JPS61513A - Manufacture of steel and its apparatus - Google Patents
Manufacture of steel and its apparatusInfo
- Publication number
- JPS61513A JPS61513A JP59120574A JP12057484A JPS61513A JP S61513 A JPS61513 A JP S61513A JP 59120574 A JP59120574 A JP 59120574A JP 12057484 A JP12057484 A JP 12057484A JP S61513 A JPS61513 A JP S61513A
- Authority
- JP
- Japan
- Prior art keywords
- tuyere
- furnace
- lid
- inert gas
- refining
- 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
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
-
- 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)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
発明の目的 purpose of invention
本発明は、鋼の製造方法および装置に関する。
本発明により、スクラップの溶解と精錬の二つの工程が
、ひとつの容器を用いた一員作業により実施できる。The present invention relates to a method and apparatus for manufacturing steel. According to the present invention, the two processes of scrap melting and refining can be carried out by one worker using one container.
炉外精錬方法としては、RH,DHSFINKL−MO
HR,LF、AOD法等があるが、これらの方法は脱ガ
ス能力、脱硫および脱酸能力、溶湯の補熱能力あるいは
、精錬効率等の諸点で一長一短があった。 出願人は、
こうした問題の解決策として、脱硫および脱ガスを電極
加熱と不活性ガスおよび造滓剤吹き込みの併用により短
時間で実現する炉外精錬技術を確立し、rGRAFJ法
と名づけですでに開示した(特公昭5’l−55773
号)。
さぎに提案の内容は、次のようなものである。
すなわち、精錬装置は、傾動可能な精錬容器と、不活性
ガスをキャリヤガス、とじて造滓剤または添加合金を溶
湯内へ吹き込む羽口と、溶湯および造滓剤を加熱する電
極とをそなえ、電極加熱時には羽口が溶湯面より上に位
置するものを使用する。
代表的な態様においては、ポーラスプラグから不活性ガ
スを吹込みながら電極加熱し、スラグ精錬により主とし
て脱酸、脱ガスおよび脱硫を行なう。
次に、前記羽口が溶湯の底部にくるように精錬炉を傾け
、高圧で多量の不活性ガスおよび造滓剤を吹きこみ、脱
酸、脱硫、脱窒素および脱水素精錬を行ない、得られた
溶鋼をスライディングノズルから鋳型または取鍋に移注
する。As the outside furnace refining method, RH, DHSFINKL-MO
There are HR, LF, AOD methods, etc., but these methods have advantages and disadvantages in various points such as degassing ability, desulfurization and deoxidizing ability, molten metal reheating ability, and refining efficiency. The applicant is
As a solution to these problems, we have established an out-of-furnace refining technology that achieves desulfurization and degassing in a short time by combining electrode heating and inert gas and slag-forming agent injection, which we have already disclosed under the name rGRAFJ method (special Kosho 5'l-55773
issue). The contents of Sagini's proposal are as follows. That is, the refining device includes a tiltable refining container, a tuyere for blowing an inert gas into a carrier gas and a slag-forming agent or an additive alloy into the molten metal, and an electrode for heating the molten metal and the slag-forming agent, When heating the electrode, use one whose tuyere is located above the molten metal surface. In a typical embodiment, the electrode is heated while blowing inert gas through a porous plug, and deoxidation, degassing, and desulfurization are mainly performed by slag refining. Next, the smelting furnace is tilted so that the tuyeres are at the bottom of the molten metal, and a large amount of inert gas and slag-forming agent are blown in at high pressure to perform deoxidation, desulfurization, denitrification, and dehydrogenation refining. The molten steel is transferred from a sliding nozzle to a mold or ladle.
上述の技術においては、アーク加熱中に吹き込む少量の
ガスは溶湯面下に設けたポーラスプラグにより、精錬時
に吹き込む高圧の大量のガスは溶湯面より上に設は精錬
時に溶湯面の下に位置する羽口により、それぞれ吹き込
む。 このため、精錬炉を傾ける操作を必要とし、装置
の構造が複雑となり、作業がはん雑である。 また従来
使用されてきたポーラスプラグは消耗しやすいという問
題もあった。 また、溶解している金属の精錬だけでな
く、冷スクラップなどの冷材の溶解から精錬まで一貫し
て同じ炉で行なうことが望ましい。
それによって生産能率が大いに高まり、エネルギーを節
減できる。
ところで、ガスの吹き込み量を広い範囲にわたって調節
することができる羽口があれば、それを溶湯面の下に設
けることにより、精錬炉を傾動する必要がなくなり、装
置の構造が簡単になり、操作も容易になる。
本発明者らは、このような観点からガスの圧力をあまり
変化させずに流量は広い範囲にわたって調節できる羽口
の開発を進め、ニードルタイプの羽口を完成して[炉用
ガス吹込口Jとしてすでに提案した。(特願昭59−6
9539号)発明の構成In the above technology, a small amount of gas blown in during arc heating is handled by a porous plug placed below the molten metal surface, and a large amount of high-pressure gas blown in during refining is placed above the molten metal surface, while a porous plug is placed below the molten metal surface during refining. Each is blown through the tuyere. Therefore, it is necessary to tilt the refining furnace, which complicates the structure of the device and makes the work complicated. Another problem is that the porous plugs that have been used in the past are easily worn out. Furthermore, it is desirable that not only the refining of molten metal but also the melting and refining of cold materials such as cold scrap be performed in the same furnace. This greatly increases production efficiency and saves energy. By the way, if there were a tuyere that could adjust the amount of gas blown over a wide range, it would be possible to install it below the molten metal surface, eliminating the need to tilt the refining furnace, simplifying the structure of the equipment, and making it easier to operate. It also becomes easier. From this point of view, the present inventors have proceeded with the development of a tuyere that can adjust the flow rate over a wide range without changing the gas pressure much, and have completed a needle-type tuyere [furnace gas inlet J]. has already been proposed. (Special application 1986-6
No. 9539) Structure of the invention
【問題点を解決するための手段1
本発明は、上記の「炉用ガス吹込口」の技術を前記rG
RAFJ精錬の技術に適用することによリ、それを拡充
したものである。
本発明の鋼の製造方法は、基本的には、吹き込むガスの
量を、それもできるだけ広い範囲にわたって変化さける
ことのできる下吹羽口を備えた溶解−精錬炉炉体にスク
ラップを装入し、電極孔を有する蓋をして電極を挿入し
、前記下吹羽口から少量の不活性ガスを吹き込みながら
アーク加熱してスクラップを溶解し、ついで前記下吹羽
口からは大量の不活性ガスおよび(または)酸素を吹き
込み、強く攪拌しながら精錬を行なうとともに必要な合
金元素を添加して成分を調整し、このようにして得た所
望の組成の鋼を出鋼口を通して出鋼することを特徴とす
る。
本発明の鋼の製造方法の、酸素吹錬上好ましい形態は、
吹き込むガスの量を広い範囲にわたって変化させること
のできる下吹羽口を備えた溶解−精錬炉炉体にスクラッ
プを装入し、電極孔を有す(る蓋をして電極を挿入し、
前記下吹羽口から少量の不活性ガスを吹き込みながらア
ーク加熱してスクラップを溶解し、ついで電極と蓋を取
り除き、二次燃焼用羽口と集煙口とを有する蓋をして、
二次燃焼用羽口から不活性ガスおよび(または)酸素を
吹き込み、前記下吹羽口からは大量の不活性ガスおよび
(または)酸素を吹き込み、強く攪拌しながら精錬を行
なうとともに必要な合金元素を添加して成分を調整し、
このようにして得た所望の組成の鋼を出鋼口を通して出
鋼することを特徴とする。
上記の鋼の製造方法を実施するための本発明の装置は、
