JPH0440410B2 - - Google Patents
Info
- Publication number
- JPH0440410B2 JPH0440410B2 JP60035140A JP3514085A JPH0440410B2 JP H0440410 B2 JPH0440410 B2 JP H0440410B2 JP 60035140 A JP60035140 A JP 60035140A JP 3514085 A JP3514085 A JP 3514085A JP H0440410 B2 JPH0440410 B2 JP H0440410B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- content
- ultra
- slag
- 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 - Lifetime
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 19
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000007670 refining Methods 0.000 claims description 10
- 239000011819 refractory material Substances 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005261 decarburization Methods 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009849 vacuum degassing Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001339 C alloy Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5211—Manufacture of steel in electric furnaces in an alternating current [AC] electric arc furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/0003—Linings or walls
- F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Description
［発明の目的］
（産業上の利用分野）
この発明は、極低炭素鋼（ただし、この発明に
おいては純鉄と称されるものを含む。）を製造す
るのに利用される極低炭素鋼の製造方法に関する
ものである。
（従来の技術）
極低炭素鋼は、リレー用鉄心、ヨーク、継鉄な
どの軟質磁性材料として使用されるが、このよう
な用途においては保磁力Hcを下げるために含有
炭素量を極低量にする必要がある。従来、このよ
うな極低炭素鋼を製造するに際しては、大気溶解
炉を用いて脱炭を行う方法が採用されていたが、
この場合には耐火物の溶損が著しいため、脱炭に
は限界があつた。また、大気溶解であるために能
率が悪く、コストの上昇をもたらすという問題点
もあつた。そこで、減圧下（ないしは真空下）に
設置した容器内で脱ガス精錬を行ういわゆる真空
脱炭法が採用されることも試みられている。
従来このような真空脱炭法による極低炭素鋼の
製造は、減圧下におけるＣ−Ｏ反応に従つて進行
し、最終的にはかなり低いCO平衡に達するが、
この真空脱炭処理の間において温度低下が生じた
場合には、これを補償するための加熱を行う必要
がある。
（発明が解決しようとする問題点）
そこで、加熱を行う必要が生じた場合には例え
ば電極を用いて加熱することとなるが、従来の通
常の取鍋内における電極加熱では、壁部の耐火物
にハイアルミナ系やMg−Cr系のものを使用した
り、Ｃ含有量の多いMgO−Ｃ系のものを使用し
たりしているため、前者のＣを含まないハイアル
ミナ系やMg−Cr系の耐火物を使用したものでは
加熱時において溶損が大きくなり、とくにスラグ
ラインでの侵食が大になるという問題点を有し、
また後者のＣ含有量の多いMgO−Ｃ系の耐火物
を使用したものでは溶鋼中の炭素量が増加し、炭
素量の低減には限界があり、Ｃ含有量は0.009〜
0.015重量％が限度であるという問題点を有して
いた。
この発明は上述した従来の問題点に着目してな
されたもので、炭素含有量の極めて少ない極低炭
素鋼を低コストで製造することが可能である極低
炭素鋼の製造方法を提供することを目的としてい
る。
［発明の構成］
（問題点を解決するための手段）
この発明による極低炭素鋼（ただし、この発明
では純鉄、合金鋼、ステンレス鋼などを含む）の
製造方法は、減圧（ないしは真空を含む。）下で
加熱精錬をすることにより極炭素鋼を製造するに
際し、容器壁部の耐火物として炭素含有量が３〜
７重量％でかつMgO系が50重量％以上であるも
のを使用し、スラグの塩基度（CaO／SiO2）が
1.5〜10でかつスラグ中のMgO量が５〜25重量％
である範囲に調整して精錬するようにしたことを
特徴としている。
この発明による極低炭素鋼の製造に使用される
精錬容器としては、例えば電極加熱方式の電気炉
や取鍋などが使用され、減圧下ないし真空下にお
いて精錬に供される。
そして、前記の電気炉や取鍋などの壁部の耐火
物としては、炭素含有量が３〜７重量％でかつ
MgO系が50重量％以上であるものが使用される。
ここで、耐火物中の炭素含有量を３〜７重量％と
したのは、炭素含有量が３重量％よりも少ない場
合にはスポーリングが発生しやすくなつて加熱に
耐えないものとなり、耐用寿命が低下するためで
あり、７重量％よりも多い場合には溶鋼中への炭
素の移行が多くなり、溶鋼中の炭素量を低減でき
なくなるためである。また、使用される耐火物は
MgO系が50重量％以上であり、その他のSiO2、
AI2O3、Cr2O3、CaO系…等々のものを含むもの
が使用される。この場合、MgO系が50重量％よ
りも少ないときには、耐火物中のＣが溶鋼中へ移
行して炭素量の低減に限界をもらすので好ましく
ない。
また、この発明においては、スラグの塩基度
（CaO／SiO2）を1.5〜10の範囲に規定するように
しているが、この理由は、上記塩基度が1.5より
も小さいとMgOとSiO2とが反応して耐火物を侵
食し、壁部の耐用寿命を低下するためであり、ま
た、上記塩基度が10よりも大きくなるとスラグの
融点が上昇して操業に支障をきたすためである。
さらに、スラグ中のMgO量が５〜25重量％の
範囲にあるようにしたのは、スラグ中に所要量の
MgOを含有させることによつて耐火物中のMgO
の侵食を防止し、かつまたスラグの塩基度を上記
の値に確保できるようにするためである。
このような耐火物およびスラグ塩基度等の規制
によつて極低炭素鋼の製造が低コストで可能とな
り、軟質磁性材料、快削磁性材料およびその他極
低炭素合金鋼やステンレス鋼などの極低炭素材料
の製造に適用される。
（実施例）
第１表に示す化学成分の純鉄を溶製するに際
し、第２表に示す仕様の電極加熱式取鍋（“IF”
と称することもある）を使用して精錬を行つた。
