JPS5819723B2 - Tenrosougiyouhouhou - Google Patents
TenrosougiyouhouhouInfo
- Publication number
- JPS5819723B2 JPS5819723B2 JP48104925A JP10492573A JPS5819723B2 JP S5819723 B2 JPS5819723 B2 JP S5819723B2 JP 48104925 A JP48104925 A JP 48104925A JP 10492573 A JP10492573 A JP 10492573A JP S5819723 B2 JPS5819723 B2 JP S5819723B2
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- blowing
- molten steel
- target
- temperature
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Description
【発明の詳細な説明】 本発明は転炉操業方法に関するものである。[Detailed description of the invention] The present invention relates to a converter operating method.
転炉吹錬溶鋼の成分測定法としてはサーモダイン法、排
ガス分析法の他、サブランス法によるものがある。Methods for measuring the components of converter-blown molten steel include thermodyne method, exhaust gas analysis method, and sublance method.
上記サブランス法としての考え方は吹錬中に溶鋼をサン
プリングし、その時点での鋼中C量を測定し、以降目標
とするC量にするための吹錬時間等を算出するものであ
る。The concept of the above-mentioned sublance method is to sample molten steel during blowing, measure the C content in the steel at that point, and calculate the blowing time etc. to achieve the target C content thereafter.
しかしながらこのような方法では実際操業に適用した場
合満足すべき結果が得られないことが判った。However, it has been found that such a method does not yield satisfactory results when applied to actual operations.
本発明方法は鋼の吹錬に際し、サブランス法による溶鋼
温度及び成分(主としてC及びP、5fj)の正確、迅
速な測定技術を吹錬工程の全体を通じて十分に活用する
ことを前提とするものであって吹止成分等を正確に予測
し、かつ出鋼に際し、鋼成分等を正確に把握して以降の
工程において合金鉄の添加量等を確実に把握し、品質の
向上を計るものであり、その特徴とするところは転炉吹
錬において吹錬中に溶鋼温度と鋼中成分(C,P、S)
を測定し、吹止時の目標成分(c、s、p)にするため
の以降の吹錬吹止までの吹錬条件(吹錬時間と通酸量)
を決定し、これに基づき吹錬し、次いで吹止時に溶鋼温
度と鋼中成分(C20量)を測定することを特徴とする
転炉操業方法にある。The method of the present invention is based on the premise that when blowing steel, accurate and rapid measurement technology of molten steel temperature and composition (mainly C and P, 5fj) by the sublance method is fully utilized throughout the blowing process. This is to accurately predict the blowout components, etc., and to accurately grasp the steel components, etc. during tapping, and to ensure the amount of ferroalloy added in subsequent processes, thereby improving quality. , its characteristics include the temperature of molten steel and the components (C, P, S) in the steel during blowing in converter blowing.
Measure the following blowing conditions at the end of blowing to achieve the target components (c, s, p) at the end of blowing (blowing time and amount of oxidation)
is determined, blowing is performed based on the determined value, and then the temperature of the molten steel and the components in the steel (the amount of C20) are measured at the end of blowing.
鋼の品質に大きく影響する成分としては、よく知られて
いるようにC、Mn 、 S 、 Pがあり、又後工程
の造塊、連続鋳造等に影響のある因子として溶鋼温度が
あり、まず本発明においては上記のととく吹錬中に溶鋼
温度と鋼中C,Mn、S、Pを測定するものであるが、
測定時点としては例えば普通鋼の場合は、吹止前の2〜
6分のところで測定することにより、その結果に基づき
目標とする吹止時の温度、成分にする吹錬時間、通酸量
(吹錬用酸素量)を算出し、これに基づき吹錬し、目標
値に吹止めるものである。As is well known, the components that greatly affect the quality of steel are C, Mn, S, and P, and the temperature of molten steel is a factor that affects the subsequent processes such as ingot making and continuous casting. In the present invention, the molten steel temperature and C, Mn, S, and P in the steel are measured during the above-mentioned blowing process.
For example, in the case of ordinary steel, the measurement time point is 2 to 2 seconds before blow-stopping.
