JPH01222014A - Method for dephosphorizing chromium-containing molten iron - Google Patents
Method for dephosphorizing chromium-containing molten ironInfo
- Publication number
- JPH01222014A JPH01222014A JP63046941A JP4694188A JPH01222014A JP H01222014 A JPH01222014 A JP H01222014A JP 63046941 A JP63046941 A JP 63046941A JP 4694188 A JP4694188 A JP 4694188A JP H01222014 A JPH01222014 A JP H01222014A
- Authority
- JP
- Japan
- Prior art keywords
- molten iron
- flux
- dephosphorization
- naf
- baco3
- 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
-
- 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
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- 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］
この発明はステンレス鋼又は高クロム（Ｃｒ）鋼等のク
ロム含有溶鉄の脱燐方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for dephosphorizing chromium-containing molten iron such as stainless steel or high chromium (Cr) steel.
［従来の技術］
ステンレス鋼又は高クロム（Ｃｒ）鋼等の燐（Ｐ）は、
鋼の機械的性質を劣化させ、耐応力割れ性を低下させる
。また、Ｐはオーステナイト系ステンレス鋼の溶接高温
割れ特性並びにフェライト系ステンレス鋼の張り出し成
形性を低下させる。このため、これらの鋼の精錬の際に
、溶鉄を脱燐する必要がある。Ｖ選炭素鋼の脱燐方法と
しては、溶解酸素が高い炭素鋼に、Ｃａ０−ＦｅＯ系、
ＣａＯ−ＣａＦ２−３ ｉ０２−ＦｅＯ系、ＣａＯ−Ｎ
ａ２０−３ ｉ Ｏ□−ＦｅＯ系、又はＮａ２ Ｃ０ｇ
系等のフラックスを添加する方法が公知である。しかし
、これらのフラックスをＣｒを含有する溶鉄に添加する
と、Ｃｒの酸化反応が優先的に進行し、脱燐反応はほと
んど進行しない、このため、この脱燐方法は、Ｃｒ含有
溶鉄に適用することができない。一方、Ｃｒを含有する
溶鉄を脱燐することができる方法として、ＣａＯ−Ｃａ
Ｆ２系、ＣａＣ２−ＣａＦ２系又はＣａＣ２単独フラッ
クスを使用する還元膜、燐方法が公知である。この方法
において溶銑中のＰを下記（１）式にて示す反応により
、Ｐ３−としてスラグ中に移行させることによって溶鉄
を脱燐する。[Prior art] Phosphorus (P) in stainless steel or high chromium (Cr) steel, etc.
Degrades the mechanical properties of steel and reduces stress cracking resistance. Furthermore, P deteriorates the weld hot cracking properties of austenitic stainless steel and the stretch formability of ferritic stainless steel. Therefore, when refining these steels, it is necessary to dephosphorize the molten iron. As a dephosphorization method for V-selected carbon steel, carbon steel with high dissolved oxygen, Ca0-FeO system,
CaO-CaF2-3 i02-FeO system, CaO-N
a20-3 i O□-FeO system, or Na2 C0g
A method of adding a flux such as a system is known. However, when these fluxes are added to molten iron containing Cr, the oxidation reaction of Cr proceeds preferentially, and the dephosphorization reaction hardly progresses. Therefore, this dephosphorization method cannot be applied to molten iron containing Cr. I can't. On the other hand, as a method that can dephosphorize molten iron containing Cr, CaO-Ca
Reducing membrane and phosphorus methods using F2-based, CaC2-CaF2-based or CaC2-only fluxes are known. In this method, molten iron is dephosphorized by transferring P in the hot metal into the slag as P3- by the reaction shown by the following formula (1).
３Ｃａ＋２Ｐ →（Ｃａ３Ｐ２） ・−（ｉ）し
かし、この還元脱燐方法においては、非酸化性雰囲気で
脱燐する必要があり、又、脱燐処理後のスラグを高温で
酸化処理する必要がある。これは脱燐処理後のスラグを
放置すると、下記（２）式にて示す反応により大気中の
Ｈ２Ｏと反応して有毒なフォスフイン（ＰＨ３）ガスが
発生するからである。3Ca+2P → (Ca3P2) - (i) However, in this reductive dephosphorization method, it is necessary to dephosphorize in a non-oxidizing atmosphere, and it is also necessary to oxidize the slag after the dephosphorization treatment at a high temperature. This is because if the slag after the dephosphorization treatment is left alone, it will react with H2O in the atmosphere through the reaction shown in equation (2) below and generate toxic phosphine (PH3) gas.
