JP5129253B2 - Steel strip production process - Google Patents
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- JP5129253B2 JP5129253B2 JP2009528610A JP2009528610A JP5129253B2 JP 5129253 B2 JP5129253 B2 JP 5129253B2 JP 2009528610 A JP2009528610 A JP 2009528610A JP 2009528610 A JP2009528610 A JP 2009528610A JP 5129253 B2 JP5129253 B2 JP 5129253B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
Description
本発明は、少なくとも２つの鋳造ロールと、必要に応じて、横方向に配置された側部プレートとを使用する鋼ストリップの連続生産のためのプロセスに関し、このプロセスにおいては、操業中には液状の鋼溶融物を鋳造ロールに導入することが出来る鋳造溶湯貯蔵部を鋳造ロールと側部プレートとの間に形成することが出来る。 The present invention relates to a process for the continuous production of steel strips using at least two casting rolls and, if necessary, laterally arranged side plates, in this process a liquid during operation. A cast molten metal storage part capable of introducing the steel melt into the casting roll can be formed between the casting roll and the side plate.
低炭素濃度の、Ｍｎ／Ｓｉセミキルド鋼溶融物からの鋼ストリップの生産中に、従来技術から既知である２つの鋳造プロセスが使用される場合には、生産された鋼ストリップは、この生産された鋼ストリップの品質を大幅に低下させる多くの割れ及び表面欠陥を有している。 During the production of steel strips from low carbon concentration, Mn / Si semi-killed steel melts, if two casting processes known from the prior art are used, the produced steel strips were produced It has many cracks and surface defects that greatly reduce the quality of the steel strip.
液状非金属介在物が鋼溶融物中に生じ、これら介在物が鋼のシェルの凝固中に液状のままに維持されて均一な熱流とこれによる均一な冷却効果が鋳造ロールの表面に液体フィルムを形成することによって達成されるように、鋼溶融物の組成を選択することによって割れ及び表面欠陥を防止するか、又は少なくとも割れ及び表面欠陥の数を減少させることが、特許文献１及び特許文献２によって既知となっている。 Liquid non-metallic inclusions occur in the steel melt, and these inclusions remain liquid during the solidification of the steel shell so that a uniform heat flow and a uniform cooling effect thereby create a liquid film on the surface of the casting roll. Preventing cracks and surface defects by selecting the composition of the steel melt, or at least reducing the number of cracks and surface defects, as achieved by forming, is described in US Pat. Is known by
工業的規模での溶融操業中には、操業に係る複数の理由のために、Ｍｎ／Ｓｉセミキルド鋼溶融物中に実際に存在するＭｎＯ／ＳｉＯ２の比は、理論的に計算されたＭｎＯ／ＳｉＯ２の比より実質的に低いことが多い。Ｍｎ／Ｓｉセミキルド鋼溶融物中の非金属介在物の溶融温度は、鋼組成の変化及び関連する前記介在物の組成におけるＭｎＯ／ＳｉＯ２の比の変化に非常に敏感である。したがって、液状の非金属介在物の生成に対する、従来技術において特定される金属学法則に従う場合、工業的規模での溶融操業中に、扱われるレードルそれぞれが、液状の非金属介在物が鋳造プロセス中に存在することを確実とする組成を有していることを仮定することは出来ない。よって、割れ及び表面欠陥が再現してしまう場合がある。 During melting operations on an industrial scale, the MnO / SiO 2 ratio actually present in the Mn / Si semi-killed steel melt is due to a number of operational reasons, the theoretically calculated MnO / Often substantially lower than the ratio of SiO 2 . The melting temperature of the non-metallic inclusions in the Mn / Si semi-killed steel melt is very sensitive to changes in the steel composition and the related MnO / SiO 2 ratio in the inclusion composition. Thus, when following the metallurgical rules specified in the prior art for the production of liquid non-metallic inclusions, during the melting operation on an industrial scale, each handled raddle has liquid non-metallic inclusions in the casting process. It cannot be assumed that it has a composition that ensures it exists. Therefore, cracks and surface defects may be reproduced.
