JPS63183117A - Method for controlling amount of soluble al in molten steel - Google Patents
Method for controlling amount of soluble al in molten steelInfo
- Publication number
- JPS63183117A JPS63183117A JP1254687A JP1254687A JPS63183117A JP S63183117 A JPS63183117 A JP S63183117A JP 1254687 A JP1254687 A JP 1254687A JP 1254687 A JP1254687 A JP 1254687A JP S63183117 A JPS63183117 A JP S63183117A
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- slag
- ladle
- amt
- amount
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 41
- 239000010959 steel Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims description 8
- 239000002893 slag Substances 0.000 claims abstract description 27
- 230000003647 oxidation Effects 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- 239000006104 solid solution Substances 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract description 3
- 229910052760 oxygen Inorganic materials 0.000 abstract description 3
- 239000001301 oxygen Substances 0.000 abstract description 3
- 238000007670 refining Methods 0.000 abstract 1
- 238000007796 conventional method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、転炉出鋼後の溶鋼中の固溶Ａｌｆｎの制御
方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for controlling solid solution Alfn in molten steel after being tapped from a converter.
［従来の技術］
転炉から取鍋に出鋼した際、一般に、取鍋内には少量と
はいえ、転炉内のスラグが流出する。[Prior Art] When steel is tapped from a converter into a ladle, slag in the converter generally flows out, albeit in a small amount, into the ladle.
［発明が解決しようとする問題点］
この場合、Ａｌキルド鋼、既脱酸溶鋼においては、この
流出スラグの方が、溶鋼より高い酸素ポテンシャルとな
っている。従って、取鍋内に保持されている間に、溶鋼
中のＡＩは、このスラグにより酸化され、その濃度が低
下する傾向にある。[Problems to be Solved by the Invention] In this case, in the case of Al-killed steel and deoxidized molten steel, this flowing slag has a higher oxygen potential than the molten steel. Therefore, while the molten steel is held in the ladle, the AI in the molten steel is oxidized by this slag, and its concentration tends to decrease.
ところで、溶鋼の脱酸が不十分の場合には、鋳片表面に
ブロー疵が発生するとか、また脱酸過多の場合には、取
鍋ノズル又はタンディシュノズルにノズル詰まりが発生
する等の問題がある。そこで、このようなブロー疵又は
ノズル詰まりが問題となるＭ種においては、溶鋼中の固
溶Ａｌ量を０．００１〜０．００５％の狭い範囲に制御
する必要がある。しかし、取鍋自溶鋼中の固溶Ａｌ口は
、上述のように、スラグの影響を受けて変化するので、
前述の狭範囲に制御することが困難であるという問題が
ある。By the way, if the molten steel is not sufficiently deoxidized, blow defects may occur on the surface of the slab, and if excessive deoxidation is performed, problems such as nozzle clogging may occur in the ladle or tundish nozzle. There is. Therefore, in the M type steel in which such blow defects or nozzle clogging are a problem, it is necessary to control the amount of solid solution Al in the molten steel within a narrow range of 0.001 to 0.005%. However, the solute Al in the ladle self-melting steel changes due to the influence of slag, as mentioned above.
There is a problem in that it is difficult to control within the narrow range mentioned above.
この発明は、上記のような問題点を解消できるようにし
た、固溶Ａ Ｉ Ｍｋの制御方法を提供することを目的
とするものである。゛
［問題点を解決するための手段、作用］この発明の固溶
Ａｌ量の制御方法は、転炉出鋼後の取鍋内溶鋼上のスラ
グに脱酸剤を添加して、スラグによる溶鋼中のアルミニ
ウム成分の酸化を抑制し、溶鋼中の固溶ＡＩＧを制御す
るものである。It is an object of the present invention to provide a method for controlling solid solution AIMk that can solve the above-mentioned problems.゛[Means and effects for solving the problem] The method of controlling the amount of solid solution Al of the present invention is to add a deoxidizing agent to the slag on the molten steel in the ladle after tapping the steel in the converter. This suppresses the oxidation of the aluminum component in the steel and controls the solid solution AIG in the molten steel.
取鍋内に流出したスラグに脱酸剤を添加して、スラグの
酸素ポテンシャルを低下させ、溶鋼中のＡＩの酸化を防
止する。これにより、溶鋼中の固溶Ａｌ量を狭い範囲で
制御することができる。A deoxidizing agent is added to the slag flowing into the ladle to lower the oxygen potential of the slag and prevent the oxidation of AI in the molten steel. Thereby, the amount of solid solution Al in molten steel can be controlled within a narrow range.
［実施例コ
添加すべき脱酸剤の量を、転炉吹錬の終点における鋼中
［０コと、流出したスラグ量によって決定する。転炉吹
錬終了後にサブランスにより溶鋼から採取した試料を分
析して吹止め時の鋼中［０］を求め、スラグ中のＦｅＯ
を推定する。また、スラグ量を、取鍋内の溶鋼上のスラ
グ厚みによって求める。[Example] The amount of deoxidizing agent to be added is determined by the amount of slag in the steel at the end of converter blowing and the amount of slag flowing out. After converter blowing is completed, samples taken from molten steel using a sublance are analyzed to determine the [0] in the steel at the time of blow-stopping, and FeO in the slag is determined.
