is simultaneously injected to improve the flowability of the steel slag.
この操作においてFe−Siを投入することによつて、2C
r2O3（鋼滓中）＋3Si→4Cr（溶湯）＋3SiO3（鋼滓中）
の反応か生じ、前工程の酸化期に酸化されてCr2O3にな
つたCrがSiによつて還元されて高価なCrが溶湯中に回収
される。By introducing Fe-Si in this operation, 2C
r 2 O 3 (in steel slag) + 3Si → 4Cr (melt) + 3SiO 3 (in steel slag)
The Cr that has been oxidized to Cr 2 O 3 during the oxidation stage of the previous step is reduced by Si and expensive Cr is recovered in the molten metal.
生石灰の主成分はCaOであり、生石灰を投入すること
によつて鋼滓の塩基度が上昇し、Crの回収が促進され
る。The main component of quicklime is CaO, and the addition of quicklime increases the basicity of the steel slag and promotes the recovery of Cr.
Fe−Si及び造滓材の投入から20〜40分経過後、鋼滓は
排出される。鋼滓はSiO2,FeOなどの金属酸化物及びP,S
を多量に含んだ生石灰と流動剤としてのホタル石との混
合物である。なお、この工程で投入されるFe−SiのSi分
の一部は前述したようにCrの回収に使用されてSiO2とな
つて鋼滓の一部となるが、その他のSi分は溶湯成分のSi
となつて溶湯中に残る。After 20 to 40 minutes have passed since the introduction of Fe-Si and the slag material, the steel slag is discharged. Steel slag is composed of metal oxides such as SiO 2 and FeO and P, S
Is a mixture of quicklime containing a large amount of fluorite and fluorite as a fluidizing agent. Although some of the Si content of the Fe-Si to be introduced in this step being used in the recovery of Cr as described above becomes a part of SiO 2 and Do connexion steel slags, other Si content is melt component Si
And remains in the molten metal.
＜Ｓの除去および成分調整＞（第５工程） 造滓材として溶湯重量トン当たり10〜30kgの生石灰と
溶重量トン当たり２〜8kgのホタル石を鋼滓の流動性を
向上させるために再度投入する。<Removal of S and component adjustment> (Fifth step) 10-30 kg of quicklime and 2-8 kg of fluorite per 2 tons of molten slag are added again as slag making materials to improve the fluidity of the steel slag. I do.
溶湯成分の分析結果をみて、目標成分になるように適
当な合金鉄を直接塩基性アーク炉13内の溶湯14中に投入
する。Based on the analysis result of the molten metal component, an appropriate ferromagnetic iron is directly injected into the molten metal 14 in the basic arc furnace 13 so as to become a target component.
この工程の操作を第２図を参照しながら説明する。第
２図において、Arガスボンベ16に圧力計17及び流量計18
を接続して粉体供給装置19に接続し、ランスパイプ20を
粉体供給装置19に接続する。The operation of this step will be described with reference to FIG. In FIG. 2, a pressure gauge 17 and a flow meter 18 are attached to an Ar gas cylinder 16.
Are connected to the powder supply device 19, and the lance pipe 20 is connected to the powder supply device 19.
粉体供給装置19にCa−Siを溶湯重量トン当たり0.5〜2
kg入れ、ランスパイプ20の一部21を塩基性アーク炉13内
の溶湯23に挿入してArガスボンベ16を開くとArガス及び
Ca−Siが塩基性アーク炉13内の溶湯23中に吹き込まれ
る。Arガスの圧力が６〜7kg/cm2,流量が２〜4Nm3/minに
なるように圧力計17及び流量計18で確認する。0.5 to 2 per weight ton of Ca-Si
kg, a part 21 of the lance pipe 20 is inserted into the molten metal 23 in the basic arc furnace 13 and the Ar gas cylinder 16 is opened, so that Ar gas and
Ca-Si is blown into the molten metal 23 in the basic arc furnace 13. Check the pressure of the Ar gas with a pressure gauge 17 and a flow meter 18 so that the pressure is 6 to 7 kg / cm 2 and the flow rate is 2 to 4 Nm 3 / min.
