JPH0762461A - Electroslag remelting method for sulfur-containing steel - Google Patents
Electroslag remelting method for sulfur-containing steelInfo
- Publication number
- JPH0762461A JPH0762461A JP16254293A JP16254293A JPH0762461A JP H0762461 A JPH0762461 A JP H0762461A JP 16254293 A JP16254293 A JP 16254293A JP 16254293 A JP16254293 A JP 16254293A JP H0762461 A JPH0762461 A JP H0762461A
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- Japan
- Prior art keywords
- sulfur
- containing steel
- slag
- powder
- consumable electrode
- Prior art date
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- Manufacture And Refinement Of Metals (AREA)
Abstract
(57)【要約】
【目的】 水冷鋳型の溶損が抑制される含硫黄鋼材のＥ
ＳＲ法を提供する。
【構成】 本発明の含硫黄鋼材のＥＳＲ法は、含硫黄鋼
材を消耗電極とし、減圧下または不活性ガス雰囲気下
で、硫化鉄粉末が混合されているスラグを用いて交流加
熱により前記消耗電極を再溶解することを特徴とする。(57) [Summary] [Purpose] E of sulfur-containing steel materials that suppress the melting loss of water-cooled molds.
The SR method is provided. According to the ESR method of a sulfur-containing steel material of the present invention, the sulfur-containing steel material is used as a consumable electrode, and the consumable electrode is heated by alternating current using slag mixed with iron sulfide powder under reduced pressure or in an inert gas atmosphere. Is redissolved.
Description
【０００１】[0001]
【産業上の利用分野】本発明は含硫黄鋼材のエレクトロ
スラグ再溶解法に関し、更に詳しくは、用いる水冷鋳型
の溶損が少なく、得られた鋳塊の黒皮の厚みも薄くなる
含硫黄鋼材のエレクトロスラグ再溶解法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroslag remelting method for a sulfur-containing steel material, and more particularly to a sulfur-containing steel material in which the water-cooled mold used has little melting loss and the black skin of the obtained ingot is thin. Of electroslag remelting method.
【０００２】[0002]
【従来の技術】エレクトロスラグ再溶解法（Electro Sl
ag Remelting、以下、ＥＳＲ法という）は、消耗電極で
ある所定鋼種のポールと通常は銅で製造されている水冷
鋳型の間に通電し、そのときの抵抗発熱で前記消耗電極
を溶解し、またスラグを溶融し、消耗電極の融滴が溶融
スラグを通過する過程で介在物の浮上分離などを進め、
水冷鋳型の中でそれら融滴を積層凝固させることにより
ポールよりも品質が改善された鋳塊を製造する方法であ
る。2. Description of the Related Art Electroslag remelting method (Electro Sl
Ag remelting (hereinafter referred to as ESR method) is a method in which electricity is supplied between a pole of a predetermined steel type that is a consumable electrode and a water-cooled mold that is usually made of copper, and the consumable electrode is melted by resistance heating at that time. In the process of melting the slag and the molten droplets of the consumable electrode passing through the molten slag, promote the floating separation of inclusions,
It is a method for producing an ingot of which the quality is improved as compared with a pole by stacking and solidifying the molten droplets in a water-cooled mold.
【０００３】このとき、スラグとしては、一般に、Ｃａ
Ｆ2 ，Ａｌ2 Ｏ3 ，ＣａＯ，ＭｇＯなどの各粉末を所定
の割合で混合して成る混合粉末が用いられている。At this time, generally, Ca is used as the slag.
A mixed powder formed by mixing powders of F 2 , Al 2 O 3 , CaO, MgO, etc. at a predetermined ratio is used.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上記したよ
うなＥＳＲ用スラグは、通常、ポールの融滴に対し脱硫
作用もする。しかしながら、スラグの上記脱硫作用は、
Ｓ成分が0.０５〜0.３重量％の範囲内に管理されている
快削鋼のような含硫黄鋼材にとっては不都合な事態を引
き起こす。By the way, the slag for ESR as described above usually also acts to desulfurize the molten droplets of the pole. However, the desulfurization action of slag is
This causes an inconvenient situation for sulfur-containing steel materials such as free-cutting steel in which the S component is controlled within the range of 0.05 to 0.3% by weight.
【０００５】すなわち、Ｓ濃度を上記の規格値範囲内に
設定して溶製，鋳造、鍛造（圧延）したポールに対して
ＥＳＲを行うと、ＥＳＲの進行過程で溶融スラグによっ
てその含有硫黄が脱硫あるいは気化脱硫されてしまい、
その結果、得られた鋳塊のＳ濃度が規格値から外れてし
まうからである。このような問題を解消するためには、
用いるスラグの中に予め所定量のＳ単体の粉末を配合し
ておくことが有効であるように考えられる。That is, when ESR is performed on a pole that has been melted, cast, and forged (rolled) with the S concentration set within the above-specified range, the sulfur contained in the pole is desulfurized by molten slag in the course of ESR. Or it was vaporized and desulfurized,
As a result, the S concentration of the obtained ingot deviates from the standard value. To solve such problems,
It seems to be effective to mix a predetermined amount of powder of S alone in the slag to be used in advance.
【０００６】しかしながら、Ｓ単体の粉末を配合したス
ラグを用いてＥＳＲを行うと、次のような不都合が引き
起こされる。すなわち、Ｓ単体の融点は高々１１５℃程
度であるため、ＥＳＲの初期段階では、まず、スラグ中
に混合されているＳ単体が優先的に溶解してしまう。そ
して、この溶融Ｓは蒸発して水冷鋳型の内壁に膜状に付
着する。However, if ESR is carried out using a slag containing a powder of S simple substance, the following inconveniences occur. That is, since the melting point of the S simple substance is approximately 115 ° C. at the highest, the S simple substance mixed in the slag is preferentially dissolved in the initial stage of ESR. Then, this molten S evaporates and adheres to the inner wall of the water-cooled mold in a film form.
【０００７】ついで、スラグの溶融が進んで溶融スラグ
の液面が上昇すると、上記した膜状に付着しているＳは
加熱され、水冷鋳型の構成材料である銅と反応して、Ｃ
ｕＳのような金属間化合物を生成する。この金属間化合
物は脆弱な材料であるため、流動する溶融スラグや装置
の振動などの外力を受けることにより、水冷鋳型の内壁
から剥落するようになる。すなわち、ＥＳＲの進行過程
で水冷鋳型の溶損が進行する。Then, when the melting of the slag progresses and the liquid level of the molten slag rises, the above-mentioned S adhering in the form of a film is heated and reacts with copper which is a constituent material of the water-cooled mold to form C.
It produces intermetallic compounds such as uS. Since this intermetallic compound is a brittle material, it will come off from the inner wall of the water-cooled mold by being subjected to an external force such as flowing molten slag or vibration of the apparatus. That is, the erosion of the water-cooled mold progresses during the progress of ESR.
【０００８】このため、鋳型の寿命は著しく短くなり、
工業的には不経済な事態が起こる。本発明は、含硫黄鋼
材にＥＳＲを行うときの上記した問題を解決し、水冷鋳
型の溶損が少ない含硫黄鋼材のエレクトロスラグ再溶解
法の提供を目的とする。Therefore, the life of the mold is remarkably shortened,
Industrially uneconomical situations occur. It is an object of the present invention to solve the above-mentioned problems when performing ESR on a sulfur-containing steel material and to provide an electroslag remelting method for a sulfur-containing steel material with less melting loss of a water-cooled mold.
【０００９】[0009]
【課題を解決するための手段】上記した目的を達成する
ために、本発明においては、含硫黄鋼材を消耗電極と
し、減圧下または不活性ガス雰囲気下で、硫化鉄粉末が
混合されているスラグを用いて交流加熱により前記消耗
電極を再溶解することを特徴とする含硫黄鋼材のエレク
トロスラグ再溶解法が提供される。In order to achieve the above object, in the present invention, a slag in which iron sulfide powder is mixed under reduced pressure or in an inert gas atmosphere using a sulfur-containing steel material as a consumable electrode. An electroslag remelting method for a sulfur-containing steel material, characterized in that the consumable electrode is redissolved by alternating current heating using.
