JPS6063311A - Manufacture of dead soft steel by rh degassing - Google Patents
Manufacture of dead soft steel by rh degassingInfo
- Publication number
- JPS6063311A JPS6063311A JP17137983A JP17137983A JPS6063311A JP S6063311 A JPS6063311 A JP S6063311A JP 17137983 A JP17137983 A JP 17137983A JP 17137983 A JP17137983 A JP 17137983A JP S6063311 A JPS6063311 A JP S6063311A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- degassing
- inert gas
- furnace
- dead soft
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Abstract
Description
【発明の詳細な説明】
この発明はＲＩ（脱ガスを用いた極低炭素鋼の溶製方法
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing ultra-low carbon steel using RI (degassing).
従来、ＲＩ（脱ガスを用いて極低炭素鋼を溶製する場合
、事前処理として転炉での底吹きガス攪拌や２次精錬設
備により鋼中［（）濃度をＩ Ｑ Ｏｐｐｍ 程既にし
た後、ＲＨ脱炭処理を２０〜３０分行う必要があった。Conventionally, when ultra-low carbon steel is melted using RI (degassing), as a pretreatment, bottom-blown gas stirring in a converter or secondary refining equipment is used to reduce the concentration in the steel to I Q Oppm. , it was necessary to perform RH decarburization treatment for 20 to 30 minutes.
そのためコスト的にもまた大量溶製の観点からも改善が
望まれていた。Therefore, improvements have been desired in terms of cost and mass production.
本発明はこのためになされたもので、事前処理を必要と
せず、しかもＲＨ脱ガス処理時間の短い溶製法を提供し
ようとするものであるＯ
ＲＨ脱ガスにおける脱炭速度は、この脱炭反応を一次反
応とみなすと次のように表わせる。The present invention was made for this purpose, and aims to provide a melting method that does not require pre-treatment and has a short RH degassing time. When considered as a first-order reaction, it can be expressed as follows.
ここで〔Ｃ〕：バルクのＣ０度
［Ｃ］ｉ ： Ｐｃｏ Ｋ平衡する［：Ｃ］ ｅ度Ａ
：反応界面積
したがって脱炭速匿を向上させるためには反応界面積を
増大させることが重要である０この反応界面積を増大さ
せる方法として、浸漬管からのＡｒガス等の環流用不活
性ガス吹込量を増大させ環流量を増大させる方法と、真
空庭の早期向上によＪＣＯ／＜プルの発生を増し反応界
面積の増大を図る方法とが考えら・れる０前者のガス吹
込量と環流量とには、第１図に示すようなモデルを考え
ると、次のような関係があることが知られている。Here [C]: Bulk C0 degree [C]i: Pco K equilibrium [:C] e degree A
: Reaction interfacial area Therefore, it is important to increase the reaction interfacial area in order to improve decarburization speed.0 As a method of increasing this reaction interfacial area, inert gas for reflux such as Ar gas from the immersion pipe is used. Two methods are considered: one is to increase the amount of gas injected to increase the reflux amount, and the other is to increase the generation of JCO/< pull and increase the reaction interfacial area by improving the vacuum chamber early. Considering the model shown in FIG. 1, it is known that the flow rate has the following relationship.
Ｗ＝Ｋ（Ｈ’Ｑ’／’ −Ｄ２）１／２ ・・・・・・
・・・・・・・・・・・・・・・・・・・・・■ここで
Ｗ：環流量（ｔ／ｍ１ｎ）
Ｈ：不活性ガス吹込深さくｍ）
Ｑ：不活性ガス吹込量（Ｎｍ”７ｍ１ｒｉ ）Ｄ＝浸漬
管内径（ｍ）
そして水モデル実験によれば、このＷを最大にするＱが
下記０式に示すように存在し、従来はこれ以上にＱが増
大してもＷはむしろ減少すると考えられていた。W=K(H'Q'/'-D2)1/2...
・・・・・・・・・・・・・・・・・・・・・ ■Where W: Circulation amount (t/m1n) H: Inert gas injection depth (m) Q: Inert gas injection amount (Nm”7m1ri) D=Immersion pipe inner diameter (m) According to the water model experiment, there is a Q that maximizes this W as shown in equation 0 below, and conventionally, even if Q increases beyond this, It was thought that W would actually decrease.
Ｑ＝３．９Ｘ１０−２Ｘ（ＩＯＤ）”・０８ ・・・・
・・・・・・・・・・・■しかし、本発明者らの実験研
究によれば、不活性ガス流量の増大は確実に脱炭速度の
向上をもたらすことが明らかとなった。第２図はその関
係を示すもので、初期Ａｒ流量７０ＯＮｔ／ｍｉｎのも
のはｌｏ ｏ ｏ Ｎｔ／ｍｉｎのものに比べて初期脱
炭速度は速く、また７０ＯＮｔ／ｍｉｎに流量を増した
時点で再び脱炭速度が向上していることがわかる。Q=3.9X10-2X (IOD)"・08...
......■ However, according to the experimental research conducted by the present inventors, it has been revealed that an increase in the inert gas flow rate definitely brings about an improvement in the decarburization rate. Figure 2 shows the relationship.The initial decarburization rate is faster when the initial Ar flow rate is 70ONt/min compared to the lo o o Nt/min, and when the flow rate is increased to 70ONt/min, It can be seen that the decarburization rate has improved.