本発明の目的は、これら従来技術の既知の欠点を回避すること、及び低炭素濃度の、Ｍｎ／Ｓｉセミキルド鋼溶融物から、割れ及び表面欠陥が殆ど無く、均一な表面を有する鋼ストリップを生産するためのプロセスを提供することである。このプロセスにおいては、鋼組成の望ましい値からのずれに対する非金属介在物の溶融温度の振れ幅は、工業的規模の溶融操業中の鋳造プロセス中、液状の非金属介在物が、扱われるレードルそれぞれの中に存在することを確実とするのに十分でなければならない。 The object of the present invention is to avoid these known drawbacks of the prior art and to produce steel strips with a uniform surface with few cracks and surface defects from a low carbon concentration, Mn / Si semi-killed steel melt. Is to provide a process for In this process, the variation in melting temperature of nonmetallic inclusions with respect to deviation from the desired value of the steel composition is such that during the casting process during an industrial scale melting operation, liquid nonmetallic inclusions are handled in each ladle handled. It must be enough to ensure that it exists within.
本発明によれば、本発明の目的は、通常の操業中において、特定のロール離隔力（ＲＳＦ：ｒｏｌｌ ｓｅｐａｒａｔｉｎｇ ｆｏｒｃｅ）を使用して、特定のＭｎ／Ｓｉ含有量比、及び特定の硫黄含有量を有する鋼溶融物が処理されるプロセスによって達成される。 According to the present invention, the object of the present invention is to use a specific roll separating force (RSF), a specific Mn / Si content ratio, and a specific sulfur content during normal operation. Achieved by a process in which a steel melt having
したがって、本発明は、低炭素濃度の、Ｍｎ／Ｓｉセミキルド鋼ストリップを生産するためのプロセスであって、鋼溶融物が、少なくとも２つの鋳造ロールの間の溶湯貯蔵部から導入され、冷却されるとともに鋼ストリップとともに移動し、鋳造ロール上において少なくとも部分的に凝固して鋼ストリップを形成するプロセスにおいて、鋼溶融物が、２０〜３００ｐｐｍの硫黄濃度と、３．５以上のＭｎ／Ｓｉ比とを有し、通常の操業中にロール離隔力が２〜５０ｋＮ／ｍであることを特徴としている。 Accordingly, the present invention is a process for producing a low carbon concentration, Mn / Si semi-killed steel strip wherein the steel melt is introduced and cooled from a melt reservoir between at least two casting rolls. In the process of moving together with the steel strip and at least partially solidifying on the casting roll to form the steel strip, the steel melt has a sulfur concentration of 20-300 ppm and a Mn / Si ratio of 3.5 or more. And the roll separation force is 2 to 50 kN / m during normal operation.
このように生産された鋼ストリップは、思いがけなく大幅に割れ及び表面欠陥が少なく、均一な表面を有している。 The steel strip produced in this way has a uniform surface with unexpectedly significantly less cracking and surface defects.
低炭素濃度鋼ストリップが、０．１重量％未満の炭素濃度を有する鋼ストリップを意味することが理解されるべきである。 It should be understood that a low carbon steel strip means a steel strip having a carbon concentration of less than 0.1% by weight.
本発明による鋼溶融物の組成は、非金属介在物が低い溶融温度を有することを確実とする。低い溶融温度は、鋳造プロセス中の鋳造ロール上の鋼シェルの凝固中に非金属介在物が液状で存在するという効果を有する。鋼組成の望ましい値からのずれに対する非金属介在物の溶融温度の振れ幅は、液状の非金属介在物が多相システム中に存在する組成範囲が広がることによって増加する。この広がった組成範囲は、特定の鋼組成に対する望ましい値が工業的規模の溶融操業中に正確に合致していない場合でさえ、鋼溶融物が、鋳造プロセス中の液状非金属介在物を保証する組成を有するということを確実にする。 The composition of the steel melt according to the invention ensures that the nonmetallic inclusions have a low melting temperature. The low melting temperature has the effect that non-metallic inclusions are present in liquid form during solidification of the steel shell on the casting roll during the casting process. The fluctuation range of the melting temperature of the nonmetallic inclusion with respect to the deviation from the desired value of the steel composition is increased by increasing the composition range in which the liquid nonmetallic inclusion exists in the multiphase system. This extended composition range ensures that the steel melt is a liquid non-metallic inclusion during the casting process, even if the desired values for a particular steel composition do not exactly match during an industrial scale melt operation. Ensure that it has a composition.
