JPS5842778B2 - Continuous casting method for slabs for cold-rolled steel sheets - Google Patents

Continuous casting method for slabs for cold-rolled steel sheets

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Publication number
JPS5842778B2
JPS5842778B2 JP6576479A JP6576479A JPS5842778B2 JP S5842778 B2 JPS5842778 B2 JP S5842778B2 JP 6576479 A JP6576479 A JP 6576479A JP 6576479 A JP6576479 A JP 6576479A JP S5842778 B2 JPS5842778 B2 JP S5842778B2
Authority
JP
Japan
Prior art keywords
steel
cold
continuous casting
slabs
rolled steel
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
Application number
JP6576479A
Other languages
Japanese (ja)
Other versions
JPS55156647A (en
Inventor
和彦 札場
一正 山崎
治 秋末
栄一 竹内
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP6576479A priority Critical patent/JPS5842778B2/en
Publication of JPS55156647A publication Critical patent/JPS55156647A/en
Publication of JPS5842778B2 publication Critical patent/JPS5842778B2/en
Expired legal-status Critical Current

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Description

【発明の詳細な説明】 この発明は、冷延鋼板をプレス成形した場合に肌荒れが
発生しない安価な成分組成を得ると共にこの弱脱酸鋼を
ピンホールの発生なしに連続鋳造する方法に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for obtaining an inexpensive composition that does not cause surface roughness when press-forming cold-rolled steel sheets, and for continuously casting this weakly deoxidized steel without forming pinholes. be.

従来から、連続鋳造によりリムド鋼相当の弱脱酸鋼を鋳
造しようとする方法は多く提案されているが、これまで
知られているところでは、鋳片のピンホールの発生を完
全に防止するためには、脱酸剤を添加するとか、真空脱
ガス処理を施こすとかして溶鋼中の自由酸素量を70p
pm以下に抑えなければならない。
Up until now, many methods have been proposed for casting weakly deoxidized steel equivalent to rimmed steel by continuous casting. In order to reduce the amount of free oxygen in molten steel to 70p by adding a deoxidizing agent or performing vacuum degassing treatment.
Must be kept below pm.

ところが、前者の脱酸剤、特にAl、Siの添加は、リ
ムド鋼の表面特注が良いという特徴を失なわせることに
なり、後者の真空脱ガス処理による方法或いは少量の脱
酸剤を併用する方法では、冷間圧延後箱焼鈍を行なうに
さいして析出物による結晶粒成長の抑制効果がなくなり
、特にコイルの外周部は高温になるため、この部分にお
いて異常な粗大粒が戒長し、プレス成形時に肌荒れが発
生するという欠点があった。
However, the former method of adding deoxidizing agents, especially Al and Si, causes the rimmed steel to lose its characteristic of good surface customization, and the latter method of vacuum degassing treatment or the combination of a small amount of deoxidizing agent is recommended. In this method, when box annealing is performed after cold rolling, the effect of suppressing crystal grain growth due to precipitates is lost, and the outer periphery of the coil is particularly hot, so abnormally coarse grains become elongated in this area, causing the pressing There was a drawback that rough skin occurred during molding.

この発明は上記の難点を排除する弱脱酸鋼組成物を提供
すると共に、この弱脱酸鋼の連続鋳造を可能としたもの
である。
The present invention provides a weakly deoxidized steel composition that eliminates the above-mentioned difficulties, and also enables continuous casting of this weakly deoxidized steel.

この発明における冷延鋼板のプレス成形時肌荒れが発生
しない弱脱酸鋼組成物は、C0,02〜0.15%、P
ζ0.002%、si<、o、o’t%及びklζ0.
005%(脱酸するには少い量)、残部Fe及び不可避
的不純物を含有する溶鋼において物に胤を0.06〜0
.20%、自由酸素を70〜250 ppmに調整した
ものである。
The weakly deoxidized steel composition in this invention that does not cause surface roughness during press forming of a cold rolled steel sheet contains 0.02 to 0.15% C, P
ζ0.002%, si<, o, o't% and klζ0.
0.05% (a small amount for deoxidation), the balance is Fe and unavoidable impurities.
.. 20%, with free oxygen adjusted to 70-250 ppm.

