JPH068451B2 - Converter molten steel carbon estimation method - Google Patents
Converter molten steel carbon estimation methodInfo
- Publication number
- JPH068451B2 JPH068451B2 JP63207814A JP20781488A JPH068451B2 JP H068451 B2 JPH068451 B2 JP H068451B2 JP 63207814 A JP63207814 A JP 63207814A JP 20781488 A JP20781488 A JP 20781488A JP H068451 B2 JPH068451 B2 JP H068451B2
- Authority
- JP
- Japan
- Prior art keywords
- molten steel
- amount
- carbon
- estimated
- temperature
- 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.)
- Expired - Fee Related
Links
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は脱燐溶銑を用いた転炉精錬中に、溶鋼の炭素量
を推定する方法に関するものである。The present invention relates to a method for estimating the carbon content of molten steel during converter refining using dephosphorized hot metal.
［従来の技術］ 酸素ランスに平行に設けられたサブランスに消耗型の測
定用センサーをとりつけて凝固固温度ＴSを測定する。
ＴSと溶鋼中の炭素量［Ｃ］との関係式、 ［Ｃ］＝ａＴS＋ｂ(a,bは定数) ……(A) から［Ｃ］を求める。[Prior Art] A consumable measuring sensor is attached to a sublance provided in parallel with an oxygen lance to measure the solidification solid temperature T S.
[C] is obtained from the relational expression between T S and the amount of carbon [C] in molten steel, [C] = aT S + b (a and b are constants) (A).
［発明が解決しようとする課題］ しかしながら、上記(A)式は溶鋼中のＭｎ量が０．５wt
％以下の低い場合に適用されるものである。ところが、
脱燐溶銑を用いた転炉精練では、Ｍｎ鉱石の炉内直接還
元により、溶鋼中のＭｎ量が高く、０．５wt％乃至１．
５wt％程度となっている。したがって、上記(A)式を適
用すると、溶鋼中のＭｎ量の影響が考慮されていないの
で、求められた溶鋼炭素量の精度が不十分であるという
問題があった。[Problems to be Solved by the Invention] However, in the above formula (A), the amount of Mn in the molten steel is 0.5 wt.
It is applied when the value is lower than%. However,
In converter refining using dephosphorized hot metal, the amount of Mn in the molten steel is high, 0.5 wt% to 1.
It is about 5 wt%. Therefore, when the above formula (A) is applied, the influence of the amount of Mn in the molten steel is not taken into consideration, and there is a problem that the accuracy of the amount of molten steel carbon obtained is insufficient.
本発明はかかる事情に鑑みてなされたもので、溶鋼中の
Ｍｎ量を考慮した精度の高い転炉溶鋼炭素推定方法を提
供しようとするものである。The present invention has been made in view of such circumstances, and an object thereof is to provide a highly accurate converter molten steel carbon estimation method in consideration of the amount of Mn in molten steel.
［課題を解決するための手段、］ 本発明による転炉溶鋼炭素推定方法は、脱燐溶銑を用い
た転炉精錬中に、溶鋼の炭素量を推定する方法におい
て、 (1)溶鋼を採取してその温度および凝固温度を測定する
こと、 (2)前記凝固温度から溶鋼中の１次推定炭素量を求める
こと、 (3)前記１次推定炭素量および前記溶鋼温度を用いて、
転炉内のＭｎの平衡式と、マスバランスの式から溶鋼中
の推定Ｍｎ量を求めること、 (4)前記凝固温度および前記推定Ｍｎ量を用いて炭素量
を求めること、 を含むことを特徴とする。[Means for Solving the Problem] A converter molten steel carbon estimation method according to the present invention is a method for estimating the carbon content of molten steel during converter smelting using dephosphorized hot metal. Measuring its temperature and solidification temperature, (2) obtaining a primary estimated carbon amount in the molten steel from the solidification temperature, (3) using the primary estimated carbon amount and the molten steel temperature,
A Mn equilibrium equation in the converter and obtaining an estimated Mn amount in molten steel from a mass balance equation; (4) obtaining a carbon amount using the solidification temperature and the estimated Mn amount. And
［作用］ 本方法によればＭｎの推定値ではあるが、炭素量を推定
するための一つの要素として考慮されているので、従来
法に比して精度の高い炭素量の推定が可能である。[Operation] According to the present method, although it is an estimated value of Mn, it is considered as one factor for estimating the carbon amount, so that the carbon amount can be estimated more accurately than the conventional method. .