By measuring at 6 minutes, based on the results, the target temperature at the end of blowing, the blowing time for the components, and the amount of oxygen passed (oxygen amount for blowing) are calculated, and blowing is performed based on this. This is to stop the target value.
このような吹錬中の測定は例えはサブランスを用い溶鋼
をサンプリングし、その際温度は即刻測定でき、又Cは
凝固温度で測定でき、Mn、S。Such measurements during blowing can be carried out by sampling the molten steel using a sublance, in which case the temperature can be measured immediately, or C can be measured at the solidification temperature, Mn, S.
Pについてはカントパックにより数十秒で測定すること
ができる。P can be measured in several tens of seconds using a Kantopack.
しかして測温の態様としては例えば目標温度と測温結果
を演算器に導入し、Q=(’r−’r1)xK(但し、
Q:通酸量、T:測温時の溶鋼温度、T1:目標温度、
K:昇温率℃/Nm02)の式で測温時から吹止時まで
の通酸量を算出する。However, as a mode of temperature measurement, for example, the target temperature and the temperature measurement result are introduced into a computing unit, and Q=('r-'r1)xK (however,
Q: Oxidation amount, T: Molten steel temperature during temperature measurement, T1: Target temperature,
The amount of oxygen passing from the time of temperature measurement to the time of blow-off is calculated using the formula K: temperature increase rate (°C/Nm02).
又凝固温度から鋼中C量を測定し測定時から吹止時まで
の通酸量を決定する方法としては、同様に鋼中の測定C
量と目標C値を演算器へ導入し、Q1=(C−01)×
k(但し、Ql:通酸量、C:測温時の溶鋼C量、C1
:目標C量、k:脱炭速度%C/Nm’02)の式で測
定時から吹止時までの通酸量を算出する。In addition, as a method to measure the amount of C in steel from the solidification temperature and determine the amount of oxidation from the time of measurement to the time of blow-off, the method is to measure C in steel in the same way.
Introduce the quantity and target C value to the calculator, Q1=(C-01)×
k (however, Ql: amount of oxygen passed, C: amount of molten steel C at the time of temperature measurement, C1
: Target C amount, k: Decarburization rate %C/Nm'02) Calculate the amount of oxygen passing from the time of measurement to the time of blow-off.
また単位時間当りの通酸量から過酸時間(吹錬時間)を
算出する。Also, the overacid time (blowing time) is calculated from the amount of oxygen passed per unit time.
このことから、
Q=Q、の場合・・・・・・そのま′−Qに従って吹錬
。From this, if Q=Q, blowing continues according to '-Q'.
Q>QIの場合・・・・・・そのま″>Qに従って吹錬
。In the case of Q>QI, blowing continues according to ″>Q.
Q<Qlの場合・・・・・・冷却剤を添加し補正Q1に
従って吹錬。If Q<Ql... Add coolant and blow according to correction Q1.
(補正Q1:冷却剤の脱炭量でQlを補正する。(Correction Q1: Correct Ql by the amount of decarburization of the coolant.
)このようにして吹錬を続行しているうちにカントパッ
ク分析により、P、Sの測定値が判明し、次記のごとき
態様に区別される。) While the blowing continues in this manner, the measured values of P and S are determined by Cantpack analysis, and the following aspects are distinguished.
推定吹止P量≦目標P量 ・・・・・・・・・ (1)
推定吹止P量〉目標P量 ・・・・・・・・・ (2)
推定吹止S量≦目標S量 ・・・・・・・・・ (3)
推定吹止S量〉目標S量 ・・・・・・・・・ (4)
しかして上記(1,) 、 (3)のケースの場合はそ
のま5の状態で吹錬し、(2) 、 (4)のケースに
ついては生石灰、螢石の添加等により脱燐、脱硫を促進
する。Estimated end P amount ≦ Target P amount ・・・・・・・・・ (1)
Estimated blow-off P amount>Target P amount ・・・・・・・・・ (2)
Estimated blow-off S amount ≦ Target S amount ・・・・・・・・・ (3)
Estimated blow-off S amount>Target S amount ・・・・・・・・・ (4)
However, in cases (1,) and (3) above, blowing is carried out as is in the state of 5, and in cases (2) and (4), dephosphorization and desulfurization are performed by adding quicklime and fluorite, etc. Facilitate.