鋼の準備の間に、酸化物又は硫化物の非金属介在物が鋼溶融物中に生じる。Ｍｎ／Ｓｉセミキルド鋼溶融物における非金属介在物の主な成分は、ＭｎＯ及びＳｉＯ２である。 During the preparation of the steel, non-metallic inclusions of oxides or sulfides are formed in the steel melt. The main components of the non-metallic inclusions in the Mn / Si Semikirudo steel melt is MnO and SiO 2.
本発明によれば、硫黄の含有量を２０〜３００ｐｐｍの値に設定し、Ｍｎ／Ｓｉ比を３．５以上に設定することは、非金属介在物が、主成分ＭｎＯ−ＳｉＯ２−ＭｎＳを有する多相システムから本質的に構成されるという効果を有する。この多相システムのＭｎＳ含有量が３７重量％ＭｎＳ未満である場合には、多相システムの溶融温度は、主成分がＭｎＯ及びＳｉＯ２からなる多相システムの溶融温度より低い。ＭｎＯ−ＳｉＯ２−ＭｎＳの３相システムは、約１１３０℃に３元共晶温度を有する。 According to the present invention, setting the sulfur content to a value of 20 to 300 ppm and setting the Mn / Si ratio to 3.5 or more means that the non-metallic inclusions contain the main component MnO—SiO 2 —MnS. It has the effect of consisting essentially of a multiphase system. If this MnS content of the multiphase system is less than 37 wt% MnS, the melt temperature of the multiphase system is less than the melting temperature of the multiphase system consisting of MnO and SiO 2 principal components. The MnO—SiO 2 —MnS three-phase system has a ternary eutectic temperature of about 1130 ° C.
図１の３元システムＭｎＯ−ＳｉＯ２−ＭｎＳのモデリングは、液相範囲が、共晶点において２相システムＭｎＯ−ＳｉＯ２の１２５１℃の共晶温度での２相システムＭｎＯ−ＳｉＯ２の境界に合致し、ＭｎＳ濃度が増加するにつれて３元システムへの遷移の間に広がる、ということを示している。より低い温度では、液相線範囲は境界システムから離れる方向へ動き、依然として所定の最小のＭｎＳ濃度の上にのみ見ることが出来る。 Ternary system MnO-SiO 2-MnS modeling of Figure 1, the liquid phase ranges, a two-phase system MnO-SiO 2 in the boundary of the eutectic temperature of 1251 ° C. for 2-phase system MnO-SiO 2 in a eutectic point And shows that it spreads during the transition to the ternary system as the MnS concentration increases. At lower temperatures, the liquidus range moves away from the boundary system and can still be seen only above a certain minimum MnS concentration.
非金属介在物の低い溶融温度と工業的規模における溶融操業中において十分であるＭｎＳ濃度での変動に対する溶融温度の振れ幅とを同時に有する通常の操業点は、本発明による鋼溶融物の組成の場合には、約１５重量％ＭｎＳである。 The normal operating point having simultaneously the low melting temperature of non-metallic inclusions and the fluctuation of the melting temperature for fluctuations in the MnS concentration which is sufficient during the melting operation on an industrial scale is the composition of the steel melt according to the invention. In some cases, it is about 15% by weight MnS.
不活性ガス中での浸漬試験と、ストリップの鋳造に対応する接触時間及び過熱レベルとを使用した、１５０〜５００ｐｐｍの鋼溶融物の硫黄濃度を有する薄いストリップの鋳造設備における凝固条件のシミュレーションでは、７〜４０重量％の液状非金属介在物の平均ＭｎＳ濃度であった。Ｍｎ／Ｓｉセミキルド鋼溶融物の硫黄濃度の増加は、非金属介在物のＭｎＳ濃度を増加させる。 In the simulation of solidification conditions in a thin strip casting facility with a steel melt sulfur concentration of 150-500 ppm, using an immersion test in inert gas and a contact time and superheat level corresponding to the casting of the strip, The average MnS concentration of the liquid nonmetallic inclusions was 7 to 40% by weight. Increasing the sulfur concentration of the Mn / Si semi-killed steel melt increases the MnS concentration of non-metallic inclusions.