この様に成分調整された溶鋼から得られた冷延鋼板は、
再結晶焼鈍において異常な粗大粒成長は抑制されるとい
う特徴をもつものであるが、自由酸素含有量が70pp
m以上(250ppmまで)であるために連続鋳造した
場合、前述した様に表面直下にピンホールが生成し健全
なスラブとして次工程に供することはできない。
The cold-rolled steel sheet obtained from the molten steel whose composition has been adjusted in this way is
It has the characteristic that abnormal coarse grain growth is suppressed during recrystallization annealing, but when the free oxygen content is 70pp
m or more (up to 250 ppm), when continuous casting is performed, pinholes are generated just below the surface as described above, and the slab cannot be used for the next process as a sound slab.

そこで、この発明ではピンホールの生成なしに連続鋳造
することについて鋭意検討した結果、連続鋳造装置に鋳
造されつつある溶鋼の凝固界面に電磁流動を付与するこ
とにより成功したものである。
Therefore, in this invention, as a result of intensive study on continuous casting without the formation of pinholes, we succeeded by applying electromagnetic flow to the solidification interface of molten steel being cast in a continuous casting machine.

この発明でいう電磁流動とは本発明者らの調査結果であ
る、 1)後でピンホールに成長するピンホールの核発生は、
これの成長に比べておこりにくく所定以上の元素濃度を
必要とする、 2)ピンホールの核は凝固開始点すなわち鋳造内湯面部
位の凝固界面からすでに発生する、3)溶鋼中元素濃度
は凝固界面において著しく濃化する、 事実に着目し、鋳型内溶鋼湯面部位凝固界面における元
素濃度をピンホールの核の発生限界以下とし、しかもそ
の際に湯面上パウダーを乱さない程度の流速のものを指
す。
The electromagnetic flow referred to in this invention is the result of investigation by the present inventors. 1) Nucleation of pinholes that later grow into pinholes is caused by:
2) Pinhole nuclei are generated from the solidification initiation point, that is, the solidification interface at the molten metal level in the casting. 3) The element concentration in molten steel is determined by the concentration of elements at the solidification interface. Focusing on the fact that the molten steel concentrates significantly at the surface of the molten steel in the mold, the element concentration at the solidification interface of the surface of the molten steel was set to be below the generation limit of pinhole nuclei, and at the same time, the flow rate was set at a level that did not disturb the powder on the surface of the molten steel. Point.

すなわち、鋳型内湯面部位の凝固界面全周囲に与える、
ピンホールの核の生成の抑制に有効な膜状の溶鋼流動を
いい、後述の如く特に鋳型内に設置したりニヤモーター
にて与える電磁流動をいい、従来行なわれている、いわ
ゆる電磁攪拌とは区別されるものである。
In other words, it is applied to the entire surroundings of the solidification interface at the surface of the mold.
It refers to a film-like flow of molten steel that is effective in suppressing the formation of pinhole nuclei, and as described later, it refers to electromagnetic flow installed in a mold or applied by a near motor, and is different from the so-called electromagnetic stirring that is conventionally performed. They are distinct.

このように鋳造過程において湯面部位の凝固界面全周壁
に溶鋼の電磁流動を与えることにより凝固界面での成分
元素の濃化が抑制されて得られる鋳片の表層部全周にピ
ンホールのない健全な凝固層が形成され、しかもこの流
動は後述の如くゆるやかで、かつ凝固壁に近い部分に与
えるものであることから湯面(パウダー)を伺ら乱すこ
とが無いものである。
In this way, by applying electromagnetic flow of molten steel to the entire circumference of the solidification interface at the surface of the molten metal during the casting process, the concentration of component elements at the solidification interface is suppressed, resulting in a slab with no pinholes around the entire surface layer. A healthy solidified layer is formed, and since this flow is gentle as described below and is applied to a portion close to the solidified wall, it does not disturb the surface of the hot water (powder).

上記の電磁流動の流速は定量的には0.1〜1.0 m
/ see程度のもので、これであるとピンホールの核
生成の抑制と湯面上パウダーを乱さないこととの両方を
同時に満足する。
Quantitatively, the flow velocity of the electromagnetic flow mentioned above is 0.1 to 1.0 m.
/see, which simultaneously satisfies both the suppression of pinhole nucleation and the prevention of disturbing the powder on the surface of the hot water.

そして、この電磁流動の及ぶ範囲が広過ぎる場合には溶
鋼注入用浸漬ノズルに影響を受けて湯面パウダーに乱れ
が生じ、パウダー巻き込み等により正常なパウダーキャ
スティングが実施できなくなるので、電磁流動はできる
限り凝固壁に近い部分で生じさせるのが好ましい。
If the area covered by this electromagnetic flow is too wide, it will be affected by the immersion nozzle for pouring molten steel and the surface powder will be disturbed, and normal powder casting will not be possible due to powder entrainment. It is preferable to generate it as close to the solidification wall as possible.