（Ｃａ３ Ｐ２ ） ＋ ３８２０
−＝ ３ （Ｃａ Ｏ） ＋ ２ Ｐ Ｈｓ −（
２）このような事情から、還元脱燐法においては、大量
の溶鉄を迅速に脱燐処理することは困難であり、実用性
が低い。一方、酸化脱燐方法においては、大気圧下で脱
燐処理することができ、又、脱燐により生成したスラグ
の酸化処理が不要である。この酸化脱燐方法において、
Ｃｒ含有溶鉄を脱燐することができる脱燐スラグとして
は、Ｃａ０−ＦｅＣｊ１２系、Ｃａ０−Ｃ，ａＣＪ２系
、Ｌｉ２ＣＯ３系、もしくはＬｉ２ＣＯ３を含有するＣ
ａＯ−ＣａＦ２−ＦｅＯ系フラックス、又はＢａ０−Ｂ
ａＣｊ１２−Ｃｒ２０３系もしくはＮａ４５ｉｎ４−Ｎ
ａＦ系フラックスがある。(Ca3 P2 ) + 3820 −= 3 (Ca O) + 2 PHs −(
2) Due to these circumstances, in the reductive dephosphorization method, it is difficult to rapidly dephosphorize a large amount of molten iron, and the practicality thereof is low. On the other hand, in the oxidative dephosphorization method, dephosphorization can be performed under atmospheric pressure, and there is no need to oxidize the slag produced by dephosphorization. In this oxidative dephosphorization method,
Dephosphorization slags that can dephosphorize Cr-containing molten iron include Ca0-FeCj12-based, Ca0-C, aCJ2-based, Li2CO3-based, or C containing Li2CO3.
aO-CaF2-FeO flux, or Ba0-B
aCj12-Cr203 series or Na45in4-N
There is an aF-based flux.
［発明が解決しようとする課題］
しかしながら、この酸化脱燐方法においては前者の脱燐
フラックスを使用すると、溶鉄中の炭素濃度［Ｃ％コが
５％以下と低くなり、脱燐反応が進行しないという欠点
があった。又、後者のフラックスを使用したときには、
これらのフラックスが極めて高価であるため、脱燐処理
コストが上昇するという問題があった。[Problems to be Solved by the Invention] However, in this oxidative dephosphorization method, when the former dephosphorization flux is used, the carbon concentration [C%] in the molten iron becomes as low as 5% or less, and the dephosphorization reaction does not proceed. There was a drawback. Also, when using the latter flux,
Since these fluxes are extremely expensive, there is a problem in that the cost of dephosphorization treatment increases.
この発明はかかる事情に鑑みてなされたものであって、
ステンレス鋼又は高クロム（Ｃｒ）鋼等のクロム含有す
る溶鉄をその炭素濃度に拘らず、Ｃｒを酸化損失させる
ことなく、高効率かつ低コスト含有溶鉄の脱燐方法を提
供することを目的とする。This invention was made in view of such circumstances, and
The purpose of the present invention is to provide a highly efficient and low-cost method for dephosphorizing chromium-containing molten iron such as stainless steel or high chromium (Cr) steel, regardless of its carbon concentration, without causing oxidation loss of Cr. .
［課題を解決するための手段］
この発明に係わるクロム含有溶鉄の脱燐方法は、ＣａＯ
−ＢａＣＯ３−ＮａＦ系フラックスをクロムを含有する
溶鉄に添加して溶鉄中の燐を除去するクロム含有溶鉄の
脱燐方法において、前記フラックスは、ＢａＣＯ３を１
０〜９０重量％、ＮａＦを最大４０重量％、ＣａＯとＢ
ａＣＯ３の総量を６０〜１００重量％としたものである
。[Means for Solving the Problems] The method for dephosphorizing chromium-containing molten iron according to the present invention includes
-BaCO3-NaF-based flux is added to chromium-containing molten iron to remove phosphorus from the molten iron.
0-90% by weight, up to 40% by weight of NaF, CaO and B
The total amount of aCO3 is 60 to 100% by weight.
