JPS6254165B2 - - Google Patents
Info
- Publication number
- JPS6254165B2 JPS6254165B2 JP56201660A JP20166081A JPS6254165B2 JP S6254165 B2 JPS6254165 B2 JP S6254165B2 JP 56201660 A JP56201660 A JP 56201660A JP 20166081 A JP20166081 A JP 20166081A JP S6254165 B2 JPS6254165 B2 JP S6254165B2
- Authority
- JP
- Japan
- Prior art keywords
- dephosphorization
- molten steel
- molten metal
- deoxidation
- phosphorus
- 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
- 238000000034 method Methods 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 238000006477 desulfuration reaction Methods 0.000 claims description 7
- 230000023556 desulfurization Effects 0.000 claims description 7
- 229910000882 Ca alloy Inorganic materials 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- 230000002829 reductive effect Effects 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 239000011651 chromium Substances 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000004907 flux Effects 0.000 description 5
- 238000007670 refining Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
本発明は溶湯の還元脱りん法に係り、特に酸
素、硫黄及びりんを含む溶鋼中のりんを容易にし
かも効率よく還元脱りんする溶湯の脱りん法に関
する。現在は、VOD法やAOD法等の特殊精錬技
術の開発により鋼溶湯の極低炭素化は容易とな
り、それにともない、低窒素化及び低硫黄化の見
通しが得られてきた。しかしながら、鉄鋼材料に
おいて、特殊な用途を除いては最も有害な元素の
一つであるりんの除去方法については、塩基性ス
ラグを使用した酸化精錬で除去する方法以外あま
りなされていなかつた。この酸化精錬では、溶湯
中のＰの一部が酸化され、P2O5となり、これが
酸化鉄と結合してFe2O3・P2O5となり除去され
る。一方、Ｐの大部分はスラグ成分である石灰と
結合して安定な3CaO・P2O5か或は4CaO・P2O5
となり除去する方法である。
しかし、たとえばCrなどのようにFeよりも酸
化されやすい成分を含有する鋼溶湯は上記のよう
な酸化精錬法によつて脱りんすることは困難であ
る上、脆性に対する材質的な問題と製造コストの
低減化のためにもCrの損失がなく容易に直接脱
りんが出来ることが望まれている。そして現在で
はCa系融体を用い、融体中のCaと溶湯中のＰと
の間に3Ca＋2P→Ca3P2の反応を直接生じさせる
次のような還元脱りん法がある。
(1) Ca−CaF2系フラツクスを用いる方法。（中
村外：鉄鋼（1975）S137）
(2) CaC2−CaF2系フラツクスを用いる方法。
（中村外：鉄と鋼：61、４（1975））
上記の方法は公知であるCaの脱りん能を製鋼
温度でも発揮させようとしたものである。すなわ
ち、金属CaやCa合金を直接溶湯中に添加するこ
とが出来れば溶湯中のＰを除去する能力を有して
いることはすでに知られていることであるが、製
鋼温度ではCaの蒸気圧が高くなり、蒸発速度が
大きくなるため、Caのほとんどは蒸発してしま
い、脱りん効果を発揮することが出来ない。そこ
で、上記のようなCa系のフラツクス融体を用い
ることにより、効果を発揮させようとしたもので
ある。
しかしながら(1)のCa−CaF2系のフラツクスを
用いる方法ではフラツクスが反応性に富むため反
応容器として耐火物を用いることが出来ないとい
う現在の工業ベースとしては致命的な欠点があ
る。又(2)の方法を用いた場合は、CaC2をCaとＣ
に効率よく分離させるためふつ化物の最適量を選
定しなければならないが、高温では不安定なため
必要量を得にくい上、耐火物を損傷するという欠
点がある。又、反応容器内に残存するスラグが混
入するためCaC2の反応効率が悪化するという欠
点がある。
本発明の目的は、Caの脱りん作用を効果的に
発揮させることにより、良好な溶湯を得る還元脱
りん法を提供するにある。
本発明の要点は、酸素、硫黄及びりんを含む鋼
溶湯をCa又はCa合金を用いて直接還元脱りんす
る方法において、脱りん前の溶湯中に存在する酸
素及び硫黄が、りんとCaとの反応よりも先にCa
と反応して脱りん効果を阻害することを実験によ
り確認し、Ca又はCa合金による直接脱りんを効
果的に行い得るようにしたものである。具体的に
は、還元脱りん処理の前に溶鋼を脱酸脱硫処理す
ることにある。又、Ca又はCa合金による脱りん
効果を発揮させるために鉄パイプ中にCa又はCa
合金粉末をつめて溶鋼に添加しCaの蒸発を防止
するとともに脱りんの間中、溶鋼中のCa量を
0.004重量％以上に保つことにある。
以下、本発明を18−８ステンレス鋼のCaによ
る直接脱りんの一実施例に基づいて説明する。
The present invention relates to a reductive dephosphorization method for molten metal, and more particularly to a molten metal dephosphorization method for easily and efficiently reductively dephosphorizing phosphorus in molten steel containing oxygen, sulfur, and phosphorus. Currently, with the development of special refining technologies such as the VOD method and the AOD method, it has become easier to reduce the carbon content of molten steel to an extremely low level, and along with this, the prospect of reducing nitrogen and sulfur content has been obtained. However, except for special uses, there have been few methods for removing phosphorus, one of the most harmful elements, other than oxidative refining using basic slag. In this oxidation refining, a part of P in the molten metal is oxidized to become P 2 O 5 , which combines with iron oxide to become Fe 2 O 3.P 2 O 5 and is removed. On the other hand, most of the P is either 3CaO・P 2 O 5 or 4CaO・P 2 O 5 , which is stable by combining with lime, which is a slag component.