[Purpose of the invention] (Industrial application field) This invention relates to ultra-low carbon steel used for manufacturing ultra-low carbon steel (including what is referred to as pure iron in this invention). The present invention relates to a manufacturing method. (Prior technology) Ultra-low carbon steel is used as a soft magnetic material for relay cores, yokes, yokes, etc. In such applications, the amount of carbon contained must be extremely low in order to lower the coercive force Hc. It is necessary to Conventionally, when producing such ultra-low carbon steel, a method of decarburizing using an atmospheric melting furnace was adopted.
In this case, there was a limit to decarburization due to significant erosion of the refractories. In addition, there was also the problem that the efficiency was low due to atmospheric dissolution, leading to an increase in cost. Therefore, attempts have been made to employ a so-called vacuum decarburization method in which degassing and refining is performed in a container installed under reduced pressure (or under vacuum). Conventionally, the production of ultra-low carbon steel by such a vacuum decarburization method proceeds according to the C-O reaction under reduced pressure, and eventually reaches a considerably low CO equilibrium.
If a temperature drop occurs during this vacuum decarburization process, it is necessary to perform heating to compensate for this. (Problem to be solved by the invention) Therefore, when it becomes necessary to perform heating, heating is performed using, for example, an electrode. However, in conventional electrode heating in a normal ladle, High-alumina or Mg-Cr-based materials are used, or MgO-C-based materials with a high C content are used. Type refractories have the problem of increased erosion during heating, especially corrosion at the slag line.
Furthermore, in the case of the latter, which uses MgO-C refractories with a high C content, the amount of carbon in the molten steel increases, and there is a limit to reducing the amount of carbon, with the C content ranging from 0.009 to
The problem was that the limit was 0.015% by weight. This invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a method for manufacturing ultra-low carbon steel that can manufacture ultra-low carbon steel with extremely low carbon content at low cost. It is an object. [Structure of the Invention] (Means for Solving the Problems) The method for producing ultra-low carbon steel (including pure iron, alloy steel, stainless steel, etc. in this invention) according to the present invention involves applying reduced pressure (or vacuum). ) When manufacturing ultra-carbon steel by heating and refining under
7% by weight and 50% by weight or more of MgO, and the basicity (CaO/SiO 2 ) of the slag
1.5 to 10 and the amount of MgO in the slag is 5 to 25% by weight
It is characterized by being refined by adjusting it to a certain range. As the refining vessel used for producing the ultra-low carbon steel according to the present invention, for example, an electric furnace or ladle of an electrode heating type is used, and the refining is performed under reduced pressure or vacuum. The refractories for the walls of electric furnaces, ladles, etc. have a carbon content of 3 to 7% by weight.
A material containing 50% by weight or more of MgO is used.