この場合の吹止P、Sの推定モデル式としては、例えば
吹止P推定量−(吹錬中測定P%)−に1×△02吹止
S堆定量=−(吹錬中測定s%) −1<2X△0□但
しに1−説P速度(0,001〜0.0034/Nm0
2 )k2=説S速度(0,001〜0.002 %/
NrrX: 02)△02=吹練中測定時点〜吹止時ま
での通酸量N m”/ T −c h
次に上記生石灰、螢石の添加調整量としては、例えは
生石灰−(吹止推定P量〜目標P量)×ρ1又は(吹止
推定S量−目標S量)×ρ2
螢石帯行吹止推定P量−目標P量)×ρ3又は(吹止推
定S量−目標S量)×ρ4
により算出する。In this case, the model formula for estimating the blowhole P and S is, for example, the estimated blowhole P amount - (P% measured during blowing) - 1 x △02 blowhole S deposition amount = - (s% measured during blowing) ) -1<2X△0□However, 1- theory P speed (0,001~0.0034/Nm0
2) k2 = theory S speed (0,001 to 0.002%/
Nrr Estimated P amount - Target P amount) x ρ1 or (Estimated stop S amount - Target S amount) x ρ2 Estimated stop P amount - Target P amount) x ρ3 or (Estimated stop S amount - Target S Calculated by: (amount) x ρ4.
但し、ρ1〜ρ4はP又はSをo、o1%下げるに必要
な生石灰又は螢石の量である。However, ρ1 to ρ4 are the amounts of quicklime or fluorite necessary to lower P or S by o, o1%.
かくして上記のととく吹錬中の測定時点から吹1にまで
の制御を行ない、吹止めた後出鋼前に次記のごとく溶鋼
をサブランス法にて測定し、その結果に基づき出鋼する
か否か、又出鋼後の工程での合金鉄の添加歩留、出鋼温
度等による諸条件を加味した処理を施し、品質の向上に
寄与させるものであり、極めて重要なことである。In this way, the above-mentioned control is carried out from the measurement point during blowing to blowing 1, and after the blowing is stopped and before tapping, the molten steel is measured by the sublance method as described below, and based on the results, the molten steel is tapped. However, it is extremely important to carry out processing that takes into account various conditions such as the addition yield of ferroalloy and the tapping temperature in the process after tapping, which contributes to improving quality.
すなわち吹止後出鋼前の溶鋼の測定要素としては溶鋼温
度、溶鋼中のC2O量をサブランス法にて測定するもの
である。That is, as measurement elements for the molten steel after blow-stopping and before tapping, the molten steel temperature and the amount of C2O in the molten steel are measured by the sublance method.
つまり溶鋼温度は後工程での鋳込に際し、割れ等を防止
することができ、又鋼中のC量は出鋼後でも加炭し、C
量を調節することができることから、Cの目標吹止量よ
り低くなっても他の要素である溶鋼温度、鋼中P、S等
を目標値に吹止めるための制御を優先させることから、
必要に応じて加炭するか否か等を判断するため測定する
必要があり、又鋼中の酸素量(フリー酸素)はその量に
より後の合金鉄添加に際し、鋼中酸素と反応し、それだ
け歩留が劣ることになり、従って鋼中酸素を正確に把握
していないと合金鉄添加による鋼種の調整等が精密にで
きず、特に特殊鋼等においては成品にならないケースも
ある。In other words, the temperature of the molten steel can be adjusted to prevent cracking during pouring in the subsequent process, and the amount of C in the steel can be reduced by carburization even after tapping.
Since the amount can be adjusted, even if the amount of C is lower than the target blow-off amount, priority is given to controlling other elements such as molten steel temperature, steel P, S, etc. to the target values.
It is necessary to measure the amount of oxygen in the steel to determine whether or not to carburize it if necessary.Also, depending on the amount of oxygen in the steel (free oxygen), it will react with the oxygen in the steel when adding ferroalloy later, and The yield will be poor, and therefore, unless the oxygen in the steel is accurately known, it will not be possible to precisely adjust the steel type by adding ferroalloy, and there are cases in which the finished product will not be produced, especially in special steels.
