JPH0433756A - Method for continuously casting different steel kinds - Google Patents
Method for continuously casting different steel kindsInfo
- Publication number
- JPH0433756A JPH0433756A JP14294490A JP14294490A JPH0433756A JP H0433756 A JPH0433756 A JP H0433756A JP 14294490 A JP14294490 A JP 14294490A JP 14294490 A JP14294490 A JP 14294490A JP H0433756 A JPH0433756 A JP H0433756A
- Authority
- JP
- Japan
- Prior art keywords
- length
- molten steel
- component
- cutting
- charge
- 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 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005266 casting Methods 0.000 title abstract description 11
- 239000002436 steel type Substances 0.000 claims description 12
- 238000009749 continuous casting Methods 0.000 claims description 10
- 238000004088 simulation Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 238000007865 diluting Methods 0.000 abstract 1
- 238000004458 analytical method Methods 0.000 description 7
- 238000005520 cutting process Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 230000005587 bubbling Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000000275 quality assurance Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Landscapes
- Continuous Casting (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、同一タンディツシュを連続使用して異鋼種
を連続鋳造する方法において、前チャージ溶鋼と後チャ
ージ溶鋼との混合部の鋳片切捨て長さ（クロップ長）を
可及的に短くし鋳片の鋳込歩留を向上させる異鋼種の連
続鋳造方法に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for continuously casting different steel types by continuously using the same tundish. The present invention relates to a method for continuous casting of different steel types, which improves the casting yield of slabs by shortening the crop length as much as possible.
従来の技術
同一タンディツシュを連続使用して異鋼種の連続鋳造を
行う場合、タンディツシュ内で不可避的に生じる前チャ
ージ溶鋼と後チャージ溶鋼の混合部は、前・後どちらの
鋼種範囲にも入らなし）ためクロップとして切断しなけ
ればならず、鋳片の歩留低下を余儀なくされる。Conventional technology: When continuous casting of different steel types is performed using the same tundish, the mixing part of the front charge molten steel and the back charge molten steel that inevitably occurs in the tundish does not fall within the range of either the front or rear steel types.) Therefore, it has to be cut into crops, which inevitably lowers the yield of slabs.
かかる対策として、従来様々の異鋼種の連続鋳造方法が
提案されている。As a countermeasure against this problem, continuous casting methods for various types of steel have been proposed.
例えば、タンディツシュ内溶鋼表面に浮遊しているスラ
グを除去して鋳型内へのスラグ流出を防止し、しかる後
に前チャージ溶鋼を鋳型内に全量注入し、タンディツシ
ュ内の前チャージ溶鋼を完全に排出してから後チャージ
溶鋼を取鍋からタンディツシュに注入して鋳込を再開す
る方法がある（特開昭５７−１７７８６５号公報参照）
。For example, the slag floating on the surface of the molten steel in the tundish is removed to prevent the slag from flowing into the mold, and then the entire amount of pre-charged molten steel is injected into the mold, and the pre-charged molten steel in the tundish is completely discharged. There is a method of restarting casting by injecting post-charged molten steel from the ladle into the tundish (see Japanese Patent Laid-Open No. 177865/1986).
.
しかしながら、この方法はタンディツシュ内のスラグ除
去に多大な設備を要するばかりでなく、完全にスラグが
除去できなかった場合にはこの方法を適用することが困
難となるため、一般にはりンディッシュ内前チャージ残
溶鋼量を最小限とし、後チャージ溶鋼を取鍋から注入す
ることにより、混合部の切捨て量を最小とする方法がと
られている。However, this method not only requires a large amount of equipment to remove the slag inside the tundish, but also makes it difficult to apply this method if the slag cannot be completely removed. A method is used to minimize the amount of cut-off in the mixing section by minimizing the amount of residual molten steel and injecting post-charge molten steel from a ladle.