【００１０】本発明の最大の特徴は、用いるスラグにＳ
源として硫化鉄の粉末を配合することである。具体的に
は、スラグとして、ＣａＦ2 粉末，Ａｌ2 Ｏ3 粉末，Ｃ
ａＯ粉末、そしてＦｅＳ粉末を混合して成る混合粉末を
用いることである。このＦｅＳは、融点が約１１００℃
と高温であり、そのため、ＥＳＲの初期段階で優先的に
溶解して蒸発することはなく、水冷鋳型の内壁に付着す
ることはない。したがって、水冷鋳型の銅との間で金属
間化合物が生成するという事態は抑制され、水冷鋳型の
溶損は抑制される。The greatest feature of the present invention is that the slag used is S
It is to mix iron sulfide powder as a source. Specifically, as slag, CaF 2 powder, Al 2 O 3 powder, C
It is to use a mixed powder formed by mixing aO powder and FeS powder. This FeS has a melting point of about 1100 ° C.
Therefore, it does not melt and evaporate preferentially in the initial stage of ESR and does not adhere to the inner wall of the water-cooled mold. Therefore, the situation in which an intermetallic compound is formed between the water-cooled mold and copper is suppressed, and the melting loss of the water-cooled mold is suppressed.
【００１１】そして、このＦｅＳにおけるＳ濃度は５０
重量％程度と高濃度であり、しかもその嵩密度は、粒径
にもよるが、概ね、５ｇ／cm3 程度である。このＦｅＳ
粉末は、市販されているＦｅＳ塊を粉砕して容易に製造
することができる。粉末の粒径は、スラグに混合したと
きにその充填密度を高め、かつ、ＥＳＲ時に溶融が容易
になるということから、平均粒径で1.０mm以下に設定す
ることが好ましい。The S concentration in FeS is 50.
It has a high concentration of about 5% by weight, and its bulk density is about 5 g / cm 3 , although it depends on the particle size. This FeS
The powder can be easily manufactured by crushing a commercially available FeS mass. The particle size of the powder is preferably set to 1.0 mm or less in terms of average particle size because it increases the packing density when mixed with the slag and facilitates melting during ESR.
【００１２】このＦｅＳ粉末の配合量は、ポールのＳ濃
度と目的とする鋳塊のＳ濃度とを勘案し、また、Ａｌ2
Ｏ3 −ＣａＦ2 −ＣａＯスラグの硫化物容量（Sulphide
capacities)を勘案して決められる。例えば、電極がＳ
濃度0.０５〜0.３重量％の含硫黄鋼であり、また、スラ
グ本体が、ＣａＦ2 ：２０〜５０重量％，Ａｌ2 Ｏ3 ：
３０〜５０重量％，ＣａＯ：２０〜３０重量％のような
３成分系である場合、このスラグ本体１００重量部に対
し、ＦｅＳ粉末を８〜１５重量部配合することが好まし
い。The blending amount of this FeS powder takes into consideration the S concentration of the pole and the S concentration of the target ingot, and the content of Al 2
O 3 -CaF 2 -CaO slag sulfide capacity (Sulphide
capacities). For example, if the electrode is S
It is a sulfur-containing steel having a concentration of 0.05 to 0.3% by weight, and the slag body has CaF 2 : 20 to 50% by weight, Al 2 O 3 :
In the case of a three-component system such as 30 to 50% by weight and CaO: 20 to 30% by weight, it is preferable to mix 8 to 15 parts by weight of FeS powder with 100 parts by weight of this slag body.
【００１３】８重量部より少ない場合は、電極の脱硫が
進んで得られた鋳塊のＳ濃度が規格値を満たさなくな
り、また、１５重量部よりも多くすると、得られた鋳塊
のボトム部で規格上限値を満たさなくなるからである。
本発明は、特開昭６３−２５９０３１号公報記載のＥＳ
Ｒ法と同じように、減圧下における交流通電で行われ
る。When the amount is less than 8 parts by weight, the desulfurization of the electrode proceeds, and the S concentration of the obtained ingot does not satisfy the standard value. When the amount is more than 15 parts by weight, the bottom portion of the obtained ingot is obtained. This is because the upper limit of the standard will not be satisfied.
The present invention relates to the ES disclosed in JP-A-63-259031.
Similar to the R method, it is performed by AC energization under reduced pressure.
