JPS6191317A - Refining method of molten steel by ladle refining furnace - Google Patents

Refining method of molten steel by ladle refining furnace

Info

Publication number
JPS6191317A
JPS6191317A JP21309484A JP21309484A JPS6191317A JP S6191317 A JPS6191317 A JP S6191317A JP 21309484 A JP21309484 A JP 21309484A JP 21309484 A JP21309484 A JP 21309484A JP S6191317 A JPS6191317 A JP S6191317A
Authority
JP
Japan
Prior art keywords
molten steel
nitrogen
gaseous
steel
yield
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.)
Pending
Application number
JP21309484A
Other languages
Japanese (ja)
Inventor
Hirohisa Nakajima
中島　廣久
Yoshimi Komatsu
喜美 小松
Masabumi Ikeda
正文 池田
Tsuneo Kondo
恒雄 近藤
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan 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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP21309484A priority Critical patent/JPS6191317A/en
Priority to US06/675,947 priority patent/US4551173A/en
Publication of JPS6191317A publication Critical patent/JPS6191317A/en
Pending 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

PURPOSE:To produce a high nitrogen steel contg. nitrogen at a prescribed ratio at a stable yield and low cost in the stage of producing the high-nitrogen steel in a ladle refining furnace by blowing gaseous nitrogen by a bubbling lance into the molten steel. CONSTITUTION:Gaseous Ar is blown by the gaseous Ar bubbling lance 4 into the molten steel in the ladle refining furnace 1 to stir the molten steel by which the component adjustment by addition of an alloy iron and refining such as dephosphorization and desulfurization are executed. The gas blow from the lance 4 is changed over from Ar to N2 in the state in the non-oxidation atmo sphere to blow the gaseous N2 into the molten steel so that the N2 is incorpo rated at the prescribed ratio into the molten steel. The high-nitrogen steel is produced at a high yield of about 60% yield by using inexpensive gaseous N2.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、取鍋精錬炉を用いて溶鋼中に所定　、量の窒
素を含有せしめる方法に関する゛。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for containing a predetermined amount of nitrogen in molten steel using a ladle refining furnace.

〔従来の方法〕[Conventional method]

従来、高窒素鋼を溶製するには、溶鋼中に窒化マンガン
を添加して溶鋼中の窒素量を高めていた。Conventionally, in order to produce high nitrogen steel, manganese nitride was added to the molten steel to increase the amount of nitrogen in the molten steel.

〔発明が解決しようとする技術的課題〕しかし窒化マン
ガンは、歩留が不安定で、一定量の窒化マンガンを加え
ても溶鋼中の窒素含有量の幅が大きく、所望の窒素含有
量とすることが困難である。また、溶鋼中にマンガンが
加わるため、溶鋼のマンガン含有量が増加変動しやすい
。しかも窒化マンガンは、コストが高く製造コストが高
くなってしまう。[Technical problem to be solved by the invention] However, the yield of manganese nitride is unstable, and even if a certain amount of manganese nitride is added, the nitrogen content in molten steel varies widely, and it is difficult to obtain the desired nitrogen content. It is difficult to do so. Furthermore, since manganese is added to the molten steel, the manganese content of the molten steel tends to increase and fluctuate. Moreover, manganese nitride is expensive and the manufacturing cost is high.

、本発明は、上記事情に鑑みてなされたもので、千の目
的とするところは、安定した歩留で安価１・１、ｊ に溶鋼中に窒素を含有せしめることができる取鍋精錬炉
による溶鋼の精錬方法な得んとするものである。The present invention has been made in view of the above circumstances, and its main purpose is to provide a ladle refining furnace that can contain nitrogen in molten steel at a stable yield and at a low cost. This is an advantageous method for refining molten steel.

〔発明の構成〕[Structure of the invention]

本抛明は、無酸化雰囲気下にある取鍋精錬炉内の溶−に
バブリングランスから窒素ガスを吹込んで溶鋼中に所定
量の窒素を含有せしめる溶鋼の、竺錬方法である。This method is a molten steel refining method in which nitrogen gas is blown from a bubbling lance into the molten steel in a ladle refining furnace under a non-oxidizing atmosphere to contain a predetermined amount of nitrogen in the molten steel.

以下本発明の詳細な説明する。The present invention will be explained in detail below.

取鍋精・錬炉は、転炉から出鋼された溶鋼につ　　。Ladle refining and refining furnaces are used for molten steel tapped from converters.

い゛て、成゛分調整、脱リン、脱硫などを行なうもので
あり、第１図に示すように取鍋１を水冷蓋２で密閉し、
取鍋１内に電極３・・・を挿入して溶鋼を加熱できるよ
うにし、又パプリングランス４・・・を挿入してここか
ら溶鋼中にアルゴンガスな吹込み、無酸化雰囲気中で溶
鋼を攪拌できるようにな蒐ている。　　゛ 本発明では、アルゴンガスによる攪拌後、吹込ガスをア
ルゴンから窒素に切換えてバブリングランス４から窒素
ガスを吹込み、溶鋼中に所定量の窒素ガスを含有せしめ
るす窒素ガスの吹込み量は、窒素ガスの歩留が６（１前
後であることから、これを基準として設定する。It is used to perform component adjustment, dephosphorization, desulfurization, etc. As shown in Figure 1, the ladle 1 is sealed with a water-cooled lid 2.
An electrode 3 is inserted into the ladle 1 to heat the molten steel, and a pupling lance 4 is inserted to blow argon gas into the molten steel to heat the molten steel in a non-oxidizing atmosphere. It is sown that it can be stirred.゛In the present invention, after stirring with argon gas, the blowing gas is switched from argon to nitrogen and nitrogen gas is blown from the bubbling lance 4 to make the molten steel contain a predetermined amount of nitrogen gas.The amount of nitrogen gas blown is as follows: Since the nitrogen gas yield is around 6 (1), this is set as the standard.

〔発明の効果〕〔Effect of the invention〕

本発明によれば、窒化マンガンに代えて窒素ガスを用い
ているので１歩留が安定しくこのことは以下の実施例：
：て確認された）、所望の窒素含有量の素鋼を確実に得
ることができ゛る。またマンガンが更に加わるようなこ
ともなく、成分調整が容易である。しかも窒素ガスは安
価であるので、コストを安くすることができる。According to the present invention, since nitrogen gas is used instead of manganese nitride, the yield is stable, and this is demonstrated in the following examples:
), it is possible to reliably obtain raw steel with the desired nitrogen content. In addition, there is no need to further add manganese, and component adjustment is easy. Moreover, since nitrogen gas is inexpensive, costs can be reduced.

〔実施例〕〔Example〕

無酸化雰囲気下で溶鋼中に窒素ガスを吹込んだ場合（本
発明）と、溶鋼中に窒化マンガンな吹込んだ場合（従来
例）とにつき、窒素成分の添加量と溶鋼中の窒素含有量
の増加量との関係晶べた。その結果を第２図に示す。Addition amount of nitrogen component and nitrogen content in molten steel for cases where nitrogen gas is injected into molten steel in a non-oxidizing atmosphere (invention) and when manganese nitride is injected into molten steel (conventional example) The relationship between the amount of increase in The results are shown in FIG.

第一２図から本発明のものは、歩留６０チ前後にあり１
歩留のバラツキが少ない。一方従来例のものは、平均し
て歩留３０−であるが、歩留のバラツキが、ｔ　Ｌ　＜
　、歩留が不安定であることがわかる、As shown in Figure 12, the yield of the present invention is around 60 inches.
There is little variation in yield. On the other hand, the conventional example has an average yield of 30-, but the variation in yield is t L <
, it can be seen that the yield is unstable,

【図面の簡単な説明】[Brief explanation of drawings]

第１図は取鍋精錬炉の概略説明図、第２図は窒素添加量
と溶鋼中の窒素含有量の増加量との関係を示す図である
。 １・・・取鍋、２・・・水冷蓋、３・・・電極、４′・
・・バブリングランス。FIG. 1 is a schematic explanatory diagram of a ladle refining furnace, and FIG. 2 is a diagram showing the relationship between the amount of nitrogen added and the amount of increase in nitrogen content in molten steel. 1... Ladle, 2... Water cooling lid, 3... Electrode, 4'.
...bubbling lance.

Claims (1)

【特許請求の範囲】[Claims] 無酸化雰囲気下にある取鍋精錬炉内の溶鋼にバブリング
ランスから窒素ガスを吹込んで溶鋼中に所定量の窒素を
含有せしめる取鍋精錬炉による溶鋼の精錬方法。A method for refining molten steel using a ladle refining furnace in which nitrogen gas is blown into the molten steel in the ladle refining furnace under a non-oxidizing atmosphere through a bubbling lance to make the molten steel contain a predetermined amount of nitrogen.
JP21309484A 1984-07-12 1984-10-11 Refining method of molten steel by ladle refining furnace Pending JPS6191317A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP21309484A JPS6191317A (en) 1984-10-11 1984-10-11 Refining method of molten steel by ladle refining furnace
US06/675,947 US4551173A (en) 1984-07-12 1984-11-28 Method for adjusting composition of molten steel in arc process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21309484A JPS6191317A (en) 1984-10-11 1984-10-11 Refining method of molten steel by ladle refining furnace

Publications (1)

Publication Number Publication Date
JPS6191317A true JPS6191317A (en) 1986-05-09

Family

ID=16633458

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21309484A Pending JPS6191317A (en) 1984-07-12 1984-10-11 Refining method of molten steel by ladle refining furnace

Country Status (1)

Country Link
JP (1) JPS6191317A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015098635A (en) * 2013-11-20 2015-05-28 株式会社日本製鋼所 Electrode for electroslag re-melting and method of producing high-nitrogen-content steel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5589416A (en) * 1978-12-27 1980-07-07 Nisshin Steel Co Ltd Preparation of nitrogen containing steel
JPS57137413A (en) * 1981-02-20 1982-08-25 Nisshin Steel Co Ltd Production of molten steel containing nitrogen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5589416A (en) * 1978-12-27 1980-07-07 Nisshin Steel Co Ltd Preparation of nitrogen containing steel
JPS57137413A (en) * 1981-02-20 1982-08-25 Nisshin Steel Co Ltd Production of molten steel containing nitrogen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015098635A (en) * 2013-11-20 2015-05-28 株式会社日本製鋼所 Electrode for electroslag re-melting and method of producing high-nitrogen-content steel

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