JPH1058106A - Continuous casting method reducing center porosity - Google Patents
Continuous casting method reducing center porosityInfo
- Publication number
- JPH1058106A JPH1058106A JP22371396A JP22371396A JPH1058106A JP H1058106 A JPH1058106 A JP H1058106A JP 22371396 A JP22371396 A JP 22371396A JP 22371396 A JP22371396 A JP 22371396A JP H1058106 A JPH1058106 A JP H1058106A
- Authority
- JP
- Japan
- Prior art keywords
- center
- slab
- reduction
- center porosity
- rolling reduction
- 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.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、連続鋳造鋳片のセ
ンターポロシティを軽減するための連続鋳造法に関す
る。The present invention relates to a continuous casting method for reducing the center porosity of a continuous cast slab.
【0002】[0002]
【従来の技術】連続鋳造鋳片の中心部には、溶鋼の凝固
収縮に伴って生じる小さな空孔、いわゆるセンターポロ
シティが形成される。このセンターポロシティは、極厚
鋼板のUST不良やシームレス鋼管の内面欠陥等の原因
となることが多い。2. Description of the Related Art In a central portion of a continuously cast slab, small holes, so-called center porosity, which are formed due to solidification shrinkage of molten steel are formed. The center porosity often causes UST failure of an extremely thick steel plate or an inner surface defect of a seamless steel pipe.
【0003】とくに、鋳片を薄手化、小断面化して圧延
工程の負荷を軽減しようとする場合、センターポロシテ
ィが圧着されず製品欠陥の原因となり易い。また水素性
欠陥との関連においても、センターポロシティが問題と
なることが多く、鋳片段階でセンターポロシティを軽減
する技術が必要となっている。In particular, when trying to reduce the load of the rolling step by reducing the thickness of the cast slab and reducing its cross section, the center porosity is not crimped and tends to cause product defects. In addition, center porosity often poses a problem in relation to hydrogen defects, and a technique for reducing the center porosity at the slab stage is required.
【0004】近年、連続鋳造鋳片の中心部の偏析を軽減
するために、未凝固の鋳片を軽圧下する技術が多数開発
されているが、このような軽圧下はサイズの大きいセン
ターポロシティを少なくする上でも有効なことが知られ
ている。In recent years, many techniques have been developed to reduce the segregation at the center of a continuous cast slab by reducing the unsolidified slab lightly. However, such light reduction requires a large center porosity. It is known that it is effective in reducing the amount.
【0005】例えば、本発明の発明者らが特開平4−2
79265号公報において開示したように、鋳片中心部
の固相率が0.05から流動限界固相率(固相率で0.
7程度)の範囲で2段の軽圧下を行うことにより、最大
偏析粒径が大幅に低下し、これに伴ってサイズの大きい
センターポロシティが顕著に低減されることが確かめら
れている。For example, the inventors of the present invention disclosed in Japanese Patent Laid-Open No.
As disclosed in JP-A-79265, the solid fraction at the center of the slab is 0.05 to the flow limit solid fraction (solid fraction of 0.1%).
It has been confirmed that by performing the two-step light reduction in the range of about 7), the maximum segregation particle size is significantly reduced, and the center porosity having a large size is significantly reduced accordingly.
【0006】しかし、上記の軽圧下法によっても、最終
圧下位置での鋳片中心部の固相率は0.7以下であり、
その後の凝固収縮によって体積率で1〜2%以上のセン
ターポロシティが形成される。すなわち、従来の軽圧下
法はセンターポロシティの小サイズ化には有効である
が、その体積率の低減は必ずしも十分でなく、さらなる
改善が必要となっている。However, even with the above-described light rolling method, the solid fraction at the center of the slab at the final rolling position is 0.7 or less,
Subsequent solidification shrinkage forms a center porosity of 1 to 2% or more by volume. That is, the conventional light reduction method is effective in reducing the size of the center porosity, but the reduction in the volume ratio is not necessarily sufficient, and further improvement is required.