図２は、３．５以上のＭｎ／Ｓｉ比を有する、低炭素濃度の、Ｍｎ／Ｓｉセミキルド鋼溶融物（Ｃ：０．０５重量％、Ｍｎ：０．３重量％、Ｓｉ：０．２重量％）の割れの傾向に対する影響を、非金属介在物の組成及び非金属介在物の溶融温度（液相線温度）に対して、割れの頻度又は鋼溶融物の溶融温度間隔によって表わした図である。図２における測定されたデータは、上述の浸漬試験から得られている。 FIG. 2 shows a low carbon concentration, Mn / Si semi-killed steel melt (C: 0.05 wt%, Mn: 0.3 wt%, Si: 0.2 wt%) with a Mn / Si ratio of 3.5 or higher. (% By weight) The effect of cracking tendency on the composition of nonmetallic inclusions and the melting temperature (liquidus temperature) of nonmetallic inclusions by the frequency of cracking or the melting temperature interval of the steel melt It is. The measured data in FIG. 2 is obtained from the immersion test described above.
約１１３０℃における３元共晶点に対応する、非金属介在物のＭｎＳ濃度を生じさせる溶融物の硫黄濃度以下では、非金属介在物の溶融温度は硫黄濃度の増加に伴って低下する。 Below the sulfur concentration of the melt that produces a MnS concentration of nonmetallic inclusions, corresponding to a ternary eutectic point at about 1130 ° C., the melting temperature of the nonmetallic inclusions decreases with increasing sulfur concentration.
約１１３０℃における３元共晶に対応する非金属介在物のＭｎＳ濃度を生じさせる硫黄濃度より上では、非金属介在物の溶融温度及び割れの頻度は急速に増加する。 Above the sulfur concentration that results in the MnS concentration of the nonmetallic inclusions corresponding to the ternary eutectic at about 1130 ° C., the melting temperature of the nonmetallic inclusions and the frequency of cracking increase rapidly.
溶融温度の間隔の幅は、約３００ｐｐｍの硫黄濃度まで増加し、次いでほぼ一定となる。 The width of the melting temperature interval increases to a sulfur concentration of about 300 ppm and then becomes nearly constant.
図２は、熱間割れにいたる傾向の増加と非金属介在物の溶融温度の降下との間の相対的な挙動を示している。したがって、本発明によって推奨され、非金属介在物の十分に低い溶融温度であって、同時に熱間割れの許容できる傾向を有する硫黄濃度は、図２から見出すことが出来る。鋼合金中の硫黄の存在は、鋼合金の固相／液相の２相領域、すなわち溶融間隔を広げ、同時にその固相線温度を降下させ、このことが、熱間割れが液体非侵入温度（ＬＩＴ：ｌｉｑｕｉｄ ｉｍｐｅｎｅｔｒａｔｉｏｎ ｔｅｍｐｅｒａｔｕｒｅ）と延性を示さない温度（ＺＤＴ： ｚｅｒｏ ｄｕｃｔｉｌｉｔｙ ｔｅｍｐｅｒａｔｕｒｅ）との間において生じる温度範囲を広げる。 FIG. 2 shows the relative behavior between increasing tendency to hot cracking and decreasing melting temperature of non-metallic inclusions. Therefore, the sulfur concentration recommended by the present invention and having a sufficiently low melting temperature of non-metallic inclusions and at the same time having an acceptable tendency to hot cracking can be found from FIG. The presence of sulfur in the steel alloy increases the two-phase region of the solid / liquid phase of the steel alloy, i.e. widens the melting interval and at the same time lowers its solidus temperature. The temperature range generated between (LIT: liquid impermeation temperature) and a temperature not exhibiting ductility (ZDT: zero ductility temperature) is expanded.
２相領域の幅は、鋼溶融物中の３００ｐｐｍまでの硫黄濃度において、約４５℃までほぼ直線的に増加する。この硫黄濃度より高い硫黄濃度では、ＭｎＳが凝固中に硫黄濃度の増加とともに析出するので、２相領域の幅はほぼ一定に維持される。これらＭｎＳ析出物は、鋳造ロールの表面に固体形状で堆積し、よって均一な熱流又は均一な冷却効果を妨げ、これが表面欠陥及び割れの形成を促進する。鋼溶融物の硫黄濃度の増加は、ＭｎＳ析出物の量を増加させ、よって表面欠陥及び割れの数を増加させる。 The width of the two-phase region increases almost linearly to about 45 ° C. at sulfur concentrations up to 300 ppm in the steel melt. At a sulfur concentration higher than this sulfur concentration, MnS precipitates with increasing sulfur concentration during solidification, so the width of the two-phase region is maintained approximately constant. These MnS deposits are deposited in solid form on the surface of the casting roll, thus hindering uniform heat flow or uniform cooling effects, which promote the formation of surface defects and cracks. Increasing the sulfur concentration of the steel melt increases the amount of MnS precipitates and thus increases the number of surface defects and cracks.
したがって、本発明によれば、最大硫黄濃度は３００ｐｐｍに制限される。 Therefore, according to the present invention, the maximum sulfur concentration is limited to 300 ppm.
鋼溶融物の２０ｐｐｍ未満の硫黄濃度においては、主成分ＭｎＯ及びＳｉＯ２からなる多相システムに比較した液状非金属介在物の溶融温度は、液状非金属介在物が、鋳造プロセス中に鋳造ロール上の鋼シェルの凝固中に存在することを確実にするほどには十分に高くない。 At a sulfur concentration of less than 20 ppm in the steel melt, the melting temperature of the liquid non-metallic inclusions compared to the multiphase system consisting of the main components MnO and SiO 2 is such that the liquid non-metallic inclusions on the casting roll during the casting process It is not high enough to ensure that it is present during solidification of the steel shell.
さらに、２０ｐｐｍより少ない硫黄濃度においては、液状非金属介在物が多相システム中に存在する組成領域の幅は、工業的規模での溶融操業中の鋼組成の望ましい値からのずれに対する十分な許容範囲が存在することを確実にするほどには大きくない。 In addition, at sulfur concentrations below 20 ppm, the width of the composition region where liquid non-metallic inclusions are present in the multiphase system is sufficiently tolerant of deviations from the desired value of the steel composition during melting operations on an industrial scale. Not large enough to ensure that a range exists.
硫黄濃度は好ましくは少なくとも５０ｐｐｍであり、特に好ましくは少なくとも７０ｐｐｍである。硫黄濃度の上限は好ましくは２５０ｐｐｍであり、特に好ましくは２００ｐｐｍである。鋼溶融物の硫黄濃度は、脱硫若しくは制御された硫黄又は硫黄化合物の添加によって望ましいレベルに調整することが出来る。 The sulfur concentration is preferably at least 50 ppm, particularly preferably at least 70 ppm. The upper limit of the sulfur concentration is preferably 250 ppm, particularly preferably 200 ppm. The sulfur concentration of the steel melt can be adjusted to the desired level by desulfurization or the addition of controlled sulfur or sulfur compounds.
鋼溶融物における３．５未満のＭｎ／Ｓｉ比において、主成分ＭｎＯ−ＳｉＯ２−ＭｎＳからなり、主成分ＭｎＯ及びＳｉＯ２からなる多相システムに比較して、鋼混合物の溶融温度より低い値までの液状非金属介在物の溶融温度の低下を有する、多相システムが形成されることは無い。したがって本発明によれば、Ｍｎ／Ｓｉ比は３．５以上である必要がある。 A value lower than the melting temperature of the steel mixture compared to a multiphase system consisting of the main components MnO—SiO 2 —MnS and consisting of the main components MnO and SiO 2 at a Mn / Si ratio of less than 3.5 in the steel melt. No multiphase system is formed with a reduction in the melting temperature of liquid non-metallic inclusions up to. Therefore, according to the present invention, the Mn / Si ratio needs to be 3.5 or more.
