JP2565447B2 - Method for producing ingot of Ni-base super heat-resistant alloy - Google Patents
Method for producing ingot of Ni-base super heat-resistant alloyInfo
- Publication number
- JP2565447B2 JP2565447B2 JP4094873A JP9487392A JP2565447B2 JP 2565447 B2 JP2565447 B2 JP 2565447B2 JP 4094873 A JP4094873 A JP 4094873A JP 9487392 A JP9487392 A JP 9487392A JP 2565447 B2 JP2565447 B2 JP 2565447B2
- Authority
- JP
- Japan
- Prior art keywords
- ingot
- slag
- esr
- resistant alloy
- super heat
- 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
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- Manufacture And Refinement Of Metals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、特定組成のスラグを
用いてインコネル７１８合金（商標名）に相当するＣ
ｒ、Ｍｏ、Ｎｂ、Ａｌ、Ｔｉ、Ｆｅ含有Ｎi基超耐熱合
金鋳塊をエレクトロスラグ再溶解により溶製する製造方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a slag having a specific composition and corresponds to Inconel 718 alloy (trademark) as C
The present invention relates to a manufacturing method for melting an Ni- based super heat-resistant alloy ingot containing r, Mo, Nb, Al, Ti, and Fe by remelting electroslag.
【０００２】[0002]
【従来の技術】Ｎi−Ｆe基超耐熱合金の一例であるイン
コネル（商標）７１８合金の鋳塊を得る場合には、内部
性状を改善するためにエレクトロスラグ再溶解（以下、
ＥＳＲという）により溶製される場合があり、特に大型
の鋳塊では偏析の発生を防止するためにＥＳＲが有効に
利用されている。このＥＳＲにおいても、通常の溶解精
錬法と同様に溶融スラグが使用されている。 ＥＳＲ
は、溶融スラグの電気抵抗熱を熱源として電極を溶解し
て精錬を行うものであり、スラグにもこの方法に適した
ものが選択されている。ＥＳＲ用のスラグとして要求さ
れる性質としては、電気抵抗が大きく、かつ温度による
抵抗変化が小さく、さらに、粘性・表面張力が適当で、
良好な精錬性などを有していることである。このような
観点から、従来、Ｎi−Ｆe基超耐熱合金をＥＳＲで溶製
する際には、ＣaＦ2を主成分として、Ａl2Ｏ3、ＣaＯ、
ＴiＯ2、ＭgＯを適当に配合したスラグが使用されてお
り、具体的には、重量％で、ＣaＦ2：５０％、ＣaＯ：
１９％、Ａl2Ｏ3：２０％、ＴiＯ2：１０％、ＭgＯ：１
％程度のものが現に使用されている。2. Description of the Related Art When obtaining an ingot of Inconel (trademark) 718 alloy which is an example of a Ni-Fe based super heat resistant alloy, electroslag remelting (hereinafter
It may be melted by ESR), and especially in large ingots, ESR is effectively used to prevent the occurrence of segregation. Also in this ESR, the molten slag is used as in the usual melting and refining method. ESR
Is for refining by melting the electrode by using the electric resistance heat of the molten slag as a heat source, and a slag suitable for this method is selected. The properties required for slag for ESR are high electric resistance, small resistance change due to temperature, and appropriate viscosity and surface tension.
It has good refining properties. From such a viewpoint, conventionally, when Ni-Fe based super heat-resistant alloy is melted by ESR, the main component is CaF 2 and Al 2 O 3 , CaO,
A slag appropriately mixed with TiO 2 and MgO is used. Specifically, in terms of weight%, CaF 2 : 50%, CaO:
19%, Al 2 O 3 : 20%, TiO 2 : 10%, MgO: 1
The thing of about% is actually used.