［作用］
本願発明者等は酸化脱燐の利点を生かしつつ、炭素濃度
が低い溶鉄に対してもＣｒを酸化させることなく高効率
で脱燐することができるフラックスを開発すべく種々実
験研究を重ねた結果、ＣａＯとＢａＣＯ３とＣａＦ２と
を混合させたフラックスが高脱燐効果を有していること
を見出した。しかしながらこのフラックスは特に溶鉄中
低炭素濃度域では脱燐能が充分高いとは言えず、更に高
い脱燐能を持つフラックスを開発する必要があった０本
願発明者等はフラックス中のカチオンが２種になったこ
とによって脱燐能に対して複合効果を生ずることに着目
し、ＣａＦ２の代替としてＮａＦを使用することによっ
て高い脱燐能を得ることを見出した。[Function] The inventors of the present application have carried out various experimental studies in order to develop a flux that can dephosphorize molten iron with a low carbon concentration with high efficiency without oxidizing Cr while taking advantage of the advantages of oxidative dephosphorization. As a result of repeated studies, it was found that a flux made by mixing CaO, BaCO3, and CaF2 had a high dephosphorizing effect. However, this flux cannot be said to have a sufficiently high dephosphorizing ability, especially in the low carbon concentration region of molten iron, and it was necessary to develop a flux with even higher dephosphorizing ability. They focused on the fact that the formation of seeds produces a complex effect on the dephosphorizing ability, and found that high dephosphorizing ability can be obtained by using NaF as a substitute for CaF2.
しかも、このＣａＯ−ＢａＣＯ３−ＮａＦ系フラックス
は低コストであり、実用性が高い、この発明は、このよ
うな知見に基づいてなされたものである。なお、このフ
ラックスの添加により脱硫反応も生じ、溶鉄中の硫黄濃
度［Ｓ％］も低下する。Furthermore, this CaO-BaCO3-NaF flux is low in cost and highly practical.The present invention was made based on this knowledge. Note that the addition of this flux also causes a desulfurization reaction, and the sulfur concentration [S%] in the molten iron also decreases.
［実施例］ 以下、この発明について詳細に説明する。[Example] This invention will be explained in detail below.
この発明においては、ＢａＣＯ３が１０〜９０重量％、
ＮａＦが最大４０重量％、ＣａＯとＢａＣＯ３の総量が
６０〜１００重量％であるＣａＯ−ＢａＣＯ３−ＮａＦ
系フラックスを使用する。第１図は横軸にＮａＦの配合
比（重量％）をとり、縦軸に脱燐率をとって種々のＢａ
ＣＯ３及びＮａＦ配合比（重量％）について、ＣａＯ−
ＢａＣＯ３−ＮａＦ系フラックスの脱燐率を示すグラフ
図である。なお、ＢａＣＯ３の配合比が１０％未満及び
９０％超の場合には、このフラックスによる溶鉄の脱燐
率が著しく低下する。このため、ＢａＣＯ３の配合比が
１０〜９０％とした。In this invention, BaCO3 is 10 to 90% by weight,
CaO-BaCO3-NaF with up to 40 wt% NaF and 60-100 wt% total amount of CaO and BaCO3
Use a system flux. Figure 1 shows the blending ratio (wt%) of NaF on the horizontal axis and the dephosphorization rate on the vertical axis.
Regarding CO3 and NaF blending ratio (wt%), CaO-
FIG. 3 is a graph showing the dephosphorization rate of BaCO3-NaF-based flux. In addition, when the blending ratio of BaCO3 is less than 10% or more than 90%, the dephosphorization rate of molten iron by this flux is significantly reduced. For this reason, the blending ratio of BaCO3 was set to 10 to 90%.
なお、グラフ中の数値はＢａＣ０１の配合値を示す。脱
燐処理前の溶鉄組成は下記の第１表に示す通りである。Note that the numerical values in the graph indicate the blending value of BaC01. The composition of molten iron before dephosphorization treatment is as shown in Table 1 below.
この第１表において、単位は重量％であり、残部は鉄（
Ｆｅ）及び不可避不純物である。脱燐率は、この１６％
Ｃｒ鋼を高周波溶解炉で５Ｋｇ溶解し、この溶鉄にフラ
ックスを溶鉄ＩＫｇ当たり１１１ｇ投入することにより
求めた。第１図から明らかなようにＮａＦの配合比が４
０％以下の場合は脱燐率が７０％以上と高いが、このＮ
ａＦ配合比が４０％を超えると脱燐率が低下する。In this Table 1, the unit is weight%, and the remainder is iron (
Fe) and unavoidable impurities. The dephosphorization rate is 16%
It was determined by melting 5 kg of Cr steel in a high-frequency melting furnace and adding 111 g of flux per I kg of molten iron to the molten iron. As is clear from Figure 1, the blending ratio of NaF is 4.