Here, the reason why the carbon content in the refractory is set to 3 to 7% by weight is that if the carbon content is less than 3% by weight, spalling will easily occur and the refractory will not be able to withstand heating. This is because the service life will be reduced, and if the amount is more than 7% by weight, a large amount of carbon will migrate into the molten steel, making it impossible to reduce the amount of carbon in the molten steel. In addition, the refractories used are
MgO type is 50% by weight or more, other SiO 2 ,
Those containing AI 2 O 3 , Cr 2 O 3 , CaO type, etc. are used. In this case, if the MgO content is less than 50% by weight, carbon in the refractory will migrate into the molten steel, which will limit the reduction in carbon content, which is not preferable. In addition, in this invention, the basicity (CaO/SiO 2 ) of the slag is specified in the range of 1.5 to 10. The reason for this is that if the basicity is less than 1.5, MgO and SiO 2 This is because the slag reacts and corrodes the refractories, reducing the service life of the wall. Also, if the basicity is greater than 10, the melting point of the slag will rise, causing problems in operation. Furthermore, the reason why the amount of MgO in the slag was set in the range of 5 to 25% by weight was that the required amount of MgO in the slag was
MgO in refractories by incorporating MgO
This is to prevent corrosion of the slag and to maintain the basicity of the slag at the above value. These regulations on refractories and slag basicity have made it possible to manufacture ultra-low carbon steel at low cost, making it possible to manufacture ultra-low carbon steels at low cost, making it possible to manufacture ultra-low carbon steels such as soft magnetic materials, free-cutting magnetic materials, and other ultra-low carbon alloy steels and stainless steels. Applicable to the production of carbon materials. (Example) When melting pure iron with the chemical composition shown in Table 1, an electrode-heated ladle ("IF") with the specifications shown in Table 2 was used.
) was used for refining.
【表】【table】
【表】
すなわち、電気炉で溶製した鋼中のＣ含有量が
0.2重量％である状態で出鋼したのち第２表に示
す使用の取鍋内に移し、真空脱ガス処理を行つて
溶鋼中の炭素量を0.0023〜0.0030重量％にした。
そして、この処理の間における温度の低下を電極
加熱により補つた。この結果、得られた純鉄中の
Ｃ含有量は0.003〜0.004重量％であつた。またＨ
含有量は0.0002重量％以下、Ｏ含有量は0.005〜
0.006重量％の範囲にあり、著しく品質の安定し
たものであつた。
（比較例）
第１表に示す化学成分の純鉄を溶鋼するに際
し、第３表に示す仕様の電極加熱式取鍋を用いて
精錬を行つた。[Table] In other words, the C content in steel melted in an electric furnace is
After the steel was tapped at a carbon content of 0.2% by weight, it was transferred into a ladle used as shown in Table 2, and subjected to vacuum degassing treatment to bring the carbon content in the molten steel to 0.0023 to 0.0030% by weight.
The temperature drop during this process was then compensated for by electrode heating. As a result, the C content in the pure iron obtained was 0.003 to 0.004% by weight. Also H
Content is 0.0002% by weight or less, O content is 0.005~
The content was in the range of 0.006% by weight, and the quality was extremely stable. (Comparative Example) When pure iron having the chemical composition shown in Table 1 was molten steel, an electrode heating ladle having specifications shown in Table 3 was used for refining.