【０００３】[0003]
【発明が解決しようとする課題】Ｎi−Ｆe基超耐熱合金
の中でもインコネル７１８合金のＥＳＲ鋳塊は、表面肌
が悪く鍛造割れを発生しやすい。そのため、鋳塊外表面
を機削りして平滑にした後、鍛造を行っている。しか
し、この方法では、鋳塊表層の緻密層が除去されるた
め、次のような問題が生じている。 (1)外皮の除去により熱間加工性が劣化する。 (2)高品質部分が活用できない。 (3)鋳塊歩留りが低下する。 また、インコネル７１８合金には活性元素であるＴi 、
Ａl 、Ｍg などを含有するが、ＥＳＲ操業中にこれらの
元素が酸化して減少し、歩留りが低下するとともに、歩
留りそのものが非常に不安定になり、組成のばらつきが
大きくなるという問題もある。この発明は、上記事情を
背景としてなされたものであり、ＥＳＲ鋳塊の表面肌を
改善するとともに、活性元素の高く安定した歩留りの確
保をすることができるＮi−Ｆe基超耐熱合金鋳塊の製造
方法を提供することを目的とする。Among the Ni--Fe based super heat resistant alloys, the ESR ingot of Inconel 718 alloy has a poor surface texture and is likely to cause forging cracks. Therefore, the outer surface of the ingot is machined to be smooth and then forged. However, in this method, since the dense layer on the surface of the ingot is removed, the following problems occur. (1) The hot workability deteriorates due to the removal of the outer skin. (2) High quality parts cannot be used. (3) Ingot yield is reduced. Further, Inconel 718 alloy has an active element Ti,
Although it contains Al, Mg and the like, there is a problem that these elements are oxidized and reduced during the ESR operation to reduce the yield, and the yield itself becomes very unstable, resulting in a large variation in composition. The present invention has been made in view of the above circumstances and provides a Ni-Fe-based superheat-resistant alloy ingot which can improve the surface texture of an ESR ingot and can secure a stable yield with a high active element. It is intended to provide a manufacturing method.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するた
め、本願発明は、インコネル７１８合金（商標名）に相
当する、重量％でＮｉ：５０〜５５％、Ｃｒ：１７〜２
１％、Ｍｏ：２．８〜３．３％を含有し、残部が主とし
てＦｅよりなるＮｉ基超耐熱合金鋳塊をエレクトロスラ
グ再溶解により溶製する際に、重量％で、ＣａＦ2：３
８〜５０％、ＣａＯ：２１〜２７％、Ａｌ2Ｏ3：２１〜
２７％未満、ＴｉＯ2：４〜７％からなる組成のスラグ
を使用することを特徴とする。また、上記スラグには、
重量％でＭｇＯ：２〜５％を含有させることも可能であ
る。In order to solve the above-mentioned problems, the present invention corresponds to Inconel 718 alloy (trade name), and Ni: 50 to 55% by weight% and Cr: 17 to 2% by weight.
1%, Mo: 2.8 to 3.3%, with the balance mainly
When an ingot of Ni-based superheat -resistant alloy made of Fe is melted by electroslag remelting, CaF 2 : 3
8~50%, CaO: 21~27%, Al 2 O 3: 21~
It is characterized by using a slag having a composition of less than 27% and TiO 2 : 4 to 7%. Also, the above slag,
It is also possible to include MgO: 2 to 5% by weight.