ロール離隔力は、鋳造ロールが鋳造プロセス中において互いに対して押圧する力であり、鋼ストリップの幅に依存している。ロール離隔力は、鋼ストリップ中の割れ及び表面欠陥の存在に影響する。 The roll separation force is the force with which the casting rolls press against each other during the casting process and depends on the width of the steel strip. The roll separation force affects the presence of cracks and surface defects in the steel strip.
ロール離隔力が大きければ大きいほど、鋼のシェルのキッシングポイント（ｋｉｓｓｉｎｇ ｐｏｉｎｔ）において生じる温度の不均一性は大きくなる。このタイプの温度の不均一性は、鋼ストリップの不均一な冷却を引き起こし、これが表面割れをもたらす。さらに、大きなロール離隔力は、応力がストリップ鋳造された鋼ストリップ中に生じ、この応力が又割れを引き起こし、機械的な特性を損なう。 The greater the roll separation force, the greater the temperature non-uniformity that occurs at the steel shell kissing point. This type of temperature non-uniformity causes non-uniform cooling of the steel strip, which results in surface cracking. In addition, large roll separation forces occur in the strip cast steel strip, which also causes cracking and impairs mechanical properties.
小さなロール離隔力の使用はこれら問題を回避し、さらに、鋳造装置が殆ど機械的応力を受けることが無いという利点を付与する。しかし、小さいロール離隔力の選択は、逆に鋳造プロセスの安定性に影響を及ぼす。これは、小さいロール離隔力の場合には鋳造ロール上の凝固した金属シェルが凝固中の不均一性の故に十分に押し圧されず、鋼ストリップがそれ自身の重さの下で割れを生じる危険、鋼シェルが鋳造ロールの幅の一部分又は全体に付着したままとなる危険、及び、割れが鋼シェル中に生じる危険があるからである。 The use of a small roll separation force avoids these problems and further provides the advantage that the casting apparatus is hardly subjected to mechanical stress. However, the selection of a small roll separation force adversely affects the stability of the casting process. This means that in the case of small roll separation forces, the solidified metal shell on the casting roll is not fully pressed due to non-uniformity during solidification, and the steel strip may crack under its own weight. This is because there is a risk that the steel shell will remain attached to part or all of the width of the casting roll and there is a risk that cracks will occur in the steel shell.
従来技術によるプロセスにおいては、ロール離隔力の大きさは、通常の操業中には、５〜２５０ｋＮ／ｍである。 In the prior art process, the magnitude of the roll separation force is 5 to 250 kN / m during normal operation.
本発明によれば、ロール離隔力は５０ｋＮ／ｍ未満である。本発明による鋼溶融物の組成が、鋼シェルの凝固中に液状の非金属介在物が生じることを確実にするという事実によって非均一性の発生を最小化するので、このような小さなロール離隔力を、鋳造プロセスの安定性の危険を有することなく使用することができる。 According to the invention, the roll separation force is less than 50 kN / m. Such a small roll separation force because the composition of the steel melt according to the invention minimizes the occurrence of non-uniformity by the fact that it ensures that liquid non-metallic inclusions occur during solidification of the steel shell. Can be used without risking the stability of the casting process.
割れの頻度はロール離隔力の増加に伴って増加する。５０ｋＮ／ｍ以上のロール離隔力が使用される場合、殆ど割れ及び表面欠陥の無い鋼ストリップの均一な表面の生成を確実とすることはできない。 The frequency of cracking increases with increasing roll separation force. When roll separation forces of 50 kN / m or more are used, it is not possible to ensure the production of a uniform surface of the steel strip with almost no cracks and surface defects.
本発明によれば、ロール離隔力に対する下限は２ｋＮ／ｍである。鋳造プロセスの十分な安定性は、この値未満においては確実とはならない。 According to the invention, the lower limit for the roll separation force is 2 kN / m. Sufficient stability of the casting process is not assured below this value.
ロール離隔力は好ましくは少なくとも５ｋＮ／ｍである。ロール離隔力の上限は好ましくは３０ｋＮ／ｍである。 The roll separation force is preferably at least 5 kN / m. The upper limit of the roll separation force is preferably 30 kN / m.