【００１４】減圧の度合は、５０〜５００Torrの範囲に
制限されることが好ましい。この度合が５０Torrより大
きい、すなわち、真空度が低いと、気化しやすいＣａＦ
2 の気化を有効に抑制することができ、ＣａＦ2 の気化
による消耗電極表面への気泡の付着と、それに基づく電
極の位置関係の制御困難を解決できるようになるからで
ある。しかし、減圧の度合が５００Torrを超えると、そ
の雰囲気中には、酸素や水素も混在するようになり、そ
のため、酸素と硫黄との化学反応が起こり、鋳塊におけ
るＳ濃度の制御が困難になるとともに、鋳塊への水素吸
収なども起こり、良好な組織を得にくくなる。The degree of reduced pressure is preferably limited to the range of 50 to 500 Torr. If this degree is greater than 50 Torr, that is, if the degree of vacuum is low, CaF easily vaporizes.
This is because the vaporization of 2 can be effectively suppressed, and the adhesion of bubbles to the surface of the consumable electrode due to the vaporization of CaF 2 and the difficulty in controlling the positional relationship of the electrodes based on it can be solved. However, when the degree of depressurization exceeds 500 Torr, oxygen and hydrogen are also mixed in the atmosphere, so that a chemical reaction between oxygen and sulfur occurs and it becomes difficult to control the S concentration in the ingot. At the same time, hydrogen absorption into the ingot occurs, and it becomes difficult to obtain a good structure.
【００１５】なお、再溶解時には、まず装置内を一旦高
真空にして酸素等の不純物を全て除去し、ついで、ここ
にＡｒガスやＮ2 ガスなどの不活性ガスを導入して、酸
素とＳとの化学反応を防止してもよい。再溶解を交流で
行うのは、特開昭６３−２５９０３１号公報記載の技術
の場合と同じような理由で鋳塊における偏析防止に有効
であるとともに、通常、銅製で製造されている水冷鋳型
の溶損を少なくできるからである。During re-melting, the inside of the apparatus is first evacuated to a high vacuum to remove all impurities such as oxygen, and then an inert gas such as Ar gas or N 2 gas is introduced into the apparatus to remove oxygen and S. You may prevent the chemical reaction with. Performing remelting with an alternating current is effective in preventing segregation in the ingot for the same reason as in the case of the technique described in JP-A-63-259031, and, in addition, the water-cooled mold that is usually made of copper is used. This is because the melting loss can be reduced.
【００１６】[0016]
【実施例】Ｃ：0.１重量％，Ｓｉ：0.１重量％，Ｎｉ：
3.０重量％，Ｍｏ：0.３重量％，Ｃｒ：0.２重量％，
Ｓ：0.１重量％，残部Ｆｅから成る含硫黄鋼を溶製し、
そのインゴットから消耗電極を加工した。銅製の水冷鋳
型を有するＥＳＲ装置に、前記消耗電極をセットし、水
冷鋳型と消耗電極を交流電源に接続した。EXAMPLES C: 0.1% by weight, Si: 0.1% by weight, Ni:
3.0% by weight, Mo: 0.3% by weight, Cr: 0.2% by weight,
S: Sulfur-containing steel consisting of 0.1% by weight and the balance Fe was melted,
A consumable electrode was processed from the ingot. The consumable electrode was set in an ESR device having a water-cooled mold made of copper, and the water-cooled mold and the consumable electrode were connected to an AC power source.
【００１７】ついで、粒径0.２〜1.０mmのＣａＦ2 粉末
２０重量％，粒径0.２〜0.５mmのＡｌ2 Ｏ3 粉末５０重
量％，粒径0.５〜2.０mmのＣａＯ粉末３０重量％を混合
し、得られた混合粉末１００重量部に対し、粒径0.５〜
1.０mmのＳ粉末，粒径0.１〜1.０mmのＦｅＳ粉末をそれ
ぞれ表１に示した割合（重量部）で混合し、スラグ粉末
とした。Then, 20% by weight of CaF 2 powder having a particle size of 0.2 to 1.0 mm, 50% by weight of Al 2 O 3 powder having a particle size of 0.2 to 0.5 mm, and a particle size of 0.5 to 2.0 mm. 30% by weight of CaO powder is mixed with 100 parts by weight of the obtained mixed powder to obtain a particle size of 0.5-0.5.
S powder of 1.0 mm and FeS powder having a particle size of 0.1 to 1.0 mm were mixed at the ratios (parts by weight) shown in Table 1 to obtain slag powder.