【０００５】[0005]
【作用】すなわち、本願発明によれば、スラグは、適度
な電気伝導度と流動性を有しており、また、溶融点も適
度な温度に設定されているので、ＥＳＲ中の鋳塊の表面
肌が悪化することがなく、良好な表面肌を有するＥＳＲ
鋳塊が得られる。そして、適当量のＴiＯ2、ＭgＯをス
ラグに含有させることにより、ＥＳＲ鋳塊中に残存する
活性元素の歩留りが向上しかつ安定する。次に、スラグ
の組成限定理由を述べる。ＣaＦ2：３８〜５０％ ＣaＦ2の含有量が３８％未満であると、スラグの流動性
が低下し、スラグスキンの生成により鋳塊肌が悪化す
る。また、５０％を超えて含有させると、電気伝導度が
大きくなるためスラグの発熱量が不足して鋳塊肌が悪化
する。したがって、ＣaＦ2含有量を上記範囲に限定し
た。In other words, according to the present invention, the slag has an appropriate electric conductivity and fluidity, and the melting point is set to an appropriate temperature. Therefore, the surface of the ingot during ESR is ESR that does not deteriorate the skin and has a good surface skin
An ingot is obtained. Then, by containing an appropriate amount of TiO 2 and MgO in the slag, the yield of the active element remaining in the ESR ingot is improved and stabilized. Next, the reasons for limiting the composition of the slag will be described. CaF 2: If the content of 38 to 50% CaF 2 is less than 38%, decreases the fluidity of the slag, the ingot skin is deteriorated by the generation of the slag skin. Further, if the content exceeds 50%, the electrical conductivity increases, and the calorific value of the slag is insufficient, which deteriorates the ingot surface. Therefore, the CaF 2 content is limited to the above range.
【０００６】ＣaＯ：２１〜２７％ ＣaＯの含有量が２１％未満であるとＡl2Ｏ3含有量との
バランスがくずれ、溶融点が上昇して鋳塊肌が悪化する
とともに、脱硫率が著しく低下する。また、２７％を超
えると同様に溶融点が上昇し、鋳塊肌が悪化する。した
がって、ＣaＯ含有量を上記範囲に限定した。Ａl 2 Ｏ 3 ：２１〜２７％未満 Ａl2Ｏ3の含有量が２１％未満であると、電気伝導度が
大きくなりスラグの発熱不足が生じるとともに、ＣaＯ
含有量とのバランスがくずれて溶融点が上昇し、鋳塊肌
が悪化する。また、２７％以上では溶融点が上昇して鋳
塊肌が上昇するので上記範囲に限定した。 CaO: 21-27% When the content of CaO is less than 21 %, the balance with the Al 2 O 3 content is lost, the melting point rises, the ingot surface deteriorates, and the desulfurization rate remarkably increases. descend. Further, if it exceeds 27%, the melting point similarly rises and the ingot surface deteriorates. Therefore, the CaO content is limited to the above range. Al 2 O 3: If the content is less than 21~27% Al 2 O 3 is less than 21%, with heat generation shortage of slag electric conductivity is increased occurs, CaO
The balance with the content is lost, the melting point rises, and the ingot surface deteriorates. Further, if it is 27% or more, the melting point rises and the surface of the ingot rises, so the content is limited to the above range.
【０００７】ＴiＯ 2 ：４〜７％ ＴiＯ2の含有量が４％未満では、活性元素の酸化を有効
に阻止することができない。一方、７％を超えるとＴi
Ｏ2の還元により鋳塊中のＴi 量が著しく増加し、成分
コントロールが困難になるため上記範囲に限定した。ＭｇＯ：２〜５％ ＭｇＯは、選択的にスラグに含有させる。この含有量が
２％未満であるとＭｇの歩留りが良好でなく、一方、５
％を越えると、スラグの溶融点上昇と流動性の低下によ
り、スラグスキンが厚くなり鋳塊肌が悪化するため上記
範囲とした。 TiO 2 : 4 to 7% If the content of TiO 2 is less than 4%, it is impossible to effectively prevent the oxidation of the active element. On the other hand, if it exceeds 7 % Ti
Since the amount of Ti in the ingot increases remarkably due to the reduction of O 2 , it becomes difficult to control the components, so the above range is limited. MgO: 2 to 5% MgO is selectively contained in the slag. If this content is less than 2%, the yield of Mg is not good, while 5
If it exceeds%, the melting point of the slag is increased and the fluidity is lowered, so that the slag skin becomes thick and the ingot surface deteriorates, so the above range was made.
