JP4720640B2 - Continuous casting method - Google Patents
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本発明は、設備の制約等により二次冷却水量の上限が限られた条件下において、所定範囲内の二次冷却水量を適量に設定することで、バルジングを起こさずに、寸法精度のよい鋳片を高速鋳造することができる連続鋳造方法に関するものである。 The present invention sets the secondary cooling water amount within a predetermined range to an appropriate amount under conditions where the upper limit of the secondary cooling water amount is limited due to equipment restrictions, etc. The present invention relates to a continuous casting method capable of casting a piece at a high speed.
連続鋳造における生産性を向上するには、高速鋳造を行うのが一般的であるが、鋳造速度が速くなると連続鋳造機内で形成される鋳片の凝固シェル厚みが薄くなるので、バルジングにより鋳片の厚みや幅が変動しやすくなって寸法精度が悪くなる。製造する鋳片の寸法精度が悪くなると、製品の歩留りが悪化するだけでなく、圧延工程での負荷や品質不良の増大にも繋がる。 In order to improve productivity in continuous casting, high-speed casting is generally performed. However, as the casting speed increases, the thickness of the solidified shell of the slab formed in the continuous casting machine becomes thin. The thickness and width of the film are likely to fluctuate, resulting in poor dimensional accuracy. When the dimensional accuracy of the slab to be manufactured is deteriorated, not only the yield of the product is deteriorated, but also the load in the rolling process and the quality defect are increased.
そこで、特許文献１では、鋳型出側から鋳造方向に３mまでの間における二次冷却水量を、全二次冷却水量の５０〜６０質量％で、かつ鋳片の両側長辺の単位面積当たりの水量密度が、３００〜５００リットル／m2・minで高速鋳造する方法が開示されている。そして、この方法により、高速鋳造時におこるバルジングによって発生する鋳型内溶鋼の周期的な湯面レベル変動、すなわちバルジングを防止することができるとしている。
しかしながら、特許文献１に開示された方法のように、鋳型出側から鋳造方向に３mの短い範囲内で、３００〜５００リットル／m2・minもの多量の冷却水を噴霧すると、本発明が対象とする二次冷却帯の比水量が２．０リットル／kg−steel以下の場合には、鋳片表面の冷却のバラツキが大きくなって、表面疵が発生し易くなるという問題があった。 However, as in the method disclosed in Patent Document 1, spraying a large amount of 300 to 500 liters / m 2 · min of cooling water within a short range of 3 m in the casting direction from the mold exit side, the present invention is an object. When the specific water amount in the secondary cooling zone is 2.0 liters / kg-steel or less, there is a problem that the variation in cooling of the slab surface increases and surface flaws are likely to occur.
本発明が解決しようとする問題点は、従来の高速連続鋳造は、設備の制約等によって二次冷却水量の上限が限られた条件下においては、鋳片表面の冷却のバラツキが大きくなって、表面疵が発生し易くなるという点である。 The problem to be solved by the present invention is that the conventional high-speed continuous casting has a large variation in cooling of the surface of the slab under the condition that the upper limit of the amount of secondary cooling water is limited due to equipment restrictions, etc. That is, surface flaws are likely to occur.
本発明の連続鋳造方法は、
設備の制約等により二次冷却水量の上限が限られた条件下において、バルジングを起こさずに、寸法精度のよい鋳片を高速鋳造する際、鋳片表面の冷却のバラツキが大きくなって、表面疵が発生し易くなるということを防止するために、
二次冷却帯の比水量が２．０リットル／kg−steel以下の連続鋳造機を用いてスラブ鋳片を鋳造する際に、メニスカスから鋳造方向下流側に５mの範囲内におけるスラブ鋳片の二次冷却を、二次冷却に用いる全水量の５０質量％以上の水量で行う連続鋳造方法において、
前記スラブ鋳片の二次冷却を、
スラブ鋳片の両側長辺の単位面積当たりの水量密度が、２００リットル／m 2 ・min以上、３００リットル／m 2 ・min未満で行うことを最も主要な特徴としている。
The continuous casting method of the present invention comprises:
When high-speed casting of slabs with good dimensional accuracy without causing bulging under conditions where the upper limit of the secondary cooling water amount is limited due to equipment restrictions, etc. In order to prevent the occurrence of wrinkles,
When casting a slab slab using a continuous casting machine having a specific water volume of 2.0 liters / kg-steel or less in the secondary cooling zone, the second slab slab in the range of 5 m from the meniscus to the downstream side in the casting direction. In the continuous casting method in which the secondary cooling is performed with a water amount of 50% by mass or more of the total water amount used for the secondary cooling ,
Secondary cooling of the slab slab,
The most important feature is that the density of water per unit area on both long sides of the slab slab is 200 liters / m 2 · min or more and less than 300 liters / m 2 · min .