【００１８】前記した装置内に上記した各スラグを投入
し、装置内を0.１Torrにまで減圧したのち、ここにＡｒ
ガスを導入して１００Torrとした。消耗電極と水冷鋳型
の間に、電圧４０Ｖ，電流１０ＫＡの交流を通電して消
耗電極の再溶解を行った。得られた鋳塊の組成を分析
し、同時に鋳型の溶損状態を観察した。以上の結果を一
括して表１に示した。Each of the above-mentioned slags was charged into the above-mentioned apparatus, and the pressure inside the apparatus was reduced to 0.1 Torr.
Gas was introduced to 100 Torr. An alternating current having a voltage of 40 V and a current of 10 KA was passed between the consumable electrode and the water-cooled mold to redissolve the consumable electrode. The composition of the obtained ingot was analyzed, and at the same time, the melt damage state of the mold was observed. The above results are collectively shown in Table 1.
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【発明の効果】以上の説明で明らかなように、本発明の
ＥＳＲ法によれば、含硫黄鋼の脱硫作用はあらわれず、
得られた鋳塊のＳ濃度は快削鋼の規定値内に制御されて
いる。そして、鋳型の溶損速度は１／１０〜１／２０程
度に小さくなる。この効果は、本発明方法が用いるスラ
グ内にＦｅＳ粉末を添加したことによってもたらされた
ものである。As is apparent from the above description, according to the ESR method of the present invention, the desulfurization action of sulfur-containing steel does not appear,
The S concentration of the obtained ingot is controlled within the specified value of free-cutting steel. Then, the melting rate of the mold is reduced to about 1/10 to 1/20. This effect is brought about by adding FeS powder in the slag used in the method of the present invention.
Claims (1)
は不活性ガス雰囲気下で、硫化鉄粉末が混合されている
スラグを用いて交流加熱により前記消耗電極を再溶解す
ることを特徴とする含硫黄鋼材のエレクトロスラグ再溶
解法。1. A consumable electrode made of a sulfur-containing steel material, and the consumable electrode is redissolved by alternating-current heating using slag mixed with iron sulfide powder under reduced pressure or in an inert gas atmosphere. Electroslag remelting method for sulfur-containing steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16254293A JPH0762461A (en) | 1993-06-30 | 1993-06-30 | Electroslag remelting method for sulfur-containing steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16254293A JPH0762461A (en) | 1993-06-30 | 1993-06-30 | Electroslag remelting method for sulfur-containing steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0762461A true JPH0762461A (en) | 1995-03-07 |
Family
ID=15756587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16254293A Pending JPH0762461A (en) | 1993-06-30 | 1993-06-30 | Electroslag remelting method for sulfur-containing steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0762461A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2023084898A1 (en) * | 2021-11-09 | 2023-05-19 | ||
| WO2023084897A1 (en) * | 2021-11-09 | 2023-05-19 | デンカ株式会社 | Flux used for electroslag remelting method, method for producing said flux, and method for producing high-purity steel |
| CN117431406A (en) * | 2023-10-24 | 2024-01-23 | 大冶特殊钢有限公司 | A kind of sulfur-containing steel and its electroslag remelting method |
-
1993
- 1993-06-30 JP JP16254293A patent/JPH0762461A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2023084898A1 (en) * | 2021-11-09 | 2023-05-19 | ||
| WO2023084898A1 (en) * | 2021-11-09 | 2023-05-19 | デンカ株式会社 | Flux used in electro-slag remelting process, method for producing said flux, and method for producing high-purity steel |
| WO2023084897A1 (en) * | 2021-11-09 | 2023-05-19 | デンカ株式会社 | Flux used for electroslag remelting method, method for producing said flux, and method for producing high-purity steel |
| JPWO2023084897A1 (en) * | 2021-11-09 | 2023-05-19 | ||
| CN117431406A (en) * | 2023-10-24 | 2024-01-23 | 大冶特殊钢有限公司 | A kind of sulfur-containing steel and its electroslag remelting method |
| CN117431406B (en) * | 2023-10-24 | 2025-11-11 | 大冶特殊钢有限公司 | Sulfur-containing steel and electroslag remelting method thereof |
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