第1図ならびに第2図へおよびBに示すように、吹き込
むガスの量を広い範囲にわたって変化させることのでき
る下吹羽口1、および出鋼口(図示した例ではスライデ
ィングノズル)22を備えた炉体2に、アーク加熱用電
極5を挿入する電極孔を有する蓋3、ならびに(または
)二次燃焼用羽口6および集煙口41を有する蓋4を組
み合わせたことを特徴とする。 21は出滓口である。
【作 用】
ガスの流量を調節することができる下吹羽口を炉内の溶
湯面下に設けることにより、アーク加熱時には、第1図
に示すように、羽口の開口部が溶損したり閉塞したりし
ない程度の少量の不活性ガスを吹き出すことができる。
従ってポーラスプラグは不要であり、アークの不安定
化や、強い攪拌により溶湯が電極に接触してC量が高ま
る、といった問題が解決できる。
一方、精錬時には、第2図へまたはBに示すように、下
吹羽口から大壷の不活性ガスおよび酸素ガスを吹き込ん
で溶湯を強く攪拌できる。 また第2図Aに示すように
二次燃焼羽口を用いる場合は、それから不活性ガスとと
もに、または単独で、酸素ガスを吹き出すことによって
炉内で生成したCOを二次燃焼させ、その熱で溶湯を補
熱することができる。
[実施態様l
下吹羽口1は、前記した本発明者らのニードルタイプの
ものが、ガス流量の調節できる範囲が広く、有用である
。 本発明に適用した場合の構造は、第3図に示すよう
に、ともに先端部が炉内に開口する細径部111および
121と、それに連設されガス供給−接続口13および
14を有する大径部112および113とからなる内管
11と外管12との二重筒体を有し、内管内に一部が挿
入されるニードル15とこのニードルをその先端が炉内
開口端である前進位置D1と内管内の後退位ID2との
間の位置にくるように駆動させる手段、たとえば油圧装
置(図示していない)を備えたものである。
本発明の実施に当っては、前記した溶解−精錬炉炉体を
2基使用し、溶解と精錬に交互に使用するツイン・ファ
ーネス型が有利である。 すなわち、第4図■に示すよ
うに、一方の炉体2Aにはスクラップ8を装入して電極
孔を有する蓋3をし、電極5を挿入してアーク加熱によ
るスクラップ溶解を行ない、その間、他方の炉体2Bに
は二次燃焼用羽口6と集煙口41とを有する蓋4をして
不活性ガスおよび酸素を吹き込んで精錬し、成分調整を
する。 所望の鋼9を製造したら、第4図■に示すよう
に出鋼して、その後に第4図■に示すようにスクラップ
を装入し、2基の炉の蓋3および4を相互におきかえる
。 続いて第4図■に示すように、前記一方の炉2Aに
おいては精錬および成分の調整を行ない、他方の炉2B
においては電極5を挿入してアーク加熱によるスクラッ
プ溶解を行なう。
炉2Aにおける精錬が終了したら、第4図Vに示すよう
に出鋼し、第4図■に示すようにスクラップを装入する
。 この間、他方の炉2Bにおいては、アーク溶解が進
行する。 すると第4図Iの状態に戻り、以後、上記の
操作をくりかえす。
【実施例]
次の組成の材料を炉内に装入し、以下に記す工程に従っ
て溶解および精錬を行ない、5US304を製造した。
チョッパー 430KaSUH368
00K(I
FCr H5720K(1
’ MNi 22OK。
Ca0 100に!J鉄打板屑
610K(13,500に!]
下吹ニードル羽口からArを60ONm 3 /分で吹
き込みながら、約60分間アーク加熱後、ざらに鉄打板
屑600Kgを連装しアーク加熱を行なうと、約45分
で装入したスクラップの大部分が溶解した。
さらにアーク加熱を続け、温度が1630℃に達したと
ごろでアーク加熱用の電極と蓋とを取り除き、Me−N
i 2OK(1、Ga 025K(+および軽焼ドロマ
イト50K(]を投入して、二次燃焼羽口および集煙口
を有する蓋をした。 蓋を置いたときの炉内の温度は、
1545℃であった。
下吹ニードル羽口からArガスを65ONm3/分、酸
素ガスを230ONm3/分の割合で吹き込み、二次燃
焼羽口からArガスを15ONm3/分、酸素ガスを1
30ONII13/分の速度で吹き込み、20分間第1
期精錬(脱炭)を行なった。 さらに、下吹ニードル羽
口からはArガス65ONm3/分および酸素ガス18
0ONm 3/分を吹き込み、二次燃焼羽口からはAr
ガス15ONII13/分、酸素ガス80ONn+ 3
/分を吹き込み約15分間第2期精錬(脱炭)を行な
った。
Ca025KoおよびMNi 65KOを投入したのち
、ひき続き、下吹ニードル羽口からArガス185ON
m3/分、酸素ガス100ONm 3/分、二次燃焼羽
口からはrガス150、酸素ガス25ONm3/分を吹
き込み、約15分間、第3期精錬を行なった。 温度は
1770℃に達していた。
その後、下吹ニードル羽口からArガス60ONm3/
分を吹き込みながら、FSi 2を8K(]、FCr
)−16を3KO投入し、約1550℃まで冷却したの
もざらにFSi 2を3Kg、FSを1Kg添加し、下
吹ニードル羽口から300〜40ONII13/分の窒
素を吹き込みながら、溶鋼をスライディングノズルを通
してインゴットに訪込んだ。
得られた鋼はつきの組成を有し、
C:0.039%、Si :0.26%、Mrl:1
゜94%、P:0.020%、S:0.015%、CO
:0. 03%、Ni:8、11%、Cr:18.50
%およびMO:Q、038%
5US304の規格を満足するものであった。
上記実施例の成分回収率を表に示す。
Crの回収率は99.9%、Niの回収率は99゜5%
と非常に高い値であることがわかる。 従来技術では、
Orの回収率は96%、Ni回収率は97%である。
また、従来の方法では97%であった出鋼メタルの歩留
りが、98.8%に向上していた。
出鋼メタル歩留−出鋼間/装入量−(0口、入
炙−年 初期投入時 後入
れ 合 計成分(%) (ko)
工脱) (ka)AC2,0268,30
,268,5
Si O,4615,557,072,5Mn
2.48 83.8 0
B3.8P O,0140,500,
5S O,0100,30,50,8CI
O,031,001,ONi 7.