このさいの電磁流動は、鋳型の直下に装置を設けて生成
した気泡を浮上除去する方法も考えられるが、これでは
鋳型・内湯面でどうしても溶鋼流動のよどみ部が生じる
のでそれよりも鋳型の内部、それも上方の内部に電磁流
動の形成器すなわちリニヤモーターを設置し、これによ
り鋳型内情鋼の湯面直下において鋳型壁面に沿った膜状
の流動を生じさせ、気泡を生成核の段階で消滅させる方
法がより好ましい。
At this time, electromagnetic flow can be used to float and remove the bubbles generated by installing a device directly below the mold, but this inevitably creates stagnation of the molten steel flow at the mold and inner hot water surface, so it is better to use the electromagnetic flow inside the mold. Also, an electromagnetic flow generator, i.e., a linear motor, is installed inside the upper part of the mold, and this creates a film-like flow along the mold wall just below the surface of the steel inside the mold, causing the bubbles to disappear at the stage of forming nuclei. It is more preferable to do so.

以下この発明の成分組成について詳しく説明する。The component composition of this invention will be explained in detail below.

先づMnはS及びOと結合してMnS及びMn0とし析
出することは知られている。
First, it is known that Mn combines with S and O to precipitate as MnS and Mn0.

これらの析出物は大きさ及び量によっては、結晶粒の成
長を抑制するが、その抑制が不完全であると高温で焼鈍
されたときに異常粒成長を起す。
Depending on the size and amount, these precipitates suppress grain growth, but if the suppression is incomplete, abnormal grain growth occurs when annealed at high temperatures.

この発明者等は、Al、Siで脱酸しない弱脱酸鋼の連
続鋳造鋼においては、MnS、MnOを均一に分散させ
、しかも粒成長抑制効果が最も強く現われる成分範囲と
してMnζ0.20%かつ自由酸素≧70 ppm好ま
しくは〉1100ppを見い出した。
These inventors have determined that in continuously cast steel that is a weakly deoxidized steel that is not deoxidized with Al or Si, Mnζ0.20% and We found free oxygen ≧70 ppm, preferably ≧1100 ppm.

この場合、Mnの下限値は0.06%であり、これより
低い値であると箱焼鈍時、緩慢再結晶を示すようになり
、焼鈍温度を高くしたり或いは時間がかかったりするな
どの問題が生じるものである。
In this case, the lower limit of Mn is 0.06%, and if the value is lower than this, slow recrystallization will occur during box annealing, leading to problems such as increasing the annealing temperature or taking more time. occurs.

一方自由酸素の上限値については250 ppm以上に
なると連続鋳造時に電磁流動を作用させてもピンホール
の生成を防止することができず、又鋳造時に突沸が起っ
たり、ブレークアウトが起こるなど操業上に支障を来た
すようになるものである。
On the other hand, if the upper limit of free oxygen exceeds 250 ppm, pinhole formation cannot be prevented even if electromagnetic flow is applied during continuous casting, and bumping or breakout may occur during casting, causing operational problems. This will cause problems for those above.

以上がMn及び自由酸素の限定理由である。The above is the reason for limiting Mn and free oxygen.

Cは、プレス成形に使用される冷延鋼板では軟質である
ことを要するので、0.10%以下であることが好まし
いが、ブリキ原板として使用される場合、硬さを維持す
ることが必要であるため、0.15%を上限値とした。
C is preferably 0.10% or less because cold-rolled steel sheets used for press forming need to be soft, but when used as tin plate blanks, it is necessary to maintain hardness. Therefore, the upper limit was set at 0.15%.

下限値は、成形性の点から低い方がよいが、通常の転炉
溶製では経済的な観点から下限を0.02%とすべきで
ある。
The lower the lower limit, the better from the point of view of formability, but in ordinary converter melting, the lower limit should be 0.02% from an economical point of view.

Si、Alについてはこの発明では積極的に脱酸に使用
しないので、不可避的含有量、即ちSi<0.02%、
AAζ0.005%とした。
Since Si and Al are not actively used for deoxidation in this invention, their unavoidable contents, that is, Si<0.02%,
AAζ was set at 0.005%.

尚Pは低い種材質に好ましく、又Sは材質の劣化を防ぐ
ため、夫々P<;:0.025%、Sζ0.020%と
した。
Note that P is preferable for low seed materials, and S is set to P<;: 0.025% and Sζ0.020%, respectively, in order to prevent deterioration of the material.

このような成分に調整された溶鋼を、周知の連続鋳造装
置により電磁流動を作用させつつ鋳造してピンホールの
ない弱脱酸鋼スラブを製造し、これを常法にしたがって
熱延及び冷延を行い、500°C以上の温度で再結晶焼
鈍を施こして結晶粒が適当な大きさで均一にそろった冷
延鋼板を得るものである。
Molten steel adjusted to such a composition is cast using electromagnetic flow using a well-known continuous casting device to produce a weakly deoxidized steel slab without pinholes, which is then hot-rolled and cold-rolled according to conventional methods. Then, recrystallization annealing is performed at a temperature of 500° C. or higher to obtain a cold-rolled steel sheet with uniform grains of appropriate size.

次に本発明の実施例について述べる。Next, embodiments of the present invention will be described.

Mn、自由酸素レベルを変えた12種の鋼を溶製し、鋳
型向凝固界面に電磁流動を与えつつ連続鋳造し、スラブ
を造った。
Twelve types of steel with varying Mn and free oxygen levels were melted and continuously cast while applying electromagnetic flow to the pro-solidification interface of the mold to create slabs.

電磁流動はスラブ鋳型内部の両長辺にそってリニヤモー
ターを設置し、与える推力方向を互いに反対向きとして
鋳型内の溶鋼湯面部から下100mmまでの間の凝固界
面溶鋼にO14〜1.0 m / secの鋳型内壁に
沿った膜状の回転流動を与えたものである。
For electromagnetic flow, linear motors are installed along both long sides of the inside of the slab mold, and the directions of the thrusts applied are opposite to each other, and O14 to 1.0 m is applied to the molten steel at the solidification interface from the surface of the molten steel in the mold to 100 mm below. A film-like rotational flow along the inner wall of the mold is applied.

これらのスラブの中でピンホールのない健全なスラブを
加熱炉で1100〜1280℃で加熱し、仕上温度87
0°C〜890℃で熱間圧延し、板厚を2.5關とした
後、5700C〜650°Cで巻取り、次いで0.8
mmまで冷間圧延し、次いで再結晶温度以上の温度で箱
焼鈍を行ない、1.0%のスキンパス圧延を施こした。
Among these slabs, healthy slabs without pinholes are heated in a heating furnace at 1100 to 1280°C to a finishing temperature of 87°C.
After hot rolling at 0°C to 890°C to a plate thickness of 2.5 mm, it was rolled up at 5700°C to 650°C, and then 0.8 mm thick.
The material was cold rolled to 1.0 mm, then box annealed at a temperature higher than the recrystallization temperature, and subjected to 1.0% skin pass rolling.

溶鋼中の自由酸素量が250ppm以上であったスラブ
についてはピンホールが発生し、商品としての価値がな
いため後工程へは流さなかった。
Slabs in which the amount of free oxygen in the molten steel was 250 ppm or more were not sent to subsequent processes because pinholes were generated and the slabs had no value as commercial products.

以上のようにして製造された冷延鋼板のプレス成形時の
肌荒れ発生の有無を判定する方法としてエリクセン試験
機を用いた張り出し試験を行なつた。
As a method of determining the presence or absence of surface roughness during press forming of the cold-rolled steel sheet produced as described above, a stretch test using an Erichsen tester was conducted.

これは張り出し過程の鋼板表面を目視により観察し肌荒
れを確認する方法で、これにより肌荒れ発生の有無が判
定できる。
This is a method in which the surface of the steel plate is visually observed during the elongation process to check for roughness, and it can be determined whether or not roughness has occurred.

本発明鋼及び比較鋼の化学成分を第1表に製造条件及び
張り出し試験の結果を第2表に示す。
The chemical compositions of the invention steel and comparative steel are shown in Table 1, and the manufacturing conditions and results of the overhang test are shown in Table 2.

また第1図にMn及び自由酸素の範囲と肌荒れ発生の関
係について示した。
Further, FIG. 1 shows the relationship between the range of Mn and free oxygen and the occurrence of rough skin.