この前チャージ残溶鋼量を最小限とする方法としては、
例えば特開昭６１−７４７６２号公報に開示されている
ように、タンディツシュ底部のノズル部からガスバブリ
ングを行い、残溶鋼の凝固閉塞を防止しなからスラグと
残溶鋼を完全に分離する方法が知られている。The method to minimize the amount of molten steel remaining in the pre-charge is as follows:
For example, as disclosed in Japanese Unexamined Patent Publication No. 61-74762, a method is known in which gas bubbling is performed from a nozzle at the bottom of a tundish to completely separate slag and residual molten steel without preventing solidification and clogging of the residual molten steel. It is being
発明が解決しようとする課題
しかし、前記した前チャージ残溶鋼量を最／Ｊ）限とす
る方法は、混合部の鋳片切捨て量を最小とする方法とし
て有効ではあるが、次に記載するような問題点がある。Problems to be Solved by the Invention However, although the method of minimizing the amount of pre-charge residual molten steel described above is effective as a method of minimizing the amount of cast slabs cut off in the mixing section, as described below, There are some problems.
すなわち、前・後チャージ溶鋼の混合量を決定すること
が困難であり、仮に経験により混合量の決定が可能であ
るとしても、前チャージの残溶鋼量は一定ではないこと
、また重量測定法によってもタンディツシュ内にはスラ
グが存在するため、前チャージ残溶鋼量を正確に知るこ
とは困難であることから、混合部クロップとして切捨て
るべき鋳片長さを正確に決定することが困難であり、実
際には必要最小限以上の長さを混合部鋳片として切捨て
なければならず、歩留の低下を余儀なくされていた。In other words, it is difficult to determine the mixing amount of pre- and post-charge molten steel, and even if it were possible to determine the mixing amount by experience, the amount of remaining molten steel from the pre-charge is not constant, and it is difficult to determine the amount of molten steel mixed by the gravimetric method. However, since there is slag in the tundish, it is difficult to accurately know the amount of molten steel remaining in the pre-charge. In order to do this, it was necessary to cut off a length longer than the minimum required length as a mixed section slab, which inevitably resulted in a decrease in yield.
この発明はこのような実情よりみて、混合部クロップと
して切捨てるべき鋳片長を正確に決定し、その長さを最
少限とすることにより、また操業者ごとの経験による差
異をなくし標準化することにより、さらにオンラインに
て切捨て長さを決定することにより、異鋼種連続鋳造鋳
片の鋳込歩留の向上をはかる異鋼種連続鋳造方法を提案
しようとするものである。In view of these circumstances, this invention accurately determines the length of the slab to be cut off as a crop in the mixing section, minimizes the length, and eliminates differences due to the experience of each operator and standardizes the length. Furthermore, this paper attempts to propose a continuous casting method for different steel types that improves the casting yield of continuously cast slabs of different steel types by determining the cut-off length online.
課題を解決するための手段
この発明は、同一タンディツシュを連続して使用し、当
該タンディツシュ内の前チャージ残溶鋼を一定高さ以下
とした後、後チャージ溶鋼を注入する異鋼種の連続鋳造
方法において、タンディツシュ内の前チャージ残溶鋼と
後チャージ溶鋼とを攪拌混合し、当該混合溶鋼成分と後
チャージ溶鋼成分とから鋳片の混合部切捨て長さを決定
することを要旨とするものである。Means for Solving the Problems This invention provides a method for continuous casting of different steel types, in which the same tundish is continuously used, and after the pre-charge residual molten steel in the tundish is lowered to a certain height or less, post-charge molten steel is injected. The gist of this method is to stir and mix pre-charge residual molten steel and post-charge molten steel in a tundish, and determine the cutting length of the mixed portion of the slab from the mixed molten steel component and the post-charge molten steel component.
作 用
タンディツシュ内に後チャージ溶鋼を注入した後に行う
攪拌方法としては、例えばタンディツシュ底部からのガ
スバブリングを採用することができる。As a stirring method performed after injecting the post-charge molten steel into the tundish, for example, gas bubbling from the bottom of the tundish can be employed.
タンディツシュ内溶鋼の攪拌時間は、ガスバブリングに
よる攪拌の場合、２分間以上が好ましい。In the case of stirring by gas bubbling, the stirring time of the molten steel in the tundish is preferably 2 minutes or more.
これは、前チャージの残溶鋼が後チャージ溶鋼によって
十分に稀釈され、タンディツシュ内混合溶鋼成分の分析
値および決定切捨て長さの正確さを高め、混合部鋳片切
捨て長さを最小とするためである。This is to ensure that the remaining molten steel from the pre-charge is sufficiently diluted by the molten steel after the post-charge, increasing the accuracy of the analytical value of the mixed molten steel composition in the tundish and the determined cut-off length, and minimizing the cut-off length of the slab in the mixing section. be.
混合部鋳片切捨て長さを決定する方法としては、以下の
方法を採用することができる。The following method can be adopted as a method for determining the cutting length of the slab in the mixing section.
■ シミュレーションモデルにより、後チャージの各鋳
込長かにおける成分値を計算し、後チャージの成分分析
値と一致する長さを求める。■ Calculate the component values at each casting length of the post-charge using a simulation model, and find the length that matches the component analysis value of the post-charge.
■ 混合部溶鋼成分、後チャージ溶鋼成分およびその成
分差から予めシミュレーションモデルによる計算あるい
は経験則により後チャージの成分値と一致する鋳片長を
求めておき、鋳片切捨て長さを決定する換算表を作成す
る。■ From the molten steel composition of the mixing part, the post-charge molten steel composition, and their composition differences, calculate in advance a slab length that matches the composition value of the post-charge by calculation using a simulation model or empirical rules, and then create a conversion table to determine the cut-off length of the slab. create.
実際の異鋼種の連続鋳造時には、タンディツシュ内温合
部成分と後チャージ成分分析結果から前記■、■いずれ
かの方法により混合部切捨て鋳片長を溶鋼中各成分につ
いて決定し、その中で最大長さを実際の鋳片切捨て長さ
とする。During actual continuous casting of different steel types, the length of the slab to be cut off at the mixed section is determined for each component in the molten steel using either of the above methods (■) or (■) based on the analysis results of the heated zone inside the tundish and the post-charge components, and the length of the slab for each component in the molten steel is determined. is the actual cut-off length of the slab.
第１図は後チャージ鋳片各位置での混合部の稀釈効果を
示す概念図である。この図より、混合部の成分は順次稀
釈されていくことがわかり、溶鋼内いずれの成分につい
ても後チャージ成分と一致する位置が存在する。各々の
成分について求まるこの位置の内最大のものを混合部ク
ロップの切断位置とすることにより、最／Ｊ・切断長（
鋳片切捨て長）が決定できる。FIG. 1 is a conceptual diagram showing the dilution effect of the mixing section at each position of the post-charge slab. From this figure, it can be seen that the components in the mixing part are diluted sequentially, and there is a position where any component in the molten steel matches the post-charge component. By setting the maximum of these positions determined for each component as the cutting position of the mixing section crop, the maximum /J・cutting length (
The cutting length of slab can be determined.
この発明では、稀釈後のタンディツシュ内混合部のサン
プルを採取し成分分析を行うため、前記したごとく後チ
ャージ成分により近くしかも正確な成分の情報が得られ
ることになり、その結果混合部切捨て鋳片長を短縮でき
るのである。In this invention, a sample of the mixing section in the tundish after dilution is taken and the components are analyzed, so as mentioned above, it is possible to obtain information on the components that are closer and more accurate to the after-charge components, and as a result, the length of the cut slab in the mixing section is can be shortened.
なお、混合部の成分分析値が後チャージ成分と同一の場
合は、鋳片の切捨てを実施する必要がなくなるが、品質
保証の観点から最／Ｆ切捨て長さを定めておくことが望
ましい。Note that if the component analysis value of the mixing section is the same as the post-charge component, there is no need to cut off the slab, but from the viewpoint of quality assurance, it is desirable to determine the minimum /F cutoff length.
実際の操業では、決定された最小切断長をプロセスコン
ピュータに指示し、混合部クロップを自動的に切断する
。これにより、混合部クロップ長さが必要膜／Ｊ）限と
なり、鋳片歩留の向上がはかられる。In actual operation, the determined minimum cutting length is instructed to the process computer and the mixing section crop is automatically cut. As a result, the crop length of the mixing section becomes the required film/J) limit, and the slab yield is improved.
実 施 例
実機にこの発明法を適用し、第１表に示す操業条件で異
鋼種の連続鋳造を実施した時の混合部クロップ切捨て長
さの決定例を第２表に示す。Example Table 2 shows an example of determining the crop cut length of the mixing section when the method of the invention was applied to an actual machine and continuous casting of different steel types was carried out under the operating conditions shown in Table 1.