26 275.4 26.0 271.4
Cr 17.91 605.4 10゜
7 616.IMo O,0170,60
0,6X回収率−A/Bx100(%)
ス量+810ス量)xloo
出 回収率舛鋳造品
ロ ス (%)成分(%>
(kg)B(ka)0.039 1.3
67.2 −0.26 8,7
63.8 、 −1.94 64.6
19.2 77.10.020 0.7
+0.2 −0.015 0.
5 0.3 −0.03 1.
0 0 1008.11 270.0
1.4 99.518.50 615
.9 0.2 99.90.038
1.3 ±0 100Bat 23
65.0 20.8 99.1発明の効果
本発明によれば、スクラップの溶解力1ら精錬および鋳
込みに至る鋼の製造を、−貫して同じ炉で行なうことが
できる。 装置は簡易であり、操作は容易である。 炉
体の傾動を必要としなI7)ことは、いわゆるフリーボ
ード、すなわち湯面h\ら炉の縁までの必要な高さを減
らせることを、換言すれば炉の容積をいっばいに使える
ことを意味する。
高温の溶湯の移しかえをしないことが、熱エネルギーの
節約に大きく寄与すること(よ当然である。
とくに、好ましい実施態様であるツイン・ファーネス型
では、2種の炉蓋が交換されながら連続的に使用され、
炉体の放冷による熱ロスかわず力鬼しかないから、省エ
ネルギー効果が著しい。 もちろん、2期の炉体と2枚
1組の炉蓋の組み合わせは、電源が1基分で足りること
とあいまって、装置の建設費の面でも有利である。
またCrおJ、びNi等の高価な原料の歩留りがよいこ
とは、コスト低減に役立つ。
消耗が激しく、破損した場合に対処困難であつ心ポーラ
スプラグが不要となることは、装置のメンテナンスおよ
び安全の向上という点から有利である。[Means for solving the problem 1] The present invention applies the technology of the above-mentioned "furnace gas inlet" to the rG
It has been expanded by applying it to the RAFJ refining technology. The steel manufacturing method of the present invention basically involves charging scrap into a melting and refining furnace body equipped with a lower blowing tuyere that allows the amount of gas to be blown to be varied over a wide range as much as possible. , insert the electrode with a lid having an electrode hole, melt the scrap by arc heating while blowing a small amount of inert gas from the lower blowing tuyere, and then blowing a large amount of inert gas from the lower blowing tuyere. and/or refining while blowing oxygen and stirring vigorously, adding necessary alloying elements to adjust the composition, and tapping the thus obtained steel with the desired composition through a tapping port. Features. A preferable form of the method for manufacturing steel of the present invention in terms of oxygen blowing is as follows:
Scrap is charged into a melting and refining furnace body equipped with a lower blowing tuyere that can vary the amount of gas blown over a wide range, and the furnace body is covered with an electrode hole and an electrode is inserted thereinto.