【表】
そこで、前記実施例と同様にして真空脱ガス処
理を行つて溶鋼中の炭素量を0.0023〜0.0030重量
％にしたのちこの処理の間における温度の低下を
電極加熱により補つた。この結果、得られた純鉄
中のＣ含有量は0.02〜0.03重量％であつた。また
Ｈ含有量は0.0002重量％〜0.0003重量％、Ｏ含有
量は0.0008〜0.022重量％であつて若干のばらつ
きがあると共に上記実施例の場合よりも高い値を
示した。
［発明の効果］
以上説明してきたように、この発明による極低
炭素鋼の製造方法によれば、減圧下で加熱精錬を
することにより極低炭素鋼を製造するに際し、容
器壁部の耐火物として炭素含有量が３〜７重量％
でかつMgO系が50重量％以上であるものを使用
し、スラグの塩基度（CaO／SiO2）が1.5〜10で
かつスラグ中のMgO量が５〜25重量％である範
囲に調整して精錬するようにしたから、耐火物の
溶損を著しく低下させて前記耐火物中からの炭素
の移行をおさえることが可能であるため、炭素量
が著しく少ない極低炭素鋼を得ることが可能であ
り、また極低炭素鋼の品質を安定したものとする
ことができると共に、出鋼間隔の短縮化も可能で
あり、製造コストをかなり低減することができる
という非常に優れた効果がもたらされる。[Table] Therefore, the carbon content in the molten steel was reduced to 0.0023 to 0.0030% by weight by performing vacuum degassing treatment in the same manner as in the above example, and then the temperature drop during this treatment was compensated for by electrode heating. As a result, the C content in the pure iron obtained was 0.02 to 0.03% by weight. Further, the H content was 0.0002% by weight to 0.0003% by weight, and the O content was 0.0008% by weight to 0.022% by weight, with some variation and higher values than in the above examples. [Effects of the Invention] As explained above, according to the method for producing ultra-low carbon steel according to the present invention, when producing ultra-low carbon steel by heating and refining under reduced pressure, As the carbon content is 3-7% by weight
The basicity of the slag (CaO/SiO 2 ) is adjusted to 1.5 to 10 and the MgO content in the slag is 5 to 25% by weight. By refining, it is possible to significantly reduce the erosion of the refractory and suppress the migration of carbon from the refractory, making it possible to obtain ultra-low carbon steel with a significantly lower carbon content. In addition, it is possible to stabilize the quality of ultra-low carbon steel, and it is also possible to shorten the tapping interval, resulting in very excellent effects such as considerably reducing manufacturing costs.
Claims (1)
鋼を製造するに際し、容器壁部の耐火物として炭
素含有量が３〜７重量％でかつMgO系が50重量
％以上であるものを使用し、スラグの塩基度
（CaO／SiO2）が1.5〜10でかつスラグ中のMgO
量が５〜25重量％である範囲に調整して精錬する
ことを特徴とする極低炭素鋼の製造方法。1. When producing ultra-low carbon steel by heating and refining under reduced pressure, a refractory material with a carbon content of 3 to 7% by weight and an MgO content of 50% by weight or more is used for the container wall. , the basicity of the slag (CaO/SiO 2 ) is 1.5 to 10, and the MgO in the slag is
A method for producing ultra-low carbon steel, which comprises refining the steel by adjusting the amount to a range of 5 to 25% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60035140A JPS61194108A (en) | 1985-02-22 | 1985-02-22 | Manufacture of dead soft steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60035140A JPS61194108A (en) | 1985-02-22 | 1985-02-22 | Manufacture of dead soft steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61194108A JPS61194108A (en) | 1986-08-28 |
| JPH0440410B2 true JPH0440410B2 (en) | 1992-07-02 |
Family
ID=12433604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60035140A Granted JPS61194108A (en) | 1985-02-22 | 1985-02-22 | Manufacture of dead soft steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61194108A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4644911B2 (en) * | 2000-06-07 | 2011-03-09 | Ｊｆｅスチール株式会社 | Refractory lining structure for vacuum degassing vessel |
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|---|---|---|---|---|
| DE10325955A1 (en) * | 2003-06-07 | 2004-12-23 | Sms Demag Ag | Process and plant for producing steel products with the best surface quality |
| CN102061351B (en) * | 2010-12-21 | 2012-08-08 | 南阳汉冶特钢有限公司 | Method for producing low-carbon steel and ultra-low-carbon steel by VD, LF and VD processes |
| CN102719615B (en) * | 2012-06-26 | 2013-11-20 | 山西太钢不锈钢股份有限公司 | Smelting method of steel for raw material pure iron |
| CN102864279B (en) * | 2012-09-29 | 2014-08-27 | 莱芜钢铁集团有限公司 | Nitrogen adding method in process of LF (ladle furnace) refining |
| CN108193018B (en) * | 2017-12-25 | 2019-06-28 | 南京钢铁股份有限公司 | A kind of LF refining furnace production anti-carburetion method of low-carbon and low-sulphur steel |
-
1985
- 1985-02-22 JP JP60035140A patent/JPS61194108A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4644911B2 (en) * | 2000-06-07 | 2011-03-09 | Ｊｆｅスチール株式会社 | Refractory lining structure for vacuum degassing vessel |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61194108A (en) | 1986-08-28 |
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