更にほこの酸素量の測定により鋼中C量を正確に把握す
ることができる。Furthermore, by measuring the amount of oxygen in the steel, the amount of C in the steel can be accurately determined.
すなわち鋼中C量が約o、12fb以上の場合は前記の
ごとく凝固温度により容易にC量を測定することができ
るが、約0.12%以下になると凝固温度では正確に測
定することが困難であり、例えば低炭素鋼の吹錬のごと
く、鋼中C量を約0.12%以下で吹止める場合は、鋼
中酸素量によってC量を推定することにより正確に把握
することができる。In other words, if the C content in steel is about 0.12 fb or more, it can be easily measured by the solidification temperature as described above, but if it is less than about 0.12%, it is difficult to accurately measure it by the solidification temperature. For example, in the case of blowing low carbon steel, when the amount of C in the steel is stopped at about 0.12% or less, the amount of C can be accurately grasped by estimating the amount of C from the amount of oxygen in the steel.
かくすることにより、鋼中P、S等は正確に目標値に吹
止めることができるが、最終的に確認の意味から測定す
ることは有効である。By doing this, P, S, etc. in the steel can be accurately stopped at the target value, but it is effective to measure for final confirmation.
又他成分例えばMn等も制御対象にすることもできる。Further, other components such as Mn can also be controlled.
このような本発明方法を実施するこみにより、次記のと
古き優れた効果が得られる。By carrying out the method of the present invention as described above, the following excellent effects can be obtained.
溶鋼温度、鋼中成分を正確に制御(調節)できるため品
質を飛曜的に向上させることができる。Since the temperature of molten steel and the components in the steel can be accurately controlled (adjusted), quality can be dramatically improved.
又出鋼前の酸素量を正確に把握するこよから合金鉄の添
加量を精密にすることができ、この点からも成品の品質
を著しく向上させることができる等の優れた効果が得ら
れる。Furthermore, by accurately grasping the amount of oxygen before tapping, the amount of ferroalloy added can be made precise, and from this point as well, excellent effects such as the ability to significantly improve the quality of the finished product can be obtained.
次に本発明方法による制御態様の一例を挙げる。Next, an example of a control mode according to the method of the present invention will be described.
図面において測定装置1により吹錬中の溶鋼の温度、C
量を測定し直ちに計算機2へ導入し、他のP、S等は取
出した溶鋼をカントパック分析器3により測定し、同様
に計算機2へ導入し、現在の吹錬条件で目標値の成分に
なるか否かを判断し、吹錬条件の変更を必要とする場合
はそれぞれ図示のごとく調整し、吹止後直ちに測定装置
1′で図示のごとく諸要素を測定し、これに基づき加炭
の必要性等を判断するとともにO量に応じ合金鉄の歩留
を加味した添加量を指示させるものである。In the drawing, the temperature of molten steel during blowing, C, is measured by measuring device 1.
Measure the amount and immediately introduce it into the calculator 2. For other P, S, etc., measure the taken out molten steel with the Cantopack analyzer 3, and similarly introduce it into the calculator 2, and adjust the composition to the target value under the current blowing conditions. If it is necessary to change the blowing conditions, make the necessary adjustments as shown in the figure. Immediately after the blowing stops, measure various elements with the measuring device 1' as shown in the figure. In addition to determining the necessity, etc., the amount to be added is specified in accordance with the amount of O and taking into account the yield of ferroalloy.
次に本発明方法の実施例を図面とともに挙げる。Next, examples of the method of the present invention will be described together with drawings.
250を酸素上吹転炉において
溶銑成分 CMn S P 5iFe係
4.10.60,030.150.4残このような溶
銑210tと副原料としてスケール7t、石灰石2t1
螢石0.5tを装入し普通鋼を次記のごとく吹錬した。210 tons of such hot metal, 7 tons of scale, and 2 tons of limestone as auxiliary raw materials.
0.5t of fluorite was charged and ordinary steel was blown as follows.