If the N
When the aF blending ratio exceeds 40%, the dephosphorization rate decreases.
このため、ＮａＦの配合比は最大４０％であり、ＣａＯ
とＢ ａ ＣＯｘの総量は、６０〜１００重量％である
。For this reason, the blending ratio of NaF is at most 40%, and CaO
The total amount of B a COx and B a COx is 60-100% by weight.
以下、この発明の実施例について、具体的に説明する。Examples of the present invention will be specifically described below.
（実施例１）
この実施例においては、下記の第２表の処理前棚に記載
の組成を有するＣｒ含有溶鉄を高周波炉で５Ｋｇ溶解し
、この溶鉄を１４００℃に保持した状態で、ＣａＯが１
８重量％、ＢａＣＯ３が６４重１％、ＮａＦが１８重量
％の組成を有する混合フラックスを溶鉄ＩＫｇ当たり１
１１ｇ投入した。(Example 1) In this example, 5 kg of Cr-containing molten iron having the composition listed on the pre-treatment shelf in Table 2 below was melted in a high frequency furnace, and while this molten iron was maintained at 1400°C, CaO was melted. 1
A mixed flux having a composition of 8% by weight, 64% by weight of BaCO3, and 18% by weight of NaF was added per Ikg of molten iron.
11g was added.
（但し、ｔｒは微量を示す）
この結果、第２表の処理後棚に記載の組成を有する溶鉄
が得られた。この場合の脱燐率は９３％であり、脱硫率
は９７％である。又この脱燐処理においては、Ｃｒの損
失はほとんど生じていな 。(However, tr indicates a trace amount.) As a result, molten iron having the composition described in the post-treatment shelf of Table 2 was obtained. In this case, the dephosphorization rate is 93% and the desulfurization rate is 97%. Also, in this dephosphorization treatment, almost no loss of Cr occurred.
い。stomach.
（実施例２）
この実施例においては、下記の第３表の処理前棚に記載
の組成を有するＣｒ含有溶鉄を高周波炉で５Ｋｇ溶解し
、この溶鉄を１４２０℃に保持した状態で、ＣａＯが１
８重量％、Ｂ’ａＣＯ３が６４重量％、ＮａＦが１８重
量％の組成を有する混合フラックスを溶鉄ＩＫｇ当たり
１１１ｇ投入した。この結果、第３表の処理後棚に記載
の組成を有する溶鉄が得られた。この場合の脱燐率は９
３％であり、脱硫率は９７％である。又この脱燐処理に
おいては、Ｃｒの損失はほとんど生じていない。(Example 2) In this example, 5 kg of Cr-containing molten iron having the composition listed on the pre-treatment shelf in Table 3 below was melted in a high frequency furnace, and while this molten iron was held at 1420°C, CaO was melted. 1
A mixed flux having a composition of 8% by weight, 64% by weight of B'aCO3, and 18% by weight of NaF was charged in an amount of 111g per Ikg of molten iron. As a result, molten iron having the composition shown in the post-treatment shelf of Table 3 was obtained. In this case, the dephosphorization rate is 9
3%, and the desulfurization rate is 97%. Further, in this dephosphorization treatment, almost no loss of Cr occurs.
（実施例３）
この実施例においては、下記の第４表の処理前棚に記載
の組成を有するＣｒ含有溶鉄を高周波炉で５Ｋｇ溶解し
、この溶鉄を１４７０℃に保持した状態で、ＣａＯが１
８重量％、ＢａＣＯ３が６４重量％、ＮａＦが１８重量
％の組成を有する混合フラックスを溶鉄ＩＫｇ当たり１
１１ｇ投入した。この結果、第４表の処理後棚に記載の
組成を有する溶鉄が得られた。この場合の脱燐率は７４
％であり、脱硫率は９７％である。又この脱燐処理にお
いては、Ｃｒの損失はほとんど生じていない。(Example 3) In this example, 5 kg of Cr-containing molten iron having the composition listed in the pre-treatment shelf of Table 4 below was melted in a high frequency furnace, and while this molten iron was held at 1470°C, CaO was melted. 1
8% by weight, 64% by weight of BaCO3, and 18% by weight of NaF per Ikg of molten iron.
11g was added. As a result, molten iron having the composition shown in the post-treatment shelf of Table 4 was obtained. In this case, the dephosphorization rate is 74
%, and the desulfurization rate is 97%. Further, in this dephosphorization treatment, almost no loss of Cr occurs.