Arc heating is performed to melt the scrap while blowing a small amount of inert gas from the lower blowing tuyere, then the electrode and the lid are removed, and a lid having a secondary combustion tuyere and a smoke collection port is placed,
Inert gas and/or oxygen is blown into the secondary combustion tuyere, and a large amount of inert gas and/or oxygen is blown into the lower blowing tuyere, and the necessary alloying elements are refined while being strongly stirred. Adjust the ingredients by adding
The method is characterized in that the steel having the desired composition obtained in this manner is tapped through a tapping port. The apparatus of the present invention for carrying out the above steel manufacturing method includes:
As shown in FIGS. 1 and 2 and B, a lower blowing tuyere 1 that can vary the amount of gas blown over a wide range, and a tapping port 22 (sliding nozzle in the illustrated example) are provided. It is characterized in that the furnace body 2 is combined with a lid 3 having an electrode hole into which an arc heating electrode 5 is inserted, and/or a lid 4 having a secondary combustion tuyere 6 and a smoke collection port 41. 21 is a slag outlet. [Function] By providing a lower blowing tuyere below the surface of the molten metal in the furnace that can adjust the gas flow rate, the opening of the tuyere can be prevented from being melted or damaged during arc heating, as shown in Figure 1. A small amount of inert gas can be blown out without causing blockages. Therefore, a porous plug is not necessary, and problems such as instability of the arc and strong stirring that causes the molten metal to come into contact with the electrode and increase the amount of C can be solved. On the other hand, during refining, as shown in FIG. 2 or B, the molten metal can be strongly stirred by blowing inert gas and oxygen gas from a large pot through the lower tuyere. If a secondary combustion tuyere is used as shown in Figure 2A, then oxygen gas is blown out together with inert gas or alone to cause secondary combustion of the CO generated in the furnace, and the resulting heat is used to Can reheat molten metal. [Embodiment 1] The needle type lower blowing tuyere 1 made by the present inventors described above is useful because the gas flow rate can be adjusted over a wide range. The structure when applied to the present invention is, as shown in FIG. It has a double cylindrical body consisting of an inner tube 11 and an outer tube 12, each having diameter portions 112 and 113, and a needle 15 that is partially inserted into the inner tube. It is provided with a means for driving it to a position between the position D1 and the retreated position ID2 in the inner tube, such as a hydraulic device (not shown). In carrying out the present invention, it is advantageous to use a twin furnace type in which two of the aforementioned melting-refining furnace bodies are used alternately for melting and refining. That is, as shown in FIG. 4, scrap 8 is charged into one furnace body 2A, a lid 3 having an electrode hole is placed on the furnace body 2A, an electrode 5 is inserted, and the scrap is melted by arc heating. The other furnace body 2B is covered with a lid 4 having a secondary combustion tuyere 6 and a smoke collection port 41, and inert gas and oxygen are blown thereinto for refining and component adjustment. After producing the desired steel 9, tap the steel as shown in Fig. 4 (■), then charge the scrap as shown in Fig. 4 (■), and replace the lids 3 and 4 of the two furnaces with each other. . Subsequently, as shown in FIG.
In this step, the electrode 5 is inserted and the scrap is melted by arc heating. When the refining in the furnace 2A is completed, the steel is tapped as shown in FIG. 4V, and scrap is charged as shown in FIG. 4■. During this time, arc melting progresses in the other furnace 2B. Then, the state returns to the state shown in FIG. 4I, and the above operation is repeated thereafter. [Example] Materials having the following composition were charged into a furnace and melted and refined according to the steps described below to produce 5US304. Chopper 430KaSUH368
00K (I FCr H5720K (1' MNi 22OK. Ca0 to 100! J Iron hammered board scrap
610K (to 13,500!) After arc heating for about 60 minutes while blowing Ar at 60ONm 3 /min from the bottom blowing needle tuyere, 600Kg of hammered iron plate scraps were installed in parallel and arc heating was performed for about 45 minutes. Most of the charged scrap was melted. Arc heating was continued, and when the temperature reached 1630°C, the arc heating electrode and lid were removed and the Me-N
i 2OK (1, Ga 025K (+) and lightly calcined dolomite 50K () were put in, and a lid with secondary combustion tuyere and smoke collection port was placed. The temperature inside the furnace when the lid was placed was:
The temperature was 1545°C. Ar gas was blown at a rate of 65ONm3/min and oxygen gas was blown at a rate of 230ONm3/min from the bottom blowing needle tuyere, and Ar gas was blown at 15ONm3/min and oxygen gas was blown at 1.
Blow at a rate of 30ONII 13/min, the first for 20 minutes.