本発明によれば、設備の制約等により二次冷却水量の上限が限られた条件下において、新たな設備投資を必要とせず、簡便に、バルジングを起こさず、寸法精度のよい鋳片を高速鋳造することができる。そして、その際、鋳片表面の冷却のバラツキが大きくなって、表面疵が発生し易くなるということもない。 According to the present invention, under conditions where the upper limit of the amount of secondary cooling water is limited due to equipment restrictions, etc., a new equipment investment is not required, and a slab with high dimensional accuracy is easily produced without causing bulging. Can be cast. And at that time, the variation in cooling of the slab surface does not increase, and surface flaws are not easily generated.
以下、本発明を実施するための最良の形態について詳細に説明する。
先に述べた通り、鋳造速度が増加すると連続鋳造機内で形成される凝固シェルの厚さが薄くなるので、バルジングが発生して寸法精度が悪くなる。バルジングは凝固シェルに溶鋼静圧が作用することで発生するので、鋳型通過後の鋳片に噴霧する二次冷却水量を増加させて凝固シェルの厚さを厚くすると、溶鋼静圧に対する抵抗が増してバルジングを抑制することが可能になる。
Hereinafter, the best mode for carrying out the present invention will be described in detail.
As described above, when the casting speed is increased, the thickness of the solidified shell formed in the continuous casting machine is reduced, so that bulging occurs and the dimensional accuracy is deteriorated. Since bulging is caused by the action of the molten steel static pressure on the solidified shell, increasing the amount of secondary cooling water sprayed on the slab after passing through the mold to increase the thickness of the solidified shell increases the resistance to the molten steel static pressure. This makes it possible to suppress bulging.
しかしながら、二次冷却の設備能力には限りがあるために、鋳型通過後の鋳片に噴霧する二次冷却水量として、設備能力以上の水量を使用することはできない。 However, since the facility capacity of secondary cooling is limited, the amount of water exceeding the facility capacity cannot be used as the amount of secondary cooling water sprayed on the slab after passing through the mold.
そこで、本発明の連続鋳造方法は、
二次冷却帯の比水量が２．０リットル／kg−steel以下の連続鋳造機を用いてスラブ鋳片を鋳造する際に、メニスカスから鋳造方向下流側に５mの範囲内におけるスラブ鋳片の二次冷却を、二次冷却に用いる全水量の５０質量％以上の水量で行う連続鋳造方法において、
前記スラブ鋳片の二次冷却を、
スラブ鋳片の両側長辺の単位面積当たりの水量密度が、２００リットル／m2・min以上、３００リットル／m2・min未満で行うことにしている。
Therefore, the continuous casting method of the present invention is
When casting a slab slab using a continuous casting machine having a specific water volume of 2.0 liters / kg-steel or less in the secondary cooling zone, the second slab slab in the range of 5 m from the meniscus to the downstream side in the casting direction. In the continuous casting method in which the secondary cooling is performed with a water amount of 50% by mass or more of the total water amount used for the secondary cooling,
Secondary cooling of the slab slab,
The water density per unit area on both long sides of the slab slab is 200 liter / m 2 · min or more and less than 300 liter / m 2 · min.
すなわち、本発明の連続鋳造方法は、設備能力の制約により二次冷却水量の上限が２．０リットル／kg−steelに限られた条件下でも、鋳型通過直後の凝固シェル厚さを厚くして、バルジングを起こさずに高速鋳造することを目的とするもので、その際、表面疵の発生をも防止するようにしている。 That is, the continuous casting method of the present invention increases the thickness of the solidified shell immediately after passing through the mold even under the condition where the upper limit of the secondary cooling water amount is limited to 2.0 liters / kg-steel due to restrictions on equipment capacity. The purpose is to perform high speed casting without causing bulging, and at this time, generation of surface flaws is also prevented.
本発明の連続鋳造方法で対象とする二次冷却設備の比水量の下限は、１．０リットル／kg−steelである。その理由は、二次冷却設備の比水量が１．０リットル／kg−steel未満の場合には、二次冷却の効果が少なくなり、連続鋳造機の機端で凝固が完了しない場合があるからである。 The lower limit of the specific water amount of the secondary cooling equipment targeted by the continuous casting method of the present invention is 1.0 liter / kg-steel. The reason is that when the specific water amount of the secondary cooling equipment is less than 1.0 liter / kg-steel, the effect of the secondary cooling is reduced and solidification may not be completed at the end of the continuous casting machine. It is.