以上の結果から、本発明においては不活性ガス流量を従
来の上限とされていた値以上、即ち、Ｑ （Ｎｍ３／ｍ
１ｎ） ＞ ３．９ Ｘ １０−２Ｘ （ｌ０Ｄ）２−
”と限定する。From the above results, it is clear that in the present invention, the inert gas flow rate is higher than the conventional upper limit, that is, Q (Nm3/m
1n) > 3.9 X 10-2X (l0D)2-
”.
次に第２図に脱炭速度に及ぼす減圧パターンの影響を示
す。このグラフから減圧パターンを遅くしたものについ
１は初期脱炭速度が遅いことがわかる。また第１図と第
２図よシ初期脱炭速度の向上が到達炭素濃度に影響を及
はしていると推定される。Next, Figure 2 shows the influence of the pressure reduction pattern on the decarburization rate. From this graph, it can be seen that the initial decarburization rate of No. 1 is slow among those with a slow depressurization pattern. Furthermore, as shown in Figures 1 and 2, it is presumed that the improvement in the initial decarburization rate has an effect on the carbon concentration reached.
従って減圧速度になるべく速くすることが望聾しく、本
発明においては減圧速度を７６０ ｔｏｒｒ 〜ｉ ｔ
ｏｒｒまでの平均速度で１２０ｔｏｒｒ／ｍｉｎ 以上
と限定する。Therefore, it is desirable to make the decompression speed as fast as possible, and in the present invention, the decompression speed is set to 760 torr to i t
The average speed up to orr is limited to 120 torr/min or more.
以上のような本発明法によυ、第４図に示す結果か得ら
ルた。この方法により２００〜３００ｐｐｍ の高炭素
濃度域より２０ｐｐｍ以下の低炭素濃度域まで約１５分
で脱炭可能となった。By the method of the present invention as described above, the results shown in FIG. 4 were obtained. By this method, it became possible to decarburize from a high carbon concentration range of 200 to 300 ppm to a low carbon concentration range of 20 ppm or less in about 15 minutes.
第１図はＲＨ脱ガス法のモデル図、第２図は不活性ガス
吹込量と脱炭速度との関係を示スゲラフ、第３図は脱炭
速度と減圧ノくターンの関係を示すグラフ、第４図は本
発明法の結果を示すグラフである。
特許出願人 日本鋼管株式会社
発 明 者 半 明 正 ２
同 安 新 孝 ６
同 １） 辺 治 長
間 池 １） 正 文
代理人弁理士 吉 原 省 三
同 同 高 晧 消
量 弁鏝士 吉 原 弘 子
１１１ 図
第２図
Ｔｉｍｅ （ｍｉｎ）Figure 1 is a model diagram of the RH degassing method, Figure 2 is a graph showing the relationship between inert gas injection amount and decarburization rate, and Figure 3 is a graph showing the relationship between decarburization rate and pressure reduction turn. FIG. 4 is a graph showing the results of the method of the present invention. Patent Applicant Nippon Kokan Co., Ltd. Inventor Masaaki Han 2 Takashi Yasu Arata 6 1) Osamu Be, Ike Nagama 1) Masafumi Patent Attorney Sho Yoshihara Sando Do Takashi Akira Mitsuru Benshiro Yoshihara Hiroko 111 Figure 2 Time (min)
Claims (1)
での平均速度で１２０ ｔｏｒｒ／ｍｉｎ 以上とし、
環流用不活性ガス吹込量Ｑ （Ｎｍ”／ｍｉｎ ）を、
Ｑ≧３．９ Ｘ １０−” Ｘ （１０Ｄ ）”ｌ”と
することを特徴とするＲＨ脱ガスを用いた極低炭素鋼の
溶製方法。The decompression speed is 760 torr = 1 torr”!
The average speed shall be 120 torr/min or more,
The amount of inert gas blown for reflux Q (Nm”/min) is
A method for producing ultra-low carbon steel using RH degassing, characterized in that Q≧3.9 X 10-"X (10D)"l".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17137983A JPS6063311A (en) | 1983-09-19 | 1983-09-19 | Manufacture of dead soft steel by rh degassing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17137983A JPS6063311A (en) | 1983-09-19 | 1983-09-19 | Manufacture of dead soft steel by rh degassing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6063311A true JPS6063311A (en) | 1985-04-11 |
Family
ID=15922082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17137983A Pending JPS6063311A (en) | 1983-09-19 | 1983-09-19 | Manufacture of dead soft steel by rh degassing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6063311A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04176812A (en) * | 1990-11-08 | 1992-06-24 | Kawasaki Steel Corp | Method for refining ultra low carbon steel |
| CN112011670A (en) * | 2020-08-20 | 2020-12-01 | 邯郸钢铁集团有限责任公司 | Method for increasing RH refining decarburization rate of ultra-low carbon steel and side blowing device |
| CN117230281A (en) * | 2023-11-14 | 2023-12-15 | 山西同航特钢有限公司 | Production process of high-phosphorus IF steel |
-
1983
- 1983-09-19 JP JP17137983A patent/JPS6063311A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04176812A (en) * | 1990-11-08 | 1992-06-24 | Kawasaki Steel Corp | Method for refining ultra low carbon steel |
| CN112011670A (en) * | 2020-08-20 | 2020-12-01 | 邯郸钢铁集团有限责任公司 | Method for increasing RH refining decarburization rate of ultra-low carbon steel and side blowing device |
| CN117230281A (en) * | 2023-11-14 | 2023-12-15 | 山西同航特钢有限公司 | Production process of high-phosphorus IF steel |
| CN117230281B (en) * | 2023-11-14 | 2024-01-23 | 山西同航特钢有限公司 | Production process of high-phosphorus IF steel |
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