本実施例では、前記■の方法すなわちシミュレーション
モデルにより、後チャージの各鋳込長さにおける成分値
を計算し、後チャージの成分分析値と一致する長さを求
める方法により、クロップ切捨て長さを決定し７′：ｏ
この場合、溶鋼内クロムの決定切捨て長が最大となる
ため、実際の混合部切捨て長さは １．６ｍ となる。In this example, the crop truncation length is calculated by calculating the component value at each casting length of the post-charge using the method (2), that is, the simulation model, and finding the length that matches the component analysis value of the post-charge. Decided 7':o
In this case, the determined cut-off length of chromium in the molten steel is the maximum, so the actual cut-off length of the mixing section is 1.6 m.
また、この時の切捨て部の分析値は、後チャージの規格
を満足しているだけでなく後チャージの分析値とも一致
している。Further, the analysis value of the truncated portion at this time not only satisfies the post-charge standard but also matches the post-charge analysis value.
また、第２図には本発明法を適用した場合の混合部クロ
ップ長さと従来法によるクロップ長さを比較して示す。Further, FIG. 2 shows a comparison between the crop length of the mixing section when the method of the present invention is applied and the crop length according to the conventional method.
第２図より明らかなごとく、従来法におけるクロップ長
さの平均が１．４８ｍであるのに対して、本発明法では
１．０４ｍと３０％のクロップ長短縮効果が得られた
。As is clear from FIG. 2, the average crop length in the conventional method was 1.48 m, whereas in the method of the present invention, the average crop length was 1.04 m, which was a 30% shortening effect.
第 １ 表
第 ２ 表
発明の効果
この発明は上記のごとく、異鋼種の連続鋳造時にタンデ
ィツシュ内の前チャージの残溶鋼を後チャージの溶鋼に
より十分に稀釈した混合部の溶鋼サンプルを採取し、そ
の分析値により混合部鋳片切捨て長さを決定するので、
新たな設備を必要とすることなくかつ品質保証をはかり
つつ最小限の切捨て長さを正確に決定することが可能と
なる。Table 1 Table 2 Effects of the Invention As described above, this invention collects a molten steel sample from the mixed area where the residual molten steel from the previous charge in the tundish is sufficiently diluted with the molten steel from the subsequent charge during continuous casting of different steel types. The cutting length of the mixing section slab is determined based on the analysis value, so
It becomes possible to accurately determine the minimum cutoff length without requiring new equipment and while ensuring quality.
したがって、この発明方法によれば、鋳片切捨て量を大
幅に減少でき、鋳片鋳込み歩留を確実に向上させること
が可能となる。さらに、一連の肯定をオンラインにて実
施することにより、作業の軽減と、切捨て長さの標準化
による品質保証の確実性がはかられる。Therefore, according to the method of the present invention, the amount of slabs to be discarded can be significantly reduced, and the slab casting yield can be reliably improved. Furthermore, by performing a series of affirmations online, it is possible to reduce work and ensure quality assurance by standardizing the cut length.
【図面の簡単な説明】
第１図はこの発明における混合部クロップ切捨長決定の
概念図を従来法と比較して示したもので、後チャージ鋳
片各位置での混合部の稀釈効果を示す図、第２図はこの
発明の実施例におけるクロップ切捨て量を従来法と比較
して示す図である。
第１図
第２因
混合部クロップ切捨長（ｍ）[Brief Description of the Drawings] Figure 1 shows a conceptual diagram of the mixing section crop cut length determination in this invention in comparison with the conventional method, and shows the dilution effect of the mixing section at each position of the post-charging slab. The figure shown in FIG. 2 is a diagram showing the crop truncation amount in the embodiment of the present invention in comparison with the conventional method. Figure 1: 2nd factor Mixing section crop truncation length (m)
Claims (1)
ッシュ内の前チャージ残溶鋼を一定高さ以下とした後、
後チャージ溶鋼を注入する異鋼種の連続鋳造方法におい
て、タンディッシュ内の前チャージ残溶鋼と後チャージ
溶鋼とを攪拌混合し、当該混合溶鋼成分と後チャージ溶
鋼成分とから鋳片の混合部切捨て長さを決定することを
特徴とする異鋼種の連続鋳造方法。After using the same tundish continuously and reducing the pre-charge residual molten steel in the tundish to a certain height,
In a continuous casting method of different steel types in which post-charge molten steel is injected, the pre-charge remaining molten steel and the post-charge molten steel in a tundish are stirred and mixed, and the cut-off length of the mixed portion of the slab is calculated from the mixed molten steel component and the post-charge molten steel component. A method for continuous casting of different steel types, characterized by determining the
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14294490A JPH0433756A (en) | 1990-05-30 | 1990-05-30 | Method for continuously casting different steel kinds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14294490A JPH0433756A (en) | 1990-05-30 | 1990-05-30 | Method for continuously casting different steel kinds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0433756A true JPH0433756A (en) | 1992-02-05 |