つまり、本発明の連続鋳造方法は、二次冷却水量が限られた連続鋳造機において、二次冷却水量をメニスカスから鋳造方向下流側に５mの範囲内に集中させて、鋳型通過直後の凝固シェル厚さが薄い領域にて強冷却することで、凝固シェルの厚さを早期に確保するのである。 That is, in the continuous casting method of the present invention, in a continuous casting machine with a limited amount of secondary cooling water, the amount of secondary cooling water is concentrated within a range of 5 m downstream from the meniscus in the casting direction, and the solidified shell immediately after passing through the mold. By vigorously cooling in the thin region, the thickness of the solidified shell is secured early.
そのため、溶鋼静圧が高くなる鋳造下流側における凝固シェルの変形抵抗が大きくなり、短辺バルジングや鋳片幅広がりを起こすことなく高速鋳造することが可能になる。そして、その際、鋳片表面の冷却のバラツキが大きくなって、表面疵が発生し易くなるということも防止できる。
これが本発明の狙いである。
For this reason, the deformation resistance of the solidified shell on the downstream side of the casting where the molten steel static pressure increases is increased, and high-speed casting can be performed without causing short-side bulging or slab width expansion. At that time, it is also possible to prevent the surface of the slab from becoming more uneven and causing surface flaws.
This is the aim of the present invention.
本発明の連続鋳造方法において、二次冷却を強冷却とする範囲を、メニスカスから５mの範囲内とする理由は、たとえばメニスカスから３mの範囲内などのように、メニスカスからの距離が短いと、鋳片表面に多量の二次冷却水が短時間に噴霧されるので、鋳片表面の冷却のバラツキが大きくなって、鋳片に表面疵が発生し易くなるからである。反対に強冷却する範囲が５mを超える場合は、凝固シェルを厚くして短辺面のバルジングを抑制することが困難である。 In the continuous casting method of the present invention, the reason for making the secondary cooling strong cooling within the range of 5 m from the meniscus is, for example, when the distance from the meniscus is short, such as within the range of 3 m from the meniscus, This is because a large amount of secondary cooling water is sprayed on the surface of the slab in a short time, so that the variation in cooling of the surface of the slab becomes large and surface flaws are likely to occur on the slab. On the contrary, when the strong cooling range exceeds 5 m, it is difficult to suppress the bulging of the short side surface by thickening the solidified shell.
また、本発明の連続鋳造方法において、二次冷却に用いる全水量の５０質量％以上の水量で行うのは、比水量が２．０リットル／kg−steel以下の二次冷却帯の場合、５０質量％未満の冷却水量では、凝固シェルを厚くして、短辺面のバルジングを抑制する効果が発揮できないからである。従って、５０質量％以上であれば、二次冷却水の全量（１００質量％）をこの領域で噴霧してもよい。 In the continuous casting method of the present invention, the amount of water of 50% by mass or more of the total amount of water used for secondary cooling is 50% in the case of a secondary cooling zone with a specific water amount of 2.0 liters / kg-steel or less. This is because if the amount of cooling water is less than mass%, the effect of suppressing the bulging of the short side surface by thickening the solidified shell cannot be exhibited. Therefore, if it is 50 mass% or more, you may spray the whole quantity (100 mass%) of secondary cooling water in this area | region.
発明者の実験によれば、スラブ鋳片の両側長辺の単位面積当たりの水量密度が、２００リットル／m2・min以上、３００リットル／m2・min未満で行った場合には、バルジングを起こさず、寸法精度のよい鋳片を高速鋳造した際にも、鋳片表面の冷却のバラツキがなく、表面疵が発生することもなかった。 According to the inventor's experiment, when the water density per unit area on both long sides of the slab slab is 200 liter / m 2 · min or more and less than 300 liter / m 2 · min, bulging is performed. Even when a slab having high dimensional accuracy was cast at a high speed, there was no variation in cooling of the slab surface and no surface flaws were generated.
以下、本発明の連続鋳造方法の効果を確認するために行った実験結果について説明する。
実験は、二次冷却帯の比水量が１．８リットル／kg−steelの、垂直曲げ型の連続鋳造機を用いて、炭素含有量が０．０２〜０．０７質量％の低炭素鋼を、厚さが２３０mm、幅が１２５０mmのスラブ鋳片に、１３００mm／minの鋳造速度で鋳造することにより行った。
Hereinafter, experimental results performed to confirm the effects of the continuous casting method of the present invention will be described.
The experiment was conducted using a vertical bend type continuous casting machine with a specific water volume of 1.8 liters / kg-steel in the secondary cooling zone and a low carbon steel with a carbon content of 0.02 to 0.07 mass%. The slab slab having a thickness of 230 mm and a width of 1250 mm was cast at a casting speed of 1300 mm / min.