【0007】[0007]
【発明が解決しようとする課題】本発明は、従来の連続
鋳造鋳片の軽圧下法によるよりも、さらにセンターポロ
シティを軽減しうる連続鋳造法を提供することを目的と
する。そのために、本発明においては凝固未期に鋳片の
圧下を行うが、鋳片の割れや中心偏析の悪化を伴うこと
なく、センターポロシティの大幅低減が可能な圧下方法
を提示することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a continuous casting method capable of further reducing the center porosity as compared with the conventional continuous casting slab light reduction method. Therefore, in the present invention, the slab is reduced in the early stage of solidification, without the accompanying deterioration of the slab cracks and center segregation, with the object of presenting a reduction method capable of significantly reducing the center porosity. I do.
【0008】[0008]
【課題を解決するための手段】上記の課題を解決するた
めの本発明の要旨は、凝固未期に鋳片を圧下しつつ引き
抜く溶融金属の連続鋳造法において、鋳片中心部の温度
が固相率0.05〜0.7に相当する鋳片位置に少なく
とも一対のロールを設置して鋳片を4〜20mm圧下する
と共に、鋳片中心部の温度が固相率0.8以上の鋳片位
置に少なくとも一対のロールを設置して5〜20%の圧
下率で鋳片を圧下することを特徴とする、センターポロ
シティを軽減する連続鋳造法である。The gist of the present invention to solve the above-mentioned problems is to provide a continuous casting method of molten metal in which a slab is drawn down while being solidified before solidification. At least a pair of rolls are installed at the slab position corresponding to the phase ratio of 0.05 to 0.7 to reduce the slab by 4 to 20 mm, and the temperature at the center of the slab is 0.8% or more. A continuous casting method for reducing center porosity, characterized in that at least one pair of rolls is installed at one position and a cast piece is reduced at a reduction rate of 5 to 20%.
【0009】[0009]
【発明の実施の形態】図1は、本発明における圧下ロー
ルの配置例を示す模式図で、鋳片1を未凝固部分2が存
在する位置で軽圧下用ロール3で圧下し、さらにその後
方においてセンターポロシティ圧下用ロール4で圧下す
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view showing an example of the arrangement of a reduction roll according to the present invention. A slab 1 is reduced by a light reduction roll 3 at a position where an unsolidified portion 2 is present, and further rearward. , The center porosity reduction roll 4 is used to reduce the pressure.
【0010】本発明において、このように軽圧下とセン
ターポロシティの圧下とを組合わせる理由は、軽圧下に
より鋳片の中心偏析を軽減することの他に、軽圧下によ
り鋳片中心部の偏析粒径を小さくし或いは等軸晶率を大
きくして、センターポロシティの小サイズ化・分散化を
図り、これによりセンターポロシティの圧着を容易にす
るためである。In the present invention, the reason for combining the light reduction with the reduction of the center porosity in this way is to reduce the segregation of the center of the slab by the light reduction and to reduce the segregation particles in the center of the slab by the light reduction. This is because the diameter is reduced or the equiaxed crystal ratio is increased to reduce the size and dispersion of the center porosity, thereby facilitating the pressing of the center porosity.
【0011】また、連続鋳造鋳片の凝固未期又は凝固完
了直後にセンターポロシティの圧下を行うのは、鋳片の
外側の変形抵抗が大きく中心付近の変形抵抗が小さいこ
の状態が、小さい圧下力でセンターポロシティの圧着を
行う上で最も有利だからである。In addition, the reduction of the center porosity of the continuous cast slab before or immediately after the solidification is performed is that the deformation resistance outside the slab is large and the deformation resistance near the center is small. This is because this is the most advantageous in performing center porosity crimping.
【0012】本発明において軽圧下の条件は、ある程度
の中心偏析の軽減とセンターポロシティの小サイズ化・
分散化ができればよく、そのために、鋳片中心部の温度
が固相率0.05〜0.7に相当する鋳片位置で、鋳片
を4〜20mm圧下すればよい。In the present invention, the conditions under light pressure are to reduce the center segregation to some extent and to reduce the size of the center porosity.
What is necessary is just to be able to disperse | distribute, for that purpose, it is good to reduce the slab by 4 to 20 mm at the slab position where the temperature of the slab center part corresponds to the solid phase ratio of 0.05 to 0.7.