（実施例４）
この実施例においては、下記の第５表の処理前棚に記載
の組成を有するＣｒ含有溶鉄を高周波炉で５Ｋｇ溶解し
、この溶鉄を１５２０℃に保持した状態で、ＣａＯが１
８重量％、ＢａＣＯ３が６４重量％、ＮａＦが１８重量
％の組成を有する混合フラックスを溶鉄ＩＫｇ当たり１
１１ｇ投入した。この結果、第５表の処理後棚に記載の
組成を有する溶鉄が得られた。この場合の脱燐率は５６
％であり、脱硫率は９４％である。又この脱燐処理にお
いては、Ｃｒの損失はほとんど生じていない。(Example 4) In this example, 5 kg of Cr-containing molten iron having the composition listed in the pre-treatment shelf of Table 5 below was melted in a high frequency furnace, and while this molten iron was maintained at 1520°C, CaO was melted. 1
8% by weight, 64% by weight of BaCO3, and 18% by weight of NaF per Ikg of molten iron.
11g was added. As a result, molten iron having the composition shown in the post-treatment shelf of Table 5 was obtained. In this case, the dephosphorization rate is 56
%, and the desulfurization rate is 94%. Further, in this dephosphorization treatment, almost no loss of Cr occurs.
（但し、ｔｒは微量を示す）
（実施例５）
この実施例においては、下記の第６表の処理前棚に記載
の組成を有するＣｒ含有溶鉄を高周波炉で５Ｋｇ溶解し
、この溶鉄を１５５０℃に保持した状態で、ＣａＯが１
８重量％、Ｂ ａ ＣＯｓが６４重量％、ＮａＦが１８
重量％の組成を有する混合フラックスを溶鉄ＩＫｇ当た
り１１１ｇ投入した。この結果、第６表の処理後棚に記
載の組成を有する溶鉄が得られた。この場合の脱燐率は
５０％であり、脱硫率は９４％である。又この脱燐処理
においては、Ｃｒの損失はほとんど生じていない。(However, tr indicates a trace amount.) (Example 5) In this example, 5 kg of Cr-containing molten iron having the composition listed in the pre-treatment shelf of Table 6 below was melted in a high frequency furnace, and this molten iron was When maintained at ℃, CaO is 1
8% by weight, 64% by weight of B a COs, 18% by weight of NaF.
A mixed flux having a composition of % by weight was charged in an amount of 111 g per Ikg of molten iron. As a result, molten iron having the composition shown in the post-treatment shelf of Table 6 was obtained. In this case, the dephosphorization rate is 50% and the desulfurization rate is 94%. Further, in this dephosphorization treatment, almost no loss of Cr occurs.
（但し、ｔｒは微量を示す）
このように、本願発明にて規定したフラックスによれば
、Ｃｒ含有溶鉄を、Ｃｒを酸化損失させることなく、高
効率で脱燐することができる。第２図は横軸にＣｒ含有
溶鉄中の炭素濃度［Ｃ％］をとり、縦軸に脱燐率をとっ
た、両者の関係を示すグラフ図である。この第２図は、
前記実施例１〜実施例５における脱燐率を溶鉄中の炭素
濃度［Ｃ％］について整理したものであり、添加フラッ
クスの組成及び添加量は各測定値で同一である。第２図
から明らかなように溶鉄中の炭素濃度［Ｃ％コが４％以
下であっても、脱燐率は５０％以上と高く、極めて広い
炭素濃度範囲にわたって高い脱燐率を示している。しか
も、第２表〜第６表かられかるように、Ｃｒの酸化損失
は極めて少ない。(However, tr indicates a trace amount.) As described above, according to the flux defined in the present invention, Cr-containing molten iron can be dephosphorized with high efficiency without causing oxidation loss of Cr. FIG. 2 is a graph showing the relationship between the carbon concentration [C%] in Cr-containing molten iron on the horizontal axis and the dephosphorization rate on the vertical axis. This second figure is
The dephosphorization rates in Examples 1 to 5 are summarized with respect to the carbon concentration [C%] in the molten iron, and the composition and amount of added flux are the same for each measurement value. As is clear from Figure 2, even if the carbon concentration [C%] in the molten iron is less than 4%, the dephosphorization rate is as high as 50% or more, indicating a high dephosphorization rate over an extremely wide range of carbon concentrations. . Moreover, as can be seen from Tables 2 to 6, the oxidation loss of Cr is extremely small.