Estimate. Also, the amount of slag is determined by the thickness of the slag on the molten steel in the ladle.
これらの吹止め鋼中［０］及びスラグ厚みのデータを基
に、取鍋内のスラグ中に添加すべき脱酸剤としてのＡｌ
ｆｕを算出し、この所定量のＡＩをスラグに添加する。Based on these data on the blowstop steel [0] and the slag thickness, Al as a deoxidizer to be added to the slag in the ladle was determined.
fu is calculated and this predetermined amount of AI is added to the slag.
第１表は、吹止め時の溶鋼中の［０１と、これによって
決定されるＡｔ係数（投入されなければならないＡ ｌ
ｍ ／全装入量）との関係を示すものである。第２表
は、スラグ厚（取鍋内に流出したスラグ量）と、そのチ
ャージの吹止め［０コとから決定される添加すべきＡｌ
Ｇを示す。Table 1 shows the [01 in the molten steel at the time of blow-stopping and the At coefficient determined by this (the Al
m /total charging amount). Table 2 shows the amount of Al to be added, which is determined from the slag thickness (the amount of slag that has flowed into the ladle) and the blowstop [0] of the charge.
Indicates G.
第 １ 表（単位： ／（ｇ／Ｔ）第 ２
表（単位： Ｋｉ７／ｅｈ）このようにして求め
た所要量のＡＩをスラグ中に添加して、溶鋼中の固溶Ａ
ｌｆｌを制御した結果を、第１図に示す。一方、脱酸剤
を添加しなかった従来方法による場合の固溶Ａ１のバラ
ツキを、第２図に示す。従来法の平均値は０．００４％
で、バラツキは３σ−０，００４％であり、広い範囲に
バラライでいる。これに対し、本発明法による場合は、
平均値が０．００３％で、バラツキは３σ−０，００２
％で、目標とする０、００１〜０．００５％の狭い範囲
に高精度で制御することができた。Table 1 (Unit: /(g/T) 2nd
Table (Unit: Ki7/eh) By adding the required amount of AI determined in this way to the slag, the solid solution A in the molten steel is
The results of controlling lfl are shown in FIG. On the other hand, FIG. 2 shows the variation in solid solution A1 in the case of the conventional method in which no deoxidizing agent was added. The average value of the conventional method is 0.004%
The variation is 3σ - 0,004%, and it varies over a wide range. On the other hand, in the case of the method of the present invention,
The average value is 0.003% and the variation is 3σ-0,002
%, it was possible to control with high accuracy within the narrow target range of 0.001% to 0.005%.
［発明の効果］
この発明の溶鋼中の固溶Ａｌ量の制御方法は上記のよう
なもので、溶鋼中の固溶Ａ１量を極めて狭い範囲に制御
することができる。[Effects of the Invention] The method for controlling the amount of solid solute Al in molten steel of the present invention is as described above, and the amount of solid solute Al in molten steel can be controlled within an extremely narrow range.
第１図と第２図は、それぞれ本発明法と従来法における
溶鋼中の固溶Ａｌ量のバラツキを示す説明図である。
出願人代理人 弁理士 鈴江武彦
固省ＡＲ量
第１図
固５Ｍ ＡＩ受
第２図FIG. 1 and FIG. 2 are explanatory diagrams showing variations in the amount of solid solution Al in molten steel in the method of the present invention and the conventional method, respectively. Applicant's agent Patent attorney Takehiko Suzue Kosho AR amount Figure 1 Hard 5M AI receiver Figure 2
Claims (1)
、スラグによる溶鋼中のアルミニウム成分の酸化を抑制
し、溶鋼中の固溶Ａｌ量を制御することを特徴とする溶
鋼中の固溶Ａｌ量の制御方法。It is characterized by adding a deoxidizing agent to the slag on the molten steel in the ladle after tapping from the converter to suppress the oxidation of the aluminum component in the molten steel by the slag, and to control the amount of solid solution Al in the molten steel. A method for controlling the amount of solid solution Al in molten steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1254687A JPS63183117A (en) | 1987-01-23 | 1987-01-23 | Method for controlling amount of soluble al in molten steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1254687A JPS63183117A (en) | 1987-01-23 | 1987-01-23 | Method for controlling amount of soluble al in molten steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63183117A true JPS63183117A (en) | 1988-07-28 |
Family
ID=11808328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1254687A Pending JPS63183117A (en) | 1987-01-23 | 1987-01-23 | Method for controlling amount of soluble al in molten steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63183117A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203653A (en) * | 2021-04-07 | 2021-08-03 | 邯郸钢铁集团有限责任公司 | Method for accurately estimating RH molten steel weight and alloy yield |
-
1987
- 1987-01-23 JP JP1254687A patent/JPS63183117A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203653A (en) * | 2021-04-07 | 2021-08-03 | 邯郸钢铁集团有限责任公司 | Method for accurately estimating RH molten steel weight and alloy yield |
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