［実施例］ 酸素ランスに平行に設けられたサブランスに消耗型の測
定用センサーをとりつけて溶鋼の温度Ｔと凝固固温度Ｔ
Sを測定する。ＴSと溶鋼中の炭素量［Ｃ］との関係式、 ［Ｃ］＝ａＴS＋ｂ（a,bは定数） ……(1) から１次推定炭素量[Ｃ]1をもとめる。[Example] A consumable measuring sensor was attached to a sublance provided in parallel with an oxygen lance, and the temperature T of the molten steel and the solidification temperature T were set.
Measure S. The primary estimated carbon amount [C] 1 is obtained from the relational expression between T S and the carbon amount [C] in molten steel, [C] = aT S + b (a and b are constants) (1).
一方、Ｍｎ平衡式およびＭｎのマスバランス式はそれぞ
れ以下の(2)，(3)式で表わされる。On the other hand, the Mn balance equation and the Mn mass balance equation are expressed by the following equations (2) and (3), respectively.
log{(Mn)/[Mn]}＝log(A/[C])＋B/T＋Ｃ……(2) WM[Mn]＋WS(Mn)＝WP[Mn]P＋δMO ……(3) ただし、Ｔは溶鋼温度、 [Mn],(Mn),[Mn]Pはそれぞれ溶鋼、スラグ、溶銑中のMn
量、 WM，WS，WP，WOはそれぞれ溶鋼、スラグ、溶銑、Mn鉱石
の重量、 δはMn鉱石中のMn量、A,B,Cは定数、である。log {(Mn) / [Mn]} ＝ log (A / [C]) ＋ B / T ＋ C …… (2) W M [Mn] ＋ W S (Mn) ＝ W P [Mn] P ＋ δM O …… (3 ) where, T is the molten steel temperature, [Mn], (Mn) , [Mn] P respectively molten steel, slag, M n in the hot metal
Amounts, W M , W S , W P , and W O are the weights of molten steel, slag, hot metal, and M n ore, δ is the amount of M n in M n ore, and A, B and C are constants.
(2)，(3)式から(Mn)を消去して得られる[Mn]に関する非
線形方程式を[C]＝[C]1として数値解法により解く。こ
こで得られた推定Ｍｎ量を[Mn]1と書く。The nonlinear equation for [Mn] obtained by eliminating (Mn) from Eqs. (2) and (3) is solved by the numerical method with [C] = [C] 1 . The estimated Mn amount obtained here is written as [Mn] 1 .
上記[Mn]P,WM,WP,WOは通常の操業の中で測定しているも
ので、実測値である。WSは精錬中に投入された副原料の
量と前チャージのスラグ成分から計算によって求める。The above [Mn] P , W M , W P , W O are measured during normal operation and are actually measured values. W S is calculated from the amount of auxiliary raw material input during refining and the slag component of the precharge.
溶鋼中の炭素量[C]は実用的な精度でＴSと[Mn]との一次
式として、 ［Ｃ］＝ＤＴS＋Ｅ［Ｍｎ］＋Ｆ ……(4) で表される。The amount of carbon [C] in the molten steel is expressed as [C] = DT S + E [Mn] + F (4) as a linear expression of T S and [Mn] with practical accuracy.
ここに、Ｄ，Ｅ，Ｆは採取された溶鋼の試料の分析値か
ら重回帰分析により前もって求められた定数である。Here, D, E, and F are constants obtained in advance by multiple regression analysis from the analytical values of the collected molten steel samples.
ここで求められた定数Ｄ，Ｅ，Ｆおよび上記[Mn]1を上
記(4)式に入れて溶鋼中の炭素量［Ｃ］をもとめる。The constants D, E, F obtained here and the above [Mn] 1 are put into the above equation (4) to determine the carbon content [C] in the molten steel.
かくして、［Ｍｎ］を考慮した精度の高い溶鋼中の炭素
量［Ｃ］を求めることができる。Thus, the carbon amount [C] in the molten steel can be obtained with high accuracy in consideration of [Mn].
ついで、本実施例による具体的な数値を挙げて説明す
る。Next, specific numerical values according to this embodiment will be described.
前述の(2)，(3)式から得られる［Ｍｎ］に関する非線形
方程式に含まれる定数に、 [Mn]P＝0.16％，WM＝310T，WS＝3T， WP＝300T，WO＝6.3T，δ＝0.55，A＝-0.170， B＝15.08，C＝10867.9 の値を用いて[Mn]を求め、[Mn]＝1.34％を得た。また、
(4)式の定数、Ｄ，Ｅ，Ｆを重回帰分析により得られた
値は、 Ｄ＝0.011516，Ｅ＝-0.0528，Ｆ＝17.69である。この値
を用いて、(4)式により[C]＝0.147を得た。比較のた
め、同じ試料を発光分光分析装置により分析した値は
[C]＝0.145であった。The constants included in the nonlinear equation for [Mn] obtained from the above equations (2) and (3) include [Mn] P = 0.16%, W M = 310T, W S = 3T, W P = 300T, W O = 6.3T, δ = 0.55, A = -0.170, B = 15.08, C = 10867.9 was used to obtain [Mn], and [Mn] = 1.34% was obtained. Also,
The values obtained by multiple regression analysis of the constants, D, E, and F in the equation (4) are D = 0.011516, E = -0.0528, and F = 17.69. Using this value, [C] = 0.147 was obtained from equation (4). For comparison, the value of the same sample analyzed by an optical emission spectrometer is
[C] = 0.145.
