JPS61194108A - Manufacture of dead soft steel - Google Patents

Manufacture of dead soft steel

Info

Publication number
JPS61194108A
JPS61194108A JP60035140A JP3514085A JPS61194108A JP S61194108 A JPS61194108 A JP S61194108A JP 60035140 A JP60035140 A JP 60035140A JP 3514085 A JP3514085 A JP 3514085A JP S61194108 A JPS61194108 A JP S61194108A
Authority
JP
Japan
Prior art keywords
weight
content
slag
refractory
ultra
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.)
Granted
Application number
JP60035140A
Other languages
Japanese (ja)
Other versions
JPH0440410B2 (en
Inventor
Kiyoshi Takei
清 武井
Hideyuki Oma
英之 大間
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daido Steel Co Ltd
Original Assignee
Daido Steel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daido Steel Co Ltd filed Critical Daido Steel Co Ltd
Priority to JP60035140A priority Critical patent/JPS61194108A/en
Publication of JPS61194108A publication Critical patent/JPS61194108A/en
Publication of JPH0440410B2 publication Critical patent/JPH0440410B2/ja
Granted legal-status Critical Current

Links

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)

Abstract

PURPOSE:To manufacture a dead soft steel having a remarkably low carbon content by regulating the composition of a refractory for the wall of a vessel and the basicity of slag so as to reduce the erosion of the refractory. CONSTITUTION:When a dead soft steel is manufactured by heating and refining under reduced pressure, a refractory having 3-7wt% carbon content and >=50wt% MgO content is used as a refractory for the wall of an electric furnace and the wall of a vessel such as a ladle. The refining is carried out so as to regulate the basicity (CaO/SiO2) of slag to 1.5-10 and the MgO content to 5-25wt%.

Description

【発明の詳細な説明】 ［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。[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention is applicable to the production of ultra-low carbon steel (including what is referred to as pure iron in this invention). The present invention relates to a method for producing ultra-low carbon steel.

（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Ｈｅを下げるために含有炭素星を極低騒にする
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、
脱炭には限界があった。また、大気溶解であるために能
率が悪く、コストの１昇をもたらすという問題点もあっ
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。(Prior art) Ultra-low carbon steel is used as a soft magnetic material for relay cores, yokes, yokes, etc. In such applications, carbon stars containing carbon are used to reduce the coercive force He. It is necessary to Conventionally, when manufacturing such ultra-low carbon steel, a method of decarburizing using an atmospheric melting furnace was adopted, but in this case, the refractories were subject to significant erosion, so
There were limits to decarbonization. In addition, since it is dissolved in the atmosphere, there is a problem that the efficiency is low and the cost increases by 1. 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).

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−〇反応に従って進行し、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。Conventionally, the production of ultra-low carbon steel by such a vacuum decarburization process proceeds according to the C-〇 reaction under reduced pressure, eventually reaching a fairly low CO equilibrium, but during this vacuum decarburization process, the temperature If a drop occurs, it is necessary to perform heating to compensate for this.

（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Ｍ
　ｇ　−Ｃｒ系のものを使用したり、Ｃ含有量の多いＭ
ｇ０−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Ｍ　ｇ　−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Ｍｇ０−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０．００９〜０．０１
５重量％が限度であるという問題点を有していた。(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 type and M
g -Using Cr-based materials or using M with a high C content
Because g0-C type products are used, the former C
Refractories using high alumina or Mg-Cr refractories, which do not contain
In particular, there is a problem of increased corrosion in the slag line, and in the case of the latter, which uses Mg0-C refractories with a high C content, the amount of carbon in the molten steel increases, making it difficult to reduce the amount of carbon. There is a limit, and the C content is 0.009 to 0.01
The problem was that the limit was 5% by weight.

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。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.

〔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！（ただし、この発明では純鉄
１合金鋼、ステンレス鋼などを含む）の′３１Ｊ造方法
は、減圧（ないしは真空を含む、）下で加熱精錬をする
ことにより極度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玉量％でかつＭｇＯ系が５
０重量％以りであるものを使用し、スラグの塩基度（Ｃ
ａＯ／ＳｉＯ２）が１．５〜１０でかつスラグ中のＭｇ
Ｏ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。[Structure of the invention] (Means for solving the problem) Ultra-low carbon by this invention! (However, in this invention, the '31J manufacturing method includes pure iron 1 alloy steel, stainless steel, etc.). As the wall refractory, the carbon content is 3 to 7% and the MgO type is 5%.
The basicity of the slag (C
aO/SiO2) is 1.5 to 10 and Mg in the slag
It is characterized in that the amount of O is adjusted to a range of 5 to 25% by weight during refining.

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１例えば電極加熱方式の電気炉や取鍋などが使
用され、減圧下ないしは真空下において精錬に供される
。The refining vessel used in the production of the ultra-low carbon steel according to the present invention is, for example, an electric furnace or ladle using an electrode heating method, and is subjected to refining under reduced pressure or vacuum.

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重敬％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
くなっ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５ｉ０２　、Ａ１２０３
　、Ｃｒ２０３　、ＣａＯ系・・・等々のものを含むも
のが使用される。この場合。The refractories used for the walls of electric furnaces, ladles, etc. have a carbon content of 3 to 7% by weight and an MgO content of 50% by weight or more. Here, the reason why the carbon content in the refractory is 3 to 7% is that the carbon content is 3% to 7%.
If it is less than 7% by weight, spalling will easily occur and it will not be able to withstand heating, resulting in a shortened service life.If it is more than 7% by weight, carbon will migrate into the molten steel. This is because the amount of carbon in the molten steel cannot be reduced. In addition, the refractories used are MgO-based at least 50% by weight, and others include 5i02, A1203
, Cr203, CaO type, etc. are used. in this case.

Ｍ　ｇ　Ｃ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た
らすので好ましくない。When the M g C system content is less than 50% by weight, it is not preferable because C in the refractory migrates into the molten steel and brings about a limit to the reduction in carbon content.

また、この発明においては、スラグの塩基度（Ｃａｏ／
　Ｓ　ｉ　０２　）を１　、５〜１０ノ範囲に規制する
ようにしているが、この理由は、１記塩基度が１．５よ
りも小さいとＭｇＯと５ｉ０２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と昇
して操業に支障をきたすためである。In addition, in this invention, the basicity of the slag (Cao/
The reason for this is that if the basicity is less than 1.5, MgO and 5i02 will react and corrode the refractories. This is because the service life of the wall portion is reduced, and when the basicity is greater than 10, the melting point of the slag rises, causing problems in operation.

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
させることによって耐火物中のＭｇＯの侵食を防！ヒし
、かつまたスラグの塩基度をに記のイダ目こ確保できる
ようにするためである。Furthermore, the reason why the amount of MgO in the slag is in the range of 5 to 25% by weight is to prevent corrosion of MgO in the refractory by containing the required amount of MgO in the slag! This is to ensure that the basicity of the slag is maintained as described below.

このような耐火物およびスラグ塩基度等の規制によって
極低炭素鋼の製造が低コストで可能となり、軟′！ｌ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。These regulations on refractories, slag basicity, etc. have made it possible to manufacture ultra-low carbon steel at low cost, making it possible to produce soft, low-carbon steel at low cost. l Applicable to the production of magnetic materials, free-cutting magnetic materials, and other ultra-low carbon materials such as ultra-low carbon alloy steels and stainless steels.

（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（“ＬＦ”と称することも
ある）を使用して精錬を行った。(Example) When melting pure iron with the chemical composition shown in Table 1, an electrode-heated ladle (sometimes referred to as "LF") with the specifications shown in Table 2 was used for refining. .

第　　　１　　　表 夏 第　　　２　　　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表に示す仕様の取鍋
内に移し、真空脱ガス処理を行って溶鋼中の炭素量を０
．００２３〜０．００３０ｍ１％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った。Table 1 Summer Table 2 In other words, the steel melted in an electric furnace is tapped with a C content of 0.2% by weight, then transferred to a ladle with the specifications shown in Table 2, and de-evacuated in a vacuum. Gas treatment reduces the amount of carbon in molten steel to 0
．． 0023 to 0.0030 m1%. The temperature drop during this treatment was then compensated for by electrode heating.

この結果、得られた純鉄中のＣ含有量は０．００３〜０
．００４重量％であった。またＨ含有量は０．０００２
重量％以下、０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った・ （比較例） 第１表に示す化学成分の純鉄を溶製するに際し、第３表
に示す仕様の電極加熱式取鍋を用いて精錬を行った。As a result, the C content in the pure iron obtained was 0.003 to 0.
．． It was 0.004% by weight. Also, the H content is 0.0002
Weight% or less, 0 content is 0.005-0.006% by weight
(Comparative example) When melting pure iron with the chemical composition shown in Table 1, an electrode-heated ladle with the specifications shown in Table 3 was used. Refined.

第　　　３　　　表 そこで、前記実施例と同様にして真空脱ガス処理を行っ
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Ｆを電極加熱
により補った。この結果、得られた純鉄中のＣ含有量は
０．０２〜０．０３重量％であった。またＨ含有量は０
．０００２重量％〜０．０００３重量％、０含有量はｏ
　、ｏｏｏａ〜０．０２２重量％であって若干のばらつ
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
。Table 3 Therefore, vacuum degassing treatment was carried out in the same manner as in the previous example to reduce the amount of carbon in the molten steel to 0.0023 to 0.0030% by weight.
The low temperature during this process was then compensated for by electrode heating. As a result, the C content in the obtained pure iron was 0.02 to 0.03% by weight. Also, the H content is 0
．． 0002% by weight to 0.0003% by weight, 0 content is o
, oooa to 0.022% by weight, with some variation and higher values than those of the above examples.

［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／Ｓ
ｉＯ２）が１．５〜１０でかつスラグ中のＭｇ０ｌが５
〜２５重着％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。[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 carbon content is 3 to 7% by weight and MgO type is 50% by weight
The basicity of the slag (CaO/S
iO2) is 1.5 to 10 and Mg0l in the slag is 5
Since the refining is adjusted to a range of 25% to 25%, it is possible to significantly reduce the erosion of the refractory and suppress the migration of carbon from the refractory, so the amount of carbon can be reduced. It is possible to obtain extremely low carbon steel with significantly less
In addition, the quality of the ultra-low carbon steel can be made stable, the tapping interval can be shortened, and manufacturing costs can be considerably reduced, which is an extremely excellent effect.

Claims (1)

【特許請求の範囲】[Claims] （１）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／ＳｉＯ＿２）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, use a refractory material for the container wall that has a carbon content of 3 to 7% by weight and an MgO content of 50% by weight or more. The ultra-low carbon steel is produced by adjusting and refining the slag to have a basicity (CaO/SiO_2) of 1.5 to 10 and an amount of MgO in the slag of 5 to 25% by weight. Production method.
JP60035140A 1985-02-22 1985-02-22 Manufacture of dead soft steel Granted JPS61194108A (en)

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 true JPS61194108A (en) 1986-08-28
JPH0440410B2 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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004108971A3 (en) * 2003-06-07 2005-03-31 Sms Demag Ag Method and installation for the production of steel products having an optimum surface quality
CN102061351A (en) * 2010-12-21 2011-05-18 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
CN102719615A (en) * 2012-06-26 2012-10-10 山西太钢不锈钢股份有限公司 Smelting method of steel for raw material pure iron
CN102864279A (en) * 2012-09-29 2013-01-09 莱芜钢铁集团有限公司 Nitrogen adding method in process of LF (ladle furnace) refining
WO2019128285A1 (en) * 2017-12-25 2019-07-04 南京钢铁股份有限公司 Anti-carburetion method for producing low-carbon and low-sulfur steel by means of lf refining furnace

Families Citing this family (1)

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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

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004108971A3 (en) * 2003-06-07 2005-03-31 Sms Demag Ag Method and installation for the production of steel products having an optimum surface quality
US7998237B2 (en) 2003-06-07 2011-08-16 Sms Siemag Aktiengesellschaft Method and installation for the production of steel products having an optimum surface quality
CN102061351A (en) * 2010-12-21 2011-05-18 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
CN102719615A (en) * 2012-06-26 2012-10-10 山西太钢不锈钢股份有限公司 Smelting method of steel for raw material pure iron
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