【0013】軽圧下の位置を鋳片中心部の温度が固相率
0.05〜0.7に相当する位置にする理由は、この範
囲外では軽圧下の効果が著しく低下するためである。ま
た、圧下量を4〜20mmとするのは、圧下量が4mm以下
では、軽圧下の本来の目的である凝固収縮の補償を行う
上で不十分であり、圧下量が20mm以上では、内部割れ
が発生するおそれがあるためである。The reason why the position of the light reduction is set to a position where the temperature at the center of the slab corresponds to the solid phase ratio of 0.05 to 0.7 is that the effect of the light reduction is significantly reduced outside this range. In addition, the reduction amount of 4 to 20 mm is insufficient when the reduction amount is 4 mm or less to compensate for the solidification shrinkage, which is the original purpose of the light reduction, and when the reduction amount is 20 mm or more, the internal cracks are reduced. This is because there is a risk of occurrence.
【0014】なお、軽圧下の方法として中心偏析の軽減
を理想的に行うという観点からは、例えば後の実施例に
示すような、鋳片中心部の温度が固相率0.05〜0.
25に相当する位置で圧下勾配0.2〜3.0mm/mの
第1段の軽圧下を行い、さらに固相率0.25〜0.6
に相当する位置で全圧下量4〜20mmの第2段の圧下を
行うような方法が好ましい。From the viewpoint of ideally reducing center segregation as a method under light pressure, for example, the temperature at the center of the slab is 0.05 to 0.
At the position corresponding to 25, a first step of light reduction with a reduction gradient of 0.2 to 3.0 mm / m, and a solid phase ratio of 0.25 to 0.6
It is preferable to perform a second-stage reduction with a total reduction amount of 4 to 20 mm at a position corresponding to the following.
【0015】なお、本発明における固相率は、鋳片の中
心部温度Tの関数として、次式で定義されるものであ
る。 固相率=(Tl−T)/(Tl−Ts) ここで、Tl:溶鋼の液相線温度(℃) Ts:溶鋼の固相線温度(℃) T :鋳片の中心部温度(℃) である。The solid fraction in the present invention is defined by the following equation as a function of the temperature T at the center of the slab. Solid phase ratio = (T 1 −T) / (T 1 −T s ) where T l : liquidus temperature of molten steel (° C.) T s : solidus temperature of molten steel (° C.) T: cast slab It is the center temperature (° C).
【0016】鋳片の中心部温度Tは、冷却条件や鋳造速
度等の操業条件により予め計算することができる。した
がって、固相率は鋳造速度、冷却条件、鋳片サイズ、鋼
種が決まれば、特開平2−303661号公報に示すご
とく凝固時間の関数であり、同じ凝固時間の関数である
シェル厚、未凝固厚、未凝固率等に容易に換算すること
ができる。The center temperature T of the slab can be calculated in advance by operating conditions such as cooling conditions and casting speed. Therefore, the solid phase ratio is a function of the solidification time as shown in JP-A-2-303661, if the casting speed, cooling conditions, slab size, and steel type are determined. It can be easily converted to thickness, unsolidified rate, etc.
【0017】本発明において、センターポロシティ軽減
のための圧下は、鋳片中心部の温度が固相率0.8以上
の鋳片位置において、圧下率5〜20%の範囲内で行う
ことを特徴とする。すなわち、図1のセンターポロシテ
ィ圧下用ロール4は、標準的な操業条件(とくに標準的
な鋳造速度)において、固相率が0.8以上になる位置
に設置する。In the present invention, the reduction for reducing the center porosity is performed at a slab position where the temperature of the slab center is 0.8% or more of the solid fraction and a reduction ratio of 5 to 20%. And That is, the center porosity reduction roll 4 in FIG. 1 is installed at a position where the solid fraction is 0.8 or more under standard operating conditions (particularly, standard casting speed).
【0018】固相率が0.8未満の位置で、鋳片に大き
な圧下を加えると、鋳片中心部の溶鋼が流動して中心偏
析が悪化するが、固相率が0.8以上の位置では中心偏
析の悪化がなく、センターポロシティの圧着のみが有効
に行われるためである。When a large reduction is applied to the slab at a position where the solid fraction is less than 0.8, the molten steel at the center of the slab flows to deteriorate the center segregation. This is because, at the position, the center segregation does not deteriorate, and only the pressing of the center porosity is effectively performed.
【0019】また、この時の圧下率を5〜20%の範囲
とする理由は、5%未満ではセンターポロシティの圧着
効果が不十分であり、圧下率が20%を超えても、セン
ターポロシティの圧着効果は頭打ちとなり、圧下装置の
負荷が増すだけだからである。The reason for setting the rolling reduction at this time in the range of 5 to 20% is that if the rolling reduction is less than 5%, the pressing effect of the center porosity is insufficient, and even if the rolling reduction exceeds 20%, the center porosity cannot be reduced. This is because the crimping effect reaches a plateau and only increases the load on the screw-down device.
【0020】センターポロシティ圧下用ロールでの適正
な圧下率は、圧下前のセンターポロシティのサイズや分
散状況、従って軽圧下の条件に依存する。The appropriate reduction rate of the center porosity reduction roll depends on the size and dispersion state of the center porosity before the reduction, and therefore, the condition of the light reduction.
【0021】軽圧下の効果が最も大きい鋳片位置、例え
ば中心部の温度が固相率0.5〜0.7に相当する位置
で、適正な軽圧下が行われた場合には、センターポロシ
ティのサイズは小さくかつ一様に分散しているため、セ
ンターポロシティ圧下用ロールでは5〜10%程度の圧
下率で圧下すれば、センターポロシティは十分圧着が可
能である。When an appropriate light reduction is performed at the position of the slab where the effect of the light reduction is the greatest, for example, at a position where the temperature at the center corresponds to the solid phase ratio of 0.5 to 0.7, the center porosity is reduced. Are small and uniformly dispersed, so that the center porosity can be sufficiently pressed by reducing the center porosity with a reduction ratio of about 5 to 10%.
【0022】一方、軽圧下の条件が上記以外の場合に
は、センターポロシティのサイズが大きく、かつ局部偏
在することがあるので20%近い圧下率が必要となる。On the other hand, when the condition of the light reduction is other than the above, the size of the center porosity is large and the local porosity may be locally uneven, so that a reduction ratio close to 20% is required.
【0023】また、センターポロシティ圧下用ロール
は、中心固相率が1.0以下の位置に設置することが好
ましい。鋳片の中心固相率が1.0以上になると、鋳片
の温度の低下により変形抵抗が急激に増加して圧下効率
が悪くなり、中心部が有効に圧下されないおそれがある
ためである。The center porosity reduction roll is preferably installed at a position where the center solid phase ratio is 1.0 or less. If the center solid phase ratio of the slab becomes 1.0 or more, the deformation resistance sharply increases due to a decrease in the temperature of the slab, and the rolling efficiency becomes poor, and the center portion may not be effectively lowered.
【0024】本発明の方法は、鋳片厚みが50〜300
mm程度の連続鋳造スラブに適用することができ、とくに
薄手スラブから厚板材を製造するような場合に、鋳片段
階でセンターポロシテイの圧下を行うことが、製品欠陥
を低減する上で有効になる。In the method of the present invention, the slab thickness is 50 to 300.
It can be applied to continuous cast slabs of about mm, especially when manufacturing thick plates from thin slabs, reducing the center porosity at the slab stage is an effective way to reduce product defects. Become.
【0025】[0025]
【実施例】本発明の連続鋳造法の試験を実施した連鋳機
の概要を図2に示す。図2の圧下帯に、図1に示すよう
な軽圧下用ロールとセンターポロシティ圧下用ロールを
設置して試験を行った。鋳造した溶鋼組成の代表例を表
1に示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 shows an outline of a continuous casting machine which has been subjected to a test of the continuous casting method of the present invention. A test was performed by installing a light reduction roll and a center porosity reduction roll as shown in FIG. 1 in the reduction zone of FIG. Table 1 shows typical examples of the composition of the molten steel that was cast.