次に、多数の分析値と推定値について、本実施例と従来
例の比較を次に説明する。第１図は、横軸に本実施例に
よる推定炭素量、縦軸に前記発光分光分析による炭素量
をとって両者の関係を示したグラフである。第２図は比
較のため、従来例について第１図と同じグラフを描いて
示したものである。第１図，第２図によれば、分析値と
推定値の差の平均ｘ、および偏差σは本実施例ではそれ
ぞれ0.001％，0.008％、従来例ではこれが0.011％，0.0
25％であって、本実施例により求められる溶鋼炭素量は
従来例と比較して精度が著しく向上されている。Next, a comparison between the present embodiment and the conventional example regarding a large number of analysis values and estimated values will be described. FIG. 1 is a graph showing the relationship between the two, with the horizontal axis representing the estimated carbon content according to this example and the vertical axis representing the carbon content determined by the emission spectroscopy. For comparison, FIG. 2 shows the same graph as in FIG. 1 for the conventional example. According to FIGS. 1 and 2, the average x of the difference between the analysis value and the estimated value and the deviation σ are 0.001% and 0.008% in the present embodiment, respectively, and 0.011% and 0.0 in the conventional example.
It is 25%, and the accuracy of the molten steel carbon amount obtained in this example is remarkably improved as compared with the conventional example.
［発明の効果］ 本発明によれば、転炉内におけるＭｎの平衡式およびマ
スバランスの式から求められる溶鋼中のＭｎ量を考慮し
て溶鋼中の炭素量を求めるので、推定精度が顕著に向上
する。EFFECTS OF THE INVENTION According to the present invention, the amount of carbon in molten steel is obtained in consideration of the amount of Mn in molten steel obtained from the equilibrium formula of Mn in the converter and the equation of mass balance. improves.
第１図は本実施例による溶鋼中の推定炭素量と分析値を
比較したグラフ図、第２図は従来例による溶鋼中の推定
炭素量と分析値を比較したグラフ図である。FIG. 1 is a graph diagram comparing the estimated carbon amount in the molten steel according to the present example with the analysis value, and FIG. 2 is a graph diagram comparing the estimated carbon amount in the molten steel according to the conventional example with the analysis value.
Claims (1)
素量を推定する方法において、 (1)溶鋼を採取してその温度および凝固温度を測定する
こと、 (2)前記凝固温度から溶鋼中の１次推定炭素量を求める
こと、 (3)前記１次推定炭素量および前記溶鋼温度を用いて、
転炉内のＭｎの平衡式と、マスバランスの式から溶鋼中
の推定Ｍｎ量を求めること、 (4)前記１次推定炭素量および前記推定Ｍｎ量を用いて
炭素量を求めること、 を含む転炉溶綱炭素推定方法。1. A method for estimating the carbon content of molten steel during converter refining using dephosphorized hot metal, comprising: (1) collecting molten steel and measuring its temperature and solidification temperature; (2) the solidification Obtaining the primary estimated carbon amount in the molten steel from the temperature, (3) using the primary estimated carbon amount and the molten steel temperature,
Calculating the estimated Mn amount in the molten steel from the equilibrium equation of Mn in the converter and the equation of mass balance; (4) determining the carbon amount using the primary estimated carbon amount and the estimated Mn amount. Converter molten steel carbon estimation method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63207814A JPH068451B2 (en) | 1988-08-22 | 1988-08-22 | Converter molten steel carbon estimation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63207814A JPH068451B2 (en) | 1988-08-22 | 1988-08-22 | Converter molten steel carbon estimation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0257629A JPH0257629A (en) | 1990-02-27 |
| JPH068451B2 true JPH068451B2 (en) | 1994-02-02 |
Family
ID=16545948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63207814A Expired - Fee Related JPH068451B2 (en) | 1988-08-22 | 1988-08-22 | Converter molten steel carbon estimation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH068451B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101977361B1 (en) * | 2017-07-24 | 2019-05-10 | 주식회사 포스코 | A refining method for molten steel |
-
1988
- 1988-08-22 JP JP63207814A patent/JPH068451B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0257629A (en) | 1990-02-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |