JPS606254A - Continuous casting method - Google Patents

Continuous casting method

Info

Publication number
JPS606254A
JPS606254A JP11364283A JP11364283A JPS606254A JP S606254 A JPS606254 A JP S606254A JP 11364283 A JP11364283 A JP 11364283A JP 11364283 A JP11364283 A JP 11364283A JP S606254 A JPS606254 A JP S606254A
Authority
JP
Japan
Prior art keywords
slab
continuous casting
point
roll
mold
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.)
Granted
Application number
JP11364283A
Other languages
Japanese (ja)
Other versions
JPS6234461B2 (en
Inventor
Katsuhiko Murakami
勝彦 村上
Yoshio Miyashita
宮下 芳雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP11364283A priority Critical patent/JPS606254A/en
Publication of JPS606254A publication Critical patent/JPS606254A/en
Publication of JPS6234461B2 publication Critical patent/JPS6234461B2/ja
Granted legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12Accessories for subsequent treating or working cast stock in situ
    • B22D11/128Accessories for subsequent treating or working cast stock in situ for removing

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

PURPOSE:To prevent generation of central segregation in a continuous casting billet in the stage of casting continuously a steel by changing the spacing between the rolls that contact with the continuous casting billet drawn from a mold according to the position of the billet to act bulging force to a part existing an unsolidified base. CONSTITUTION:The inter-roll spacing between the bottom end of a mold 3 for a continuous casting billet 1 and the crater end point A of a liquidus line is stepwise increased successively for each one roll and the rolls in the solid-liquid coexisting section 4 between the point A and the crater end point B of a solidus line are maintained at the specified spacing in the stage of pouring a molten steel into the mold 3 and performing continuous casting. The inter-roll spacing is stepwise narrowed for each one roll after the point B. Bulging force is thus acted to the solidified shell between the bottom end of the mold and the point A which is the cause for generation of central segregation thereby preventing the generation of the central segregation in the continuous casting billet 1.

Description

【発明の詳細な説明】 この発明は、中心偏析の低減を目的とした連続鋳造方法
に関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuous casting method aimed at reducing center segregation.

従来、中心偏析を低減するために、低温鋳造法やモール
ド内溶鋼等を電磁攪拌する方法が採用されていた。即ち
、これらの方法によって、鋳片の中心部付近の組織を等
軸晶化して、中心偏析の低減を図っていた。
Conventionally, in order to reduce center segregation, low-temperature casting methods and methods of electromagnetic stirring of molten steel in a mold have been adopted. That is, by these methods, the structure near the center of the slab is equiaxed crystallized to reduce center segregation.

しかし、上記方法によれば、巨大な中心偏析を低減させ
ることはできるが、比較的大きなV状偏析や島状偏析を
低減させることができないので。
However, according to the above method, although it is possible to reduce the huge central segregation, it is not possible to reduce the relatively large V-shaped segregation or island-shaped segregation.

上記方法は何れも本質的な中心偏析の低減対策となり得
々い。
None of the above methods can serve as a measure to essentially reduce center segregation.

上記方法におけるロールは、第1図(イ)に示されるよ
うに、モールドと固相線クレータエンドとの間に設置さ
れている複数個のロールのロール間隔(鋳片両側に相対
して設置される一対のロールの距離)を、鋳造後の鋳片
の温度低下に伴う熱収縮分に見合う量だけ上流側から1
0−ルごとに段階的に狭めて(lロール当り0.3〜0
.5 myn )設置していた。
As shown in Figure 1 (a), the rolls used in the above method are arranged between the rolls of a plurality of rolls installed between the mold and the solidus crater end. (distance between a pair of rolls) from the upstream side by an amount corresponding to the heat shrinkage caused by the temperature drop of the slab after casting.
0-roll by step narrowing (0.3 to 0 per liter roll)
.. 5 myn) was installed.

一方、別の中心偏析の低減法として、特開昭49−12
1’738号公報や特公昭54−22777号公報に開
示されるものがある。これらの方法は。
On the other hand, as another method for reducing center segregation,
Some of these are disclosed in Japanese Patent Publication No. 1'738 and Japanese Patent Publication No. 54-22777. These methods are.

第1図(ロ)に示すように、鋳片内の未凝固層の凝固末
期に、ロール間隔の狭め借を大幅に増大させ。
As shown in FIG. 1 (b), at the final stage of solidification of the unsolidified layer within the slab, the narrowing of the roll spacing is significantly increased.

即ち、鋳片の液相線クレータエンドと同相線クレータエ
ンドとの間に設置されている複数個のロールのロール間
隔を鋳片引き抜き方向に向うに従って]、ロールごとに
段階的に狭め、これによって。
In other words, the distance between the rolls of the plurality of rolls installed between the liquidus crater end and the inphase crater end of the slab is gradually narrowed for each roll as the slab is pulled out]. .

凝固末期の鋳片に圧下を加え、前記91片の収縮に伴う
濃化溶鋼の移動を防止して中心偏析を低減させるもので
ある。
This is to reduce center segregation by applying a reduction to the slab at the final stage of solidification to prevent movement of concentrated molten steel due to contraction of the 91 slabs.

しかし、上記凝固末期の鋳片内未凝固層の厚さを鋳片幅
方向に亘って均一にすることはきわめて困難である。未
凝固層の厚さが不均一であると。
However, it is extremely difficult to make the thickness of the unsolidified layer within the slab at the final stage of solidification uniform across the width of the slab. The thickness of the unsolidified layer is non-uniform.

第2図に示されるように、#片]の大幅圧下によって鋳
片内に閉塞された未凝固層2が点在する。
As shown in FIG. 2, unsolidified layers 2 are scattered within the slab due to the large reduction of the slab.

この結果、前記閉塞された未凝固層2に、凝固の進行に
伴い凝固収縮に起因して周囲の濃化溶鋼が吸引されるの
で、前記未凝固層2に偏析が生じる。
As a result, surrounding concentrated molten steel is sucked into the closed unsolidified layer 2 due to solidification shrinkage as solidification progresses, so segregation occurs in the unsolidified layer 2.

この発明は、上述のような問題点を解決するためになさ
れたものであって。
This invention was made to solve the above-mentioned problems.

連続鋳造法によって鋳片を鋳造するに際して。When casting slabs using the continuous casting method.

3− モールドと、鋳片の液相線クレータエンドとの間の凝固
シェルに、積極的に、バルジング力を作用させて、鋳片
内未凝固層の厚さを増大させ、次いで、前記液相線クレ
ータエンドと、前記鋳片の固相線クレータエンドとの間
の鋳片に圧下を加え、がかくして中心偏析の発生を低減
するこに特徴を着する。
3- Actively apply a bulging force to the solidified shell between the mold and the liquidus crater end of the slab to increase the thickness of the unsolidified layer within the slab, and then The present invention is characterized in that a reduction is applied to the slab between the line crater end and the solidus line crater end of the slab, thereby reducing the occurrence of center segregation.

この発明の方法を更に説明する。The method of this invention will be further explained.

連続鋳造された鋳片の凝固の進行状況を第3図に示し、
第4図(a)〜(c)に第3図の各部における鋳片の縦
断面を示す。第3および第4図において、lは鋳片、2
は鋳片l内の未凝固層、3はモールド、4は鋳片l内の
固液共存層、そして、5は凝固シェルであり、A点は鋳
片lの中心部が凝固を開始する点、即ち、液相線クレー
タエンドを示し、B点は鋳片1が凝固を完了する点、即
ち、固相線クレータエンドを示す。
Figure 3 shows the progress of solidification of continuously cast slabs.
FIGS. 4(a) to 4(c) show longitudinal cross-sections of the slab at each part in FIG. 3. In Figures 3 and 4, l is the slab, 2
is the unsolidified layer in the slab l, 3 is the mold, 4 is the solid-liquid coexistence layer in the slab l, and 5 is the solidified shell, and point A is the point where the center of the slab l starts solidifying. , that is, the liquidus crater end, and point B indicates the point at which the slab 1 completes solidification, that is, the solidus crater end.

鋼を連続鋳造するに際して、凝固シェル5に作用するバ
ルジング力は、鋳片内部割れおよび中心偏析の発生原因
となるところから、極力低減させ 4− ることか望オれている。しかし、液相線クレータエンド
A点から上流側では、未凝固層2の初期濃度の溶鋼が容
易に流動するために、前記A点から上流側でのバルジン
グ力は中心偏析の原因とはならない。
When continuously casting steel, it is desirable to reduce the bulging force acting on the solidified shell 5 as much as possible since it causes internal cracks in the slab and center segregation. However, upstream from the liquidus crater end point A, the molten steel at the initial concentration in the unsolidified layer 2 flows easily, so the bulging force upstream from the point A does not cause center segregation.

従って、この発明は、中心偏析の発生原因と々らない領
域で、鋳片に積極的にバルジング力を作用させ、これに
よって、前記領域における鋳片内の未凝固層の厚さを厚
くする。
Therefore, in the present invention, a bulging force is actively applied to the slab in a region where center segregation is not likely to occur, thereby increasing the thickness of the unsolidified layer within the slab in the region.

次に、この発明は、バルジング力によって未凝固層の厚
さが厚くなった鋳片1に、これが完全に凝固するまでの
間、圧下を加え、これによって。
Next, in the present invention, a reduction is applied to the slab 1 whose unsolidified layer has become thick due to the bulging force until it is completely solidified.

第1図(ロ)で示した場合と同様に、中心偏析の発生を
防止する。前記鋳片1に圧下を加えるに際して。
As in the case shown in FIG. 1(b), center segregation is prevented from occurring. When applying a reduction to the slab 1.

鋳片l内の未凝固層2は、前述したように、バルジング
力によってその厚みが厚くなっているので。
As mentioned above, the thickness of the unsolidified layer 2 in the slab l has increased due to the bulging force.

従来中じていた未凝固層2の閉塞を防止でき、この結果
、中心偏析の発生を大幅に低減することができる。この
点が、この発明の特徴である。
It is possible to prevent the unsolidified layer 2 from clogging, which has conventionally occurred, and as a result, the occurrence of center segregation can be significantly reduced. This point is a feature of the present invention.

液相線クレータエンドA点から上流側において。On the upstream side from the liquidus crater end point A.

5− 鋳片lにバルジング力を積極的に作用させて、未凝固層
2の厚さを増加させるには、モールド3と液相線クレー
タエンドA点との間に設置されているロールのロール間
隔を、上流側から前記A点に向うに従って10−ルごと
に段階的に広げる。この場合、10−ル当りのロール間
隔の増大量は1、5 rnynす、下が良く、これ以上
ロール間隔を増大させると凝固シェル5の変形量が大き
くなり過ぎて。
5- In order to increase the thickness of the unsolidified layer 2 by actively applying a bulging force to the slab l, the roll of the roll installed between the mold 3 and the liquidus crater end point A is used. The spacing is gradually widened every 10 l from the upstream side toward the point A. In this case, the amount of increase in the distance between the rolls per 10 mm is preferably less than 1.5 rnyn; if the distance between the rolls is increased more than this, the amount of deformation of the solidified shell 5 will become too large.

凝固シェルの凝固界面に割れが発生する。Cracks occur at the solidification interface of the solidified shell.

一方、液相線クレータエンドA点と、固相線クレータエ
ンド8点との間の鋳片1に圧下を加えるには、前記A点
とB点との間に設置されているロールのロール間隔を、
前記A点からB点に向うに従って10−ルごとに段階的
に減少させる。この場合、各ロールによる鋳片の圧下量
は、鋳片1m当り、鋳片厚さの0.2〜2.0%が圧下
により減少する程度とすると良い。
On the other hand, in order to apply a reduction to the slab 1 between the liquidus crater end point A and the solidus crater end point 8, the distance between the rolls installed between the points A and B is of,
It is decreased stepwise in steps of 10 lbs from point A to point B. In this case, the amount of reduction of the slab by each roll is preferably such that the thickness of the slab is reduced by 0.2 to 2.0% per meter of slab.

次に、この発明の実施例について説明する。Next, embodiments of the invention will be described.

第1図(ハ)に示すように、モールド下端で厚さ約22
8 mmの鋳片に対して、メニスカス(モールド6一 内湯呻から10771間に設置されているロール(7)
0一段間隔を、−に流側から〕−ロールごとに段階的に
広げ(逆テーパという)、メニスカスから10〜コ。2
m間に設置されているロールのロール間隔ハ゛ 一定と
し、メニスカスから]2〜20m間に設置されているロ
ールのロール間隔を、上流側から段階的に10−ルごと
に狭め(正テーパという)、との」:うにして鋳片の鋳
造を実施した。
As shown in Figure 1 (C), the thickness at the bottom of the mold is approximately 22 mm.
For an 8 mm slab, the meniscus (roll (7) installed between mold 6 and 10771)
0 step interval from the flow side to - stepwise widen for each roll (referred to as reverse taper), 10 to 10 steps from the meniscus. 2
The roll spacing of the rolls installed between 2 and 20 meters is kept constant, and the roll spacing of the rolls installed between 2 and 20 meters from the meniscus is gradually narrowed every 10 rolls from the upstream side (referred to as a positive taper). , Tono': Casting of slabs was carried out.

第1表に、その他の鋳造多件と01片の中心偏析レベル
の結果を、従来例の結果と比較して示す。
Table 1 shows the results of other casting cases and the center segregation level of the 01 piece in comparison with the results of the conventional example.

−7= 第1表から明らかなように1本発明によれば。−7= According to the present invention, as is clear from Table 1.

従来法に比べて、鋳片断面積に占める中心偏析の面積割
合(中心偏析面積率)および中心偏析粒数が飛躍的に減
少している。
Compared to the conventional method, the area ratio of center segregation to the cross-sectional area of the slab (center segregation area ratio) and the number of center segregation grains are dramatically reduced.

以」二説明したように、この発明によれば、中心偏析を
大幅に低減することができるといった有用な効果がもた
らされる。
As explained above, the present invention brings about the useful effect of being able to significantly reduce center segregation.

【図面の簡単な説明】[Brief explanation of the drawing]

第19図は、メニスカスからの距離とロール間隔との関
係を示す図、第2図は、未凝固層が点在する鋳片の縦断
面図、第3図は、凝固の進行状況を示す鋳片の長さ方向
の断面図、第4図(a)〜(C)は。 バルジング力が作用した鋳片の縦断面図である。 図面において、 1・・・鋳片 2・・・未凝固層 3・・・モールド 4・・・固液共存層5・・・凝固シ
ェル 一9′− 8− 手続補正書(方式) 昭和58年lO月14日 特許庁長官 若 杉 和 夫 殿 1、事件の表示 特願昭58−113642号 2、発明の名称 連続鋳造方法 3、補正をする者 事件との関係 特許出願人 住所 東京都千代田区丸の内−丁目1番2号録(A称)
 日本鋼管株式会社 代表者 金 尾 實 4、代理人 明細書の発明の詳細な説明の欄およUArm7、補正の
内容 別紙の通り (1) 明細書、第4頁、発明の詳細な説明の欄、10
〜11行目、 「第4図(a)〜(C)・・・・・・を示す。」とある
を、[第4図(a)は第5図のI−I間断面図、同(b
)は第3図のTI−JT間断面図、同(C)は第3図の
m−■間断面図を示す。」に訂正する。 (2)第4図を別紙の通シ訂正する。 8 添付書類の目録 (1)訂正図面 1通 以上
FIG. 19 is a diagram showing the relationship between the distance from the meniscus and the roll interval, FIG. 2 is a longitudinal cross-sectional view of a slab with unsolidified layers scattered, and FIG. 3 is a diagram showing the progress of solidification. 4(a)-(C) are longitudinal sectional views of the piece. FIG. 3 is a longitudinal cross-sectional view of a slab on which a bulging force is applied. In the drawings: 1... Slab 2... Unsolidified layer 3... Mold 4... Solid-liquid coexistence layer 5... Solidified shell 19'- 8- Procedural amendment (method) 1981 January 14, 2016 Kazuo Wakasugi, Commissioner of the Japan Patent Office1, Indication of the case, Patent Application No. 113642/1982, Name of the invention, Continuous casting method, 3, Person making the amendment, Relationship with the case Patent applicant address: Chiyoda-ku, Tokyo Marunouchi-chome 1-2 record (name A)
Representative of Nippon Kokan Co., Ltd. Minoru Kaneo 4, Detailed description of the invention column in the agent's specification and UArm 7, Contents of the amendment As attached (1) Specification, page 4, Detailed description of the invention column , 10
~11th line, "Figures 4 (a) to (C) ...... are shown." (b
) shows a sectional view between TI and JT in FIG. 3, and (C) shows a sectional view between m and ■ in FIG. ” is corrected. (2) Figure 4 will be corrected in the attached document. 8 List of attached documents (1) One or more corrected drawings

Claims (1)

【特許請求の範囲】[Claims] 連続鋳造法によって鋳片を鋳造するに際して、モールド
と、鋳片の液相線クレータエンドとの間の凝固シェルに
、積極的にバルジング力を作用させて、鋳片内未凝固層
の厚さを増大させ1、次いで、前記液相線クレータエン
ドと、前記鋳片の固相線クレータエンドとの間の鋳片に
圧下を加え、かくして中心偏析の発生を低減することを
特徴とする連続鋳造方法。
When casting slabs using the continuous casting method, a bulging force is actively applied to the solidified shell between the mold and the liquidus crater end of the slab to reduce the thickness of the unsolidified layer within the slab. 1, and then applying a reduction to the slab between the liquidus crater end and the solidus crater end of the slab, thus reducing the occurrence of center segregation. .
JP11364283A 1983-06-25 1983-06-25 Continuous casting method Granted JPS606254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11364283A JPS606254A (en) 1983-06-25 1983-06-25 Continuous casting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11364283A JPS606254A (en) 1983-06-25 1983-06-25 Continuous casting method

Publications (2)

Publication Number Publication Date
JPS606254A true JPS606254A (en) 1985-01-12
JPS6234461B2 JPS6234461B2 (en) 1987-07-27

Family

ID=14617409

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11364283A Granted JPS606254A (en) 1983-06-25 1983-06-25 Continuous casting method

Country Status (1)

Country Link
JP (1) JPS606254A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61238449A (en) * 1985-04-15 1986-10-23 Ishikawajima Harima Heavy Ind Co Ltd Apparatus for producing steel ingot
JP2009119486A (en) * 2007-11-13 2009-06-04 Jfe Steel Corp Method for producing continuously cast slab
JP2010158719A (en) * 2008-12-10 2010-07-22 Jfe Steel Corp Method for manufacturing continuously cast slab
JP2011121063A (en) * 2009-12-08 2011-06-23 Jfe Steel Corp Continuous casting method with soft reduction
JP2016019993A (en) * 2014-07-15 2016-02-04 Jfeスチール株式会社 Continuous casting method of steel
JP7371821B1 (en) * 2022-06-29 2023-10-31 Jfeスチール株式会社 Continuous steel casting method
WO2024004447A1 (en) * 2022-06-29 2024-01-04 Jfeスチール株式会社 Steel continuous casting method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4508087B2 (en) * 2005-11-17 2010-07-21 住友金属工業株式会社 Continuous casting method and continuous cast slab

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61238449A (en) * 1985-04-15 1986-10-23 Ishikawajima Harima Heavy Ind Co Ltd Apparatus for producing steel ingot
JPH0336619B2 (en) * 1985-04-15 1991-06-03 Ishikawajima Harima Heavy Ind
JP2009119486A (en) * 2007-11-13 2009-06-04 Jfe Steel Corp Method for producing continuously cast slab
JP2010158719A (en) * 2008-12-10 2010-07-22 Jfe Steel Corp Method for manufacturing continuously cast slab
JP2011121063A (en) * 2009-12-08 2011-06-23 Jfe Steel Corp Continuous casting method with soft reduction
JP2016019993A (en) * 2014-07-15 2016-02-04 Jfeスチール株式会社 Continuous casting method of steel
JP7371821B1 (en) * 2022-06-29 2023-10-31 Jfeスチール株式会社 Continuous steel casting method
WO2024004447A1 (en) * 2022-06-29 2024-01-04 Jfeスチール株式会社 Steel continuous casting method

Also Published As

Publication number Publication date
JPS6234461B2 (en) 1987-07-27

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