ロール離隔力に対して上述された値は、鋳造設備の安定した通常状態を参照しているが、設備が始動するか、又は過剰な付加の効果が一時的に生じる場合の状況は参照していない。 The values given above for the roll separation force refer to the stable normal state of the casting equipment, but not to the situation when the equipment is started or excessive addition effects occur temporarily. Absent.
本発明によるプロセスのさらなる好ましい実施形態によれば、鋼溶融物中の非金属介在物は、４５重量％未満のＡｌ２Ｏ３の質量分率を有している。主成分ＭｎＯ−Ｓｉ０２−ＭｎＳ−Ａｌ２０３を有する結果的な多相システムは、主成分ＭｎＯとＳｉＯ２とからなる多相システムの溶融温度より低い。さらに、液状の非金属介在物が存在する組成範囲は、主成分ＭｎＯ−Ｓｉ０２−ＭｎＳ−Ａｌ２０３を有する多相システムにおいて、主成分ＭｎＯ及びＳｉＯ２からなる多相システムにおけるよりも広い。Ａｌ２Ｏ３濃度は鋼溶融物を生産するための開始材料の選択と、適切である場合には、Ａｌ又はＡｌ化合物の目標とした添加とによって設定される。 According to a further preferred embodiment of the process according to the invention, the nonmetallic inclusions in the steel melt have a mass fraction of Al 2 O 3 of less than 45% by weight. The resulting multiphase system with the main components MnO—SiO 2 —MnS—Al 2 0 3 is lower than the melting temperature of the multiphase system consisting of the main components MnO and SiO 2 . Moreover, the composition range nonmetallic inclusions liquid is present in the multiphase system with the main component MnO-Si0 2 -MnS-Al 2 0 3, wider than in the multiphase system comprising a main component MnO and SiO 2 . The Al 2 O 3 concentration is set by the choice of starting material for producing the steel melt and, where appropriate, the targeted addition of Al or Al compound.
Claims (4)
鋼溶融物が、少なくとも２つの鋳造ロールの間の溶湯貯蔵部から導入され、冷却されるとともに鋼ストリップとともに移動し、前記鋳造ロール上において少なくとも部分的に凝固して前記鋼ストリップを形成するプロセスにおいて、
前記鋼溶融物が、２０〜３００ｐｐｍの硫黄濃度と、３．５以上のＭｎ／Ｓｉ比とを有し、通常の操業中にロール離隔力が２〜５０ｋＮ／ｍであることを特徴とするプロセス。A process for producing a strip that is a cast low carbon concentration Mn / Si semi-killed steel strip comprising:
In a process where a steel melt is introduced from a melt reservoir between at least two casting rolls, cooled and moved with the steel strip, and at least partially solidified on the casting roll to form the steel strip. ,
The steel melt has a sulfur concentration of 20 to 300 ppm and a Mn / Si ratio of 3.5 or more, and a roll separation force of 2 to 50 kN / m during normal operation. .
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| AT0159306A AT504225B1 (en) | 2006-09-22 | 2006-09-22 | METHOD FOR PRODUCING A STEEL STRIP |
| ATA1593/2006 | 2006-09-22 | ||
| PCT/EP2007/007228 WO2008034502A1 (en) | 2006-09-22 | 2007-08-16 | Method for producing a steel strip |
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| JP3308102B2 (en) * | 1994-05-26 | 2002-07-29 | キャストリップ・リミテッド・ライアビリティ・カンパニー | Metal strip continuous casting method |
| AUPN281195A0 (en) * | 1995-05-05 | 1995-06-01 | Bhp Steel (Jla) Pty Limited | Casting steel strip |
| JPH09168844A (en) * | 1995-12-19 | 1997-06-30 | Mitsubishi Heavy Ind Ltd | Twin roll continuous casting method |
| JP3117638B2 (en) * | 1996-03-28 | 2000-12-18 | 新日本製鐵株式会社 | Continuous slab casting method |
| IT1291931B1 (en) * | 1997-06-19 | 1999-01-21 | Voest Alpine Ind Anlagen | PROCEDURE FOR THE PRODUCTION OF RAW STEEL CASTING TAPES WITH LOW CARBON CONTENT AND THIS OBTAINABLE TAPES |
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