【０００８】[0008]
【実施例】以下に、本発明の実施例を説明する。表１に
示すインコネル７１８相当の組成を有し、微量のＭｇを
含有する合金を溶解して、径８０ｍｍＥＳＲ用の電極を
溶製した。この電極を用いて、表２に示す組成を有する
実施例のスラグを用いてＥＳＲを行った。また、比較の
ために、従来用いられていたスラグと、発明の範囲外の
スラグを用いて同様にＥＳＲを行った。得られたＥＳＲ
鋳塊について表面肌を目視で観察して、良好なものを
○、やや良のものを△、不良なものを×として表２に示
した。また、ＥＳＲ鋳塊中のＡl、Ｔi 、Ｍg の含有量
を、ＥＳＲ電極中の含有量を基準とする歩留りとして表
２に示した。EXAMPLES Examples of the present invention will be described below. It has a composition equivalent to Inconel 718 shown in Table 1 and contains a trace amount of Mg.
The contained alloy was melt | dissolved and the electrode for 80 mm in diameter ESR was manufactured. Using this electrode, ESR was performed using the slags of Examples having the compositions shown in Table 2. In addition, for comparison, ESR was similarly performed using a conventionally used slag and a slag outside the scope of the invention. ESR obtained
The surface texture of the ingot was visually observed, and a good one was indicated by ◯, a slightly good one was indicated by Δ, and a poor one was indicated by x. Further, the contents of Al, Ti and Mg in the ESR ingot are shown in Table 2 as a yield based on the contents in the ESR electrode.
【０００９】この結果、従来のスラグを用いてＥＳＲ鋳
塊を製造すると、表面肌は「やや良好」にとどまってお
り、Ａl 、Ｍg の歩留りも良好ではなかった。さらに、
他の比較例についても、いずれも表面肌は良好ではな
く、また、Ａl 、Ｔi 、Ｍg の歩留りも不十分であっ
た。これに対し、実施例のスラグを用いた場合には、表
面肌は、良好でＡl 、Ｔi、Ｍg の歩留りのいずれも良
好であった。なお、実施例の１つのスラグを、実機の４
５０ｍｍ径ＥＳＲ操業に採用したところ、上記試験と同
様に表面肌が良好で、活性元素の歩留りも良好なＥＳＲ
鋳塊が得られた。As a result, when the ESR ingot was manufactured using the conventional slag, the surface texture was "slightly good" and the yields of Al and Mg were not good. further,
Also in the other comparative examples, the surface texture was not good, and the yields of Al, Ti and Mg were insufficient. On the other hand, when the slag of the example was used, the surface texture was good and the yields of Al, Ti and Mg were all good. In addition, one slag of the embodiment is
When adopted for 50 mm diameter ESR operation, ESR with good surface texture and good yield of active elements as in the above test.
An ingot was obtained.
【００１０】[0010]
【表１】 [Table 1]
【００１１】[0011]
【表２】 [Table 2]
【００１２】[0012]
【発明の効果】以上説明したように、本願発明のＮｉ基
超耐熱合金鋳塊の製造方法によれば、重量％でＮｉ：５
０〜５５％、Ｃｒ：１７〜２１％、Ｍｏ：２．８〜３．
３％を含有し、残部が主としてＦｅよりなるＮｉ基超耐
熱合金鋳塊をエレクトロスラグ再溶解により溶製する際
に、重量％で、ＣａＦ2：３８〜５０％、ＣａＯ：２１
〜２７％、Ａｌ2Ｏ3：２１〜２７％未満、ＴｉＯ2：４
〜７％からなる組成のスラグを使用するので、ＥＳＲ操
業中にスラグが良好な作用を果たし、得られたＥＳＲ鋳
塊の表面肌が改善されるとともに、活性元素の歩留りが
向上し、かつ安定する効果がある。また、スラグ中にさ
らに、重量％でＭｇＯ：２〜５％を含ませることによ
り、ＥＳＲ鋳塊中のＭｇの歩留りが向上する。As described above, according to the method for producing a Ni-base superalloy according to the present invention , Ni: 5% by weight is used.