Ca−Siを塩基性アーク炉13内の溶湯23に直接吹き込む
ことによつて 2Ca＋2O（溶湯中）→2CaO 2CaO＋Ｓ（溶湯中）→2Ca＋SO2 の反応が起こり、塩基性アーク炉13内の溶湯23から、Ｓ
がSO2となつて除去される。溶湯中のＳはCaOのO2と反応
してSO2なつて溶湯中から除去される。同時にArガスを
吹き込むことによつて、塩基性アーク炉13内の溶湯から
不純物ガスが除去される。Arガス吹込みによる不純物ガ
ス排出とは、溶湯中で不純物ガスは高圧の小さな気泡と
して存在するので、アルゴンガスのそれより低圧の大き
な気泡を吹き込むことで、不純物ガスの高圧の小さな気
泡を吸収して溶湯の外に排出することをいう。By directly injecting Ca-Si into the molten metal 23 in the basic arc furnace 13, a reaction of 2Ca + 2O (in the molten metal) → 2CaO 2CaO + S (in the molten metal) → 2Ca + SO 2 occurs, and from the molten metal 23 in the basic arc furnace 13. , S
Is removed as SO 2 . S in the molten metal reacts with O 2 of CaO and is removed from the molten metal as SO 2 . By simultaneously injecting Ar gas, the impurity gas is removed from the molten metal in the basic arc furnace 13. Impurity gas discharge by Ar gas injection means that the impurity gas is present as small bubbles with high pressure in the molten metal.By blowing large bubbles with low pressure than that of argon gas, small bubbles with high pressure of the impurity gas are absorbed. Discharge out of the molten metal.
＜出湯＞ 塩基性アーク炉13内の溶湯23の成分が所望範囲内にあ
ることを確認後に出湯する。所望範囲内でない場合は合
金鉄を直接添加して成分調整する。<Tapping> After confirming that the components of the molten metal 23 in the basic arc furnace 13 are within a desired range, the tapping is performed. If it is not within the desired range, the component is adjusted by directly adding ferromagnetic iron.
初期装入地金が完全に溶け落ちた直後に鋼滓を排出し
造滓材を投入することと、酸化期に塩基性アーク炉内に
ある溶湯に酸素及びアルゴンの混合ガスを直接吹き込む
ことと、還元期に塩基性アーク炉内にある溶湯にアルゴ
ン及びCa−Siを直接吹き込むことにより、溶湯のＣ含有
量を0.02％以下に、溶湯のＰ含有量を0.02％以下に、ま
た溶湯のＳ含有量を0.01％以下とすることが可能とな
り、取鍋精錬炉及び真空脱ガス装置を使用せずに12Cr鋳
鋼を溶解することが可能となつた。Immediately after the initial charging ingot was completely melted down, the steel slag was discharged and slag was charged, and a mixed gas of oxygen and argon was directly blown into the molten metal in the basic arc furnace during the oxidation period. By directly blowing argon and Ca—Si into the molten metal in the basic arc furnace during the reduction period, the C content of the molten metal is reduced to 0.02% or less, the P content of the molten metal is reduced to 0.02% or less, and the S content of the molten metal is reduced to 0.02% or less. The content can be reduced to 0.01% or less, and the 12Cr cast steel can be melted without using a ladle refining furnace and a vacuum degassing device.
第１図は本発明の酸素及びアルゴンの混合ガス吹き込み
工程で使用する装置の概略図、第２図は本発明のアルゴ
ン及びCa−Si吹き込み工程で使用する装置の概略図、第
３図は従来の12Cr鋳鋼製造方法の概略図である。FIG. 1 is a schematic view of an apparatus used in the oxygen and argon mixed gas injection step of the present invention, FIG. 2 is a schematic view of an apparatus used in the argon and Ca—Si injection step of the present invention, and FIG. FIG. 2 is a schematic view of a method for producing a 12Cr cast steel of the present invention.
Claims (1)
03％,S＜0.02％,C＝0.5％,Cr＝9.0％、その他の成分が
目標成分以下となるように地金を配合する第１工程、こ
れらの地金が完全に溶け落ちた直後に該塩基性アーク炉
より鋼滓を排出して初期P,S濃度を低下させた後、残留
溶湯中に造滓材として生石灰及びホタル石を投入する第
２工程、次の酸化期に酸素及びアルゴンの混合ガスを熔
湯中に吹き込み、P,C,不純物ガスを除去する、第３工
程、生石灰・ホタル石及びFe−Siを溶湯中に投入して、
前記第３工程において酸化されて鋼滓中に移動したCrを
溶湯中に回収して鋼滓を排出する第４工程及び生石灰及
びホタル石を投入して溶湯の酸化を防ぐと共に、P,Sを
溶湯から除去して鋼滓中に移動させ、目標成分になるよ
うに適当な合金鉄を投入した後に、さらにＳを溶湯から
除去して鋼滓中に移動させるためにCa−Siをアルゴンガ
スと共に溶湯中に直接吹き込む第５工程よりなることを
特徴とする12Cr鋳鋼の溶解方法。(1) In a basic arc furnace, components at the time of melting are P <0.