［発明の効果］
この発明によれば、酸化脱燐方法の利点を維持しつつ、
溶鉄中の炭素濃度［Ｃ％］が４％以下の低炭素鋼を含む
広範囲の炭素濃度にわたり、Ｃｒを実質的に酸化損失さ
せることなく、高効率で脱燐することができる。[Effect of the invention] According to this invention, while maintaining the advantages of the oxidative dephosphorization method,
Dephosphorization can be performed with high efficiency without substantially oxidizing loss of Cr over a wide range of carbon concentrations including low carbon steel where the carbon concentration [C%] in molten iron is 4% or less.
第１図はＮａＦ配合比と脱燐率との関係を示すグラフ図
、第２図はＣｒ含有溶鉄中の炭素濃度［Ｃ％コと脱燐率
の関係を示すグラフ図である。FIG. 1 is a graph showing the relationship between the NaF blending ratio and the dephosphorization rate, and FIG. 2 is a graph showing the relationship between the carbon concentration [C%] in Cr-containing molten iron and the dephosphorization rate.
Claims (1)
含有する溶鉄に添加して溶鉄中の燐を除去するクロム含
有溶鉄の脱燐方法において、前記フラックスはＢａＣＯ
＿３を１０〜９０重量％、ＮａＦを最大４０重量％、Ｃ
ａＯとＢａＣＯ＿３の総量を６０〜１００重量％とした
ことを特徴とするクロム含有溶鉄の脱燐方法。In a method for dephosphorizing chromium-containing molten iron by adding CaO-BaCO_3-NaF-based flux to chromium-containing molten iron to remove phosphorus from the molten iron, the flux is BaCO
_3 10-90% by weight, NaF up to 40% by weight, C
A method for dephosphorizing chromium-containing molten iron, characterized in that the total amount of aO and BaCO_3 is 60 to 100% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63046941A JPH0649895B2 (en) | 1988-02-29 | 1988-02-29 | Method for dephosphorizing molten iron containing chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63046941A JPH0649895B2 (en) | 1988-02-29 | 1988-02-29 | Method for dephosphorizing molten iron containing chromium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01222014A true JPH01222014A (en) | 1989-09-05 |
| JPH0649895B2 JPH0649895B2 (en) | 1994-06-29 |
Family
ID=12761339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63046941A Expired - Lifetime JPH0649895B2 (en) | 1988-02-29 | 1988-02-29 | Method for dephosphorizing molten iron containing chromium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0649895B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101036317B1 (en) * | 2008-12-19 | 2011-05-23 | 주식회사 포스코 | Delineating agent for ferro-manganese, Recycling method of delineating byproducts of ferro-manganese, Method of recovering delineating by-products of ferro-manganese and Delineating agent for steelmaking |
| JP2015537180A (en) * | 2012-10-10 | 2015-12-24 | ポスコ | Impeller and method for treating sardine hot water using the same |
| WO2018110914A3 (en) * | 2016-12-12 | 2018-08-09 | 주식회사 포스코 | Dephosphorizing flux and method for preparing same |
| US11225695B2 (en) | 2016-12-12 | 2022-01-18 | Posco | Dephosphorizing flux and method for preparing same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011236743A (en) | 2010-04-30 | 2011-11-24 | Hitachi Koki Co Ltd | Engine and engine operating machine including the same |
| JP2013170471A (en) | 2012-02-17 | 2013-09-02 | Hitachi Koki Co Ltd | Engine working machine |
-
1988
- 1988-02-29 JP JP63046941A patent/JPH0649895B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101036317B1 (en) * | 2008-12-19 | 2011-05-23 | 주식회사 포스코 | Delineating agent for ferro-manganese, Recycling method of delineating byproducts of ferro-manganese, Method of recovering delineating by-products of ferro-manganese and Delineating agent for steelmaking |
| JP2015537180A (en) * | 2012-10-10 | 2015-12-24 | ポスコ | Impeller and method for treating sardine hot water using the same |
| US9683271B2 (en) | 2012-10-10 | 2017-06-20 | Posco | Impeller and method of melt-pool processing method using the same |
| WO2018110914A3 (en) * | 2016-12-12 | 2018-08-09 | 주식회사 포스코 | Dephosphorizing flux and method for preparing same |
| US11225695B2 (en) | 2016-12-12 | 2022-01-18 | Posco | Dephosphorizing flux and method for preparing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0649895B2 (en) | 1994-06-29 |
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