0-55%, Cr: 17-21%, Mo: 2.8-3.
Ni-based super resistance containing 3% and the balance mainly Fe
When the hot alloy ingot is melted by electroslag remelting, CaF 2 : 38 to 50% by weight, CaO: 21% by weight
~27%, Al 2 O 3: less than 21~27%, TiO 2: 4
Since the slag having a composition of ~ 7% is used, the slag works well during the ESR operation, the surface texture of the obtained ESR ingot is improved, and the yield of the active element is improved and stable. Has the effect of Further, by further adding MgO: 2 to 5% by weight to the slag, the yield of Mg in the ESR ingot is improved.
Claims (2)
７〜２１％、Ｍｏ：２．８〜３．３％を含有し、残部が
主としてＦｅよりなるＮｉ基超耐熱合金鋳塊をエレクト
ロスラグ再溶解により溶製する際に、重量％で、ＣａＦ
2：３８〜５０％、ＣａＯ：２１〜２７％、Ａｌ2Ｏ3：
２１〜２７％未満、ＴｉＯ2：４〜７％からなる組成の
スラグを使用することを特徴とするＮｉ基超耐熱合金鋳
塊の製造方法1. Ni: 50-55% by weight, Cr: 1
7 to 21%, Mo: 2.8 to 3.3%, and the balance
When the Ni-based super heat-resistant alloy ingot composed mainly of Fe is melted by electroslag remelting, the content of CaF
2 : 38 to 50%, CaO: 21 to 27%, Al 2 O 3 :
21 to less than 27%, TiO 2 : 4 to 7% slag having a composition of the composition is used, a manufacturing method of Ni-base super heat-resistant alloy ingot
〜５％を含むことを特徴とする請求項１記載のＮi−Ｆe
基超耐熱合金鋳塊の製造方法2. The slag further contains MgO: 2 in weight%.
Ni-Fe according to claim 1, characterized in that it contains -5%.
Manufacturing method of base super heat-resistant alloy ingot
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4094873A JP2565447B2 (en) | 1992-03-23 | 1992-03-23 | Method for producing ingot of Ni-base super heat-resistant alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4094873A JP2565447B2 (en) | 1992-03-23 | 1992-03-23 | Method for producing ingot of Ni-base super heat-resistant alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05271814A JPH05271814A (en) | 1993-10-19 |
| JP2565447B2 true JP2565447B2 (en) | 1996-12-18 |
Family
ID=14122174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4094873A Expired - Lifetime JP2565447B2 (en) | 1992-03-23 | 1992-03-23 | Method for producing ingot of Ni-base super heat-resistant alloy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2565447B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433447A (en) * | 2011-11-25 | 2012-05-02 | 山西太钢不锈钢股份有限公司 | A kind of slag system for electroslag remelting superalloy and using method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102312105A (en) * | 2010-06-04 | 2012-01-11 | 辽宁天和科技股份有限公司 | Remelted slag for electro-slag remelting titanium-containing plate blank and production method thereof |
| CN113832353A (en) * | 2021-09-15 | 2021-12-24 | 山西太钢不锈钢股份有限公司 | Electroslag smelting process for low-silicon, low-nitrogen and high-aluminum steel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6043890B2 (en) * | 1980-08-01 | 1985-10-01 | 株式会社日本製鋼所 | Method for producing titanium-containing steel by electroslag remelting method |
| JPS58151433A (en) * | 1982-03-04 | 1983-09-08 | Kobe Steel Ltd | Electro-slag remelting method of ni and co superalloys |
| 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 |
-
1992
- 1992-03-23 JP JP4094873A patent/JP2565447B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433447A (en) * | 2011-11-25 | 2012-05-02 | 山西太钢不锈钢股份有限公司 | A kind of slag system for electroslag remelting superalloy and using method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05271814A (en) | 1993-10-19 |
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