【0026】[0026]
【表1】 [Table 1]
【0027】鋳片の断面サイズは厚み150〜300m
m、幅900〜2500mmの範囲内で試験を行い、鋳造
速度は0.65〜0.7m/分を標準とし、0.55〜
0.75m/分の範囲で試験を行った。The section size of the slab is 150 to 300 m in thickness.
m, a test was conducted within the range of 900 to 2500 mm in width, and the casting speed was set to 0.65 to 0.7 m / min as a standard,
The test was performed in the range of 0.75 m / min.
【0028】実施例、比較例共に、中心偏析の軽減に有
効と考えられる二段の軽圧下を行った。すなわち、まず
鋳片中心の温度が固相率0.05〜0.25に相当する
位置で圧下勾配1mm/mの第1段の軽圧下を行い、さら
に固相率0.25〜0.6に相当する位置で全圧下量1
6mm(圧下勾配1.8mm/分)で第2段の軽圧下を行っ
た。In both the examples and comparative examples, two-stage light reduction considered to be effective in reducing center segregation was performed. That is, first, the first stage of the first step is performed at a position where the temperature at the center of the slab corresponds to the solid phase ratio of 0.05 to 0.25, with a reduction gradient of 1 mm / m. At the position corresponding to
The second stage of light reduction was performed at 6 mm (a reduction gradient of 1.8 mm / min).
【0029】実施例は上記の軽圧下に加えて、センター
ポロシティの圧下を行った場合で、比較例は軽圧下のみ
で、センターポロシティの圧下がない場合である。In the embodiment, the center porosity is reduced in addition to the above-described light reduction, and the comparative example is the case where the center porosity is not reduced and the center porosity is reduced.
【0030】センターポロシティの圧下の条件として
は、鋳造速度が0.65〜0.7m/分の場合は、中心
固相率0.8の位置で5%及び中心固相率1.0の位置
で5%、合計10%の圧下を行った。また、鋳造速度が
0.55〜0.75m/分の範囲で変動した場合にも、
中心固相率0.8〜1.0の位置で合計20%以内の圧
下が加えられるようにした。As the conditions for the reduction of the center porosity, when the casting speed is 0.65 to 0.7 m / min, the position of the center solid fraction of 0.8 is 5% and the position of the center solid fraction is 1.0. 5%, for a total of 10% reduction. Also, when the casting speed fluctuates in the range of 0.55 to 0.75 m / min,
A total reduction of 20% or less was applied at the position of the central solid phase ratio of 0.8 to 1.0.
【0031】図3に、実施例及び比較例における鋳片の
センターポロシティ体積率の比較を示す。図に見られる
ように、実施例では鋳造速度が0.65〜0.7m/分
では、センターポロシティ体積率はほぼ0となってお
り、鋳造速度が変動した場合でも体積率はほぼ1%以下
であった。これに対して比較例では、センターポロシテ
ィ体積率は0.5〜2.0%の範囲であり、本発明の方
法によるセンターポロシティ圧下の効果が確かめられ
た。FIG. 3 shows a comparison of the center porosity volume ratios of the slabs in the example and the comparative example. As can be seen from the figure, in the example, when the casting speed is 0.65 to 0.7 m / min, the center porosity volume ratio is almost 0, and even when the casting speed varies, the volume ratio is approximately 1% or less. Met. On the other hand, in the comparative example, the center porosity volume ratio was in the range of 0.5 to 2.0%, and the effect of reducing the center porosity by the method of the present invention was confirmed.
【0032】[0032]
【発明の効果】本発明の方法で、連続鋳造鋳片の凝固末
期に軽圧下とセンターポロシティの圧下を組合せて行う
ことにより、鋳片の割れや中心偏析の悪化を伴うことな
く、センターポロシティを大幅に低減することが可能と
なった。According to the method of the present invention, the center porosity can be reduced without causing cracks in the slab and deterioration of center segregation by performing a combination of light reduction and center porosity reduction at the end of solidification of the continuous cast slab. It became possible to greatly reduce.
【図1】本発明における圧下ロールの配置例を示す模式
図。FIG. 1 is a schematic view showing an example of the arrangement of a pressing roll in the present invention.