03%, S <0.02%, C = 0.5%, Cr = 9.0%, the first step of compounding the metal so that the other components are below the target components, immediately after these metals are completely melted down After discharging the steel slag from the basic arc furnace to reduce the initial P and S concentrations, the second step of charging quicklime and fluorite as slag-making material into the residual molten metal, oxygen and argon in the next oxidation stage The third step, in which P, C and impurity gas are removed, is injected into the molten metal by adding quicklime, fluorite and Fe-Si into the molten metal.
The fourth step of recovering the oxidized Cr in the third step and moving into the steel slag in the molten metal and discharging the steel slag and charging quick lime and fluorite to prevent oxidation of the molten metal and reducing P, S After being removed from the molten metal and moved into the steel slag, and after adding an appropriate ferromagnetic iron so as to be a target component, Ca-Si is removed together with the argon gas to further remove S from the molten metal and move into the steel slag. A method for melting 12Cr cast steel, comprising a fifth step of directly blowing into a molten metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1191548A JP2615213B2 (en) | 1989-07-26 | 1989-07-26 | Method for melting 12Cr cast steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1191548A JP2615213B2 (en) | 1989-07-26 | 1989-07-26 | Method for melting 12Cr cast steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0356612A JPH0356612A (en) | 1991-03-12 |
| JP2615213B2 true JP2615213B2 (en) | 1997-05-28 |
Family
ID=16276508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1191548A Expired - Lifetime JP2615213B2 (en) | 1989-07-26 | 1989-07-26 | Method for melting 12Cr cast steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2615213B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT403293B (en) * | 1995-01-16 | 1997-12-29 | Kct Tech Gmbh | METHOD AND INSTALLATION FOR THE PRODUCTION OF ALLOY STEELS |
-
1989
- 1989-07-26 JP JP1191548A patent/JP2615213B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0356612A (en) | 1991-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102071287B (en) | Method for melting high-temperature-resistance and high-pressure-resistance alloy steel | |
| CN108330245A (en) | A kind of high-purity smelting process of stainless steel | |
| CN109207672B (en) | Slag discharging method in production process of ultra-low phosphorus steel and production method of ultra-low phosphorus steel | |
| JP2013023738A (en) | Method for reusing slag in ladle | |
| JP6421634B2 (en) | Manufacturing method of molten steel | |
| CN113564381A (en) | Synergistic copper smelting method and building material | |
| JP2615213B2 (en) | Method for melting 12Cr cast steel | |
| CN113249549B (en) | Aluminum-manganese-calcium-barium-magnesium-iron alloy for steelmaking and manufacturing method thereof | |
| US3172758A (en) | Oxygen process for producing high | |
| JP3915341B2 (en) | Hot phosphorus dephosphorization method | |
| JP3711835B2 (en) | Sintering agent for hot metal dephosphorization and hot metal dephosphorization method | |
| JPH0987722A (en) | Method for refining molten crude stainless steel | |
| US4544405A (en) | Method of producing steels of great purity and low gas content in steel mills and steel foundries and apparatus therefor | |
| CN108588340A (en) | A kind of method that low-temperature refining prepares low aluminium calcium impurities Antaciron | |
| JPS62227025A (en) | Pretreatment of molten iron | |
| KR100411288B1 (en) | Method for recovering chromium from electric furnace slag | |
| JP2964861B2 (en) | Stainless steel manufacturing method | |
| KR20130068342A (en) | Refining method of phosphorus and sulfur in molten steel | |
| JP2002371313A (en) | Method for smelting molten stainless steel | |
| JP2757707B2 (en) | Hot metal dephosphorization slag treatment method | |
| JPH10265827A (en) | Regenerating/utilizing method of refined slag in chromium-containing steel and regenerating/utilizing method of metallic component contained in the slag | |
| KR101706931B1 (en) | Deoxidizing Agent Manufacturing Method and Apparatus for Deoxidization and Desulfurization of Steelmaking and Cast Steel | |
| JP3414811B2 (en) | Recovery method of residual alloy components in slag after refining when smelting low alloy steel | |
| SU1691399A1 (en) | Method of producing structural chromium steels | |
| RU2280699C2 (en) | Method of steel making in oxygen converter with slag remaining |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080311 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090311 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100311 Year of fee payment: 13 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100311 Year of fee payment: 13 |