Stage refining (decarbonization) was carried out. Furthermore, from the downward blowing needle tuyere, Ar gas 65ONm3/min and oxygen gas 18
0ONm3/min is blown into the secondary combustion tuyeres.
Gas 15ONII13/min, oxygen gas 80ONn+ 3
/min, and second stage refining (decarburization) was performed for about 15 minutes. After introducing Ca025Ko and MNi 65KO, 185ON Ar gas was added from the bottom blowing needle tuyere.
The third stage refining was carried out for about 15 minutes by blowing 150 m3/min of oxygen gas and 25 ON m3/min of oxygen gas from the secondary combustion tuyeres. The temperature had reached 1770°C. After that, Ar gas 60ONm3/
FSi 2 to 8K (], FCr
)-16 was added, 3Kg of FSi 2 and 1Kg of FS were added, and the molten steel was poured into the sliding nozzle while blowing nitrogen at 300 to 40 ONII 13/min from the bottom blowing needle tuyere. I visited the ingot through. The obtained steel has the following composition: C: 0.039%, Si: 0.26%, Mrl: 1
゜94%, P: 0.020%, S: 0.015%, CO
:0. 03%, Ni: 8, 11%, Cr: 18.50
% and MO:Q, 038%, which satisfied the standards of 5US304. The component recovery rates of the above examples are shown in the table. Cr recovery rate is 99.9%, Ni recovery rate is 99.5%.
It can be seen that this is a very high value. In the conventional technology,
The recovery rate of Or is 96%, and the recovery rate of Ni is 97%. In addition, the yield of tapped metal, which was 97% in the conventional method, was improved to 98.8%. Tapping metal yield - tapping time/charging amount - (0 mouths, roasting - year Initial loading Later loading Total composition (%) (ko)
(Ka) AC2,0268,30
,268,5 SiO,4615,557,072,5Mn
2.48 83.8 0
B3.8P O,0140,500,
5S O,0100,30,50,8CI
O,031,001,ONi 7.
26 275.4 26.0 271.4
Cr 17.91 605.4 10°7 616. IMo O,0170,60
0.6X recovery rate - A/B x 100 (%) Amount + 810S amount)
Loss (%) Component (%>
(kg)B(ka)0.039 1.3
67.2 -0.26 8,7
63.8, -1.94 64.6
19.2 77.10.020 0.7
+0.2 -0.015 0.
5 0.3 -0.03 1.
0 0 1008.11 270.0
1.4 99.518.50 615
.. 9 0.2 99.90.038
1.3 ±0 100Bat 23
65.0 20.8 99.1 Effects of the Invention According to the present invention, steel production from scrap melting power to refining and casting can be carried out in the same furnace. The device is simple and easy to operate. The fact that the furnace body does not need to be tilted (17) means that the required height from the hot water level h\ to the edge of the furnace can be reduced, which means that the volume of the furnace can be used all at once. means. Not having to transfer high-temperature molten metal greatly contributes to saving thermal energy (of course). In particular, in the twin furnace type, which is the preferred embodiment, the two types of furnace lids are exchanged continuously. used for
Since there is no heat loss due to cooling of the furnace body, there is only power loss, so the energy saving effect is remarkable. Of course, the combination of a second-stage furnace body and a set of two furnace lids is advantageous in terms of equipment construction costs, as only one power source is sufficient. In addition, high yields of expensive raw materials such as Cr, J, and Ni are useful for cost reduction. Eliminating the need for highly wearable, difficult to manage, and damaged core porous plugs is advantageous from the standpoint of improved device maintenance and safety.