This is the method to remove it. However, it is difficult to dephosphorize molten steel containing components that are more easily oxidized than Fe, such as Cr, by the oxidation refining method described above, and there are problems with the material's brittleness and manufacturing costs. In order to reduce the amount of Cr, it is desired that dephosphorization can be performed easily and directly without loss of Cr. Currently, there is the following reductive dephosphorization method that uses a Ca-based melt to directly cause the reaction 3Ca+2P→Ca 3 P 2 between Ca in the melt and P in the molten metal. (1) Method using Ca-CaF 2- based flux. (Nakamura Soto: Tekko (1975) S137) (2) Method using CaC 2 −CaF 2 system flux.
(Nakamura Soto: Tetsu to Hagane: 61, 4 (1975)) The above method is an attempt to bring out the known dephosphorizing ability of Ca even at steel-making temperatures. In other words, it is already known that if metallic Ca or Ca alloy can be directly added to the molten metal, it has the ability to remove P from the molten metal, but at steelmaking temperatures, the vapor pressure of Ca As the evaporation rate increases, most of the Ca evaporates and the dephosphorization effect cannot be exerted. Therefore, an attempt was made to achieve this effect by using a Ca-based flux melt as described above. However, the method (1) using a Ca-CaF 2 -based flux has a fatal drawback on the current industrial basis in that the flux is highly reactive and refractories cannot be used as the reaction vessel. Also, if method (2) is used, CaC 2 is replaced by Ca and C
The optimum amount of fluoride must be selected for efficient separation, but it is unstable at high temperatures, making it difficult to obtain the required amount, and it also has the disadvantage of damaging refractories. Furthermore, there is a drawback that the reaction efficiency of CaC 2 is deteriorated due to the contamination of slag remaining in the reaction vessel. An object of the present invention is to provide a reductive dephosphorization method for obtaining a good molten metal by effectively exerting the dephosphorizing action of Ca. The main point of the present invention is that in a method of directly reducing and dephosphorizing molten steel containing oxygen, sulfur, and phosphorus using Ca or Ca alloy, the oxygen and sulfur present in the molten metal before dephosphorization react with phosphorus and Ca. Ca before
It has been confirmed through experiments that the dephosphorization effect is inhibited by reacting with Ca or Ca alloy, and it has become possible to effectively perform direct dephosphorization using Ca or Ca alloy. Specifically, molten steel is subjected to deoxidation and desulfurization treatment before reduction dephosphorization treatment. In addition, in order to exhibit the dephosphorizing effect of Ca or Ca alloy, Ca or Ca is added to the iron pipe.
Alloy powder is packed and added to molten steel to prevent Ca evaporation and to reduce the amount of Ca in molten steel during dephosphorization.
The purpose is to maintain it at 0.004% by weight or more. The present invention will be explained below based on an example of direct dephosphorization of 18-8 stainless steel using Ca.
【表】
表１に示す成分の母材をAr雰囲気とした高周
波誘導溶解炉で40Kgを溶解し、脱酸及び脱硫処理
を施して成分調整後、鉄パイプ中にCa及びAlの
粉末をつめたものを溶鋼中に添加し、添加後の溶
鋼中の各種元素の経時変化を調査した。その結果
を脱酸及び脱硫処理を施こさないものと比較して
第１図と第２図に示す。なお鉄パイプ中にAl粉
末をつめたのは、溶鋼中に残存する酸素を脱酸
し、Caが酸素との反応に消費されてしまうのを
防止するためである。
この結果より、溶鋼中のＰを0.02％以下に効率
よく還元するには、脱りん前にあらかじめ脱酸、
脱硫処理を施こし、脱りん中の溶湯中にCaが
0.004％以上に含まれていることが必要であるこ
とが分つた。又、鉄パイプ中にCa粉末をつめて
溶鋼に添加することにより、金属Caを用いて脱
りん処理を行う方法が実現した。
以上、実施例で示した如く、本発明の方法は直
接脱りんを効率よく行うのに非常にすぐれてい
る。[Table] 40 kg of base material with the components shown in Table 1 was melted in a high-frequency induction melting furnace in an Ar atmosphere, and after deoxidation and desulfurization treatment to adjust the components, Ca and Al powder was packed in an iron pipe. were added to molten steel, and the changes over time of various elements in molten steel after addition were investigated. The results are shown in Figures 1 and 2 in comparison with those without deoxidation and desulfurization treatment. The purpose of filling the iron pipe with Al powder is to deoxidize the oxygen remaining in the molten steel and prevent Ca from being consumed by reaction with oxygen. From this result, in order to efficiently reduce P in molten steel to 0.02% or less, it is necessary to deoxidize and
Desulfurization treatment is performed, and Ca is present in the molten metal during dephosphorization.
It was found that it is necessary for the content to be 0.004% or more. In addition, a method of dephosphorizing using metallic Ca was realized by packing Ca powder into an iron pipe and adding it to molten steel. As shown in the examples above, the method of the present invention is extremely excellent in directly performing dephosphorization efficiently.
第１図は未脱酸及び未脱硫処理の脱りん実験の
結果を示す特性図、第２図は予じめ脱酸及び脱硫
処理を施こした後の脱りん効果の一例を示した特
性図である。
Figure 1 is a characteristic diagram showing the results of dephosphorization experiments without deoxidation and non-desulfurization treatment, and Figure 2 is a characteristic diagram showing an example of the dephosphorization effect after previously performing deoxidation and desulfurization treatment. It is.
Claims (1)
環元脱りんする方法において、前記還元脱りんの
前に脱酸及び脱硫処理を行い、その後、Ca又は
Ca合金の粉末を鉄パイプにつめて溶鋼中に添加
し且つ溶鋼中のCa量を0.004重量％以上に保つて
環元脱りんを行うことを特徴とする溶湯の脱りん
法。1 In a method for ring-based dephosphorization of chromium-containing molten steel containing oxygen, sulfur, and phosphorus, deoxidation and desulfurization are performed before the reductive dephosphorization, and then Ca or
A molten metal dephosphorization method characterized by adding Ca alloy powder to an iron pipe and adding it to molten steel, and performing ring element dephosphorization by maintaining the amount of Ca in the molten steel at 0.004% by weight or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20166081A JPS58104131A (en) | 1981-12-16 | 1981-12-16 | Dephosphorizing method for molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20166081A JPS58104131A (en) | 1981-12-16 | 1981-12-16 | Dephosphorizing method for molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58104131A JPS58104131A (en) | 1983-06-21 |
| JPS6254165B2 true JPS6254165B2 (en) | 1987-11-13 |
Family
ID=16444777
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20166081A Granted JPS58104131A (en) | 1981-12-16 | 1981-12-16 | Dephosphorizing method for molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58104131A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357459C (en) * | 2005-10-26 | 2007-12-26 | 本溪冶炼集团有限公司 | Al-Ca-Fe alloy contg. trace carbon, low slilicon, low phosphorus, low sulphur used for steelmaking |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50143715A (en) * | 1974-04-20 | 1975-11-19 | ||
| JPS532323A (en) * | 1976-06-29 | 1978-01-11 | Nippon Steel Corp | Dephosphorization of melting high chromium metal |
| JPS546004A (en) * | 1977-06-15 | 1979-01-17 | Fujitsu Ltd | Light transmitting glass and method of making same |
| JPS5822320A (en) * | 1981-08-03 | 1983-02-09 | Nippon Steel Corp | Process for refining in ladle |
-
1981
- 1981-12-16 JP JP20166081A patent/JPS58104131A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50143715A (en) * | 1974-04-20 | 1975-11-19 | ||
| JPS532323A (en) * | 1976-06-29 | 1978-01-11 | Nippon Steel Corp | Dephosphorization of melting high chromium metal |
| JPS546004A (en) * | 1977-06-15 | 1979-01-17 | Fujitsu Ltd | Light transmitting glass and method of making same |
| JPS5822320A (en) * | 1981-08-03 | 1983-02-09 | Nippon Steel Corp | Process for refining in ladle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58104131A (en) | 1983-06-21 |
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