発明例では、メニスカスから鋳造方向下流側に５mの範囲内におけるスラブ鋳片の二次冷却を、二次冷却に用いる全水量の５１．４質量％の水量（スラブ鋳片の両側長辺の単位面積当たりの水量密度が、２１４リットル／m2・min）で行った。 In the example of the invention, the secondary cooling of the slab slab in the range of 5 m downstream from the meniscus is 51.4% by mass of the total amount of water used for the secondary cooling (unit of long sides on both sides of the slab slab). The water density per area was 214 liters / m 2 · min).
一方、比較として実施した従来例では、メニスカスから鋳造方向下流側に５mの範囲内におけるスラブ鋳片の二次冷却を、二次冷却に用いる全水量の４０．８質量％の水量（スラブ鋳片の両側長辺の単位面積当たりの水量密度が、１７０リットル／m2・min）で行った。 On the other hand, in the conventional example carried out as a comparison, the secondary cooling of the slab slab within a range of 5 m downstream from the meniscus is 40.8% by mass of the total amount of water used for the secondary cooling (slab slab water flow rate per unit area of each side long side of, was performed in 170 l / m 2 · min).
前記した発明例と従来例の鋳造条件を下記表１に示す。また、噴霧された二次冷却スプレーの総水量密度と、メニスカスからの距離の関係を図１に示す。
The casting conditions of the above-described invention examples and conventional examples are shown in Table 1 below. FIG. 1 shows the relationship between the total water density of the sprayed secondary cooling spray and the distance from the meniscus.
前記の条件で連続鋳造したスラブ鋳片の幅の膨張率（鋳片長辺上端面または下端面の幅に対して、厚み中心部の鋳片幅の増加代）を調査した結果を図２に示すが、連続鋳造機内の上流側の二次冷却水量を増量した発明例では、スラブ幅の膨張率を従来例の２．５％から１．５％に抑制することができた。また、発明例では、表面疵の発生もなかった。 The result of investigating the expansion coefficient of the width of the slab slab continuously cast under the above conditions (increase in the slab width at the center of the thickness relative to the width of the upper end surface or lower end surface of the long side of the slab) is shown in FIG. However, in the invention example in which the amount of secondary cooling water on the upstream side in the continuous casting machine was increased, the expansion coefficient of the slab width could be suppressed from 2.5% of the conventional example to 1.5%. Further, in the inventive examples, there was no surface flaws.
本発明は上記の例に限らず、各請求項に記載された技術的思想の範疇内で、適宜実施の形態を変更しても良いことは言うまでもない。 The present invention is not limited to the above example, and it goes without saying that the embodiment may be appropriately changed within the scope of the technical idea described in each claim.
本発明は、実施例に示したような低炭素鋼鋳片のみならず中炭素鋼鋳片や高炭素鋼鋳片の連続鋳造にも適用できる。また、ピンチロールでの鋳片矯正が無い垂直型の連続鋳造機においても、適用可能である。 The present invention can be applied not only to low carbon steel slabs as shown in the examples but also to continuous casting of medium carbon steel slabs and high carbon steel slabs. Further, the present invention can also be applied to a vertical continuous casting machine without slab correction with a pinch roll.
Claims (1)
前記スラブ鋳片の二次冷却を、
スラブ鋳片の両側長辺の単位面積当たりの水量密度が、２００リットル／m 2 ・min以上、３００リットル／m 2 ・min未満で行うことを特徴とする連続鋳造方法。 When casting a slab slab using a continuous casting machine having a specific water volume of 2.0 liters / kg-steel or less in the secondary cooling zone, the second slab slab in the range of 5 m from the meniscus to the downstream side in the casting direction. In the continuous casting method in which the secondary cooling is performed with a water amount of 50% by mass or more of the total water amount used for the secondary cooling ,
Secondary cooling of the slab slab,
A continuous casting method, wherein the density of water per unit area on both long sides of a slab slab is 200 liters / m 2 · min or more and less than 300 liters / m 2 · min .
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| JP2002086252A (en) * | 2000-09-12 | 2002-03-26 | Sumitomo Metal Ind Ltd | Continous casting method |
| JP2002307148A (en) * | 2001-04-09 | 2002-10-22 | Sumitomo Metal Ind Ltd | Apparatus for continuously casting steel and continuous casting method |
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| JP2001191158A (en) * | 1999-12-28 | 2001-07-17 | Sumitomo Metal Ind Ltd | Continuous casting method of steel |
| JP2002086252A (en) * | 2000-09-12 | 2002-03-26 | Sumitomo Metal Ind Ltd | Continous casting method |
| JP2002307148A (en) * | 2001-04-09 | 2002-10-22 | Sumitomo Metal Ind Ltd | Apparatus for continuously casting steel and continuous casting method |
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