(1)過酸速度 70ONぜ7分
(2)過酸圧力 8.5kg/1
(3)酸素吹込ランスと湯面間隔 2000mmこのよ
うな条件で吹+h、 C: 0.08係、P:0.01
%、S:0.02係、温度:1600°Cにするため吹
錬予定酸素量1l100ONと設定し、700 ONm
”過酸後吹錬中の溶鋼をサブランス法にて取り、測定装
置で測定し、C: 0.5% (凝固温度により判定)
、温度:1580℃を計算機へ導入し次いで1分径カン
トパック分析計によりP:0.04係、S:0.021
%の値を測定し、直ちに計算機へ導入し、前記のごとき
計算により、過酸量70ON i/分、過酸圧力8.5
kq/cit、湯面間隔20oO闘、以降吹止迄の過
酸量2100Nm3と算出され、これに基づき上記のご
とく修正し、このま5吹錬すると溶鋼温度が目標値より
高くなるので冷却剤として鉄鉱石2.Otを投入しつつ
吹錬して吹」トめた。(1) Peracid rate: 70 ON for 7 minutes (2) Peracid pressure: 8.5 kg/1 (3) Distance between oxygen blowing lance and hot water level: 2000 mm Blow + h under these conditions, C: 0.08, P: 0 .01
%, S: 0.02 ratio, temperature: In order to achieve 1600°C, the planned oxygen amount for blowing was set to 1l100ON, and 700ONm.
``The molten steel being blown after peracid was taken by the sublance method and measured with a measuring device, and the C: 0.5% (determined by solidification temperature)
, Temperature: 1580°C was introduced into the computer, and then P: 0.04 and S: 0.021 were measured using a 1 minute diameter Cantopack analyzer.
% value, immediately input it into the computer, and calculate as above, the peracid amount is 70ON i/min, the peracid pressure is 8.5
kq/cit, hot water level spacing 20oO, the amount of superoxidation up to the end of blowing is calculated to be 2100Nm3, and based on this, the above correction is made, and since the molten steel temperature will be higher than the target value after the next 5 blowings, it is used as a coolant. Iron ore2. I blew it while adding Ot and it failed.
次いで直ちに溶鋼をサブランス法にて抜取り測定装置1
′で測定し、C:0.06係、p:o、os係、S:0
.0]9係、0:0.05%、Mn : 0.20%、
温度1605℃の測定結果を得、直ちに計算機2へ導入
し、合金鉄(Fe −Mn )を2.21投入すべき指
示が出され、同時にCが目標値より低いため加炭する必
要が生じ、他の条件ははゾ目標値に合っており調整の必
要がなく、従って出鋼中取鍋において上記のごとく、F
e−Mn(合金鉄)を投入し、溶鋼上面に加炭材として
コークス粉を添加し、C量を調整し、所定の鍋脱酸した
後、リムド鋼を造塊した。Then, the molten steel is immediately sampled using the sublance method and measured using the measuring device 1.
', C: 0.06 ratio, p: o, os ratio, S: 0
.. 0] Section 9, 0: 0.05%, Mn: 0.20%,
A measurement result of a temperature of 1605°C was obtained, which was immediately introduced into the computer 2, and instructions were given to introduce 2.21% of ferroalloy (Fe-Mn).At the same time, since C was lower than the target value, it became necessary to carburize. The other conditions meet the target values and there is no need for adjustment, so in the tapping ladle, F
E-Mn (ferroalloy) was introduced, coke powder was added as a carburizer to the upper surface of the molten steel, the amount of C was adjusted, and a predetermined amount of pot deoxidation was performed, followed by ingot formation of rimmed steel.
このように本発明によれば後吹等の吹錬におけるトラブ
ルもなく、成分、温度等を目標値に調整することができ
るものである。As described above, according to the present invention, the components, temperature, etc. can be adjusted to target values without any troubles during blowing such as after-blowing.
図面は本発明方法の制御態様を示すブロック図である。
1・・・・・・測定装置、2・・−・・・計算機、3・
・−・・・分析器(カントバック)。The drawing is a block diagram showing a control aspect of the method of the present invention. 1...Measuring device, 2...-...Calculator, 3.
・-・・・Analyzer (cantback).
