JPS6043890B2 - Method for producing titanium-containing steel by electroslag remelting method - Google Patents
Method for producing titanium-containing steel by electroslag remelting methodInfo
- Publication number
- JPS6043890B2 JPS6043890B2 JP55105117A JP10511780A JPS6043890B2 JP S6043890 B2 JPS6043890 B2 JP S6043890B2 JP 55105117 A JP55105117 A JP 55105117A JP 10511780 A JP10511780 A JP 10511780A JP S6043890 B2 JPS6043890 B2 JP S6043890B2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- slag
- electroslag remelting
- steel ingot
- containing steel
- 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
-
- 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
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
【発明の詳細な説明】
本発明はエレクトロスラグ再溶解法（以下ＥＳＲ法とい
う）による含チタン鋼の落髪方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dehairing titanium-containing steel by electroslag remelting method (hereinafter referred to as ESR method).
Ｔｉを含有する鋼はたとえばＳＵＳ３２１鋼のように主
として耐食性が問題となる部分に使用されているが、使
用条件の苛酷化に伴なつてより高品質の鋼が要求される
ようになつてきた。Steel containing Ti, such as SUS321 steel, is mainly used in parts where corrosion resistance is a problem, but as the conditions of use have become more severe, higher quality steel has been required.
しかし、通常の溶解・造塊方法ではクラスター状の窒化
チタンあるいは酸化チタンが鋼塊中に発生して鋼の機械
的性質に悪影響を与えるため、これらの介在物を低減し
たり、均一に分散させたりする必要がある。この問題を
解決するための一方法としてＥＳＲ法があるが、この場
合にはＴｉがスラグと反応して歩留りが大きく変動した
り、鋼塊の肌が悪くなつたりする新たな問題点が生じる
。、”−Λ゛゜『↓’■■゛゛Δｎ、Ｌツ１活性元素で
あるＴｉが優先的に酸化されて鋼塊中のＴｉの歩留りが
減少するが、その減少率が同一鋼塊の高さ方向だけでな
く、鋼塊ごとに大きくばらつくため、工業的な製造は非
常に困難であつた。However, with normal melting and agglomeration methods, clusters of titanium nitride or titanium oxide are generated in the steel ingot, which adversely affects the mechanical properties of the steel. Therefore, it is necessary to reduce or uniformly disperse these inclusions. It is necessary to One method for solving this problem is the ESR method, but in this case, new problems arise such as Ti reacting with the slag, resulting in large fluctuations in yield and deterioration of the texture of the steel ingot. , ”-Λ゛゜『↓'■■゛゛Δn, Ti, which is an active element in L-T1, is preferentially oxidized and the yield of Ti in the steel ingot decreases, but the rate of decrease increases with the height of the same steel ingot. It was extremely difficult to manufacture industrially because of the large variations not only in direction but also from steel ingot to steel ingot.
このＴｉの歩留り向上のためにはＡｒなどの不活性ガス
による雰囲気調整、電極表面に付着したスケールの除去
、酸化物の極力少ないスラグの使用などが考られるが、
これらの処置だけでは不充分であつた。本発明に目的は
、最適なスラグ組成を選定し鋼電極へ川を含有させるこ
とにより、安定した高いＴｉの歩留りが得られかつ鋳肌
の良好な含Ｔｉ鋼の鋼塊の製造方法を提供するにある。Possible ways to improve the yield of Ti include adjusting the atmosphere with an inert gas such as Ar, removing scale attached to the electrode surface, and using slag with as little oxide as possible.
These measures alone were insufficient. An object of the present invention is to provide a method for producing a Ti-containing steel ingot with a stable high yield of Ti and a good casting surface by selecting the optimum slag composition and incorporating slag into the steel electrode. It is in.
本発明においては鋼塊の鋳肌を考慮して、Ｔｉの歩留り
を高くかつ安定させることを試みた。In the present invention, an attempt was made to increase and stabilize the yield of Ti by considering the casting surface of the steel ingot.
その基本的な考えは（ａ）最適なスラグ組成の選定、（
ｂ）Ｎ含有鋼電極の使用の２点である。ＴｉとＡｌを含
有する鋼電極をＥＳＲする場合、スラグ中のＴｉＯ２を
高くしＡｌ２Ｏ３を低くするとＮが優・先的に酸化して
高く安定したＴｉの歩留りが得られるが、鋼塊肌は著し
く悪くなる。The basic idea is (a) selection of the optimal slag composition, (
b) Use of N-containing steel electrodes. When performing ESR on a steel electrode containing Ti and Al, if the TiO2 in the slag is increased and the Al2O3 is decreased, N will be oxidized preferentially and a high and stable Ti yield will be obtained, but the steel ingot surface will be significantly damaged. Deteriorate.
また、逆にＴｉＯ。を低くし川。００を高くすると鋼塊
肌は良好になるがＴｉの歩留りは低く不安定となる。Also, on the contrary, TiO. lower the river. If 00 is increased, the steel ingot surface will be good, but the Ti yield will be low and unstable.
したがつて両者の性質を満足するスラグ組成を選定する
必要がある。そこで、４５７７Ｚ７Ｍφの鋳型を使用し
てＴ１の歩留りと鋼塊肌におよぼすスラグ組成の影響に
ついて調査た結果、両性質を満足するスラグは４０−６
０％ＣａＦ２、１０−３０％ＣａＯｌ５−２５％Ａｌ２
Ｏ３、５−２５％ＡＬ２Ｏ３、５〜２５％ＴｉＯ２系（
以下成分％はすべて重量％基準である）であることがわ
かつた。また、鋼電極中のＡ１含有量は上記のスラグを
使用した場合０．１０％以上であれば８０％以上の安定
した高いＴｉの歩留りが得られることがわかつた。一方
鋼電極中のＮ含有量の上限は製品となる鋼塊のＡＩ含有
量によつて決まるものであるから特に限定しない。つぎ
に本発明を一実施例により図面を参照して説明する。Therefore, it is necessary to select a slag composition that satisfies both properties. Therefore, as a result of investigating the influence of slag composition on the T1 yield and steel ingot surface using a mold of 4577Z7Mφ, the slag that satisfies both properties was found to be 40-6.
0%CaF2, 10-30%CaOl5-25%Al2
O3, 5-25% AL2O3, 5-25% TiO2 system (
It was found that all component percentages below are based on weight percentage. Furthermore, it has been found that when the above-mentioned slag is used, if the A1 content in the steel electrode is 0.10% or more, a stable high Ti yield of 80% or more can be obtained. On the other hand, the upper limit of the N content in the steel electrode is not particularly limited because it is determined by the AI content of the steel ingot that is the product. Next, one embodiment of the present invention will be explained with reference to the drawings.
第１図において水冷式鋼鋳型１内に下部より凝固した鋼
５があり、その上部には溶鋼プール４が形成され、さら
にその上に溶融したスラグ３が滞溜する。電源６の一方
の極に連結されたＮ含有の含チタ７鋼電極２はスラグ３
内にその下端部が浸漬され、一方前記電源６の他の極は
底板を介して凝固した鋼５と連結されているので、通電
すれば高温の溶融スラグ３内て電極２は下端部より溶融
し、溶融した鋼は溶鋼プール４の底部より凝固する。本
実施例において使用した鋳型１は内径８００Ｔｒ＄ｔφ
であり、また使用した電極２およびスラグ３の主要な化
学組成は第１表および第２表に示される。このように、
電極２の材質はＳＵＳ３２ｌ鋼であり、Ｎ含有量を０．
２４％とした。得られた鋼塊は８０『φ×田００？ｅで
あり、重量は７Ｔである。この鋼塊を軸心沿いに縦断し
てその性状を調査した。鋼塊の軸心におけるＴｉ．５Ａ
ｌの分析結果を第２図に示す。同図において、Ｔｉ含．
有量は平均０．３８４％であり、その歩留りは８５％と
高く、しかも鋼塊内で均一であつた。また、Ａ１含有量
はほぼ０．０５０−０．０５５％の範囲にあり、均一で
あつた。また、酸素量は２５−３５ｐｐｍと低く、全介
在物の清浄度は面積率０．０８％以下と従来の製造法に
比較して著しく低かつた。さらに、鋼塊の肌は通常のＥ
ＳＲ鋼塊と同程度であり、次工程の鍛造でも全く問題は
なかつた。このように、本発明により適切なスラグ組成
を選択しかつ鋼電極に０．１０％以上のＡｌを含有させ
て含Ｔｉ鋼をＥＳＲすることにより、高く安定したＴｉ
の歩留りと良好な肌を有する介在物の少ない鋼塊を製造
することが可能となり、その工業的意義は極めて大きい
。In FIG. 1, there is steel 5 solidified from the lower part in a water-cooled steel mold 1, and a molten steel pool 4 is formed in the upper part, and furthermore, molten slag 3 accumulates on top of the molten steel pool 4. The N-containing titanium-containing 7 steel electrode 2 connected to one pole of the power source 6 is connected to the slag 3
The lower end of the electrode 2 is immersed in the molten slag 3, while the other pole of the power source 6 is connected to the solidified steel 5 through the bottom plate. However, the molten steel solidifies from the bottom of the molten steel pool 4. The mold 1 used in this example has an inner diameter of 800Tr$tφ
The main chemical compositions of the electrode 2 and slag 3 used are shown in Tables 1 and 2. in this way,
The material of the electrode 2 is SUS32L steel, and the N content is 0.
It was set at 24%. The obtained steel ingot was 80mm diameter x 00? e, and its weight is 7T. This steel ingot was longitudinally sectioned along its axis to investigate its properties. Ti. at the axis of the steel ingot. 5A
The analysis results of l are shown in Figure 2. In the figure, Ti-containing.
The average content was 0.384%, the yield was as high as 85%, and it was uniform within the steel ingot. Further, the A1 content was approximately in the range of 0.050-0.055% and was uniform. Further, the amount of oxygen was as low as 25-35 ppm, and the cleanliness of all inclusions was significantly lower than the area ratio of 0.08% or less compared to conventional manufacturing methods. Furthermore, the skin of the steel ingot is normal E
It was on the same level as the SR steel ingot, and there were no problems at all in the next process of forging. In this way, by selecting an appropriate slag composition and containing 0.10% or more Al in the steel electrode and performing ESR on Ti-containing steel according to the present invention, highly stable Ti steel can be produced.
This makes it possible to produce a steel ingot with a high yield and a good texture with few inclusions, and its industrial significance is extremely large.
第１図は本発明を実施するためのエレクトロスラグ再溶
解装置の概略説明断面図、第２図は本発明により製造し
た鋼塊の軸心におけるＴｉ，Ａｌの分析結果を示す図で
ある。
１・・・・・・水冷式鋼鋳型、２・・・・・・Ｔｉ含有
鋼電極、３・・・・・・溶融スラグ、４・・・・・・溶
鋼プール、５・・・・・・凝固した鋼、６・・・・・・
電源。FIG. 1 is a schematic cross-sectional view of an electroslag remelting apparatus for carrying out the present invention, and FIG. 2 is a diagram showing the analysis results of Ti and Al in the axial center of a steel ingot manufactured according to the present invention. 1... Water-cooled steel mold, 2... Ti-containing steel electrode, 3... Molten slag, 4... Molten steel pool, 5...・Solidified steel, 6...
power supply.
Claims (1)
において、成分範囲として重量％で４０−６０％ＣａＦ
＿２、１０−３０％ＣａＯ、５−２５％Ａｌ＿２Ｏ＿３
、５−２５％ＴｉＯ＿２を含有するスラグ、および０．
１０％以上のＡｌを含有する鋼電極を使用することを特
徴とするエレクトロスラグ再溶解法による含チタン鋼の
溶製方法。1 In melting titanium-containing steel by electroslag remelting method, the composition range is 40-60% CaF by weight.
_2, 10-30%CaO, 5-25%Al_2O_3
, slag containing 5-25% TiO_2, and 0.
A method for producing titanium-containing steel by an electroslag remelting method, characterized in that a steel electrode containing 10% or more of Al is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55105117A JPS6043890B2 (en) | 1980-08-01 | 1980-08-01 | Method for producing titanium-containing steel by electroslag remelting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55105117A JPS6043890B2 (en) | 1980-08-01 | 1980-08-01 | Method for producing titanium-containing steel by electroslag remelting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5732338A JPS5732338A (en) | 1982-02-22 |
| JPS6043890B2 true JPS6043890B2 (en) | 1985-10-01 |
Family
ID=14398873
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55105117A Expired JPS6043890B2 (en) | 1980-08-01 | 1980-08-01 | Method for producing titanium-containing steel by electroslag remelting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6043890B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02247571A (en) * | 1989-03-20 | 1990-10-03 | Yokogawa Electric Corp | Waveform measuring instrument |
| JP2565448B2 (en) * | 1992-03-23 | 1996-12-18 | 株式会社日本製鋼所 | Method for producing Ni-Fe based super heat-resistant alloy ingot |
| JP2565447B2 (en) * | 1992-03-23 | 1996-12-18 | 株式会社日本製鋼所 | Method for producing ingot of Ni-base super heat-resistant alloy |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54107318A (en) * | 1978-02-09 | 1979-08-23 | Nec Corp | Program searching device of magnetic tape |
-
1980
- 1980-08-01 JP JP55105117A patent/JPS6043890B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5732338A (en) | 1982-02-22 |
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