第1図および第2図は本発明の精錬装置の断面図であっ
て、第1図はアーク溶解時のようすを示し、第2図Aお
よびBは、いずれも精錬時のようすを示す。
第3図は、本発明の精錬装置にそなえることが好まし、
い羽口の構造を示す、第1図および第2図の一部の拡大
断面図である。
第4図は、本発明の製造方法の好ましい態様を示す、観
念的な説明図である。
1・・・下吹羽口
2・・・炉体
3・・・アーク加熱用蓋
4・・・精錬用蓋
5・・・アーク加熱電極
6・・・二次燃焼羽口
特許出願人 人同特殊鋼株式会社
代理人 弁理士 須 賀 総 大
筒1111
第2図A
算2図3
手続補正書(白側
昭和59年7月10日
特許庁長官 志 賀 学 殿
1、事件の表示
昭和59年特許願第120574号
2、発明の名称
鋼の製造方法および装置
3、補正をする者
事件どの関係 特許出願人
住 所 愛知県名古屋市南区星崎町字繰出66番地名
称 (371)大同特殊鋼株式会社4、代理人〒1
04
住 所 東京都中央区築地二丁目15番14号安田不
動産築地ビル v (541) 3792明細書の発明
の詳細な説明の欄
6、補正の内容
明細書の下記の個所にある単位“’Nm 3 /分″を
「N237分」と訂正する。
第12頁第3行、第14行、第15行、第16/17行
、第17行、第20行および第20行/第13頁第1行
第13頁第2行く2カ所)、第6行、第8行、第12行
および第16行1 and 2 are cross-sectional views of the refining apparatus of the present invention, with FIG. 1 showing the state during arc melting, and FIGS. 2A and 2 B both showing the state during refining. FIG. 3 is preferably provided in the refining apparatus of the present invention,
FIG. 2 is an enlarged cross-sectional view of a portion of FIGS. 1 and 2 showing the structure of the tuyere. FIG. 4 is a conceptual explanatory diagram showing a preferred embodiment of the manufacturing method of the present invention. 1... Bottom blowing tuyere 2... Furnace body 3... Arc heating lid 4... Refining lid 5... Arc heating electrode 6... Secondary combustion tuyere patent applicant Jindo Special Steel Co., Ltd. Agent Patent Attorney Suga So Otsutsu 1111 Figure 2 A Calculation 2 Figure 3 Procedural Amendment (White Side July 10, 1980 Commissioner of the Patent Office Manabu Shiga 1, Indication of Case 1988 Patent Application No. 120574 2, Name of the invention Steel manufacturing method and apparatus 3, Person making the amendment, Incident and relationship Patent applicant address 66, Hoshizaki-cho, Minami-ku, Nagoya, Aichi Prefecture Name (371) Daido Steel Co., Ltd. Company 4, agent 〒1
04 Address: Yasuda Fudosan Tsukiji Building, 2-15-14 Tsukiji, Chuo-ku, Tokyo v (541) 3792 Unit "'Nm" in column 6 of the detailed explanation of the invention in the specification, and in the following part of the statement of contents of the amendment 3 / minute" is corrected to "N237 minutes." Page 12, line 3, line 14, line 15, line 16/17, line 17, line 20 and line 20/page 13, line 1, page 2, 2 places), 6th line, 8th line, 12th line and 16th line
Claims (5)
羽口および出鋼口を備えた溶解−精錬炉炉体にスクラッ
プを装入し、電極孔を有する蓋をして電極を挿入し、前
記下吹羽口から少量の不活性ガスを吹き込みながらアー
ク加熱してスクラップを溶解し、ついで前記下吹羽口か
ら大量の不活性ガスおよび酸素を吹き込み、強く攪拌し
ながら精錬を行なうとともに必要な合金元素を添加して
成分を調整し、このようにして得た所望の組成の鋼を出
鋼口を通して出鋼することを特徴とする鋼の製造方法。(1) Scrap is charged into a melting and refining furnace body equipped with a lower blowing tuyere and tapping port that can change the amount of gas blown into the furnace, a lid having an electrode hole is placed, and an electrode is inserted; The scrap is melted by arc heating while blowing a small amount of inert gas from the lower blowing tuyere, and then a large amount of inert gas and oxygen is blown from the lower blowing tuyere to perform refining while stirring strongly. A method for producing steel, which comprises adjusting the composition by adding alloying elements, and tapping the thus obtained steel having a desired composition through a tapping port.
羽口および出鋼口を備えた溶解−精錬炉炉体にスクラッ
プを装入し、電極孔を有する蓋をして電極を挿入し、前
記下吹羽口から少量の不活性ガスを吹き込みながらアー
ク加熱してスクラップを溶解し、ついで電極と蓋を取り
除き、二次燃焼用羽口と集煙口とを有する蓋をして、二
次燃焼用羽口から不活性ガスおよび(または)酸素を吹
き込み、下吹羽口からは大量の不活性ガスまたは不活性
ガスおよび酸素を吹き込み、強く攪拌しながら精錬を行
なうとともに必要な合金元素を添加して成分を調整し、
このようにして得た所望の組成の鋼を出鋼口を通して出
鋼することを特徴とする鋼の製造方法。(2) Charge the scrap into a melting and refining furnace body equipped with a lower blowing tuyere and tapping port that can change the amount of gas blown into the furnace, cover with a lid having electrode holes, and insert electrodes; The scrap is melted by arc heating while blowing a small amount of inert gas through the lower tuyere, then the electrode and lid are removed, and a lid having a secondary combustion tuyere and a smoke collection port is placed on the secondary combustion tuyere. Inert gas and/or oxygen is blown in from the combustion tuyere, and a large amount of inert gas or inert gas and oxygen is blown in from the lower blowing tuyere. Refining is carried out with strong stirring, and necessary alloying elements are added. to adjust the ingredients,
A method for producing steel, which comprises tapping the thus obtained steel having a desired composition through a tapping port.