【図2】本発明の試験を実施した連鋳機の概要を示す
図。FIG. 2 is a diagram showing an outline of a continuous caster on which a test of the present invention has been performed.
【図3】実施例及び比較例における鋳片のセンターポロ
シティ体積率の比較を示す図。FIG. 3 is a diagram showing a comparison of a center porosity volume ratio of a slab in an example and a comparative example.
1 鋳片 2 未凝固部分 3 軽圧下用ロール 4 センターポロシティ圧下用ロール DESCRIPTION OF SYMBOLS 1 Cast piece 2 Unsolidified part 3 Roll for light reduction 4 Roll for center porosity reduction
Claims (1)
融金属の連続鋳造法において、鋳片中心部の温度が固相
率0.05〜0.7に相当する鋳片位置に少なくとも一
対のロールを設置して鋳片を4〜20mm圧下すると共
に、鋳片中心部の温度が固相率0.8以上の鋳片位置に
少なくとも一対のロールを設置して5〜20%の圧下率
で鋳片を圧下することを特徴とする、センターポロシテ
ィを軽減する連続鋳造法。In a continuous casting method of a molten metal in which a slab is drawn down while being pressed before solidification, at least a pair of slab positions are located at a slab position where a temperature of a slab center portion corresponds to a solid phase ratio of 0.05 to 0.7. Rolls are set to reduce the slab by 4 to 20 mm, and at least a pair of rolls are set at a slab position where the temperature of the slab center is 0.8% or more of the solid phase ratio, and the reduction rate is 5 to 20%. A continuous casting method that reduces center porosity by rolling down the slab.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22371396A JPH1058106A (en) | 1996-08-26 | 1996-08-26 | Continuous casting method reducing center porosity |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22371396A JPH1058106A (en) | 1996-08-26 | 1996-08-26 | Continuous casting method reducing center porosity |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH1058106A true JPH1058106A (en) | 1998-03-03 |
Family
ID=16802509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22371396A Withdrawn JPH1058106A (en) | 1996-08-26 | 1996-08-26 | Continuous casting method reducing center porosity |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH1058106A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006289438A (en) * | 2005-04-11 | 2006-10-26 | Kobe Steel Ltd | Method for producing steel material |
JP2006341297A (en) * | 2005-06-10 | 2006-12-21 | Sumitomo Metal Ind Ltd | Continuous casting method, and continuously cast slab |
JP2007136496A (en) * | 2005-11-17 | 2007-06-07 | Sumitomo Metal Ind Ltd | Continuous casting method and continuously cast slab |
JP2007237197A (en) * | 2006-03-06 | 2007-09-20 | Kobe Steel Ltd | Continuous casting method |
JP2009255173A (en) * | 2008-03-26 | 2009-11-05 | Kobe Steel Ltd | Continuous casting equipment for steel |
JP2010227941A (en) * | 2009-03-25 | 2010-10-14 | Kobe Steel Ltd | Continuous casting facility for steel |
-
1996
- 1996-08-26 JP JP22371396A patent/JPH1058106A/en not_active Withdrawn
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006289438A (en) * | 2005-04-11 | 2006-10-26 | Kobe Steel Ltd | Method for producing steel material |
JP2006341297A (en) * | 2005-06-10 | 2006-12-21 | Sumitomo Metal Ind Ltd | Continuous casting method, and continuously cast slab |
JP4548231B2 (en) * | 2005-06-10 | 2010-09-22 | 住友金属工業株式会社 | Steel continuous casting method and continuous cast slab |
JP2007136496A (en) * | 2005-11-17 | 2007-06-07 | Sumitomo Metal Ind Ltd | Continuous casting method and continuously cast slab |
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 |
JP2007237197A (en) * | 2006-03-06 | 2007-09-20 | Kobe Steel Ltd | Continuous casting method |
JP2009255173A (en) * | 2008-03-26 | 2009-11-05 | Kobe Steel Ltd | Continuous casting equipment for steel |
JP2010227941A (en) * | 2009-03-25 | 2010-10-14 | Kobe Steel Ltd | Continuous casting facility for steel |
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Legal Events
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A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20031104 |