Family
ID=15327281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14294490A Pending JPH0433756A (en) | 1990-05-30 | 1990-05-30 | Method for continuously casting different steel kinds |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0433756A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3088102B1 (en) | 2013-12-23 | 2017-11-08 | Posco | Method for continuously casting different grades of steel |
| CN113182500A (en) * | 2021-06-30 | 2021-07-30 | 北京科技大学 | Physical model-based method and system for predicting length and component change of mixed casting blank |
| CN113634728A (en) * | 2021-10-19 | 2021-11-12 | 北京科技大学 | Real-time determination method and display method for mixing rate of continuous casting actual mixed casting fixed-length casting blank |
-
1990
- 1990-05-30 JP JP14294490A patent/JPH0433756A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3088102B1 (en) | 2013-12-23 | 2017-11-08 | Posco | Method for continuously casting different grades of steel |
| CN113182500A (en) * | 2021-06-30 | 2021-07-30 | 北京科技大学 | Physical model-based method and system for predicting length and component change of mixed casting blank |
| CN113182500B (en) * | 2021-06-30 | 2021-10-15 | 北京科技大学 | Physical model-based method and system for predicting length and component change of mixed casting blank |
| CN113634728A (en) * | 2021-10-19 | 2021-11-12 | 北京科技大学 | Real-time determination method and display method for mixing rate of continuous casting actual mixed casting fixed-length casting blank |
| CN113634728B (en) * | 2021-10-19 | 2021-12-14 | 北京科技大学 | Real-time determination method and display method for mixing rate of continuous casting actual mixed casting fixed-length casting blank |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| RU2492023C2 (en) | Method and device for control over continuous cast billet solidification at continuous caster in starting casting process | |
| JP2009072800A (en) | Method for treating seam part slab in continuous casting of different steels | |
| JPH0433756A (en) | Method for continuously casting different steel kinds | |
| US20030154819A1 (en) | Model-based system for determining process parameters for the ladle refinement of steel | |
| JP4549201B2 (en) | Continuous casting method of different steel types | |
| KR100419886B1 (en) | Prediction method of the steel component during mixed grade continuous casting | |
| CN113814368A (en) | Continuous casting production method for single-ladle special steel grade with high coping capability | |
| Raza et al. | Effects of process related variations on defect formation in investment cast components | |
| KR950007169B1 (en) | A component estimate method of different kind steel mixing slab | |
| JPH0871712A (en) | Method for deciding mixing range of different kinds of steel in continuous casting | |
| JPH11216540A (en) | Different steel kindlings continuous casting | |
| KR102210201B1 (en) | Method for continuous casting | |
| JPH10249504A (en) | Cutting method of continuously cast slab | |
| JPH0461741B2 (en) | ||
| JP3251431B2 (en) | How to determine the treatment before and after the seam of the slab | |
| JPS626747A (en) | Method for cutting steel ingot | |
| JPH0919749A (en) | Method for controlling cut-off of cast slab in continuous casting | |
| KR102643833B1 (en) | Method of increasing prediction consistency of steel component during mixed grade continuous casting | |
| RU2204460C2 (en) | Method for continuous casting of steel | |
| JP2024068903A (en) | Method for determining the length of nonstandard cast strip and continuous casting method | |
| JP2002283021A (en) | Method for predicting surface crack on continuously cast slab | |
| JPS60234737A (en) | Treatment of molding sand | |
| JPS60177944A (en) | Method for correcting cutting length of continuous casting ingot | |
| JP2000117400A (en) | Method for adjusting components in metal | |
| JP4051834B2 (en) | Continuous casting operation method |