Claims (1)
ンス法によりサンプリングして溶鋼温度を測定すると共
に溶鋼の凝固温度でC量を測定しまたカントパックによ
りP、S量を測定し、 (ロ)次いでQ=(’r−’ri)XK(但しQ:通酸
量、T:測温時の溶鋼温度、T、:目標温度、K:昇温
度’C/ N m’−02)の式に基づいて測温時から
吹止時まで通酸量を算出し、 Qつ他方同時にQl−(CC1)X k (但し、Qに
通酸量、C:測温時の溶鋼のC量、C1:目標C量、k
:説炭速度係C/Nraニー0□)の式に基づいて測定
時から吹止時までの通酸量を算出し、(ニ)Q=Qtの
場合はそのままQに従って吹錬し、Q、>Q 1の場合
はそのままQlに従って吹錬し、Q<Qlの場合は冷却
剤を添加して、冷却剤の脱炭量により補正されたQlに
従って吹錬し、(ホ)かくして吹錬続行中にカントバッ
ク分析により得られたP、Sの測定値から推定吹止P、
S量を求め、之を目標P、S量と比較して推定吹止P、
S量が目標P、S量以下の場合にはそのまま吹錬し、推
定吹止P、S量が目標P、S量より大きい場合には生石
灰、帯行を添加して、脱燐、脱硫を促進し、 (へ)かくして吹止め後出鋼前に溶鋼温度、溶鋼中のC
2O量をサブランス法により測定し、C量が目標吹止量
より低い場合には加炭し、またC量にもとづいて合金鉄
添加量を調整することを特徴とする転炉操業方法。[Claims] 1 (4) The molten steel being blown in an oxygen top blowing converter is sampled by the sublance method, the molten steel temperature is measured, the C content is measured at the solidification temperature of the molten steel, and the P, Measure the amount of S, (b) then Q = ('r-'ri) Calculate the amount of oxygen passing from the time of temperature measurement to the time of blow-off based on the formula of N m'-02), and calculate the amount of oxygen passed from the time of temperature measurement to the time of blow-off, and Ql-(CC1) C amount of molten steel at time, C1: Target C amount, k
: Calculate the amount of oxidation from the time of measurement to the end of blowing based on the formula of coal drying speed coefficient C/Nraney 0□), (d) If Q = Qt, blow according to Q as it is, Q, >Q1, blowing is continued according to Ql, and when Q<Ql, coolant is added and blowing is performed according to Ql corrected by the amount of decarburization of the coolant, (e) Blowing is continued. Estimated blow-off P, from the measured values of P and S obtained by cantback analysis.
Find the S amount and compare it with the target P and S amount to determine the estimated stop P,
If the S amount is less than the target P, S amount, blowing is continued, and if the estimated blowout P, S amount is greater than the target P, S amount, quicklime and banding are added to perform dephosphorization and desulfurization. (to) Thus, after blowstopping and before tapping, the temperature of the molten steel and the C in the molten steel decrease.
A converter operating method characterized in that the amount of 2O is measured by a sublance method, and if the amount of C is lower than the target blow-off amount, carburization is performed, and the amount of ferroalloy added is adjusted based on the amount of C.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP48104925A JPS5819723B2 (en) | 1973-09-19 | 1973-09-19 | Tenrosougiyouhouhou |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP48104925A JPS5819723B2 (en) | 1973-09-19 | 1973-09-19 | Tenrosougiyouhouhou |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5056308A JPS5056308A (en) | 1975-05-17 |
JPS5819723B2 true JPS5819723B2 (en) | 1983-04-19 |
Family
ID=14393665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP48104925A Expired JPS5819723B2 (en) | 1973-09-19 | 1973-09-19 | Tenrosougiyouhouhou |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5819723B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6160475A (en) * | 1984-08-18 | 1986-03-28 | 平岡織染株式会社 | Air-permeable containing vessel for odor article |
-
1973
- 1973-09-19 JP JP48104925A patent/JPS5819723B2/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6160475A (en) * | 1984-08-18 | 1986-03-28 | 平岡織染株式会社 | Air-permeable containing vessel for odor article |
Also Published As
Publication number | Publication date |
---|---|
JPS5056308A (en) | 1975-05-17 |
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