体にはスクラップを装入して電極孔を有する蓋をし、電
極を挿入してアーク加熱によるスクラップ溶解を行ない
、その間、他方の炉体には二次燃焼用羽口と集煙口とを
有する蓋をして、不活性ガスおよび酸素を吹き込んで精
錬し、成分調整をして所望の鋼を製造し、出鋼してその
後にスクラップを装入し、2基の炉の蓋を相互におきか
え、前記一方の炉においては精錬および成分の調整を行
ない、他方の炉においてはアーク加熱によるスクラップ
溶解を行ない、以後、上記の操作をくりかえすことから
なる特許請求の範囲第2項に記載の鋼の製造方法。(3) Two of the above-mentioned melting and refining furnace bodies are used, one of the furnace bodies is charged with scrap and covered with a lid having an electrode hole, and an electrode is inserted to perform scrap melting by arc heating, Meanwhile, the other furnace body is covered with a lid having secondary combustion tuyere and smoke collection port, and inert gas and oxygen are blown into the furnace to refine it, adjust the composition, and produce the desired steel. After that, scrap is charged, the lids of the two furnaces are replaced, and one furnace is used for refining and composition adjustment, and the other furnace is used for melting scrap by arc heating. The method for manufacturing steel according to claim 2, which comprises repeating the above operations.
ることのできる下吹羽口および出鋼口を備えた炉体に、
アーク加熱用電極を挿入する電極孔を有する蓋、ならび
に(または)二次燃焼用羽口および集煙口を有する蓋を
組み合わせたことを特徴とする鋼の製造装置。(4) A furnace body equipped with a lower blowing tuyere and tapping port that can vary the amount of gas blown over a wide range,
A steel manufacturing device characterized by combining a lid having an electrode hole into which an electrode for arc heating is inserted, and/or a lid having a tuyere for secondary combustion and a smoke collection port.
細径部とそれに連設されガス供給管接続口を有する大径
部とからなる内管と外管との二重筒体を有し内管内に一
部が挿入されるニードルと、このニードルをその先端が
炉内開口端である前進位置と内管の大径部にある後退位
置との間に位置するように駆動させる装置を備えたニー
ドル羽口を使用した特許請求の範囲第4項に記載の鋼の
製造装置。(5) As a lower blowing tuyere, a double cylindrical body consisting of an inner tube and an outer tube, each consisting of a small diameter part whose tip opens into the furnace and a large diameter part connected to the small diameter part and which has a gas supply pipe connection port. a needle with a part inserted into the inner tube, and the needle is driven so that its tip is located between the forward position at the open end in the furnace and the retracted position at the large diameter part of the inner tube. The steel manufacturing apparatus according to claim 4, which uses a needle tuyere equipped with the apparatus.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59120574A JPS61513A (en) | 1984-06-12 | 1984-06-12 | Manufacture of steel and its apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP59120574A JPS61513A (en) | 1984-06-12 | 1984-06-12 | Manufacture of steel and its apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61513A true JPS61513A (en) | 1986-01-06 |
Family
ID=14789658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP59120574A Pending JPS61513A (en) | 1984-06-12 | 1984-06-12 | Manufacture of steel and its apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61513A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0757109A1 (en) * | 1995-07-24 | 1997-02-05 | Asea Brown Boveri Ag | Smelting aggregate and its use for production of steel in one process step, in particular direct current (DC) arc furnace or oxygen converter |
-
1984
- 1984-06-12 JP JP59120574A patent/JPS61513A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0757109A1 (en) * | 1995-07-24 | 1997-02-05 | Asea Brown Boveri Ag | Smelting aggregate and its use for production of steel in one process step, in particular direct current (DC) arc furnace or oxygen converter |
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