第2表から明らかなように、本発明鋼の範囲を逸脱する
成分範囲の比較鋼においてはいずれも肌荒れが発生して
いる。
As is clear from Table 2, all of the comparative steels with composition ranges outside the range of the steel of the present invention had rough skin.

これは第2図すに示すような異常な粗大粒が発生してい
るためである。
This is due to the occurrence of abnormally coarse grains as shown in Figure 2.

これに対して本発明鋼の成分範囲を満足するA、B。On the other hand, A and B satisfy the composition range of the steel of the present invention.

C,Dの鋼ではいずれも第2図aに示すような健全な組
織を有しており、肌荒れは発生していない。
Both steels C and D had a healthy structure as shown in FIG. 2a, and no roughening occurred.

以上から本発明鋼板は連続鋳造により製造されたリムド
鋼に相当するプレス成形時肌荒れの発生しない冷延鋼板
であることがわかる。
From the above, it can be seen that the steel sheet of the present invention is a cold-rolled steel sheet that does not cause surface roughness during press forming, which corresponds to rimmed steel manufactured by continuous casting.

※1) 箱焼鈍サイクル710−6,10,12いずれ
もコイル外周部は約750℃となる。
*1) In all box annealing cycles 710-6, 10, and 12, the temperature at the outer periphery of the coil is approximately 750°C.

※2) 比較鋼には緩慢再結晶を起こし、焼不良が見ら
れた。
*2) Slow recrystallization occurred in the comparison steel, and poor quenching was observed.

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

第1図はMn及び自由酸素の範囲と肌荒れ発生の関係を
示す図、第2図aは実施例における本発明鋼の組織を示
す顕微鏡写真、 織を示す顕微鏡写真である。 同すは比較例の組
Fig. 1 is a diagram showing the relationship between the range of Mn and free oxygen and the occurrence of rough skin, and Fig. 2a is a microscopic photograph showing the structure and weave of the steel of the present invention in an example. The same is a set of comparative examples

Claims (1)

【特許請求の範囲】[Claims] I C0,02〜0.15%、P≦0.025%、S
<0.020%、脱酸するには少ない量であるSi〈0
.01%及びAl<、0.005%、残部Fe及び不可
避的不純物を含有する溶鋼においてMn含有量を0.0
6〜0.20%、自由酸素量を70〜250ppmに調
整した溶鋼の凝固界面に電磁流動を与えつつ連続鋳造し
、プレス成形時に肌荒れが発生せずかつピンホールのな
い健全なスラブを得ることを特徴とする、冷延鋼板用鋳
片の連続鋳造方法。
I C0.02~0.15%, P≦0.025%, S
<0.020%, a small amount of Si<0 to deoxidize
.. 01% and Al<, 0.005%, the balance is Fe and unavoidable impurities.
6 to 0.20% and a free oxygen content of 70 to 250 ppm, continuous casting is performed while applying electromagnetic flow to the solidification interface of the molten steel, and a sound slab without roughness during press forming and without pinholes is obtained. A continuous casting method for slabs for cold-rolled steel sheets, characterized by:
JP6576479A 1979-05-28 1979-05-28 Continuous casting method for slabs for cold-rolled steel sheets Expired JPS5842778B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6576479A JPS5842778B2 (en) 1979-05-28 1979-05-28 Continuous casting method for slabs for cold-rolled steel sheets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6576479A JPS5842778B2 (en) 1979-05-28 1979-05-28 Continuous casting method for slabs for cold-rolled steel sheets

Publications (2)

Publication Number Publication Date
JPS55156647A JPS55156647A (en) 1980-12-05
JPS5842778B2 true JPS5842778B2 (en) 1983-09-21

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Country Link
JP (1) JPS5842778B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57118846A (en) * 1981-01-14 1982-07-23 Nippon Steel Corp Production of continuously cast ingot
JPS615963A (en) * 1984-06-20 1986-01-11 Showa Joho Kiki Kk Multicolor thermal recorder
KR100406413B1 (en) * 1999-11-01 2003-11-19 주식회사 포스코 Method of continuous casting weathering steel for cold rolling
KR102349667B1 (en) * 2017-01-13 2022-01-12 아사히 가세이 가부시키가이샤 Electrolysis electrode, electrolyzer, electrode stack and electrode renewal method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160333488A1 (en) * 2014-01-15 2016-11-17 Thyssenkrupp Uhde Chlorine Engineers (Japan) Ltd. Anode for ion exchange membrane electrolysis vessel, and ion exchange membrane electrolysis vessel using same

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